The pressures in the evaporator and condenser coils of a refrigeration system have been noted to be equal. This indicates that
Match the List-I with List-Il:
A. Float valve
B. Automatic expansion valve
C. Internally equalized thermostatic expansion valve
D. Externally equalized thermostatic expansion valve
1. Constant degree of superheat at evaporator exit pressure
2. Constant degree of superheat at evaporator
3. Constant level of refrigerant in the evaporator
4. Constant pressure in the evaporator
Which of the following aspect is responsible for the operation of a thermostatic expansion valve?
Which of the following expansion valve is most suitable for application in air conditioning and refrigerant plants?
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.
An evaporator is also known as
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.
The heat transfer capacity of an evaporator depends on the following factors:
2. Temperature difference
3. Velocity of refrigerant
4. Thickness of the evaporator coil wall
5. Contact surface area
Q. Which of the above factors are valid?
Which of the following evaporators use surge tank as a accumulator?
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.
The evaporator charges the low pressure liquid refrigerant from the expansion valve into
The evaporator generally used in home freezers, ice cream cabinets etc. is
Most of the thermostatic expansion valves are set for a superheat of