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COP and heating capacity 3.5 30 3 2.5 2 1.5 1 0.5 25 20 15 10 5 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 22 COP and heating capacity with the variation of gas cooler side pressure Most of the observations were recorded during the summer period, temperature of the city water was varying with the ambient temperature (in the range from 15-20 oC). Most of the previous and current studies utilized tap water temperature of 60 oC, so we also tried to achieve the same set temperature so the system performance can be compared under similar operating conditions. From the graph it is clear that heating capacity and COP increases with the increase in evaporation temperature, however, first heat exchanger is one part of whole gas cooler so maximum achievable heating capacity and hence COP of the system is limited by the geometrical constraints (I-e available heat transfer area). Heating capacity seems to have negligible variation with the variation in the evaporation temperature however COP of the system is sensitive to the evaporation temperature due to variation in compressor power consumption (due to variation in pressure ratio). 24 Heating capacity (kW) COPPDF Image | heat recovery from R744 based refrigeration system
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