Throughout the project, there were numerous challenges that required collaboration between all sides of the design and construction team. One situation that emerged during the design process led to a critical change to the plans for the central energy plant (CEP).
“The original concept was to expand the existing CEP to serve the new tower,” said Jon Carter, WSP project manager and lead electrical engineer. “But cost, lack of room to expand and routing of services through the existing building quickly led the team to determine that a new remote CEP was the best option.”
The new CEP would be required to house the chilled water and heating water systems, along with medical air and vacuum systems, to serve the new tower. The CEP features heat pump chillers. Emergency power, steam production and bulk oxygen would still be supplied by the existing CEP.
“We collaborated with design-assist mechanical and electrical contractors to determine the most effective and efficient routing of services through the existing building,” Carter said.
In the existing CEP, the emergency power system was expanded. A new 2.25 megawatt medium voltage generator was installed and then paralleled with the existing 2.25 megawatt medium voltage generator.
The building utilizes the concept of off-site prefabricated MEP corridor rack systems. The use of the rack systems allows for increased quality control as the contractors are working on the ground instead of overhead. It also reduces the installation time in the field.
WSP also worked closely with the contractor on the design of the two 180,000 cubic feet per minute (CFM) air handling units (AHUs) to serve the patient floors.
“Square footage is always at a premium, and this led us to having to design and locate the two large AHUs on the roof of the building to serve nine of the patient floors,” Carter said.
It took extensive coordination with the design team to prepare the structural support and arch with the roof, the construction team for the unit construction and manufacturer selection, and ProMedica to ensure they had the ability to maintain the units.