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exergy value both at the inlet and outlet of the heat exchanger is called as entropic mean temperature, thermodynamically Variation of Lorenz efficiency with the variation of gas cooler side pressure at three different evaporation temperatures is shown graphically in figure 24. Higher values for Lorenz efficiency were noticed at lower evaporation temperature. One explanation, COPLZ is dependent on mean temperature of CO2 (in the heat rejection process) and on the source temperature, if all the conditions (except evaporation temperature) are maintained then logically COPLZ should have a lower value at low evaporation temperatures. Actual COP of the system is also decreased when operating at low evaporation temperature, however, COPLZ is found to be more sensitive with evaporation temperature so as a result higher values for Lorenz efficiency were found at lower evaporation temperature. Case B Operating conditions Only for tap water heating application (for set point of 50 oC) at varying (-5, 0 and 5 oC) evaporation temperatures with 3RD heat exchanger in operation only. Results 26PDF Image | heat recovery from R744 based refrigeration system
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