A certain double plane window consists of two glass sheets each `80 cm xx 80 cm xx 0.30 cm,` separated by `0.3 cm` stagnant air space between them (see figure-4.49). The indoor surface temperature is `20^(@)C,` while the outdoor surface temperature is `0^(@)C.` Find:
(a) the temperature of the surface of the sheets in contact.with the stagnant air
(b) the power transmitted from the inside to the outside. Given that `K_(glass)=2.0xx10^(-3) cal s^(-1) cm^(-1)""^(@)C` ,
`K_(air)=2.0xx10^(-4) cal s^(-1) cm^(-1)""^(@)C^(-1)`

Answer

`[18.4^(@)C,1.67^(@)C,71.3cals^(-1)]`