Dynamic insulation system applied to window frame: Basic performance evaluation using experimental house under real environment

Kyosuke Hiyama, Daisuke Kawahara, Shinsuke Kato, Sihwan Lee, Yutaka Oura, Katsuhiko Mori, Yoshikazu Nomura, Satoshi Nikawa, Junichi Tezuka

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)435-441
Number of pages7
JournalJournal of Environmental Engineering (Japan)
Issue number699
Publication statusPublished - May 2014


All Science Journal Classification (ASJC) codes

  • Environmental Engineering

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