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The expansion of social housing in Brazil is solving the great demand among low-income populations. However, these projects are not considering climatic factors and thermal comfort strategies. There is a standardization of architectural projects, which leads to the user discomfort. Bioclimatic solutions that improve the thermal performance of buildings should be valued in the projects of buildings. This paper presents a comparative study noticing the thermal comfort provided by a earth tube ventilation system with a natural ventilation system based in the opening of the windows. In this study, three Brazilian bioclimatic zones defined by NBR (Brazilian Standard) 15220 (2005), Zone 1 (Curitiba), 2 (Camaqua) and 7 (Cuiaba), were considered. To make this comparison, computer simulation was used to observe the thermal confort conditions in RTQ-R (Quality Technical Standard for Energy Efficiency Level in Residential Buildings) (2010), with the help of Energy Plus software and Schektch Up with the plug in Open Studio for modeling the residence. After the energy modeling, the results were analyzed with the Analisys Bio software in order to obtain the percentage of hours of comfort for the year (8,760 h). The conclusion is drawn that the natural ventilation strategy with the opening and closing of the windows is more efficient in Bioclimatic Zone 1. For the Bioclimatic Zone 2, the earth tubes should be used only in the summer and, in Bioclimatic Zone 7, earth tubes are efficient throughout the year because of the high temperatures in the exterior environment.

Evaluation of Thermal Comfort Level in Social Interest Housing with Earth Tubes for the Brazilian Bioclimatic Zones 1, 2 and 7