Two glass plates, radiation and heat transfer?

[Stickybees]

Hey, how would I start solving the total radiation transmitted through one plate, an air gap then another plate (double glazing) as well as the total convective heat transfer across the two plates?

Thanks!

 

[Stickybees]

Also, how would I find heat loss due to forced convection? I know that Nu=f(Re, Pr), but I don't know how I would find the function that relates them? :S