English

Airtightness is mandatory, as are ventilation concepts. Today, the construction/renovation of a building without a ventilation system is impractical in terms of energy efficiency. The minimum air change rate and moisture protection should not be neglected either. According to my experience as an expert in this field, more than 75 %percent of all ventilation systems have significant design faults and maladjustments, leading to significant energy losses.

Purpose of the work 
Windows are positioned / adjusted before occupants moving into a building. Their settings may change due to their daily use and mechanical or other impacts during their service life. A window service readjusts the windows. 
The project investigates potential savings in terms of air infiltration and energy savings as such. The investigation is carried out in single-family dwellings and condominiums. 20 dwellings will be measured during the project. 

Method of approach 

Purpose of the work 
Poor air quality in classrooms is a well-known problem. Achieving good air quality with window ventilation during the cold season requires a great deal of attention and time to the detriment of school lessons. Delivering appropriate air exchange rates for classrooms is only possible by sacrificing some thermal comfort. When replacing school windows, one should take a critical look at the typical window ventilation strategy and come up with better solutions. 

Purpose of the work 

Purpose of the work 

In Denmark, a manufacturer and dealer of vapor barrier membranes has observed unusual behavior. The membranes were installed in a small house and show that the system can be set up and be tight. What is interesting is that the airleak range changes over time, and becomes approx. twice as leaky over two months, but then the curve also flattens out, and becomes fixed. 
The observation will be presented, and the presentation is an invitation that others might want to do more research into this. 

Purpose of the work  
To which extent do leaky exhaust air dampers in extractor systems impact energy-efficient buildings?  
To which extent do such dampers influence Blower Door tests? 

Method of approach 
Measurements at the test stand and calculation 

We all know that the airtight or sufficiently air-impermeable (which is the physically correct term) building design is state-of-the-art, i.e., complies with the “Recognized and Generally Accepted Good Engineering Practices”. It is relatively easy to achieve a sufficiently air-impermeable design for new buildings when ensuring that it is carefully planned and executed and that the design is quality-controlled.  

This presentation is the recording of the first 100 airtight tests in Greece, from 2010 until today. The inspections were carried out in private homes and in large-scale commercial buildings, of different construction dates, renovated or not, in various cities of the country and on islands. Most of the inspections were carried out in the area of Attica and in the city of Athens.

Aside from amending terms and definitions, the purpose of the national Annex NA is to introduce “Procedure 3”. The annex has the purpose to ensure that the measuring method is feasible in Switzerland and that the airtightness quality in buildings is good. The building preparation, for instance, is slightly different compared to the previous method. There is a tendency to tape off fewer components to promote good workmanship.