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2.2 Components of a heat pump The principal components of an air-to-air heat pump and how they operate are described in Table 2.1 and shown in Figures 2.7, 2.8 and 2.9. Table 2.1 Heat pump components Component Description Evaporator A heat exchanger that absorbs heat from the surroundings. • For heating, it is the outdoor unit. • For cooling, it is the indoor unit. Condenser A heat exchanger that releases heat to the surroundings. • For heating, it is the indoor unit. • For cooling, it is the outdoor unit. Compressor Reduces the refrigerant gas volume by compressing it, causing the gas temperature and pressure to rise, and pumps the refrigerant around the pipework/system. The compressor may operate as a fixed- or variable- speed system (see 2.4 Fixed speed and inverter compressors). Metering device Allows the refrigerant condensate (liquid) to expand, lowering the pressure and temperature. Coil/pipework Continuous, closed-circuit tubing through which refrigerant flows and heat transfer occurs. The pipes generally have fins to increase the surface area for the heat exchange process (see 6.0 Installing pipework). Refrigerant The compound that circulates through the heat pump system in both liquid and gas state, alternately absorbing and releasing heat (see 8.0 Refrigerants). Reversing valve Changes the direction of flow of the refrigerant to reverse the heat pump function from heating to cooling or vice versa. The reversing valve also allows the pump to switch into defrost mode (see 3.4 Impacts of defrost cycle on efficiency). Fan Draws air across the evaporator coil (for heat extraction) and moves air away from the condenser coil (for heat distribution/removal). Figure 2.7 Schematic diagram of reverse-cycle, air-to-air, split system heat pump operation (heating mode) outdoor reversing valve compressor indoor heat in evaporator cool air out heat out condenser cool air in gas flow liquid flow metering device 10PDF Image | Heat pump installation Good Practice Guide
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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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