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6 – Modelling 6.1.4 Simulation Results 6.1.4.1 The Specific Heat Capacity Ratio Figure 6.7 shows, as an example, the simulated variations in the cp-ratio1 during heat rejection in the tripartite gas cooler in the combined mode. The high-side pressure was 8.5 MPa, and the hot water temperature and the supply/return temperatures in the space heating system were 60oC and 35/30oC, respectively. The gas cooler geometry and the operating conditions were the same as for the prototype CO2 heat pump unit. 3.0 2.5 2.0 1.5 1.0 0.5 0.0 DHW Reh eating DHW Preheating Space Heating 0.0 0.2 0.4 0.6 0.8 1.0 Relative Gas Cooler Length [-] Figure 6.7 The simulated specific heat capacity ratio for the CO2 heat pump unit at 8.5 MPa high-side pressure in the combined mode at 35/30oC (SH) and 60oC (DHW). Due to the considerable temperature dependency of the specific heat capa- city of the supercritical CO2, the cp-ratio ranged from about 0.2 in the space heating gas cooler to 2.8 in the DHW reheating gas cooler. 6.1.4.2 Gas Cooler Temperature Profiles Simultaneous Space Heating and Hot Water Heating (Combined Mode) Figures 6.8 through 6.13 present the simulated temperature profiles of the supercritical CO2 and the water flows in the tripartite gas cooler at optimum high-side pressure in the combined mode. The gas cooler geometry and the operating conditions were the same as for the prototype CO2 heat pump unit (ref. Sections 4.1 and 5.1). 1 The ratio between the specific heat capacity of water and supercritical CO2. 183 Cp Ratio [-]PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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