Education & Institutions
In a new extension to Hadbjerg School in Denmark, which consists of 15 classrooms and one common area, hybrid ventilation in classrooms and natural ventilation in the common area was chosen.
The possibility to have a ventilation solution completely without large ducts and a very limited tech room contributed to the fact that hybrid ventilation and natural ventilation were chosen as the ideal solutions.
In classrooms, the natural ventilation is based on single sided ventilation, while in the common area it consists of stack ventilation.
In addition to natural ventilation, mechanical ventilation has been established in the classrooms in the form of facade-mounted decentralized ventilation units with heat recovery.
The hybrid ventilation solution has a very low energy consumption, seeing as the energy efficient natural ventilation can be used most of the year with the mechanical ventilation units with heat recovery assisting during the winter.
The common area's energy consumption is also kept to a minimum, as a high air change rate can be achieved throughout the entire summer without mechanical ventilation. This compensates for the lack of heat recovery in the winter.
The amount of ventilation and the ventilation principles are based on local weather data as well as the desired levels of room temperature and CO2 level in the individual areas.
In each room, a panel is installed for manual override of the automation. This allows students and teachers to change the position of the window if more or less fresh air is desired. After 30 minutes, the system goes back to automatic operation.
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