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5 – Experimental Results Figure 5.33 shows that the relative heating capacities for the two gas cooler units were identical at optimum high-side pressure and varying set- point temperature for the hot water. 1.0 0.8 0.6 0.4 0.2 0.0 0.32 0.32 0.68 0.68 60°C 70°C DHW-preheating DHW-reheating Figure 5.33 The measured relative heating capacity for the gas cooler units in the DHW mode at optimum high-side pressure and varying DHW temperature. Although the heat transfer surface of the DHW preheating gas cooler unit was nearly 5 times larger than that of the DHW reheating gas cooler unit, the heating capacity of the latter at optimum high-side pressure constituted about 30% of the total heating capacity. According to Figure 5.27, this was mainly due to a larger average temperature difference. 5.1.3.4 Space Heating Only The Maximum COP vs. the Optimum High-Side Pressure During testing in the space heating mode (SH mode), there was no water flow in the hot water circuit, and the supercritical CO2 passed through the DHW reheating gas cooler before it entered the space heating gas cooler. For each measuring series with fixed supply/return temperatures for the space heating system, there was a maximum COP that corresponded to an optimum high-side pressure. This is demonstrated in Figure 5.34, where the heat rejection process in the two gas cooler units is displayed by means of T-Q diagrams. For the selected measuring series, the evapora- tion temperature was -5oC and the supply/return temperatures in the space heating system were 35/30oC. 139 Relative Heating Capacity [-]PDF Image | Residential CO2 Heat Pump System for Combined
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