太阳能喷射/压缩复合制冷循环性能研究

Study on the performance of combined compression refrigeration and solar-driven ejector cooling system

研究了一种太阳能喷射/压缩复合制冷循环,由太阳能集热子系统、喷射制冷子系统及压缩制冷子系统组成,系统充分利用热电两种能源以及两种制冷方法各自的优点,优化喷射制冷子系统工作性能的同时,改善压缩式子系统的工作条件,从而提高复合制冷循环性能的同时节约高品位电能。采用性能较好的高蒸发温度式喷射制冷带走压缩机排气余热具有实际意义。通过数值模拟的手段分析系统性能及其主要影响因素,并优化工作条件。研究表明,与相同工作条件下的单压缩制冷循环相比,复合制冷循环工作日全天候运行时电力性能系数提升约为31.5%,节电优势显著。存在一个最佳的喷射子系统蒸发温度使得复合制冷循环性能系数达到运行工况的最大值。

The combined compression refrigeration with a solar-driven ejector cooling cycle is developed. It is composed of solar collector subsystem, ejector refrigeration subsystem and compression refrigeration subsystem. The combined refrigeration cycle makes full use of the advantages of electric and thermal energy and two kinds of refrigeration methods. At the same time of optimizing the performance of the ejector refrigeration subsystem, the working conditions of the compression subsystem are improved, so as to improve the performance of the combined refrigeration system. It is of practical significance to use high evaporation temperature ejector refrigeration with high performance to remove the exhaust heat of compressor. System performance and its main influencing factors are analyzed by numerical simulation, and its working conditions are optimized. The results show that, compared with the conventional compression refrigeration cycle under the same working conditions, the coefficient performance of the hybrid refrigeration cycle increases by 31.5% in all day working time. The advantage of energy saving is significant. There exists an optimum evaporation temperature of the ejector subsystem, which makes the coefficient of performance and energy saving of the hybrid refrigeration cycle reach the maximum under its operating condition.