基于㶲损失分析的太阳能喷射制冷系统性能研究

Performance study of solar ejector refrigeration system based on exergy loss analysis

中文关键词: 太阳辐射值  喷射制冷系统  㶲损失  㶲分析法

英文关键词: solar radiation value  solar ejector refrigeration system  exergy loss  method of exergy analysis

中文摘要:

      利用㶲分析法对太阳能喷射制冷系统㶲损失随太阳辐射值的变化情况进行分析，了解系统各部件的㶲损失情况，给出系统总㶲损失随太阳辐射值变化的规律和系统各部件㶲损失占系统总㶲损失的比例随太阳辐射值变化的规律。结果表明：集热器㶲损失占系统总㶲损失的比例最大且随太阳辐射值的增加而减小，在太阳辐射值为500—1100W/m2时，集热器㶲损失占系统总㶲损失的比例为79.28%—81.94%，因此提高集热器效率对降低系统㶲损失有着至关重要的影响。另外，由于喷射器固有结构的限制，随着发生温度的升高，喷射系数EER、系统性能系数COP并非一直增大，系统存在一个最佳的发生温度；控制发生温度在75℃时，随着太阳辐射值的增大，系统性能系数 COP逐渐增大，在太阳辐射值达到600W/m2时逐渐变小。

英文摘要:

      The exergy analysis method was used to elaborate the change of exergy loss of a solar ejector refrigeration system with the variation of solar radiation, and the exergy loss of each component in the system is studied. Also, the regularity of both the total exergy loss of the system and the proportion of the exergy loss of each component in the total exergy loss with the variation of solar radiation are obtained. The result shows that the proportion of the exergy loss of heat collector accounts for 79.28% -81.94% of the total exergy loss, which is the largest part of all components, and it is decreased when solar radiation is increasing between 500—1100W/m2. Therefore, improving the efficiency of heat collector is very important for reducing the system’s exergy loss. In addition, there exist an optimal temperature because of the limitation of the inherent structure of the ejector as well as energy efficiency ratio(EER) and coefficient of performance(COP) are not always increasing when the generate temperature rises; when the generate temperature is 75°C, the COP gradually rising with the increase of solar radiation, and dwindle gradually when the solar radiation reaches 600W/m2.