The temperatures of the outer and inner glasses of a tripleglazed (3 glass sheets) vertical window of a building are 8°C and 22°C respectively. The spaces between the glass sheets have air at...

The temperatures of the outer and inner glasses of a tripleglazed (3 glass sheets) vertical window of a building are 8°C and 22°C respectively. The spaces between the glass sheets have air at atmospheric pressure. Assume that radiation transfer and the thermal resistances of the glass sheets are negligible. Calculate (i) the temperature of the glass sheet in the middle, and (ii) the rate of heat loss through the window. The convective heat transfer coefficient hc (Wmí2 Kí1 ) between two vertical surfaces is given by