Development and harmonization of test standards for fire classification of building products is actively investigated at current moment. Investigation of such standard test characteristics and sensitivities is a part of each standard development process. While the full-scale tests with alternative details cannot be avoided, many of the phenomena can be studied using Computational Fluid Dynamics simulations.The main task of this thesis was to investigate the sensitivity of the building façade fire test standard ISO 13785-2 on the details of the test setup. The practical tasks were to prepare a validated model for the ISO 13785-2, to characterize insulation materials for simulation purposes, and to demonstrate the use of CFD in façade fire test simulation.The validation of the simulation model was performed by the simulation of specific fire test of non-combustible façade conducted in TUS (Tokyo University of Science) laboratory which results was published in Journal of Fire Science and Technology in 2012. In the test series, a range of different heat release rates was used. After the validation, the model was used for investigating heat fluxes at different heights above the opening and temperatures at different depths.Excluding the fires with small fire load as they were not representative to the stand-ard test conditions, the model provides results with bias of 0.84 for heat flux and 1.05 for temperature on façade wall. The test series with only one additional opening in rear side of combustion chamber gave the most accurate results. The largest devi-ation between numerical and experimental results was observed in the tests with fuel flow rate smaller than ½ of ISO (60 g/s). In addition, significant differences be-tween the measured and simulated temperatures inside the combustion chamber were found.A series of small flammability test, such as TGA, MCC, DSC and Cone Calorimeter test, were conducted for common combustible insulation materials. All achieved results were used for determining fire protection of combustible insulation materials in large-scale test conditions. As a result, 70 mm of fire protection is needed for defend-ing EPS against burning and 60 mm against melting in the most critical region from 0 mm to 400 mm above window. For PIR this layer thickness should be not less than 90 mm.
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