How thick is a 0.5m by 0.25m piece of glass on the outside of a furnace if the h

Question

How thick is a 0.5m by 0.25m piece of glass on the outside of a furnace if the heat flux through it is 5kW/m^2? The temp inside of the furnace is 800*C and the room is at 20*C. Ignore the effect of radiation. The materials used are glass (k=0.76W/mK, C=0.840 kj/kh-k, rho = 2700kg/m^3) and air (k=0.026W/m-l, c=1.040KJ/kg-K, rho =1.23kg/mg^3) The furnace side (h=40W/m^2) and internal side (10 W/m^2-K) are bounded by air.

Please show how you did this problem, our professor sucks and cant explain his own work.

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How thick is a 0.5m by 0.25m piece of glass on the outside of a furnace if the h

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