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DictionarySeenaturalNatural ventilation
natural ventilation[′nach·rəl ‚vent·əl′ā·shən] (mining engineering) The weak and varying ventilation in a mine caused by the difference in air density between shafts. Natural ventilation1. A method for reducing energy use and cost and for providing acceptable indoor environmental quality rather than using mechanical ventilation. Natural ventilation systems rely on pressure differences to move fresh air through buildings. Openings between rooms such as transom windows, louvers, grills, or open plans are techniques to complete the airflow circuit through a building. Strategies include placement and operability of windows and doors, thermal chimneys, operable skylights, and exterior landscaped berms to direct airflow on a site.2. A method that uses operable windows and direct outside air circulation, when the temperature, wind, precipitation, humidity, and pollution levels are acceptable. The amount of natural ventilation depends on the type, shape, placement, and size of the building and its openings. There are two primary natural ventilation methods: cross-ventilation and stack-ventilation. Cross-ventilation depends on wind-driven breezes, whereas stack-ventilation uses air density differences to create air movement across a building. See also: Ventilation systemsnatural ventilationVentilation by air movement caused by natural forces, rather than by fans.FinancialSeeNatural |