Heat exchanger calculators
Rapid first-pass figures for LMTD and heat duty. Add them to your enquiry and our team will handle the rest.
Two calculators for a first estimate
Work out the heat load and the log mean temperature difference in seconds, then attach the numbers to your enquiry. Our design team checks and refines every figure before quoting.
- Duty shown in kW, MW, TR, kcal/h and BTU/h
- LMTD for counter-flow, with the closest approach
- Figures ready to copy into your RFQ
These are first estimates. The final thermal design is always confirmed by our engineers.
How the calculators work
Heat duty
Q = ṁ · Cp · ΔTMultiply mass flow (kg/s) by specific heat (kJ/kg·K) and the temperature change (K) to obtain duty in kW.
Log mean temperature difference
LMTD = (ΔT₁ − ΔT₂) / ln(ΔT₁/ΔT₂)In counter-current flow, this is the effective driving temperature difference for heat transfer.
Required area
A = Q / (U · F · LMTD)F corrects for multi-pass arrangements, while U stands for the overall heat transfer coefficient.
Useful conversions
| Unit | Equals |
|---|---|
| 1 TR | 3.517 kW |
| 1 kW | 859.8 kcal/h |
| 1 kW | 3,412 BTU/h |
| 1 MW | 284.3 TR |
| 1 bar | 14.504 psi |
| °F | °C × 1.8 + 32 |
Have a shutdown date or project deadline?
Give us the date your equipment must be on site. We will plan design, fabrication, inspection and shipping backwards from it and tell you honestly if it is achievable.