Thermal plate is the one that transfers heat. In brazed plate heat exchangers and PHEs, the end plates do not transfer any heat. End plates in brazed plate heat exchangers and PHEs simply contain the fluid and prevent it from touching the pressure plates, which are generally made of mild steel and mot not suitable for a particular fluid.
Thus, in a brazed plate heat exchanger and PHE with a total of 40 plates, only 38 plates are thermal plates, regardless of the number of passes.
However, if one connector plate is used in between the plate pack, so that on fluid exchangers heat with two others, the plates on either side of the connector plate also do not transfer any heat, and out of total of 20 plates, only 16 will be thermal plates.
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Hi sir very good post, thank you for giving such a valuable information about heat exchanger
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