We developed detailed design and construction documents when the project moved to the design phase. The work included replacement of existing boilers with four 30,000 lbs/hr industrial watertube high-pressure steam boilers, with low nitrogen oxide burners that use natural gas and #2 fuel oil to reduce overall emissions.
The project also included replacement of the existing boiler feedwater pumps, boiler blowdown systems, fuel oil pumps, and underground fuel oil tanks. The new boilers included economizers and flue gas recirculation. A modern burner management system and combustion controls system for the plant were included in the design.
For the chiller plant, we provided design for a free cooling heat exchanger and new sand filtration system. The chilled water distribution system was converted from a primary-secondary pumping configuration to an all-primary pumping system. The chiller plant also received a controls upgrade with a continuous commissioning service. The service alerts operators when outdoor air temperatures are suitable for free cooling, or if one of the chillers seems to be low on refrigerant. These strategies help to conserve energy and reduce operating costs.
We maintained close coordination with hospital staff throughout the project to minimize the impact on day-to-day operations. We took special measures to meet this goal, including use of a temporary boiler system and development of detailed phasing drawings to reduce steam shutdowns during construction.
Our experience in designing and implementing energy system upgrades in active facilities, including those providing critical services such as healthcare, was instrumental in delivering the project successfully.