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D4.1 Water Circuit Measurements The uncertainty in the watt meter that measured the power consumption was ±25 W, whereas the uncertainty in the heating capacity is shown in Table D2. Table D4 shows the calculated relative uncertainty in the COP, when the compressor was running at 6000 rpm (100 Hz), the set-point for the hot water temperature was 70°C, and the supply and return tempe- ratures in the space heating system were 35/30°C. Table D4 The relative uncertainty in the COP for the CO2 heat pump unit. The heating capacities were based on measurements from the water circuits. SH DHW αCOP [%] ±2.8 ±1.7 SH=Space heating mode DHW=hot water heating mode D4.2 CO2 Circuit Measurements SH + DHW ±1.9 SH+DHW=combined Appendix D – Uncertainty Analysis The uncertainty in the wattmeter that measured the power consumption was ±25 W, whereas the uncertainty in the heating capacity is shown in Table D3. Table D5 presents the relative uncertainty in the COP, when the compressor was running at 6000 rpm (100 Hz), the set-point for the hot water temperature was 70°C, and the supply and return temperatures in the space heating system were 35/30°C. Table D5 The relative uncertainty in the COP for the CO2 heat pump unit. The heating capacities were based on measurements from the CO2 circuit. Heating Mode GC Pressure αCOP [%] SH=Space heating mode SH DHW 9 MPa 10 MPa ±2.1 ±2.6 SH + DHW 8 MPa 9 MPa ±2.6 ±2.5 8 MPa ±2.6 9 MPa ±2.2 DHW=hot water heating mode SH+DHW=combined mode D5PDF 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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