Dimensionamento e análise de uma rede de hidrantes através de cálculo analítico e simulação numérica

Abstract

In the last decades, with the strong urbanization of the society, the cases of fire in Brazil have increased, for this reason, rigorous technical norms are required by state and federal laws, and these are inspected by the Fire Department for certain types of buildings, with the objective to avoid such disasters. This scenario has created a great market opportunity for companies that work with fire-fighting projects, so in a business that is becoming more competitive every day, is necessary a good project to guarantee quality, safety and cost reduction. In this work an analytical dimensioning of a hydrant network for a commercial building of construction materials in the region of Dourados-MS was done, in order to define the main parameters of the system. Afterwards, a numerical simulation was performed using the Ansys Fluent software, as well as Ansys Meshing software for mesh creation, Autocad and SolidWorks for the design of the hydrothermal network of the analytical and numerical model, respectively. The simulation was generally satisfactory and for some values, such as pressure at the pump outlet, results were very close to the analytical with an error of only 2.15 %. However, for other values, such as velocities, there were a discrepancy of results. With this, it is possible to affirm that the simulation needs some future improvements. However, it is in the right direction for a validation. Finally, it can be stated that to meet any fire principle in the place will require two hydrant points, about 57 meters of pipe alternating between 2.1/2"and 3"in HDPE or galvanized steel, the first one used just under the ground. As for the pump, it should be of the centrifugal type and its engine should be electric with a power of 8.6 hp, it can also be affirmed that there will be no cavitation in the system, guaranteeing its perfect functioning.