PDF Publication Title:
Text from PDF Page: 019
Figure 7 Pressure temperature diagram for CO2 Figure 7 shows the pressure temperature diagrams for CO2, various phases of CO2 with the variation of pressure and temperature are shown. At low pressure and temperature it exists in the form of dry ice while at high pressure and temperatures the fluid is in supercritical form. 105 104 103 2 10 -500 R744 150 125 100 75 50 25 0 -25 -50 -75 -2.25 -2.00 -1.75 -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 0.00 T-s diagram for R744 0.2 0.4 5700 kPa 3400 kPa 1800 kPa 910 kPa 0.6 0.8 15.5°C 1.23°C -11.8°C -25°C 0.2 0.4 0.6 0.8 -400 -300 -200 h [kJ/kg] -100 0 100 Figure 8 P_h and T_s diagram for R744 Figure 8 shows the thermophysical properties of CO2 in the form of pressure enthalpy and temperature entropy diagrams. Triple point (5.2 bars, -56.4oC) is the point where all the three phases (solid, liquid and vapor) can coexist while the critical point (73.8 bars and 31.1 oC) is the point where there is no difference in liquid and vapor density. The critical pressure for CO2 is quite high while critical temperature is quite low as compared with conventional refrigerants and it is the low critical temperature that makes the heat transfer difficult in the heat sink area while operating in conventional subcritical fashion, so operating cycle has to be modified a bit to widen the operating domain and fulfill various applications. s [kJ/kg-K] 7 0.0017 0.0057 0.01 0.019 0.034 -1 0.063 m3/kg -0.9 -0.8 -0.7 -0.6 kJ/kg-K P [kPa] T [°C]PDF Image | heat recovery from R744 based refrigeration system
PDF Search Title:
heat recovery from R744 based refrigeration systemOriginal File Name Searched:
r744-heat-recovery.pdfDIY PDF Search: Google It | Yahoo | Bing
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
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)