Find the appropriate unit for σ (Stefan-Boltzman constant).

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Chapter 6, Problem 32P

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Find the appropriate unit for σ (Stefan-Boltzman constant).

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7.) The conduction heat transfer rate through a wall is modeled by the following equation: O = kAT L where O = heat transfer rate in Br Btu/ k = thermal conductivity of the wall A = area of the wall in ft L = wall thickness in ft AT = steady-state temperature difference between the inside and the outside surfaces of the wall, in F° What is the appropriate unit for k if the preceding equation is to be homogeneous in units?

! Required information Sometimes equations can be developed and practical problems solved by knowing nothing more than the dimensions of the key parameters. For example, consider the heat loss through a window in a building. Window efficiency is rated in terms of R value, which has the unit of ft2-hr-°F/Btu. A certain manufacturer offers a double-pane window with R=2.5 and also a triple-pane window with R= 3.4. Both windows are 3.5 ft by 5 ft. On a given winter day, the temperature difference between the inside and outside is 45°F. How much heat is lost through the double-pane window? Btu