Zero Energy Certified

ADLAI STEVENSON HIGH SCHOOL EAST ADDITION

VITAL STATS

Certification StatusZero Energy Certified
Version of LBC3.1
LocationLincolnshire, IL, USA
TypologyBuilding
Project Area53,800 SF
Start of OccupancyAugust 2019
Owner OccupiedYes
Occupancy TypeEducational Building
Number of Occupants560
Photo Courtesy of Adlai Stevenson High School

PROJECT TEAM

OwnerAdlai Stevenson High School
Building OperatorSodexo School Services
ArchitectWight & Company
Sustainability ConsultantWight & Company
Structural EngineerWight & Company
MEP EngineerWight & Company
Civil Engineer & Landscape ArchitectEriksson Engineering Associates, Ltd.
Living Wall DesignNedlaw Living Walls
Photovoltaic DesignSEI Professional Services
Technology DesignPentegra Systems LLC
Greenhouse DesignRough Brothers, Inc.
Construction ManagerGilbane Building Company
Commissioning AgentAero Building Solutions
Photovoltaic InstallerGurtz Electric Company

BUILDING SYSTEMS INFORMATION

Wall R value18
Roof R value30
Floor R value2
WindowsDouble Pane Low-e. U values = 0.3, SHGC = 0.2
Air Sealing ProtocolContinuous air barrier membrane was installed on building envelope.
Photo Courtesy of Adlai Stevenson High School

MECHANICAL SYSTEM DESCRIPTION

A dedicated Outside Air Unit provides outside air ventilation, as required by code. It provides room neutral temperature to allow the efficient VRF system to modulate space temperature.

VENTILATION SYSTEMS

The dedicated Outside Air Unit provides code required outside air ventilation. The energy recovery wheel preheats and precools the outside air from the exhausted air.

LIGHTING

An optimal lighting environment for educational use combined with high-efficiency energy-saving measures was the driving force for the lighting design of the project. It was important to reduce lighting energy usage beyond the code mandated levels while not compromising on providing a comfortable and well-lit space for the students. Multiple layers of light sources for a space enable the user to create different lighting scenes based on the need of the space. A thorough artificial lighting photometric study was conducted early on in the process to help guide the final layouts. These early studies helped achieve the goal of proper distribution and the highest energy savings. Lighting fixture selection was critical to the design and thus all fixtures selected to be high efficient dimmable LED type with 80+ CRI rating. The lighting system is provided with fully automated controls. The control system allows the facility staff to monitor and control lighting for the entire facility from one central location. Multiple levels of preprogrammed and custom timer options are available for the end-user via the control system. Scene setup switches with dimming capability, occupancy, and daylight sensors are provided in all the spaces to minimize energy usage and maximize the use of natural light. Public spaces are also equipped with occupancy and daylight sensors to minimize lighting usage when there is minimal or no activity.

Photo Courtesy of Adlai Stevenson High School

RENEWABLE PRODUCTION SYSTEMS INFORMATION

Panel Array Size465 kW
Panel Output Per Capacity Nameplate340 W
Panel Quantity1,370
Panel Type and BrandMono-crystalline, Canadian Solar
Inverter Quantity20
PV LocationOn-site roof-mounted
Photo Courtesy of Adlai Stevenson High School

PERFORMANCE

Actual energy use during performance period539,336 kWh
Actual energy produced during performance period542,784 kWh
Net Energy Use-3,448 kWh
EUI32.4 kBTU/sf/yr
Photo Courtesy of Adlai Stevenson High School

OCCUPANCY

The project is a high school classroom addition. It is used regularly as a school, with some summer use.

The East Building Addition was mostly operational during Covid-19 although at reduced capacity. While the building experienced a shut down from May through early August, as a school building, the building was not intended to be used during those months under normal operation. While the school district returned to session as mostly remote, in August 2020, the East Building Addition was used to conduct in-person classes for special education students. In addition, teachers used the classrooms as their home bases to conduct remote teaching.

The team found that when the building set points were put into occupied mode, the energy use closely mirrored the predicted consumption for HVAC which showed us that the building was much less occupant sensitive than was anticipated. Clear usage patterns show distinct consumption patterns between occupied and unoccupied modes. What was eye-opening to the team, was the discovery that buildings are “On” or “Off.” At all times, there is a base load energy consumption attendant with many of the systems in the building. In addition, there was unanticipated energy use in the run-up to the school year for deep cleaning as the district did not know until very late whether it would open for in-person, hybrid or remote learning.

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