COMPARATIVE ANALYSIS OF HEAT-INSULATING PROPERTIES OF WALLING MADE OF PROFILED BEAMS

Purpose: The aim of this paper is to evaluate and compare heat-insulating properties of various beam structures depending on their geometry and thermophysical parameters of wooden elements and insulating materials, which are used both under stationary and non-stationary conditions of heat transfer, including cyclic changes in the outside air temperature.Design technique: The numerical simulation is performed for non-stationary heat transfer which occurs in external walling systems made of profiled beams with connectors. Based on the obtained results, the temperature fields and heat fluxes in the selected inhomogeneous fragments are calculated.Results: The appropriate heat-insulating properties are determined and compared with a view to use them in considered beam structures. The reduction in heat-insulating properties is evaluated for the non-stationary heat exchange and the walling system elements. The degree of thermal stability is determined  for the walling systems made of profiled beams with horizontal and vertical connectors made of veneer wood.Practical implications: The obtained results can be used in new design of heat-insulating profiled beams with vertical and horizontal connectors internded for the production of energy-efficient external alling systems in low-rise house building.Originality/value: The influence of inhomogeneous sections of walling systems on temperature fields and heat fluxes is investigated for non-stationary thermal conductivity. The investigation results show that heat-insulating properties of walling systems made of profiled beams with H-shaped vertical connectors made of veneer wood with the inner longitudinal lamella, greatly exceed heat-insulating properties of other beam structures considered in the paper.

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