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103 P-h diagram for transcritical co2 cycle 3 41 2 102 101 100 -500 -400 -300 -200 -100 0 h [kJ/kg] Figure 11 P_h and T_s diagram for transcritical vapor compression cycle with R744 Transcritical cycle for the CO2 is shown in figure 12, the transcritical operation (working above and below critical point) is clear in graphical format. At supercritical conditions the pressures and temperatures are not linked anymore and CO2 behaves as gas. The conventional condensation process in subcritical cycles is thus replaced with gas cooling process (so the condenser is called gas cooler). Gas cooling process is sensible cooling process (gliding temperature change), so heat can rejected over a large temperature difference and is well suited for applications where high temperature lift is required. One important application area for the transcritical cycle is water heating (for tap water heating and space heating). The maximum achievable temperature (for the hot water) in conventional subcritical cycle is limited by the condensation temperature (and hence pressure as well), to fulfill high temperature applications the condensation pressure has to be increased (more compressor work) which will lower the overall COP of the system. Figure 12 T_Q diagrams for water heating application 10 P [bar]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
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