- #1

- 20

- 0

## Homework Statement

A 0.8m high and 1.5m wide double pane window consisting of two 3mm thick layers of glass(k=0.78W/mK) is separated by a 10mm wide stagnant air space(k=0.026 W/mK). The convection heat transfer coefficients on the inner and outer surfaces of the window are 10W/m^2K and 35W/m^2K respectively. For a day when the room is maintained at 25oC while the temperature outdoors is 10oC, determine:

i) the steady rate of heat transfer through this double pane window, and

ii) the temperature of its inner surface.

## Homework Equations

Q=-k*A*ΔT/ΔX

R

_{th}=ΔX/(k*A)

## The Attempt at a Solution

i)

R

_{th,glass}=0.003/(0.78*0.8*1.5)*2

R

_{th,air}=0.01/(0.026*0.8*1.5)

R

_{th,total}=2.549 W/m^2.K

What should I do after this?

And is it correct to calculate R

_{th,air}like this?

Thank you very much.