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Figure 9 CO2 as refrigerant, usage history [4] Figure 9 shows the early rise, decline and then revival in the usage of CO2 in twentieth century. 2.3 CO2 Transcritical cycle The operating cycle with CO2 is simple vapor compression cycle however when working with CO2, the low critical temperature limits the heat transfer process across the heat sink area. To facilitate the heat transfer from CO2 across the heat sink, system has to be operated at above critical conditions (31.1 oC and 73.8 bars). The resulting operating cycle will be called as transcritical cycle, with supercritical conditions for CO2 across the heat sink and subcritical conditions for CO2 across the heat source. Transcritical cycle was proposed for air conditioning and heat pump applications by Prof. Gustav Lorentzen. 102 101 100 10-1 -50 0 50 100 150 200 250 300 h [kJ/kg] 102 120 90 T-S diagram for actual vapor compression cycle 4 5 2S 2 3 1 P-h diagram for actual vapor compression cycle 4 5 3 2s 2 1 101 60 30 100 0 -30 10-1 -60 -0.25 0.00 0.25 0.50 0.75 1.00 s [kJ/kg-K] Figure 10 P_h and T_s diagram for subcritical vapor compression cycle 9 P [bar] T [°C]PDF 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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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