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Hiyama K.,Yamaguchi University | Kawahara D.,University of Tokyo | Kato S.,University of Tokyo | Lee S.,Tokyo University of Science | And 5 more authors.
Journal of Environmental Engineering (Japan) | Year: 2014

Although an insulation performance of a house is improving with rise of an environmental awareness, thermal performance of window frames is still low. The poor performance occur problems such as heat bridge or condensation. Then we propose to apply a dynamic insulation system to window frames. In previous study, we have done some feasibility studies using computer simulations. The results show that the system can decrease the heat loss to almost zero. In this study, we checked its performance using its prototype installed into an experimental house. The experimental house is located in Sapporo, Hokkaido. Through a measurement in winter, we prove that the system works even in cold climate. With a usual ventilation amount for a person, the outdoor surface temperature of the window frame becomes almost same as outdoor environmental temperature. It means the heat loss from window frame surface to outdoor is almost zero. Source


Yaegashi A.,University of Tokyo | Hiyama K.,Yamaguchi University | Kato S.,University of Tokyo | Tezuka J.,J Architecture System Inc | Nikawa S.,J Architecture System Inc
Journal of Asian Architecture and Building Engineering | Year: 2015

This paper presents the thermal performance evaluation of a dynamic insulation technology applied to the building envelope of a timber framework house. The concept of dynamic insulation technologies is to draw outside air in through insulation materials in a wall to recover conduction heat loss from inside the building. The authors applied dynamic insulation technology to the walls and ceiling of a timber framework house to allow outside air to pass through permeable insulation materials within the walls and ceiling. The experiment was conducted at a building in Sapporo, Hokkaido to evaluate the thermal performance of a building envelope with dynamic insulation technology in a real environment. The results showed that the dynamic insulation technology can significantly reduce heat loss through the building envelope. © 2015, Architectural Institute of Japan. All right reserved. Source

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