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5 – Experimental Results 20 16 12 8 4 0 Space Heating 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 Gas Cooler pressure [MPa] Figure 5.51 The measured mean pressure drop gradient for the single gas cooler unit in the SH mode. With reference to Eq. 6.28 in Section 6.1.3.4, Pressure Drop Correla- tions, the local pressure loss gradient for (single-phase) supercritical CO2 is proportional to the density and the square of the average fluid velocity at the cross-section of the tube. By substituting the fluid velocity v with the ratio between the mass flux and the density (G/ρ), the mean pressure drop gradient for a gas cooler unit can be expressed as: ∆p ⎛G2⎞⎛1⎞ L =ζ⋅⎜2⋅d ⎟⋅⎜ρ⎟ (5.3) where ∆P is the total pressure drop, L is the tube length, dh is the inner diameter of the tube, ζ is the friction factor, G is the mass flux and ρ is the weighted average density of the supercritical CO2. Hence, Eq. 5.3 demon- strates that the mean pressure drop gradient will be inversely proportional to the density of the supercritical CO2 (Incropera and DeWitt, 2001). Figure 5.52 shows the density of supercritical CO2 at varying high-side pressures and temperatures, and the dashed lines indicate the temperature ranges for the gas cooler units in the combined mode. ⎝h⎠⎝⎠ 157 dP/L [kPa/m]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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