Phoenix Convention Center • Phoenix, Arizona
Retrofits of Existing Distributed and District Systems:Case Studies
[Track Title] [Session Title]
Robert R. Somers II2rw Consultants, Inc.
[August 12, 2015]
Energy Exchange: Federal Sustainability for the Next Decade2
Pine Bluff Arsenal, AK
• Decentralized existing central steam systems.• Steam used for:
• Space heating• Dehumidification• Process
• Deteriorating underground distribution system.• Compromised or missing
pipe insulation• Insufficient cathodic
protection
Energy Exchange: Federal Sustainability for the Next Decade3
Pine Bluff Arsenal, AK
Decision Factors• High cost of replacing
underground steam piping
• Infrequent, intermittent conditioning/process requirements
Energy Exchange: Federal Sustainability for the Next Decade4
• Existing chillers had received end of useful lives
Bardolph Building Chiller Plant Replacement, Greensboro, NC
Energy Exchange: Federal Sustainability for the Next Decade5
Decision Factors• Adjacent CNW Plant
had:• Excess capacity• Many years of
remaining life• Ice storage capability
• Reduced maintenance costs
• Reduced capital costs
Bardolph Building Chiller Plant Replacement, Greensboro, NC
Energy Exchange: Federal Sustainability for the Next Decade6
Naval Hospital, Pensacola FL
• Upgrade of central CNW plant dedicated to hospital
Energy Exchange: Federal Sustainability for the Next Decade7
Naval Hospital, Pensacola FL
Decision Factors• Continuous operation
of CNW plant to support ongoing mission
• Capacity of existing systems
Energy Exchange: Federal Sustainability for the Next Decade8
• Hot water needed for reheat during summer months generated using stem
• Chilled water from central plant unable to meet peak loads
Library of Congress: Madison BuildingWashington, D.C.
Energy Exchange: Federal Sustainability for the Next Decade9
Decision Factors• Heat recovery chiller provides hot water at
building at lower cost than central steam• Local chiller provides chilled water at lower cost
than system
Library of Congress: Madison BuildingWashington, D.C.
Energy Exchange: Federal Sustainability for the Next Decade10
• Existing systems were energy-cost intensive• One site heaped with
electricity• One site heaped with
fuel oil• Oil-fired systems were
at end of useful life• Cost and effort
needed to monitor fuel oil storage
Stoneham Housing AuthorityStoneham, MA
Energy Exchange: Federal Sustainability for the Next Decade11
Decision Factors• High cost of electricity for
space heating• Constant need for domestic
hot water• Difficulty and cost for
relocating current residents• High capital cost to install hot
water heating distribution at all electric site
• Simultaneous peak in electricity, heating, hot water requirements (winter months
Stoneham Housing AuthorityStoneham, MA
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