太阳能喷射-压缩复迭制冷系统的性能分析

以热力学第一定律和热力学第二定律为基础,建立太阳能喷射-压缩复迭制冷系统的分析和能量分析模型,分析发生温度、中间温度、冷凝温度和蒸发温度等运行参数对系统性能的影响,选取对系统最佳的运行参数.结果表明:发生温度升高,性能系数(COP)小幅度下降,效率先增加后趋于平缓;中间温度升高,COP随之减小,而效率随之增加;冷凝温度上升,导致COP和效率随之降低;蒸发温度上升,导致COP和效率随之增加;当发生温度为85 ℃,中间温度为24 ℃时,系统的性能最优.

Performance Analysis of Solar Ejector-Compression Refrigeration System

Based on the first law of thermodynamics and the second law of thermodynamics, the exergy analysis and energy analysis model of the solar ejector-compression refrigeration system was set up, and the influences of the operating parameters of generating temperature, medium temperature, condensing temperature and evaporating temperature on the system performance were analyzed. Through the analysis, the results show that the coefficient of performance(COP)decreases slightly, and the exergy efficiency rises in the beginning and then tends to be stable along with the generating temperature increasing. COP decreases and the exergy efficiency rises with the increment of the medium temperature. Besides, both COP and the exergy efficiency decrease when the condensing temperature increases, while rise when the evaporating temperature increases. Moreover, the optimum performance is obtained when the generating temperature is 85 ℃, and the medium temperature is 24 ℃.