Name: Mariana Vallory Michel
Type: MSc dissertation
Publication date: 22/03/2019

Namesort descending Role
Andréa Coelho Laranja Advisor *

Examining board:

Namesort descending Role
Andréa Coelho Laranja Advisor *

Summary: According to the maximum admissibility of the solar absortion of external walls (PE) for Bioclimatic Zone 8 (ZB8), the NBR 15.575-4 classifies buildings with all black facades with satisfactory thermal performance for cities with hot weather, provided that it respects to a maximum thermal transmittance (U max). Thus, this dissertation aimed to evaluate the nonconformities of the thermal performance properties of the NB 15.575-4 ZB8 with indexes of adaptive thermal comfort by orientation, in order to find out the ranges of thermal transmittance (U) and solar absorptivity (α) of external walls that are capable of providing satisfactory thermal comfort. This dissertation had its field of delimitation delimited to vertical residential buildings multifamily in ZB8, exemplified by the most recently constructed by the main developers in the city of Vitória (ES) according to the 31º Censo Imobiliário da Grande Vitória of the Sindicato da Indústria da Construção Civil no Estado do Espírito Santo. More specifically, this research was limited to opaque closures (analysis of its thermal properties: thermal transmittance and solar absorptivity of ZB8) and external walls (subsidy for simulations of thermal properties and analysis of these elements specifically in the construction of Vitória). The sample was defined by four external walls (two of Vitória and two with the maximum parameters of U of NBR 15.575-4) and six or ten α (according to the maximum of NBR 15,575-4 of U / PE). 512 simulations were done in the DesignBuilder program of a room with two exterior walls facing the outside, defining the simulation scenarios with and without occupation by the eight combinations of possible orientations of the cardinal points. The 8,760 hourly operating temperatures of each simulation were worked considering the 80% percentage of adaptive comfort of the ASHRAE 55. The results were analyzed having as reference of the parameters of the NBR 15.220-3 and were based on comfort indexes: Frequency of Discomfort (DFT), Number of Hours of Thermal Discomfort (QHDT) and Degrees-hours of Thermal Discomfort (GhDT). It was verified that the thermal parameters of NBR 15.575-4 in isolation do not meet the indices of adaptive thermal comfort. The two NBRs accept that all external walls are black (α of 100%), but NBR 15.575-4 reveals up to 2.5 times more permissive to allow darker colors for the same U, presenting results with greater incompatibility with comfort indexes for all scenarios. The difference from meeting NBR 15.575-4 instead of NBR 15.220-3 can reach 5.97 degree-hours per hour of average discomfort (about ¼ more than allowed) for approximately two months in the year. The parameters of criterion 2 of NBR 15.575 (U ≤ 2.50 W / m².K, α max 1.00) present even worse results than those of criterion 1 (U> 2.50 W / m².K, α max 0 , 60). It is concluded that the preterm construction guidelines of the bioclimatic zone are of great relevance for the worst performance of the external walls that meet the parameters of NBR 15.575-4 instead of those of NBR 15.220-3, but new studies need to be done considering all the bioclimatic strategies indicated in this for ZB8. In this sense, it was compiled as a contribution to the city of study the schedules of the month by combining orientation with discomfort for Vitória - serving as a subsidy for the application of these strategies and in particular for sizing device shadowing.

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