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6 – Modelling Simultaneous Space Heating and Hot Water Heating (Combined Mode) Figure 6.16 shows the simulated relative COP for the prototype CO2 heat pump unit in the combined mode at varying inlet water temperature. The supply/return temperature for the space heating system was 35/30 or 40/35°C, the hot water temperature was 60 or 80°C and the high-side pressure for each series was kept constant at the measured optimum high- side pressure. The COP of the CO2 heat pump unit at 5oC inlet water temperature was used as the reference (i.e. COPrel=1.0). 1.00 0.95 0.90 0.85 0.80 0.75 0.70 35/30-80°C 40/35-80°C 35/30-60°C 40/35-60°C 5 10 15 20 25 30 Inlet Water Temperature [°C] Figure 6.16 The simulated relative COP in the Combined heating mode as a function of the inlet water temperature and varying set-point temperatures for the SH and DHW systems. Figure 6.16 clearly demonstrates that the COP was very sensitive to varia- tions in the inlet water temperature. As an example, by increasing the inlet water temperature from 5 to 10oC, the COP dropped off by about 5% at 35/30oC supply/return temperature and 60oC hot water temperature, whereas the COP was reduced by 14 and 24% at 20 and 30oC inlet water temperature, respectively. At 80oC hot water temperature the relative COP for the CO2 heat pump unit was less influenced by variations in the inlet water temperature due to the considerably lower water flow rate in the hot water circuit. Hot Water Heating Only (DHW Mode) Figure 6.17 shows the simulated relative COP for the integrated CO2 heat pump unit in the DHW mode at varying inlet water temperature and 60 and 80oC hot water temperature. 190 Relative COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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