Abstract
The objective of this study was to analyze a green roof by monitoring the variables that can influence it, comparing its effects to those of a conventional roof with clay tiles in Cascavel/State Parana. The following parameters were compared in both prototypes: indoor temperature, outdoor temperature, relative humidity, wind speed and solar radiation. Temperature measurements were determined by sensors installed in the prototypes whereas the relative humidity was analyzed by wet bulb sensors. Data concerning to 30 days of experiment were collected and tabulated in Microsoft Excel. The green roof remained for 7 days within the relative humidity range considered comfortable whereas the conventional roof remained for 4 days. The green roof caused a mean reduction of 4.96°C, proving that green roofs contribute to reducing indoor room temperature and thermal lag promoted by the green cover, where the heat input takes longer to occur when compared to the conventional roof. Regarding the behavior of the vegetation cover and substrate, the larger the green cover, the lower the substrate temperature transmitted to the indoor environment.
Highlights
For being warmer than the rural areas that surround them, cities suffer from a phenomenon known as urban heat islands (Li, Bou-Zeid, & Oppenheimer, 2014)
When analyzing the relationship between the substrate temperature and the indoor temperature of the green roof prototype, it was observed that the substrate temperature has a direct relationship with the indoor temperature, that is, the higher the substrate temperature, the higher the indoor temperature
When analyzing the relationship between the temperature on the surface of the grass and the indoor temperature of the green roof prototype on the Conclusion The experiment with green roof showed the relative humidity inside the comfort range (40 and 60%) for seven (07) days, whereas the conventional roof showed it for four (04) days
Summary
For being warmer than the rural areas that surround them, cities suffer from a phenomenon known as urban heat islands (Li, Bou-Zeid, & Oppenheimer, 2014). This phenomenon has been studied for decades and may be caused by many factors, such as the extensive use of asphalt and concrete in urban areas, which causes evapotranspiration reduction and higher heat concentration (Grimmond, 2007). Considering the increase in the world's urban population, urban heat islands have direct implications on energy issues and environmental health (Grimm et al, 2008) and have drawn more and more attention of scientists and planners.
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