Control of Hybrid Ventilation Systems

The paper presents examples of hybrid ventilation and control strategies in office and educational buildings from the IEA ECBCS Annex 35 HybVent case studies. The purpose is to extract the lessons learned in the case studies about the control strategy used. The conclusions are that in each building project the control strategy has to be carefully designed and operated, not only in relation to the general building design and the ventilation systems in the building, but also in relation to occupants habits, reactions and expectations to indoor climate and comfort. In general it is relatively easy to design a suitable control strategy for hybrid ventilated cellular offices. In landscape offices and educational buildings it is more problematic, especially with regard to the automatic central control of windows.