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Case D System operation with all three heat exchangers in operation for tap water set temperature of 60 oC and for space heating (30-35 oC) at evaporation temperature of 0 oC. %age difference 4 50% Water 16-60 oC 30-35 oC (space) 3.5 3 2.5 40% 30% 1.5 1 0.5 10% 0% 2 20% COP from compressor data %age difference 0 -10% 7400 7600 7800 8000 8200 8400 Gas cooler pressure (kPa) Figure 41 COP and variation in COP with gas cooler side pressure As can be seen from above figures (37-41), the average deviation in the results from two approaches (direct and indirect mass flow measurement) is in the range from 15-20 %, Furthermore (except case D) maximum deviation was observed either at too high or too low pressure values. Upto 20% deviation can significantly affect the results so it is better to use the average of the two values while presenting the results. It is hard to compare the system performance with other studies as different researchers had used different system configuration for heat sources and for components and different operating conditions as well. Majority of the studies were carried out with counter flow tube in tube type heat exchanger, recently in some studies plate type heat exchangers were also used for the gas cooler. Table 1 summarizes some of the findings from the reviewed literature for performance comparison of our system. 37 COP Compressor data %Age differencePDF Image | heat recovery from R744 based refrigeration system
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