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Home Technology

Is this the most energy-efficient way to build homes?

December 22, 2023
in Technology
Is this the most energy-efficient way to build homes?
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Passive houses now account for less than 1% of multifamily construction. 

It’s a marriage of efficiency and rigorously applied physics, says Bronwyn Barry, a passive-house pioneer and principal of a Bay Area architecture firm. If homes are machines for living, passive-house design principles offer a blueprint for a better machine, highlighting just how poorly constructed postwar suburban sprawl can be.

Passive design focuses on the exterior, or envelope, which needs to be tightly insulated to avoid allowing heat out or unwanted heat in. This means using thick thermal insulation and high-quality, often triple-pane windows, which let in the sun’s light and warmth but keep heat from escaping. Heat loss (and, in warm weather, gain) through standard windows necessitates 25% to 30% of residential energy use. Construction also eliminates thermal bridges, or breaks in the envelope or insulation that allow heat to drain out. Think “boxy but beautiful,” as Barry once wrote: houses boast continuous layers of insulation while minimizing the cantilevers, corners, dormers, and other features that characterize the messy rooflines of McMansions. These design requirements result in airtight buildings, as measured by a blower door test: after a specially calibrated door-mounted fan sucks air out of the house to lower the air pressure inside, technicians look for gaps and cracks where higher-­pressure air from the outside flows in. 

While this single-minded focus on efficiency, or building the best thermos, leads to exceptional performance—up to a 90% reduction in heating and cooling demand—passive houses can’t circulate air like traditional builds. But heat recovery ventilators or energy recovery ventilators can address that problem, exchanging air without sacrificing interior heat.

Often considered a cold-climate approach, passive houses actually have universal benefits. Warmer climates simply require different windows and exteriors, and additional shading to combat excessive heat gain. 

The passive-house movement has expanded well beyond single-family homes and the German and Nordic regions where it’s most popular. There are now 275-plus finished multifamily projects in the US alone, including dorms at Cornell University, scores of affordable housing projects across New York City, and the newly opened Winthrop Center, a 53-story skyscraper in downtown Boston. But even though the Passive House Network, an educational organization for the building industry, has found that costs are competitive for these large-scale projects, and incentives introduced by the Biden administration through the Inflation Reduction Act could decrease costs even more, passive houses still account for less than 1% of all multifamily construction in the US in the past decade. 

Patrick Sisson, a Chicago expat living in Los Angeles, covers technology and urbanism.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Technology Review – https://www.technologyreview.com/2023/12/22/1084532/passive-house-energy-efficient-harold-orr/

Tags: buildenergy-efficienttechnology
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