The Research of Methods in Reducing Heat Transmission from Exterior Reinforced Concrete Walls - A Case Study of Buildings in Rural Areas of Taiwan
Date Issued
2009
Date
2009
Author(s)
Liu, Kang-Yin
Abstract
Residential buildings in rural areas of Taiwan are typically large detached houses, which are exposed to direct sunlight on their exterior walls as there are no surrounding buildings to block sunlight and create shade. Also the 12cm reinforced concrete exterior walls are the mainstream in Taiwan’s residential buildings, which has the property of high thermal conductivity that can easily make the thermal flow transfer indoors. So this research is under the premise of retaining the original exterior walls, from the design point of view to develop the methods of reducing heat transmission, and make on assessment of each model’s performance, thickness and economic viability. Through the understanding of theory and practical perspectives, the methods of reducing heat transmission from the exterior walls can be summed up as follows six methods: additional interior insulation layers, additional interior closed cavities, additional exterior insulation layers, outer surface painting, additional exterior closed cavities and additional exterior naturally ventilated cavities. The results showed that the additional interior insulation layers method and the additional interior closed cavities method could reduce the indoor heat gain by about 60%-80%; the additional exterior insulation layers method could reduce the indoor heat gain by about 70%-90%; the outer surface painting method could reduce the indoor heat gain by between 37% and 55%; the additional exterior closed cavities method can reduce the indoor heat gain by between 41% and 51%; and the additional exterior naturally ventilated cavities method could reduce the indoor heat gain by between 53% and 62%. When the purpose is to reduce the indoor heat gain by about 30%-50%, the outer surface painting method consists of the optimal models from the thickness point of view and the economy point of view; when the purpose is to reduce the indoor heat gain by about 60%, the additional interior insulation layers method consists of the optimal model from the thickness point of view and the additional interior closed cavities method consists of the optimal model from the economy point of view; when the purpose is to reduce the indoor heat gain by about 70%, the additional exterior insulation layers method consists of the optimal model from the thickness point of view and the additional interior insulation layers method consists of the optimal model from the economy point of view; when the purpose is to reduce the indoor heat gain by about 80%-90%, the additional exterior insulation layers method consists of the optimal models from the thickness point of view and the economy point of view.
Subjects
building energy conservation
thermal insulation of exterior walls
building rehabilitation
SDGs
Type
thesis
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