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CHAPTER 5: ECONOMICAL COMPARISON BETWEEN ILH, R-22 AND CO2 SYSTEM 121 Table 5.2 shows the summary of the monthly energy cost for all three systems. The annual operating cost for the R-22 system is R4, 903.40 more than that of the CO2 heat pump system. The ILH system has an operating cost of R69, 917.90 more than the CO2 heat pump system. Figure 5.4 shows the percentage difference between the operating costs of the three systems. 70.00 60.00 50.00 40.00 ~ 30.00 & c:: I!! ~ 20.00 i:i ~ -10.00 10.00 0.00 Figure 5.4: Cost difference between the three systems (%). The R-22 system is 11.92% more expensive over a period of one year and the ILH system 65.87% more expensive than the CO2 system. The ILH cannot compete with a heat pump system when it comes to its operating cost seeing that it is more than 50% more expensive than a heat pump system. The 11.92% difference in operating cost between the two heat pump systems are quite substantial and it shows that on operation the CO2 heat pump system will be a lot more cost effective than the R-22 system. The operating cost pertaining to the three systems are very important since South Africa is in a power crisis where businesses are forced to save power and at the time of publishing the results of this study, the price of electricity is scheduled to go up drastically again in the near future. As the cost of electricity increases the difference in A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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