This technology extracts warmth even when outside temperatures are cool, making it an efficient alternative to traditional combustion-based systems in many climates. Key Components and Their Roles Component Function Outdoor Coil Absorbs heat from outside air as refrigerant evaporates Compressor Increases refrigerant pressure and temperature, driving the heat transfer cycle Indoor Coil Releases heat to indoor air or heating distribution system as refrigerant condenses Expansion Valve Reduces refrigerant pressure and temperature, preparing it for outdoor heat absorption Fans and Blowers Move air across coils to improve heat transfer and distribute conditioned air.
How Refrigerant Moves Heat Through Evaporation and Compression
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. 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. This step is crucial because it moves the refrigerant to a temperature level that allows heat to flow into the indoor space when the condenser coil is colder than the refrigerant.
How Refrigerant Moves Heat Through Evaporation and Compression
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. 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.
More About How does an air source heat pump work
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