ESCO Air Conditioning Practice Exam 2025 - Free AC Certification Practice Questions and Study Guide

Question: 1 / 400

Which part of the refrigeration cycle is where liquid refrigerant expands and cools?

Compressor

Condenser

Evaporator

Expansion valve

The part of the refrigeration cycle where liquid refrigerant expands and cools is the expansion valve. This component plays a crucial role in the refrigeration process by allowing the high-pressure liquid refrigerant to expand into a low-pressure mixture of liquid and vapor. As it passes through the expansion valve, the refrigerant experiences a drop in pressure, which leads to a significant reduction in temperature.

This cooling effect is vital because it prepares the refrigerant for the next stage of the cycle, which takes place in the evaporator. In the evaporator, the low-pressure refrigerant absorbs heat from the surrounding environment, further enabling the cycle of heat exchange that is essential for refrigeration. The expansion valve effectively sets the stage for the refrigerant to absorb heat efficiently, which is fundamental for the cooling process in any refrigeration or air conditioning system.

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