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