University of Maryland College Park

University of Maryland College Park
District Energy System
IDEA Campus Energy Conference
February 9, 2012
UMCP District Energy System
The University of Maryland district energy system consists of a well designed
infrastructure tying together heating, cooling and power systems through state
of the art CHP and chilled water facilities. The system consists of:
 A steam system capable of distributing waste heat through 15 miles of
underground piping for heating, humidification and cooling.
 A condensate return system designed to return approximately 70% of the
condensate produced in the system
 Chilled water systems incorporating large steam turbine driven chillers that
can utilize the waste heat generated by the CHP during summer months
 Centralized electrical distribution to consolidate serving the UMCP load
 A combined heat and power plant that can supply up to 27MW of power and
280,000 LB/HR of steam at 115 PSIG
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The University of Maryland District Energy System
Steam and
Condensate
Distribution
•110+ Steam Services
used for heating, hot
water, humidification and
cooling
•115 PSI Saturated
conditions; 220,000 Lb/Hr
peak winter use
•15+ Miles of Piping
•125+ Manholes
•Great heat sink for
waste heat from the CHP
•Approximately 70%
condensate return
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The University of Maryland District Energy System
Electrical Distribution
•13KV Distribution system
•9 Feeders supplying the
campus
•200+ manholes and many
miles of duct bank
•Fed by PEPCO and CHP
•Over 200 Building services to
include 13KV switch,
transformer and 480V building
feed
•Loop feed allows isolation of
faults without affecting other
facilities
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The University of Maryland District Energy System
SCUBs (Chilled/Hot
Water Facilities)
•Increased efficiencies due to
larger centralized production
•Greater reliability due to
multiple sources of chilled
water for each user
•Increased system efficiencies
through the use of steam
driven chillers utilizing waste
heat from the CHP
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Project History
Completed in 2002, the project was aimed at improving
efficiencies and using those savings to fund infrastructure
improvements. The improvements included:
Steam and Condensate System

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Manhole improvements including trap replacements, insulation and
supports.
Metering improvements to improve accuracy and reliability
Condensate improvements to improve quantities recovered and
quality
Modeling of the system to help with planning for the future
13 KV Electrical Distribution System



Replace failing, smaller feeders with new 750 and 500 MCM
cabling
Add distribution equipment at the new CHP to serve the new
generation equipment
Modeling of the system to predict loading
Chilled Water System


Construction of central chilled water facility for approximately 20
core buildings
Installation of steam turbine driven chillers to utilize the waste heat
Power Plant

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Replacement of existing 40 year old boilers with new low NOX
cogeneration equipment
Installation of Low NOX burners on existing boilers that remained
as backup
Installation of new auxiliary equipment
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UMCP CHP Cogeneration Plant
The 27MW, 280,000 LB/HR Combined Heat and
Power plant (CHP) was completed in 2002. It
was designed with distribution system
improvements in mind to maintain peak
performance. The design criteria consisted of the
following:

Two GE10B low NOX turbines, 11MW each,
heat recovery steam generators and a 5MW
back pressure steam turbine generator. The
sizing was based on the minimum demand
of the University so that it would always run
at full load with the lowest heat rate.

Two York 1900 ton steam turbine driven
chillers, sized to use the excess waste heat
generated during summer months.

Electrical distribution improvements to allow
distribution of the CHP plant power
throughout the University and minimize local
distribution company demand.
It has worked very well. We are at peak power
production throughout the year with no loss of
waste heat.
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The University of Maryland District Energy System
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The University of Maryland District Energy System
Any Questions?
Hold up your hand!
or contact:
Chuck Edwards
301-405-1229
charles.edwards@gdfsuezna.com
Thank You!
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