Unformatted text preview: constant at the specified values. 2 Thermal properties of the glass are constant. Properties The thermal conductivity of the glass is given to be k = 0.78 W/m ⋅° C. Analysis Under steady conditions, the rate of heat transfer through the glass by conduction is W 4368 m 0.005 C 3) (10 ) m 2 C)(2 W/m (0.78 2 = ° − × ° ⋅ = Δ = L T kA Q cond & Glass 3 ° C 10 ° C 0.5 cm Then the amount of heat transfer over a period of 5 h becomes kJ 78,620 = × = Δ = s) 3600 kJ/s)(5 (4.368 t Q Q cond & If the thickness of the glass doubled to 1 cm, then the amount of heat transfer will go down by half to 39,310 kJ . 125...
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Conductivity, Mass, Heat

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