HVAC - EPA Certification Practice Exam

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What is the purpose of the expansion valve in an HVAC system?

To increase refrigerant pressure

To cool the refrigerant

To control refrigerant flow and decrease pressure

The expansion valve plays a crucial role in the HVAC system by controlling the flow of refrigerant into the evaporator coil while simultaneously decreasing the pressure of the refrigerant. As the high-pressure refrigerant from the condenser enters the expansion valve, it undergoes a significant drop in pressure, which allows it to expand and cool rapidly. This process is essential for enabling the refrigerant to absorb heat as it passes through the evaporator coil, where it transforms from a liquid into a gas. The valve regulates the flow, ensuring that the right amount of refrigerant circulates to match the cooling demand, providing efficiency and effectiveness in temperature regulation within the system. By understanding this function, one can see why controlling refrigerant flow and decreasing its pressure is central to the overall process of heat exchange in an HVAC system.

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To condense refrigerant vapor

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