Germany – Ventilation installation work – Ilmenau Schule Deutsch Evern

430 Ventilation Systems 431 Ventilation Systems The building will be equipped with a central ventilation system and designed as follows on a per-person basis:

· It is assumed that there will be 24 children and one teacher in the classrooms.

· It is estimated that there will be 400 people over 18 years of age for events. This results in a required air volume flow of 10,000 m³/h in the event of an event (including the auditorium).

· In the operating scenario of the lunch break, 150 children are taken into account with an approach of 25 m³/h per person. For this school operation, an air volume flow of 3,750 m³/h is assumed. To implement the mentioned operating scenarios (event and lunch break), variable volume flow controllers will be used in the main ducts to the classrooms. These allow the air volumes in the classrooms to be reduced, so that the resulting air volume flows can be made available to the canteen. All classrooms are operated with a base ventilation to ensure moisture protection. The central ventilation unit in the ventilation centre 2.01 attic has approx. 18,100 m³/h (dimensions approx. H/B/T 2.702/7.182/2.482 mm) for the entire building. The ventilation unit has a weight of approx. 4,686.00 kg. The entire school will be mechanically ventilated and exhausted. The mechanical ventilation and exhaust will be via air diffusers. Heat recovery will be via a heat exchanger integrated into the ventilation unit. The ventilation system will be operated with constant and variable volume flows. During operating hours, the ventilation unit will run at 100%, and outside of operating hours, the ventilation unit will be reduced according to the operator's wish. Most of the air distribution network is located in the suspended ceiling area and is routed from there to the air diffusers. The outside and exhaust air is routed directly from the ventilation centre via the roof. To avoid sound transmission, sound attenuators will be provided in the ventilation distribution network. Sound decoupling plates made of NR/SBR polymer will be used below the base frame of the ventilation unit. Fire dampers will be planned for the penetration of fire protection components. The outside and exhaust air duct will be insulated with diffusion-tight insulation. In addition, non-combustible mineral wool will be used over the diffusion-tight insulation of the outside and exhaust air duct. Kitchen Ventilation According to the kitchen planning, it is assumed that the concept of a "distribution kitchen" will be realised, in which the hot-delivered food of a catering company will be grouped and then distributed. Simple serving and tea trolleys will be used for distribution. The food will be delivered in so-called thermo-ports, for which only sufficient power supply (Electrical Trade) and sufficient standing areas are to be ensured. The equipment of the (distribution) kitchen will be with household appliances, so that the VDI 2052-1 for the design and dimensioning of the room ventilation technology in kitchens can be disregarded. Essentially, this distribution kitchen is a combination of a commercial kitchen and a domestic kitchen. This was also the principle for the dimensioning of the ventilation unit. For the design of the ventilation unit, reference values for the standard ventilation rates and guidelines of the VDI 2082 for handling open foodstuffs were used. The average air volume flow of approx. 550 m³/h ensures a seven- to eight-fold air change per hour with a room volume of approx. 73 m³. This value is within the framework of the recognised rules of the art, in particular according to the relevant DIN standards for non-residential buildings (e.g. DIN 18017-3) and the VDI guidelines (e.g. VDI 6022 for ventilation systems).