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CHAPTER 5: ECONOMICAL COMPARISON BET\VEEN ILH, R-22 AND CO2 SYSTEM 118 5.1 Operational Cost The tariff and rates used was taken from the latest figures available from Eskom. Eskom is South Africa's distributor and supplier of power from rural to industrial applications. The tariff structure used is Megaflex which is generally used in the commercial and industrial sectors. This is listed in more detail in Appendix C. Electricity charges are based on a c/kWh method. There are certain rates depending on what time of year and what time of day the energy is being used. Table 5.1 gives a summary for the rates used to calculate the operational cost of the three systems. Table 5.1: Megaflex electricity tariffs. Summer Winter 12.91 9.00 14.96 9.00 Peak [c/kWhJ 29.99 107.25 Standard [c/kWhJ 18.41 27.94 Off-Peak [clkWhJ Network demand [RlkVAimonth] The winter months are taken as June to August and the summer months September to May. The peak demands are based on when energy consumption is at its greatest in South Africa and therefore the tariffs charged for energy consumption during these periods of the day are more expensive. Fig ure 5.1 shows the time table for the peak, off peak and standard tariff rates. Figure 5.1: Peak, off-peak and standard time periods, Eskom (2009/10). A Techno-Economical Analysis ofa COl Heat Pump. School ofMechanical Engineering, North-West University Peak Off-peak StandardPDF Image | CO2 HEAT PUMP Analysis
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