Question

The part of a vapour compression refrigeration in which the vapour refrigerant changes to liquid is called as .............

• A. Compressor
• B. Throttling valve
• C. Evaporator
• D. Condenser

Hint:

To remember phase changes in VCRS:
- Condenser = Vapor \(\rightarrow\) Liquid (Heat Rejection)
- Evaporator = Liquid \(\rightarrow\) Vapor (Heat Absorption)

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
A Vapor Compression Refrigeration System (VCRS) utilizes a closed thermodynamic cycle consisting of four main stages to transfer heat from a cold region to a warm region.

Step 2: Detailed Explanation:
Let us review the functions of the four primary components in a VCRS cycle:
1. Compressor: Takes in low-pressure, low-temperature superheated vapor refrigerant from the evaporator and compresses it to a high-pressure, high-temperature state, requiring external work.
2. Condenser: The high-temperature, high-pressure vapor refrigerant enters this heat exchanger.
Heat is rejected from the refrigerant to the surrounding cooling medium (air or water), causing the vapor to condense into a high-pressure liquid state.
3. Throttling (Expansion) Valve: The high-pressure liquid refrigerant expands isenthalpically, which drops its pressure and temperature.
4. Evaporator: The low-temperature liquid-vapor mixture absorbs heat from the cold storage space, vaporizing the refrigerant completely before it returns to the compressor.

Step 3: Final Answer:
The component where the vapor refrigerant changes phase to a liquid is the Condenser.