太阳能喷射式制冷系统热力学分析

Thermodynamic Analysis of Solar Ejector Refrigeration System

利用热力学第一定律和热力学第二定律对太阳能喷射式制冷系统进行分析。研究太阳能喷射式制冷系统的喷射系数和性能系数随蒸发温度、冷凝温度、发生温度等工作参数的变化趋势,分析工作参数的变化对系统中各个部分熵产的影响,进而确定系统性能最优时的工作参数。结果表明,系统的制冷性能系数随着蒸发温度的升高而增大,总熵产随着蒸发温度的升高而减小,所以适当提高蒸发温度和冷凝温度对提高系统的整体性能有利。在研究工况下,蒸发温度和冷凝温度一定时,存在一个使系统的总熵产最小的发生温度。

The first law of thermodynamics and the second law of thermodynamics are used for solar ejector refrigeration system.The jet coefficient and the performance coefficient of solar jet ejector refrigeration system changing with the operating parameters such as evaporation temperature,condensation temperature,and generation temperature are researched,parameters affection on the various parts of the system entropy production is analyzed,and then operating parameters are determined in condition of the best system performance.The results show that the coefficient of performance is increased with the increase of evaporation temperature,the total entropy production is decreased with the increase of the evaporation temperature,they have opposite change with the condensing temperature compared to evaporating temperature,so that an appropriate increase evaporating temperature and condensing temperature is benefit to improve overall system performance; when evaporating temperature and the condensing temperature is certain,there is an optimum generation temperature to minimize the total entropy production.