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. Cold climates may require specialized refrigerants, larger outdoor coils, or auxiliary backup heating to maintain performance as outdoor temperatures fall, while proper sizing and airflow are essential to avoid efficiency losses and ensure consistent comfort.
How Air Source Heat Pumps Perform in Cold Weather
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. Compression and Temperature Rise The vapor refrigerant is drawn into the compressor, where mechanical work raises its temperature and pressure significantly, transforming it into a high-temperature, high-pressure superheated vapor.
Refrigerant absorbs heat as it evaporates in the outdoor evaporator, is compressed to a higher temperature and pressure, releases warmth in the indoor condenser, and then returns to the outdoor unit to repeat the cycle. 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 Air Source Heat Pumps Perform in Cold Weather
In cooling mode, the indoor coil acts as the evaporator that absorbs heat from indoor air, while the outdoor coil releases heat to the exterior, functioning much like a conventional air conditioner but often with greater efficiency. 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.
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