Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below.
GIVEN
- A single-pane and a double-pane window assembly
FIND
(a) The modes of heat transfer for each
(b) Compare the modes of heat transfer for each
ASSUMPTIONS
- The window assembly wood casing is a good insulator
SKETCH
The thermal network for both cases is shown above and summarizes the situation. For the single-pane
window, we have convection on both exterior surfaces of the glass, radiation from both exterior
surfaces of the glass, and conduction through the glass. For the double-pane window, we would have
these modes in addition to radiation and convection exchange between the facing surfaces of the glass
panes. Since the overall thermal network for the double-pane assembly replaces the pane-conduction
with two-pane conductions plus the convection/radiation between the two panes, the overall thermal
resistance of the double-pane assembly should be larger. Therefore, we would expect lower heat loss
through the double-pane window.
You might also like to view...
A single slit, which is 0.0500 mm wide, is illuminated by light of 550. nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
What will be an ideal response?
What is differential rotation, and what surprises did it have for us with Uranus?
What will be an ideal response?
Electrical force per unit charge is known as the ________
Fill in the blank(s) with the appropriate word(s).
The number of daylight hours before 12 noon is approximately the ______________ as the number after 12 noon
Fill in the blank(s) with correct word