Finned Tube Calculator

Heat transfer of a tube with annular (circular) fins.

Examples

Calculation type

Temperatures

Ambient air T∞°C

°C

Geometry

Tube inner diameter Dᵢmm

Tube outer diameter D₁mm

Fin outer diameter D₂mm

Gap between fins smm

Fin thickness tmm

Tube length Lmm

Material

W/mK

Fin material

W/mK

Tube material

Air side

Air velocity vm/s

Transverse tube pitch Sₜmm

Heat transfer coefficient hW/m²K

Inner fluid

Steam pressure (gauge) patü

Fluid velocity Vm/s

Density ρkg/m³

Specific heat cₚJ/kgK

Conductivity kW/mK

Kinematic viscosity νmm²/s

Enter values at the expected mean temperature.

🔒 Calculated in your browser.

Section

Fin efficiency chart

Annular fin, η = f(ξ, r₂c/r₁).

Parameter sweep

Variable Result

Heat and resistance breakdown

Method and assumptions

Arrangement

Requirement

Air flow V̇m³/h

Air inlet T_a,in°C

Required air outlet T_a,out°C

Required power QkW

Heating fluid

Steam pressure (gauge) patü

Fluid inlet T_in°C

Fluid temperature drop ΔTK

Density ρkg/m³

Specific heat cₚJ/kgK

Conductivity kW/mK

Kinematic viscosity νmm²/s

Size limits

Face velocity vm/s

Max rows

Arrangement details

Header passes 0 = auto

Circuits 0 = auto

Number of windows

Gap between windowsmm

Window angle to airflow α°

Tube and fin

Tube inner diameter Dᵢmm

Tube outer diameter D₁mm

Fin outer diameter D₂mm

Gap between fins smm

Fin thickness tmm

Bare end (each end) amm

Fins are stripped from both ends for welding.

W/mK

Fin material

W/mK

Tube material

Transverse pitch Sₜmm

Row pitch (air direction) S_lmm

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Mechanical data

Dimensions, quantities and weight

Thermal and hydraulic data

Power, temperatures, flows and pressure drops

Power per row

Rows on the air inlet side do most of the work.

Method and assumptions

Finned Tube Calculator

Section

Fin efficiency chart

Parameter sweep

Heat and resistance breakdown

Calculation steps

Mechanical data

Thermal and hydraulic data

Power per row

Summary