Controlled Airflow through an Envelope Principles of Natural Ventilation

4 Controlled Airflow through an Envelope Principles of Natural Ventilation [Pg.587]

Natural ventilation is the controlled flow of air through doors, windows, vents, and other purposely provided openings caused by stack effect and wind pressure. Natural ventilation is used in spaces with a significant heat release, when process and hygienic requirements for indoor air quality allow outdoor air supply without filtration and treatment. Natural ventilation cannot be used when incoming outdoor air causes mist or condensation. Natural ventilation allows significant air change rates (20 to 50 ach) for heat removal with ntinimal operation costs. [Pg.587]

Airflow through an opening used for natural building ventilation is approximately turbulent. In this case the flow rate, Q (m /s), can be calculated from an equation similar to Eq. (7.237) [Pg.587]

CHAPTER 7 PRINCIPLES OE AIR AND CONTAMINANT MOVEMENT INSIDE AND AROUND BUILDINGS [Pg.588]

a AIR MOVEMENT AROUND BUILDINGS AND THROUGH A BUILDING ENVELOPE [Pg.589]

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