Occasionally, you may have questions about how to select a heat transfer fluid, what to look for when purchasing and maintaining your heat transfer system, troubleshooting and more. Our Tips & How-To’s section is your source for all sorts of useful information.
The intent of this paper is to help you make an educated decision when selecting a heat transfer fluid. While most applications are unique, this guide should provide enough background to make choosing a fluid for your application much easier.
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For systems with a capacity under a few hundred gallons, it is typical to find they are open-to-atmosphere, in that there is no inert buffer (nitrogen blanket) between the fluid and the atmosphere (usually at the reservoir or expansion tank). These types of systems have unique considerations for fluid selection.
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Oxidation occurs when a fluid comes in contact with air at elevated temperatures and is one of the most common ways a fluid suffers from degradation, usually resulting in sludge formation within the system. While the various heat transfer fluid chemistries are affected at different temperatures, the most common petroleum-based fluids will experience oxidation at temperatures above 200°F. In fact, it's generally accepted that for every 15 degree increase in temperature (above 200°F), the rate of oxidation doubles.
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Regardless of system design, size or heat source, there are a few basic procedures that should be followed when starting up or shutting down your heat transfer system. Following these procedures will help maximize the life of your fluid by reducing incidents of thermal degradation.
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All hot oils (heat transfer fluids) have a limit to the time they can be utilized in an extruder. The key factor affecting service life is mainly the type of fluid being used. However, process temperatures and production rates are just a few of the more minor factors involved in determining the length of time between fluid changes.
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