A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
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Average temperature drop

Temperature drop averaged over the heat-transfer surface.

Comment. We distinguish between:
a) mean arithmetic temperature drop


b) mean logarithmic temperature drop

c) mean integral temperature drop

where Δt is the local temperature drop; Δt1, Δt2 are the values of the local temperature drop at the beginning and the end (in the direction of flow of the heat-transfer agent) of the heat-exchange system, F is the area of the heat transfer surface.

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