Auctchion Fredericton Nb

building component / cool ceiling

In our latitude will be eight to nine months to be heated. A large part of the building, CO2 emissions can be reduced by improved insulation. by an increased tightness of windows and building envelope expected to lead to a further reduction of emissions, as tighter building cool less quickly and therefore need to be heated less.

The buildings, however, to have such a high density that a little more comfort ventilation is not required. The Natural Air exchange is absent. building being built in the humidity. Produced This is the man himself, by the use as cooking or even from a drying building components such as concrete, masonry and substrates, etc. This inevitably accumulating moisture must be removed because you can no longer escape through weak spots in the building envelope. I would like to note that I do not think that a leaky building envelope would be useful. The ausdringende, moist air would inevitably meet in the design to cold areas, which results in condensate. On the resulting damage patterns I would not go into at this point. Walls, Floors and ceilings should absorb moisture for a short time and can deliver quickly. Plastic containing Sperrschichen such as emulsion paints are not porous and therefore can not contribute moisture. The building envelope should be used, and even today, are still tight. To avoid humidity and is therefore an air supply from outside guarantee. This is by manual ventilation by automatic openings are controlled by a timer or humidity, or made possible by a ventilation system with supply air and exhaust air. When necessary for the operation of the ventilation of electrical energy production, is also CO2 ejected. This fact is often overlooked generous.

was used, in contrast to today, often objected to a too low humidity. This was on the high air exchange through leaks in the windows. Circumferential seals when the windows were still an issue. The air exchange was therefore held between the sash and frame. The envelope was then, as now sealed.

In search for suitable alternatives to the ventilation system, so the opportunities for ventilation and no additional or reduced environmental impact, I came across the following options:

As mentioned above, there is the possibility of natural Ventilation. The successful ventilation is dependent on the reliability of the inhabitants - and thus unusable. With the automatic ventilation repealed this factor. This however, needs an electric drive, control and measurement function.

Both systems have the disadvantage that pre-tempered outside air into the room flow and therefore increases the heating demand.

The "air V1" Swiss system of Windows, the manufacturers have not tried to combine motorized and automatic ventilation. It was a self-regulating system.

System description of the manufacturer: the invisible folding fan air V1 is ideal for a controlled exchange of air. The fed from the outside fresh air rises due to pressure difference between the wing and the frame up by the fan into the interior of the room. The louvers are equipped with various counter-weights, so that the individual fans react according to wind speeds. Drafts do not occur, as appropriate uses for wind pressure of the control mechanism.
The incoming cold supply air is heated and rises. The fresh warmed Air enters at the open louvers in the room. The folding fan has an airflow limitation with two-stage scheme. The adjustment is done by two A-weighted individual modules with different control panels for different wind load areas. With stronger wind speeds to regulate the fan flap (red) is automatically the incoming air, can occur so that no Zuserscheinungen. Decreases the wind speed is open, the louvers automatically for new fresh air.

For this system, the Lufwechsel (about 6 m3 / h), compared to other systems is limited. The required heating the air outside I put something in question.
Similar systems with direct air inlet over the frame portion can be coupled with an exhaust system. This application is used primarily for conversions, because the supply of technical and structural reasons can be brought into the living rooms and bedrooms. It was there then the air vents are installed over the windows. be replaced during renovations in the window (without vents) and the building so dense, creating the kitchen or Badabluft a negative pressure in the rooms. This negative pressure must be compensated somehow. This is done in places where it is still just as possible under the front door which may in the window restoration was not renewed and therefore has a lower density. Pfeiffgeräusche and smells of the surrounding area are the result of this pressure compensation. contribute to To address this problem, the window manufacturer, a new Flügelkippstellung these windows are installed. The window remains open to a very small gap to allow the subsequent flow of fresh air. In the end just the same as an air inlet above the window. For residential buildings is a controlled air exchange in the form of a ventilation system for the achievement of Minenergiestandards, condition.
During the renovation, can at sites of the sensitivity level I or II of the Noise Control Ordinance, with automatic Ventilation openings to work.

Nachströmungsöffnungen Non-automated for the Minenergiestandart, both in new construction, as allowed with modifications not. For
exaggerate these Nachströmungsöffnungen nothing but leaky components. According to the rules and methods of verification is to award the MINERGIE labels for windows in residential high density of the window is essential.

Conclusion: exterior walls always have to be airtight. Due to the technical improvement of the windows, the buildings were indeed energy efficient, but also dense and the air exchange does not take place. A ventilation is now necessary. Alternatives for controlled ventilation systems are now only limited use, because the current standard (MINERGIE) are natural Nachströmungsöffnungen, which many systems are based, not permissible. For conversions, possibly with automatic window control mechanisms are allowed.
Jan Sanders Mayr

Sources:

- SIA 180, heat and moisture
- HR Preisig, M. Zumoberhaus: Air permeability of building envelope
- Swiss Association of window and facade industry FFF

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www.swisswindows.ch


- Rules and detection procedures for the award of MINERGIE labels for windows in residential construction.