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Thread: secondary refrigernt additives
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01-09-2005, 11:32 AM #1
secondary refrigernt additives
please inform me about the kind of additives and its percentage we must add to the cooling water in the centeral a/c system,
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01-09-2005, 03:31 PM #2
Re: secondary refrigernt additives
When you select a secondary refrigerant (glycol) make sure it is a heat transfer grade of glycol. The inhibitors will be included in the glycol when you purchase them.
A heat transfer additive to depress the freezing point of a water mixture is different from anti-freeze. Do not use an automotive grade of glycol in a water circulation system.
The percentage of solution for the mixture should be based on the lowest expected temperature that can be seen at your location, or, at least 3-5C below the refrigerant evaporating temperature. Whichever is the lower temperature (cold ambient or 3-5C below the evaporating temperature).
The glycol manufacturer/supplier can provide you with sample bottles for periodic testing to verify the additives and inhibitors.
Here is a link to find additional information.
http://www.dow.com/heattrans/
Best wishes on your project,
US Iceman
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