Dilution ventilation in the conservatory - you should know

Every winter garden has to be adequately ventilated, otherwise an atmosphere like in an aquarium will be formed within a very short time and the oxygen content of the air will decrease. How the principle of dilution ventilation works, and what advantages and disadvantages it has over the alternatives, you can read here.

How the dilution ventilation works

For aeration, one can make a fundamental distinction between displacement ventilation and dilution ventilation.

displacement ventilation

As the name suggests, the displacement ventilation displaces and pushes out all the air in the room. The supplied fresh air displaces the room air as a whole.

The displacement ventilation can be designed as one

  • ceiling ventilation
  • cross ventilation
  • Floor ventilation or
  • so-called source ventilation, which always guarantees the best air supply locally

Displacement ventilation is also more energy efficient than dilution ventilation, but at the same time it is many times more effective.

dilution ventilation

With dilution ventilation, the existing room air is merely diluted by the fresh air. In stock Contaminants are not completely disposed of, only reduced.

The air is blown into the room from a single point during dilution ventilation at 2 to 5 m / s injection rates.

Depending on the size of the room, this results in a high power consumption, but it comes to an effective ventilation of all areas of the room, and not only the Aufenthaltsvbereiche. The so-called flow rollers within the room ensure good mixing.

Alternative ventilation forms

Natural ventilation

The so-called natural ventilation is the most frequently used ventilation form for conservatories. Cold air flows from the ventilation slots near the floor into the conservatory, the warm (used up) air rises and escapes through flaps in the roof.

It is therefore a kind of displacement ventilation. However, sufficiently large supply and exhaust openings are required (at least 30 percent of the floor space). This must be taken care of during the planning.

The larger the temperature difference between the supply and exhaust air, the better the ventilation works. It does not need additional energy, but the ventilation flaps must be controlled accordingly (possibly automatically).

Ventilation devices for dilution ventilation

Ventilation devices that work automatically move the air selectively with a fan. Here, a temperature- and humidity-controlled complete systems can bring another additional advantage:

  • At high air exchange rates, it automatically leads to a very good ventilation of the conservatory
  • The waste heat from the winter garden can be fed into the core house, where it reduces the heating costs, in some cases significantly
  • Dehumidification of the conservatory and humidification of the house also happen automatically

injection velocity

The blowing speed must be adjusted exactly. It must mix as effectively as possible with the room air.

For a climate- or temperature-compensating function, there is something else to keep in mind: It is absolutely necessary to coordinate over different temperature ranges. Warm air is much lighter than cold air and therefore needs to be pushed with greater energy into the interior of the conservatory.

In contrast, cold air in cooling mode is very heavy and reaches high speeds as it flows down from the ceiling.

Excessively high injection speeds also increase the sound level; when the cold air entering at high speeds, a noticeable breeze is perceived, which is often perceived as unpleasant.

All these factors have to be taken into account when planning the conservatory.

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