Measurements of Hybrid Ventilation Performance in an Office Building

This paper focuses on hybrid ventilation performance in an office building. It presents measurement results from the new headquarters of the company Bang & Olufsen, which served as one of the case study buildings in IEA ECBCS Annex 35. Ventilation and control strategy, as well as operational experience of the hybrid ventilation system is presented. Measurement results include long-term values of temperatures, CO2 and energy use for assisting fans and heating of ventilation air as well as electricity use for appliances. They include short term values of thermal comfort, temperature distribution in selected parts of the building, CO2 levels, and various tracer gas measurements for examining ventilation effectiveness, air and contaminant distribution, multizone internal air flows and air flows between the building and the outside environment. Results show an office environment with an acceptable thermal comfort level and a high level of IAQ, but with relatively high energy use for heating. The ventilation principle works well with high ventilation effectiveness when the system is operated