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5 – Experimental Results 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.0 MPa SH: 35/30oC B COP 2.96 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.5 MPa - Optimum pressure SH: 35/30oC B COP 3.03 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa SH: 35/30oC B COP 2.89 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.5 MPa SH: 35/30oC B COP 2.83 Figure 5.34 The heat transfer process for the tripartite gas cooler in the SH mode illustrated in T-Q diagrams at 35/30°C supply/- return temperatures and varying high-side pressure. The COP vs. the Temperature Level in the Space Heating System Figure 5.35 shows the measured COP for the CO2 heat pump unit as a function of the high-side pressure at varying supply/return temperatures for the space heating system. The evaporation temperature was -5oC (3.046 MPa), the suction gas superheating was 4.8 K ±0.2K and the CO2 mass flow rate was 1.44 kg/min ±1%. The optimum high-side pressure rose by approximately 1 to 1.5 MPa when the supply/return temperatures for the space heating system was altered from 33/28oC to 40/35oC. The COP dropped off on average 1.7% per K temperature rise when the supply temperature was increased from 33 to 40oC. Whereas the COP curves were relatively flat around the optimum high-side pressure at the two lowest temperature levels, there was a distinct maximum at 40/35oC. 140 Temperature [°C] Temperature [°C] Temperature [°C] Temperature [°C]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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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