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Yale’s Rustic Kroon Hall Goes Carbon Neutral
By JAMES S. RUSSELL, Bloomberg
The new Kroon Hall at Yale University strikes a rustic note with its barn-like form and thick vaulting roof, as if made of thatch.
It’s not about quaint, since it is among the few buildings in America that can claim to be almost carbon neutral — the Holy Grail in the battle against global warming. That “thatch” supports photovoltaic panels.
Kroon leads Yale’s commitment to reduce greenhouse gases to 10 percent below 1990 levels by 2020.
Since the university intends to grow, the commitment “will effectively halve our emissions,” explained Yale’s President Richard C. Levin, in a conversation during a recent visit to the campus in New Haven, Connecticut.
The School of Forestry and Environmental Studies signed on because global warming has set killer pests loose in northern hemisphere forests, while slash-and-burn tropical forestry is among the largest emitters of greenhouse gases.
The energy and climate legislation being debated in Congress intends to smite emitters by making them buy carbon permits that underwrite clean-energy efforts. Most of the permits will subsidize megaprojects like so-called clean coal.
They could support the two dozen tactics and technologies that Kroon uses, which are already proven but need to have their costs and complexities driven down.
Kroon snuggles gracefully amid stone-faced neo-Gothic neighbors. Its front-door plaza unites adjacent forestry buildings into a handsome ensemble. Planted courtyards replace loading docks and a power plant (irony intended).
Setting Sun
The building shape and its arrangement on the site look pre-ordained, but were calibrated to slice percentage points off of energy use. Hopkins Architects, of London, with the Connecticut firm Centerbrook, faced the narrowest sides of the four-story building to the east and west.
That keeps out the searing rising and setting sun. It draws in daylight on the long sides, especially the low southern winter sun, reducing the need for electric lights inside.
These energy savings are free — requiring only sensitivity to the setting and climate.
Few designers thought optimizing building orientation was worthwhile in the cheap-energy years.
The top floor, under the vaulting barnlike roof, is devoted to formal and informal gathering spaces — a “watering hole,” Hopkins’s director Michael Taylor calls it. Each is suffused with its own kind of gorgeous daylight.
Heat-rejecting louvers across an end wall of glass create the shady comfort of a front porch in the lecture room. Heavenly shafts of light bathe lounge space from skylights overhead, filtered by photovoltaic cells.
Green Economy
Kroon feels clubby yet informal thanks to wood panels that wrap ceilings and walls. Many are veneered in oak harvested using ecologically correct methods from Yale’s own forests.
(Yes, Yale owns forests — 6,000 acres in northeastern Connecticut as well as smaller holdings in New Hampshire and Vermont.)
The means to achieve carbon neutrality in buildings, which emit about 40 percent of greenhouse gases, are close at hand, explained Taylor. By Hopkins’s reckoning, the building eliminates all but 38 percent of its greenhouse-gas emissions.
(Yale bought carbon credits to achieve zero emissions on paper.)
Other building elements that will build a broad-based green economy include lighting, sensor systems, solar hot water heating and building-monitoring systems.
In Kroon, heating and cooling come from geothermal wells sunk 1,500 feet, together with a low-energy ventilation system set into the floor rather than concealed in the ceiling. The concrete ceiling is exposed, holding winter warmth and absorbing summer heat.
People in the building are drafted into the green cause.
They open windows to catch emission-free breezes when green lights throughout the building indicate conditions are right.
At $33.5 million for 58,200 square feet, Kroon is not inexpensive, but Taylor claims that the greening measures added less than 3 percent to the cost. He ticked off the ways American building techniques add costs and stifle green innovation: poorly integrated contracting practices, rigid building codes, the fear of litigation.
Levin, Yale’s president, remains committed to the university’s greenhouse-gas-reduction goals, though he has suspended almost all new construction on the campus to preserve a diminished endowment. Yale has spent $2 billion in the last five years alone.
The climate and energy legislation passed by the U.S. House of Representatives offers incentives to make more Kroons possible.
If enacted, it mandates an immediate 30 percent reduction in energy use permitted by building codes, according to Jason Hartke, director of advocacy and public policy at the U.S. Green Building Council.
Proceeds from the sale of carbon credits would provide billions in grants, loans and incentives to underwrite building efficiency, he added. “It puts green buildings at a nexus of saving energy and creating jobs.”
The next step is up to the U.S. Senate.
James S. Russell is Bloomberg’s U.S. architecture critic.
It’s not about quaint, since it is among the few buildings in America that can claim to be almost carbon neutral — the Holy Grail in the battle against global warming. That “thatch” supports photovoltaic panels.
Kroon leads Yale’s commitment to reduce greenhouse gases to 10 percent below 1990 levels by 2020.
Since the university intends to grow, the commitment “will effectively halve our emissions,” explained Yale’s President Richard C. Levin, in a conversation during a recent visit to the campus in New Haven, Connecticut.
The School of Forestry and Environmental Studies signed on because global warming has set killer pests loose in northern hemisphere forests, while slash-and-burn tropical forestry is among the largest emitters of greenhouse gases.
The energy and climate legislation being debated in Congress intends to smite emitters by making them buy carbon permits that underwrite clean-energy efforts. Most of the permits will subsidize megaprojects like so-called clean coal.
They could support the two dozen tactics and technologies that Kroon uses, which are already proven but need to have their costs and complexities driven down.
Kroon snuggles gracefully amid stone-faced neo-Gothic neighbors. Its front-door plaza unites adjacent forestry buildings into a handsome ensemble. Planted courtyards replace loading docks and a power plant (irony intended).
Setting Sun
The building shape and its arrangement on the site look pre-ordained, but were calibrated to slice percentage points off of energy use. Hopkins Architects, of London, with the Connecticut firm Centerbrook, faced the narrowest sides of the four-story building to the east and west.
That keeps out the searing rising and setting sun. It draws in daylight on the long sides, especially the low southern winter sun, reducing the need for electric lights inside.
These energy savings are free — requiring only sensitivity to the setting and climate.
Few designers thought optimizing building orientation was worthwhile in the cheap-energy years.
The top floor, under the vaulting barnlike roof, is devoted to formal and informal gathering spaces — a “watering hole,” Hopkins’s director Michael Taylor calls it. Each is suffused with its own kind of gorgeous daylight.
Heat-rejecting louvers across an end wall of glass create the shady comfort of a front porch in the lecture room. Heavenly shafts of light bathe lounge space from skylights overhead, filtered by photovoltaic cells.
Green Economy
Kroon feels clubby yet informal thanks to wood panels that wrap ceilings and walls. Many are veneered in oak harvested using ecologically correct methods from Yale’s own forests.
(Yes, Yale owns forests — 6,000 acres in northeastern Connecticut as well as smaller holdings in New Hampshire and Vermont.)
The means to achieve carbon neutrality in buildings, which emit about 40 percent of greenhouse gases, are close at hand, explained Taylor. By Hopkins’s reckoning, the building eliminates all but 38 percent of its greenhouse-gas emissions.
(Yale bought carbon credits to achieve zero emissions on paper.)
Other building elements that will build a broad-based green economy include lighting, sensor systems, solar hot water heating and building-monitoring systems.
In Kroon, heating and cooling come from geothermal wells sunk 1,500 feet, together with a low-energy ventilation system set into the floor rather than concealed in the ceiling. The concrete ceiling is exposed, holding winter warmth and absorbing summer heat.
People in the building are drafted into the green cause.
They open windows to catch emission-free breezes when green lights throughout the building indicate conditions are right.
At $33.5 million for 58,200 square feet, Kroon is not inexpensive, but Taylor claims that the greening measures added less than 3 percent to the cost. He ticked off the ways American building techniques add costs and stifle green innovation: poorly integrated contracting practices, rigid building codes, the fear of litigation.
Levin, Yale’s president, remains committed to the university’s greenhouse-gas-reduction goals, though he has suspended almost all new construction on the campus to preserve a diminished endowment. Yale has spent $2 billion in the last five years alone.
The climate and energy legislation passed by the U.S. House of Representatives offers incentives to make more Kroons possible.
If enacted, it mandates an immediate 30 percent reduction in energy use permitted by building codes, according to Jason Hartke, director of advocacy and public policy at the U.S. Green Building Council.
Proceeds from the sale of carbon credits would provide billions in grants, loans and incentives to underwrite building efficiency, he added. “It puts green buildings at a nexus of saving energy and creating jobs.”
The next step is up to the U.S. Senate.
James S. Russell is Bloomberg’s U.S. architecture critic.
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