Abstract
The objectives of this study were to evaluate the thermal comfort and the similitude between prototypes and reduced models, using non-conventional coverage with green roof and expanded clay aggregate, supported on wood frame structure. For this, were determined the Black Globe Temperature and Humidity Index (BGHI), the Human Discomfort Index (HDI), Effective Temperature (ET), Air Temperature (Tair) and Radiant Thermal Load (RTL), from March 2013 to December 2014. The results showed that there were no statistical differences to 5% significance in predicting heat indices between the prototypes and models. Observing all indexes simultaneously, it was observed that January was the month what led to the worst heat conditions, while June and July showed the worst cold conditions. It can be concluded that the use of reduced models is possible (1:2) compared to the prototype (1:1), with green roofs and expanded clay as covering element, for the prediction of thermal indexes, minimizing construction costs and use of spaces.
Highlights
In tropical regions there is almost constant occurrence of temperatures above the thermo neutral environment of humans and animals, this causes an increase in energy demand for air cooling besides environmental impacts for its generation.The roof is one of the constructive components with the greatest influence on the conditions of the internal environment of a building (Cardoso et al, 2011)
In order to compare the coverages and the similitude criteria, two prototypes were constructed in natural scale (1:1) and two models in reduction scale (1:2), geometrically similar model class (Murphy, 1950), supported in Wood Frame structure
According to the SINAT Directive 005 (Ministry of Cities - National Secretariat of Housing, 2011), the Wood Frame System has as main characteristic to be structured by pieces of solid cut lumber, denominated frames and closings in thin plates, providing structural support for the coverage, producing a quick and lightweight construction system
Summary
In tropical regions there is almost constant occurrence of temperatures above the thermo neutral environment of humans and animals, this causes an increase in energy demand for air cooling besides environmental impacts for its generation. The roof is one of the constructive components with the greatest influence on the conditions of the internal environment of a building (Cardoso et al, 2011). The building high cost on a natural scale for the knowledge of new technologies often makes research impossible to be conducted. In this sense, the use of reduced models allows to test several configurations in a more agile way, with reduction of the constructive costs and space. This is a widely used tool in engineering, but its application requires that reduced models and prototypes behave significantly equal
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