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.
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