Two small surfaces, A and B, are placed inside an isothermal enclosure at a uniform temperature. The

Question:

Two small surfaces, A and B, are placed inside an isothermal enclosure at a uniform temperature. The enclosure provides an irradiation of 6300 W/m2 to each of the surfaces, and surfaces A and B absorb incident radiation at rates of 5600 and 630 W/m2, respectively. Consider conditions after a long time has elapsed.

(a) What are the net heat fluxes for each surface? What are their temperatures?

(b) Determine the absorptivity of each surface.

(d) Determine the emissivity of each surface.