The spectral absorptivity of a largediffuse surface is0.9

Chapter 13, Problem 13.103

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The spectral absorptivity of a largediffuse surface is??0.9 for ?1m and ??0.3 for 1m.The bottom of the surface is well insulated, while thetop may be exposed to one of two different conditions.(a) In case (a) the surface is exposed to the sun, whichprovides an irradiation of GS?1200 W/m2, andto an airflow for which T??300 K. If the surfacetemperature is Ts?320 K, what is the convectioncoefficient associated with the airflow?(b) In case (b) the surface is shielded from the sunby a large plate and an airflow is maintainedbetween the plate and the surface. The plate isdiffuse and gray with an emissivity of ?p?0.8.If T??300 K and the convection coefficient isequivalent to the result obtained in part (a), whatis the plate temperature Tpthat is needed tomaintain the surface at Ts?320 K?

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