Question:
The part of the refrigeration unit in which the refrigerant changes from vapour to liquid is called
The part of the refrigeration unit in which the refrigerant changes from vapour to liquid is called
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Refrigeration Phase Changes:
CONDENSER = Vapor $\rightarrow$ LIQUID (Rejects heat).
EVAPORATOR = Liquid $\rightarrow$ VAPOR (Absorbs heat cools milk).
CONDENSER = Vapor $\rightarrow$ LIQUID (Rejects heat).
EVAPORATOR = Liquid $\rightarrow$ VAPOR (Absorbs heat cools milk).
Updated On: Sep 15, 2026
- Evaporator
- Condenser
- Compressor
- Throttle valve
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Vapour Compression Refrigeration (VCR) cycle thermodynamics: in the Condenser, superheated high-pressure refrigerant vapor rejects its sensible and latent heat of condensation to cooling water or atmospheric air, changing phase from vapor to high-pressure subcooled liquid.
Key Formula or Approach:
\[ \text{VCR Condenser Process: Superheated Vapor } (P_{\text{high}}, T_{\text{high}}) \xrightarrow{-\mathbf{q_{\text{out}} \text{ (Heat Rejected)}}} \mathbf{Saturated / Subcooled \text{ } Liquid} \]
Step 2: Detailed Explanation:
In the thermodynamics of Vapour Compression Refrigeration (VCR) systems:
1. Compressor: Compresses low-pressure refrigerant vapor to high-pressure superheated gas.
2. Condenser (B): The high-pressure, high-temperature refrigerant vapor flows through heat exchanger tubes where it rejects heat to cooling water (shell-and-tube evaporative condenser) or air. The refrigerant changes phase from Vapour to Liquid at constant condensing pressure.
3. Throttle Expansion Valve: Flashes high-pressure liquid to low-pressure two-phase mixture.
4. Evaporator: Liquid refrigerant absorbs heat from milk/glycol and evaporates from Liquid to Vapour.
Step 3: Final Answer:
Therefore, the part where refrigerant changes from vapour to liquid is Condenser, corresponding to option (B).
Vapour Compression Refrigeration (VCR) cycle thermodynamics: in the Condenser, superheated high-pressure refrigerant vapor rejects its sensible and latent heat of condensation to cooling water or atmospheric air, changing phase from vapor to high-pressure subcooled liquid.
Key Formula or Approach:
\[ \text{VCR Condenser Process: Superheated Vapor } (P_{\text{high}}, T_{\text{high}}) \xrightarrow{-\mathbf{q_{\text{out}} \text{ (Heat Rejected)}}} \mathbf{Saturated / Subcooled \text{ } Liquid} \]
Step 2: Detailed Explanation:
In the thermodynamics of Vapour Compression Refrigeration (VCR) systems:
1. Compressor: Compresses low-pressure refrigerant vapor to high-pressure superheated gas.
2. Condenser (B): The high-pressure, high-temperature refrigerant vapor flows through heat exchanger tubes where it rejects heat to cooling water (shell-and-tube evaporative condenser) or air. The refrigerant changes phase from Vapour to Liquid at constant condensing pressure.
3. Throttle Expansion Valve: Flashes high-pressure liquid to low-pressure two-phase mixture.
4. Evaporator: Liquid refrigerant absorbs heat from milk/glycol and evaporates from Liquid to Vapour.
Step 3: Final Answer:
Therefore, the part where refrigerant changes from vapour to liquid is Condenser, corresponding to option (B).
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