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Analysis of the ISO 9705 Room/Corner Test: Simulations, Correlations and Heat Flux Measurements.


pdf icon Analysis of the ISO 9705 Room/Corner Test: Simulations, Correlations and Heat Flux Measurements. (18709 K)
Dillon, S. E.

NIST GCR 98-756; 216 p. August 1998.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB98-172422

Keywords:

corner tests; heat flux; fire data; fire growth; fire models; gas burners; material properties

Abstract:

A simulation model is implemented in order to predict the fire performance of materials in the ISO 9705 Room-Corner Test. These materials were tested by the L S Fire Laboratories of Italy, and the data they provided is analyzed in this report. A method was established to define material properties including the heat of combustion, heat of gasification, thermal inertia, ignition temperature and the total energy relesed per unit area. These methods were developed from refinements in a theoretical model of ignition and in resolving time dependent effects in the Cone Calorimeter. The materials examined consist of some of the most difficult to analyze because they melt, drip, expand and de-laminate from the wall and ceiling configuration of the room-corner test. Corrections have been included in the simulation modeling to account for these effects. The correction involves reducing the total energy content per unit area of the material to accordingly reduce its contributions as a wall-ceiling oriented element. An empirical correlation based on a linearized upward flame spread model is shown to provide excellent comparison to the flashover time in the full-scale ISO test. Accurate heat flux measurements from the ignition burner at an energy release of 100 and 300 kW were made from full-scale room-corner tests. Corrections to these heat flux measurements provide the incident heat flux from the burner fire plume and from a combination of the plume and the thermal feedback of the heated room. Detailed heat flux distributions along the walls and ceiling in the vicinity of the ignition burner are provided.