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The virtually constant inlet and outlet CO2 temperatures for the space heating gas cooler are illustrated in Figure 5.26, where the heat rejection process in the tripartite gas cooler is displayed by means of T-Q diagrams at 33/28oC supply/return temperatures for the space heating system and 70oC hot water temperature. 5 – Experimental Results 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.0 MPa SH: 33/28oC DHW: 70oC T3 29,2 20,4 82,2 T2 49,5 29,2 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.5 MPa SH: 33/28oC DHW: 70oC T3 28,2 15,8 87,3 T2 48,3 28,3 Max. COP 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.5 MPa SH: 33/28oC DHW: 70oC T3 28,0 10,1 97,4 T2 48,5 26,2 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa SH: 33/28oC DHW: 70oC T3 28,1 12,4 92,7 T2 48,5 27,5 Figure 5.26 The heat transfer process for the tripartite gas cooler in the combined mode illustrated in T-Q diagrams at varying high-side pressure. The supply/return temperatures and the DHW temperature was 33/28oC and 70oC. The outlet CO2 temperature T3 from the space heating gas cooler was limited by the return temperature in the space heating system. Due to the relatively large heat transfer surface and the excellent heat transfer condi- tions, the temperature approach was small and the CO2 outlet temperature remained virtually constant when the high-side pressure was increased. Since the CO2 mass flow rate was virtually constant and the set-point temperatures for the space heating and hot water systems were set at 33 and 70°C, respectively, the outlet CO2 temperature T2 from the DHW 133 Temperature [°C] Temperature [°C] Temperature [°C] Temperature [°C]PDF Image | Residential CO2 Heat Pump System for Combined
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