Water chillers are among the oldest method of providing a cooling source to an internal heat load be it a room air conditioning unit, air handling unit or an injection-moulding machine. Generally engineers divide water chillers into two categories one being Air Conditioning and the other being Process Cooling chillers. However, for both categories the objectives are the same to “cool water” and deliver it to the heat source by way of a circulation pump. The process of achieving this is the same for both air conditioning and process cooling, by way of a refrigeration circuit. We only make destination between both chillers by their application.
Depending to the cooling capacity of the chiller some smaller capacity chillers are manufactured complete with the refrigeration circuit, water buffer tank, water flow switch and pressurisation unit. These chillers normally operate at low pressures not exceeding 2 bar water pressure. The larger capacity chillers normally do not come complete with water buffer tanks or circulation pumps. These chillers are usually used for applications where there are very high cooling loads such as a large office block or manufacturing facilities and water pressure exceeds 3 bar.
Water chillers are used in a wide range of applications from
- Air Conditioning
- Food processing
- Drink Industry
- Pharmaceutical industry
- Printing and packaging Industry
- Data Centre cooling
Types of water Chillers
There are several different types of water chillers on the market. They refer to the type of compressor they use in the refrigeration process. These are the most common chillers:
- Rotary chillers (hermetically sealed compressor) use rotary compressorsand are becoming more common in larger chillers use two meshing helical screws, known as rotors, to compress the gas. These compressors are becoming more common due to the fact they are very efficient to operated when used in conjunction with an inverter to control the compressor speed.
- Reciprocating chillers (semi-hermetically sealed compressors)contain pistons, crankshafts, suction valves and discharge valves.
- Centrifugal chillers (semi-hermetically sealed compressors)use centrifugal impellers and high rotational speeds to work.
- Screw chillers (semi -hermetically sealed compressors)use screw shafts to compress the refrigerant gas.