Based on the analysis of actual energy consumptions during stevia sugar production,practical measures were proposed to save energy（ gas,water and powder） consumption and reduce cost through waste heat recycle and ut...Based on the analysis of actual energy consumptions during stevia sugar production,practical measures were proposed to save energy（ gas,water and powder） consumption and reduce cost through waste heat recycle and utilization,process improvement,equipment operation efficiency,application of newly energysaving equipment,and some project applications were provided as case study for some techniques and methods adopted in the production.展开更多
With the rapid development of China's economy and society and the continuous improvement of the level of science and technology, thermal power industry in a good historical opportunity to get substantial developme...With the rapid development of China's economy and society and the continuous improvement of the level of science and technology, thermal power industry in a good historical opportunity to get substantial development, has become one of the important modes of energy production in China's current stage, in China's electric power production field occupies an important position that cannot be ignored. At the same time, with the continuous improvement of people's living standards, people from all walks of life have further improved their requirements for power quality. As an important power production supplier in China, thermal power plants have a direct impact on the improvement of power supply quality and regional economic development in some regions due to the power resource supply mode and operation management mode. As an important part of power supply of thermal power plant, the level of energy consumption of turbine unit is directly related to the overall economic benefits of thermal power plant. Therefore, it is of great theoretical significance and practical value to explore the factors affecting the energy consumption of steam turbine units in thermal power plants and relevant measures for energy conservation and consumption reduction.展开更多
The concept of environmental protection has gradually taken root in the hearts of the people, and people's desire for a better life is constantly improving. Therefore, the demand for HVAC is also gradually increas...The concept of environmental protection has gradually taken root in the hearts of the people, and people's desire for a better life is constantly improving. Therefore, the demand for HVAC is also gradually increasing. It is hoped that the HVAC system can accurately control the temperature and humidity in your room to meet your own needs. But also expect to continuously reduce energy consumption and low energy consumption to meet environmental requirements. HVAC is one of the most important equipment to ensure the comfortable environment in the building. At present, it is widely used in shopping malls, hospitals and other places. However, the HVAC system consumes a lot of energy such as electricity, and the energy consumption of buildings will gradually increase. In order to further solve this problem and reduce the overall energy consumption of the building after operation. It has become very necessary to introduce energy-saving and consumption-reducing technologies and control systems, and to improve the design and science of HVAC equipment through rational use. While reducing the energy consumption of its own air-conditioning system, it also increases the need for environmental protection and emission reduction of buildings. At the same time, industry is encouraged to make contributions to environmental protection so as to achieve better results and provide impetus for making contributions to environmental protection.展开更多
Degrading volatile organic compounds at low temperatures and active sites aggregation are still challenging.In this study,a novel mesoporous zeolite silicalite-1(S-1–meso)enveloped Pt–Ni bimetallic catalysts(noted a...Degrading volatile organic compounds at low temperatures and active sites aggregation are still challenging.In this study,a novel mesoporous zeolite silicalite-1(S-1–meso)enveloped Pt–Ni bimetallic catalysts(noted as Pt1Ni1@S-1–meso)were synthesized via a facile in situ mesoporous template-free method.The Pt–Ni bimetallic nanoparticles were uniformly distributed and displayed a large specific surface area and enriched mesopores to facilitate the deep oxidation of toluene.The presence of the Pt–Ni O interface both increased the dispersion of the catalyst and improved its catalytic performance,thereby reducing the consumption of Pt.The Mars-van Krevelen mechanism and density function theory(DFT)calculations revealed that the Pt–Ni O interface effect changed the electronic structure of Pt and Ni species,reduced the activation potential for oxygen,formed reactive oxygen species,and facilitated the adsorption and activation of reactants in the direction favorable to the toluene oxidation.This study provides a guideline for minimizing the proportion of precious metals used in practical applications and a promising method for toluene elimination at low temperatures.展开更多
The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking en...The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking energy feedback unit and battery energy storage unit is proposed,which provides green power for the station.In order to suppress the fluctuation of photovoltaic power generation and the intermittence of regenerative braking feedback energy,the energy management mode of microgrid is designed according to the illumination situation,braking energy feedback situation,battery state of charge and so on.In addition,a coordination control method based on virtual synchronous generator(VSG)is proposed to realize smooth switching among modes.Finally,the proposed energy management and coordination control method for elevated station microgrid is verified by Matlab/Simulink.The results show that the elevated station microgrid can operate safely and reliably under various energy management modes and realize smooth switching among modes.展开更多
Beyond energy efficiency,there are now urgent challenges around the supply of resources,materials,food and water.After debating energy-efficiency for the last decade,the focus has shifted to include resource and mater...Beyond energy efficiency,there are now urgent challenges around the supply of resources,materials,food and water.After debating energy-efficiency for the last decade,the focus has shifted to include resource and material-efficiency.In this context,urban farming has emerged as a valid urban design strategy in Europe,where food is produced and consumed locally within city boundaries,turning disused sites into productive urban landscapes and community gardens.Agricultural activities allow for effective composting of organic waste,returning nutrients to the soil and improving biodiversity in the urban environment.Urban farming will help to feed the 9 billion by 2050(predicted population growth,UN-Habitat forecast 2009).This paper reports on best practice of urban design principles in regard to materials flow,material recovery,adaptive re-use of building elements and components(‘design for disassembly’;prefabrication of modular building components),and other relevant strategies to implement zero waste by avoiding waste creation,reducing harmful consumption and changing behaviour.The paper touches on two important issues in regard to the rapid depletion of the world’s natural resources:the construction sector and the education of architects and designers.The construction sector:Prefabricated multi-story timber buildings for inner-city living can set new benchmarks for minimizing construction wastage and for sustainable on-site assembly.Today,the construction and demolition(C&D)sector is one of the main producers of waste;it does not engage enough with waste minimization,waste avoidance and recycling.Education and research:It’s still unclear how best to introduce a holistic understanding of these challenges and to better teach practical and affordable solutions to architects,urban designers,industrial designers,and so on.One of the findings of this paper is that embedding‘zero-waste’requires strong industry leadership,new policies and effective education curricula,as well as raising awareness(education)and refocusing research agendas to bring about attitudinal change and the reduction of wasteful consumption.展开更多
In Kuwait air-conditioning systems consume approximately 70%of the grid energy during the long summer months.In this paper,various practical approaches are investigated to enhance the energy efficiency and decrease th...In Kuwait air-conditioning systems consume approximately 70%of the grid energy during the long summer months.In this paper,various practical approaches are investigated to enhance the energy efficiency and decrease the energy consumption of five existing air-conditioned(AC)buildings in Kuwait City.The process of energy management in air-conditioned buildings in Kuwait is overwhelming due to high energy consumption in the building sector.This study proposed an optimization technique for the proper energy management of installed AC systems to target energy-efficient buildings.In this study the aim is to explore the effect of different operating parameters,both theoretically and experimentally,and to contribute to the reduction of AC energy consumption.Consequently,the relationship between the thermal load in the air-conditioned buildings and the actual electrical energy consumption is determined,and remedial measures,along with different recom-mendations for energy saving,are presented.The actual thermal loads of each selected building were calculated and compared with the installed cooling capacity of the AC systems.From the results obtained it was concluded that,by implement-ing the suggested remedial measures,the predicted load in the selected buildings could be decreased significantly from the existing installed capacity of the cooling systems.Most of the remedial measures suggested for energy management lead to a reduction in power consumption and increased energy efficiency at different levels based on the specifications of the buildings considered and the AC systems installed,resulting in improved in economy,a reduced carbon footprint,and a cleaner environment.展开更多
文摘Based on the analysis of actual energy consumptions during stevia sugar production,practical measures were proposed to save energy（ gas,water and powder） consumption and reduce cost through waste heat recycle and utilization,process improvement,equipment operation efficiency,application of newly energysaving equipment,and some project applications were provided as case study for some techniques and methods adopted in the production.
文摘With the rapid development of China's economy and society and the continuous improvement of the level of science and technology, thermal power industry in a good historical opportunity to get substantial development, has become one of the important modes of energy production in China's current stage, in China's electric power production field occupies an important position that cannot be ignored. At the same time, with the continuous improvement of people's living standards, people from all walks of life have further improved their requirements for power quality. As an important power production supplier in China, thermal power plants have a direct impact on the improvement of power supply quality and regional economic development in some regions due to the power resource supply mode and operation management mode. As an important part of power supply of thermal power plant, the level of energy consumption of turbine unit is directly related to the overall economic benefits of thermal power plant. Therefore, it is of great theoretical significance and practical value to explore the factors affecting the energy consumption of steam turbine units in thermal power plants and relevant measures for energy conservation and consumption reduction.
文摘The concept of environmental protection has gradually taken root in the hearts of the people, and people's desire for a better life is constantly improving. Therefore, the demand for HVAC is also gradually increasing. It is hoped that the HVAC system can accurately control the temperature and humidity in your room to meet your own needs. But also expect to continuously reduce energy consumption and low energy consumption to meet environmental requirements. HVAC is one of the most important equipment to ensure the comfortable environment in the building. At present, it is widely used in shopping malls, hospitals and other places. However, the HVAC system consumes a lot of energy such as electricity, and the energy consumption of buildings will gradually increase. In order to further solve this problem and reduce the overall energy consumption of the building after operation. It has become very necessary to introduce energy-saving and consumption-reducing technologies and control systems, and to improve the design and science of HVAC equipment through rational use. While reducing the energy consumption of its own air-conditioning system, it also increases the need for environmental protection and emission reduction of buildings. At the same time, industry is encouraged to make contributions to environmental protection so as to achieve better results and provide impetus for making contributions to environmental protection.
基金supported by the National Natural Science Foundation of China(Nos.22276086,21976078)the Natural Science Foundation of Jiangxi Province(Nos.20202ACB213001,20232BCJ22003)。
文摘Degrading volatile organic compounds at low temperatures and active sites aggregation are still challenging.In this study,a novel mesoporous zeolite silicalite-1(S-1–meso)enveloped Pt–Ni bimetallic catalysts(noted as Pt1Ni1@S-1–meso)were synthesized via a facile in situ mesoporous template-free method.The Pt–Ni bimetallic nanoparticles were uniformly distributed and displayed a large specific surface area and enriched mesopores to facilitate the deep oxidation of toluene.The presence of the Pt–Ni O interface both increased the dispersion of the catalyst and improved its catalytic performance,thereby reducing the consumption of Pt.The Mars-van Krevelen mechanism and density function theory(DFT)calculations revealed that the Pt–Ni O interface effect changed the electronic structure of Pt and Ni species,reduced the activation potential for oxygen,formed reactive oxygen species,and facilitated the adsorption and activation of reactants in the direction favorable to the toluene oxidation.This study provides a guideline for minimizing the proportion of precious metals used in practical applications and a promising method for toluene elimination at low temperatures.
基金National Natural Science Foundation of China(No.51367010)Science and Technology Program of Gansu Province(No.17JR5RA083)Program for Excellent Team of Scientific Research in Lanzhou Jiaotong University(No.201701)
文摘The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking energy feedback unit and battery energy storage unit is proposed,which provides green power for the station.In order to suppress the fluctuation of photovoltaic power generation and the intermittence of regenerative braking feedback energy,the energy management mode of microgrid is designed according to the illumination situation,braking energy feedback situation,battery state of charge and so on.In addition,a coordination control method based on virtual synchronous generator(VSG)is proposed to realize smooth switching among modes.Finally,the proposed energy management and coordination control method for elevated station microgrid is verified by Matlab/Simulink.The results show that the elevated station microgrid can operate safely and reliably under various energy management modes and realize smooth switching among modes.
文摘Beyond energy efficiency,there are now urgent challenges around the supply of resources,materials,food and water.After debating energy-efficiency for the last decade,the focus has shifted to include resource and material-efficiency.In this context,urban farming has emerged as a valid urban design strategy in Europe,where food is produced and consumed locally within city boundaries,turning disused sites into productive urban landscapes and community gardens.Agricultural activities allow for effective composting of organic waste,returning nutrients to the soil and improving biodiversity in the urban environment.Urban farming will help to feed the 9 billion by 2050(predicted population growth,UN-Habitat forecast 2009).This paper reports on best practice of urban design principles in regard to materials flow,material recovery,adaptive re-use of building elements and components(‘design for disassembly’;prefabrication of modular building components),and other relevant strategies to implement zero waste by avoiding waste creation,reducing harmful consumption and changing behaviour.The paper touches on two important issues in regard to the rapid depletion of the world’s natural resources:the construction sector and the education of architects and designers.The construction sector:Prefabricated multi-story timber buildings for inner-city living can set new benchmarks for minimizing construction wastage and for sustainable on-site assembly.Today,the construction and demolition(C&D)sector is one of the main producers of waste;it does not engage enough with waste minimization,waste avoidance and recycling.Education and research:It’s still unclear how best to introduce a holistic understanding of these challenges and to better teach practical and affordable solutions to architects,urban designers,industrial designers,and so on.One of the findings of this paper is that embedding‘zero-waste’requires strong industry leadership,new policies and effective education curricula,as well as raising awareness(education)and refocusing research agendas to bring about attitudinal change and the reduction of wasteful consumption.
文摘In Kuwait air-conditioning systems consume approximately 70%of the grid energy during the long summer months.In this paper,various practical approaches are investigated to enhance the energy efficiency and decrease the energy consumption of five existing air-conditioned(AC)buildings in Kuwait City.The process of energy management in air-conditioned buildings in Kuwait is overwhelming due to high energy consumption in the building sector.This study proposed an optimization technique for the proper energy management of installed AC systems to target energy-efficient buildings.In this study the aim is to explore the effect of different operating parameters,both theoretically and experimentally,and to contribute to the reduction of AC energy consumption.Consequently,the relationship between the thermal load in the air-conditioned buildings and the actual electrical energy consumption is determined,and remedial measures,along with different recom-mendations for energy saving,are presented.The actual thermal loads of each selected building were calculated and compared with the installed cooling capacity of the AC systems.From the results obtained it was concluded that,by implement-ing the suggested remedial measures,the predicted load in the selected buildings could be decreased significantly from the existing installed capacity of the cooling systems.Most of the remedial measures suggested for energy management lead to a reduction in power consumption and increased energy efficiency at different levels based on the specifications of the buildings considered and the AC systems installed,resulting in improved in economy,a reduced carbon footprint,and a cleaner environment.
