ESCO Air Conditioning Practice Exam

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In a direct expansion evaporator system, the refrigerant enters the evaporator as

  1. Amixture of gas with some liquid

  2. Amixture of liquid with some "flash-gas"

  3. Liquid only

  4. Gas only

The correct answer is: Amixture of gas with some liquid

In a direct expansion evaporator system, the refrigerant enters the evaporator as a mixture of gas with some liquid. This is because as the refrigerant flows into the evaporator coil, it initially contains both gaseous and liquid phases. The refrigerant absorbs heat from the surrounding air, causing the liquid to evaporate into a gas, resulting in a mixture of gas and liquid within the evaporator coil. This process allows for efficient heat transfer and cooling within the system.

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