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A wood box [k = 0.16 W/(m degree C) ] is kept at a constant temperature of 20 degrees C by an electric heater. The box is 0.4 x 0.4 x 0.4 m, and its walls are 2.5 cm thick. If the temperature outside the box is 4 degrees C, how much power will the heater use? 

 Feb 24, 2021
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Are the dimensions correct on k     W/m-C       or should they be    W / m2- K    ?

 

The bos has six sides    6 * .4 * .4 = .96 m^2

 

watts =    .96 m^2  *  .16 W / m2-K   * ( 293.15 - 277.15 K )        =     I do not know if this is correct......I am unfamiliar with the 'k' units in your question...

 

if the units are correct it MIGHT be

 watts =  .96 m2 / (.025m)   * .16 W /m -C  *   ( 20 - 4 C ) = ........... W

 Feb 24, 2021

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