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CUSTOMER PROFILE

Comfort Link®, a general partnership between Constellation Energy subsidiary Baltimore Gas and Electric Company and EMCOR Group, Inc., has been providing cooling to buildings in the downtown Baltimore business corridor since 1996. Its 48 customers include federal, state, and Baltimore City government buildings, entertainment and retail establishments, commercial office buildings, hotels, hospitals, and religious and other non-profit facilities. These customers include: City Hall, the Baltimore Convention Center, The Rouse Company's Harborplace, the France-Merrick Performing Arts Center, Clarence M. Mitchell Courthouse, Peoples' Court, Garmatz Courthouse and Fallon Federal Building, the U.S. Customs House, U.S. Appraisers Stores and the Central District Police Station.

Delivering more than 32,000 tons of cooling capacity and approximately 40 million ton-hours of low-temperature chilled water to cool over 11.5 million square feet of conditioned space, the Comfort Link system is one of the largest ice thermal storage systems in the country. Founded in 1996 to provide cooling to downtown Baltimore at a time when building owners were facing the expense of replacing aging cooling plants to meet more stringent environmental regulations, Comfort Link presented a cost-effective alternative to replacing, operating and maintaining their own equipment-a central, competitively priced, comfortable, and reliable district chilled water system owned, operated and maintained by a third-party. Today, with nine full-time employees and three "networked" chilled-water chilling facilities, Comfort Link continues to grow as more customers discover its benefits.

HIGHLIGHTS

  • Capital investment of $80 million
  • Total system cooling capacity of 32,000 tons
  • More than 10 miles of chilled-water distribution system piping

    • TECHNICAL SPECS

  • Total system cooling capacity of 32,000 tons
  • More than 10 miles of distribution system piping
  • Chilled water is distributed at 37°F

    • Peak Cooling System Capacity

  • Current - 32,000 tons
  • Future - 41,650 tons

    • Distribution System

  • Below-ground distribution system constructed of ductile iron pipe with mechanical joints
  • Above-ground system is welded steel
  • Total length of combined supply and return piping-more than 10 miles


    • CONTACT
    Dennis Manning
    General Manager
    6 South Frederick Street
    Baltimore MD 21202
    410-783-1880
    www.comfortlink.com


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    Plant 1- Baltimore Convention Center Chilling Station

  • Began service in July 1996
  • Peak cooling capacity (including ice thermal storage)-10,800 tons

    • Chillers

  • Three field-erected, built-up, rotary screw compression refrigeration chillers
  • Each of six compressors is rated at 625 tons in ice duty and 900 tons in standard duty
  • Total chiller capacity - 5,400 tons
  • Refrigerant HCFC-22

    • Thermal Storage

  • Ice on coil thermal storage - 48,000 ton-hours

    • Distribution Pumps

  • Three variable speed distribution pumps
  • Design flow - 10,500 gpm

    • _______________________________________________________________________

    Plant 2 - Market Center Chilling Station

  • Began service in June 1999
  • Peak cooling capacity (including ice thermal storage) - 12,750 tons

    • Chillers

  • Three 2000-ton centrifugal chillers
  • Three rotary-screw industrial chillers -- 935 tons each in ice duty and 1,250 tons each in standard duty
  • Total chiller capacity - 9,750 tons
  • Refrigerant: centrifugal/screw chillers - HFC-134A/HCFC-22

    • Thermal Storage

  • Ice on coil thermal storage - 27,000 ton-hours

    • Distribution Pumps

  • Five distribution pumps, four variable speed and one constant speed
  • Design flow -18,300 gpm

    • _______________________________________________________________________

    Plant 3 - Municipal Center Chilling Station

  • Began service in December 2001
  • Peak cooling capacity - 6,500 tons

    • Chillers

  • Five centrifugal chillers using HCFC-123

    • Current Capacity

  • Total current - 6,500 tons
  • Future design capacity - 16,000 tons

    • Distribution Pumps

  • Six distribution pumps, three variable speed and three constant speed
  • Design flow (current) - 17,700 gpm
  • Design flow (future) - 24,000 gpm


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