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Figure 29 shows the variation of Lorenz efficiency with gas cooler side pressure, the trend shows linear increase in achieved values with the increment in pressure. Compared with previous cases in this case CO2 was leaving the gas cooler at lower temperatures, possibility to further cool CO2 compared with previous two cases (more energy was recovered) could be the one of the reasons for having higher values for Lorenz efficiency in this specific case. Case C Part 2 In this case the set point temperature was fixed to 60 oC and evaporation temperature was varied (-5, 0 and +5 oC) to see the influence of the evaporation temperature on the system performance. COP & Heating capacity 4.5 35 4 3.5 2.5 2 1.5 1 0.5 Water 16-60 oC 30 3 25 COP at 5C evaporation COP at 0C evaporation COP at-5C evaporation 00 7000 8000 9000 Gas cooler side pressure (kPa) 20 15 10 Q at 5C evaporation 5 Q at 0C evaporation Q at -5C evaporation Figure 30 COP and heating capacity with gas cooler pressure Varation of the COP with the varation of gas cooler side pressure alongwith the evaporation pressure is shown in figure 30. In each case the compressor speed was varied from 1050 to 1800 RPM to vary the gas cooler side pressure. At low evaporation temperature (hence low evaporation pressure as well) the gas cooler side pressure was also low so less amount of water could be heated to the set point temperature i-e heating capacity (hence COP) was low. As the evaporation temperature was increased due to the same operating speed range the gas cooler side pressure (and temperature) was also increased which helped in improving the heating capacity (by increasing the water flow rate) and COP. 30 COP Heating Capacity (kW)PDF Image | heat recovery from R744 based refrigeration system
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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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