to the grid. This allows the homes to be TVA Green Power Providers. A separate, three panel solar array provides domestic hot water to the home. The high performance thermal
envelope of the buildings consists of two-by-six stud walls, filled with open-cell spray foam insulation, half- inch particle board, and one-inch rigid Styrofoam board. The rigid insulation board was installed from the roofline to three feet below the first floor slab. The outside was then Typar house- wrapped, and covered in vinyl siding. “This project is the first known zero
energy duplex in the country,” said Jeff Morrow, senior project engineer for Actus Lend Lease. “It presented a lot of unique challenges to design and build a zero energy home to match our regular homes in terms of appearance and function. These homes have the same lot size and floor plan as our typical four bedroom, 2.5 bath home.” “We had to modify the roof framing
to increase the amount of rear south- facing roof for the solar panels,’ explained Morrow. “The roofing materials changed from shingle to standing seam metal panels. By mounting the solar panels to the standing seams of the metal roof, the number of roof penetrations dropped from 300 to four. From the street, it blends right in with the rest of the neighborhood. The systems on the roof, the materials behind the walls, and in the ground are what make the difference.”
A change on the front lines “These houses are the Army’s first
zero energy homes; they represent the Army’s and Actus Lend Lease’s commitment to sustainability, energy efficiency and good stewardship of our natural resources,” said Col. Perry Clark, garrison commander. “The Army can no longer be casual about energy consumption. We’re in the middle of a shift from a culture of mission-focused consumption to one that includes sustainability as a means to increase our defense capability.” The annual energy savings per
home is expected to be more than $1,000 a year. If these savings were projected for all of the 4,457-homes at Campbell Crossing, long-term benefits would include an annual savings of up to $4.6 million. Actus Lend Lease screened the
housing list at Ft. Campbell to find four families with normal, consistent energy consumption habits. Two of these families moved into the zero energy homes, and two more families moved into nearby standard homes outfitted with extensive energy monitoring equipment. To determine the true efficiency of the zero energy
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homes, the power consumption of households are being monitored and compared. In addition, a 27 percent cut in total
water consumption, and an estimated 7,300 gallons of hot water is also expected to be saved annually by each zero energy home. All the bathrooms in the home are centralized to allow for shorter piping runs, reducing the heat loss in the hot water piping. The master and upstairs bathrooms are positioned back to back, with the downstairs powder room located directly underneath.
“Actus Lend Lease is committed to
providing soldiers and their families with quality homes that are not only comfortable, but are environmentally sustainable. This innovative initiative once again demonstrates our commitment to do just that,” said Marc Sierra, Actus Lend Lease managing director. “As we monitor the success of the zero energy homes at Campbell Crossing we’ll continue to work closely with the Department of Defense to identify future opportunities for homes like these.” l
Mainstream Heating and Cooling specializes in green HVAC. From pond loops to direct exchange systems, the company tackles a variety of different projects involving geothermal equipment.
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phc july 2011
www.phcnews.com
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