Acoustic properties of building structures are currently very actual theme with regard to the development of new building and insulating materials, while the methods for estimating the airborne sound reduction index evolve mainly from the second half of the 20th century. For mutual comparison of selected prediction methods and for determination of their suitability it has been provided a calculation of weighted sound reduction index RW [dB] from the input parameters of materials identified by laboratory measurements, calculation of weighted apparent sound reduction index R ́W [dB] and these values were compared with in-situ measurements. The aim of this paper is to determine the most appropriate method to calculate RW [dB] and R ́W [dB] values of lightweight building constructions with regard to their practical applicability, accuracy of estimation and complexity of the calculations.
Natural eco-friendly materials are widely discussed topic nowadays, especially in the context of the implementation of European legislation into national legislation and with the increasing demands on the energy efficiency of buildings. The majority of builders still prefer the classical artificial materials. One of the reasons is the lack of technical information, particularly in the field of building acoustics and fire safety, which would be demonstrated by appropriate research. The aim of this study is to compare the acoustic properties of selected structures based on natural materials which are based on research results and a series of measurements with conventional materials to demonstrate their competitiveness.
The aim of this paper is the assessment of structures in terms of the lowest internal surface temperature. It assessed the risk of condensation of water vapor on the surface of these structures. This assessment will be conducted by probabilistic calculation based on data acquired in Vocational training center MSDK. Using this calculation will be found how many times during the year the internal surface temperature drops below the dew point on the inner surface of the structures.
This article deals with probabilistic calculation of the behavior of the peripheral wallof the wooden passive house in terms of the temperatures inside the structure in the winter. The probabilistic calculation was made for the actual boundary conditions, ie. actually measured exterior and interior temperature. The results of the probabilistic calculation are ultimately compared with the results of experimental measurements of temperature inside the structure, ie. the actual behavior of the structure.
In the last decade we have been confronted with problems with biotic infestation of facades in engineering practice. The presence of microscopic algae and funguses on the facades of thermal insulation buildings distorts the appearance of buildings with green, brown or black coating. The reason for biotic pests beginning to appear on the facades of buildings very often is mainly the enlargement of thickness of thermal insulator ETICS. Thanks to the thermal insulation of facades with large thickness less thermal energy penetrates into the surface or plaster surface. The outer side is warmed up less and therefore it has lower outer surface temperature. Lower outer surface temperatures enable hypothermia of the surface of facades. The hypothermia of facades appears especially at night. The resulting aqueous film is the basic source of the necessary damp needed for the life of algae and funguses on facades of buildings. The presence of damp on the outer surfaces rises significantly depending on the better thermal insulation of walls.
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