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Heat Pumps Technology Guide SEAI Figure 3: Heat pump refrigerant cycle 2 Compressor Heat source Heat distribution 4 Expansion Valve The closer the evaporator and condenser temperatures, the closer the gas pressure at these points, and the less work the compressor has to do to increase the gas pressure between them. The less work the compressor does, the less electricity it will consume. Therefore, the efficiency of the heat pump is closely linked to the difference in temperature between the heat source and the heat sink (heat distribution system). 2.2.2. Transcritical heat pumps Transcritical heat pumps use carbon dioxide (CO2, also known as R744). Transcritical heat pumps have the same basic configuration as any vapour compression heat pump. However, due to the different properties of CO2, a much larger temperature difference across the heat distribution system is necessary. Thus, transcritical heat pumps require a low return temperature (usually below 30 °C) but can supply high flow temperatures (over 80 °C). They are suitable for heating hot water storage tanks. A system using a transcritical heat pump is designed to ensure that the return temperature is always within the acceptable range. 4 m o C p r e s s Condenser Evaporator 3 1 C e o t n a d r o p e n a s v e E d n a E x pPDF Image | Heat Pumps Technology 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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