Heat Exchanger Duty Calculator

Calculate heat exchanger duty using the Log Mean Temperature Difference (LMTD) method: Q = U × A × ΔTlm for counter-current or parallel flow.

Hot fluid inlet temperature (°C)

Hot fluid outlet temperature (°C)

Cold fluid inlet temperature (°C)

Cold fluid outlet temperature (°C)

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

Heat transfer area (m²)

Flow arrangement (0 = counter, 1 = parallel)

Tab to move between fields

LMTD (°C)

72.24

Heat duty (kW)

361.2

Heat duty (BTU/hr)1,232,476

ΔT₁ (°C)80

ΔT₂ (°C)65

Heat duty (W)361,203

Effectiveness NTU1

How to Use This Calculator

Enter Hot fluid inlet temperature (°C), Hot fluid outlet temperature (°C), and Cold fluid inlet temperature (°C).
Set Cold fluid outlet temperature (°C), Overall heat transfer coefficient U (W/m²·K), and Heat transfer area (m²).
Adjust Flow arrangement (0 = counter, 1 = parallel) as needed.
Review LMTD (°C) and Heat duty (kW).
Use Heat duty (BTU/hr) and ΔT₁ (°C) to inform your decision.

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