What state is the refrigerant in just before entering the evaporator?

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Multiple Choice

What state is the refrigerant in just before entering the evaporator?

Explanation:
The refrigerant entering the evaporator is a low-pressure liquid. After it’s condensed into a high-pressure liquid, the expansion valve drops the pressure (and temperature). This produces a cold, low-pressure liquid that flows into the evaporator, where it begins to absorb heat and vaporize. Inside the evaporator it may enter as a largely liquid (often subcooled) or as a small amount of two-phase liquid-vapor, but the important point is that it’s not yet a vapor when it first enters. Thus, the state just before entering the evaporator is a low-pressure liquid.

The refrigerant entering the evaporator is a low-pressure liquid. After it’s condensed into a high-pressure liquid, the expansion valve drops the pressure (and temperature). This produces a cold, low-pressure liquid that flows into the evaporator, where it begins to absorb heat and vaporize. Inside the evaporator it may enter as a largely liquid (often subcooled) or as a small amount of two-phase liquid-vapor, but the important point is that it’s not yet a vapor when it first enters. Thus, the state just before entering the evaporator is a low-pressure liquid.

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