The Chiller System Components are divided according to their location into:
- Chiller System components: located in the refrigeration circuit, for its operation and control.
- Chiller system components: located in chilled water distribution.
Chiller Parts of Refrigeration Circuit for its Operation and Control:
The basic components of a chiller are the following:
- Evaporator Chiller: to transfer the heat from the water to the refrigerant in the circuit, thus generating ice water.
- Chiller compressors: to receive the refrigerant from the evaporator, raise its pressure and drive it to the circuit condenser.
- Chiller condenser: to dissipate the heat of the refrigerant into the environment.
- Expansion valve chiller: to recover low pressure and return low temperature to the refrigerant.
- Chiller cooling towers: They are responsible for cooling the water that goes to the chiller condenser.
- Chiller control board: It is in charge of controlling and optimizing the operation of the chiller’s refrigeration cycle.
Evaporator Chiller:
The evaporators used in chillers are:
- Shell and Flooded Tube Chiller Evaporator.
- Shell and Dry Tube Chiller Evaporator.
- Shell and Coil Type Chiller Evaporator.
- Double Tube Chiller Evaporator.
- Baudelot type chiller evaporators.
- Plate Chiller Evaporators.
Shell and Tube Chiller Evaporator Flooded.
- A shell and tube evaporator consists of a shell, and a large number of straight tubes parallel to each other.
- The coolant is inside the casing, and the water is inside the pipes. The coolant is fed through a float. The float is in charge of maintaining the constant level of refrigerant inside the casing.
- The refrigerant outlet of the evaporator is located at the top, To exit the casing, the refrigerant must be in a vapor state, in order to reach the exit point.
- They can be single-pass tubing or multi-pass.
- Use fins out of the tube.
- Steel pipes are used with ammonia.
- Copper tubes are used with freons.
- Ammonia has a high heat transfer coefficient, while Freons have a rather lower heat transfer coefficient, therefore fins are used on the refrigerant side.
- In case of freezing, the water freezes in the tube, which causes the tubes to burst, as the water expands when it freezes.
- They are not recommended for applications where the temperature of the liquid to be cooled may be below 3 ° C.
Shell and Dry Tube Chiller Evaporator:
- It is made up of a shell and a large number of tubes parallel to each other.
- A thermostatic expansion valve feeds the refrigerant to the evaporator.
- The refrigerant supply is carried out according to the superheat at the outlet of the exchanger.
- The refrigerant is inside the tubes.
- This evaporator requires less refrigerant charge.
- Fins are used inside the tubes.
- Water flows through the casing.
- The presence of baffles creates turbulence in the water, enhancing the transfer of heat.
- The deflectors increase the residence time of the water in the housing.
- In the case of freezing, the water has enough space in the shell for expansion.
Expansion valve chiller
Water cooled chiller parts
Chiller system componentes
chiller control board
chiller compressors
Where to learn all about chillers?
We have prepared a complete training in chilled water installations with chillers.
