Estimate the rate of convective heat transfer across a 1 m tall double-pane window assembly in which

Question:

Estimate the rate of convective heat transfer across a 1 m tall double-pane window assembly in which the outside pane is at 0°C and the inside pane is at 20°C. The panes are spaced 2.5 cm apart. What is the thermal resistance (‘R’ value) of the window if the rate of radiative heat flux is 84 W/m2?
GIVEN
Double-pane window assembly
Height (H) = 1 m
Spacing (δ) = 2.5 cm = 0.025 m
Pane temperatures
Inside (T) = 20°C
Outside (To) = 0°C
Radiative heat flux (qr/A) = 84 W/m2
ASSUMPTIONS
Steady state
Conduction through the window frame is negligible