Methods of mathematical modeling of fire extinguishing systems and their implementation in the ISIGR software package

Egor Mikhailovsky,N.N Novitsky,V.R Chupin,V.V Tarasevich,E Todini,V.A Stennikov,L.B Korelstein,B Serttter,M.G Sukharev,C Sarica,E Khaltar,M Negnevitsky,S.A Miedema

doi:10.1051/e3sconf/202021904002

Abstract

The basis of fire protection of production, retail, warehouse, and other facilities are automatic fire extinguishing installations, internal fire fighting mains, and water curtains, which are an integral part of the water supply system. When designing such systems one shall perform the hydraulic analysis, the results of which allow selecting the required equipment mix, estimating performance of systems under different modes, and so on. The hydraulic analysis is usually performed either manually/with partial automation or using algorithms that implement numerical simulation methods. The latter requires readily available programs that greatly simplify making up the system of equations by forming an analytical model from the nodes and connecting branches. The software products currently available on the domestic market are either fail to deliver the expected benefits or have high cost and require user training. We present the conceptual and mathematical statement of the flow distribution problem with non-fixed nodal flows for an arbitrary pipeline system, including fire-fighting one, and the corresponding modification of the nodal pressure method that factors in the dependence of the flow through the nozzles (sprinkler, drencher) on the pressure (head) upstream. This and other problems lend themselves to solving with the help of the “ISIGR” online application package.

Highlights

Automatic fire-extinguishing installations (AFI), internal fire-fighting mains (IFM), and water curtains are essential engineering structures that allow a prompt fire response in office, retail, manufacturing, entertainment, storage, and other facilities
The most challenging part of the hydraulic analysis of AFIs, IFMs, water curtains, and other similar pipeline systems (PLS) is to ensure the intensity of water or water solution flow by the most remote nozzle that does not fall behind the required level under, perhaps, a slight change in the intensity at other nozzles operating within the given area
We elucidated the relevance of the application of methods for the numerical solution of the flow distribution problem to fire-fighting pipeline systems

Summary

Introduction

Automatic fire-extinguishing installations (AFI), internal fire-fighting mains (IFM), and water curtains are essential engineering structures that allow a prompt fire response in office, retail, manufacturing, entertainment, storage, and other facilities. Peculiarities of fire-fighting systems (dendriform or multi-path configuration, small dimensionality, and equivalence of dead-end branches of the network) that lend themselves naturally to performing the hydraulic analysis "manually" (SP 5.13130.2015) [5]. In the case of looped circuits, there are no implementations of numerical simulation methods in the form of simple, convenient, and affordable computer programs. The most popular programs available on the domestic market for the hydraulic analysis of fire-fighting systems are covered below. "MagiCAD" (Finland, ventsoft.ru), "SprinkCAD" (USA, sprinkcad.com) are systems of programs and modules developed within the framework of BIM-technologies ( Building Information Modeling) for displaying three-dimensional models and performing the hydraulic analysis of the AFI and IFM in Autodesk AutoCAD and Revit. The main disadvantage of these programs is their high cost and a steep learning curve on the part of the user

Problem statement

Implementation technology

Internet-based hydraulic analysis

Conclusion