City Hall HVAC System Improvements Project RevisedMasterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: City Hall HVAC System - Update
DATE: March 30, 2011
Dubuque
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Building Services Manager Rich Russell and Sustainability Coordinator Cori Burbach
have provided updated information on the water -usage data for City Hall for the HVAC
system.
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Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Cori Burbach, Sustainability Coordinator
Rich Russell, Building Services Manager
Michael C. Van Milligen
Masterpiece on the Mississippi
TO: Michael Van Milligen, City Manager
FROM: Cori Burbach, Sustainability Coordinator
Rich Russell, Building Services Manager Lti'---
SUBJECT: City Hall HVAC System -- Update
DATE: March 28, 2011
DISCUSSION
We reviewed the water -usage data at City Hall and found the following:
Dubuque
AI- American
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2007
INTRODUCTION
The purpose of this memorandum is to update you on the request to upgrade the
existing City Hall HVAC system in order to save significant potable water and energy
resources. This item was originally brought to the City Council at their March 21, 2011
meeting. Some questions arose from the City Council on the accuracy of the numbers
presented.
The numbers presented at the March 14, 2011 City Council meeting are accurate for
the two -year period ending in March of 2010 where approximately 12 million gallons a
year were being used.
Further review of the water usage of the cooling units indicates that five of the six water -
cooled units are metered through the main City Hall meter. The last 12 months of
readings from this meter show usage of approximately 7.0 million gallons of water. The
sixth water - cooled unit is metered separately and shows usage of approximately
857,000 gallons in the last 12 -month period.
If the one unit metered separately can be considered average, City Hall used
approximately 5 million gallons of water for cooling during the last 12 months, compared
to the previous annual usage of 12 million gallons. A valve that was not closing was
allowing water to be wasted. This valve was replaced near the end of the two year
period showing an annual usage of approximately 12 million gallons. A slight downturn
can be seen near the end of the original metering reporting period. This reduction
continues during our most - recent monthly readings. Regardless of the number, the
amount of water wasted is too high.
NEXT STEP
Based on the previous City Council approval, the City will then hire an engineer to
provide design options for the water piping changes and cooling tower location.
Cc: Cindy Steinhauser, Assistant City Manager
Jenny Larson, Budget Director
Paul Schultz, Resource Management Coordinator