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October 24, 2007Welcome to IndustrialChillers.com

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Industrial Chillers:

Industrial chillers can be air-cooled or water-cooled.

Water-cooled chillers incorporate the use ofcooling towers which improve

the chillers thermodynamic effectiveness as compared to air-cooled chillers.

This is due to heat rejection at or near the air's wet-bulb temperature rather

than the sometimes much higher dry-bulb temperature.

There are typically four types ofcompressors used on chillers.These are reciprocating, centrifugal, and screw and scroll.

These can be powered by electric, steam, or gas turbine power.

They produce their cooling effect through a process known as vapor-

compression.

Absorption chillers are also a type ofindustrial chiller.

The absorption chillers thermodynamic cycle is driven by an external heat

source. These heat sources can come from steam, hot water, or combustion.

Absorption chillers have very low electrical power requirements compared to

electrically powered chillers.

However, the heat source demand can be large and for the same tonnage

capacity, they require much larger cooling towers than vapor-compression

chillers.

Absorption chillers are considered very energy efficient where inexpensive,

high grade heat or waste heat is available.

Industrial chillers are usually complete, packaged, closed-loop systems.

They include the chiller, condenser, pumps, associated valves and

temperature control systems.

A closed loop industrial chiller circulates a coolant or water (with additives) ata constant set temperature and pressure.

The coolant or water flows from the chiller to the application point of use and

back.

Most industrial chillers use refrigeration as the cooling process.Some rely on air or water flowing over coils containing the coolant to regulate

temperature.

Water is the most commonly used coolant within process chillers, although

coolant mixtures (mostly water with a coolant additive to enhance heat

dissipation) are frequently employed.

A newer development in industrial water chillers is the use ofwater cooling

instead ofair cooling.In this system the condenser does not cool the refrigerant with air, water is

used.The water is cooled by a cooling tower. This reduces the energy requirements

allows a reduction in the size of the chiller.

This is due to the small surface area of the condenser and the absence of

cooling fans. The absence offans also reduces noise levels.

When determining the specifications for an industrial chiller the following should be

considered:

Power source

chiller rating

chiller cooling capacity

evaporator capacity

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