Energy efficient refurbishment was a central aspect when the German federal government released funds for the Konjunkturpaket II (economic stimulus package). The Franziska-Hager primary, secondary and special school on the Chiemsee is now benefiting from this stimulus package. In three construction phases, the schools will undergo energetic modernisation measures. A central component here is the decentralised ventilation solution from TROX with Type TROX SCHOOLAIR-D and SCHOOLAIR-B air handling units.

These decentralised ventilation and air conditioning systems are perfectly suited to the special requirements of schools.

Classrooms place high demands on supply and extract ventilation. They are sometimes used intensively by up to 30 people. Each person usually needs a fresh air flow rate of 15 to 20 m3/h. The overall volume flow rate can thus be between 300 and 600 m3/h depending on the number of people in the room. To realise optimum air distribution, the supply air should be introduced to the room from at least two different points. Thanks to the integrated heat exchanger unit, the devices are efficiently supplied with water as the energy transfer medium. Decentralised ventilation systems are very flexible. They can be regulated for individual rooms, thus minimising operating costs.

Via two openings in the external walls, the three air handling units that have now been installed, TROX SCHOOLAIR-B and SCHOOLAIR-D, exchange up to a maximum of 960 cubic metres of air per hour in the classrooms. The air is heated on a needs-driven basis. In addition, the units work at very low noise levels (at 250m³/h sound pressure level of 31dB(A) with 8dB room sound absorption). The units are equipped with automatic room control, which regulates the ventilation phases depending on the CO2 concentration. The air handling units are installed on the outer facade, in the sill area, or directly near the lintel area under the ceiling. The automated ventilation with sound absorption, integrated heat recovery and energy-efficient EC-radial flow offers optimum room comfort thanks to its additional heat exchanger unit for heating.

For the students of the Franziska-Hager school, the refurbishment means a better "learning climate", better performance and a more relaxed school day.

TROX SCHOOLAIR-D installed in a classroom of the Franziska-Hager school	TROX SCHOOLAIR-D is installed under the ceiling directly near the lintel area on the outer facade.

Installation situation of TROX SCHOOLAIR-B in a classroom of the Franziska-Hager school	TROX SCHOOLAIR-B is installed horzontally in front of the sill.