Reinigbare und chemisch beständige Schallabsorber

摘要

In modern energy-efficient heating systems with low waste gas temperature, the water vapor in the exhaust flow generated during the combustion process condenses and forms, in connection with the waste gas, corrosive condensate. Thus, the absorber material for exhaust silencers must combine chemical resistance with acoustic properties. In cooperation with a manufacturer of exhaust silencers as well as a manufacturer of PTFE products, Fraunhofer-IBP developed a sound absorber comprising of the integral properties of condensate resistance, sound absorption in the range of medium and high frequencies together with cleanability and reusability features. This paper presents the results of the research project carried out for this purpose [1, 2]. The approach for a sustainable solution to this acoustic, ecological and finally economic problem is presented that starts from the selection of materials. On a laboratory scale, patches of absorbers were created and their chemical and acoustic properties determined. The input data for the model of an absorber are derived using a material model. These calculations are compared with measurements and are discussed. Possibilities of cleanability and recycling of the sound absorber are illustrated with an example of a silencer for heating systems. The presented project approach for heating systems with cleanable and chemically resistant sound absorbers has a considerable potential for transfer in other sectors such as the medical and food industry.