There has already been another post this week from MIT. Ken Silverstein writes a post on the Energy Manager Today website. That gives a bit more information on it. EiD believes it is so important that it warrants this post as well.
Analyzing Buildings for Energy Efficient Retrofits Can be Practical, MIT Says
Want to know which buildings will get the biggest bang for the buck when it comes to retrofitting for energy efficiencies? Some MIT professors think they have the right tool, which will reduce greenhouse gas emissions.
Marta González and Franz-Josef Ulm are MIT professors of civil and environmental engineering, as well as Mohammad Javad Abdolhosseini Qomi PhD ’15, will report their findings to the journal Interface, published by the Royal Society in the U.K.
According to an MIT press release, the authors point out that 44 percent of all energy used in buildings in the United States goes toward heating and cooling, and this accounts for 20 percent of the nation’s carbon dioxide emissions. So, making a significant dent in that sector could help the country meet its commitments for curbing greenhouse gas emissions.
“But not all housing is created equal, and making retrofits in some of the least efficient buildings could have a much bigger impact on emissions than fixing up buildings that already perform relatively well,” says the release. “Figuring out how to identify the buildings most in need of improvement, however, at a scale useful for city officials and utility companies, is not a simple task.”
Professor González uses 82 different parameters that can have an effect on the overall thermal efficiency of a building, she says, which makes assessing the problem very difficult and especially if it is a city-wide effort. But she goes on to say that the MIT team has found that only eight such criteria are essential — and that the research will be “almost as accurate” but a lot more practical.
“My work is about reducing the number of variables you need to know,” González says. “Is there a way to do urban planning without knowing all the details?” And in this case, she and the team found, there is indeed. The factors they isolated, she says, “are the variables that matter. You can really concentrate on those eight.”
Professor Ulm adds that three factors alone can provide as much as 90 percent of the information that analysts need.
The key to making useful assessments turned out to be a direct measure of people’s energy use during cold months: their monthly gas bills, says the release. Some steps to create efficiency: adding insulation, sealing leaky windows and doors, and replacing older single-pane windows with newer double-pane versions.