Test: Condensers, Evaporators & Expansion Devices - 1 - Mechanical Engineering MCQ

Thermostatic expansion valve is also known as T-X valve.
Three important featured of this makes it most suitable for application in air conditioning and refrigerant plants and these are:
- capable of meeting varying load condition
- maintains constant degree of superheat
- it keeps evaporator always full of the refrigerant regardless of change in cooling load.

The evaporator is also known as a cooling coil, a chilling or a freezing. The evaporator cools by using the refrigerant’s latent heat of vaporization to absorb heat from the medium being cooled.

In a flooded evaporator, constant liquid refrigerant level is always maintained. A float control valve is used as an expansion device which maintains constant liquid level in the evaporator. The liquid refrigerant from the receiver passes through a lower side float control valve and asccumulator before entering the evaporator coil. The accumulator is also called surge tank which serves as a storage tank for the liquid refrigerant. It maintains a constant liquid level in the evaporator and helps to seperate the liquid refrigerant from the vapour returning to the compressor.