Question: 3) (4 marks) A double-glazed window for a roof-light is 1.5m by 1.2m and consists of two layers of glass 5mm thick of thermal conductivity

3) (4 marks) A double-glazed window for a roof-light is 1.5m by 1.2m and consists of two layers of glass 5mm thick of thermal conductivity 0.78 W/m.K separated by a 20mm thick space filled with Ar- gon gas of thermal conductivity 0.016 W/m.K. Determine the steady rate of heat transfer through this window (W) when the inside air temperature is 18C and the outside temperature is 0C. The convection heat transfer coefficients of the inner and outer surfaces of the window are hi =10 W/ m2K and ho=40 W/m2K, respectively. What is the room side surface temperature of the window

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