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The diameter and surface emissivity of an electrically heated plate are D = 300 mm and s = 0.80, respectively.
(a) Estimate the power needed to maintain a surface temperature of 200°C in a room for which the air and the walls are at 25°C. The coefficient character- izing heat transfer by natural convection depends on the surface temperature and, in units of W/m2 · K, may be approximated by an expression of the form h = 0.80(Ts - T00)1/3.
(b) Assess the effect of surface temperature on the power requirement, as well as on the relative contributions of convection and radiation to heat transfer from the surface.
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an ocean thermal energy conversion otec system is proposed to generate 10 mw of electricity. the proposed location of
A room has 1000 ft2 of surface, of which 120 ft2 is to be heated, and the balance has an average surface temperature of 60°F. The air temperature in the room is 68°F. The room is occupied by light clothed adults at rest. Determine the surface tempera..
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