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Figure 5.30 The measured COP in the DHW mode as a function of the temperature approach at varying DHW temperature. 5 – Experimental Results 4.0 3.5 3.0 2.5 0 5 10 15 20 25 30 Temperature Approach [K] 60°C 70°C 80°C 30 25 20 15 10 5 0 60°C 70°C 80°C 8.0 8.5 9.0 9.5 10.0 10.5 11.0 Gas Cooler Pressure [MPa] Figure 5.31 The measured temperature approach as a function of the high-side pressure at varying DHW temperature. The maximum COPs at 60 and 70oC hot water temperature were measured at approximately 9 and 10 MPa high-side pressure, respectively. At high- side pressures below the optimum values, there was virtually a linear relationship between the COP and the temperature approach as well as between the temperature approach and the high-side pressure. On the other hand, there was only a marginal reduction in the temperature approach when the high-side pressure was increased above the optimum level. By analysing the results in Figure 5.30, it is most likely that the optimum high-side pressure for the 80oC measuring series was above 11 MPa, and that the corresponding temperature approach was around 5 K. 137 Temperature Approach [K] COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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