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Table 1 Accuracy of the measurement instruments Variable Temperature Volume flow Measurement instrument Accuracy Pt 1000 DIN class A HGQ1-R3-182/1 EN1434 class 2 ± 0.15 + 0.002 × t [°C] Compressor power WM22-DIN Current (I): from 0.003Ib to 0.2 Ib: ± (0.5%RDG + 3DGT ) from 0.2Ib to Imax: ± (0.5%RDG +1DGT ) Voltage (U): in the range Un: ± (0.5%RDG +1DGT ) Frequency (Hz): ± 0.1%RDG (50 to 60 Hz) Due to agreed upon safety and confidentially reasons, it was not allowed to open the refrigerant loop during the testing. Therefore, during the study, the CO2 temperatures are measured on the tube surfaces, and no pressure readings were taken in the cycle. The study of the heat pump had to a large part to be done indirectly via measurements on the secondary sides i.e. the water and air sides. Figure 10 shows a schematic layout the test rig’s data acquisition points. As shown in the figure, for the outdoor unit, CO2 temperatures are monitored on the evaporator, after the compressor and before the expansion valve respectively. Meanwhile, the air temperatures before and after the evaporator as well as water temperatures at gas cooler inlet and outlet are also recorded. For the tank side, the temperatures at tap water inlet and outlet as well as temperatures before and after radiator are recorded. Furthermore, the compressor power consumption, water flow rate to the heat pump and radiator are also monitored. P-16 P-15 E-6 V-3 P-12 E-9 E-4 P-4 P-5 V-2 I-3 E-3 P-3 P-6 P-2 P-7 E-5 P- P- 10 Temperature sensor Energy meter Flow meter Power meter 11 Figure 10. Schematic layout of test rig with measurement points P-23 E-2 I-2 18 I-1PDF Image | CO2 heat pumps for the Swedish market
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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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