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CHAPTER 5: ECONOMICAL C011PARISON BETWEEN ILH, R-22 AND CO2 SYSTEM 123 5.2 System Cost The capital cost of the three systems plays a significant role when a consumer has to choose a system. For the capital cost calculation the following were taken into account: • Component costs. • Manufacturing labour. • Mark-up. This was done so that the costing is realistic in terms of what the consumer would have to pay when he orders anyone of the systems. The R-22 heat pump cost was obtained from a local manufacturer, so has the in-line heater cost. The CO2 system cost was projected according to the same principle applied to the costing of the R-22 system. The price for the compressor was received from the manufacturers of DORIN compressors, while the cost for the control equipment was received from Danfoss (2002). The cost of the gas cooler was determined by KAORI which specified a brazed plate heat exchanger to give the acq uired heating capacity. The costs of the three systems are given in table 5.3. Table 5.3: Capital cost of all three systems. There is a big difference between the cost of the two heat pump systems and the ILH system. This is because a heat pump is a more expensive and detail-manufactured machine compared to the in-line heater. The cost difference between the R-22 and CO2 system is 11.7% which is a relatively small difference, therefore not crucial. The main reasons for the cost difference between the two heat pump systems are because the CO2 system is a new concept and its components are not mass-produced at this stage (compared to R-22 components). A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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