Abstract
Strengthening the roof insulation is the main method for improving the indoor thermal environment of rural buildings during summer. This study proposed a radiant barrier roof with a roof insulation structure based on climatic conditions in the Qinba Mountains and the characteristics of rural buildings, in which radiant barriers were installed on the underside of the roof in the attic space to enhance roof insulation. To study the thermal insulation performance of radiant barrier roofs, aluminum foil bubble composites were installed on the underside of the roof in the attic space in the Qinba Mountains, and comparative experiments were carried out. Based on the results, the average temperature of the second-floor bedrooms dropped by 1.1°C, thus proving the effectiveness of thermal insulation with radiant barrier roofs. The thermal insulation performance of radiant barrier roofs made of aluminum foil bubble composite was studied through numerical simulation analysis. Based on the findings of this study, radiant heat transfer contributed 65% to the thermal insulation effect when aluminum foil bubble composites were applied. Based on the analysis of thermal performance and cost, it is recommended to use radiant barrier materials with an emissivity of less than 0.3 and a thermal resistance of no more than 2 m2K/W. Furthermore, the application of radiant barrier roofs made of aluminum foil bubble composites can have a positive effect on thermal insulation during winter. This facilitates the widespread use of radiant barrier roofs for rural buildings throughout hot-summer/cold-winter zones.
Highlights
At present, energy consumption in buildings accounts for 36% of total energy consumption in China, while the area of rural buildings and residences is approximately three times that of urban residences [1, 2]
When the per capita income of villagers increases to a certain level as the economy grows, energy consumption in rural buildings will rise in a nonlinear manner, and the total energy consumption of rural buildings will exceed that of urban areas
Enclosure structures are an important factor affecting indoor thermal environments during summer. e roof is the main source of heat loss in the enclosure structure of buildings, constituting 70% of total heat loss, because roofs are exposed to solar radiation all day long [3,4,5]. erefore, it is especially important to strengthen roof insulation structures
Summary
Energy consumption in buildings accounts for 36% of total energy consumption in China, while the area of rural buildings and residences is approximately three times that of urban residences [1, 2]. Air temperature was measured using the TR-72U hygrothermograph, with a test accuracy of Radiant barrier roof Attic space
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