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CHAPTER 4: COMP ARISONBETVlEENR-22AND CO2 SYSTEM 107 Figure 4.15: Daily power consumption for the ILH heat pump system (winter). 80,000 70,000 60,000 50,000 ~ ~ 40,000 0 0.. 30,000 20,000 10,000 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Time [h] When the heat pumps are in operation it could be seen that they are in operation for the remaining time that the ambient conditions allow. This shows that the low surrounding ambient temperatures and the bigger demand for hot water ensures that the heat pump is required to operate at all times. From about 21:00 in the evening both the heat pump and in-line heater is operational, this however is during the off-peak hours and does not contribute excessively to the electricity bill. Table 4.4: Total runtime for the in-line heater and heat pump for all three systems (winter). CO2 R-22 ILH Total run time ILH 730 min 770 min 980 min Total run time HP 900 min 900 min omin Total Power Consumption 4384864 W 4668307W 7056000 W Table 4.4 gives the total running time of all three systems and the operating time of the in-line heater for the two heat pump systems in winter. The operating time for the in-line heater within the R-22 system is 40 minutes longer than for the CO2 system. This is not too much but still shows that the CO2 system is Goping better with the demand for hot water and with the lower ambient conditions than the R-22 system. This is because of the lower inlet water temperature to the CO2 heat pump which results in a better COP for A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanica1 Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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