Glycol Chilling unit Use, Application, and Feature

Glycol is a class of organic compounds that belong to the alcohol family. When mixed with water and pumped through the pipes of a chilling system, glycol serves to slow the rate of freezing. It helps maintain temperature consistency in the application. Some glycol products also work to inhibit corrosion and bacterial growth within the pipes of the chilling system.

Glycol comes in two varieties that should never be mixed together: ethylene glycol and propylene glycol. Both types offer the same relative level of freeze protection. Both also help to guard against corrosion. Some grades of both types of glycol also help to prevent the growth of algae and bacteria within the chiller.

Ethylene glycol is a moderately toxic chemical that has a sweet taste and can be harmful if swallowed. For this reason, it should not be used in potable water or food processing systems when leakage is a possibility. Ethylene glycol has more widespread use due to its lower purchase price. Industrial applications like ice rinks and factories requiring large volumes of coolant find this to be the most economical choice of glycol.

Propylene glycol has a lower level of toxicity and is considered to be a food-grade antifreeze. This type of glycol is safer to handle than ethylene and can be more easily disposed of. Propylene glycol is commonly used in the food industry or in industrial refrigeration systems where people may come into contact with the fluid. Propylene glycol can also become more viscous than ethylene, even slightly affecting the heat exchange rate when used at very low temperatures. It is important to note that you should never mix different types or brand names of glycol, as this leads to product congealing and the clogging of filters in the refrigeration system —potentially causing problems with heat transfer and fluid flow.

Each glycol chiller comes with its own set of manufacturer recommendations for the best type of water to use for that system. Although city water may be accepted initially, it is almost never recommended that de-ionized water be maintained for the long term as it could have adverse effects on certain metals in the chiller.

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