Lab · Thermal Engineering

Heat Transfer Lab

One ordered, steady 1D thermal system: solid layers and optional fluid boundaries, with a shared heat rate and solved interface temperatures.

Thermal system

Wall area A[m²]

Boundary 1 temperature[K]

Boundary 2 temperature[K]

Boundary 1 convection

Boundary 2 convection

Solid 1

Material label

Conductivity k[W/(m·K)]

Thickness L[m]

Boundary order is geometric, not a forced hot-to-cold ordering. Positive Q̇ flows 1 → 2; negative Q̇ flows 2 → 1. Temperatures are in kelvin.

Heat-transfer rate Q̇

4 kW

Rtotal = 0.025 K/W · Boundary 1 → boundary 2 · q″ = 400 W/m²

Boundary 1
400 KQ̇ →Boundary 2
300 K

Schematic not to scale. Layer order runs from boundary 1 to boundary 2.

0 · Surface 1 · x = 0 m	400 K
1 · Surface 2 · x = 0.2 m	300 K

· Steady 1D series path; constant conductivity in each layer.
· Perfect solid interfaces; no contact resistance or heat generation.
· Prescribed uniform convection coefficients; no correlation is inferred.
· Positive heat rate flows from boundary 1 toward boundary 2; a negative rate reverses the flow.