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3.5 3 2.5 2 1.5 1 0.5 25 20 15 10 5 COP and heating capacity Water 19/50 oC 00 7000 7500 8000 8500 9000 9500 Gas cooler side pressure (kPa) COP at 0C evaporation COP at 5C evaporation Heating capacity at 5C evaporation COP at -5C evaporation Heating capacity at 0C evaporation Heating capacity at-5C evaporation Figure 25 COP and heating capacity variation with gas cooler side pressure Compared with first heat exchanger less heat transfer area is available in third heat exchanger, water flow needs to be regulated (compared with case A) to reach the same set point of 60 oC, furthermore CO2 leaves the gas cooler at higher temperature (as less heat is recovered from it) and in this way eventually affect the operating pressure in the system. So to avoid all such practical complications water set point of 50 oC was used in this specific case. Variation of COP and heating capacity with gas cooler side pressure variation at three different evaporation temperatures is shown in figure 25, trend is similar like the first heat exchanger, the heating capacity and COP increases with the increase in evaporation temperature. 27 Heating capacity (kW) COPPDF Image | heat recovery from R744 based refrigeration system
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