Längsdämmungsmessung in normalen Schalldämm‐Prüfständen

Measurement of longitudinal sound reduction in standard test facilities. The German standard DIN 4109 requires the knowledge of the longitudinal sound reduction of flanking building components. Many test laboratories do not posses the proper test facilities and therefore install the test objects alongside the flanking wall of the test facility, thereby creating a narrow cavity. The influence of this cavity on the longitudinal sound reduction was examined experimentally and numerically. This should clarify under which conditions the longitudinal sound reduction can be measured using this setup. The article presents the experimental examination.     

Die Klimaabhängigkeit optimaler Wärmedämmung

Climate dependency of optimum thermal building insulation. Calculation methods of economically optimum U‐values of opaque and transparent building elements are treated. Hereby, methods of precise and of simplified approximate calculation are discussed. The dependency of climatic conditions is studied in detail. For the calculation of economically optimum U‐values of opaque and transparent elements only the knowledge of the climatic data annual mean outdoor temperature and indoor temperature is necessary for a simple approximation. The applied concept of economical optimization based on heat demand may be used in climatic regions, where the lowest value of the smoothed outdoor temperature is not higher than 12 °C. Isolated optimization of building envelope elements is justified as long as the highest value of the smoothed outdoor temperature is not substantially higher than the indoor temperature, applicable in Europe for cold and temperate climate regions.