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5 – Experimental Results the compressor also affected the maximum COP, since the optimum high- side pressure rose by about 0.5 MPa when the set-point for the hot water temperature was increased from 60 to 80oC. The set-point for the hot water temperature had a significant impact on the DHW heating capacity ratio. This is demonstrated in Figure 5.10, where the heat rejection process in the tripartite gas cooler is displayed in T-Q diagrams at optimum high-side pressures, 60 and 80oC hot water tempera- tures and 35/30oC supply/return temperatures for the space heating system. 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa SH: 35/30oC DHW: 80oC A C B COP 3.44 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.5 MPa SH: 35/30oC DHW: 60oC A C B COP 3.89 Figure 5.10 Illustration of the heat transfer process in the tripartite gas cooler in the combined mode at optimum high-side pressures, 35/30oC supply/return temperatures for the SH system and 60°C and 80oC DHW temperatures. According to Figure 5.10, the optimum high-side pressure rose from 8.5 to 9.0 MPa when the hot water temperature was increased from 60 to 80oC, and the water flow rate in the hot water circuit had to be reduced by nearly 55%. As a result the heating capacity of the DHW preheating (A) and re- heating (C) gas coolers dropped off by approximately 14%, whereas the heating capacity of the space heating gas cooler (B) increased by 22% due to the higher average temperature difference. All in all the elevated set- point temperature reduced the DHW heating capacity ratio from 57 to 39%. Figure 5.11 shows the measured maximum COP as a function of the DHW heating capacity ratio at varying supply/return temperatures for the space heating system and varying set-point temperature for the hot water system. At 33/28, 35/30 and 40/35oC supply/return temperatures in the space heating system, the DHW heating capacity ratio dropped by approximately 18 percentage points when the set-point temperature for the hot water was increased from 60 to 80oC. 122 Temperature [°C] Temperature [°C]PDF Image | Residential CO2 Heat Pump System for Combined
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