Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Evaluation of the thermal performance of industrial sheds via computer simulations: obtaining Tg and Twb by means of iterative algorithms for application in the index WBGT
Submission Author:
Bruno Henrique Lourenço Camargos , MG
Co-Authors:
Bruno Henrique Lourenço Camargos, Lidianne de Paula Pinto Mapa, André Cesar Martins De Miranda, Artur Ladeira, Reinaldo Reis, Henor Artur Souza, Adriano Gomes
Presenter: André Cesar Martins De Miranda
doi://10.26678/ABCM.COBEM2021.COB2021-0844
Abstract
In a broader context, the study of environmental comfort in buildings evaluates a new approach in relation to architecture, since it seeks to define a new treatment of the construction parameters considering, in short, the place, its surroundings, the climatic context and the practices of construction sites combined with environmental awareness. In Brazil, these discussions on energy efficiency are gaining importance, and the search for buildings with better thermal performance and lower energy consumption is more evidence. Thus, an analysis of the thermal performance is carried out via computer simulation of industrial sheds equipped with an internal source of high intensity heat, in order to assess the internal conditions of hygrothermal comfort. The influence of some configurations of the natural ventilation apparatus is studied, and the final annual results are compared with the limits of the wet-bulb globe temperature (WBGT), as a way of assessing occupational exposure to heat. The WBGT index consists of a thermal overload, defined by a mathematical equation that correlates the globe temperature and wet-bulb temperature measured in the workplace. The globe temperature (Tg) and wet-bulb temperature (Twb) are not possible outputs to be obtained directly from the EnergyPlus software and, for this reason, they are found through the algorithms formulated from iterative techniques. Basically, three variables of environment are of interest: temperature, air speed, and relative humidity. The proposed algorithms converge properly and, when comparing the final annual results of the WBGT index with the limits provided for in the Brazilian regulatory standard NR-15, it is observed that the shed equipped with longitudinal and transversal ridge vents has better thermal performance, thus providing less time of discomfort due to the heat.
Keywords
Thermal performance, natural ventilation, Iterative Methods, WBGT index
