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SWEGON AB Indoor Climate Systems 2004 - Air distribution products - Rev. 5 June. 2007
www.swegon.comThe purpose of ventilation
General
Ventilation is used for different purposes. Its principal purpose is to exchange contaminated air with clean and tempered air. It can be said that contaminated air is air which is too warm and which contains gases and dirt particles.
It is also important to create a room climate without draught problems and only slight temperature changes in the occupied zone. Room climate depends on several factors, including air velocity, air temperature and radiant temperature. When people occupy rooms, significant changes in any of these factors can cause draught problems.
In order to maintain these basic functions, the air conditioning
system should be:
- sufficiently stable to resist disturbance. External disturbances could be wind and temperature; internal disturbances could be convection currents from heat sources. To provide stability against external disturbances the system must be designed with a certain pressure drop.
- easy to check and measure. The system must be designed for either fixed measurement outlet diffusers or fixed measurement units in main and manifold ducts. Measurement diffusers of these types considerably decrease the time taken for commissioning and thereby reduce the total cost of installation.
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