基于分析的太阳能喷射制冷系统运行参数优化

Optimization of Operating Parameters of a Solar Ejector Refrigeration System on Exergy Analysis

分析是用来分析制冷系统性能的一种工具。本文分析基于下列假设:太阳辐射为750W/m2,制冷量为10 kW,采用R141b作制冷剂,周围环境温度为31℃。对太阳能喷射制冷系统分析结果表明,不可逆损失产生于各个部件,随运行温度而变化。其他条件不变时,系统效率随着蒸发温度的升高而升高,随着冷凝温度的升高而降低。在一定的蒸发、冷凝温度下,火用效率最大时,可以得到最佳发生温度。

Exergy analysis is used as a tool to analyze the performance of a refrigeration cycle. The analysis is based on the following conditions： a solar radiation of 750 W/m^2, a cooling capacity of 10 kW, R141b as the refrigerant in the refrigeration cycle and ambient temperature of 31 ℃as the reference temperature. The exergy analysis results of the solar ejector refrigeration system show that irreversibilities occur among all components and depend on the operating temperatures. The exergy efficiency increases with the condensation temperature decreasing or the evaporation temperature increasing. The optimum generating temperature is obtained for a specific evaporation temperature and a specific condensation temperature when the system exergy efficiency is maximized.