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CHAPTER 2: LITERA TURE STUDY 48 - - - - - - - - ...- - ..- - . - - - - Figure 2.32: Instant hot water supply heat pump (Endoh et al., 2006). Experiments done by Kuwabara et al. (2006) showed that the higher the gas cooler inlet temperature or the lower the air temperature was, the lower the COP and heating capacity. were as a result, although the water outlet temperature was reasonably unaffected by these changes. Figure 2.33 shows the P-h diagram for a CO2 heat pump cycle with different water inlet temperatures. From the diagram it can be seen that as the water inlet temperature is increased the compressor discharge pressure will be higher. The effect on the gas cooler directly affects the system COP. As the water inlet temperature is higher so will the gas cooler outlet temperature be higher which plays a role in the COP of the system (Kuwabara et al., 2006). According to Huff and Sienel (2006), eight commercial-sized CO2 heat pump water heaters have been developed and installed in the North American market under diverse conditions. These systems have already been working for over 8000 hours. From the performance results obtained, a considerable benefit over conventional systems was showed as the CO2 systems provided between US$4000 and US$10000 saving in annual energy cost compared to the other refrigerants used. A Techno-Economical Analysis of a CO2 Heat Pump. School of Mechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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