Tuesday, July 29, 2008

Revolving doors and energy efficiency

How big a difference can using a revolving door make? In 2006, a team of graduate students at MIT conducted an analysis of door use in one building on campus, E25, where they found just 23 percent of visitors used the revolving doors. According to their calculations, the swinging door allowed as much as eight times more air to pass through the building than the revolving door. Applying average Boston weather to their equations, the MIT team found that if everyone used the revolving doors, it would save more than 75,000 kilowatt-hours of energy—about 74 percent of the total required to heat and cool the building—and prevent 14.6 tons of carbon dioxide from being emitted. (By way of comparison, the EPA says an average American vehicle emits about six tons of carbon dioxide over a year.)
--Jacob Leibenluft, Slate, on why you should use revolving doors

1 comment:

Jess Austin said...

Hmm, I think they need to check their numbers again. These results seem to imply extraordinary levels of insulation. Does this building not have windows? (although at MIT I guess I wouldn't be surprised) There seems to be a units error here too; why isn't ongoing energy loss just stated in terms of kilowatts?