Question:
The expansion device used in domestic refrigerator working on vapour compression cycle is
The expansion device used in domestic refrigerator working on vapour compression cycle is
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For small, constant-load domestic appliances, the capillary tube is the ideal expansion device because it is simple, has no moving parts, and is highly cost-effective.
Updated On: Aug 7, 2026
- Solenoid valve
- Thermostatic valve
- Hand operated valve
- Capillary tube
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
An expansion device is one of the four essential components of a vapor compression refrigeration cycle (the others being the compressor, condenser, and evaporator).
The expansion device serves two primary functions:
1. It reduces the pressure of the high-pressure liquid refrigerant leaving the condenser to the low-pressure state required in the evaporator.
2. It regulates the flow of liquid refrigerant into the evaporator to match the heat load.
Step 2: Detailed Explanation:
In domestic refrigerators, the refrigeration load is small and relatively constant.
The expansion device must be simple, reliable, inexpensive, and maintenance-free.
A capillary tube is the standard expansion device used in these small-capacity hermetic refrigeration systems.
It is a long, copper tube with a very small inner diameter (typically 0.5 to 2.0 mm).
As the high-pressure liquid refrigerant flows through this narrow tube, friction and acceleration create a significant pressure drop.
The pressure drop is determined entirely by the tube's length and diameter, making it a passive expansion device with no moving parts.
For comparison:
- Solenoid valves (A) are electrically operated on/off valves, not expansion devices.
- Thermostatic expansion valves (B) are active flow-control devices used in larger commercial refrigeration plants.
- Hand-operated valves (C) are used in industrial systems where manual adjustment is feasible.
Therefore, the capillary tube is the correct choice for domestic refrigerators.
Step 3: Final Answer
The expansion device used in a domestic refrigerator working on a vapor compression cycle is the capillary tube.
An expansion device is one of the four essential components of a vapor compression refrigeration cycle (the others being the compressor, condenser, and evaporator).
The expansion device serves two primary functions:
1. It reduces the pressure of the high-pressure liquid refrigerant leaving the condenser to the low-pressure state required in the evaporator.
2. It regulates the flow of liquid refrigerant into the evaporator to match the heat load.
Step 2: Detailed Explanation:
In domestic refrigerators, the refrigeration load is small and relatively constant.
The expansion device must be simple, reliable, inexpensive, and maintenance-free.
A capillary tube is the standard expansion device used in these small-capacity hermetic refrigeration systems.
It is a long, copper tube with a very small inner diameter (typically 0.5 to 2.0 mm).
As the high-pressure liquid refrigerant flows through this narrow tube, friction and acceleration create a significant pressure drop.
The pressure drop is determined entirely by the tube's length and diameter, making it a passive expansion device with no moving parts.
For comparison:
- Solenoid valves (A) are electrically operated on/off valves, not expansion devices.
- Thermostatic expansion valves (B) are active flow-control devices used in larger commercial refrigeration plants.
- Hand-operated valves (C) are used in industrial systems where manual adjustment is feasible.
Therefore, the capillary tube is the correct choice for domestic refrigerators.
Step 3: Final Answer
The expansion device used in a domestic refrigerator working on a vapor compression cycle is the capillary tube.
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