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ments of temperatures and mass flow rates in the secondary (water) circuits. The heat pump performance was also calculated by measuring the mass flow rate as well as the inlet and outlet temperatures and pressures of the supercritical CO2 in the tripartite gas cooler. The percentage diffe- rences between the measurements for the secondary (water) circuits and the CO2 circuit was calculated as: ⎛&&⎞ & ⎜QW −QCO2 ⎟ ∆Qrel =⎜ Q& ⎟⋅100% (5.4) ⎝W⎠ 5 – Experimental Results where Q& W and Q& CO2 represent the measured heating capacity in the water circuits and the CO2 circuit, respectively. The results from the calculations are presented in Figure 5.53. 10 8 6 4 2 0 SH-mode DHW-mode Comb-mode Average 4.5 5.0 5.5 6.0 6.5 Heating Capacity [kW] 7.0 7.5 Figure 5.53 The percentage differences between the total heating capa- city of the tripartite gas cooler based on measurements from the secondary (water) circuits and the CO2 circuit. With reference to Section 4.1.4.6, Uncertainty of the Computed Values, the average percentage difference in the calculated heating capacity was considerably larger than estimated in the uncertainty analysis. This deviation may be explained by the fact that the enthalpy calculations were based on thermodynamic data for pure CO2, and not for a mixture of CO2 and lubricant. The relatively large oil concentration may also have affected the accuracy of the Coriolis-type CO2 mass flow meter. 159 Difference [%]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
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