The article present the analysis of the acoustic ceiling of the historic building. Detailed procedures for the measurement of sound insulation based on the CSN EN ISO 140-7 and in accordance witch DIN EN ISO 717-2.
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The development of building physics during last 40 years and resulting from it up-to-date scientific problems are discussed in the paper. In the author's opinion building physics is a scientific tool which enables to solve the serious problems related with the limitations imposed on the building industry, first, by the power barrier (the 70’s of the previous century) and by the ecological barrier (the 90`s of the previous century).
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Process of heat transfer in working liquid of collector is analysed in the paper. Especially, thermal power decrease of collector caused by change of sorptive properties of absorbing coatings is considered.
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