Lecture 14-15 PRS.pdf - PRS L14: How could you decrease the...

PRS L14: How could you decrease the heat loss through a
window on a cold day?
1) Increase the thickness of the glass
2) Use a glass with a smaller thermal conductivity
3) Use double-glazed window
4) Decrease the temperature inside your house
5) Do all of the above
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Answer: 5) Do all of the above
C onduction loss = A U Δ
Explanation
A is the area of the window;
 T is the difference between indoor and outdoor temp;
U value is the thermo-conductance of the window, which is also inversely
proportional to its thickness
T
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