Homework_07(1).pdf - MAE 336 Heat Transfer Spring 2018...

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MAE 336: Heat Transfer - Spring 2018 Homework #7: (optional) Due Tuesday 5/08/18 at 11:59pm Please follow the solution steps outlined in the syllabus. Each question worth upwards of 10 points added to your semester total homework score. 1. A large opaque plate sits at a temperature T s = 220 C and is insulated on the bottom side. The top of the plate emits E ” = 1200 W m 2 and is exposed to air T = 100 C with a convective heat transfer coefficient h = 12 W m 2 · K . Incident to the plate is irradiation G ” = 2400 W m 2 , of which 600 W m 2 is reflected. (a) Determine the emissivity, absorptivity, and radiosity of the plate. (b) Determine the net heat flux. 2. Figure 1 shows a rectangular cavity ( W = 25 mm and L = 125 mm ) on a satellite in space. Surface 2 can be assumed to be a blackbody at absolute zero while surface 1 is at T 1 = 325 C with an emissivity = 0 . 7. Determine the rate of heat transfer (per unit depth) due to radiation from the cavity to space. 3. Steel rods of thermal conductivity k = 50
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