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Figure 2. Size and layout of the heat pump outdoor unit The schematic layout of the components of the heat pump outdoor unit is indicated in Figure 3. As shown in figure 3, the unit consists of mainly four parts: a gas cooler, an evaporator, an electric expansion valve and a compressor. Furthermore, at the compressor outlet, there is a bypass line, which is controlled by a solenoid valve, connected to the evaporator. The bypass is used when the heat pump is running in defrosting mode. It is also worth mentioning that there is a small heat exchanger placed at the bottom of the evaporator, see Figure 4. Supercritical CO2 at the gas cooler outlet will pass through this heat exchanger before it enters the expansion valve, to keep the bottom of the evaporator free from ice. With such an arrangement, there is no electric heater (no heating wire) needed for preventing the ice from building up at the bottom of the evaporator (Figure 4). 12PDF 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
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