The heat transfer coefficient is used in calculating the heat transfer by convection or phase change between a fluid and soid.
h = ∆Q/A.∆T.∆t
ΔQ - heat input or heat lost, J
h - Heat transfer coefficient, W/(m2K)
A - Heat transfer surface area, m2
ΔT - difference in temperature between the solid surface and surrounding fluid area, K
Δt - time period, s
The overall heat transfer coefficient U is a measure of the overall ability to transfer heat. It is commonly applied to the heat exchanger's calculation and can be applied equally well to other problems.
U can be used to determine the total heat transfer between the two streams in the heat exchanger by the following relationship:
Q = UAΔTLM
Q - Heat transfer rate (W)
U - Overall heat transfer coefficient (W/(m²·K))
A - Heat transfer surface area (m2)
ΔTLM – log mean temperature (K)
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