Natural ventilation


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Related to Natural ventilation: cross 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 ventilation

1. 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 systems

natural ventilation

Ventilation by air movement caused by natural forces, rather than by fans.
References in periodicals archive ?
A Study on a thermal load simulation method for spaces conditioned by heating, cooling and fresh air control systems combined with natural ventilation. 2017.
From 09h30 to 17h00, sows under cooled ventilation presented lower respiratory rate compared to those under natural ventilation.
We analyzed the criteria for outdoor conditions for operating natural ventilation openings.
Caption: FIGURE 1A (TOP) AND IB (BOTTOM) Integrated design approach led to optimal window placement and sizing for maximizing benefits of natural daylighting and natural ventilation.
While emergency functionality was a significant consideration for Royal Jubilee's PCC, a LEED Gold-certified medical, surgical, and mental health inpatient facility designed by CannonDesign (former Vancouver, British Columbia, office), the primary goal in incorporating natural ventilation was to create a more patient-centric environment, says David Leadbetter, Royal Jubilee's director of special projects.
Hence, more explorations should be conducted to preserve the aesthetic heritage of the wood carving panels, which at the same time provides effective natural ventilation.
Figure 6 shows the behavior of the variable relative humidity inside the solar dryer of coffee; this variable shows the same trend as the temperature, i.e., it is inversely proportional to the area of natural ventilation. The fully enclosed environment (unventilated) during most of the time showed 100% relative humidity (saturated); in this closed environment, the relative humidity decreased when the solar dryer was opened to stir the coffee.
The design was entirely randomized (ERD), consisting of a 2x3 factorial experiment with two micropropagation systems (conventional and natural ventilation) and three types of medium (liquid, solid with 5 and 6g [L.sup.-1] of agar), and two additional treatments of micropropagation in bioreactors (continuous and temporary immersion), totaling 8 treatments with three repetitions.
Using natural ventilation in buildings offers additional benefits besides energy usage reductions.
His topics include physical processes in natural ventilation, steady and unsteady envelope flow models, contaminant transport and indoor air quality, computational fluid dynamics and its applications, full-scale measurements, and design procedures.
Residents of Italy used their knowledge of natural ventilation techniques to cool summer villas and palaces built between the 16th and 18th centuries.
The 15-storey extension to the KfW banking group headquarters in Frankfurt will complete an ensemble of buildings from the 70s, '80s and '90s.The building will have a double-layered wind-pressurised facade that allows natural ventilation in all weather conditions.