English

Air cleaning has been considered an alternative method of improving indoor air quality and, in some cases, as a supplement to ventilation. The need for energy reduction to reduce the emission of CO2 into the atmosphere and subsequently combat the consequences of climate change has brought air cleaning into focus in recent years.

By 2050, the entire built environment must be climate neutral. Before that final date, we have to find an alternative to the use of fossil energy in the built environment. The switch to a climate neutral built environment requires an integrated approach, focusing on switching to alternative, non-fossil fuels and on reducing the energy demand by taking energy efficiency measures.

Throughout the world more and more high-rises or very tall buildings are being checked for air leaks. In February 2021 air permeability measurements were carried out in a 125-meter-high building with 37 storeys. This is the first time that a building of this height was measured in Europe. This report provides information about the planning process, the measurement concept and the measurement results.

Content of the contribution
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.

Purpose of the work

Content of the contribution

Purpose of the work
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 are intended to ensure a regulated exchange of air but are also equipped with regenerative heat exchangers which allow for exhaust air heat recovery.

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 analyses of thermal bridges in view of climate change.
Purpose of the work
Does active thermography allow realistic analyses of structural designs?
Content of the contribution

Content of the contribution
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 standard and the guideline "Airtightness measurement of high-rise buildings" (see the presentation for BuildAir 2019 Peper / Schnieders).

Purpose of the work
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.
Method of approach