Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Annex c2 table c 1 limitations of cfast and branzfire

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Annex C2
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Table C-1 Limitations of CFAST and BRANZFIRE S/N Description CFAST BRANZFIRE 1 Maximum simulation time 86,400s [12] 2 Maximum number of compartments 30 [12] 10 [16] 3 Maximum number of fires which can be included in a single test case (including the main fire) 31 [12] 4 Maximum number of fire definitions which can be included in a single fire database file 30 [12] 5 Maximum number of data points for a single main or secondary object fire 21 [12] 6 Maximum number of material property definitions which can be included in a single thermal database 125 [12] 7 Maximum number of slabs in a single surface material in the thermal database file 3 [12] 8 Total number of ducts in all mechanical ventilation systems which can be included in a single test case 60 [12] 9 Maximum total number of connections between compartments and mechanical ventilation systems which can be included in a single test case 62 [12] 10 Maximum number of independent mechanical ventilation systems which can be included in a single test case 15 [12] 11 Maximum number of targets which can be included in a single test case 90 [12] 12 Maximum number of data points in a history or spreadsheet 900 [12] 13 Maximum single compartment size 1,200m 2 [15] 14 Maximum total virtual compartments size 5,000m 2 [15] 15 Maximum compartment height Ceiling Jet 0.58m to 22m [18] 12m [15] 16 Maximum compartment volume 60,000m 3 [15] 17 Maximum length of compartment 25m [4] 18 Maximum fire size Ceiling Jet only 0.62MW to 33MW Annex C3
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S/N Description CFAST BRANZFIRE 19 Minimum fire size within room of fire origin (This limit is not to be used as a limit to a specific design fire) 0.1 kW/m 3 [3] 20 Maximum fire size within room of fire origin (This limit is not to be used as a limit to a specific design fire) 1000 kW/m 3 [13] 21 Maximum ratio of area of vents connecting one compartment to another to the volume of the compartment < 2m -1 [13] 22 Corridor Scenario aspect ratios as follows: * (L/W) max * (L/H) max * (W/H) min L/W > 5 [13] L/H > 6 [13] W/H < 0.2 [13] 23 Special consideration for Corridor with use of corridor flow and non-corridor flow algorithm for comparison - aspect ratios as follows: * (L/W) max * (L/H) max * (W/H) min 3 <L/W< 5 [13] 3 <L/H< 6 [123 0.2<W/H<0.4 [13] 24 Single Zone compartment scenario aspect ratios as follows: * (L/W) max * (L/H) max * (W/H) min L/W < 3 [13] L/H < 3 [13] W/H > 0.4 [13] *List not exhaustive (v) List of Approved Zone Models: CFAST BRANZFIRE To seek consensus from SCDF for the use of other zone models (c) Field Models (i) The field model solves fundamental Navier-Stokes equations using numerical method, commonly known as computational fluid dynamics (CFD). It allows study of extremely complicated problems even with irregular and complex geometry. The primary advantage of a field model is that it can provide detailed information on the fluid motions in three-dimensions as compared with zone model (except one-dimensionally). In general, a more powerful computer than desktop personal computer will be required to run CFD.
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