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7 – Discussion and Analysis 1,0 0,8 0,6 0,4 0,2 0,0 DHW-preheating DHW-reheating Space heating Figure 7.2 The measured relative heating capacity for the three gas cooler units at optimum high-side pressure and varying temperature levels in the SH and DHW systems. As described in Section 2.2, Heating Demands in Houses, the annual DHW demand typically constitutes 10 to 15% of the total heating demand in existing residences and about 20 to 45% in new houses and so-called low-energy houses. Consequently, in order to obtain a high COP and at the same time limit the DHW heating capacity ratio for an integrated CO2 heat pump, the return temperature for the SH system should be as low as possible. 7.1.2.4 The COP vs. the Thermodynamic Losses in the DHW Tank The COP vs. the Inlet Water Temperature The inlet water temperature for the DHW preheating gas cooler will have a significant impact on the COP for an integrated CO2 heat pump unit during operation in the combined mode and DHW mode, since it governs the maximum possible cool-down of the CO2 in the DHW preheating gas cooler unit (ref. Section 6.1.4.3, The Effect of the Inlet Water Tempera- ture). The simulation results regarding the impact of the inlet water temperature on the COP of the prototype CO2 heat pump unit can be summarized as follows: 211 Relative Heating Capacity [-] 60°C, 33/28°C 60°C, 35/30°C 60°C, 40/35°C 70°C, 33/28°C 70°C, 35/30°C 70°C, 40/35°C 80°C, 33/28°C 80°C, 35/30°C 80°C, 40/35°CPDF Image | Residential CO2 Heat Pump System for Combined
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