The spectral absorptivity ?? and spectral reflectivity p? for a spectrally selective, diffuse material are as shown.

(a) Sketch the spectral transmissivity ??.

(b) If solar irradiation with GS = 750 W/m2 and the spectral distribution of a blackbody at 5800 K is incident on this material, determine the fractions of the irradiation that are transmitted, reflected, and absorbed by the material.

(c) If the temperature of this material is 350 K, determine the emissivity ?.

(d) Determine the net heat flux by radiation to the material.

Transcribed Image Text:

1.0 1.0 P=0.1 1.38 1.38 λμη) λμm) ν Υn