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Chapter No 3 3.1 System performance Evaluation 3.1.1 Coefficient of Performance (COP) Performance of a refrigerating machine (be it a refrigerator or a heat pump) is measured by its coefficient of performance (COP), this COP gives the information about how effectively that machine is utilizing the supplied energy. As in this specific case we are dealing with CO2 heat pump, the objective is to recover maximum heat from the CO2 in the gas cooler by circulating water and mechanical work is supplied as input to compressor to operate the system. The COP is defined as follows, From second law of thermodynamics the COP of any reversible system operating between two temperature limits is exactly same and completely independent of the involved refrigerant, however these are the physical properties of the refrigerants that affect the system power consumption through their influence on the thermodynamic losses. Figure 14 shows one specific case with CO2 where heat was rejected initially at 95 bars from 100 oC (point 2) to 40 oC (point 3) and evaporation temperature was fixed at 0 oC, the COP for the heat pump was 2.7. If the heat could be rejected down to 25 oC while maintaining the same evaporation temperature the COP can be improved up to a value of 3.4. So in order to have a high COP from a CO2 heat pump, the heat has to be rejected over a larger temperature range. 15PDF Image | heat recovery from R744 based refrigeration system
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