What is Fouling factor What heat transfer coeeficient and it's unit What is LMTD Correction factor Design of she'll and tube hear exhanger

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This question is related to heat transfer and design of shell and tube heat exchanger.

Fouling factor is the measure of the rate at which unwanted material accumulates on heat transfer surfaces.
Heat transfer coefficient is the measure of the ability of a material to conduct heat.
LMTD Correction factor is used to correct the LMTD calculation for heat exchangers with non-uniform heat transfer coefficients.
Design of shell and tube heat exchanger involves determining the heat transfer area, tube diameter, tube layout, and baffle spacing.

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