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Case D Heat pump operation with set point temperature of 60 oC for tap water and (30-35 oC) for space heating with all the three heat exchangers in operation. 4 3.5 3 2.5 2 1.5 1 0.5 25 20 15 10 5 COP and Heating capacity Water 16-60 oC 30-35 oC (space) 00 7400 7600 7800 8000 8200 8400 Gas cooler side pressure (kPa) COP direct reading Heating capacity in Hex 1 + 3 Heat gained in 2nd HEx Figure 33 Variation of COP and heating capacity with gas cooler side pressure Variation of heating capacity and COP with the variation of high side pressure is shown in figure 33 for the specific case when all the three heat exchangers were in operation. Results shown are associated with the water temperature of 30/35 oC in the second heat exchanger. It was hard to achieve high pressures across the gas cooler when water inlet temperature to the 2nd heat exchanger was low. 32 COP Heating capacity (kW)PDF Image | heat recovery from R744 based refrigeration system
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