air change rates

We present a study of natural ventilation design during the early (conceptual) stage of a building's design, based on a field study in a naturally ventilated office in California where we collected data on occupants' window use, local weather conditions, indoor environmental conditions, and air change rates based on tracer-gas decay. We performed uncertainty and sensitivity analyses to determine which design parameters have most impact on the uncertainty associated with ventilation performance predictions.

Natural ventilation is a commonly used principle when ventilation systems for buildings are designed.The ventilation can either be obtained by automatically controlled openings in the building envelope, orit can just be the simple action of opening a door or a window to let the fresh air in.

The purpose of this study is to determine how levels of ventilation rates and indoor air quality vary in elementary schools in southern Japan. This study is based on field monitoring carried out as intermittent monitoring from summer to winter. The concentrations of Volatile Organic Compounds (VOCs) and the air exchange rates were measured in four classrooms in Kagoshima City. The measurements also included carbon dioxide (CO2) in a selected classroom with occupancy of the pupils.

The multi-storey blocks which constitute the main type of building in Greek urban environments, have certain common characteristics. Those characteristics include the overall building dimensions and geometry, internal room dimensions, the materials used both in building construction and insulation, the size and the arrangement of the openings on the facades, the arrangement of the balconies, the position and dimension of the staircase etc.