The 75F Solution
Border Foods tested the 75F Dynamic Airflow Balancing solution at their Taco Bell store in Richfield, Minn. 75F installed internet-connected airflow balancing devices to solve the problem in the kitchen and dining areas. By obtaining a live weather feed and collecting empirical data about everything going on inside and outside the building, the 75F cloud-based algorithm was able to learn and adjust the balance of airflow. This caused temperatures to become uniform throughout the day. Equipment included two Central Control Units, 11 Zone Controllers and 19 Modulating Dampers that were all installed and commissioned in less than a day. 75F also added Outside Air Optimization and Building Pressure Control to create positive pressure in the dining space to diminish drafts and keep odors contained in the kitchen.
Within 24 hours, the kitchen staff noticed relief from the heat island in the center of the kitchen. Temperatures leveled out between the front and back of the kitchen to create a uniform environment. The dining area also leveled out so that morning and evening diners did not have to choose between east and west facing tables. To prove the point, Border Foods authorized a short test where 75F balancing activity was briefly suspended so they could observe what conditions were like with the previous static balancing equipment. Within minutes, heat islands shot up in the kitchen. The imbalance rose 10 F before the test was concluded.
Border Foods also noticed improvement in regards to pressure balance. Prior to 75F, Border Foods experienced a pressure reading of -0.19-inches WC (water columns), which caused problems opening doors. After 75F implemented Building Pressure Control, they maintained a reading of 0.03-inches WC, which eliminated drafts.
Without the 75F system, Border Foods would have been commissioned to respond to the Minnesota winter, warming up the building whether or not the area was occupied. With the 75F solution, the system was able to take weather forecasts and pro-actively commission the building appropriately. Since installation, both staff and guests have enjoyed comfort throughout the building.