A building has a triple-glazed vertical window with a 13 mm air space between adjacent glasses. The glass thickness is 6 mm and the thermal conductivity is 0.8 Wmí1 Kí1 . The emissivity of glass is...

A building has a triple-glazed vertical window with a 13 mm air space between adjacent glasses. The glass thickness is 6 mm and the thermal conductivity is 0.8 Wmí1 Kí1 . The emissivity of glass is 0.9. The inside and outside heat transfer coefficients are 9 Wmí2 Kí1 , and 29 Wmí2 Kí1 respectively. The indoor and outdoor air temperatures are 22°C and í12°C respectively. (a) Calculate the rate of heat loss through center of the window. (b) What is the minimum indoor relative humidity at which condensation will occur on the inner surface of the window? Will the answer be different if the edge of the glass is considered?