Saving With Energy Star
November 12, 2007
ATLANTA - The Energy Star program provides value not only in
helping improve the efficiency of buildings, but in also seeing at what level a
building is relative to its peers. In the session labeled “Leveraging Energy
Star Tools and Resources to Improve Energy Performance” at the World Energy
Engineering Congress (WEEC), attendees received an overview of the program and
how to implement benchmarking to set the bar for improvement.
Ann Elsen, C.E.M., energy consultant, ICF International,
started the session by providing an Energy Star update, noting “There’s a lot
more sense of urgency in energy efficiency.”
Energy represents 30 percent of a building’s operating
costs, said Elsen. Pursuing the Energy Star label can save on those energy
costs. She noted that the Energy Star label has been awarded to 3,200 buildings
and “saves $600 million annually in lower energy bills.”
Elsen said that you can use an Energy Star rating to:
• Establish a building performance baseline;
• Identify opportunities for improvement;
• Check performance over time;
• Prioritize investment opportunities; and
• Get recognition if you achieve the Energy Star label.
The Energy Star program provides useful financial tools, she
related, including: a financial value calculator that helps convert energy data
into information usable for budgeting decisions; a cash flow opportunity
calculator that answers questions about efficiency investments; and a building
upgrade value calculator that provides return on investment.
A building upgrade manual is available that provides a
third-party resource to validate upgrade decisions. Elsen said that users can
easily achieve 10-20 percent energy savings with an 18-month payback.
RETROCOMMISSIONINGBarry Abramson, P.E., senior vice president, Servidyne
Systems Inc., discussed opportunities through retrocommissioning.
A study of energy intensity in Energy Star buildings found
that “there is about a 35 percent difference compared to standard buildings,”
said Abramson. Building owners have achieved the Energy Star label through
retrofit programs. But some have retrofitted and still haven’t qualified, he
Age of equipment is not a significant predictor of how much
energy a building uses, stated Abramson. And although 80-plus percent of Energy
Star buildings have energy management systems, a lot of the worst performing
buildings also use them.
Retrocommissioning is applied to existing buildings to
enable a facility to meet the owner’s current and anticipated future
requirements, he said. There are three laws of retrocommissioning.
The first law, as Einstein said, is “Everything should be
made as simple as possible - but not simpler.”
The second law, as Gilbert and Sullivan noted, is “Things
are seldom what they seem.” The third law, paraphrasing movie character
Napoleon Dynamite, is “It may not be low-hanging fruit, but it’s still flippin’
There are problems that you can find in retrocommissioning.
These include such things as the need to adjust outside air, mitigate
simultaneous heating and cooling, reduce flow from oversized pumps, and reset
supply air temperatures.
Is retrocommissioning more suitable for older buildings?
According to Abramson, it is “pretty much suitable for every building.” Even
newer buildings can have problems.
TRACKING IMPROVEMENTSGreg Coleman, vice president of energy services, TRC Energy
Services, then talked about tracking energy performance improvements.
Where do you start to improve energy performance?
Intuitively, Coleman said, people think they should start with the oldest
buildings, the biggest buildings, buildings with the longest operating hours,
or buildings in the harshest climate. However, there are no correlations based
on any of these parameters, he stated. “You can’t be just intuitive.”
Coleman noted, “To quote Deming, ‘You can’t manage what you
don’t measure.’” Energy Star benchmarking enables you to enter your building into
the Portfolio Manager and see how it compares on a scale to other buildings of
Coleman then explained how New York State’s K-12 schools
program made use of the Portfolio Manager to measure and track its energy
performance. The schools were able to achieve a 13 percent decrease in overall
energy consumption; a 19 percent decrease in heating fuel consumption; and no
increase in electricity consumption despite a 100 percent increase in air
STRATEGIES FOR SCHOOLSDouglas Karnuth, C.E.M., program consultant, Schools for
Energy Efficiency (SEE) Program, Hallberg Engineering Inc., closed the session
with a presentation on energy-reduction strategies for schools.
The SEE program that Karnuth works on is designed to help
K-12 schools save energy. Goals are to reduce energy use by 10 percent; engage
students, teachers, and staff through active participation; and achieve
recognition through Energy Star. The program provides a basic step-by-step plan
to save energy and heighten energy awareness. It is a five-year program. “The
first three years are the core in creating sustainability in the program,” said
SEE schools are required to become Energy Star partners.
School districts use Portfolio Manager to enter their energy data to rate their
buildings. This helps the schools to improve their energy performance.
Initially, some schools thought they were already doing well
regarding energy use and improvement wasn’t that significant. After all schools
bought into the program, “Improvement was almost exponential,” Karnuth
Recognition for the schools for their achievements is very
important, he said. Twelve districts have earned the Energy Star Leader Award
and 72 schools have attained the Energy Star label. The SEE program has grown
and is now approaching 400 schools participating in the program.
Karnuth then presented the energy-saving numbers. Reduction
in energy use has ranged from 10-20 percent. Energy cost avoidance is $7.4
million. Average return on dollar invested is $2.68.
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Publication date: 11/12/2007