Heat Exchanger Lmtd

Estimate heat exchanger lmtd with a transparent calculation and custom visualization.

Log mean temperature difference
40 °C
Inputs
Enter the hot in for this engineering estimate.
Enter the cold out for this engineering estimate.
Enter the hot out for this engineering estimate.
Enter the cold in for this engineering estimate.
Enter the u value for this engineering estimate.
Enter the area for this engineering estimate.
Results & Graph
Log mean temperature difference
40 °C

Log mean temperature difference

Graph 1 • Input-to-result flow Shows the calculated components and current result from this tool.
Log mean temperature differenceTerminal differe…40Terminal differe…40LMTD40Heat transfer0.0Log mean temperature difference: 40 °C
Graph 2 • Modeled quantities Compares the values returned by the active calculation.
Terminal difference 1 40 Terminal difference 2 40 LMTD 40 Heat transfer 0.0
Graph 3 • Calculation checkpoints Displays the engine’s named calculation points in order.
0C 21.6C 43.2C Terminal difference 1: 40 C 40 Terminal difference 1 Terminal difference 2: 40 C 40 Terminal difference 2 LMTD: 40 C 40 LMTD Heat transfer: 0.04 C 0.0 Heat transfer
Summary: Counterflow LMTD is 40 °C; UA × LMTD gives 0.04 kW when U is W/m²K and area is m².
Summary: Counterflow LMTD is 40 °C; UA × LMTD gives 0.04 kW when U is W/m²K and area is m².
⚠️ Ideal counterflow calculation. Excludes correction factor, fouling, phase change, pressure drop, and varying heat capacity.

Formula & Mathematical Methodology: Heat Exchanger Lmtd formula

See the calculation steps and assumptions shown with the result.
See the calculation steps and assumptions shown with the result.
  • hotIn: User-entered hot in (°C).
  • coldOut: User-entered cold out (°C).
  • hotOut: User-entered hot out (°C).
  • coldIn: User-entered cold in (°C).
  • uValue: User-entered u value (W/m²·K).
  • area: User-entered area (m²).

Rounding: Displayed result is rounded for readability.

Worked Example: undefined

Use the starting values as a screening case.

  1. Enter project-specific measurements and properties.
  2. Review assumptions and limitations.
  3. Compare the visualization with an independent engineering check.
Result: Estimates heat exchanger lmtd for the entered case.

Frequently Asked Questions

Can I use this as a final design check?

No. It is a preliminary calculation and does not replace applicable codes, manufacturer data, or qualified engineering review.

Science & Engineering • Engineering Guide

How to Use the Heat Exchanger Lmtd: Practical Guide & Visual Analysis

Use this engineering calculator for an initial screening estimate. Results are calculated locally from the values you enter. Whether you are researching heat exchanger lmtd, heat exchanger lmtd calculator, heat exchanger lmtd estimate, this interactive tool helps you calculate a preliminary heat exchanger lmtd estimate from user-entered engineering inputs.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Hot In, Cold Out, Hot Out, Cold In, the calculator immediately computes Calculated engineering estimate, Input component breakdown, Calculation profile and updates all three domain-specific SVG charts in real time. Instead of relying on a single static figure, you can inspect the primary domain diagram, component breakdown, and multi-point trajectory curve to see how changing your inputs shifts the final result. Use the Compare (up to 3 scenarios) button to evaluate side-by-side variations before making a decision.

Real-World Benchmark & Planning Tips (General engineering estimate; confirm applicable standards, units, and project conditions.)

In our benchmark scenario (undefined), Estimates heat exchanger lmtd for the entered case. Keep in mind that entered values represent the modeled system. For related calculations in Science & Engineering, explore Beam Deflection Calculator, Pump Power and Operating Cost Calculator, Three-Phase Power Calculator.