Box 3
Integrated Energy Generation Prototype
116
A prototype power plant could revolutionize on site
to help run a chiller is not new. What is new is for a
generation for businesses. Burns & McDonnell devel 
chiller of this size to be fueled by waste heat alone. The
oped, installed, and is testing (with Austin Energy) one
project's chiller is capable of delivering 2,500 tons of
of the largest integrated energy systems in the nation
chilled water, enough to cool 1 million square feet of
(Figure 11). This demonstration project uses the waste
office space. Operation, which began in June 2004,
heat exhaust from a natural gas fueled generator as the
should verify fuel efficiency of 70 to 80 percent against
only fuel source for a chiller that provides air condition 
the 55 percent efficiency of the best central power plant
ing. Recycling waste heat to power another generator or
technology available today.
117
Figure 11
Integrated Energy System  
Includes a Natural Gas Turbine and 
a Heat Recovery Chiller
Chilled Water
To the 
domain
Inlet Air
Cooler
Exhaust Stack
Ambient
Silencer
Air
Gas
Turbine
+
Generator
Diverter
Heat 
Exhaust 
Damper
Recovery Chiller
Stack
Gas
Compressor
Electricity
+
38
+
Towards a Climate Friendly  
Built Environment
<





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