Question:
High pressure liquid refrigerant is reduced to the low pressure of the evaporator by passing it through which of the following pressure reducing devices?
High pressure liquid refrigerant is reduced to the low pressure of the evaporator by passing it through which of the following pressure reducing devices?
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Remember the two pressure zones in a refrigeration system:
- High-pressure side \(\rightarrow\) Condenser (rejects heat).
- Low-pressure side \(\rightarrow\) Evaporator (absorbs heat).
The expansion device is the boundary component that drops the pressure from the high side to the low side.
- High-pressure side \(\rightarrow\) Condenser (rejects heat).
- Low-pressure side \(\rightarrow\) Evaporator (absorbs heat).
The expansion device is the boundary component that drops the pressure from the high side to the low side.
Updated On: Jul 23, 2026
- Stagger device
- Expansion device
- Low stage device
- Compression device
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
A standard vapor compression refrigeration system consists of four primary components: a compressor, a condenser, an expansion device, and an evaporator.
The system operates by circulating a refrigerant, which undergoes phase changes at different pressures to absorb heat from the low-temperature space and reject it to the high-temperature environment.
Step 2: Detailed Explanation:
Let us analyze the role of each component in the refrigeration cycle:
- Compressor: Draws low-pressure vapor from the evaporator and compresses it to a high-pressure, high-temperature vapor.
- Condenser: Cools and condenses the high-pressure vapor into a high-pressure liquid by rejecting heat to the surrounding air or water.
- Expansion Device (Expansion Valve):
The high-pressure liquid refrigerant leaving the condenser cannot enter the evaporator directly because the evaporator operates at a much lower pressure and temperature.
The expansion device acts as a restriction in the flow line, causing a sudden pressure drop (throttling process).
As the high-pressure liquid passes through this restriction, its pressure drops to the evaporator pressure.
This sudden pressure drop causes a portion of the liquid to flash into vapor, which cools the remaining liquid refrigerant to its saturation temperature.
- Evaporator: The low-pressure, low-temperature liquid-vapor mixture absorbs heat from the cold storage space, vaporizing completely before returning to the compressor.
Step 3: Final Answer:
The high-pressure liquid refrigerant is reduced to the low pressure of the evaporator by passing it through an expansion device.
A standard vapor compression refrigeration system consists of four primary components: a compressor, a condenser, an expansion device, and an evaporator.
The system operates by circulating a refrigerant, which undergoes phase changes at different pressures to absorb heat from the low-temperature space and reject it to the high-temperature environment.
Step 2: Detailed Explanation:
Let us analyze the role of each component in the refrigeration cycle:
- Compressor: Draws low-pressure vapor from the evaporator and compresses it to a high-pressure, high-temperature vapor.
- Condenser: Cools and condenses the high-pressure vapor into a high-pressure liquid by rejecting heat to the surrounding air or water.
- Expansion Device (Expansion Valve):
The high-pressure liquid refrigerant leaving the condenser cannot enter the evaporator directly because the evaporator operates at a much lower pressure and temperature.
The expansion device acts as a restriction in the flow line, causing a sudden pressure drop (throttling process).
As the high-pressure liquid passes through this restriction, its pressure drops to the evaporator pressure.
This sudden pressure drop causes a portion of the liquid to flash into vapor, which cools the remaining liquid refrigerant to its saturation temperature.
- Evaporator: The low-pressure, low-temperature liquid-vapor mixture absorbs heat from the cold storage space, vaporizing completely before returning to the compressor.
Step 3: Final Answer:
The high-pressure liquid refrigerant is reduced to the low pressure of the evaporator by passing it through an expansion device.
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