【正文】 idifiers installed in the airImage: . 2021 DigitalGlobe Image: . 2021 DigitalGlobe technology award case studies Building at a Glance Name: Kahnawake Survival School Location: Kahnawake, QC, Canada Owner: Kahnawake Education Center Principal Use: School Includes: High School, Community Center, Public Assembly Employees/Occupants: 450 students Gross Square Footage: 60,000 ft2 Substantial Completion/Occupancy: August 2021 Occupancy: 100%handling units. During summer, a maximum of 60% is allowed (design criteria for offices). Considering the many types of activity occurring in the building (teaching, administration, munity activities, shows, sporting events, munity meetings and shelter), two basic options were analyzed: dedicated systems and centralized systems. After analysis, it was decided to bine both strategies. The use of a centralized system to condition the amount of outside air required and send it in all zones was the best solution. The capability to operate at variable flow was a major aspect of this system since classrooms and teaching areas are not used 24/7 while offices and administrative areas operate throughout the year. Because classrooms are not used during the hotter months of the year (from midJune to the end of August), cooling the classrooms and the gym was questioned. It was decided to use local geothermal watertoair heat pumps into the administrative and office areas and in the cafeteria/student lounge as those areas were more likely to be used throughout the year or during summer for events. The fresh air system was equipped with a geothermal watertowater heat pump to allow heating/cooling/dehumidification of fresh air supplied to all areas including classrooms and the gym. For the gym, a provision has been made to allow installation of cooling capacity in the system in the future by adding a waterwater heat pump to supply a coil. Natural ventilation is available for all classrooms and the gym using operable windows. The main central corridor is open on two stories and continues higher (almost three floors) to act as a natural chimney. All classrooms are opened to the central corridor (using operable panels). When the outside conditions are adequate, a special green light shows teachers/users it is a good day to use natural ventilation. Operable windows located at the top of the natural chimney are opened, and teachers/users can decide if they want to open them. If very hot days occur during the academic year, a provision for two propeller fans, located at each end of the main corridor, was planned (at the top of the natural chimney). This would force air movement through the building (using natural ventilation openings in classrooms but closing the windows at the top of the natural chimney). The same strategy was applied to the gym, allowing it to be naturally cooled. Also, a dedicated airhandling unit was installed into the gym for ventilation and heating purposes. Variable frequency drives were installed on each fan. Heat recovery was implemented on exhaust fans (washrooms, janitor rooms, etc). A centralized building automation system (BAS) links all mechanical ponents through a centralized DDC work. A central panel is located in the main mechanical room and is simple to use so that occupants who are present outside of normal business hours can start/stop different features of the building (natural ventilation, forced natural ventilation fans, primary fresh air system, gym ventilation syste