Toledo Public Schools Hawkins Elementary

The new 60,000 sq. ft. 2-story elementary school included mechanical, electrical, and plumbing system designs that resulted in LEED Gold Certification for Schools by the U.S. Green Building Council.

The mechanical system included multiple indoor air handling units.  Most of the units are variable air volume units with a variable speed drive on the supply fan and have a chilled water cooling coil and hot water heating coil to maintain the discharge air temperature.  The air is distributed to fan powered variable air volume units with reheat to satisfy the space temperature.  Classroom air handlers include an energy recovery wheel with bypass and recirculation dampers for tempering the outside air.  The heating plant consists of a constant flow heating water system that utilizes high efficiency condensing boilers with hot water temperature reset.  The chilled water system utilizes a constant flow chiller with ice storage and two variable speed pumps running in parallel to distribute the water to the air handling units.  The entire mechanical control system utilizes an automated web-based direct digital control system.  This system is integrated with a global system at the Network Operation Center that monitors and manages all Toledo Public Schools.

The plumbing fixtures were selected with sustainability in mind incorporating low flow water closets, waterless urinals, battery operated wash fountains, and ultra-low flow aerators on hand lavatories.

The electrical distribution system utilizes distribution panels, lighting panels, and dry-type transformers rated for non-linear loads which feed the receptacle panels.   There are three (3) levels of surge protective devices incorporated in the power distribution system.  The infrastructure is in place for a future wind turbine/generator.  The building design includes an emergency generator for back-up of egress lighting and technology systems.

The lighting system is designed to exceed ASHREA 90.1 2004 Energy Standards.  This was accomplished by utilizing high efficiency ballast and energy efficient lamps.  In addition to the energy efficient design, there are occupancy sensors in the offices and small rooms.   There is a low voltage relay system to control corridors, large bathrooms, and large lighting areas in gymnasium, student dining, media center, and exterior lighting.   The low voltage relay system provides time scheduling and additional control capabilities.  The main lobby and gymnasium lighting were designed with day light harvesting switching.

The building incorporates Cat5E structured cabling system to the desktop from multi-layer core switches and edge switches in the central Equipment Room. A multi-mode and single mode fiber backbone along with a copper backbone connects additional equipment rooms to the main room. The core switch is connected to a district wide area network (WAN) via fiber.  Complete Wireless access for data and voice has been provided utilizing 802.11 n technologies.

Each classroom is equipped with classroom sound re-enforcement systems, LCD projectors, and DVD/VCR’s for audio visual presentations. A digital video distribution system with access to the central video servers at the owners Network Operations Center is via a VBRICK video system.

The Paging/Intercom is throughout the building via a microprocessor based central system tied into the Digital IP enabled PBX phone system and a tornado warning system is incorporated into the system for safety. Video announcements and messages are distributed throughout the complex via an electronic PC based Bulletin Board Messaging system and the digital VBRICK system.  Monitors are placed in public areas for displaying information to the students and staff.  Specialty sound systems are provided in dining, gymnasium, and music rooms.  Each system incorporates wired and wireless microphones; portable carts are used in gymnasiums.

Security system, access control, and intrusion detection are throughout the complex controlling access to and from the building.  The building is monitored by a coaxial analog camera system in the interior and exterior. All systems report back to the central monitoring center. Other systems in the building include a central synchronous clock system, wireless phones, and portable broadcast camera system.

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