Question

Difference between dry and wet compression in refrigeration

Answer 1

What do you mean by wet compression and dry compression in vapour compression refrigeration system?

2 ANSWERS



Rishikesh Ravi, former Intern at Hindustan Aeronautics Limited (2016)

Answered May 1

Thanks for the A2A

In a Carnot refrigeration cycle, consider the compression stage.



This is represented by the process 1–2 in the T-s diagram given above. It is an Isentropic compression process of the refrigerant where work is supplied to the compressor to increase the pressure. If the refrigerant is found in both liquid and vapour form at this stage, it is called wet compression. If the refrigerant is purely in a vapour form, it is called dry compression.

Wet compression is especially difficult with reciprocating compressors (especially at higher pressures). The liquid droplets may sometimes damage the compressor.

Answer 2

Answer:

• If the refrigerant or liquid inside the compressor is completely gaseous during compression, it is called dry compression. If the refrigerant or liquid is partially liquid during compression, even slightly, it is called wet compression.
• If the refrigerant or liquid inside the compressor is completely gaseous during compression, it is called dry compression. If the refrigerant or liquid is partially liquid during compression, even slightly, it is called wet compression.
• Dry compression creates more friction than wet compression. This is because the lubricant in wet pressing reduces the amount of contact between the surfaces being pressed.
• The dry compression test does not use water and is used to determine the compressibility of a material when it is dry.
• #SPJ3

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