Commercial Architecture February 2018 - 45
baseboard heating and variable-air-volume system with electric reheat contributed to
er to the windows, increasing the usable floor space of the building."
large utility bills. Seeking to improve the building's energy efficiency, Northside
Comparing the window bays before and after the retrofit, thermal imaging shows
management worked with the Globelé Energy team to review the property according
window surface-temperature differences of nearly 20 F. Sheppy described, "The new
to the U.S. Department of Energy's (Washington, energy.gov) benchmarking pro-
windows stand out in sharp contrast against the old windows. This indicates that the
gram and by performing a Level 1 ASHRAE energy audit.
new windows are keeping out the cold 34 F outside conditions, while keeping in the
As a regional electric-distribution company, UI provides energy-efficiency pro-
warm 72 F inside conditions."
grams through the EnergizeCT initiative. The initiative is designed to advance the
As the lead auditor for the building, Globelé Energy's Alfred Peterson pointed out
efficient use of energy, reduce air pollution and negative environmental impact, and
that the project's "success is measured by sustainable reduction in energy for a single
promote economic development and energy security.
Energy Opportunity or as a Comprehensive Initiative of two or more projects as was
"UI's energy engineer, Gary Pattavina, was instrumental in guiding us through the
bundled for 195 Church."
plan and offered very helpful advice and guidance through a very intricate process,"
Based on this measure of analysis, the new S.E.A.L. units, in combination with
said Vigilante. "The goal was to make this building as efficient as possible, thus doing
the new LEDs, are anticipated to save 29% in annual electrical consumption. Esti-
the right thing for the environment and also producing a very good return on our
mates show a yearly electrical energy savings of $0.95/sq. ft., reducing the owner's
roughly $805,000 annual electric bill by $203,000. CA
Pattavina noted, "Electrically heated buildings are a great candidate for energyefficiency measures and these types of projects are exactly what we look for at UI. We
recognize new energy-efficient windows are a costly investment and the incentives
available to our customers help bring that up-front cost down significantly. We were
very excited to work with the customer and their design team to help them achieve
the energy savings on this window-replacement project."
Want more information? To download the information listed below,
MODELED FOR SAVINGS
To achieve the owner's energy-reduction goals, Globelé facilitators outlined a multiphased plan. Phase I recommended replacing the old fluorescent lights with new
LEDs and updating the 43-yr.-old windows. Helping Northside's team select the op-
Circle 2 on the
Reader Service Card.
Get information on an energy-modeling
and green-product selection tool.
Download a white paper on
Download a brochure on interior
timal window system, the Apogee team provided an annual energy-saving forecast
showing the potential savings offered with Wausau, WI-based Wausau Window and
Wall Systems' (wausauwindow.com) 1297 series S.E.A.L. interior accessory windows.
Interior accessory windows are installed from the building's interior over the existing windows, which were sealed closed to prevent air infiltration. For 195 Church,
the S.E.A.L. units feature Viracon's (Owatonna, MN, viracon.com) RoomSide low-e
A ROOFTOP VIEW
glass and aluminum framing members finished by Linetec (Wausau, WI, linetec.
com) in Dark Bronze anodize.
Using the eQUEST energy-modeling physics-based software tool to simulate the
performance of a building on an annual basis, the Apogee team forecasted the level
of energy savings that could be achieved by adding an interior accessory window with
low-e glass to the existing glazing. From this data, performance predictions were
provided on annual energy, peak demand, and daylight energy use.
"Today's energy-efficient windows can dramatically lower the heating and cooling
costs associated with windows, while increasing occupant comfort," said Apogee
Building Retrofit Strategy Team's certified energy manager, Mike Sheppy. "Optimizing natural light also can contribute to a building's energy efficiency and tenants'
DAYLIGHTING AND COMFORT
The RoomSide low-e glass also improved the light-to-solar gain (LSG) ratio by 21%.
Sheppy explained, "This improved LSG ratio increases the number of hours in the
year that natural daylighting can be used without tenants having to draw their blinds.
Electrical lighting can be dimmed or turned off with daylighting controls."
He continued, "Furthermore, according to the World Green Building Council,
natural daylighting can save up to $2,000 per employee in office costs by increasing
occupant comfort, leading to higher productivity. Adding an interior accessory winFi
In Connecticut's cold months, Sheppy said, "The new glazing will keep the occu-
For more information
because surface temperatures are much closer to room temperature."
dow with low-e glass to the existing glazing significantly improves occupant comfort
pants seated in the perimeter spaces of this building more comfortable by significantly reduced radiant-heat transfer. These improvements will allow occupants to sit closCIRCLE 216