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ENERGY FACT: 1 BTU IS THE AMOUNT OF WORK NEEDED TO RAISE THE
TEMPERATURE OF 1 POUND OF WATER BY 1 DEGREE F. ONE 4-INCH
WOODEN KITCHEN MATCH CONSUMED COMPLETELY GENERATES ABOUT
energy savings in small ( 5,500 square
feet), medium (53,630 square feet) and
large office buildings (498,500 square
feet) in 16 climate zones across the U.S.
Estimated Savings from WPT
The research concludes that
retrofitting with WPTs is an economically
viable best practice for GSA in all
climate zones and building sizes. The
technology is commercially available
and the hardware has a projected life of
more than 10 years. Installation estimates
ranged from 50 cents to $1.20 per square
foot (see box).
Small office buildings offer the shortest
estimated paybacks at an average of 4. 3
years across all climate zones, while
medium and large office buildings were
estimated to have average paybacks
of 6. 3 and 5. 5 years respectively. The
estimated savings were based on the
simplest occupied/unoccupied setpoint
schedules. Researchers believe that more
sophisticated scheduling strategies would
produce larger savings.
Caveats for implementation include
determining how well wireless signals
travel through a building because
construction type and materials affect
signal transmission. Also, some training is
required for operators.
For more information on the estimated
savings for the three office types in
specific climate zones, see Wireless
Pneumatic Thermostat Evaluation: Ronald
Reagan Building and International Trade
Center at www.gsa.gov.
Wireless Thermostats Provide Cost-effective
Upgrade for Pneumatic Controls continued from page 11
Estimated Costs for
( 5,500 ft2) × ($0.70 to $1.20 per ft2) =
$3,850 to $6,600 installed cost.
(53,630 ft2) × ($0.60 to $1.10 per ft2) =
$32,200 to $59,000 installed cost.
(498,500 ft2) × ($0.50 to $0.90 per ft2) =
$249,000 to $449,000 installed cost.
Source: Wireless Pneumatic Thermostat
Evaluation: Ronald Reagan Building and
International Trade Center, a report
prepared for GSA by the Oak Ridge