Inside This Issue - Plant Operations - University of Michigan
Inside This Issue - Plant Operations - University of Michigan
Inside This Issue - Plant Operations - University of Michigan
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UTILITIES &<br />
PLANT ENGINEERING<br />
Chiller <strong>Plant</strong> Upgrade Provides Over<br />
$1 Million in Utility Savings<br />
by Mark Mau, P.E.<br />
in a net $1 million savings for the year. It is expected<br />
that with a full season <strong>of</strong> operation, the savings next<br />
year will be even higher.<br />
1300 ton electric centrifugal chiller<br />
Last spring, a project to add a new high efficiency<br />
electrical chiller to the East <strong>University</strong> Chiller<br />
<strong>Plant</strong> was completed. In less than one season, the<br />
chiller plant more than met savings expectations.<br />
The project was conceived and commissioned by<br />
Utilities and <strong>Plant</strong> Engineering, designed and<br />
constructed by Architecture Engineering and<br />
Construction, and funded through Facilities and<br />
<strong>Operations</strong>.<br />
Project challenges included keeping chilled water<br />
running to all the customer buildings while adding<br />
the new chiller to the plant system, then getting the<br />
total system up and running a full load. Several key<br />
<strong>Plant</strong> <strong>Operations</strong> staff kept things running during this<br />
transition; Mike Konwin (AC Chiller Systems), Dan<br />
Stroebel (DDC Controls) and Jim Beachum (DDC<br />
Controls). Nick Panzica (AC Chiller Systems) provided<br />
chilled water from the interconnected Hatcher Chiller<br />
<strong>Plant</strong> during the transition. Mark Mau and Jay Russell<br />
provided project engineering expertise.<br />
The same Skilled Trades and engineering team will<br />
be instrumental in the next large centrifugal chiller<br />
installation project taking place at the Chemistry<br />
building.<br />
The East <strong>University</strong> Chiller <strong>Plant</strong>, located beneath the<br />
Dennison courtyard, provides year-around chilled<br />
water cooling for Dana, Randall, West Hall, East Hall,<br />
Denison, Pharmacy, and CC Little. The plant contained<br />
three 1240 ton steam absorption chillers until last<br />
spring, when a new 1300 ton electric centrifugal chiller<br />
was added.<br />
When it gets warm enough outside to require a<br />
chiller, the new chiller is the first one to be turned<br />
on and the last one to be turned <strong>of</strong>f. <strong>This</strong> operating<br />
strategy <strong>of</strong> utilizing the high efficiency <strong>of</strong> an electric<br />
centrifugal chiller resulted in slightly higher electrical<br />
consumption, but the huge steam cost savings resulted<br />
$1 million in EUCP steam usage savings<br />
for the year<br />
4