A chiller is a mechanical machine that removes heat from a liquid via a vapor-compression/ absorption refrigeration cycle.
It is a water-cooled air conditioning system that cools inside air, creating a more comfortable environment.
Based on the refrigeration cycle, Chiller is of two types:
a) Vapor compression chiller
b) Absorption refrigeration chiller
Based on the Condensation process, It is two types.
a) Air-cooled chiller
b) Water-cooled chiller
Chiller system components:
1. Compressor
2. Condensor
3. Expansion valve
4. Evaporator
5. Water-cooled chiller
6. Air-cooled chiller
7. Cooling Tower
8. Primary pump
9. Secondary pump
In this system, there are 3 cycles:
1) Water cycle between AHU and Chiller
2) Vapor compression cycle ( for details click here)
3) Air/ Water cycle between Condenser and Cooling tower
( working principle of Cooling Tower- Click here )
Working of the Chiller system:
Chiller circulates chilled water to AHU in order to transfer the heat from the air to water and chilled water converts to hot water.
This hot water comes to the evaporator side of the chiller where heat transfers to low-temperature liquid refrigerant.
After heat absorption, low-temperature liquid refrigerant converts into low-temperature vapor refrigerant and it passes into the compressor which compresses the low-temperature vapor refrigerant and converts into high-temperature vapor refrigerant.
This vapor refrigerant will go to the condenser side of the chiller where heat transfers to the air/water side of the condenser. This helps to remove heat from the hot vapor refrigerant of the condenser side.
After absorbing the heat from the hot vapor refrigerant, it will go to the cooling tower/ air-cooled condenser to get cool and this process continues.
Water-cooled chiller and air-cooled chiller to be covered in the next post.
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