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

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How does sub-cooling the liquid refrigerant entering the metering device benefit the A/C system?

It increases compressor efficiency

Sub-cooling the liquid refrigerant entering the metering device benefits the A/C system by increasing compressor efficiency. When the refrigerant is sub-cooled, it is at a lower temperature than the surrounding air, which reduces the amount of work the compressor needs to do to compress the refrigerant. This results in increased efficiency and reduced energy consumption. It's important to ensure that the refrigerant entering the metering device is sub-cooled to optimize the performance of the system.

Minimizing the presence of flash gas is important for the evaporator's efficiency rather than sub-cooling the liquid refrigerant. Noise levels are not directly affected by sub-cooling, and while sub-cooling can contribute to stabilizing refrigerant pressure, the primary benefit is the increase in compressor efficiency.

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It minimizes the presence of flash gas

It reduces noise levels

It stabilizes refrigerant pressure

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