P.7 12 The interior contents and materials of a small building weigh 25 tons, an
ID: 1857395 • Letter: P
Question
P.7 12The interior contents and materials of a small building weigh 25 tons, and together they have an average specific heat of 0.25 Btu/(lbm . F). Neglecting any inefficiency in the furnace, what amount of natural gas must be burned to raise the building's temperature from freezing to 70 F?
P.7 12
The interior contents and materials of a small building weigh 25 tons, and together they have an average specific heat of 0.25 Btu/(lbm . F). Neglecting any inefficiency in the furnace, what amount of natural gas must be burned to raise the building's temperature from freezing to 70 F?
Explanation / Answer
average specific heat of 0.25 *4.136
=1.03 KJ /Kg K
mass 25 toons
25*907 kg
22,675 kg
so q=1.03*22,675* 21 KJ
=23,446 *21
= 492,366 KJ
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