Posts tagged with "Passive House":
The Greenport Passive House is an energy-efficient project in the harbor town of Greenport, New York, on the North Fork of Long Island. Architect Wayne Turett designed the residence as his own home. Drawing inspiration from the local barn vernacular, the carbon-neutral project was made to show how designers can address the climate crisis without sacrificing contemporary expectations of comfort and style.
Turett considered three key elements in the design of the Passive House: “First, the building envelope, which had to be completely sealed so that there was no leakage of air; then the insulation, to ensure that heat would not escape or cold air enter; and finally, the added elements like roof overhangs that protect the house from receiving too much sunlight in the summer,” he said. As a result of these decisions, the Greenport Passive House consumes nearly 90 percent less heating energy than existing homes and 75 percent less energy than average new construction. The home also benefits from triple-glazed windows and energy-recovery ventilation, which brings in and takes out air.
The home’s exterior is shiplap gray cedar and cement with an aluminum roof. The insulation works in combination with a proprietary sheathing taped to form the air barrier, allowing for an airtight building envelope. The all-electric home is heated and cooled with a duct mini-split system aided by an ERV. Inside, a neutral color scheme and light wood materials along with white walls and upholstery create a bright, airy aesthetic. A combined kitchen, dining, living room, and porch were intentionally programmed on the second level with views to the water. Below, bedrooms and bathrooms are accessed via an outdoor shower to smooth the transition from the site’s sandy shores. As an integrated project, the home fuses Turett’s modern aesthetic with a performative building envelope.
Architect: Turett Collaborative Location: Greenport, New York Contractor: The Turett Collaborative Plumbing: Duravit, Hansgrohe Axor Exterior siding: Fabricated by Vector East Flooring: Heart Pine with Woca White Pigment Oil Hardware: Kenwa, Ranpo, Kwikset HVAC: Mitsubishi Roofing: Atas Aluminum Standing Seam Windows: Bildau & Bussmann by Eco Supply
The Harvard Center for Green Buildings and Cities (CGBC) at the Harvard Graduate School of Design (GSD) has completed the conversion of its 1920s-built home into a live-in living lab that offers a perpetual post-occupancy evaluation. Designed by Snøhetta and energy engineers Skanska Teknikk Norway, HouseZero, as the building is now known, requires zero energy for climate control, zero energy for daytime lighting, and releases zero carbon emissions. In addition to generating more energy than it will ever use, it will also generate extensive data about its own performance.
The renovation combines low-tech changes like larger windows to let in more light, concrete slabs to store thermal energy, and a solar vent that looks like a glass chimney, with high-tech solutions such as hundreds of embedded sensors and computer- controlled actuators that automatically open and close the aforementioned larger windows to maintain the optimal internal temperature. Manual operation is also available for those times when individual comfort levels don’t fall within computer-controlled optimum, and a combination of geothermal and solar heating will ensure the house stays warm during even the coldest days of a Cambridge winter.
HouseZero’s sensors aren’t just being used to adjust internal temperature; they’re collecting millions of points of data on the building’s performance daily, which will be used to analyze the effectiveness of its energy-saving features. The valuable data collected by HouseZero will inform “further research that demystifies building behavior,” said CGBC director Ali Malkawi.
Because the building is located in the Mid-Cambridge Conservation District, the designers were limited in how they could impact the exterior of the building. This limitation ultimately benefits the project, not only by making the design more innately interesting, but also because it invites people to imagine how they could transform their own home into an energy-efficient version of itself. Like Coke Zero, which promises the same great taste with zero sugar, HouseZero promises the same great place, with zero energy. While average homeowners probably aren’t going to add hundreds of sensors and a basement supercomputer to their 1923 Sears Roebuck mail-order bungalow anytime soon, they might consider adding on some larger thermal windows and maybe even some custom-designed sunscreens if they’re feeling inspired. As the CGBC aims to prove, these changes are good for the pocketbook and the environment.
HouseZero is about challenging building conventions and finding new solutions to old problems. In time, the research collected by this smart house may help us building smarter towns and smarter cities across the country.
Today was a great example of what can be accomplished w/ a #GreenNewDeal!New building w/: ✅ Not-for-profit senior housing ✅ Universal pre-k in building (intergenerational community!) ✅ Built w/ cutting-edge “Passive House” eco methods🌱 ✅ 90% cleaner than standard buildings https://t.co/9Qpkk4rnHA — Alexandria Ocasio-Cortez (@AOC) May 29, 2019
Today at Facades+ New York, The Architect's Newspaper's conference series on innovative building envelopes, AEC professionals gathered for a day of talks on the challenges and opportunities presented by the design and construction of high-performance facades.
To kick off the afternoon session, Blake Middleton, partner at Handel Architects and Lois Arena, senior mechanical engineer at SWA convened to talk about “The House” at Cornell Tech. The 26-story, 350-unit building, on Roosevelt Island on the East River, is the largest Passive House–certified structure in the world. AN editor-in-chief William Menking was on hand to moderate the post-talk Q+A.
Passive House certification, Arena explained, is the most rigorous building standard in the world. Why? The certification is based on performance—and the performance levels that Passive House demands are five to ten times higher than current building codes require. So, to meet the exacting standards, Arena and Blake revealed just how they rose to that challenge with their project at Cornell Tech.
There are six key factors, Arena said, to achieving the certification: siting, compact shape, the proper enclosure, a low energy HVAC system, energy efficient appliances and lighting, and, crucially, user-friendliness.
The Cornell Tech building is sited due south to maximize solar gains. Middleton added that minimizing the facade’s exposed surface area was key to the certification: the designers used a “wrap” metaphor for what the facade might be, a form that's connected to the geology of the island. With a facade that’s 23 percent glass, “the design goal was to break down that scale and solidity with banding,” he said.
Functionally, the team used a prefabricated panelized wall frame for the facade, both for quality control and to achieve desired R-values of 19-40, depending on the wall’s thickness at various points.
To really double down on efficient energy use, The House has a feedback system to encourage occupant participation whereby residents can see how much energy they are using. The system, as a result, promotes friendly competition between floors to meet or beat projected energy use. Meanwhile, a centralized mechanical ventilation system helps maintain optimal airflow, but each room—per Passive House standards—comes equipped with fully operational windows to encourage natural ventilation.
Building on the success of the Cornell Tech project, the team’s next projects include a 700-unit Passive House–certified affordable housing development in East Harlem. To find out more about The House, check out another Q+A AN did with Blake earlier this week as well as more previous coverage here.