Heat Exchanger LMTD Calculator
Static · formula-only · worked example computed when this page was built · no live data
The Heat Exchanger Calculator finds the corrected LMTD, effectiveness, and NTU for a shell-and-tube exchanger duty. Example: for a 500 kW counterflow duty cooling water 90→60 °C against 30→50 °C water, at 3.99 kg/s hot and 5.98 kg/s cold flow, Corrected LMTD = 31.63 K, Effectiveness = 0.5, Correction factor F = 0.91 (per TEMA 10th Ed. | ASME Sec. VIII Div.1 | Kern Process Heat Transfer | VDI Heat Atlas).
How it works
Computed from your inputs per TEMA 10th Ed. | ASME Sec. VIII Div.1 | Kern Process Heat Transfer | VDI Heat Atlas. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Mechanical & Machine Design)
Inputs: a 500 kW counterflow duty cooling water 90→60 °C against 30→50 °C water, at 3.99 kg/s hot and 5.98 kg/s cold flow.
| Result | Value |
|---|---|
| Corrected LMTD | 31.63 K |
| Effectiveness | 0.5 |
| Correction factor F | 0.91 |
Computed by WorkHive's calculation engine when this page was built; standard: TEMA 10th Ed. | ASME Sec. VIII Div.1 | Kern Process Heat Transfer | VDI Heat Atlas.
How to use this calculator
- Read the worked example. It uses a 500 kW counterflow duty cooling water 90→60 °C against 30→50 °C water, at 3.99 kg/s hot and 5.98 kg/s cold flow and shows every number in the method.
- Follow the formula with your own figures: it returns Corrected LMTD, Effectiveness, Correction factor F, computed per TEMA 10th Ed. | ASME BPVC Sec.VIII.
- To compute interactively, open the Heat Exchanger LMTD Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a heat exchanger LMTD calculator?
The Heat Exchanger LMTD Calculator is a free online tool that finds the corrected LMTD, effectiveness, and NTU for a shell-and-tube exchanger duty. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following TEMA 10th Ed. | ASME BPVC Sec.VIII. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Heat Exchanger LMTD Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.