Análise comparativa entre métodos de dimensionamento de instalações prediais de água fria: manual e com utilização de software

Abstract

The hydrosanitary installations have the function of taking the water inside the buildings and guaranteeing the comfort of the users. However, this convenience can be quickly reversed when errors occur in the projects that involve these installations, causing leaks, infiltrations, insufficient pressure, difficulty and high maintenance costs. Therefore, the success of an installation depends, among other factors, on a well-designed project. Thus, the objective of this work was to compare the results obtained in the sizing of cold water installations – from the distribution subsystem – of a building, when it is done manually and automatically, with the help of two softwares. For the manual dimensioning, it was proposed the use of three equations for load losses, these being the most used for these cases. The three equations resulted in the same diameters. The project done using the two softwares resulted in the same diameters among them, which was expected, considering that both use the same standard (NBR 5626/98) as guideline for their calculations. Comparing manual and automatic sizing, the programs were more practical and fast, but the manual presented results that were more economical.