NCESS TFS 110 Problem

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nirvick

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Can anyone please explain why (T ambient -T surroundings ) not (T surroundings-T ambient) ?

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*** (T ambient -T surface ) not (T surface-T ambient) ?
Well, it worked out for them because in the solution they used a negative value of the heat dissipation rate, i.e. Q=-15W.

Intuitively, you know the surface temperature will be higher than ambient so you would write Tsurface - Tambient. and with 15W (instead of -15W) you get the same answer.

 
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