Latent heat thermal energy storage(TES)effectively reduces the mismatch between energy supply and demand of renewable energy sources by the utilization of phase change materials(PCMs).However,the low thermal conductiv...Latent heat thermal energy storage(TES)effectively reduces the mismatch between energy supply and demand of renewable energy sources by the utilization of phase change materials(PCMs).However,the low thermal conductivity and poor shape stability are the main drawbacks in realizing the large-scale application of PCMs.Promisingly,developing composite PCM(CPCM)based on porous supporting mate-rial provides a desirable solution to obtain performance-enhanced PCMs with improved effective thermal conductivity and shape stability.Among all the porous matrixes as supports for PCM,three-dimensional carbon-based porous supporting material has attracted considerable attention ascribing to its high ther-mal conductivity,desirable loading capacity of PCMs,and excellent chemical compatibility with various PCMs.Therefore,this work systemically reviews the CPCMs with three-dimensional carbon-based porous supporting materials.First,a concise rule for the fabrication of CPCMs is illustrated in detail.Next,the experimental and computational research of carbon nanotube-based support,graphene-based support,graphite-based support and amorphous carbon-based support are reviewed.Then,the applications of the shape-stabilized CPCMs including thermal management and thermal conversion are illustrated.Last but not least,the challenges and prospects of the CPCMs are discussed.To conclude,introducing carbon-based porous materials can solve the liquid leakage issue and essentially improve the thermal conductivity of PCMs.However,there is still a long way to further develop a desirable CPCM with higher latent heat capacity,higher thermal conductivity,and more excellent shape stability.展开更多
High-temperature phase change materials(PCMs)have attracted significant attention in the field of thermal energy storage due to their ability to store and release large amounts of heat within a small temperature fluct...High-temperature phase change materials(PCMs)have attracted significant attention in the field of thermal energy storage due to their ability to store and release large amounts of heat within a small temperature fluctuation range.However,their practical application is limited due to problems such as leakage,corrosion,and volume changes at high temperatures.Recent research has shown that macroencapsulation technology holds promise in addressing these issues.This paper focuses on the macroencapsulation technology of high-temperature PCMs,starting with a review of the classification and development history of high-temperature macroencapsulatd PCMs.Four major encapsulation strategies,including electroplating method,solid/liquid filling method,sacrificial material method,and powder compaction into sphere method,are then summarized.The methods for effectively addressing issues such as corrosion,leakage,supercooling,and phase separation in PCMs are analyzed,along with approaches for improving the heat transfer performance,mechanical strength,and thermal cycling stability of macrocapsules.Subsequently,the structure and packing arrangement optimization of macrocapsules in thermal storage systems is discussed in detail.Finally,after comparing the performance of various encapsulation strategies and summarizing existing issues,the current technical challenges,improvement methods,and future development directions are proposed.More attention should be given to utilizing AI technology and reinforcement learning to reveal the multiphysics-coupled heat and mass transfer mechanisms in macrocapsule applications,as well as to optimize material selection and encapsulation parameters,thereby enhancing the overall efficiency of thermal storage systems.展开更多
We adopted the solution impregnation route with aluminum dihydrogen phosphate solution as liquid medium for effective surface modification on graphite substrate.The mass ratio of graphite to Al(H_(2)PO_(4))_(3) change...We adopted the solution impregnation route with aluminum dihydrogen phosphate solution as liquid medium for effective surface modification on graphite substrate.The mass ratio of graphite to Al(H_(2)PO_(4))_(3) changed from 0.5:1 to 4:1,and the impregnation time changed from 1 to 7 h.The typical composite phase change thermal storage materials doped with the as-treated graphite were fabricated using form-stable technique.To investigate the oxidation and anti-oxidation behavior of the impregnated graphite at high temperatures,the samples were put into a muffle furnace for a cyclic heat test.Based on SEM,EDS,DSC techniques,analyses on the impregnated technique suggested an optimized processing conditions of a 3 h impregnation time with the ratio of graphite:Al(H_(2)PO_(4))_(3) as 1:3 for graphite impregnation treatment.Further investigations on high-temperature phase change heat storage materials doped by the treated graphite suggested excellent oxidation resistance and thermal cycling performance.展开更多
The urgent demand for renewable energy solutions,propelled by the global energy crisis and environmental concerns,has spurred the creation of innovative materials for solar thermal storage.Photothermal phase change ma...The urgent demand for renewable energy solutions,propelled by the global energy crisis and environmental concerns,has spurred the creation of innovative materials for solar thermal storage.Photothermal phase change materials(PTPCMs)represent a novel type of composite phase change material(PCM)aimed at improving thermal storage efficiency by incorporating photothermal materials into traditional PCMs and encapsulating them within porous structures.Various porous encapsulation materials have been studied,including porous carbon,expanded graphite,and ceramics,but issues like brittleness hinder their practical use.To overcome these limitations,flexible PTPCMs using organic porous polymers—like foams,hydrogels,and porous wood—have emerged,offering high porosity and lightweight characteristics.This review examines recent advancements in the preparation of PTPCMs based on porous polymer supports through techniques like impregnation and in situ polymerization,assessing the impact of different porous polymer materials on PCM performance and clarifying the mechanisms of photothermal conversion and heat storage.Subsequently,the most recent advancements in the applications of porous polymer-based PTPCMs are systematically summarized,and future research challenges and possible solutions are discussed.This review aims to foster awareness about the potential of PTPCMs in promoting environmentally friendly energy practices and catalyzing further research in this promising field.展开更多
Oriented graphene aerogels have limited applica-tions because the flexibility of their graphene sheets and mi-crostructure give them a low skeleton strength,insufficient compression resilience,and poor flexibility.We ...Oriented graphene aerogels have limited applica-tions because the flexibility of their graphene sheets and mi-crostructure give them a low skeleton strength,insufficient compression resilience,and poor flexibility.We report the preparation of novel aerogel materials with a much better per-formance.Using the driving force of graphene oxide(GO)self-assembly andπ-πinteractions,carbon nanotubes(CNTs)were attached to the GO sheets,and an oriented composite carbon skeleton was constructed using“hydro-plastic foam-ing”.The introduction of CNTs significantly increased the strength of the skeleton and gave the aerogel an excellent re-versible compressibility.The innovative use of cold pressing greatly improved the thermal conductivity and flexibility of the aerogel,providing new ideas for the development of high-performance aerogels.Tests show that the obtained graphene composite aerogel has a reversible compressive strain of over 90%and can withstand 500 compression cycles along the direc-tion of pore accumulation.It can endure more than 10000 bending cycles perpendicular to the direction of composite carbon layer stacking,and its in-plane thermal conductivity reaches 64.5 W·m^(-1)·K^(-1).When filled with phase change materials,the high porosity of the carbon skeleton enables the material to have a high phase change filling rate,and its phase change enthalpy is greater than 150 J/g.Thanks to the exceptional flexibility of the carbon skeleton,the macrostructure of phase change materials can be bent as needed to adapt to thermal management scenarios and conform to device shapes.This significantly enhances practical application compatibility,providing flexible support for temperature control and thermal management across diverse device forms.展开更多
Using periodic refractive index perturbations,the Brillouin zone is folded,transforming the guided modes in a metasurface into guided resonances with arbitrarily high quality-factors.The incorporation of phase change ...Using periodic refractive index perturbations,the Brillouin zone is folded,transforming the guided modes in a metasurface into guided resonances with arbitrarily high quality-factors.The incorporation of phase change materials within the metasurface enables dynamic modulation of the guided modes.The system’s symmetry ensures a polarization-independent response under normal incidence.Furthermore,the metasurface exhibits excellent sensing performance,demonstrating its potential for advanced photonic applications.展开更多
With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensur...With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensure human thermal comfort in extreme environments. Biomimetic structures have emerged as a novel source of inspiration for PTM applications. This review systematically summarizes the biomimetic structures, phase change materials, manufacturing methods, and the performance of multifunctional PTM wearables. Firstly, it analyzes the biomimetic structures with thermal regulation and encapsulated phase change material functionalities from different dimensions, highlighting their applications in PTM. Subsequently, it outlines the conventional manufacturing methods incorporating various biomimetic structures, offering strategies for the production of PTM wearables. The review also discusses the typical performance characteristics of multifunctional PTM wearables, addressing the current demands in thermal management. Finally, opportunities and challenges in PTM field are proposed, proposing new directions for future research.展开更多
Latent heat thermal energy storage(LHTES)is an attractive method for enhancing the functionality and availability of renew-able energy sources,and it is extensively used to support concentrated solar power technologie...Latent heat thermal energy storage(LHTES)is an attractive method for enhancing the functionality and availability of renew-able energy sources,and it is extensively used to support concentrated solar power technologies.The main feature of every LHTES sys-tem is a phase change material(PCM),i.e.,a substance used to absorb/release energy upon cyclic melting/solidification.This study in-vestigates the potential of ferro-alloys as high-performance PCM candidates,targeting energy storage capacities exceeding 1 MWh·m^(−3),and operational temperatures above 1000°C.A thermodynamic assessment of binary and ternary Fe-based systems,alloyed with Si,B,Cr,V,and Ti,was conducted to identify compositions with optimal phase transition characteristics and heat storage potential.The results highlight the significant potential of the Fe-Si-B system,where boron’s exceptionally high latent heat enhances energy storage capacity despite challenges posed by its high melting point and cost.The Fe-Si-Cr system revealed promising alloys,such as Fe-34Si-38Cr and Fe-34Si-43Cr,offering excellent energy storage density and favorable phase transition temperatures.In the Fe-Si-V system,vanadium additions produced alloys like Fe-36Si-14V and Fe-34Si-10V,which meet energy storage criteria,although the high melting points of some Si-V phases may restrict their practical applicability.The Fe-Si-Ti system showed standout compositions,including Fe-38Si-20Ti and Si-48Ti,achieving energy storage capacities of approximately 1.5 MWh·m^(−3).This study compares ferro-alloy PCMs against state-of-the-art metallic PCMs,highlighting the performance of certain ferro-alloys.展开更多
Solar-thermoelectric generators(STEGs)capable of harnessing solar energy for conversion into clean electricity are pivotal for advancing towards carbon neutrality.The integration of phase change materials(PCMs)with ST...Solar-thermoelectric generators(STEGs)capable of harnessing solar energy for conversion into clean electricity are pivotal for advancing towards carbon neutrality.The integration of phase change materials(PCMs)with STEGs facilitates power generation regardless of solar radiation flux due to their robust thermal management capacity.However,the inherent solar-thermal conversion efficiency limitation of PCMs hinders the production of high and sustained electrical output.Herein,a multidimensional engineering strategy is proposed to align two-dimensional(2D)molybdenum disulfide(MoS_(2))nanosheets vertically in situ on a dodecahedron composed of zero-dimensional(OD)Co nanoparticles and three-dimensional(3D)high graphitized carbon derived from ZIF-67,thus significantly boosting the solar-thermoelectric energy generation of polyethylene glycol(PEG).The resultant PEG-Co/C@MoS_(2)composite PCMs exhibit a high solar-thermal conversion efficiency of 92.89%,benefiting from the synergy of multiple components and unique structural arrangements.When coupled with thermoelectric devices,this powerful STEG yields a high and durable output voltage of 197.51 mV and a current of 52.47 mA under 100 mW cm^(−2),outperforming the majority of previously reported literature.This PCM-integrated solar-thermoelectric generator overcomes limitations associated with temporal and meteorological variations,enabling simultaneous high-density heat and electricity generation for energy conservation and environmental sustainability.展开更多
Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials...Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials(PCMs).Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems,enabling PCMs to perform unprecedented functions(such as green energy utilization,magnetic thermotherapy,drug release,etc.).The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite PCMs.However,a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still missing.Herein,we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite PCMs.We delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions,meticulously scrutinizing the intricate interplay between their architectures and thermophysical attributes.Moreover,we prognosticate future research trajectories,delineate alternative stratagems,and illuminate prospective avenues.This review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.展开更多
Investigating thermal transport mechanisms at the interface between phase change materials(PCMs)and high thermally conductive fillers has become increasingly significant in developing phase change energy storage techn...Investigating thermal transport mechanisms at the interface between phase change materials(PCMs)and high thermally conductive fillers has become increasingly significant in developing phase change energy storage technologies.This study explores the interfacial thermal transport between a representative PCM,erythritol,and various fillers,including crystalline(Si C,Si_(3)N_(4))and amorphous(Si O_(2))nanoparticles,using molecular dynamics(MD)simulations.Additionally,time-domain thermoreflectance(TDTR)experiments were performed to quantify the interfacial thermal conductance between erythritol and the three types of fillers,yielding values of 50.1,40.0,and25.6 MW m^(–2)K^(-1).These results align well with the trends observed in the simulations.Furthermore,the underlying mechanisms of interfacial heat transfer were analyzed by examining the phonon density of states,overlap energy,and interaction energy.This research provides innovative insights into nanoscale interfacial thermal transport in composite PCMs.This could lead to significant advancements in thermal management technologies,particularly in developing more efficient thermal energy storage systems.展开更多
Refrigeration systems are essential across various sectors,including food preservation,medical storage,and climate control.However,their high energy consumption and environmental impact necessitate innovative solution...Refrigeration systems are essential across various sectors,including food preservation,medical storage,and climate control.However,their high energy consumption and environmental impact necessitate innovative solutions to enhance efficiency while minimizing energy usage.This paper investigates the integration of Phase Change Materials(PCMs)into a vapor compression refrigeration system to enhance energy efficiency and temperature regulation for food preservation.A multifunctional prototype was tested under two configurations:(1)a standard thermally insulated room,and(2)the same room augmented with eutectic plates filled with either Glaceol(-10℃ melting point)or distilled water(0℃ melting point).Thermocouples were calibrated and deployed to record air and PCM temperatures during freeze–thaw cycles at thermostat setpoints of and Additionally,a-30℃ -35℃ .defrosting resistor and timer were added to mitigate frost buildup,a known cause of efficiency loss.The experimental results show that PCM-enhanced rooms achieved up to 10.98℃ greater temperature stability during defrost cycles and reduced energy consumption by as much as 7.76%(from 0.4584 to 0.4231 kWh/h).Moreover,the effectiveness of PCMs depended strongly on thermostat settings and PCM type,with distilled water demonstrating broader solidification across plates under higher ambient loads.These findings highlight the potential of PCM integration to improve cold-chain performance,offering rapid cooling,moisture retention,and extended product conservation during power interruptions.展开更多
Thermal runaway(TR)is considered a significant safety hazard for lithium batteries,and thermal protection materials are crucial in mitigating this risk.However,current thermal protection materials generally suffer fro...Thermal runaway(TR)is considered a significant safety hazard for lithium batteries,and thermal protection materials are crucial in mitigating this risk.However,current thermal protection materials generally suffer from poor mechanical properties,flammability,leakage,and rigid crystallization,and they struggle to continuously block excess heat transfer and propagation once thermal saturation occurs.This study proposes a novel type of thermal protection material:an aerogel coupled composite phase change material(CPCM).The composite material consists of gelatin/sodium alginate(Ge/SA)composite biomass aerogel as an insulating component and a thermally induced flexible CPCM made from thermoplastic polyester elastomer as a heat-absorbing component.Inspired by power bank,we coupled the aerogel with CPCM through the binder,so that CPCM can continue to‘charge and store energy’for the aerogel,effectively absorbing heat,delaying the heat saturation phenomenon,and maximizing the duration of thermal insulation.The results demonstrate that the Ge/SA aerogel exhibits excellent thermal insulation(with a temperature difference of approximately 120℃ across a 1 cm thickness)and flame retardancy(achieving a V-0 flame retardant rating).The CPCM exhibits high heat storage density(811.9 J g^(−1)),good thermally induced flexibility(bendable above 40℃),and thermal stability.Furthermore,the Ge/SA-CPCM coupled composite material shows even more outstanding thermal insulation performance,with the top surface temperature remaining at 89℃ after 100 min of exposure to a high temperature of 230℃.This study provides a new direction for the development of TR protection materials for lithium batteries.展开更多
We propose a novel approach for investigating the tunable Goos–H?nchen(GH)shift via an all-dielectric metasurface that incorporates phase change materials(PCMs).By introducing material asymmetry through the reconfigu...We propose a novel approach for investigating the tunable Goos–H?nchen(GH)shift via an all-dielectric metasurface that incorporates phase change materials(PCMs).By introducing material asymmetry through the reconfigurable characteristic of PCMs while maintaining fixed geometric parameters,we can achieve tunable dual quasi-bound states in the continuum with ultrahigh quality factors(Q factors).Enabled by such tunable dual modes with significant phase changes,the PCM-based metasurface exhibits giant-tunable bidirectional GH shifts compared to conventional metasurfaces.Notably,the GH shift exhibits multidimensional tunability,including PCM-driven switching(amorphous to crystalline),incident-angle dependence(θ),and wavelength selectivity(λ).The maximum observed shift reaches approximately 104 wavelengths,accompanied by a corresponding Q factor of 107.Our work demonstrates its potential for applications in ultrahigh-precision multifunctional devices,from biosensing to reconfigurable nanophotonic switches.展开更多
This study begins by exploring the typical practical applications of phase‐change materials(PCMs)in various industries,highlighting their importance in energy storage,temperature regulation,and thermal management.It ...This study begins by exploring the typical practical applications of phase‐change materials(PCMs)in various industries,highlighting their importance in energy storage,temperature regulation,and thermal management.It then emphasizes the necessity of flame‐retardant functionalization tailored to the specific application scenarios of PCMs,especially considering their use in safety‐critical environments such as electronics,automotive,and construction.The classic characterization methods for assessing the flame‐retardant properties of PCM are introduced in detail,including the limiting oxygen index,the vertical burning test,and the cone calorimeter,which are widely recognized standards in material safety testing.Additionally,newly developed methods for evaluating combustion safety are discussed,such as direct combustion tests,candle combustion experiments,and back temperature response,which offer a more comprehensive understanding of the material's fire resistance.Following this,this study provides a thorough summary and categorization of the flame‐retardant strategies used in PCMs,divided into four main approaches:(1)incorporation of external flame retardants,(2)use of flame‐retardant microcapsules,(3)development of flame‐retardant support materials,and(4)creation of intrinsic flame‐retardant PCMs.Each strategy is critically analyzed in terms of effectiveness,applicability,and potential challenges.Lastly,the conclusion provides an overview of the current state of flame‐retardant PCMs,offering insights into future development directions,including the pursuit of more sustainable and efficient flame‐retardant solutions,as well as prospects for their broader adoption in various industries.展开更多
In order to address the synergistic optimization of energy efficiency improvement in the waste incineration power plant(WIPP)and renewable energy accommodation,an electricity-hydrogen-waste multi-energy system integra...In order to address the synergistic optimization of energy efficiency improvement in the waste incineration power plant(WIPP)and renewable energy accommodation,an electricity-hydrogen-waste multi-energy system integrated with phase change material(PCM)thermal storage is proposed.First,a thermal energy management framework is constructed,combining PCM thermal storage with the alkaline electrolyzer(AE)waste heat recovery and the heat pump(HP),while establishing a PCM-driven waste drying system to enhance the efficiency of waste incineration power generation.Next,a flue gas treatment method based on purification-separation-storage coordination is adopted,achieving spatiotemporal decoupling between waste incineration and flue gas treatment.Subsequently,a two-stage optimal dispatching strategy for the multi-energy system is developed:the first stage establishes a dayahead economic dispatch model with the objective of minimizing net system costs,while the second stage introduces model predictive control(MPC)to realize intraday rolling optimization.Finally,The optimal dispatching strategies under different scenarios are obtained using the Gurobi solver,followed by a comparative analysis of the optimized operational outcomes.Simulation results demonstrate that the proposed system optimizes the output and operational states of each unit,simultaneously reducing carbon trading costs while increasing electricity sales revenue.The proposed scheduling strategy demonstrates effective grid peak-shaving functionality,thereby simultaneously improving the system’s economic performance and operational flexibility while providing an innovative technical pathway for municipal solid waste(MSW)resource utilization and low-carbon transformation of energy systems.展开更多
Phase change thermal interface materials(PC-TIMs)have emerged as a promising solution to address the increasing thermal management challenges in electronic devices.This is attributed to their dual mechanisms of latent...Phase change thermal interface materials(PC-TIMs)have emerged as a promising solution to address the increasing thermal management challenges in electronic devices.This is attributed to their dual mechanisms of latent heat absorption and phase change-induced interfacial wettability.This review explores the fundamental principles,material innovations,and diverse applications of PC-TIMs.The heat transfer enhancement mechanisms are first underlined with key factors such as thermal carrier mismatch at the microscale and contact geometry at the macroscale,emphasizing the importance of material selection and design for optimizing thermal performance.Section 2 focuses on corresponding experimental approaches provided,including intrinsic thermal conductivity improvements and interfacial heat transfer optimization.Section 3 discusses common methods such as physical adsorption via porous materials,chain-crosslinked network designs,and core-shell structures,and their effects on leakage prevention,heat transfer enhancement,and application flexibility.Furthermore,the extended applications of PC-TIMs in thermal energy storage are explored in Section 4,suggesting their potential in diverse technological fields.The current challenges in interfacial heat transfer research and the prospect of PC-TIMs are also discussed.The data-driven machine learning technologies will play an increasingly important role in addressing material development and performance prediction.展开更多
The improvement of the heat transfer rate of phase change material（PCM）is studied by mixing with carbon fiber（CF）which is a good heat conductor.The composite PCM is prepared by blending CF and n-Docosane and its t...The improvement of the heat transfer rate of phase change material（PCM）is studied by mixing with carbon fiber（CF）which is a good heat conductor.The composite PCM is prepared by blending CF and n-Docosane and its thermal performance is tested using the method of differential scanning calorimetry（DSC）analysis and thermogravimetric/differential thermal analysis（TG/DTA）.In addition,the influence of the mixing amount and the length of CF on the thermal conductivity of n-Docosane are investigated.The results show that CF can significantly improve the heat transfer rate of n-Docosane,and the mixing amount and the length of CF are two influence factors.The heat storage and release rates increase with the increase in the mixing amount of CF.Moreover,the melting point of n-Docosane is increased from 40.2 to 50.8 ℃ after being mixed with CF.The heating time is decreased from 720 to 660 s by mixing with 6% of CF,and is decreased to 600 s by mixing with 10% of CF.展开更多
Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule te...Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule technology of phase change materials and its main functions and the structural composition, preparation methods and characterization technology of microcapsule of phase change materials. The microcapsule of phase change materials is small in size and its temperature remains unchanged during the process of heat absorption and heat release. It is of great value in research and application prospect due to these characteristics.展开更多
Phase change material(PCM)can reduce the indoor temperature fluctuation and humidity control material can adjust relative humidity used in buildings.In this study,a kind of composite phase change material particles(CP...Phase change material(PCM)can reduce the indoor temperature fluctuation and humidity control material can adjust relative humidity used in buildings.In this study,a kind of composite phase change material particles(CPCMPs)were prepared by vacuum impregnation method with expanded perlite(EP)as supporting material and paraffin as phase change material.Thus,a PCM plate was fabricated by mould pressing method with CPCMPs and then composite phase change humidity control wallboard(CPCHCW)was prepared by spraying the diatom mud on the surface of PCM plate.The composition,thermophysical properties and microstructure were characterized using X-ray diffraction instrument(XRD),differential scanning calorimeter(DSC)and scanning electron microscope(SEM).Additionally,the hygrothermal performance of CPCHCW was characterized by temperature and humidity collaborative test.The results can be summarized as follows:(1)CPCMPs have suitable phase change parameters with melting/freezing point of 18.23°C/29.42°C and higher latent heat of 54.66 J/g/55.63 J/g;(2)the diatom mud can control the humidity of confined space with a certain volume;(3)the combination of diatom mud and PCM plate in CPCHCW can effectively adjust the indoor temperature and humidity.The above conclusions indicate the potential of CPCHCW in the application of building energy efficiency.展开更多
基金supported by the National Natural Science Foundation of China(No.52127816),the National Key Research and Development Program of China(No.2020YFA0715000)the National Natural Science and Hong Kong Research Grant Council Joint Research Funding Project of China(No.5181101182)the NSFC/RGC Joint Research Scheme sponsored by the Research Grants Council of Hong Kong and the National Natural Science Foundation of China(No.N_PolyU513/18).
文摘Latent heat thermal energy storage(TES)effectively reduces the mismatch between energy supply and demand of renewable energy sources by the utilization of phase change materials(PCMs).However,the low thermal conductivity and poor shape stability are the main drawbacks in realizing the large-scale application of PCMs.Promisingly,developing composite PCM(CPCM)based on porous supporting mate-rial provides a desirable solution to obtain performance-enhanced PCMs with improved effective thermal conductivity and shape stability.Among all the porous matrixes as supports for PCM,three-dimensional carbon-based porous supporting material has attracted considerable attention ascribing to its high ther-mal conductivity,desirable loading capacity of PCMs,and excellent chemical compatibility with various PCMs.Therefore,this work systemically reviews the CPCMs with three-dimensional carbon-based porous supporting materials.First,a concise rule for the fabrication of CPCMs is illustrated in detail.Next,the experimental and computational research of carbon nanotube-based support,graphene-based support,graphite-based support and amorphous carbon-based support are reviewed.Then,the applications of the shape-stabilized CPCMs including thermal management and thermal conversion are illustrated.Last but not least,the challenges and prospects of the CPCMs are discussed.To conclude,introducing carbon-based porous materials can solve the liquid leakage issue and essentially improve the thermal conductivity of PCMs.However,there is still a long way to further develop a desirable CPCM with higher latent heat capacity,higher thermal conductivity,and more excellent shape stability.
基金supported by the National Natural Science Foundation of China(Grant No.51976092)。
文摘High-temperature phase change materials(PCMs)have attracted significant attention in the field of thermal energy storage due to their ability to store and release large amounts of heat within a small temperature fluctuation range.However,their practical application is limited due to problems such as leakage,corrosion,and volume changes at high temperatures.Recent research has shown that macroencapsulation technology holds promise in addressing these issues.This paper focuses on the macroencapsulation technology of high-temperature PCMs,starting with a review of the classification and development history of high-temperature macroencapsulatd PCMs.Four major encapsulation strategies,including electroplating method,solid/liquid filling method,sacrificial material method,and powder compaction into sphere method,are then summarized.The methods for effectively addressing issues such as corrosion,leakage,supercooling,and phase separation in PCMs are analyzed,along with approaches for improving the heat transfer performance,mechanical strength,and thermal cycling stability of macrocapsules.Subsequently,the structure and packing arrangement optimization of macrocapsules in thermal storage systems is discussed in detail.Finally,after comparing the performance of various encapsulation strategies and summarizing existing issues,the current technical challenges,improvement methods,and future development directions are proposed.More attention should be given to utilizing AI technology and reinforcement learning to reveal the multiphysics-coupled heat and mass transfer mechanisms in macrocapsule applications,as well as to optimize material selection and encapsulation parameters,thereby enhancing the overall efficiency of thermal storage systems.
基金Funded by Scientific and Technological Innovation Project of Carbon Emission Peak and Carbon Neutrality of Jiangsu Province(No.BE2022028-4)。
文摘We adopted the solution impregnation route with aluminum dihydrogen phosphate solution as liquid medium for effective surface modification on graphite substrate.The mass ratio of graphite to Al(H_(2)PO_(4))_(3) changed from 0.5:1 to 4:1,and the impregnation time changed from 1 to 7 h.The typical composite phase change thermal storage materials doped with the as-treated graphite were fabricated using form-stable technique.To investigate the oxidation and anti-oxidation behavior of the impregnated graphite at high temperatures,the samples were put into a muffle furnace for a cyclic heat test.Based on SEM,EDS,DSC techniques,analyses on the impregnated technique suggested an optimized processing conditions of a 3 h impregnation time with the ratio of graphite:Al(H_(2)PO_(4))_(3) as 1:3 for graphite impregnation treatment.Further investigations on high-temperature phase change heat storage materials doped by the treated graphite suggested excellent oxidation resistance and thermal cycling performance.
基金supported by the National Natural Science Foundation of China(No.52103093,52103205)the Taishan Scholar Project of Shandong Province(No.tsqn202312187)+2 种基金the Natural Science Foundation of Shandong Province(ZR2024QE220)the Young Elite Scientists Sponsorship Program by CAST(No.2021QNRC001)the Jiangxi Provincial Natural Science Foundation(20232BAB214031,20242BAB25237).
文摘The urgent demand for renewable energy solutions,propelled by the global energy crisis and environmental concerns,has spurred the creation of innovative materials for solar thermal storage.Photothermal phase change materials(PTPCMs)represent a novel type of composite phase change material(PCM)aimed at improving thermal storage efficiency by incorporating photothermal materials into traditional PCMs and encapsulating them within porous structures.Various porous encapsulation materials have been studied,including porous carbon,expanded graphite,and ceramics,but issues like brittleness hinder their practical use.To overcome these limitations,flexible PTPCMs using organic porous polymers—like foams,hydrogels,and porous wood—have emerged,offering high porosity and lightweight characteristics.This review examines recent advancements in the preparation of PTPCMs based on porous polymer supports through techniques like impregnation and in situ polymerization,assessing the impact of different porous polymer materials on PCM performance and clarifying the mechanisms of photothermal conversion and heat storage.Subsequently,the most recent advancements in the applications of porous polymer-based PTPCMs are systematically summarized,and future research challenges and possible solutions are discussed.This review aims to foster awareness about the potential of PTPCMs in promoting environmentally friendly energy practices and catalyzing further research in this promising field.
文摘Oriented graphene aerogels have limited applica-tions because the flexibility of their graphene sheets and mi-crostructure give them a low skeleton strength,insufficient compression resilience,and poor flexibility.We report the preparation of novel aerogel materials with a much better per-formance.Using the driving force of graphene oxide(GO)self-assembly andπ-πinteractions,carbon nanotubes(CNTs)were attached to the GO sheets,and an oriented composite carbon skeleton was constructed using“hydro-plastic foam-ing”.The introduction of CNTs significantly increased the strength of the skeleton and gave the aerogel an excellent re-versible compressibility.The innovative use of cold pressing greatly improved the thermal conductivity and flexibility of the aerogel,providing new ideas for the development of high-performance aerogels.Tests show that the obtained graphene composite aerogel has a reversible compressive strain of over 90%and can withstand 500 compression cycles along the direc-tion of pore accumulation.It can endure more than 10000 bending cycles perpendicular to the direction of composite carbon layer stacking,and its in-plane thermal conductivity reaches 64.5 W·m^(-1)·K^(-1).When filled with phase change materials,the high porosity of the carbon skeleton enables the material to have a high phase change filling rate,and its phase change enthalpy is greater than 150 J/g.Thanks to the exceptional flexibility of the carbon skeleton,the macrostructure of phase change materials can be bent as needed to adapt to thermal management scenarios and conform to device shapes.This significantly enhances practical application compatibility,providing flexible support for temperature control and thermal management across diverse device forms.
基金supported by the National Natural Science Foundation of China(Grant No.12347101).
文摘Using periodic refractive index perturbations,the Brillouin zone is folded,transforming the guided modes in a metasurface into guided resonances with arbitrarily high quality-factors.The incorporation of phase change materials within the metasurface enables dynamic modulation of the guided modes.The system’s symmetry ensures a polarization-independent response under normal incidence.Furthermore,the metasurface exhibits excellent sensing performance,demonstrating its potential for advanced photonic applications.
基金supported by Basic and Applied Basic Research Foundation of Guangdong Province(No.2024A1515010772)State Key Laboratory of Massive Personalized Customization System and Technology,No.H&C-MPC-2023-02-06(Q)+2 种基金“CUG scholar”Scientific Research Funds at China University of Geosciences,Wuhan(No.CUG2022185)Guangzhou Youth Top Talent ProgramChina College Student Innovation and Entrepreneurship Training Program(No.S202410491063).
文摘With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensure human thermal comfort in extreme environments. Biomimetic structures have emerged as a novel source of inspiration for PTM applications. This review systematically summarizes the biomimetic structures, phase change materials, manufacturing methods, and the performance of multifunctional PTM wearables. Firstly, it analyzes the biomimetic structures with thermal regulation and encapsulated phase change material functionalities from different dimensions, highlighting their applications in PTM. Subsequently, it outlines the conventional manufacturing methods incorporating various biomimetic structures, offering strategies for the production of PTM wearables. The review also discusses the typical performance characteristics of multifunctional PTM wearables, addressing the current demands in thermal management. Finally, opportunities and challenges in PTM field are proposed, proposing new directions for future research.
基金funding from Horizon Europe Research and Innovation Action programme under Grant Agreement No.101083827,funded by the European Union.
文摘Latent heat thermal energy storage(LHTES)is an attractive method for enhancing the functionality and availability of renew-able energy sources,and it is extensively used to support concentrated solar power technologies.The main feature of every LHTES sys-tem is a phase change material(PCM),i.e.,a substance used to absorb/release energy upon cyclic melting/solidification.This study in-vestigates the potential of ferro-alloys as high-performance PCM candidates,targeting energy storage capacities exceeding 1 MWh·m^(−3),and operational temperatures above 1000°C.A thermodynamic assessment of binary and ternary Fe-based systems,alloyed with Si,B,Cr,V,and Ti,was conducted to identify compositions with optimal phase transition characteristics and heat storage potential.The results highlight the significant potential of the Fe-Si-B system,where boron’s exceptionally high latent heat enhances energy storage capacity despite challenges posed by its high melting point and cost.The Fe-Si-Cr system revealed promising alloys,such as Fe-34Si-38Cr and Fe-34Si-43Cr,offering excellent energy storage density and favorable phase transition temperatures.In the Fe-Si-V system,vanadium additions produced alloys like Fe-36Si-14V and Fe-34Si-10V,which meet energy storage criteria,although the high melting points of some Si-V phases may restrict their practical applicability.The Fe-Si-Ti system showed standout compositions,including Fe-38Si-20Ti and Si-48Ti,achieving energy storage capacities of approximately 1.5 MWh·m^(−3).This study compares ferro-alloy PCMs against state-of-the-art metallic PCMs,highlighting the performance of certain ferro-alloys.
基金supported by the Open Research Fund of Guangdong Advanced Carbon Materials Co.,Ltd (No. Kargen-2024B1707)
文摘Solar-thermoelectric generators(STEGs)capable of harnessing solar energy for conversion into clean electricity are pivotal for advancing towards carbon neutrality.The integration of phase change materials(PCMs)with STEGs facilitates power generation regardless of solar radiation flux due to their robust thermal management capacity.However,the inherent solar-thermal conversion efficiency limitation of PCMs hinders the production of high and sustained electrical output.Herein,a multidimensional engineering strategy is proposed to align two-dimensional(2D)molybdenum disulfide(MoS_(2))nanosheets vertically in situ on a dodecahedron composed of zero-dimensional(OD)Co nanoparticles and three-dimensional(3D)high graphitized carbon derived from ZIF-67,thus significantly boosting the solar-thermoelectric energy generation of polyethylene glycol(PEG).The resultant PEG-Co/C@MoS_(2)composite PCMs exhibit a high solar-thermal conversion efficiency of 92.89%,benefiting from the synergy of multiple components and unique structural arrangements.When coupled with thermoelectric devices,this powerful STEG yields a high and durable output voltage of 197.51 mV and a current of 52.47 mA under 100 mW cm^(−2),outperforming the majority of previously reported literature.This PCM-integrated solar-thermoelectric generator overcomes limitations associated with temporal and meteorological variations,enabling simultaneous high-density heat and electricity generation for energy conservation and environmental sustainability.
基金financially supported by the National Natural Science Foundation of China(No.51902025).
文摘Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials(PCMs).Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems,enabling PCMs to perform unprecedented functions(such as green energy utilization,magnetic thermotherapy,drug release,etc.).The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite PCMs.However,a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still missing.Herein,we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite PCMs.We delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions,meticulously scrutinizing the intricate interplay between their architectures and thermophysical attributes.Moreover,we prognosticate future research trajectories,delineate alternative stratagems,and illuminate prospective avenues.This review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.
基金supported by the National Natural Science Foundation of China(Nos.52222602,and52236006)the Fundamental Research Funds for the Central Universities(Nos.FRF-EYIT-23-05,and FRF-TP-22-001C1)+1 种基金Noncommunicable Chronic Diseases-National Science and Technology Major Project(No.2023ZD0500902)the member of the Youth Innovation Promotion Association Foundation of CAS,China(No.2023310)。
文摘Investigating thermal transport mechanisms at the interface between phase change materials(PCMs)and high thermally conductive fillers has become increasingly significant in developing phase change energy storage technologies.This study explores the interfacial thermal transport between a representative PCM,erythritol,and various fillers,including crystalline(Si C,Si_(3)N_(4))and amorphous(Si O_(2))nanoparticles,using molecular dynamics(MD)simulations.Additionally,time-domain thermoreflectance(TDTR)experiments were performed to quantify the interfacial thermal conductance between erythritol and the three types of fillers,yielding values of 50.1,40.0,and25.6 MW m^(–2)K^(-1).These results align well with the trends observed in the simulations.Furthermore,the underlying mechanisms of interfacial heat transfer were analyzed by examining the phonon density of states,overlap energy,and interaction energy.This research provides innovative insights into nanoscale interfacial thermal transport in composite PCMs.This could lead to significant advancements in thermal management technologies,particularly in developing more efficient thermal energy storage systems.
基金supported in entire part by the Biomaterials and Transport Phenomena Laboratory Agreement No.30303-12-2003,at the University of Medea.
文摘Refrigeration systems are essential across various sectors,including food preservation,medical storage,and climate control.However,their high energy consumption and environmental impact necessitate innovative solutions to enhance efficiency while minimizing energy usage.This paper investigates the integration of Phase Change Materials(PCMs)into a vapor compression refrigeration system to enhance energy efficiency and temperature regulation for food preservation.A multifunctional prototype was tested under two configurations:(1)a standard thermally insulated room,and(2)the same room augmented with eutectic plates filled with either Glaceol(-10℃ melting point)or distilled water(0℃ melting point).Thermocouples were calibrated and deployed to record air and PCM temperatures during freeze–thaw cycles at thermostat setpoints of and Additionally,a-30℃ -35℃ .defrosting resistor and timer were added to mitigate frost buildup,a known cause of efficiency loss.The experimental results show that PCM-enhanced rooms achieved up to 10.98℃ greater temperature stability during defrost cycles and reduced energy consumption by as much as 7.76%(from 0.4584 to 0.4231 kWh/h).Moreover,the effectiveness of PCMs depended strongly on thermostat settings and PCM type,with distilled water demonstrating broader solidification across plates under higher ambient loads.These findings highlight the potential of PCM integration to improve cold-chain performance,offering rapid cooling,moisture retention,and extended product conservation during power interruptions.
基金supported by the National Key Research and Development Program of China(2022YFB3806501)the National Natural Science Foundation of China(22178050,22108026)+3 种基金the Young Elite Scientists Sponsorship Program by CAST(2021QNRC001)the Natural Science Foundation of Liaoning Province(2022-BS-091)the Dalian Science and Technology Innovation Fund Young Tech Star(2022RQ008)the Fundamental Research Funds for the Central Universities(DUT22LAB610).
文摘Thermal runaway(TR)is considered a significant safety hazard for lithium batteries,and thermal protection materials are crucial in mitigating this risk.However,current thermal protection materials generally suffer from poor mechanical properties,flammability,leakage,and rigid crystallization,and they struggle to continuously block excess heat transfer and propagation once thermal saturation occurs.This study proposes a novel type of thermal protection material:an aerogel coupled composite phase change material(CPCM).The composite material consists of gelatin/sodium alginate(Ge/SA)composite biomass aerogel as an insulating component and a thermally induced flexible CPCM made from thermoplastic polyester elastomer as a heat-absorbing component.Inspired by power bank,we coupled the aerogel with CPCM through the binder,so that CPCM can continue to‘charge and store energy’for the aerogel,effectively absorbing heat,delaying the heat saturation phenomenon,and maximizing the duration of thermal insulation.The results demonstrate that the Ge/SA aerogel exhibits excellent thermal insulation(with a temperature difference of approximately 120℃ across a 1 cm thickness)and flame retardancy(achieving a V-0 flame retardant rating).The CPCM exhibits high heat storage density(811.9 J g^(−1)),good thermally induced flexibility(bendable above 40℃),and thermal stability.Furthermore,the Ge/SA-CPCM coupled composite material shows even more outstanding thermal insulation performance,with the top surface temperature remaining at 89℃ after 100 min of exposure to a high temperature of 230℃.This study provides a new direction for the development of TR protection materials for lithium batteries.
基金Project supported by the National Natural Science Foundation of China(Grant No.12274225)the Fundamental Research Funds for the Central Universities(Grant No.NS2023056)+1 种基金the Natural Science Foundation of Hebei Province,China(Grant No.B2024209014)the Basic Scientific Research Project of Hebei Provincial Department of Education(Grant No.JJC2024059)。
文摘We propose a novel approach for investigating the tunable Goos–H?nchen(GH)shift via an all-dielectric metasurface that incorporates phase change materials(PCMs).By introducing material asymmetry through the reconfigurable characteristic of PCMs while maintaining fixed geometric parameters,we can achieve tunable dual quasi-bound states in the continuum with ultrahigh quality factors(Q factors).Enabled by such tunable dual modes with significant phase changes,the PCM-based metasurface exhibits giant-tunable bidirectional GH shifts compared to conventional metasurfaces.Notably,the GH shift exhibits multidimensional tunability,including PCM-driven switching(amorphous to crystalline),incident-angle dependence(θ),and wavelength selectivity(λ).The maximum observed shift reaches approximately 104 wavelengths,accompanied by a corresponding Q factor of 107.Our work demonstrates its potential for applications in ultrahigh-precision multifunctional devices,from biosensing to reconfigurable nanophotonic switches.
基金supported by NEWSAFE(No.:PID2022‐143324NA‐I00)Projects funded by MICIU(Ministerio de Ciencia,Innovación y Universidades)/AEI(Agencia Estatal de Investigación)/10.13039/501100011033 and,as appropriate,by“ERDF/EU”Ramón y Cajal Fellowship(No.:RYC2023‐045023‐I)funded by MICIU,and,as appropriate,“ESF Investing in your future.”This study was also partially supported by INC‐UDIT‐2025‐PRO21 and INC‐UDIT‐2025‐JCR24.
文摘This study begins by exploring the typical practical applications of phase‐change materials(PCMs)in various industries,highlighting their importance in energy storage,temperature regulation,and thermal management.It then emphasizes the necessity of flame‐retardant functionalization tailored to the specific application scenarios of PCMs,especially considering their use in safety‐critical environments such as electronics,automotive,and construction.The classic characterization methods for assessing the flame‐retardant properties of PCM are introduced in detail,including the limiting oxygen index,the vertical burning test,and the cone calorimeter,which are widely recognized standards in material safety testing.Additionally,newly developed methods for evaluating combustion safety are discussed,such as direct combustion tests,candle combustion experiments,and back temperature response,which offer a more comprehensive understanding of the material's fire resistance.Following this,this study provides a thorough summary and categorization of the flame‐retardant strategies used in PCMs,divided into four main approaches:(1)incorporation of external flame retardants,(2)use of flame‐retardant microcapsules,(3)development of flame‐retardant support materials,and(4)creation of intrinsic flame‐retardant PCMs.Each strategy is critically analyzed in terms of effectiveness,applicability,and potential challenges.Lastly,the conclusion provides an overview of the current state of flame‐retardant PCMs,offering insights into future development directions,including the pursuit of more sustainable and efficient flame‐retardant solutions,as well as prospects for their broader adoption in various industries.
文摘In order to address the synergistic optimization of energy efficiency improvement in the waste incineration power plant(WIPP)and renewable energy accommodation,an electricity-hydrogen-waste multi-energy system integrated with phase change material(PCM)thermal storage is proposed.First,a thermal energy management framework is constructed,combining PCM thermal storage with the alkaline electrolyzer(AE)waste heat recovery and the heat pump(HP),while establishing a PCM-driven waste drying system to enhance the efficiency of waste incineration power generation.Next,a flue gas treatment method based on purification-separation-storage coordination is adopted,achieving spatiotemporal decoupling between waste incineration and flue gas treatment.Subsequently,a two-stage optimal dispatching strategy for the multi-energy system is developed:the first stage establishes a dayahead economic dispatch model with the objective of minimizing net system costs,while the second stage introduces model predictive control(MPC)to realize intraday rolling optimization.Finally,The optimal dispatching strategies under different scenarios are obtained using the Gurobi solver,followed by a comparative analysis of the optimized operational outcomes.Simulation results demonstrate that the proposed system optimizes the output and operational states of each unit,simultaneously reducing carbon trading costs while increasing electricity sales revenue.The proposed scheduling strategy demonstrates effective grid peak-shaving functionality,thereby simultaneously improving the system’s economic performance and operational flexibility while providing an innovative technical pathway for municipal solid waste(MSW)resource utilization and low-carbon transformation of energy systems.
基金funding from the National Natural Science Foundation of China(Grant Nos.52306214,52425601,and 52276074)the Shanghai Chenguang Plan Program(Grant No.22CGA78)the National Key Research and the Development Program of China(Grant No.2023YFB4404104)。
文摘Phase change thermal interface materials(PC-TIMs)have emerged as a promising solution to address the increasing thermal management challenges in electronic devices.This is attributed to their dual mechanisms of latent heat absorption and phase change-induced interfacial wettability.This review explores the fundamental principles,material innovations,and diverse applications of PC-TIMs.The heat transfer enhancement mechanisms are first underlined with key factors such as thermal carrier mismatch at the microscale and contact geometry at the macroscale,emphasizing the importance of material selection and design for optimizing thermal performance.Section 2 focuses on corresponding experimental approaches provided,including intrinsic thermal conductivity improvements and interfacial heat transfer optimization.Section 3 discusses common methods such as physical adsorption via porous materials,chain-crosslinked network designs,and core-shell structures,and their effects on leakage prevention,heat transfer enhancement,and application flexibility.Furthermore,the extended applications of PC-TIMs in thermal energy storage are explored in Section 4,suggesting their potential in diverse technological fields.The current challenges in interfacial heat transfer research and the prospect of PC-TIMs are also discussed.The data-driven machine learning technologies will play an increasingly important role in addressing material development and performance prediction.
基金The National Natural Science Foundation of China(No.50808042)the National Key Technology R&D Program of China during the 11th Five-Year Plan Period(No.2007BA000875-04)+2 种基金Six Projects Sponsoring Talent Summits of Jiangsu Province,Outstanding Young Teacher Funding Schemes of Southeast UniversityOpen Fund of Key Laboratory of Inorganic and Composite Materials of Jiangsu Province(No.wjjqfhxcl200703)the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry
文摘The improvement of the heat transfer rate of phase change material（PCM）is studied by mixing with carbon fiber（CF）which is a good heat conductor.The composite PCM is prepared by blending CF and n-Docosane and its thermal performance is tested using the method of differential scanning calorimetry（DSC）analysis and thermogravimetric/differential thermal analysis（TG/DTA）.In addition,the influence of the mixing amount and the length of CF on the thermal conductivity of n-Docosane are investigated.The results show that CF can significantly improve the heat transfer rate of n-Docosane,and the mixing amount and the length of CF are two influence factors.The heat storage and release rates increase with the increase in the mixing amount of CF.Moreover,the melting point of n-Docosane is increased from 40.2 to 50.8 ℃ after being mixed with CF.The heating time is decreased from 720 to 660 s by mixing with 6% of CF,and is decreased to 600 s by mixing with 10% of CF.
文摘Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule technology of phase change materials and its main functions and the structural composition, preparation methods and characterization technology of microcapsule of phase change materials. The microcapsule of phase change materials is small in size and its temperature remains unchanged during the process of heat absorption and heat release. It is of great value in research and application prospect due to these characteristics.
基金Project(51408184)supported by the National Natural Science Foundation of ChinaProject(E2017202136)supported by the Natural Science Foundation of Hebei Province,China+1 种基金Project(BSBE2017-05)supported by the Opening Funds of State Key Laboratory of Building Safety and Built Environment and National Engineering Research Center of Building Technology,ChinaProject(QG2018-3)supported by Hebei Provincial Department of Transportation,China
文摘Phase change material(PCM)can reduce the indoor temperature fluctuation and humidity control material can adjust relative humidity used in buildings.In this study,a kind of composite phase change material particles(CPCMPs)were prepared by vacuum impregnation method with expanded perlite(EP)as supporting material and paraffin as phase change material.Thus,a PCM plate was fabricated by mould pressing method with CPCMPs and then composite phase change humidity control wallboard(CPCHCW)was prepared by spraying the diatom mud on the surface of PCM plate.The composition,thermophysical properties and microstructure were characterized using X-ray diffraction instrument(XRD),differential scanning calorimeter(DSC)and scanning electron microscope(SEM).Additionally,the hygrothermal performance of CPCHCW was characterized by temperature and humidity collaborative test.The results can be summarized as follows:(1)CPCMPs have suitable phase change parameters with melting/freezing point of 18.23°C/29.42°C and higher latent heat of 54.66 J/g/55.63 J/g;(2)the diatom mud can control the humidity of confined space with a certain volume;(3)the combination of diatom mud and PCM plate in CPCHCW can effectively adjust the indoor temperature and humidity.The above conclusions indicate the potential of CPCHCW in the application of building energy efficiency.
