Heat Exchanger LMTD Calculator

Calculate Log Mean Temperature Difference: LMTD = (ΔT₁ - ΔT₂)/ln(ΔT₁/ΔT₂). Heat duty Q = U·A·F·LMTD. Correction factor F for multipass and cross-flow arrangements from standard charts.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How It Works

Calculate Log Mean Temperature Difference: LMTD = (ΔT₁ - ΔT₂)/ln(ΔT₁/ΔT₂). Heat duty Q = U·A·F·LMTD. Correction factor F for multipass and cross-flow arrangements from standard charts

Each component has a specific meaning:

  • Standard charts — The standard charts recorded for the patient or scenario being assessed.

Note: Interpret the lmtd result against the clinical thresholds and context described above.

How to Use

Enter the standard charts for the patient or scenario you are assessing. Calculate Log Mean Temperature Difference: LMTD = (ΔT₁ - ΔT₂)/ln(ΔT₁/ΔT₂). Heat duty Q = U·A·F·LMTD. Correction factor F for multipass and cross-flow arrangements from standard charts. Use the lmtd result to inform your clinical assessment.

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Frequently Asked Questions