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2 – Technological Status transfer properties of CO2 and the high compressor efficiency (ref. Appendix A, CO2 as a Working Fluid in Heat Pumps). Another advantage of the CO2 heat pump water heater is the capability of supplying high- temperature DHW, which eliminates the requirement for supplementary heating. In recent years, a number of prototype CO2 heat pump water heaters have been tested. Virtually all installations have been single-stage units using a low-pressure liquid receiver (LPR), a suction gas heat exchanger and a counter-flow tube-in-tube gas cooler. The principle of the CO2 heat pump water heater is presented in Figure 2.7. LPR EVAPO- RATOR EXPANSION VALVE COMPRESSOR 60 to 850C SINGLE-SHELL HOT WATER TANK PUMP Hot water consumption (50 to 550C) City water (5 to 250C) 20 HEAT EXCHANGER GAS COOLER Figure 2.7 Principle of a CO2 heat pump water heater. Nekså et al. (1998) tested a 50 kW CO2 heat pump water heater. The COP for the unit ranged from about 3.0 to 4.3 when the set-point for the DHW was 60°C and the evaporation temperatures ranged from -20 to 0oC. At 80oC DHW temperature and 0°C evaporation temperature, the measured COP was about 3.6. The optimum gas cooler (high-side) pressure ranged from about 9 to 11 MPa bar at DHW temperatures between 60 and 80°C. CO2 heat pump water heaters in the capacity range from 5 to 20 kW have been investigated by, among others, Rieberer and Halozan (1997), Hwang and Radermacher (1998) and Saikawa and Hashimoto (2000). The mea- sured COPs of the prototype units are in the same range as for the CO2 heat pump unit which was tested by Nekså et al.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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