太阳能模拟器为高温吸热器、热化学反应器、高温材料等测试提供了稳定可靠、调节灵活的全天候辐射条件。本文介绍了一种高辐射能流的太阳能模拟器,包含19个独立的单元。每个单元包括一盏短弧氙灯(包含椭球面反射灯罩),一台冷却风机和一...太阳能模拟器为高温吸热器、热化学反应器、高温材料等测试提供了稳定可靠、调节灵活的全天候辐射条件。本文介绍了一种高辐射能流的太阳能模拟器,包含19个独立的单元。每个单元包括一盏短弧氙灯(包含椭球面反射灯罩),一台冷却风机和一台电源控制器。每盏灯的输入电流范围是50~150 A,19盏灯的灵活组合使得该设备具有非常宽泛的能流使用范围(10%~100%)。实验通过"Mapping Method"得到了聚焦平面上的能流分布、峰值能流、总功率和转换效率等参数。测试结果表明:该太阳能模拟器的总功率达到了28.95 k Wth,峰值能流为2.33 MW/m2,平均辐射能流为545.54 k W/m2(直径为260 mm焦斑面),电-热转换效率为35%。本文介绍的太阳能模拟器为太阳能高温器件的测试提供了稳定可靠的室内模拟辐射源,为相关实验部件的性能评估提供了一种新的便捷途径。展开更多
Solar water heaters(SWH) are widely used in urban areas because of their advantages in reducing energy consumption and mitigating greenhouse gas emissions. However, the performance of SWH subjected to obstructions is ...Solar water heaters(SWH) are widely used in urban areas because of their advantages in reducing energy consumption and mitigating greenhouse gas emissions. However, the performance of SWH subjected to obstructions is unclear yet. In this study, we present a numerical evaluation on thermal performance of fa?ade-installed SWH under three typical obstructed scenarios, based on various levels of sunshine duration. This study is carried out for four locations with various latitudes across China. Thermal performance is measured by solar fraction for annual and monthly evaluation. The results show that the obstruction can seriously degrade annual solar fraction of SWH, even in the 4-hour sunshine duration scenario, for all the studied locations. Interestingly, only lengthening sunshine duration in the standard day(e.g., from 2 h to 4 h) may not result in increasing annual solar fraction markedly. In terms of the monthly performance, solar fraction in January and December decreases significantly, while from May to August it just declines slightly, except for Guangzhou having a swift reduction. This study can provide insights into the behavior and promote the appropriate application of SWH in urban areas.展开更多
文摘太阳能模拟器为高温吸热器、热化学反应器、高温材料等测试提供了稳定可靠、调节灵活的全天候辐射条件。本文介绍了一种高辐射能流的太阳能模拟器,包含19个独立的单元。每个单元包括一盏短弧氙灯(包含椭球面反射灯罩),一台冷却风机和一台电源控制器。每盏灯的输入电流范围是50~150 A,19盏灯的灵活组合使得该设备具有非常宽泛的能流使用范围(10%~100%)。实验通过"Mapping Method"得到了聚焦平面上的能流分布、峰值能流、总功率和转换效率等参数。测试结果表明:该太阳能模拟器的总功率达到了28.95 k Wth,峰值能流为2.33 MW/m2,平均辐射能流为545.54 k W/m2(直径为260 mm焦斑面),电-热转换效率为35%。本文介绍的太阳能模拟器为太阳能高温器件的测试提供了稳定可靠的室内模拟辐射源,为相关实验部件的性能评估提供了一种新的便捷途径。
基金Projects(2017JJ3517,2017JJ3090)supported by the Natural Science Foundation of Hunan Province,ChinaProject(2018NK2066)supported by the Key Research and Development Program of Hunan Province,ChinaProject(QJ2017007B)supported by the Youth Scientific Research Foundation of Central South University of Forestry and Technology,China。
文摘Solar water heaters(SWH) are widely used in urban areas because of their advantages in reducing energy consumption and mitigating greenhouse gas emissions. However, the performance of SWH subjected to obstructions is unclear yet. In this study, we present a numerical evaluation on thermal performance of fa?ade-installed SWH under three typical obstructed scenarios, based on various levels of sunshine duration. This study is carried out for four locations with various latitudes across China. Thermal performance is measured by solar fraction for annual and monthly evaluation. The results show that the obstruction can seriously degrade annual solar fraction of SWH, even in the 4-hour sunshine duration scenario, for all the studied locations. Interestingly, only lengthening sunshine duration in the standard day(e.g., from 2 h to 4 h) may not result in increasing annual solar fraction markedly. In terms of the monthly performance, solar fraction in January and December decreases significantly, while from May to August it just declines slightly, except for Guangzhou having a swift reduction. This study can provide insights into the behavior and promote the appropriate application of SWH in urban areas.
