TABELAS DE MAHONEY

IMPACTO DO USO DE DIFERENTES CONJUNTOS DE DADOS CLIMÁTICOS

Abstract

Mahoney Tables (TM) have been, since their publication, one of the few tools for making a priori decisions in the early stages of architectural design. However, the simplicity of TM, thanks to their fixed limits of calculation parameters of the indicators that lead to the recommendations, makes them susceptible to variations in values of climatic input data. This work aimed to test whether TM fed with data from climatic normals of Brazilian cities generate recommendations different from those obtained with data from climatic files for computer simulation of the same locations and if there are inconsistencies between them and the prescriptions of bioclimatic strategies of NBR 15220-3. Data sets from climate normals and from EPW climatic files from 1981 to 2010, common to 171 Brazilian locations, were used in the TM, and recommendations for morphology, air movement, size and shading of openings, and thermal properties of walls and roofs (thermal mass and insulation) were compared with each other and with the equivalent indications of NBR 15220-3. Results show that in most of the studied locations there are changes in the TM recommendations due to differences in the input data, particularly in afternoon relative humidity. However, neither of the two sets of climatic data guaranteed TM results fully compatible with NBR 15220-3 prescriptions in the studied locations.