Rooftop Units Reducing School's Operating Costs, Environmental Impact

Oct. 1, 2010
AAON2425 S. Yukon Ave.Tulsa, OK 74107918-583-2266www.aaon.comCircle 70 At Eagle Mountain Elementary School in Fort Worth, Texas, older HVAC units were

2425 S. Yukon Ave.
Tulsa, OK 74107
Circle 70

At Eagle Mountain Elementary School in Fort Worth, Texas, older HVAC units were noisy and not very energy-efficient.

AAON provided 60 RQ Series (available from 2 to 6 tons) and six RN Series (available from 6 to 70 tons) geothermal-heat-pump rooftop units to Eagle Mountain Elementary School. Operating as single-zone variable-air-volume (VAV) rooftop units with a high-efficiency variable-capacity compressor and variable-speed fan, the geothermal heat pumps provide significant energy savings.

Single-zone VAV systems provide significant energy savings and are quieter and provide better humidity control than traditional constant-volume units. The Eagle Mountain Elementary School units include air-side economizers so cool outside air can be used when practical. This provides even greater energy savings. All of the units include a factory-installed 115-V convenience outlet for easy maintenance.

When teachers and students returned to school after summer vacation, they noticed a quieter and more comfortable classroom environment. The variable-speed fan provides a reduction in classroom noise, while the single-zone VAV units precisely control the temperature of the classrooms. Eagle Mountain-Saginaw Independent School District was able to significantly reduce the school's total energy usage. The geothermal heat pump provides significant energy savings year-round, while the single-zone VAV system provides significant energy at part-load conditions. The operation of the geothermal heat pump in the single-zone VAV configuration with an air-side economizer allows Eagle Mountain-Saginaw to significantly reduce the school's environmental impact and operational costs.