Talking about the way to heat and to cool, there is direct heating method such as direct fire. In order to control the temperature precisely to avoid local heating, most industries tend to use indirect heating by applying heat transfer fluid. The most familiar fluid is water. However it is required to be high pressure at high temperature, and freeze in 0 degree, which has some restrictions. Therefore, organic heat transfer fluid like synthetic oil is effective. In this article, we would like to introduce some type of fluid in order to use heat transfer fluid, required performance, typical type and composition and so on.
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