Climate crisis mitigation roadmaps,policies and directives have increasingly declared that a key element for the facilitation of sustainable urban development is on-site decentralized renewable energy generation.A tec...Climate crisis mitigation roadmaps,policies and directives have increasingly declared that a key element for the facilitation of sustainable urban development is on-site decentralized renewable energy generation.A technology with enhanced capabilities,able of promoting the integration of renewable energy into buildings,for energy independent and resilient communities,is Photovoltaic Thermal(PVT)systems.Ongoing research has potential yet displays a lack in unified methodology.This limits its influence on future decision-making in building and city planning levels.In this investigation,the often overlooked air-based PVT technology is put on the spotlight and their suitability for integration with energy systems of buildings is assessed.The aim of this study is to highlight vital performance and integration roadblocks in PVT research and offer suggestions for overcoming them.The methodology of reviewed literature is examined in detail with the goal of contributing to a unified approach for more impactful research.展开更多
In the context of a growing demand for sustainable energy,air-based photovoltaic-thermal systems offer a promising solution for the simultaneous production of electricity and heat.This work aims to identify the optima...In the context of a growing demand for sustainable energy,air-based photovoltaic-thermal systems offer a promising solution for the simultaneous production of electricity and heat.This work aims to identify the optimal configuration of a low-cost,single-pass air-based photovoltaic-thermal system capable of producing hot air for certain activities in the Safi region(Morocco),such as drying agricultural or marine products,heating buildings,or air conditioning greenhouses,while ensuring electrical autonomy.The study is distinguished by a systematic investigation of an extended set of candidate air-based photovoltaic-thermal configurations(11 in total).3D simulations were carried out using COMSOL Multiphysics under identical conditions:solar irradiance of 1000 W/m2,inlet/ambient air temperature of 30℃,wind speed of 1 m/s,a fixed collector tilt of 32°,and air mass flow rates of 30,60,and 90 kg/h.Under these conditions,the unglazed UG2 and UG4 configurations achieve the highest electrical efficiencies(≈17%),while UG5 yields the highest overall exergy efficiency(≈19%).G6 stands out by delivering the highest thermal efficiency(≈25.6%),the highest overall energy efficiency(31.04-38.35%),and outlet air temperatures above 50°C,while maintaining a satisfactory electrical efficiency(≈13%).G6 also attains the highest Type Ⅱ overall energy efficiency(50.22-64.00%),indicating greater primary energy savings potential and,consequently,the largest associated CO_(2) reductions.Aligned with the study objectives,G6 is best suited to autonomous thermal applications,while UG5 is preferable when electricity production is the overriding priority.展开更多
In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agre...In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agreement with experimental data from the literature.The problem studied in this paper is reducing the energy required for heating in winter(preheating BIPV/T)and avoiding the high photovoltaic cell temperature in summer.We compare the energy consumption with and without BIPV/T-AHU in different cities in Sudan.The results showed that utilizing the exhaust air to cool the photovoltaic cell could reduce the PV/T cell temperature in the range(9-12)℃,which can increase the eletrical power output in a range of(12-21.44)W/m^(2).In winter,utilization of the preheating BIPV/T system can decrease the heating load in Wadi Halfa in the range of(6-107.1%).Damazein does not need a high heating power in the daytime for the ait conditioning system depending on the local climate,so the heat energy produced by the system can be used for drying,desiccant cooling,or heating water,with increasing the eletrice power produced by cooling PV/T cells.The results indicated a great posibility to use the BIPV 1 T system under the studied conditions,in addition,this study provides important information for the application of the BIPV/T system in these areas.展开更多
基金the financial support from the Swedish Energy Agency(grant number:52488-1).
文摘Climate crisis mitigation roadmaps,policies and directives have increasingly declared that a key element for the facilitation of sustainable urban development is on-site decentralized renewable energy generation.A technology with enhanced capabilities,able of promoting the integration of renewable energy into buildings,for energy independent and resilient communities,is Photovoltaic Thermal(PVT)systems.Ongoing research has potential yet displays a lack in unified methodology.This limits its influence on future decision-making in building and city planning levels.In this investigation,the often overlooked air-based PVT technology is put on the spotlight and their suitability for integration with energy systems of buildings is assessed.The aim of this study is to highlight vital performance and integration roadblocks in PVT research and offer suggestions for overcoming them.The methodology of reviewed literature is examined in detail with the goal of contributing to a unified approach for more impactful research.
文摘In the context of a growing demand for sustainable energy,air-based photovoltaic-thermal systems offer a promising solution for the simultaneous production of electricity and heat.This work aims to identify the optimal configuration of a low-cost,single-pass air-based photovoltaic-thermal system capable of producing hot air for certain activities in the Safi region(Morocco),such as drying agricultural or marine products,heating buildings,or air conditioning greenhouses,while ensuring electrical autonomy.The study is distinguished by a systematic investigation of an extended set of candidate air-based photovoltaic-thermal configurations(11 in total).3D simulations were carried out using COMSOL Multiphysics under identical conditions:solar irradiance of 1000 W/m2,inlet/ambient air temperature of 30℃,wind speed of 1 m/s,a fixed collector tilt of 32°,and air mass flow rates of 30,60,and 90 kg/h.Under these conditions,the unglazed UG2 and UG4 configurations achieve the highest electrical efficiencies(≈17%),while UG5 yields the highest overall exergy efficiency(≈19%).G6 stands out by delivering the highest thermal efficiency(≈25.6%),the highest overall energy efficiency(31.04-38.35%),and outlet air temperatures above 50°C,while maintaining a satisfactory electrical efficiency(≈13%).G6 also attains the highest Type Ⅱ overall energy efficiency(50.22-64.00%),indicating greater primary energy savings potential and,consequently,the largest associated CO_(2) reductions.Aligned with the study objectives,G6 is best suited to autonomous thermal applications,while UG5 is preferable when electricity production is the overriding priority.
基金This work was jointly supported by Research Fund of State Key Lab-oratory of Technologies in Space Cryogenic Propellants(SKLTSCP1601)Scientific Research Foundation of Graduate School of Southeast Uni-versity GS501100012595 NO.YBYP1903).
文摘In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agreement with experimental data from the literature.The problem studied in this paper is reducing the energy required for heating in winter(preheating BIPV/T)and avoiding the high photovoltaic cell temperature in summer.We compare the energy consumption with and without BIPV/T-AHU in different cities in Sudan.The results showed that utilizing the exhaust air to cool the photovoltaic cell could reduce the PV/T cell temperature in the range(9-12)℃,which can increase the eletrical power output in a range of(12-21.44)W/m^(2).In winter,utilization of the preheating BIPV/T system can decrease the heating load in Wadi Halfa in the range of(6-107.1%).Damazein does not need a high heating power in the daytime for the ait conditioning system depending on the local climate,so the heat energy produced by the system can be used for drying,desiccant cooling,or heating water,with increasing the eletrice power produced by cooling PV/T cells.The results indicated a great posibility to use the BIPV 1 T system under the studied conditions,in addition,this study provides important information for the application of the BIPV/T system in these areas.
