The HVACR Training Authority™


Air Balancing Solution Brings Comfort to Academy

The Cyprus Classical Academy in Burnsville, MN, is a private school for gifted children; it offers one of the most unique and rigorous education environments in Minnesota. However, both teachers and students at the Cyprus Classical Academy were facing an unwanted challenge in their classrooms: dramatic temperature imbalances. Like many older buildings in the Midwest, Cyprus Classical Academy's 13,500 sq ft location dealt with hot and cold spots, along with stale, stuffy air. Students carried sweatshirts from room-to-room, as the temperature imbalance was so dramatic. Due to classroom layouts, large windows, insulation issues and inefficient placement of thermostats, the school's HVAC expenses were very high and a comfortable temperature was difficult to maintain. Cyprus teachers saw the installation as an opportunity to teach their students about the real-world applications of STEM, including the importance of energy efficiency and air quality.

Cyprus students met with 75F technicians to discuss HVAC concepts and challenges. They analyzed the building and observed how the system was configured. For the students, highlights were drilling holes in their classroom walls to install sensors and running up step ladders to install equipment in the ceiling. After watching an instructional video, the students paired the controllers  via  Bluetooth  and  commissioned  the  system  through  the  school  Wi-Fi. They even hand drew a floor plan of the school and uploaded it to the 75F portal as a part of the commissioning process.

The 75F Dynamic Airflow Balancing Solution (DAB) solution was implemented in the newly-created 22 zones. The 75F Outside Air Optimization (OAO) solution was installed in three zones, monitoring CO2 and managing indoor air quality. Both solutions included the new highly-adaptable 75F Smart Node™ equipment controller, which has easy Bluetooth pairing, an OLED screen and onboard controls for setup and testing.

Both the DAB and OAO solutions include 75F Remote Temperature and Humidity (RTH) sensors installed in every classroom, taking thermal snapshots every 60 seconds. Sensor data is analyzed along with weather forecast data via cloud analytics, to send the optimal control strategy to the Central Control Unit (CCU).

With 75F, Cyprus resolved issues with stuffy air. Schools typically face high C02 levels: A recent study by the International Journal of Indoor Environment and Health found that found carbon dioxide levels of classrooms in the California school  system  were  as  high  as  2200  ppm, which  is  more  than  twice  the  recommended level, and almost three times the levels typically found in an office setting. Built-in C02 monitoring is a part of Outside Air Optimization and by bringing in outside air when appropriate, OAO keeps C02 levels in the building under 1,000 ppm for Cyprus.

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