Question

What is the function of a drier in a refrigeration system ?

• A. to add moisture to refrigerant
• B. to clean the condenser
• C. to clean the evaporator
• D. to absorb moisture from the refrigerant

Hint:

A drier holds a drying agent in the liquid line. Think of what it removes from the refrigerant.

Answer 1

The Correct Option is D

Step 1: Understand the problem moisture causes:
A refrigeration system should hold only refrigerant and a little oil. If water gets in, it causes trouble.
Water can freeze at the expansion valve or capillary tube and block the flow. Water can also make acid and rust the parts.

Step 2: Recall the job of the drier:
A drier is a small shell filled with a drying agent such as silica gel or activated alumina.
It sits in the liquid line, before the expansion device. The refrigerant passes through it and the drying agent takes up the moisture.
Many driers also trap small dirt particles.

Step 3: Match the function with the options:
The drier takes moisture out of the refrigerant. This matches option (D).

Step 4: Why the other options are wrong:
Option (A) is wrong because adding moisture would harm the system, which is the opposite of what a drier does.
Option (B) is wrong because the condenser is cleaned from outside with water or air, not by a drier.
Option (C) is wrong because the evaporator is not cleaned by a drier.

Final Answer:
The drier absorbs moisture from the refrigerant. This is option (D).