Quiz 1
CHE 210 Heat and Mass Transfer
Jan 18, 2010
Prof. Radisic
Closed book and closed notes
1hr
Out of 5pt
The cross section of a storm window is shown in the sketch. How
much heat will be lost through a window measuring 1.83m by
3.66m on a cold day when the inside and outside air temperatures
are respectively 295K and 250K? Convective coefficients on the
inside and outside surfaces of the window are 20W/m2K and
15M/m2K, respectively. Thermal conductivities for glass and air
are 0.78W/mK and 0.0245WW/mK.
Draw an equivalent electric circuit for this problem.
Which is the limiting resistance?
1
2