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Figure 31 T_h diagram (1st and 3rd heater in operation) Temperature enthalpy diagram in figure 31 shows water heating process in 1st (Ta to Tc) and 3rd (Tc to Td) heat exchanger. Lorenz efficiency with gas cooler pressure 60% 50% 40% 30% 20% 10% 0% 7500 8000 8500 9000 9500 Gas cooler side pressure (kPa) Lorenz efficiency at 0C evaporation Lorenz efficiency at -5C evaporation Lorenz efficiency at 5C evaporation Water 16-60 oC Figure 32 Variation of Lorenz efficiency with gas cooler pressure As shown earlier for one specific test point if all the other conditions are maintained and evaporation temperature is varied then minimum Lorenz efficiency was observed at highest evaporation (source) temperature. The same trend is shown graphically in figure 32 for the case when 1st and 3rd heat exchanger were in operation. 31 Lorenz efficiencyPDF Image | heat recovery from R744 based refrigeration system
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