A chiller is an equipment removing heat from a liquid via a vapor-compression or absorption refrigeration cycle in a closed loop system. The refrigerant is then pumped to a location where the waste heat is transferred to the atmosphere.
The liquid can then be circulated through a heat exchanger to cool down equipment, or another process stream. As a necessary by-product, refrigeration will create waste heat that must be released to atmosphere, or for greater efficiency, recovered for heating purposes.
In a cooling application, generally cooling water is circulated in the chiller plant. Sometimes, glycol solution replaces the liquid solution used to remove heat from the process. The warm/ hot fluid returns to the chiller. It is by the cooling solution by which the heat transfers from the process to the chiller.
The chemical compound used in the chiller plant is termed as a refrigerant. Any chiller plant works on the basic principal of refrigeration cycle i.e. compression of liquid to gas and then back to liquid. Depending upon the temperatures required this process of compression is altered by changing the Area required for the plant to phase change.
There are mainly three types of chillers:
Air Condensed Chiller
Water Condensed Chiller
Evaporative Condensed Chiller
These three types are further 10 subcategorised the sub categorised into four subcategories reciprocating, centrifugal & screw driven which are used in mechanical chillers and the fourth is absorption chillers. The mechanical chillers are energised by electric motors, steam, or gas turbines. An absorption chiller is energised by a heat source such as steam and uses no moving parts.
There are four basic components of mechanical compression are evaporator, compressor, condenser and the expansion valves through which the refrigerant passes. The pressures and temperatures of the operator in the chiller is operated lower than the condenser.
Chilled water is used to dehumidify and cool air in mid- to large-size industrial, commercial, and institutional facilities. Water chillers can be air-cooled, water-cooled, or evaporatively cooled. Water-cooled mechanisms can provide efficiency and environmental impact advantages over air-cooled mechanisms.
The other way to categorise the chiller is vapour compression chiller and vapour absorption chiller. A vapour compression chiller makes a refrigerant move around Chiller mechanically using an electronic compressor. These compressors are of two types water cooled and air cooled. The other vapour absorption chiller which uses a heat source rather than a compressor the refrigerant will use a heat source to move the refrigerant around the system rather than using a mechanical compressor. The refrigerant moves basis the different temperature and pressure.
Water cooled chillers use evaporation of waters to dissipate heat is Water has higher capacity to dissipate heat as compared to air cooled chiller.
The two types of condensers used in chillers are based on air and water. As the name suggests the one based on Air uses the air to cool the gas back to liquid. Similarly, in a water based condenser, water from a cooling tower cools the refrigerant.
Indus Aqua Tech provide extensive range of cooling systems and chilling plants suitable for industries of any niche and size. We design our solutions to meet the needs of our clients which are also up to date with the latest technology.