Declared coefficient arithmetic

Convection heat rate

Inputs

Declared convection coefficienthW/(m²·K)User-entered heat-transfer coefficient for the stated setup; this workspace does not derive a correlation.

Declared heat-transfer areaAUser-entered effective area; geometry and fin efficiency are excluded.

Declared temperature differenceΔTUser-entered signed bulk-to-surface temperature difference; no temperature field is derived.

Declared convection heat rateQ̇

1,575

Declared convection conductance hAhA

W/K

Q̇ = hAΔT

A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.

Calculation snapshot

Formula version 2.0.0

Declared convection coefficient	35
Declared heat-transfer area	1.8
Declared temperature difference	25

Declared convection heat rate	1,575 W
Declared convection heat rate	1.575 kW
Declared convection conductance hA	63 W/K

Q̇ = hAΔT

DOE-HDBK-1012/2-92, Thermodynamics, Heat Transfer and Fluid Flow, Vol. 2:

This printout is a record of displayed inputs and deterministic formula output. It is not an approval, certification, or engineering conclusion.

Method

Calculate heat rate from a convection coefficient, effective area, and signed temperature difference.

Q̇ = hAΔT

When

Don’t

This is user-entered convection coefficient arithmetic only. It does not derive a heat-transfer coefficient or correlation, determine flow regime, calculate a temperature field, model radiation, conduction, phase change, fins, contact resistance, material selection, service-temperature rating, equipment suitability, safety, or approval.

DOE-HDBK-1012/2-92, Thermodynamics, Heat Transfer and Fluid Flow, Vol. 2