Natural ventilation: How to organize the flow of air
How to organize the flow of air into the house?
How to organize the flow of air
Despite all its shortcomings, the old wooden windows somehow provided an influx of fresh air and even through and corner ventilation of the apartment (provided that all the windows are not located on the same facade of the house). Modern double-glazed windows hold heat much better and protect against street noise, but they are not suitable for unorganized natural ventilation.
The breathability of new plastic windows usually does not exceed 6 kg / h • sq. m. Simply put, the flow of air is almost shut off. You can restore it in three ways: manual, automatic ventilation and the organization of a constant flow of fresh air. Let’s consider them in more detail.
Regular manual airing
You can set the window sash in the appropriate position, or you can use volley airing when the window opens completely for 10 or more minutes, depending on the season. Alas, there is often no time to do this. Yes, and such a ventilation process is suitable only for houses with high heat capacity since a “volley” of cold air coming from the street should quickly heat up against walls and ceilings. In frame houses, this will not work. The mass of their structures is small, and they are filled with insulation, which does not conduct heat (for which it is appreciated) and does not accumulate it. As a result, the cold air that got through the window into the “thermos” does not warm up for a long time, and the residents feel discomfort.
Regular automatic ventilation
All the same as in the previous case, but with the help of special devices that open and close the casement windows mechanically, thanks to the built-in electric drive. This happens at the command of a timer or controller or when a button is pressed. These devices are called mechanical automatic ventilators.
Automatic ventilators come with chain, rack or spindle drives. Particularly compact devices are installed in place of the window handle.
Organization of a constant influx of fresh air
Here we are talking about the supply devices – valves – which are built into the window or crash into the wall. Such devices come in several types: built-in window valves, overhead devices, and wall valves.
Such ventilators are installed in the opening of the window unit between the sash and the frame. The manufacturers of window profiles themselves usually produce them: KBE, Trocal, Salamander, KÖMERLING, etc. Such valves are similar only externally — each company adapts them to its windows, so there is no question of interchangeability.
The principle of operation of devices of this group is based on the difference in pressure outside and inside the building arising from the wind or the operation of the natural exhaust ventilation system. The valves are a rectangular plastic box, which is fixed with screws to the window frame or “snap” into the seal groove. Inside the box, there is an element called a “petal” or “feather”, which blocks the passing airflow during strong gusts of wind.
The air inlet can be located opposite the box (to install it, the sealing profile is removed), and at some distance from it, which in winter allows the incoming street air to warm up.
With a small pressure difference between the street and the room (about 10 Pa), one device is able to let 5-6 cubic meters of air per hour into the room, so manufacturers recommend installing not one valve in the window, but two (in different flaps) to increase the flow. A plus of such devices – their installation does not make irreversible changes to the window design – if desired, all seals can be returned to their place. The downside is low productivity. Therefore, before ordering the built-in valves, you must accurately calculate their capabilities and compare with your needs. If the installation of even several valves in one window does not provide the desired flow, it is better to choose overhead or wall-mounted inlet devices.