Process Equipment and Plant Design
LMTD correction factor is used in heat exchanger design for

Counter flow of hot and cold fluids
Double pipe heat exchanger
Fouling fluids
Multipass shell and tube heat exchanger

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Neither A nor B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Economic limit reached, when the plant cost exceeds the saving of steam
Both A & B

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