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7.1.4.2 Design Considerations Section 3.2.4, Application of a Tripartite Gas Cooler, provides a general description of the operational characteristics and design parameters for a counter-flow tripartite CO2 gas cooler. Based on the experimental results, the following general considerations regarding the design of the tripartite gas cooler can be presented: ♦ The SH gas cooler unit should be designed for a relatively small temperature approach (e.g. ∆TA<0.2 K) during operation in the com- bined mode, since the required heat transfer area in the combined mode will be larger than that of the SH mode. ♦ The DHW gas cooler units should be designed for a relatively low temperature approach (e.g. ∆TA<2 K) during operation in the DHW mode, since the required heat transfer area in the DHW mode will be larger than that of the combined mode. ♦ In the combined mode, the heat transfer surface of the DHW reheating gas cooler unit and the inlet CO2 temperature (i.e. the high-side pressure) govern the water flow rate in the DHW circuit. The larger the surface, the larger the DHW water flow rate. ♦ Due to the relatively large mean temperature difference between the CO2 and the water in the DHW reheating gas cooler unit, even small changes in the heat transfer surface will have a major impact on the heating capacity and the water flow rate in the DHW circuit. ♦ The higher the DHW temperature, the larger the optimum heat transfer surface for the DHW reheating gas cooler unit. ♦ In the combined mode, the heat transfer surface of the DHW pre- heating gas cooler unit governs the cool-down of the CO2 after the SH gas cooler unit. ♦ The lower the temperature level in the space heating system, the smaller the DHW heating capacity ratio during operation in the combined mode. ♦ The lower the temperature level in the DHW system, the larger the DHW heating capacity ratio during operating in the combined mode. In other words, the larger the water flow rate in the DHW circuit, the smaller the approach temperature at the cold end of the DHW pre- heating and reheating gas cooler units, and the larger the DHW heating capacity ratio. 7 – Discussion and Analysis 217PDF Image | Residential CO2 Heat Pump System for Combined
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