A deep cavity of 50-mm diameter approximates ablackbody
Chapter 12, Problem 12.109(choose chapter or problem)
A deep cavity of 50-mm diameter approximates ablackbody and is maintained at 250C while exposedto solar irradiation of 800 W/m2and surroundings andambient air at 25C. A thin window of spectral trans-missivity and reflectivity 0.9 and 0, respectively, forthe spectral range 0.2 to 4?m is placed over the cavityopening. In the spectral range beyond 4?m, the win-dow behaves as an opaque, diffuse, gray body of emis-sivity 0.95. Assuming that the convection coefficienton the upper surface of the window is 10 W/m2?K, determine the temperature of the window and thepower required to maintain the cavity at 250C.
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