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CHAPTER 4: COJvfPARISON BETWEEN R-22 AND CO2 SYSTEM 104 Figure 4.12: Daily power consumption for the ILH heat pump system (summer). ,-"" +- k 80,000 . , - - - - - - - - - - - - - - - - - - , - - - , - - - - - , - - - - , 1 " ' - - ~1 - - - r " 6 0 , 0 0 0 .,-""·····_··_·-·---1-I!········_······_·-; r - - _ ......... - - ..- ~·--·f···-I_---ii_l-f··-·CI-.····+·.... - . + - ......... 70,000 50,000 ~ ~ 40,000 1 - - - - _ _ c-..•..•._..+..,-.._ _ _ ._.._... , ll. It~-1----rt-. 10,000 +-----Il-I----I-"~+-ii--'--I-11--I--I---I-'.---i-l--'--i--+--I---I-H-, 20,000 I I CO2 I R-22 IILH Total run time ILH 120 min 110 min 520 min Total run time HP 660 min 700 min omin Total Power Consumption 1647563 W 1715385 W 3740000W. O~---- I ._--~--._--~--__--~--__~__--__~~~ Time [h] Table 4.3: Total run time for the three systems (summer). ,I .. a 2 4 6 8 10 12 14 16 18 20 22 24 Table 4.3 gives the summer total running time of all three systems and the operating times of the backup in-line heater for the two heat pump systems. The run time for the R 22 heat pump is 40 minutes longer than for the CO2 heat pump and the operating time for the in line heater in the R-22 system is 10 minutes longer than for the CO2 system. Therefore it can be seen that the CO2 system will be more efficient than the R-22 system because of its higher COP. The total running time of the ILH system is much less than for both the heat pump systems, showing that the ILH system is keeping up well with the hot water demand. The total power consumption for the summer day period is shown in table 4.3. It shows that the R-22 system uses about 4% more power than the CO2 system. The reason for A Techno-Economical Analysis of a CO2 Heat Pump. School of Mechanical Engioeering, North-West University r""" ,...,,1 ~-PDF Image | CO2 HEAT PUMP Analysis
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