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Thermal analysis in fire-resistance Furnace
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Resumo(s)
Fire resistance rating of building construction elements is defined under fire-resistance test
furnace. The geometry and shape of fire-resistance furnaces is not defined by any prescriptive
document, being necessary to comply thermally with specified nominal fire curves, such as
ISO 834 or hydrocarbon [1,2].
This research work intends to measure temperatures inside furnace volume, using sixteen
plate thermocouples to compare average temperature in four planes. Those planes are
compared with reference thermocouple which is responsible for controlling furnace operation,
see figure 1. Three tests were performed, the first two running with ISO 834, during 45
minutes and the last one running with hydrocarbon curve, during 30 minutes. Experimental
results demonstrate that relative temperature differences are smaller than 30 % in the initial
test stage, being smaller than 5 %, after 500 [s] until the end of the tests.
The numerical simulations were performed using Fluent CFD, using the structured finite
volume mesh method. The Eddy Dissipation Model (EDM) was used for chemical species
transport and reacting flow. The governing equations for mass, momentum and energy were
solved for the three dimensional unsteady incompressible flow, with radiative heat transfer
and turbulence model. The numerical results agree well with experimental results, being the
relative temperature difference smaller than 5% for each nominal test. Numerical simulation
also reveals the localized effect of each burner.
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Citação
Piloto, P.A.G.; Mesquita, L.M.R.; Pereira, Alexandre (2009). Thermal analysis in fire-resistance Furnace. In International Workshop on Fire Protection and Life Safety in Buildings and Transportation Systems. Santander, Spain.