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CHAPTER LITERATURB STUDY 27 Figure 2.16: COP of a transcritical CO2 heat pump as a function of the CO2 outlet temperature from the gas cooler and the evaporation temperature (Stene, 2007). 5~~--~------~------~----~------~----~------~ 4 -r-- _____ 1- _I- _____ T-:I"_ _ _ a.. 3 oIII ()1 II II 11111 _____L __L _____L ___L_____L 2 111 1I IIII Variable evaporation temperature I 1 5 10 15 20 25 30 35 40 CO2 Outlet Temperature [OC] From Figure 2.16 it could be seen that the COP of the heat pump system is dependent on the evaporating and also the gas cooler outlet temperature. Studies made by Stene (2007) show that for a higher gas cooler outlet temperature the lower the COP will be, but for a higher evaporating temperature, the higher the COP will be. The heating capacity and COP of a transcritical CO2 heat pump system are affected by the high-side pressure. Figure 2.17 illustrates the transcritical cycle in a temperature-enthalpy diagram for high-side pressures ranging from 8 to 11 MPa. The evaporating temperature was kept constant at and the gas cooler outlet temperature was kept constant at 35°C. It could be seen that the inlet enthalpy to the gas cooler increases and the outlet enthalpy decreases as the high-side pressure increases. The change of enthalpy due to the change in temperature is not proportional to the change in specific compressor work and for each fixed outlet temperature from the gas cooler there will be an optimum high-side pressure leading to a maximum COP (Stene, 2007). A Techno-Economical Analysis ofa COl Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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