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At the beginning of 2019 I received a request to measure four so-called isolation rooms which were intended for a new hospital. Such isolation rooms are standard practice to prevent the transmission of germs and viruses from patients with contagious diseases or to patients suffering from immunodeficiency. It depends on each situation...

In an air traffic control tower (ATCT), conditions for thermal comfort are crucial as the task of air traffic control requires high level of attention and vigilance. Despite its high glazing rate exposed to sunny and windy conditions, comfortable conditions (temperature, IAQ, air velocity on control positions) must be guaranteed all the time especially...

Currently, the standards committee is working on the next amendment of DIN 4108-3. It is intended to extend the list with different variants of retrofitted existing roofs meeting heat and moisture related requirements without having to submit proof thereof. These variants already include a vapor barrier that is “retrofitted in loops”. The airtight...

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...