A chiller is a device for causing a cold based on the condensation or absorption of a liquid.
Types of chillers:
Chillers are divided into two categories of condensation and absorption chillers. Condensation chillers, using electrical energy and absorption chillers, generate heat and cold by using thermal energy.
– Compressed chiller:
In compressed air chillers, gas is compressed first by compressor. This gas is then condensed into the condenser by water or air, and it is converted to liquid. This liquid passes through the expansion valve or the capillary tube into a coolant (evaporator) which is placed at a lower pressure, which causes the pressure drop The evaporation of the liquid makes it so that the coolant fluid, by capturing its thermal evaporation heat from the cooling medium, causes cooling in the materials associated with the cooling unit. Then evaporated gas is transferred to the compressor and this repeat cycle Gets
Types of compaction chillers
۱-Compressor Chiller
۲-screw compression chiller
– Absorption chiller

In adsorption chillers, unlike compact chillers, absorbers and heat generators (generators) are used instead of compressors. The most common cooling in absorbing chillers is the lithium bromide system. In this system, in the absorber of water vapor, it is absorbed by concentrated lithium, and in the heat generator part, the water becomes steam by heat. The water vapor in the condenser, which has a pressure of 0.1 atmospheres, becomes liquid, and then in the cooler, which is pressurized to a pressure of 0.01 atmospheres, the water returns to the vapor to evaporate its cryogenic heat from the cooling medium Causing a cooling down, then the water vapor generated in the coolant is transferred to the absorber and the cycle repeats again.
Types of absorbing chillers
۱- Single effect
They are divided into three categories of single-effect chillers with steam supply, single effect with hot water supply (above 100 ° C) and single effects with hot water supply (below 100 ° C), which are similar in operation and all have At least one thermal generator.
۲- Double effect
Which are classified into two groups of two effects with steam feed and two direct flame effects. These chillers are the only new generation of absorbing chillers and have a more complete refrigeration cycle than single-effect absorption chillers.