An opaque, diffuse surface has a spectral reflectivity that varies with wavelength as shown below. The surface is held at \(850 \mathrm{~K}\) and one side is exposed to thermal radiation while the other side is insulated. The irradiation is wavelength dependent as shown in Figure P15.11.

a. What are the total absorptivity and total emissivity of the surface?

b. What is the net radiative heat flux to the surface?

Transcribed Image Text:

FIGURE P15.11 1.0 0.8 P 0.6 0.4 0.2 0 1 2 3 4 5 (um) Gr W/mum 1000 800 600 400 200 2 4 6 8 (m)