Fig. 6: The comparison of COP improvement of flexible heat pump cycle and various two stage cycle layouts. | Communications Engineering

Fig. 6: The comparison of COP improvement of flexible heat pump cycle and various two stage cycle layouts.

From: A unified approach for the thermodynamic comparison of heat pump cycles

Fig. 6

In all cases, the condensing temperature and evaporating temperature are kept at 65 °C and 0 °C, respectively, while the intermediate temperature is selected as the optimal temperature for each refrigerant according to Fig. 3. Three typical refrigerants are tested: (a) R717; (b) R32; (c) R1234ze.

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