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0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 16.7 C Outdoor -8.3 C Outdoor R744, -8.3 C Outdoor R744, 1.7 C Outdoor R744, 8.3 C Outdoor R744, 16.3 C Outdoor R410A, -8.3 C Outdoor R410A, 1.7 C Outdoor R410A, 8.3 C Outdoor R410A, 16.3 C Outdoor 2.0 2.5 3.0 3.5 4.0 Compression Ratio Figure 2.8 Compressor efficiency at matched cooling capacity 2.4 Effect of varying indoor airflow rate on R744 performance In the experiments comparing the heat pump performance of R744 to the R410A baseline system, the airflow rate over the R744 indoor coil (gas cooler) was set to match that of the R410A system. Since R744 potentially has the advantage to deliver air at a higher temperature and reduced airflow rate, experiments were run at varying indoor flow rates to observe the gas cooler performance trade-offs. The results are shown in Figure 2.9. 12 11 10 9 8 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 7800 8000 8200 8400 8600 7800 8000 8200 8400 8600 Discharge Pressure (kPa) Discharge Pressure (kPa) Figure 2.9 Effect of airflow rate reduction on R744 indoor coil (R410A baseline face velocity=1.55 m/s) 2.5 Effect of suction accumulator and indoor coil configurations on R744 results Further experiments suggested that the R744 system might not have had full benefit of the suction accumulator. 10 Face velocity=1.55 m/s Face velocity=1.37 m/s Face velocity=1.01 m/s Face velocity=0.78 m/s Capacity (kW) Isentropic Efficiency Heating COPPDF Image | Comparison of R744 and R410A
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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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