Finned pack heat exchangers — coils — find wide application in air handling units (AHU) and ventilation systems. Engineers often approach the rating of finned pack heat exchangers from one side only, whether that is the fluid side or the air side. As a result, a number of myths and suppositions endure in the industry, leading to errors and misunderstandings. This article deals with water heating and cooling coils, and focuses on the properties of the water or brine (glycol).
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