Process Fluid Recommendations
For recommendations on the correct process fluid to use in your chilling system, refer to the manufacturer of the equipment served by the chiller. Most manufacturers have a specified type of fluid for correct system operation. Use this document as a guide if the heat-transfer fluid is specified as water.
Using Water for the Chiller Process
Dimplex Thermal Solutions recommends the use of an industrial inhibited glycol and water mixture in its water chiller systems. Ethylene and Propylene are the two standard types of inhibited glycols that can be used in Koolant Koolers chillers.
Purposes of glycol in Koolant Koolers chillers:
Important glycol facts for use in Koolant Koolers chillers:
Ethylene Glycol (K-Kool-E)
Ethylene glycol is the standard heat-transfer fluid for most industrial applications. This type of glycol can be used in any application where a low-toxicity content is not required. Ethylene glycol has moderately acute oral toxicity and should not be used in processes where the fluid could come in contact with potable water, food, or beverage products.
Propylene Glycol (K-Kool-P)
Propylene glycol maintains generally the same freeze protection and corrosion and algae prevention as ethylene glycol, but has a lower level of toxicity. This type of glycol is more readily disposable than ethylene and safer to handle. Propylene glycol is commonly used in the food industry and applications when the user may come in frequent contact with the fluid.
Differences between Ethylene and Propylene Glycol
When selecting the water to mix with the glycol, use a good quality, filtered source that meets the requirements of the process machine manufacturer.
The location of the chiller and environmental concerns must be taken into account when selecting the proper mixture of glycol and water for the chiller process. A process which is located completely indoors and has no chance of freezing will require less glycol than a system located outdoors where low temperatures can cause the fluid to freeze and piping to burst. Applications that have a very low operating temperature (below 20°F) should use a glycol mixture equivalent to an outdoor system. After selecting the proper glycol and water types, use the following chart to determine the recommended mixture depending on application and location of the process. The glycol percentage figures in the chart below will apply to any brand of ethylene or propylene glycol.
|Application||Glycol %||Water %||Freeze Protection**||Burst Protection|
|Indoor Chiller and Process||30||70||5°F / -15°C||-20°F / -29°C|
|Outdoor Chiller / Low Temp. System||50||50||-35°F / -37°C||-60°F / -60°C|
Fluid Maintenance / Filtration
Maintaining clean process water and the proper glycol content will extent the life of the system and reduce costly down-time. If the chiller was not equipped with a fluid filter from the factory, it is highly recommended to install some sort of filtering system to remove unwanted dirt and debris. Refer to the “Chiller Maintenance” section of the manual for water and filter maintenance information.