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采用有限时间热力学理论和(火积)理论对一类存在热漏和高温热源热容有限的两热源热机进行研究.寻求模型符合牛顿传热定律时,系统在给定循环周期下系统熵产生最小和(火积)损失最大时的最优构型,并与系统输出功最大时的最优构型对比.分析结果表明:对于无限热容高温热源,热漏是否存在并不改变循环的最优构型;而对于有限热容高温热源,以系统熵产生最小和(火积)损失最大为目标的最优构型与以系统输出功最大为目标的最优构型不完全相同,无热漏时分别以熵产生最小、(火积)损失最大和输出功最大为目标的最优构型均相同,而存在热漏时分别以三者为目标时的最优构型各不相同.
The finite difference thermodynamics theory and (fire product) theory are used to study a class of two heat source heat engines with limited heat capacity of heat leak and high temperature heat source. When the model is in accordance with Newton’s law of heat transfer, the system entropy produces the smallest entropy And the optimal configuration at the time of maximum loss of product, and compares it with the optimal configuration at the maximum output power of the system.The analysis results show that the presence or absence of heat leak does not change the optimal circulation for an infinite heat capacity high temperature heat source For the finite heat capacity high temperature heat source, the optimal configuration with the minimum entropy production (maximum) and maximum loss (fire product) as the target is not exactly the same as the optimal configuration with the maximum output power of the system, Respectively, the optimal configurations with the lowest entropy, the highest (loss of product) and the largest output power are all the same, while the optimal configurations with the three targets as the hot leaks are all different.