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Figure 26 T_h diagram for 3rd heat exchanger Temperature enthalpy diagram for this case is shown in figure 26 Compared to case A the two curves (cooling curve for CO2 and heating curve for water) are a bit far from each other, means more energy losses and less efficient heating process. Lorenz efficiency with gas cooler pressure 45% 40% 35% 30% 25% 20% 15% 10% 5% Water 19-50 oC 0% 7500 8000 8500 9000 9500 Gas cooler pressure (kPa) Lorenz efficiency at 0C evaporation Lorenz efficiency at -5C evaporation Lorenz efficiency at 5C evaporation Figure 27 Variation of Lorenz efficiency with gas cooler pressure Variation of Lorenz efficiency is shown in figure 27, similar trend (higher values for Lorenz efficiency at -5OC) as that for 1st heat exchanger was observed in this case. Case C Part 1 Only for tap water heating (set point temperature of 55, 60 and 65 oC) at evaporation temperature of 0 oC with heat exchanger No 1 and 3 in operation. 28 EfficiencyPDF Image | heat recovery from R744 based refrigeration system
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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