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CHAPTER 4: CO:tvJPARISON BEnvEEN R-22 AND CO2 SYSTEM 112 The daily energy consumption over a period of one year is shown for all three the systems in figure 4.20, figure 4.21 and figure 4.22. There is a linear increase in the power consumption as the year draws closer to the winter months. There is a direct influence of the water consumption on the power consumption which can be seen from the water consumption and energy consumption profiles. The deviation in the energy consumption profile for the heat pump systems during the winter months is because the in-line heater will be in operation more often, due to lower ambient conditions affecting the heat pump COP. It can be seen that the power consumption is much higher for the ILH system than it is for the heat pump systems, reaching a maximum of 1200kWh per day compared to the less than 800kWh per day for the heat pump systems. The power consumption for the R-22 heat pump system is higher, reaching a maximum of almost 800kWh as opposed to the energy usage of the CO2 system which is just above 700kWh in the winter months due to the difference in COP. The power consumption during the summer months is more or less the same for both the heat pump systems since the in-line heater is not in operation as much as during the winter months. Figure 4.20: Summary of yearly energy consumption for the CO2 the system. 800~--,---------------------------------------~---,---, 600 :<: 500 3: =. >. l::' 400 OJ J:: OJ >. £3 300 200 100 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 A Techno-Economical Analysis ofa CO2 Heat Pump. School of Mechanical Engineering, North-West University DayPDF Image | CO2 HEAT PUMP Analysis
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