Study of the Heat and Mass Transfer in Special Furnaces During Fire Resistance Tests of Building Construction
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One of the ways to determine the fire resistance of building structures is to conduct tests in special fire furnace. The design, metrological instruments and control methods of the fuel supply system and injectors in these furnaces are not perfect. Conditions that created in this way ensure uneven temperature distribution over the heated surfaces of the tested structures in combustion furnaces.
This study shows the results of computational experiments on the fire resistance of building structures made using various configurations of combustion furnaces. Using computer software to simulate the flow of gas and liquid, a temperature gradient was calculated for the heated surfaces of the structures and the temperature distribution was calculated for every minute of the computational experiment for each firing furnace configuration.
In temperature gradients, there were from 6,000 to 7,500 cells (depending on the specific configuration) uniformly distributed over all surfaces of the structure, containing temperature data in any moment during the computational experiment. As a result of processing of these data the value of temperature dispersion value was calculated. Difference between maximum and minimum temperatures on the surface of a reinforced concrete was also determined. Based on the curves representing temperature dispersion values at the surface of each of the simulated structures of the furnace chamber for every minute of the computational experiment the configuration with the most homogeneous temperature distribution throughout the heated surfaces of building structure was defined, what allows reducing an error occurring due to temperature distribution non-homogeneity by heated surface of structures during the fire resistance test.
KeywordsHeat and mass transfer Fire resistance Temperature distribution
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