NATE Air Conditioning and Heat Pumps Practice Exam 2025 – All-in-One Guide to Master Your Certification!

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Which component is responsible for the expansion of refrigerant in an air conditioning system?

Condenser

Evaporator

Expansion valve

The component responsible for the expansion of refrigerant in an air conditioning system is the expansion valve. This part plays a crucial role in regulating the flow of refrigerant into the evaporator. As the refrigerant passes through the expansion valve, it experiences a drop in pressure, which causes it to expand. This change transforms the refrigerant into a low-pressure, low-temperature gas, enabling it to absorb heat from the indoor environment once it enters the evaporator.

The expansion valve's function is vital for the overall efficiency and performance of the air conditioning system, as it ensures that the refrigerant is in the appropriate state for optimal heat exchange within the evaporator. Proper functioning of the expansion valve directly influences the system's ability to cool effectively.

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