Clyde Bldg WindowsEldon Loose & Robert Brown
Energy Crisis
1973 Oil “shortage”
1973 Clyde Building completed
Clyde Bldg Windows48 on South Side
0 on North and West Sides
17 on East side
(excludes stairwells, doors and the
lounge area)
Heat Loss
Single Pane
Rtot = 0.246 m^2 °C/W
U = 4.07 W/m^2 ° C
q”= U(Ti-To)
q” = 165 W/m^2
Double Pane, Low E
Rtot = 0.669 m^2 °C/W
U = 1.5 W/m^2 ° C
q”= U(Ti-To)
q” = 60 W/m^2
The average temperature in January is To = 0 °F = -17.8 °CTi = 73 °F = 22.7 °C
Energy Saved
• By limiting number of windows. (estimate number of windows would have been 4x45 or 180)
25% of loss with 180 windows
• By using double pane Low-E windows
Heat loss is reduced by 63% 178 windows could be used
Window area with equal heat loss
Surface area of single pane windows
As = 54 m^2
q= 8.97 kW
With double pane Low-E windows
at q= 8.97 kW
Ad = 149 m^2
275% increase in window area
Conclusion
Double paned windows are much more efficient.
Had the CB been built with double paned low-E windows, there could have been 275% more window area without additional heat loss.
Sources
• irc.nrc-cnrc.gc.ca/pubs/cbd/cbd052_e.html
• http://www.sei.ie/uploadedfiles/InfoCentre/whatisauvalue.pdf