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CHAPTER 4: COMPARISON BETWEEN R-22 AND CO2 SYSTEM 91 Storage Vessel 1 Figure 4.1: Layout of the system. I ' Storage Vessel 2 .I !• An in-line heater with a heating capacity of 48kW with a discharge temperature of 60°C is installed as a backup for when the heat pump system is not able to operate due to low ambient conditions or when the demand for hot water is more than what can be generated by the heat pump. The ILH is a two stage heater using only its full capacity when necessary. The minimum dry bulb temperature at which the heat pump system can operate is set at 5°C; therefore the heat pump system will not operate below a dry bulb ambient temperature of 5°C and the in-line heater will come in operation should this occur. The storage vessel supplying the heat pump with water is set to turn off the heat pump when the supply temperature of the water reaches 30°C. Therefore the inlet water temperature to the heat pump system will not exceed 30°C. 4,1.2 Component Sizing The three systems described are an R-22 heat pump, a transcritical CO2 heat pump (both of 50kW nominal heating capacity as described in the previous chapter), and the ILH which is a 72kW step up electrical heating system. The two heat pump systems consist of an ILH (48kW) as well to give some support and therefore, when used on its own, a bigger capacity ILH (72kW) is needed to provide its own backup and to ensure that the ILH system on its own will be enough to keep up with the demand. A Techno-Economical Analysis ofa CO2 Heat Pump. School ofMechanical Engineering, North-West University Heat pumpPDF Image | CO2 HEAT PUMP Analysis
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