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Displacement ventilation systems supply air directly to the occupied zone.The air is supplied at low velocities to cause minimal induction and mixing. This system is used for ventilation and cooling of large high spaces, such as auditorium and atria, where energy may be saved if only the occupied zone is treated rather than trying to control the conditions in the entire space.
The velocity of air through a register is usually kept low enough so that it is masked by background noise. (Higher ambient levels of background noise, such as those in restaurants, allow higher air velocities.) On the other hand, air velocity must be high enough to achieve the desired temperature. [6] Registers are a critical part of the HVAC ...
Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). [2] Standard mixing ventilation may be better suited for smaller spaces where air quality is not as great a concern, such as single-occupant offices, and where the room height is not tall (e.g., lower than 2.3 meters [7.5 feet]).
1973 Ford L600 box truck Ford L9000 Fire tank truck 1981 Ford LTS 9000 concrete mixer. For 1970, the L-series was introduced in four size ranges and two hood lengths and grille styles, and with single or tandem (denoted by the "T" in the model designation) rear axles. Powertrains included a wide range of gasoline and diesel engines, based on GVWR.
A High-volume low-speed fan. A high-volume low-speed (HVLS) fan is a type of mechanical fan greater than 7 feet (2.1 m) in diameter. [1] HVLS fans are generally ceiling fans although some are pole mounted. HVLS fans move slowly and distribute large amounts of air at low rotational speed– hence the name "high volume, low speed."
A bypass fume hood. The grille for the bypass chamber is visible at the top. Bypass CAV hoods were developed to overcome the high velocity issues that affect conventional fume hoods. [37] These hood allows air to be pulled through a "bypass" opening from above as the sash closes.
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To create low-velocity air movement in the occupied portion of room Accomplish the above while producing the minimum amount of noise When possible, dampers, extractors, and other flow control devices should not be placed near diffusers' inlets (necks), either not being used at all or being placed far upstream.
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