Thursday, April 16, 2009

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challenge: controlled ventilation in Minergie rehabilitation

Background:


did two months ago I completed a Minergie renovation of a terraced house in the 70s. The building consists of a bottom, an earth- and a penthouse, with about 340 m3 heated volume.

The final acceptance is the builder noted that the air is for the rehabilitation, respectively, since the commissioning of the ventilation become unpleasantly dry and the ventilation noise to the level 2, getting to sleep but also getting used to be.

The phenomenon of the drier air with a controlled ventilation is a known side effect, but are nevertheless checked whether a defect exists or not.

The same goes for the second point of criticism, to the loud air intake noise.



action and learning:


One of the advantages of controlled ventilation is already known, it can be controlled and therefore adjusted.

Although we Lüftungsverteilrohre for the installation of the plastic pipes with a diameter of 90 mm chosen instead of 75 mm, so as to reduce the flow rate, were on the 2nd Fan stage noise is disturbing to hear, above all, of course, to sleep. From the ventilation system (Drexel and Weiss, Aero Silent classic) itself, which was built next to the master bedroom into a closet, thanks to all measures taken, nothing listen. Have proved here that separated the existing floor, the ventilation unit with rubber bases off the ground is not in the mufflers saved was (rectangular silencer 160/200 by Böni + Co AG, instead of the planned Wester Silent round mufflers ø 160 mm). The carpenter from the inside ausgedämte cabinet insulates the already quiet machine even more.

This does show the positive aspects and experiences, but still not solve our problems. The second ventilation stage is asleep to the right in principle because of the increased air needs to be covered. So we thought about either the ventilation performance to reduce the second stage of 160 m3 / h to 140 m3 / h or during the asleep period, the ventilation to remain on level one, at 112 m3 / h and switch after an hour on the higher level.

latter variant has been found after a trial period of one week as the right thing in this case and that because a reduction in the second stage does reduce the noise, but also the increased air requirements fulfilled only to a limited extent. The delayed switching to the second stage, however, has even less noise than the reduced variant asleep during the sensitive and the result will then meet on the night and the increased air requirements.


The second challenge was, or better the air is too dry. Basically, we want to give up an "artificial" or active humidification with a humidifier.

The humidity was measured by the technician on several days and at different times and in the lowest case to 20% relative humidity and set on average at 30% relative humidity.

These values are well known in tolorierbaren area, but if it is unpleasant to the builders have to find a solution yet, of course.

As the house practically all day because all work is empty, of course, missing the biggest "Humidifier" in the house. But now the man to replace (in this case 4 adults) with light activity about 30 - 60g releases of water per hour to the environment, but would have about 8 medium-sized rubber trees or 5 tanks to be brought inside.

Since this non-referred to the builder, we try it now with 3 - 4 pot plants and are in no noticeable improvement, as a next step, the first stage of the air to about 100 m3 / h reduce the air exchange to slow during the day if the house is empty.


whether these measures achieve the desired effect remains to be seen in the near future.



sources:


- Main source: experience locally on site;


- Brochure Optimal ventilation, from Switzerland. Association of window and facade industry

4th Edition Sept. 2002;


- heating, ventilation, electricity, energy in the building, Christoph Schmid,

third Edition 2005;


- Homepage of Minergy, www.minergie.ch;


- Homepage of Drexel and Weiss, www.drexel-weiss.at.



Reto Wolf, an architecture student HSZ-T, class A06B, 16.04.2009

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