Word: steam
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...responsibility is to bring the steam up to the wall of the building," says Hawkes...
Hawkes says buying steam has advantages and disadvantages. "Nothing is a bargain," he says. "This system allows more space in [University] buildings and better use of space without having boiler rooms in each building." Hawkes also adds that steam heating is a lower maintenance system for the University...
...same time, because the plant is not located directly on campus, the pipes lose some heat as the steam travels through the underground system. Engineers must also worry about the thermal expansion of underground pipes through junctions. "In 300 feet, [the pipes] may expand six to nine inches when they go from room temperature to steam at 400 degrees Fahrenheit," says Hawkes...
Harvard's original steam source was the Boston Elevated Railway (now the Massachusetts Bay Transportation Authority Red Line) power house, located on Memorial Drive next to Weld Boat House. When the plant was razed to build the river houses, Harvard began to buy steam from the COM/Energy Blackstone Plant down the river...
When the plant moved down the river, Harvard had to build tunnels and lines to transport the steam. Weeks Bridge, for example, was not built for the purpose of a 'nice little foot-bridge,'" says Hawkes. "It was built to get the utilities across the river...