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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) |
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