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. 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.
Understanding the Cooling Mode Process of Air Source Heat Pumps
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. This drop prepares the refrigerant to absorb more outdoor heat, completing the closed-loop cycle that continuously moves thermal energy from outside to inside.
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. Heating and Cooling Modes By reversing the flow of refrigerant with a four-way valve, the same outdoor and indoor coils can switch roles to provide cooling in summer and heating in winter.
Understanding the Cooling Mode Process of Air Source Heat Pumps
Efficiency Factors and Performance Considerations Coefficient of Performance depends on temperature differential, refrigerant properties, airflow, and system design, with well-installed units often delivering two to four units of heat for each unit of electricity consumed. 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.
More About How does an air source heat pump work
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