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Reduce cooling costs.

After the chilled water is set to the correct temperature, it is possible to investigate methods of reducing cooling costs. When the ambient temperature is less than the chilled-water flow temperature, then it is possible to use "free cooling" as either pre-cooling or as a total cooling system (this is another reason to increase the flow temperatures; it makes free cooling applicable for longer periods of the year).

Free cooling is very suitable for plastics processing because ambient temperatures in many parts of the world are similar to chilled-water flow temperatures, and free cooling can be used to its best advantage.

The lower the ambient temperature, the greater the effect of free cooling. If the ambient temperature is [approximately equal to] 3[degrees]C less than the chilled-water flow water temperature, then the free cooling is generally enough to provide all the cooling load, and the chiller can be switched off. The only energy then used is that used to drive the fans of the free cooler.


* Increase chilled-water flow temperatures to the maximum to increase the benefit of free cooling.

* Seek advice from a specialist cooling company about the possibility of free cooling as a pre-cooler in your area. A specialist cooling company will also be able to provide calculations of energy saving and payback.

* Install as appropriate.

Note: Dr. Robin Kent is the author of Energy Management in Plastics Processing, published by Plastics Information Direct, and managing director of Tangram Technology Ltd., consulting engineers specializing in energy management in plastics processing,

Dr. Robin Kent--[c]Tangram Technology Ltd.


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Title Annotation:Energy-Saving Tip #24
Author:Kent, Robin
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:1USA
Date:May 1, 2012
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