Commercial Architecture April 2019 - 42

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PROJECT

| hvac

Individual Temperature Control Cuts Utility Costs
Independent room controls prevent energy waste from overheating or overcooling.

n recent years, average rent for a one-bedroom apartment in Brooklyn's Bushwick neighborhood has skyrocketed to more than $3,000
a month, excluding utilities. That's why New York City's Depart-

ment of Housing Preservation and Development (HPD) and Ridgewood Bushwick Senior Citizens Council (RBSCC) came together to
develop Knickerbocker Commons.
RBSCC also wanted to radically cut tenant utility costs without
compromising comfort. So, they enlisted Chris Benedict, R.A., New
York, to design an ultra-low-energy building. Henry Gifford, who
works for Chris Benedict, designed the mechanical systems for the
building. The team combined several technologies, such as continuous exterior insulation, energy-recovery ventilators, sealed-combustion boilers, and individual room-thermostat controls, including Baltimore-based Danfoss', thermostatic radiator valves (TRVs). According
to Gifford, the result is 90% lower energy consumption than comparable buildings-and heating costs below $50/apartment/year.
"The 803 Knickerbocker Avenue building was completed in 2014,"
said Gifford. "We used proven building-science concepts that could
be applied to any high-performance building. No energy-efficiency
rebates defrayed the cost of the low-energy technology we used. In
fact, we delivered an extreme level of efficiency and comfort without
adding to the construction cost."
Known for his life-long passion for building science, Henry Gif-

ford attended the first class in the U.S. on ultra-low-energy building
principles known as "Passive House." According to Gifford, who
recently published the book, Buildings Don't Lie: Better Buildings by

Understanding Basic Building Science, "If you understand the underlying science, you'll have the tools to improve buildings from the
start."
The Passive House principles use a continuous air barrier and exterior insulation. These construction techniques eliminate thermal
bridging, creating an interior space that can maintain a comfortable
temperature. Natural light and human activities keep the space generally warm. Mechanical systems handle domestic hot-water production
and extreme hot and cold conditions.
When energy prices in Europe more than quintupled in the early
2000s, the "Passivhaus" idea took off-with more than 25,000 buildings on the continent meeting the voluntary, ultra-low-energy building standard by 2010.
In the United States, energy-cost hikes were not that extreme, but
rising. In 2011, Gifford and Benedict were presented with two projects
ideal for the unique design approach, one of which was Knickerbocker Commons.

Proven building-science concepts were used in the Knickerbocker Commons building to
deliver an extreme level of efficiency and comfort without adding to the construction cost.

APRIL 2019

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Commercial Architecture April 2019

Table of Contents for the Digital Edition of Commercial Architecture April 2019