Question

How much heat (Btus) will be stored by a 25 ft x 30 ft x 4...

How much heat (Btus) will be stored by a 25 ft x 30 ft x 4 in concrete slab if it is warmed from 18°F to 62°F by exposure to sunlight? [5 pts.]

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Answer #1

Heat stored by a concrete slab can be calculated by following formula

Ht= Heat stored in (Btu/hr, Watts, J/s)

U= Overall heat transfer coefficient (Btu/hr ft2, W/m2k)

A= Area of slab (ft2, m2)

dT= Change in temperature (,K )

Here

U=0.15 Btu/hr ft2

A=25*30 = 750 ft2

dT= 62-18 = 44

Ht = 0.15*750*44= 4950 Btu/hr

Therefore,

Heat stored in slab,

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