English: Diagram of a phase change heat pump.
Note that the arrows in the diagram are meant to indicate the flow of air and coolant; they do not correspond to heat flow, which in the system depicted is (generally) from right to left.
Deutsch: Schema einer Wärmepumpe mit Phasenwechsel.
Condenser coil (hot side heat exchanger, gas cools and liquifies)
Metering Device (liquid expands and cools)
Evaporator coil (cold side heat exchanger, liquid vaporizes and heats up)
Compressor (gas is compressed and heats up)
Red = Gas at high pressure and very high temperature
Pink = Liquid at high pressure and high temperature
Blue = Liquid at low pressure and very low temperature
Light Blue = Gas at low pressure and low temperature
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Diagram of a phase change heat pump. Drawn in Inkscape by Ilmari Karonen. New version with the arrow in the evaporator coil reversed to show correctly the heat transfer (from outside environment to the inside fluid).