The thermal influence of envelopment in Naturally ventilated environments

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.