Demand-controlled air ventilation strategies and heat transfer in building automation

Abstract

Improving building standards and facility services in residential buildings is one major effort for future energy savings. Due to current facility standards and tightened legal restrictions, automated air ventilation (AVS) can contribute large potentials towards energy consumption downsizing. Current legal efforts (EnEV) enforce facility services to maintain high indoor air quality (IAQ) without natural air ventilation possibilieties, such as gap ventilation (Paessler, 2010). Aiming at heat loss avoidance in residential buildings, heat loads in different ventilation zones are used for heat transfer via AVS with heat recovery components.Therefor, the required ventilation stategy distinguishes supply and extract air zones and highlights local heat utilization. In this paper the effort of transferring heat from intermediate high temperature level zones (IHTLin extract air zones), such as bathrooms and kitchens into long term medium temperature level zones (LMTL in supply air zones) by using air ventilation systems with heat recovery is presented. Multiple control variables (air quality, humidity, temperature and presense information) are presented as demand indicators fir indoor air quality. Furthermore, the building automation infrastructure for sensoring and processing IAQas well as thermal utilisation is introduced.