Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

First Difference Kelvin (K)

Required number input.

Second Difference Kelvin (K)

Required number input.

Log-mean of positive terminal temperature differences for a heat exchanger; equal terminal differences return that same difference. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Lmtd Kelvin (K)

The resulting lmtd kelvin returned as a number.

• Heat-transfer estimates depend on geometry, contact resistances, radiation, convection regime, temperature-dependent properties, fouling, phase change, and boundary conditions. Tabulated coefficients and COP values are operating-condition specific.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Heat Conduction Fourier

  Steady one-dimensional conductive heat-transfer rate through a plane layer from conductivity, area, thickness and temperature difference.

• Heat Energy Specific Heat

  Sensible heat required for a mass with constant specific heat capacity over the chosen temperature interval.

• Heat Exchanger LMTD Method

  Steady heat-exchanger duty Q=U A ΔTlm for a supplied overall coefficient, reference area and already-corrected LMTD.