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Heat Exchanger — LMTD Design Calculator

Heat Exchanger Design — LMTD Method

Choose input method and enter temperatures. Cp may be entered as kJ/kg·K (typical) or J/kg·K.

Calculation mode

Hot mass flow ṁ_h (kg/s)

Hot inlet temperature T_hi (°C)

Hot outlet temperature T_ho (°C)

Cold mass flow ṁ_c (kg/s)

Cold inlet temperature T_ci (°C)

Cold outlet temperature T_co (°C)

Specific heat (Cp)

Typical water Cp ≈ 4.18 kJ/kg·K

Flow arrangement

Overall heat transfer coefficient U (W/m²·K)

LMTD correction factor F (use 1 for simple exchangers)