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CHAPTER LITERATURE STUDY 18 CO:! Solid ,\~e -&,0;;:" 0l-~'l> S-S Sublimation Point Triple Point CO:!Uquid C02 Vapour Copyright 1999© ChemlcaLogic Corporation Dra\'l!J with CO2 Tab V1.0 -20 -10 0 10 20 30 40 50 Temperature eq Figure 2.4: Phase Diagram (Freund, s.a.). Carbon dioxlde: Temperature - pressure diagram CO2 has a much higher vapour pressure and volumetric refrigeration capacity than conventional fluids. Its volumetric capacity is 22,545kJ/m3 at aoc which is between 3 and 1atimes higher compared to other fluids. The critical pressure and temperature for CO2 is 73.8 bar and 31.1 °C respectively, the pressure is very high compared to conventional systems. Therefore the operating pressure in the system will be 5 to 2a times higher than conventional systems. This is illustrated in figure 2.5, which compares the pressure-enthalpy diagrams of CO2 and HFC-134a. Above its critical point it is impossible for CO2 to transfer heat to ambient conditions by condensation as in conventional vapour compression cycles. The heat transfer process for carbon dioxide takes place through gas cooling and this results in a system to be known as a transcritical system. In the supercritical region the high side pressure and temperatures are not connected and could be regulated independently to attain an optimum operating condition. From the phase diagram shown in Figure 2.4 it could be seen that the temperature and pressure for the triple point is at -56.6°C and 5.2 bar respectively and its saturation at aoc is at 35 bar. The triple point is known as the pressure temperature combination at which carbon dioxide can exist simultaneously in its three states. If A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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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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