A commercial chiller is a crucial component of any big building. It makes the indoor environment cool and comfortable for the occupants of the place and also cool the machines down, thus making them function perfectly. There three basic types of chillers available, air chillers, water chillers and evaporative chillers. These chillers also have their subtypes, which are also mentioned below.
Let’s take a look at the kinds of chillers available.
An air chiller can either be used as a single unit or multiple configurations. Air chillers come in different sizes varying from small units to 100+ tons. They work best when it comes to cooling large indoor spaces such as offices. Unlike a water-cooled chiller that uses water as a condensing source, an air chiller uses air as a condensing source. In an air chiller, a fan moves the air over the coil.
Just like air chillers, water chillers are also a common technology in big buildings. They are very helpful when it comes to cooling down equipment and fluid in an industrial setup. From process use to space chilling, they have a variety of different applications. A water chiller makes use of water as a condensing source. The only difference between a water chiller and an air chiller is that a water chiller sends water to a cooling tower to cool the water down in the chiller.
Evaporative Condensed Chiller
One of the most common to water and air chillers is an evaporative condensed chiller. These chillers come in a variety of sizes ranging from 20 tons to 200 tons. However, one must choose a chiller that fits their needs best. Constant recalculation of water maximizes the heat rejection in an evaporative chiller. It also results in wetting of the condenser tubes. Meanwhile, air is pulled over the tubes by fans, resulting in evaporation of water and rejection of heat to the atmosphere.
Subtypes of Chillers
Here are some of the subtypes of chillers.
Rotary Screw Chillers
Screw compressors are also known as helical compressors. The rotation of helical rotors results in the direct volume reduction. Its capacity varies from 20 to 400 tons, and an inlet valve or a speed drive controls it.
One of the key features of a centrifugal chiller is the provision of good cooling capacity with a compact design. These chillers operate through an impeller which is more of a water pump. These chillers are high capacity, and have the ability to handle more than 150 tons.
Absorption chillers use heat as a source, instead of using a mechanical compressor. Such chillers use two kinds of liquids, one to absorb and the other one to cool. The absorption liquid is ammonia or in some cases, lithium bromide, while the cooling liquid is water.
These were just a handful of the many subtypes of chillers available. It is important to understand the features of different kinds of chillers. You never know when you might have to buy one.