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CHAPTER 2: LITERA TURE STUDY 49 16 14 12 ~10 2! e8 :J tJj gs ' 0... 6 4 2 0 Gascooler Outlet ColTpressor Dscharge -----> eXJ ffi) 700 750 800 Enthalpy [kJ! kg] Figure 2.33: P-h diagram of CO2 heat pump cycle (Kuwabara et at., 2006). 39"C The pinch point, which is the smallest temperature difference to be reached in a heat exchanger between the refrigerant and the secondary fluid, occurs at the outlet of the gas cooler because of the temperature glide that occurs. Therefore it is able to cool the refrigerant to the lowest possible temperature before entering the expansion device. It also means that the water entering the gas cooler could be close to the temperature at which the refrigerant is leaving the gas cooler (Huff & Sienel, 2006). In conclusion it could be seen that CO2 has great potential to be used as a refrigerant for future refrigeration and heating systems. From the literature study one is able to see that the properties of CO2 are to its advantage when used as a refrigerant. The disadvantages of CO2 are relatively easy to overcome. Therefore CO2 will make a feasible replacement as a natural refrigerant. A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West University Rejected HeatPDF 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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