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CHAP1ER 4: COMPARlSON BET\VEEN R-22 AND CO2 SYS1EM 102 The average COP for the CO2 heat pump system is 10.4% higher at the summer conditions than for the R-22 system and for the winter conditions the CO2 heat pump system it is 21.1 % higher than for the R-22 system. It can therefore be claimed that the CO2 heat pump system is a more effective system than the R-22 heat pump system. This corresponds with the statement made about the water temperature profiles in figures 4.8 and 4.9 that the CO2 heat pump system seems to be coping better with the demand for hot water than the R-22 system. An interesting occurrence that can be observed from table 4.2 is that the average COP of the CO2 system is higher at the winter condition than it is for the summer condition. This can be due to the fact that the inlet water temperature is lower in the winter condition than for the summer condition and because the CO2 system could be less affected by the ambient conditions than the R-22 system. It is known that the inlet water temperature plays a big role when it comes to the performance of the CO2 heat pump system. The daily power consumption of the two heat pump systems during summer are shown in figure 4.10 and figure 4.11 respectively, with the daily power consumption of the ILH system shown in figure 4.12. The green line shows the power consumption of the heat pump and will be at a maximum of 18kW. The purple line shows the power consumption of the in-line heater and will either be at 24kW when operating in one step and will be at 48kW when fully operating. For the in line heater the purple line will be at 72kW when operating and will be equal to the total power consumption. The red line is the total power consumption of the heat pumps together with the in-line heater when in operation. The R-22 heat pump is in operation longer at a time than the CO2 system. The short running time of the ILH system shows that it is able to keep up with the hot water demand sufficiently for the summer condition. The difference between a heat pump system and an ILH system can be clearly seen from the power consumptions. Here it can be seen that the heat pump uses about 55% less power to heat the same amount of water as the ILH does. A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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