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