ESTUDO COMPARATIVO ENTRE OS MÉTODOS DE PERDAS DE CARGAS EM DIMENSIONAMENTOS DE PROJETOS PREDIAIS DE ÁGUA FRIA

Abstract

The cold water system design should be based on relevant literature and adhere to the NBR 5626 (ABNT,2020). This study aimed to size the installation of cold water in a residential bathroom considering the Fair-Whipple-Hsiao unit head loss methods and the universal equation for obtaining dynamic pressures at consumption points. The design was calculated using a Microsoft Excel® spreadsheet and the AltoQI Builder Hidrossanitário Basic 2021® software for data comparison purposes. It was observed that the dynamic pressure values generated by the AltoQI Builder® software were slightly higher than those in the spreadsheet when using the universal and Fair-Whipple-Hsiao methods. Discrepancies were in the first decimal place for the universal method and the second for the Fair-Whipple-Hsiao. The precision in the formulations for friction factor calculation and the adoption of connections in the analyzed sections may have influenced the results. Thus, both head loss methods did not result in significant changes in the sizing of the single-family hydraulic installation. Such minor differences have no significant impact on building systems, indicating that a calculation routine in an electronic spreadsheet can be deemed a valuable research tool for academic studies.