Question

For small cold storage, the rooms are cooled _________.

• A. by air
• B. by water
• C. by brine
• D. by hydrogen

Hint:

Small cold storages use a simple direct system with a cooling coil and fan circulating air. Brine is for large plants.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A cold storage keeps perishable goods at low temperature. The room can be cooled directly by air, or indirectly by a secondary fluid such as brine.

Step 2: Key Approach:
Small cold storages have a short refrigerant line and a small load. So the simple, direct method is chosen. Large plants with long piping use a secondary coolant.

Step 3: Detailed Explanation:
In a small cold storage, the evaporator (cooling coil) with a fan is placed in the room.
The fan circulates air over the cold coil, and this cooled air cools the room and the stored goods.
This arrangement is cheap and has no pump or brine tank.

Step 4: Why the other options are wrong.
Water cannot be used to cool a room below its freezing point, 0 degrees C. Cold storages often need low temperatures.
Brine cooling is used in large cold storages, where one central plant cools many rooms.
Hydrogen is not a cooling medium for rooms.

Final Answer:
Small cold storage rooms are cooled by air. This is option (A).