German

The actual question is as follows: “Is the building envelope of the first passive house in China sufficiently airtight?” To determine air-tightness in China, a pressure differential test was to be conducted. First, a number of questions had to be answered. What building system is used and which materials are implemented? Who will conduct the measurement, according to which standard will it be conducted, and how will the measuring equipment be transported to the site? What are the customs regulations to be observed and what kind of problems could the authorities in the area pose?

The new Part 7 of the Thermal Insulation Standard DIN 4108 describes the permanent design of the airtight layer of heated or air-conditioned buildings. In the chapter on requirements, some terms have been redefined. However, the required values for the maximum air change rate are stipulated in the current EnEV (German Regulation on Energy Conservation). The planning chapter features many new sections concerning the planning task as well as some additional schematic diagrams. The materials chapter deals with the suitability and implementation of joints and connections.

To describe the quality of adhesive joints and connections for airtight layers, our research includes comprehensive investigations into the effect of different working conditions and accelerated aging.

Today, labels introduced in some countries to certify standardised low energy buildings, such as ‘Passive House’ in Germany and ‘Minenergie’ in Switzerland, are becoming increasingly applied in Europe.  Both labels explicitly require a threshold level of airtightness (0.6 air changes per hour (ACH) at 50 Pa). For timber frame passive houses in Belgium, this requirement is commonly achieved by sealing all the joints in the interior structural sheathing, mostly consisting of Oriented Strand Boards (OSB).

The air tightness of building has been a serious problem over the last 30 years. In 1979 the international Air Infiltration Centre (AIC) was erected within the International Energy Agency (IEA) platform. Infiltration of cold air into buildings needs to be heated to reach to a comfortable indoor climate. But the energy penalty due to that should be minimized. The AIC (later AIVC) had as one of their tasks to find solutions for good air tight buildings and to promote the knowledge about building construction to reach acceptable level of air tightness of buildings.

We have developed a simple model to estimate ductwork leakage and heat conduction losses in steady-state conditions for a balanced ventilation system. Implemented in a spreadsheet, it allows us to calculate their impact on heat recovery efficiency consistently with EN 15241 without the need for a dynamic simulation tool. One case study shows that the global heat recovery of a balanced ventilation system with a nominal heat recovery of 80% can be reduced to less than 50% if the ductwork leakage and thermal resistance are poor.

The glossary gives the translation (English/German - German/English) of more than 1000 terms related to air infiltration and ventilation.

This document is intended for use as a supplement to AIRGLOSS (AIVC TN 5). All terms in AIRGLOSS are included together with some supplementary materials for which definition was considered superfluous.

If you are asked now about us fully enumerate those standards that we would have to consider if we wanted to start building a house tomorrow, no one would probably report - and this despite the fact attend this conference loud construction experts.

Niedrigenergiehäuser bis zum Passivhaus-Niveau setzen sich langsam auch in Tschechien durch, was natürlich mit passenden Lüftungsstrategien verbunden ist. Der Beitrag präsentiert die am häufigsten benutzten technischen Systeme und diskutiert derer Eigenschaften und Akzeptanz. Die Anzahl der gebauten Niedrigstenergiehäuser in Tschechien ist zwar tendenziell steigend, die absoluten Zahlen sind immer noch sehr niedrig. Es sind noch mehrere Barrieren zu überwinden, wobei die technischen Fragen nur einen Teil darstellen.
 

Das Wissen, wie Bauteilanschlüsse luftdicht hergestellt werden, ist inzwischen relativ verbreitet – zumindest unter den interessierten Bauschaffenden. Bei Luftdichtheitsprüfungen mit der Blower door findet man aber immer wieder Öffnungen, von denen gesagt wird, sie seien aus technischen Gründen notwendig. An zwei Beispielen soll gezeigt werden, dass oft auch Lösungen ohne eine Öffnung in der luftdichten Gebäudehülle möglich sind: Bei den Schornsteinen bietet der Markt inzwischen auch Modelle ohne Hinterlüftung an. Das Luftdichtheitsproblem ist damit gelöst.