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CHAPTER 5: ECONOMICAL COMPARISON BETWEEN ILH, R-22 AND CO2 SYSTEM 119 Figure 5.2 shows the monthly energy consumption of all three systems and it is used to explain the difference in operating cost between the three systems. The ILH system uses on average 57.5% more energy per month to deliver the same heating capacity as the CO2 heat pump system and will definitely be the more expensive system when it comes to its operating cost. The R-22 system uses 9.5% more energy per month on average as the CO2 system. The other reason for the R-22 heat pump system having higher energy consumption is because of its lower COP resulting in more power required for the same thermal heating. It is clear that all three the systems use more energy in the winter time when it is colder than in the summer time mainly due to the higher water consumption. Figure 5.2: Monthly energy use. ~.O,-------~·------------ ---------.~~------------~------_. 35CXXJ.0 + ---------------------------- 3CXXXJ.0 + -----------------------'i!il_ ---li!- ~.o+_--------------~~~~i!il_--_Ii!_--- i2CXXXl.O+ ------ E150:0.0 +---i'1iil---{....---1!ll\r--~1__ ~ 10000,0 +-~~:--- 50:0.0 0.0 Month The total monthly energy cost for all three systems are shown in figure 5.3. The operating cost of the ILH system is 65% more for the whole year than for the CO2 heat pump system. The operating cost of the R-22 heat pump system is also 12% more than that of the CO2 heat pump system as a result of the energy consumption shown in figure 5.2. A Techno-Economical Analysis ofa CO2 Heat Pump. School ofMecharucal Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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