TABLE OF CONTENTS - Everything R744

District Heating and Cooling
NH 3
: Beneath the streets of downtown Chicago, a
network of pipes distributing chilled water forms part of
one of the world’s largest interconnected district cooling
systems. Ammonia chillers, ice tanks, and river water
chillers provide cooling for air conditioning in buildings,
removing on peak grid stress. Chicago’s thermal district
cooling system serves around a hundred buildings and
upwards of 45 million sq. ft. (4 million m 2 ) of space. In the
basement of the Blue Cross/Blue Shield headquarters
on Randolph Street in Illinois, you can find P3, housing
three large ice tanks and an ammonia chilling plant.
The ammonia chillers and ice tanks replaced a previous
30,000-ton R22 plant.
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