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CHAPTER 2: LITERA TURE STUDY installed) from the evaporator (Kern aL, 2006). According to Aprea and Maiorino (2008), the thermodynamic efficiency of a CO2 system could be improved by implementing an internal heat exchanger. The specific volume of the refrigerant vapour entering the compressor increases and thus increases specific compressor work too. Figure 2.31 shows the difference in operating pressures between a transcritical and subcritical system. Here the big difference between the two operating cycles can be seen. Figure 2.31: Comparison of transcritical cycle to subcritical cycle. (Endoh et ai, 2006). According to Wolf aL (2006), Japan plans to have 5.2 million CO2 hot water heat pumps installed by 2010. Endoh et af. (2006) developed a CO2 heat pump that gives instant hot water. CO2 systems developed before this one used storage tanks of up to 300-480L capacity and were constantly kept at temperature by means of a 4.5 6kW heat pump system. Endoh's heat pump supplies the hot water at exactly the required temperature. To realize this they had to develop a 23kW heat pump system. They included a support tank that has a capacity of 45L and so doing, combined the heat pump and storage tank into a single unit. A picture of this heat pump is given in Figure 2.32. The system has a COP of 4.6 rated at water inlet and outlet temperatures of 12°C and 42°C respectively and with dry bulb and wet bulb temperatures of 16°C and 12°C respectively (Endoh a/., 2006). A Techno-Economical Analysis of a COl 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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