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CONFERENCE PROCEEDINGS
4th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2016 , 2016.y., pp. 425-430


THERMAL CONDUCTIVITY OF MOIST AND WET MASONRY UNITS – AN IMPORTANT INFLUENCE IN ENERGY EFFICIENCY OF BUILDINGS
 
DOI: 10.14415/konferencijaGFS 2016.043
UDC: 691 : 536.2.022
CC-BY-SA 4.0 license
Author : Kekanović, Milan; Šumarac, Dragoslav; Kasaš, Karolj; Čeh, Arpad
 
 Summary:
 This article suggests a very important detail, which affects the energy efficiency of buildings - the moisture content of the insulating materials. Older generation instruments measures the thermal conductivity of materials exclusively at the dry state. That way the thermal conductivity λm (W/mK) – is measured in dry condition and the estimated value λr (W/mK), for wet materials is calculated indirectly (from tables). Often designers in calculations, accidentally or intentionally, are using λm (W/mK) for the dry state of the material, the smaller the value, which gives a greater thermal resistance R (m2K/W). The problem occurs when the materials moisture raise at winter, with increased thermal conductivity, which will directly have a negative impact on energy efficiency of buildings. Instruments of the new generation as Isomet 2114, are able to quickly and accurately measure the calculated value λr (W/mK), for in-situ state of moisture of materials, which will be in real in the winter season in the masonry. In this way it is possible to more accurately determine the thickness of the layers of the wall to meet the designed values of overall heat transfer coefficient U (W / m2K) for the real conditions of moisture of materials in the masonry.
 
 Keywords:
 conductivity, heat transfer, energy efficiency