A chiller is rated between one to 1000 tons of cooling energy.
There are three different types of chillers:(1) air, (2) water, and (3) evaporative condensed chiller.
There are four subcategories in each of the above categories for industrial chillers: (1) reciprocating, (2) centrifugal, (3) screw driven (4) and absorption chillers.
The first three types are mechanical chillers which are powered by electric motors, steam, or gas turbines.
An absorption chiller is powered by a heat source such as steam and uses no moving parts.