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Spatial Distribution of Internal Temperatures in a LGR （Light Green Roof） for Brazilian Tropical Weather

Journal of Civil Engineering and Architecture 2014年第6期8卷 699-708页

作者： grace tibério cardoso de seixas francisco vecchia School of Engineering of Sao Carlos University of Sao Paulo Sao Carlos 13566-590 Brazil

This article aims to assess the spatial distribution of the IST (internal surface temperatures) in the ceiling and DBT (dry bulb temperatures) of a LGR (light green roof) in a test cell. Cover systems known as green roofs have the potential to retain rainwater and help reduce runoff. However, the characteristic considered in this work is the insulation capacity of this kind of coverage. To evaluate the spatial distribution of temperatures in an environment with light green roof, we proposed a new method for acquisition of series of climatological data and temperatures according to spatial and temporal approaches of dynamic climatology. Climatological data were provided by an automatic weather station and temperatures were collected in a test cell with light green roof. The spatial distribution of surface temperatures and internal air temperature (DBT) are based on the concepts of a climatic episode and typical experimental day from the study of the dynamic climatology. The results led to the conclusion that the light green roof has a balanced spatial distribution of the IST and of the internal air temperature (DBT), i. e., without substantial variations over the day. The new methodology also showed the importance of specifying the location of the sensors and automatic weather station in experimental studies on the thermal behaviour of buildings.

关键词：绿色屋顶空间分布内部温度热带天气内表面温度自动气象站巴西气候资料

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Comparison of thermal performance between test cells with different coverage systems for experimental typical day of heat in Brazilian Southeastern

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Frontiers of Architectural Research 2014年第3期3卷 271-282页

作者： grace tiberio cardoso francisco vecchia Graduate Program in Environmental Engineering Sciences University of Sao Paulo Rua Borges Lagoa94 apto 73 Sao Paulo 04038-000 Brazil

This article shows experimentally the thermal performance of two test cells with different coverage systems, Ught Green Roof （LGR） and ceramic roof by analyzing internal surface temperatures （IST） in the ceiling and dry bulb temperatures （DBT）. The objective was to evaluate the spatial distnbution of temperatures in buildings according to spatial and temporal Dynamic CUmato[ogy approaches. An experimental, typical day for heat conditions was determined. The data of the main climatic vari- ables provided by an automatic weather station and temperatures inside the test cells were collected using thermocouples installed such that the entire space is included. The results led to the conclusion that the LGR has a balanced IST and DBT spatial distribution compared with ceramic roofs. Nevertheless, the analysis of the thermal performance is only one of the variables that must be considered when developing a construction proposal that is adapted to the context. The manner in which the thermocouples were placecl inside the test cells also showed the importance of specifying the location of the sensors in experimental studies on the behavior and thermal performance of buildings.

关键词： Light Green Roof(LGR) Thermal perfor-mance Dynamic Climatology Internal tempera-tures Spatial distribution Experimental typicalday

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Rigid foam polyurethane （PU） derived from castor oil （Ricinus communis） for thermal insulation in roof systems

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Frontiers of Architectural Research 2012年第4期1卷 348-356页

作者： grace tiberio cardoso Salvador Claro Neto francisco vecchia Engineering School of sao Carlos University of Sao Paulo Sao Carlos Brazil Chemistry Institute of Sao Carlos University of Sao Paulo Sao Carlos Brazil

This paper discusses the response of the thermal insulation Lining of rigid foam potyurethane （PU） derived from castor oil （Ricinus communis） in heat conditions, based on dynamic climate approach. Liners have been widely used, because the coverage of buildings is responsible for the greatest absorption of heat by radiation, but the use of PU foam deMved from this vegetal oil is unprecedented and has the advantage of being biodegradable and renewable. The hot wire paraLleL method provided the thermal conductivity vatue of the foam. The thermo- gravimetric analysis enabled the study of the foam decomposition and its Lifetime by kinetic evaLuation that involves the decomposition process. The PU foam thermal behavior analysis was performed by coLlecting experimental data of internal surface temperature measured by thermocouples and assessed by representative episode of the climatic fact. The results Lead to the conclusion that the PU foamderived from castor oit can be applied to thermat insulation of roof systems and is an environmentaLLy friendly materiaL.

关键词： Rigid foampolyurethane Ricinus communis Biodegradable Thermal behavior Heat insulation in roofsystems

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Influence of Global Solar Radiation on Indoor Environment： Experimental Study of Internal Temperature Distribution in Two Test Cells with Different Roof Systems

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Journal of Civil Engineering and Architecture 2015年第1期9卷 28-37页

作者： grace tiberio cardoso de seixas francisco vecchia School of Engineering of S~o Carlos University of S~o Paulo S~o Carlos 13566-590 Brazil

This work is part of a large experimental study on the distribution of internal temperatures in two similar test cells, but with different systems of coverage. The main goal of this paper is to present results on an experimental field to determine the influence of solar radiation on the internal environmental conditions of different roof systems. Dry bulb temperature and internal surface temperatures were measured in two test cells with different roof systems (green roof and conventional ceramic roof). Their thermal performances were compared on days with differing air mass domain, based on dynamic climatic approach. This research was based on the spatial and temporal approaches of dynamic climatology, from the climatic regime of the city of Itirapina, S?o Paulo State, analysed as representative episodes. Climatic data were provided by an automatic weather station and verified by satellite imagery, and the internal temperatures of the cells were collected by thermocouples installed on the surfaces of ceilings, floors, walls, and suspended inside the buildings. The results indicate that the solar radiation is mainly responsible for the great variations in temperature and its impact on indoor environments, since there were great differences in temperature inside comparing the two days of the experiment. This refutes the notion that the outside temperature is responsible for daily variations in temperature inside buildings.

关键词：内部温度分布屋面系统室内环境测试单元比较实验太阳总辐射内表面温度气候数据

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