A ceiling skylight uses a \"thermal window\" of area 2.6 m 2 . The window consis

Question

A ceiling skylight uses a "thermal window" of area 2.6 m2. The window consists of thwo sheets of 2 mm thick glass, seperated by a 3.2 mm thick layer of argon gas. Take the thermal conductivity of argon to be .017 J/(s*m*deg C). The outside temerature is 31.1 celcius, and the inside temperature is 23.4 celcius. For such a horizontal gas layer, heated from above, convection can be neglected. Assume an overcast day so that radiation can also be neglected. Find the thermal energy entering the skylight per day. (J/day)

Explanation / Answer

actually the thermal conductivity of glass needs to be given. even then it can be solved as follows

the heat entering per day = k* t/x

=.017*2.6*(31.1-23.4)/3.2*10^-3

106j/day

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