Defiance City Elementary School
The new 2-story elementary school included complete mechanical, electrical, and plumbing system designs to acquire a more sustainable building design. The project is currently under review by the U.S. Green Building Council. The efficient design is reinforced in the Energy and Atmosphere Credit 1; Optimize Energy Performance; as the project is attempting 5 of the 10 possible credit points.
Defiance City School will be a kindergarten through fifth grade school complex with approximately 1600 occupants in more than 127,000 square feet in area. The HVAC systems were designed to reduce energy consumption and to allow the Owner complete flexibility in scheduling the use of the building.
HVAC Systems Include:
103 Geothermal Heat Pumps with a minimum rating of 21 EER (energy efficiency ratio) to provide simultaneous heating and cooling.
Eight (8) Energy Recovery Units to transfer a percentage of the exhaust sensible and latent energy to the incoming ventilation air. The total thermal efficiency in the heating season is between 45% and 70% and between 30% and 55% in the cooling season. Also, two of the energy recovery units have VFD’s on the supply and exhaust fans.
Variable flow water system consisting of two (2) 560 gpm pumps run in parallel with VFD’s distributes the glycol solution from the well field (consisting of 120 holes, each 300 feet in depth) to the heat pumps throughout the building.
Geothermal well field diverting valve redirects the system water away from the well field and circulates the water only within the building. It saves on two-thirds (2/3) of the pressure on the pumps allowing them to slow down to save energy.
DDC control system controls all space temperatures and HVAC equipment operation.
Electrical Systems Include:
The lighting system incorporates energy efficient sources and automatic control for maximum energy savings, control and flexibility.
All classrooms have infrared motion detectors for automatic control with local switches for override off.
Corridor and large venue spaces such as Dining and Gymnasium are controlled by a low voltage relay lighting system with programmable timing control.
Fluorescent lighting in the building incorporates a Master/Satellite ballast arrangement cutting the quantity of ballast in half. All ballast are energy efficient electronic type.
Gymnasium fixtures utilize Pulse Start technology for reduces power consumption.
Cable tray is made of 100% re-cycled material.
ASHRAE 90.1 interior and exterior watt density levels have been met for the entire complex. Exterior parking area watt densities are under the ASHRAE 90.1 levels by 12.58 KW.
Fluorescent lamp sources utilized on the project meet the Federal TCLP (Toxic Characteristic Leaching Procedure) criteria as non-hazardous waste.
Transformers in the facility are TP-1 high energy efficient design.