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5 – Experimental Results ♦ Estimate the compressor performance as well as the heating or cooling capacities of the different heat exchangers, and compare the results with the design values. The CO2 mass flow rate dropped gradually during the test period due to wear and tear in the bearing for the connecting rod between the crankshaft and the piston. The Dorin reciprocating compressor was therefore replaced by a hermetic two-stage rolling piston compressor from Sanyo (prototype). Due to the very compact design, it was possible to mount the new compressor on the same frame as the rest of the CO2 heat pump unit. The rolling piston compressor was designed to use a PAG lubricant which was insoluble with CO2. Since the oil return pipeline was connected to the bottom of the low pressure receiver (LPR), the density of the PAG had to be higher than that of the CO2 liquid in order to ensure proper oil return (ref. Appendix A2.2, Methods of Controlling the High-Side Pressure). Since there was no available density data for the lubricant, the density was measured and compared with the density of saturated liquid CO2 (RnLib, 2003). The results are presented in Figure 5.1. 1100 1000 900 800 700 -15 -10 -5 0 5 10 15 20 Temperature [°C] PAG CO2 Figure 5.1 The measured density of the PAG lubricant and the calcu- lated density of saturated CO2 liquid (RnLib, 2003). Figure 5.1 demonstrates that the LPR oil return system would work satis- factorily at evaporation temperatures down to roughly -15°C. 112 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
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