The Thermal Influence of Envelopment in Naturally Ventilated Environments

Marlon Sérgio Manthay Oliveira

Izabela Oliveira Hofman

Edna Aparecida Nico-Rodrigues

Cristina Engel de Alvarez

ABSTRACT: Motivated by the increase of 42% on average in Brazilian demand for electricity in the period 2003-2013, due to population growth that reached 12.3% since the year 2000, it has become a priority the adoption of improvements in construction, especially seeking thermal efficiency. More efficient buildings have as targets the intervention and identification of solutions on the project stage, such as the choice of materials with different thermal characteristics and direct relationship in thermal performance. The study aimed to analyze the influence of envelopment materials for the thermal performance of university educational building located in a tropical and humid climate, with the prerogative of the use of natural ventilation as a strategy to improve the comfort, according parameters of Frequency Thermal Discomfort (FDT-%) and Degrees hours of Thermal Discomfort (GhDT-°C.h), seeking the least energy expenditure and promote buildings suitable for the environment. There were made three methodological steps with the 1st on the review of the key concepts work; the 2nd descriptive experimental research simulation with DesignBuilder software; and 3rd of results analysis. Among the results, it was observed that the analyzed environments are all uncomfortable especially the located on the upper floor, with an increase in rates of FDT and GhDT, pointing great interference in thermal gains through the roof, intensified by the impossibility of heat exchange ventilation by night, due to the frames models, which did not allow air circulation, so being required artificial conditioning and required specification of more efficient materials.

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