Ermittlung des Aufbaus und der Stoffkennwerte von Außenbauteilen mit Hilfe von In‐situ‐Messungen und FEM‐Berechnungen

Determination of the construction and the material identity values of outside building components with the help of in‐situ measuring procedures and FEM‐simulation calculations. The aims formulated nationwide and internationally to the climate protection can be achieved by combining of the energy‐efficient construction and rehabilitation of the existing buildings. Knowledge about the construction and the material identity values of the warmth‐transferring outside components is a condition for the energetic balance of buildings. The essential information to this can frequently be no more taken from the construction documents particularly for older buildings since they are no longer traceable or incomplete. At the example by univalve and bivalve out‐wall construction it is shown that the thermophysical qualities can be determined with the help of in‐situ measuring procedures and FE‐simulation calculations without destruction.     

Experimentelle und numerische Untersuchungen von Brandszenarien vor Fassaden unter Berücksichtigung verschiedener Abstände

Experimental and numerical investigations of fire scenarios in front of façades considering various distances Constructional boundary conditions, e. g. walls or façades, close to ignition sources affect the fire formation and the plume. It is already known, that boundaries (e. g. walls) constrain the entrainment of air and oxygen into the plume and the combustion of gas or flammable products is completed at larger heights. How far the location of the fire sources, the building geometry and the heat release rate affect the characteristics of a flame is investigated at the Institut für Baustoffe, Massivbau und Brandschutz (iBMB) of TU Braunschweig in line with a series of experiments with a square gas burner. For the implementation of the fire tests the test rig in Braunschweig is provided with extensive measurement techniques to determine heat flux, wall‐bounded temperatures, temperatures for plume measurements and upward velocity. In this paper the data of the fire tests are discussed and compared with the results of a CFD‐Model and selected empirical calculation approaches.     

Polystyrol‐Extruderschaum mit verbesserten wärmetechnischen Eigenschaften — Entwicklung,Prüfung und Anwendung

Ein neuer Wärmedämmstoff aus extrudiertem Polystyrol‐Hartschaum (XPS) mit geringerer Wärmeleitfähigkeit wurde entwickelt, um die erhöhten Anforderungen an einen dauerhaften Wärmeschutz von Gebäuden einfacher und mit geringerem Materialaufwand zu erfüllen. Die bewährten mechanischen und hygrothermischen Eigenschaften von XPS‐Dämmstoffen werden beibehalten. Die erste Produkt‐Generation ist insbesondere für die außenliegende Wärmedämmung von erdberührten Wänden und Böden sowie für die Kerndämmung von zweischaligen Wänden entwickelt worden. Das verwendete CO₂‐Schäumverfahren entspricht den bestehenden Anforderungen an die Nachhaltigkeit von Bauprodukten. Development, testing and application of extruded polystyrene foam (XPS) insulation with improved thermal properties. Improved extruded polystyrene foam (XPS) insulation with lower thermal conductivity has been developed. This enables meeting the increased requirements for sustainable building insulation with better material efficiency. The proven mechanical and hygro‐thermal properties of XPS insulation are maintained. This first product generation has been developed primarily for external perimeter insulation of basement walls and floors as well as for the insulation of cavity walls. The CO₂ foaming technology meets the sustainability requirements for building products.