Air source heat pump
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An air source heat pump, the most common type of heat pump, can absorb energy sourced from cold ambient air outside a building, and release the energy at a higher temperature to heat the building, eit
Heat pump on balcony of apartment
Air source heat pump
An internal view of the outdoor unit of an air source heat pump
The outdoor unit of an air source heat pump operating in freezing conditions
Vapour-compression refrigeration or vapor-compression refrigeration system, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method
Air source heat pump
…the used electric energy providing typically 3 or 4 times more pumped thermal energy than simple resistive Joule heating. Heat pumps use the same vapor-compression refrigeration process and much the same equipment as an air conditioner, but in the opposite direction, or rather source and target can be exchanged, vice versa…
Lysholm screw compressor
Figure 5: Commercial water-cooled liquid chiller installation for building air conditioning
Ferdinand Carré's ice-making device