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6 – Modelling Space Heating Only (SH Mode) Figure 6.15 shows the simulated temperature profiles of the supercritical CO2 and the water flows in the tripartite gas cooler at optimum high-side pressure in the SH 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). 100 80 60 40 20 0 CO2 Iso Space Heating bar 30.3 30.0 88.7 35.0 Qtot: 5.4 kW COP: 3.01 PGC: 8.5 MPa 0.0 0.2 0.4 0.6 0.8 1.0 Relative Gas Cooler Length [-] Figure 6.15 The simulated temperature profiles for the tripartite CO2 gas cooler at optimum high-side pressure and 35/30oC supply/return temperature in the SH mode. The characteristic temperature profile of the CO2 flow was mainly a result of the roughly 10 times higher mass flow rate for the water flow as well as the considerable variations in the specific heat capacity of the CO2 during heat rejection. 6.1.4.3 The Effect of the Inlet Water Temperature The inlet (city) water temperature to the DHW preheating gas cooler unit during testing in the combined mode and the DHW mode ranged from about 5 to 7.4°C (ref. Section 5.1). Since the design of the test rig did not enable testing at higher inlet water temperatures, a number of simulations were carried out in order to document the effect of varying inlet water temperature on the COP. 189 Temperature [°C]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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