Calculator · Thermal Engineering
Radiation Exchange
Gray diffuse surface radiation to large isothermal surroundings, with signed net heat flow and radiative coefficient.
Inputs
Results
Net radiative heat rate
4.9355 kW
Surface → surroundings
| Signed heat flux | 2467.7 W/m² |
|---|---|
| Radiative coefficient hr | 12.339 W/(m²·K) |
Assumptions
- · Gray diffuse small body in large isothermal surroundings. Positive heat rate leaves the surface.
- · No arbitrary view factors or surface network.
Technical reference
Q̇ = εσA(Ts⁴ − Tsur⁴)
hr = εσ(Ts + Tsur)(Ts² + Tsur²)
Radiative emissivity ε is distinct from exchanger effectiveness εHX.
Temperatures are absolute K; frozen engine requires T > 0 K.