What is the function of the metering device in the refrigerant cycle?

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Prepare for the SkillCat EPA Type 2 Test with interactive flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready to pass your exam!

Multiple Choice

What is the function of the metering device in the refrigerant cycle?

Explanation:
The metering device throttles the refrigerant, causing a deliberate pressure drop as liquid passes through a small opening. That reduction in pressure (and accompanying drop in temperature) allows the refrigerant to enter the evaporator as a low-pressure liquid–vapor mixture so it can absorb heat and begin to boil. This is why the function is a decrease in pressure. It doesn’t condense refrigerant—that happens in the condenser when high-pressure vapor releases heat and becomes liquid. It doesn’t evaporate refrigerant on its own either; evaporation occurs in the evaporator after the pressure has been lowered by the metering device.

The metering device throttles the refrigerant, causing a deliberate pressure drop as liquid passes through a small opening. That reduction in pressure (and accompanying drop in temperature) allows the refrigerant to enter the evaporator as a low-pressure liquid–vapor mixture so it can absorb heat and begin to boil. This is why the function is a decrease in pressure. It doesn’t condense refrigerant—that happens in the condenser when high-pressure vapor releases heat and becomes liquid. It doesn’t evaporate refrigerant on its own either; evaporation occurs in the evaporator after the pressure has been lowered by the metering device.

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