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| 1 | A New Hybrid System Design for Thermal Energy Storage显示文摘Due to some serious environmental problems like global warming and greenhouse effect,studies on solar energy systems are being conducted all over the world.The studies conducted in recent years are on hybrid designs in which solar energy systems can realize both electricity and heat production at the same time.In this way,both electrical energy and heat energy can be generated from the same system In this study,the design and analysis of a concentrated solar air collector with a heat storage unit were carried out.In the solar air collector,heat energy was depot in paraffin wax,and the electrical energy which was stored in the battery using the PV(photovoltaic)modules in the system enabled the operation of the system fan.The experiments which aimed at determining system performance were carried out in winter when the ambient temperature was low.The experiments were performed with or without a heat storage unit,and a comparative analysis was made.It was found that the temperature of the air released from the collector ranged from 15°C to 40°C when the exterior temperature was-5°C.The average efficiency of the concentrated system without the heat storage unit was calculated as 67%.The average efficiency of the concentrated system with the heat storage unit was calculated as 96%. | CEYLA Ilhan ALI Ismail Hamad Guma ERGUN Alper GUREL Ali Etem ACAR Bahadir iSLAM Nurse | 2020 | Journal of Thermal Science2020，29，5： | 1 |
| 2 | Experimental Analysis of a Solar Energy Storage Heat Pump System显示文摘This paper introduces a novel solar-assisted heat pump system with phase change energy storage and describes the methodology used to analyze the performance of the proposed system.A mathematical model was established for the key parts of the system including solar evaporator,condenser,phase change energy storage tank,and compressor.In parallel to the modelling work,an experimental set-up of the proposed solar energy storage heat pump system was developed.The experimental data showed that the designed system is capable of meeting cold day heating demands in rural areas of Yanbian city located in Jilin province of China.In day-time operation,the solar heat pump system stores excess energy in the energy storage tank for heating purposes.A desired indoor temperature was achieved;the average coefficient of performance of solar heat pump was identified as 4.5,and the system showed a stable performance throughout the day.In night-time operation,the energy stored in the storage tank was released through a liquid-solid change of phase in the employed phase-change material.In this way,the provision of continuous heat for ten hours was ensured within the building,and the desired indoor air conditions were achieved. | CHEN Haifei LI Guiqiang LING Yueyue FU Jie WANG Yunjie YANG Jie JIANG Lyulin ALI Badiei ZHANG Yang | 2021 | Journal of Thermal Science2021，30，5： | 1 |
| 3 | Heat Transfer Model Founded and Regional Suitability Analysis of Photovoltaic Walls with Different Structures显示文摘The heat transfer performance and suitability of photovoltaic walls with different structures in different regions have been studied. First, a quasi-two-dimensional calculation model was established to realize the simulation of photovoltaic walls with three structural forms(ordinary wall with air layer opening, air layer closed and no air layer);combined with the experimental data, the accuracy of the two-dimensional calculation model was verified. Based on the simulation results, the suitability of different structural forms of photovoltaic walls in areas with different climatic conditions were compared and analyzed. The results of the study show that the southern China that emphasize the purpose of ventilation and heat dissipation should adopt photovoltaic walls with open air layers, and the northern regions that emphasize the purpose of heat preservation and heat insulation should adopt photovoltaic walls with closed air layers;for transitional areas, the type of photovoltaic wall should be considered comprehensively according to environmental conditions and local building conditions. | ZHANG Wenjie ZHAO Yingbo LIU Wei GONG Tongdan LIU Kangyong | 2022 | Journal of Thermal Science2022，31，6： | 0 |
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