1. Phoenix Convention Center Phoenix, Arizona Retrofits of Existing Distributed and District Systems: Case Studies [Track Title][Session Title] Robert R. Somers II 2rw Consultants, Inc. [August 12, 2015]

2. Energy Exchange : Federal Sustainability for the Next Decade 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 2

3. Energy Exchange : Federal Sustainability for the Next Decade Pine Bluff Arsenal, AK Decision Factors High cost of replacing underground steam piping Infrequent, intermittent conditioning/process requirements 3

4. Energy Exchange : Federal Sustainability for the Next Decade Existing chillers had received end of useful lives 4 Bardolph Building Chiller Plant Replacement, Greensboro, NC

5. Energy Exchange : Federal Sustainability for the Next Decade Decision Factors Adjacent CNW Plant had: Excess capacity Many years of remaining life Ice storage capability Reduced maintenance costs Reduced capital costs 5 Bardolph Building Chiller Plant Replacement, Greensboro, NC

6. Energy Exchange : Federal Sustainability for the Next Decade Naval Hospital, Pensacola FL Upgrade of central CNW plant dedicated to hospital 6

7. Energy Exchange : Federal Sustainability for the Next Decade Naval Hospital, Pensacola FL Decision Factors Continuous operation of CNW plant to support ongoing mission Capacity of existing systems 7

8. Energy Exchange : Federal Sustainability for the Next Decade Hot water needed for reheat during summer months generated using stem Chilled water from central plant unable to meet peak loads 8 Library of Congress: Madison Building Washington, D.C.

9. Energy Exchange : Federal Sustainability for the Next Decade 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 9 Library of Congress: Madison Building Washington, D.C.

10. Energy Exchange : Federal Sustainability for the Next Decade 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 10 Stoneham Housing Authority Stoneham, MA

11. Energy Exchange : Federal Sustainability for the Next Decade 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 11 Stoneham Housing Authority Stoneham, MA