Marcella Niehoff School of Nursing, Commissioning - Chicago
LEED Fundamental and Enhanced Commissioning for a newly constructed 58,000-square-foot educational building, including mechanical, electrical, and plumbing systems.
The project achieved LEED Gold certification.
Commissioned systems included a 400-ton chiller plant with hydronic economizer, cross-connected to a campus chilled water loop; a heating plant with steam from a campus steam loop; a displacement ventilation air handling unit with sensible and energy recovery heat wheels; a dedicated outdoor air system for ventilation air; a slab radiant cooling system; a solar shaft to preheat outdoor air in winter and serve as a relief chimney during natural ventilation; automatic operable windows for natural ventilation; and lighting systems with daylight harvesting controls.
Examples of issues uncovered and resolved during functional performance testing included inoperable and improperly operating windows (natural ventilation mode); hydronic economizer changeover setpoint too low (resulting in excessive chiller operation); and relative humidity sensors for the AHU reading inaccurately low, causing humidifiers to run unnecessarily.
Terminal air boxes serving bathrooms were removed from the list of boxes resetting the AHU static pressure. This improvement resulted in a reduction of the setpoint and reduction of fan energy consumption.