Bauphysik最新文献

The chilled water wall: Corrosion estimation of the copper heat exchanger and development of a hygiene and maintenance schedule

Various tests and analyses were carried out to assess the operational safety of the air conditioning system chilled water wall, developed by the Fraunhofer Institute for Building Physics IBP. The mobile version of the chilled water wall features a copper heat exchanger. Due to the potential risk of corrosion caused by the acidic pH value of the fully desalinated operating water (DI water) specified by the manufacturer, a qualitative corrosion estimation was carried out. For this purpose, inductively coupled plasma mass spectrometry (ICP-MS) was used to quantify copper ions in water samples. The hypothesis that no further corrosion occurs after the water is saturated with copper ions was refuted. It was shown that a steady progression of corrosion of the heat exchanger is to be expected. Based on appropriate standards, various factors and types of corrosion relevant to copper materials were investigated and evaluated and possible corresponding measures were derived. In addition, a hygiene and maintenance plan was developed based on the system manufacturer's instructions and applicable guidelines. Tests and measures to be carried out, as well as the necessary time intervals, were considered and additional requirements were included.

Summer heat protection of traditional buildings over the course of time

Around 25 % of all buildings used for residential purposes in Germany were constructed prior to 1950. These buildings, too, must function under increasingly extreme climatic conditions. Thus, the central question of this study is: How does the summer heat protection of historic buildings change under projected climate scenarios up to the year 2100? To answer this question, three representative buildings from Stuttgart are analyzed: a timber-framed house (around 1800), a Wilhelminian-style building (1886), and a Bauhaus building from the Weissenhof Estate (1927). A fictitious building with exterior components in accordance with the requirements of the German Building Energy Act (GEG) is used for comparison. The thermal behavior is analyzed using the hygrothermal simulation software Wufi^® Plus. The analysis is based on historical, current, and projected climate data. In addition, parameter studies are carried. In total, 4.608 building simulations are evaluated in this paper.

Sound and fire behaviour of a hybrid willow-clay-wood composite ceiling

The construction industry generates high levels of emissions and waste by using non-recyclable, energy-intensive building materials and compounds. Using construction methods based on natural raw materials enables closed material cycles. Developing such methods requires a holistic approach, examining the advantages and disadvantages in detail to provide a valid basis for further development. The research project presented below addresses these aspects by developing a recyclable construction system for multi-storey buildings based on clay, wood, and willow. In addition to the further development of component designs, the central objectives were to conduct static and building physics investigations, prepare a life cycle analysis, and highlight additional ecological aspects. This article critically discusses and evaluates the sound and fire performance of the developed ceiling.

Variable Dampfbremsen: Ermittlung feuchteabhängiger Diffusionswiderstände Datenbasiertes numerisches Tool zur Ökobilanzierung von Kalksandsteinprodukten Leiser lüften: intelligente akustische Fenster- und Lüftungssteuerung Akustik für den Denkmalschutz - Maßnahmen, Planung und Validierung Mehr als nur ein Kennwert: der U-Wert im Zusammenspiel von Bauphysik, Technik und Förderung

Für die Umgestaltung des zentralen Platzes im Ortskern der Gemeinde Alfter, dem "Herrenwingert" wurde ein integriertes städtebauliches Entwicklungskonzept aufgestellt. Das von Königs Architekten PartGmbB gemeinsam mit STERN LANDSCHAFTEN BDLA vorgelegte Gestaltungskonzept konnte die Jury des Architekturwettbewerbs und den Gemeinderat überzeugen. Ein erstes umfangreiches Projekt war der Neubau einer Kultur- und Sporthalle als Ersatz für die baufällige und nicht wirtschaftlich zu sanierende Mehrzweckhalle in direkter Nachbarschaft zum Neubau. Der Bolzplatz, der dem Neubau weichen musste, findet zwei Etagen höher auf dem Flachdach der neuen Kultur- und Sporthalle einen modernen Ersatz. Hier sind außerdem Fitness- und Erholungsbereiche und ein Ballsportfeld vorgesehen. Der multifunktional nutzbare Hallenbau ist mit dem ökologischen EVALASTIC-Flachdachsystem (Fa. Alwitra) abgedichtet, siehe auch Beitrag ab S. XX. (Foto: alwitra/Sven-Erik Tornow)