Refrigerants in the suction line are in what phase and state?

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Multiple Choice

Refrigerants in the suction line are in what phase and state?

Explanation:
On the suction line, the refrigerant is on the low-pressure side after it has absorbed heat in the evaporator. It leaves the evaporator as vapor and is cooler than ambient, so it is cold vapor. Liquid refrigerant in the suction line would risk the compressor, and a liquid–vapor mix isn’t the typical state reaching the compressor. The key idea is that the suction line carries low-pressure, low-temperature vapor to the compressor, and it’s kept as vapor (often with a bit of superheat to ensure no liquid enters the compressor).

On the suction line, the refrigerant is on the low-pressure side after it has absorbed heat in the evaporator. It leaves the evaporator as vapor and is cooler than ambient, so it is cold vapor. Liquid refrigerant in the suction line would risk the compressor, and a liquid–vapor mix isn’t the typical state reaching the compressor. The key idea is that the suction line carries low-pressure, low-temperature vapor to the compressor, and it’s kept as vapor (often with a bit of superheat to ensure no liquid enters the compressor).

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