This drop prepares the refrigerant to absorb more outdoor heat, completing the closed-loop cycle that continuously moves thermal energy from outside to inside. 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 Closed Loop Cycle Heat Transfer Process
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. 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.
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. 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.
Understanding the Closed Loop Cycle Heat Transfer Process
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. 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.
More About How does an air source heat pump work
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