Air exchange rate - the ratio between the volume of air entering the room and the volume of the room.It is usually measured in 1 / h.In other words, this figure shows how many times per unit of time in the room is completely replaced by air.
Why is this necessary?The fact is that the purity of the air in the room is influenced by many factors, it is the presence of people or animals, and the number of working equipment, and for industrial buildings - and the presence of noxious fumes or other harmful factors.Therefore, if the air is polluted, it needs to be changed.Number of air determines how many times and for how long, usually hours or less, the daily period, replaced by air.There is also a concept - the vent volume that shows no correlation, and a number of cubic meters of air passing through the space per unit time.Both of these quantities are interdependent, but it is more likely to use air exchange.
The most important use of it is in the building - namely the design of a variety of buildings and structures.Systems of supply and exhaust ventilation are developed solely on the basis of this value.To designers peretruzhdaetsya not make payments ventilation.There are special regulations, which clearly state what should be the number of air changes in the room, depending on its purpose.They painted everything canteens, nurseries, restaurants, factories, ships, and even on separate premises, kitchen, bedroom, etc.Engineers take the ready figure on the basis of its developing ventilation system.
There are supply and exhaust systems, to provide the basic necessary volume of exhaust air is considered.Pritochkoy often neglected in general, believing that air enters through leakages of constructions, windows, doors, cracks in the floor.Air can not come more than was needed, or vice versa, so ventilation volume balance must be maintained between them.Especially this question is actual, when taken into account the multiplicity of air in industrial premises.By virtue of their size and large quantities of multiplicity, industrial buildings require a more careful approach to the development of the ventilation system.When the number of air from five to ten volumes per hour, it is impossible to manage natural looseness.Here come into play the powerful intake system with a mechanical drive, local exhaust, combined regenerative system ...
Number of air, which is an important figure in the building, in the home as their practical application finds.If we are stuffy, we are opening a window, if it's cold, it warms.But there is little nuance.Modern plastic windows and doors as a sealed structure, substantially reduce the inflow and reduce the quality of the air in your home.The author in conducting energy audits repeatedly ever watch as kindergartens after quiet hours in mid-winter window wide open in order to ventilate the room, for a terrible stuffiness.To avoid this from happening, you need to put a window or with special adjustable slits, or near a window in the wall to install a small heat exchanger.
