Central Utility Plant

  • Baltimore Convention Center – Chiller Plant

    This was a large-scale chiller replacement and capacity upgrade project located at the Baltimore Convention Center in Baltimore, Maryland. Plant 1 is one of three plants that feed Veolia’s district chilled water loop, serving many buildings in Baltimore City.

    The design called for the removal of all major mechanical equipment and piping, and was replaced with the following:

    3 ea. – 1800 Ton Trane Dual Compressor Chillers w/ Ice Mode (OFE)
    9 ea. – 600 Ton BAC Cross Flow Cooling Towers w/ VFD’s (OFE)
    3 ea. – 3700 GPM Inline Condenser Water Pumps w/ VFD’s

  • Fort Detrick – Chiller Plant

    This design/build chiller replacement project was based on a 35% design and was part of an energy conservation measure to reduce KW/ton. During the design phase, the configuration was changed from a constant volume primary/secondary pumping arrangement to a variable primary pumping arrangement. The project also included distribution piping to additional buildings, and replacing the existing local air-cooled chillers by placing the building on the chilled water loop.



    The design called for the removal of all major mechanical equipment and piping and was replaced with the following:

    4 ea. – 600 Ton Daikin Magnetic Bearing Chillers
    2 ea. – 1200 Ton BAC Cooling Towers w/ VFD’s
    4 ea. – 1200 GPM 60 HP Chilled Water Pumps w/ VFD’s
    4 ea. – 1800 GPM 80 HP Condenser Water Pumps w/ VFD’s
    1 ea. - 211 Gallon Expansion Tank
    1 ea. – 3600 GPM Air Separator
    3 ea. – Greenheck Exhaust Fans Sidewall Direct Drive – 9300 CFM’s total

    The work also consisted of a major electrical upgrade which included a new primary service to the building. A new 2500 KVA transformer and 4000 AMP switch gear was provided to feed the four new chillers, as well as the existing MCC which fed the pumps, cooling towers, fans, and other building services.

    New structural steel and foundations were provided for the new cooling towers, and miscellaneous concrete and architectural work was performed within the building to accommodate the new equipment. A new motorized roll-up door was also provided for access and refrigerant exhaust purposes.



    The 1040 Chiller Plant provides chilled water to vital scientific labs and other critical operations facilities on the campus which require critical environment control. Due to the unseasonably warm fall and winter of 2015/2016, extreme contingency plans were incorporated into the project to insure the availability of chilled water to the facilities. These plans included temporary chillers and generators, sequenced work and outages, and later, temporary cooling towers to allow the early start-up of additional permanent chillers.

  • John Hopkins Hospital – South Power Plant Expansion

    Phase One

    Installation of two 3,500-ton chillers and two field erected 2-cell cooling towers (5,250 gpm of water each), domestic water filtration system, four 150-hp primary pumps, one 900-hp secondary pump and VFD, and three 300-hp condenser water pumps. In addition to rigging and setting the equipment, Green also provided all of the interconnecting piping ranging from 6” to 42” pipe, cooling tower support steel, and a service tunnel which connected the new plant services to the existing facility. Green was also responsible for the project controls, start-up and commissioning.


    Phase Two

    Installation of two additional 3,500-ton chillers, cooling towers, domestic water filtration system, and associated pumps, piping, steel and controls. All mechanical and steel work was performed by Green Contracting.


    Phase Three

    Installation of one 3,500-ton chiller, primary chilled water pump, condenser water pump, secondary chilled water pump, electrical power systems, and the installation of new controls to expand the existing controls systems. Green performed the complete mechanical and structural package and subcontracted the electrical and controls work. This phase increased the total plant capacity to 17,500 tons.

  • Chevron – Central Utility Plant

    This project consisted of five simultaneous projects to construct a boiler plant, chiller plant, diesel UPS plant, diesel fuel facility and 2 miles of underground chilled water, high-pressure steam and pump condensate piping. The project was completed on an accelerated basis and all systems were commissioned and operational in 8 months.  Green Contracting’s Service Department provided all of the startup and commissioning services for this project.