Calculator
Heat Exchanger Sizing Calculator
Estimate the required heat transfer area using the LMTD method for counterflow shell-and-tube and plate heat exchangers.
Interactive toolUpdated July 2026
Inputs
Water-water 800–1500, steam-water 1500–3000, air-water 30–80.
Results
Required Area
8.99 m²
LMTD 69.52°C · ΔT₁ 80.00 · ΔT₂ 60.00
How It Works
A = Q / (U · LMTD), LMTD = (ΔT₁ − ΔT₂) / ln(ΔT₁/ΔT₂)
Counterflow: ΔT₁ = T_hot,in − T_cold,out; ΔT₂ = T_hot,out − T_cold,in. For parallel flow use ΔT₁ = T_hot,in − T_cold,in. Apply a correction factor F for non-counterflow arrangements.