Experimental assessment of thermal conductivity of grinded brick block in the conditions of semi-scale experiment

Z. Pavlik1, L. Fiala1, M. Jerman1, J. Zumar1 and R. Cerny1

1Czech Technical University Prague, Czech Republic

Keywords: perforated jagged block, Heluz, thermal conductivity, Nonstat
property: thermal conductivity
material: brick perforated jagged block

The burnt ceramic brick is the oldest artificial building material used in practise. Although the ceramic brick has changed significantly during the time, it still maintains favourable properties. Current brick is a material with good mechanical resistivity, perfect thermal insulation and heat accumulation function resistant to air humidity fluctuation, high water vapour permeability and no toxicity. These features affect positively the interior climate of buildings providing a comfortable living. So, the specific and time-tested quality makes bricks one of the best building materials on the market. However, with a view to the increasing requirements on quality of indoor climate together with heating costs, the bricks’ producers must reflect this situation and design a new materials decreasing the operating expanses of buildings. On that account, new types of brickworks based on brick perforated jagged block must be developed. In this paper, newly developed brick block produced by Heluz, Czech Republic, is studied. Since this material is used for construction of outer buildings’ walls, its thermal conductivity and mechanical properties represents the most important material parameter. A new steady state technique for the assessment of thermal conductivity of entire brick block is developed. A system of two climatic chambers separated by the connecting tunnel for sample positioning is used. The brick block is provided with necessary temperature and heat flux sensors and thermally insulated in the tunnel between the climatic chambers. In the climatic chambers, specific different temperatures are set. 1D heat flux through the studied brick block is simulated until the steady state heat flux is obtained. Then, calculation of thermal conductivity of newly developed brick is done using the measured data. For the assessment of temperature dependence of brick block’s thermal conductivity, several temperature differences are simulated in the chambers. The obtained results represent decisive information for practical application of the studied material in building construction.

This work has been financially supported by the Ministry of Industry and Trade of Czech Republic, under project No FR-TI2/007

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