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Dynamic Modelling and Validation of an Air-to-Water Reversible R744

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Dynamic Modelling and Validation of an Air-to-Water Reversible R744 ( dynamic-modelling-and-validation-an-air-to-water-reversible- )

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Energies 2021, 14, 8238 21 of 25 Figure 15. Trend of evaporation pressure during the dynamic simulation. As presented in Figure 16, the numerical model demonstrated that, during DHW production, the heat pump presented a higher COP even if the mean pressure ratio between high pressure and evaporation pressure was higher than the one during SH production. The benefit is of course related to the low water temperature at the gas cooler inlet, which results in a higher useful heat flow rate at the gas-cooler. The mean values of high-pressure, evaporation pressure, water mass flow rate developed by the variable speed pump, gas- cooler heat flow rate, and COP during DHW and SH production are presented in Table 11. Figure 16. Trend of COP during the dynamic simulation.

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Dynamic Modelling and Validation of an Air-to-Water Reversible R744

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