Calculator · Thermal Engineering

Convection Heat Transfer

Prescribed-h Newton cooling: thermal resistance, signed surface-to-fluid heat rate and heat flux.

Inputs

Surface temperature Tₛ[K]

Fluid temperature T∞[K]

Prescribed h[W/(m²·K)]

Area A[m²]

Results

Heat-transfer rate Q̇

2.5 kW

Surface/base → fluid

Equivalent thermal resistance	0.02 K/W
Heat flux q″	1250 W/m²

Assumptions

· Prescribed uniform h. Positive heat rate leaves the surface toward the fluid.

Explore in the Lab

Open in Heat Transfer Lab

Transfers h, area and fluid temperature to boundary 1. The Lab includes an editable solid wall; its total heat rate is a new system result, not the isolated surface result.

Technical reference

R = 1/(hA)

Q̇ = hA(Tₛ − T∞)

q″ = Q̇/A

R: thermal resistance[K/W]
Q̇: signed heat-transfer rate[W]
k: thermal conductivity[W/(m·K)]
h: prescribed convection coefficient[W/(m²·K)]

Steady heat transfer with constant material properties. No radiation, transient storage or inferred convection correlations.