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5 – Experimental Results At the actual pressure levels, which corresponded to a pressure ratio in the range from 2.5 to 3.4, the power input to the compressor was more or less proportional to the discharge pressure. The minor variations were a result of the uncertainty in the pressure and power measurements as well as the variations in the isentropic efficiency, the heat loss from the com- pressor shell, the mass flow rate and the superheating of the suction gas. Overall Isentropic Efficiency and Relative Heat Loss Figure 5.43 shows the estimated overall isentropic efficiency for the prototype compressor as a function of the pressure ratio. The operating conditions were the same as in Figure 5.41, and the figures were calculated on the basis of the suction gas pressure and temperature, the discharge pressure, the power input to the compressor and the net CO2 mass flow rate. The estimated oil discharge rate for the compressor, which ranged from about 6 to 9% of the total mass flow rate at varying pressure atios (ref. Table 4.2, Section 4.1.2.2, The Compressor), was measured in another project. 0.60 0.55 0.50 0.45 2.5 2.7 2.9 3.1 3.3 3.5 Pressure Ratio, π [-] η = -0.0488·π2 + 0.2862 ·π + 0.1179 Figure 5.43 The estimated overall isentropic efficiency for the prototype compressor as a function of the pressure ratio at constant inlet conditions (approximately 3.046 MPa, -2.5oC). The measured overall isentropic efficiency, which did not change much with the pressure ratio within the narrow operating range, should only be regarded as a rough estimate due to the considerable uncertainty in the oil discharge rate as well as the unknown effect of the oil on the power consumption of the compressor. The upper solid-drawn line in Figure 5.43 represents the estimated isentropic efficiency at zero oil discharge rate. 149 Isentropic Efficiency, η [-]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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