The concrete slab of a basement is 11 m long, 8 m wide, and 0.20 m thick. during the winter, temperatures are nominally 17°c and 10°c at the top and bottom surfaces, respectively. if the concrete has a thermal conductivity of 1.4 w/m · k, what is the rate of heat loss through the slab? if the basement is heated by a gas furnace operating at an efficiency of ηf = 0.9

Explanation:

As we know that base of the slab is given as

now we know that rate of heat transfer is given as

here we know that

Also we have

the answer is d

explanation:

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asthenosphere and convection