Banca de DEFESA: PATRICIA MARTINS TORRES DE MACEDO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PATRICIA MARTINS TORRES DE MACEDO
DATE: 14/02/2022
TIME: 09:00
LOCAL: Auditório Pós-Graduação em Engenharia Civil on line
TITLE:

Ecological Roofs: Evaluation of Thermal and Hydrological Performance in a Humid Tropical Climate

KEY WORDS:

green roofs, expanded clay, holding capacity, thermal comfort.

PAGES: 127
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

In the context of sustainable constructions, the incorporation of environmental technologies is increasingly seen and ecological roofs are inserted as they contribute to the reduction of heat islands and rainwater runoff. This research aims to evaluate the thermal and hydrological performance of different types of ecological roofs in a humid tropical climate. The research began with the construction of the Experimental Unit with five Test Cells (CTs), floor and roof area of 1.00 m2, and a total height of 2.75 m. In three coverings were used: Esmeralda grass, Coroa-de-Frade cactus and expanded clay, configuring the two comparative groups (with and without vegetation cover). Inside each CT, automatic temperature and humidity meters were installed. Data were monitored for 9 months, with daily monitoring frequency. Based on the data collected and calculated (average temperature of the walls - TMP, of the ceilings - TMT, and of the environment - TMA; mean relative air humidity -URM; and external temperature and humidity): the influence of the seasons and the time of day and the hourly temperature rise and fall trajectory, as well as the interference of precipitation on internal and external temperatures. In the warmer months, grass showed greater efficiency in reducing TMP (-0.29 oC), while clay stood out in TMT (-1.27 oC) and TMA (-0.66 oC), whereas cactus was more efficient. in the increase in RH (4.7%). In the cooler months, the use of cactus resulted in the best results for all variables (TMP, TMT, TMA and URM). Regarding the time of day, the best result for TMP was obtained with grass (-0.48 oC) between 4 pm and 12 am, while clay showed better results for TMT (-2.13 oC) and TMA (-2, 21 oC), both in the same time range. The cactus was more efficient in reducing all average temperatures from 0:00 to 7:59h. In all strata, the cactus presented the highest RH averages, especially between 4:00 pm and 11:59 pm, with an increase of 8.45%. Regarding the growth or decrease trajectory, two scenarios were analyzed with the following expectation: (I) 8:00 am to 3:59 pm, lower average temperature increase; and (II) 4:00 pm to 7:59 am, greater average temperature reduction. Grass showed lower average temperature variations while cactus showed better results in RH variations. In the results of precipitation interference in internal and external temperatures, it is evident that the greater the precipitation, the lower the temperature, where for the study period the negative correlation (while one variable increases, the other decreases) was -0.27. For hydrological performance, the experiment that lasted 3 hours comprised: filling the reservoir, sprinkling for 5 minutes, control of water inlet/outlet. For the variables water retention, flow delay, and flow velocity, the experiment with cactus presented the best results, with emphasis on the retention capacity in the dry (A) 96% and saturated (B) 62% scenarios. This research proves the thermal and hydrological efficiencyof ecological roofs in relation to the conventional one, contributing to the diffusion of the technique in humid tropical climates.

BANKING MEMBERS:
Interno - 2726911 - ANDERSON LUIZ RIBEIRO DE PAIVA
Externa à Instituição - CRISTIANE GUISELINI - UFRPE
Interno - 1130841 - JAIME JOAQUIM DA SILVA PEREIRA CABRAL
Externo à Instituição - RONALDO LOPES RODRIGUES MENDES - UFPA
Presidente - 1528736 - SYLVANA MELO DOS SANTOS