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Radiation Exchange EGR 4345 Heat Transfer
Blackbody Radiation Exchange
Rate at which radiation leaves surface i and is intercepted by surface j For a black surface, J i = E bi Net radiative exchange
Blackbody Radiation Exchange Therefore Or Net radiation transfer from any surface in an enclosure of black surfaces
Net Radiation Exchange at a Surface in an Enclosure
Assumptions – Isothermal surfaces, T i is known – Uniform radiosity – Uniform irradiation – Opaque – Diffuse – Gray surface – Medium in enclosure is nonparticipating
Net Radiation Exchange at a Surface in an Enclosure Determine the net rate at which radiation leaves surface i Where In terms of emissive power and absorbed radiation
Net Radiation Exchange at a Surface in an Enclosure For an opaque, diffuse, gray surface Solve for G i and substitute into q i Or Driving Potential Surface Radiative Resistance
Net Radiation Exchange Between Surfaces in an Enclosure
Total rate at which radiation reaches surface i from all surfaces, including i Reciprocity Substituting in for G i
Net Radiation Exchange Between Surfaces in an Enclosure Summation rule Therefore Or Use matrix operations to solve Space or Geometric Resistance
Net Radiation Exchange in a Two-Surface Enclosure Two diffuse, gray surfaces that form an enclosure
Net Radiation Exchange in a Two-Surface Enclosure General Equation Special equations
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