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Author(s): Muhammad Amir Aisar Khalid, Yasuo Katoh, Hiroshi Katsurayama, Makoto Koganei, Makoto Mizunuma, Yusuke Awata, Muhammad Wafiyuddin Amin Senin
Pages: 1-14 Paper ID:172506-8484-IJCEE-IJENS Published: December, 2017
Abstract:-- Green roof technique has been introduced as a mitigation approach towards urban heat island (UHI) occurrence since a few decades ago. Since there was very little literature on the usage of moss in green roof implementation available, this paper establishes the thermal performance of Sunagoke (Racomitrium Canescens) moss green roof in addressing UHI effect. As the evaluation conditions, the thermal performance of Sunagoke moss green roof was investigated quantitatively through indoor and outdoor experiments. Indoor experiments were performed inside the artificial climate chamber with the ambient temperature and humidity fixed at 30 °C and 70% RH, respectively, while the irradiance strength and wind velocity were altered as the investigation parameters. Meanwhile, outdoor experiments were piloted at Yamaguchi University main office building rooftop, consisting of the uncontrollable natural environment. As the test candidates, a model house with 3mm of Sunagoke mat and control model house were utilized in the indoor and outdoor experiments. Besides, model houses with 30mm of Sunagoke mat and grass were added as comparison candidates in outdoor experiments. In outdoor experiments, all green roofs displayed better convection heat transfer coefficient than the control roof; however, the thinnest Sunagoke had the best ability to release heat compared to other competitors. The albedo was not affected by wind velocity but irradiance strength, noting 0.25, 0.22, 0.22, and 0.24 for model houses Sunagoke 3mm, Sunagoke 30mm, grass, and control, respectively. The 30mm thickness Sunagoke moss did not deliver heat as good as 3mm Sunagoke moss and 25mm grass in term of convection heat, but the suppression of interior temperature was the most superior. Despite the absence of soil, both Sunagoke moss green roofs showed decent insulation effect and provided thermal relaxation comparable to grass.
Keywords: Sunagoke moss green roof, convection heat transfer, thermal performance, interior temperature.
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