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Heat Exchanger LMTD Calculator

Find LMTD for counter-flow and parallel-flow heat exchangers.

CALCULATE

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Formulas

LMTD = (ΔT1 - ΔT2) / ln(ΔT1/ΔT2)

Counter-flow is always more efficient (higher LMTD) than parallel-flow.

LMTD Method

Used to size heat exchangers. Q = U × A × LMTD. Counter-flow: hot inlet opposite cold inlet (most efficient). Parallel: both enter same end. Counter-flow always gives higher LMTD for same temperatures.

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