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In residential construction a large number of decentralized air handling units which work alternately in pairs and (thus also referred to as push/pull units) is used to serve the apartments. These ventilation systems ensure the exchange of air in residential buildings, while at the same time reducing ventilation heat losses. These air handling units...

Active thermography helps to evaluate existing components under realistic climate scenarios. The findings can be used, for instance, to evaluate the storage capacity, phase shifts etc. Active thermography, for instance, allows for realistic assessments of a building’s heat protection during summer time. It also allows for more accurate...

When measuring zero pressure for high-rises according to the ISO 9972 standard, it is normally not possible to meet its requirements where the absolute values Δp + and Δp- have to be kept at <5 Pa before and after the measurement. This presentation puts forward a proposal for a zero pressure measurement method that complements this...

This study is a part of a thesis work that aims to evaluate the error induced by the wind during building pressurization tests performed according to the ISO 9972 method on a reduced model in controlled laboratory conditions. In order to reproduce pressurization test, we have design and characterize a new experimental facility that...

How long do you have to wait after having adjusted the fan during an air permeability measurement until the pressure difference has practically reached its final value? Which parameters determine the required waiting time? he pressure difference on the building envelope as a function of time can be described by a differential equation...

An airtight design of the heat-transferring building envelope has become a standard requirement for new buildings. An n50-value of approximately 1 is now quite common for new buildings in Germany. Property developers and building contractors are thus all the more adamant that any notices of defect put forward in spite of such...

The German Energy Savings and Renewables Act (GEG) entered into force on November 1, 2020 and thus replaced the Energy Savings Ordinance. §26 of the Energy Savings and Renewables Act specifies that a building shall be checked for leaks "before it is finished". The same provision refers to the measurement standard DIN EN ISO 9972:2018...

We investigated whether leak detection methods from the building sector can be customized to find leaks in the paneling of an aircraft's cargo hold. Airtightness values of the cargo area are used as reference to determine how much extinguishing agent has to be carried during the flight. Our investigation customizes the BlowerDoor test method...

Air permeability measurements of buildings have become an acknowledged and established procedure that is now used in other areas as well, such as in rocket engineering. While developing the upper stage of the Ariane 6 rocket in Bremen, engineers have been searching for an easy and reproducible method to measure the airflow through...

For a number of years now, the Passive House Institute (PHI) has been granting certifications ("Passive House certified components") for the numerous special products that are already available on the market to render a building airtight. The PHI does not carry out material testing – it assesses solutions that are typically used in most...