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CHAPTER 2: LITERA TURE STUDY 44 heating COP and compressor shaft power vary with the compressor discharge pressure. The heating capacity tends to increase steeply in the beginning but as the discharge pressure increases the heating capacity evens out. The compressor shaft power increases linearly as the discharge pressure increases. The heating COP of a system is determined by the ratio of the heating capacity and the power input with the maximum COP found as indicated on Figure 2.28. It could also be seen that the COP evens out a little around its optimum area (Neksa, 2006). Therefore the maximum COP of a system is said to be around discharge pressures of 90 110 bar depending on the surrounding conditions. When operating in a subcritical state, the COP is dependent on the heat sink temperature. Figure 2.28: Variation of discharge pressure and the effect thereof (Neksa et aI., 1998). r~--150 ~ t.......J ~'" (l) 40 " ::> 0 P-1PDF Image | CO2 HEAT PUMP Analysis
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