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通过热力学推导,给出了基于Jacob数和蒸发冷凝温度之比来预测理想非共沸工质有机循环热效率和输出功的理论公式,同时与利用Matlab编程计算的数值计算模型进行了对比.同时以空气作为热源,采用水冷的方式,以R227ea/R245ca作为工质,研究了不同的冷却水温升和冷却水进口温度对其不同质量分数下的输出功的影响.结果发现,当冷却水温升小于工质的温度滑移时,二者相等时存在输出功的当地最大值;当冷却水温升大于工质的温度滑移时,温度滑移最大时存在输出功的最大值。在相同的冷却水温升下,冷却水的进口温度越低,工质相同质量分数下输出功越高,同时最大输出功对应的工质质量分数不变。
Based on the derivation of thermodynamics, the theoretical formula for predicting the organic cycle thermal efficiency and output work of an ideal non-azeotropic working fluid based on the ratio of Jacobian to evaporative condensation temperature is given and compared with the numerical calculation model which is programmed and calculated by Matlab Air as a heat source, using water-cooled way to R227ea / R245ca as a working fluid to study the different cooling water temperature and cooling water inlet temperature on its different mass fraction of output work. The results showed that when the cooling water temperature rise When the temperature slip is less than the working fluid temperature, the local maximum of the work output exists when the two are equal. When the temperature of the cooling water is greater than the temperature slip of the working fluid, the maximum output power exists when the temperature slip is maximum. Under the same cooling water temperature rise, the lower the inlet temperature of the cooling water, the higher the output work under the same mass fraction of the working fluid and the same mass fraction of the working fluid corresponding to the maximum output work.