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COP and heating capacity with gas cooler 4 side pressure 30 3.5 3 2.5 2 1.5 1 0.5 25 20 15 10 5 00 7000 7500 8000 8500 9000 9500 Gas cooler pressure (kPa) COP at 55C COP at 60 C COP at 65C Q at 55 Q at 65 Q at 60 Figure 28 Variation of COP and heating capacity with gas cooler pressure and set point temperature Series connection of first and third heat exchanger was employed in this case for tap water heating, three different set points were used to see the system performance with varying set point temperatures. Figure 28 shows the variation of the coefficient of performance of the heat pump system with the variation of set point temperature for hot water and gas cooler side pressure. For each set point there seems to be one optimum pressure value which corresponds to maximum achievable COP, the optimum pressure shifts to a higher value as set point temperature is increased (from 55 to 60 oC). Furthermore as the set point temperature is increased from 60 to 65 oC COP is decreased by about 10%. Lorenz efficiency with gas cooler pressure 60% 50% 40% 30% 20% 10% 0% 7000 7500 8000 8500 9000 9500 Gas cooler side pressure (kPa) Water 16-60 oC Lorenz efficiency at set point 55C Lorenz efficiency at set point 65C Lorenz efficiency at set point 60C Figure 29 Variation of Lorenz efficiency with gas cooler pressure 29 Lorenz efficiency COP Heating capacity (KW)PDF Image | heat recovery from R744 based refrigeration system
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