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利用有限时间热力学分析了变温热源制冷循环性能,计入了工质与高低温侧换热器的热阻损失,热源之间的热漏损失及工质内部耗散的不可逆损失。在给定制冷率条件下,推导出最大性能系数和高低温侧循环工质温度的解析式,通过数值计算,分析了各不可逆损失对循环性能的影响。
The finite element time-dependent thermodynamic analysis was used to analyze the refrigeration cycle performance of the variable temperature heat source, including the thermal resistance loss of the working fluid and the heat exchanger on the high and low temperature side, the heat leakage loss between the heat sources and the irreversible loss of the internal dissipation of the working fluid. Under the condition of given cooling rate, the analytic formula of the maximum performance coefficient and the temperature of high and low temperature side working fluid was deduced. By numerical calculation, the influence of each irreversible loss on the cycle performance was analyzed.