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5 – Experimental Results 1000 800 600 400 200 0 DHW preheating Space heating 11 10 9 8 7.5 DHW reheating 0 20 40 60 80 100 120 Temperature [°C] Figure 5.52 The density of supercritical CO2 at high-side pressures ranging from 7.5 to 11 MPa (RnLIb, 2003). During operation in the combined mode (Figure 5.49), the DHW pre- heating gas cooler had the lowest average pressure drop gradient. Accor- ding to Eq. 5.3 and Figure 5.52, this was mainly a result of the large average density of the supercritical CO2 and the consequent low fluid velocity. Owing to the considerably lower average CO2 density in the DHW reheating gas cooler unit, the average pressure drop gradient was roughly 5 times higher than that of the DHW preheating gas cooler unit. For the same reason, the measured mean pressure drop gradient for the space heating gas cooler was higher than that of the DHW preheating gas cooler unit and lower than that of the DHW reheating gas cooler unit. According to Figures 5.50 and 5.51, the differences in the measured average pressure drop gradients during operation in the DHW mode and the SH mode can also be explained by the large variations in the average fluid density. The temperature ranges for the DHW reheating and DHW preheating gas cooler units during operation in the DHW mode were about 7 to 65oC and 50 to 110oC, respectively, while the inlet and outlet CO2 temperatures for the gas cooler unit ranged from about 28 to 100oC during operation in the SH mode. 5.1.3.9 Comparison of the Measurements from the Water Circuits and the CO2 Circuit With reference to Sections 5.1.3.2 through 5.1.3.4, the heating capacity and the COP of the prototype CO2 heat pump unit were based on measure- 158 Density [kg/m3]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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