This drop prepares the refrigerant to absorb more outdoor heat, completing the closed-loop cycle that continuously moves thermal energy from outside to inside. As the refrigerant changes phase, it releases the thermal energy collected outdoors plus the energy added by compression, providing efficient space heating and often domestic hot water preheating.
How the Outdoor Coil Absorbs Heat from Cool Air
This technology extracts warmth even when outside temperatures are cool, making it an efficient alternative to traditional combustion-based systems in many climates. A fan pulls air across the coil fins, improving heat transfer as the refrigerant changes from liquid to vapor without reaching boiling point at the prevailing pressure.
How Refrigerant Moves Heat Evaporation in the Outdoor Coil In the outdoor evaporator, low-pressure liquid refrigerant expands and evaporates, drawing in thermal energy from the ambient air even at temperatures well above absolute zero. Expansion and Return to the Outdoors After giving up its heat, the high-pressure liquid passes through an expansion valve or capillary tube, where its pressure and temperature drop sharply before returning to the outdoor evaporator.
How Outdoor Coil Heat Absorption Powers Efficient Heating
Core Components and Basic Layout The primary elements of an air source heat pump include an outdoor coil, an indoor coil, a compressor, and an expansion valve, arranged in a closed loop that circulates refrigerant. Condensation in the Indoor Coil Inside the building, the hot refrigerant vapor flows through the indoor condenser, where it condenses back into a liquid as it transfers heat to the indoor air or to a hydronic heating distribution system.
More About How does an air source heat pump work
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