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5 – Experimental Results 5.1.3.2 Simultaneous Space and Hot Water Heating The Maximum COP vs. the Optimum High-Side Pressure For each measuring series at fixed set-point temperatures for the space heating and hot water systems, there was a maximum COP that corres- ponded to an optimum gas cooler (high-side) pressure (ref. Appendix A2.4). This is demonstrated in Figure 5.4, where the heating capacity of the tripartite gas cooler (QGC), the power input to the compressor (PC) and the COP of the heat pump are shown as a function of the high-side pressure. For the selected measuring series, the evaporation temperature was -5oC (3.046 MPa), and the set-point temperatures for the space heating and hot water system were 35/30oC and 60oC, respectively. 4.0 3.5 3.0 2.5 7.5 COPmax 8 6 4 2 0 TDHW: 60°C TSH: 35/30°C COP QGC popt 8.5 PC 8.0 9.0 Gas Cooler Pressure [MPa] Figure 5.4 The measured heating capacity of the gas cooler (QGC), the compressor power input (PC) and the COP at varying gas cooler (high-side) pressure in the combined mode. Whereas the power input to the compressor was virtually proportional to the high-side pressure, there was a significant change in the heating capacity of the tripartite gas cooler when the pressure was gradually increased from 7.5 to 9.0 MPa. This is further demonstrated in Figure 5.5, where the heat rejection process in the tripartite gas cooler for the selected test series is displayed by means of T-Q diagrams. An overview of the power input to the compressor, the heating capacities for the three gas cooler units as well as selected temperatures for the heat rejection process is presented in Table 5.1. 117 COP [-] Power - Heating Capacity [kW]PDF Image | Residential CO2 Heat Pump System for Combined
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