Based on a general review of marine renewable energy in China, an assessment of the development status and amount of various marine renewable energy resources, including tidal energy, tidal current energy, wave energy...Based on a general review of marine renewable energy in China, an assessment of the development status and amount of various marine renewable energy resources, including tidal energy, tidal current energy, wave energy, ocean thermal energy, and salinity gradient energy in China＇s coastal seas, such as the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea, is presented. We have found that these kinds of marine renewable energy resources will play an important role in meeting China＇s future energy needs. Additionally, considering the uneven distribution of China＇s marine renewable energy and the influences of its exploitation on the environment, we have suggested several sites with great potential for each kind of marine energy. Furthermore, perspectives on and challenges related with marine renewable energy in China are addressed.展开更多
In thermal systems such as solar thermal and waste heat recovery systems, the available energy supply does not usually coincide in time with the process demand. Hence some form of thermal energy storage (TES) is neces...In thermal systems such as solar thermal and waste heat recovery systems, the available energy supply does not usually coincide in time with the process demand. Hence some form of thermal energy storage (TES) is necessary for the most effective utilization of the energy source. This study deals with the experimental evaluation of thermal performance of a packed bed latent heat TES unit integrated with solar flat plate collector. The TES unit contains paraffin as phase change material (PCM) filled in spherical capsules, which are packed in an insulated cylindrical storage tank. The water used as heat transfer fluid (HTF) to transfer heat from the solar collector to the storage tank also acts as sensible heat storage material. Charging experiments were carried out at varying inlet fluid temperatures to examine the effects of porosity and HTF flow rate on the storage unit performance. The performance parameters such as instantaneous heat stored, cumulative heat stored, charging rate and system efficiency are studied. Discharging experiments were carried out by both continuous and batchwise processes to recover the stored heat, and the results are presented.展开更多
Single-atom materials(SAMs)have become one of the most important power sources to push the field of energy conversion forward.Among the main types of energy,including thermal energy,electrical energy,solar energy,and ...Single-atom materials(SAMs)have become one of the most important power sources to push the field of energy conversion forward.Among the main types of energy,including thermal energy,electrical energy,solar energy,and biomass energy,SAMs have realized ultra-high efficiency and show an appealing future in practical application.More than high activity,the uniform active sites also provide a convincible model for chemists to design and comprehend the mechanism behind the phenomenon.Therefore,we presented an insightful review of the application of the single-atom material in the field of energy conversion.The challenges(e.g.,accurate synthesis and practical application)and future directions(e.g.,machine learning and efficient design)of the applications of SAMs in energy conversion are included,aiming to provide guidance for the research in the next step.展开更多
基金supported by the National Natural Science Foundation of China(Grants No.51079072 and 51279088)the National High Technology Research and Development Program of China(Grant No.2012AA052602)the Tsinghua University Initiative Scientific Research Program(Grant No.20101081791)
文摘Based on a general review of marine renewable energy in China, an assessment of the development status and amount of various marine renewable energy resources, including tidal energy, tidal current energy, wave energy, ocean thermal energy, and salinity gradient energy in China＇s coastal seas, such as the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea, is presented. We have found that these kinds of marine renewable energy resources will play an important role in meeting China＇s future energy needs. Additionally, considering the uneven distribution of China＇s marine renewable energy and the influences of its exploitation on the environment, we have suggested several sites with great potential for each kind of marine energy. Furthermore, perspectives on and challenges related with marine renewable energy in China are addressed.
基金Project supported by Sri Venkateswara college of Engineering,India.
文摘In thermal systems such as solar thermal and waste heat recovery systems, the available energy supply does not usually coincide in time with the process demand. Hence some form of thermal energy storage (TES) is necessary for the most effective utilization of the energy source. This study deals with the experimental evaluation of thermal performance of a packed bed latent heat TES unit integrated with solar flat plate collector. The TES unit contains paraffin as phase change material (PCM) filled in spherical capsules, which are packed in an insulated cylindrical storage tank. The water used as heat transfer fluid (HTF) to transfer heat from the solar collector to the storage tank also acts as sensible heat storage material. Charging experiments were carried out at varying inlet fluid temperatures to examine the effects of porosity and HTF flow rate on the storage unit performance. The performance parameters such as instantaneous heat stored, cumulative heat stored, charging rate and system efficiency are studied. Discharging experiments were carried out by both continuous and batchwise processes to recover the stored heat, and the results are presented.
基金National Natural Science Foundation of China,Grant/Award Number:22325101。
文摘Single-atom materials(SAMs)have become one of the most important power sources to push the field of energy conversion forward.Among the main types of energy,including thermal energy,electrical energy,solar energy,and biomass energy,SAMs have realized ultra-high efficiency and show an appealing future in practical application.More than high activity,the uniform active sites also provide a convincible model for chemists to design and comprehend the mechanism behind the phenomenon.Therefore,we presented an insightful review of the application of the single-atom material in the field of energy conversion.The challenges(e.g.,accurate synthesis and practical application)and future directions(e.g.,machine learning and efficient design)of the applications of SAMs in energy conversion are included,aiming to provide guidance for the research in the next step.
