Chemical Engineering Help With Heat Transfer Co-efficient

2.4 Heat Transfer Co-efficient:

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
Where

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

Where

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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