A technical reference for CFAST :

Jones, Walter W.; Forney, Glenn P.; Peacock, Richard D.; Reneke, Paul A.

doi:10.6028/nist.tn.1431

Cited by 30 publications

(8 citation statements)

References 47 publications

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“…It can be seen that for the sprinklers closest to the center line (sprinklers 1, 2, 5, 6, 9,10), there is a good fit to the correlation by Motevalli and Marks, but for the sprinklers further away (sprinklers 3,7,11,4,8,12) and close to the edges at the side, the ceiling jet is thicker. The reason for such a result is the vortex created when the ceiling jet hits the sides of the raised ceiling.…”

Section: Thickness Of Ceiling Jetmentioning

confidence: 52%

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Influence of Draft Curtains on Sprinkler Activation -- Comparison of Three Different Models

Husted

Holmstedt

2008

Journal of Fire Protection Engineering

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This article investigates the importance of using draft curtains to obtain faster sprinkler activation with three different models-two computational fluid dynamics (CFD) models (CFX 4.4 and fire dynamics simulator (FDS) 4.07) and a zone model (Argos) containing a ceiling-jet formula -for an actual scenario in an entertainment center in Denmark. It is found that a draft curtain has some effect on sprinkler activation, reducing activation time from 8% to 15%, depending on the model implemented. The positions of the sprinklers with in the vertical computational grid of the CFD simulations have a greater influence on the activation of the sprinkler, where FDS is more sensitive than CFX. It is confirmed that heat transfer from the ceiling jet to the ceiling has little influence on the results. The zone model with a ceiling-jet formula gives 10-20% slower sprinkler activation than the CFD results when the sprinkler is close to the ceiling, but is still considered very useful in view of the faster calculation time.

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Section: Thickness Of Ceiling Jetmentioning

confidence: 52%

“…This is the case for the zone models BRANZFIRE [2] and Argos [3], whereas the probably most well known zone model CFAST [4] uses the approach by Cooper [5]. Beyler [6] studied several different empirical ceiling jet formulas, including Alpert's formula.…”

Section: Introductionmentioning

confidence: 99%

Influence of Draft Curtains on Sprinkler Activation -- Comparison of Three Different Models

Husted

Holmstedt

2008

Journal of Fire Protection Engineering

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“…In particular, the focus was on the fire spread from an initial fire in rack storage to adjacent racks without any suppression system. The test program presented in the report [18], consisted of six different test series: These tests were simulated by using the software CFAST (Jones et al 2006) [20] developed by NIST which is a twozone fire model that predicts the thermal environment caused by a fire within a compartmented structure, allowing to model different compartments which can communicate to each other. to model the vertical propagation of a localized fire, the Test 5 which consists of the study of the vertical and horizontal fire propagation in a group of four racks was simulated.…”

Section: Fire Modellingmentioning

confidence: 99%

Fire modelling and structural assessment of automated clad‐rack warehouses

Autiero,

de Silva,

Bilotta

et al. 2023

ce papers

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Automated Rack Supported Warehouses (ARSW) are self‐bearing rack structures designed to support, besides self‐weight and weight of products, environmental loads (i.e., wind, snow and seismic action) and all the other non‐structural elements. These structures are unique in the design; indeed, they represent a topic of great interest for both the scientific community and for the manufacturers of industrial racks. However, the behavior in case of fire of these structures is still poorly known. In order to study the fire resistance of these structures to consider a natural fire curve is necessary. In particular, a vertically traveling fire model in the upright frames, starting from a localized fire has to be modelled.This paper proposes a fire model that considered both the vertical and horizontal fire propagation, evaluated and validated against experimental test results. In addition, advanced thermo‐mechanical analyses using both natural and nominal fire curves, were performed with a finite element software (SAFIR), which allows modeling Class 4 steel elements considering the local instabilities that can occur in these slender sections. A comparison between the capacity models that the regulations propose for these structural elements, was also conducted.

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“…The effective resistance between two nodes is always positive, however, sometimes one of the resistances between nodes can be negative as will be explained later. To account for this, R = K ½ can be substituted into eq (74) to give ti The total pressure loss, )p , from one node to the next is the sum of the losses, )p , through each flow element, i, between the nodes.…”

Section: Fansmentioning

confidence: 99%

CFAST- consolidated model of fire growth and smoke transport (version 5) :

Jones¹,

Peacock²,

Forney³

et al. 2004

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CFAST is a two-zone fire model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evolving distribution of smoke and fire gases and the temperature throughout a building during a user-prescribed fire. This report describes the equations which constitute the model, the physical basis for these equations, and an evaluation of the sensitivity and predictive capability of the model.

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A technical reference for CFAST :

Cited by 30 publications

References 47 publications

Influence of Draft Curtains on Sprinkler Activation -- Comparison of Three Different Models

Influence of Draft Curtains on Sprinkler Activation -- Comparison of Three Different Models

Fire modelling and structural assessment of automated clad‐rack warehouses

CFAST- consolidated model of fire growth and smoke transport (version 5) :

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