Case study on the actual design and operation of a radiant cooling and heating system in Japan

Yoh Miyashita*, Shinichi Tanabe, Eriko Kuzuu, Yoshiaki Ishii

*Corresponding author for this work

    Research output: Contribution to conferencePaperpeer-review


    A case study was conducted for the purpose of revealing the trends in use as well as the design and operation of radiant cooling and heating systems in buildings in hot and humid areas such as Japan. Documentary research was first conducted to reveal the trends. Next, questionnaires were given to facility engineers to determine attitudes toward the systems, as well as ideas and any problems in planning for and operating the systems. Facility engineers were also surveyed to collect information on existing installations of radiant ceiling systems, as well as detailed plans, design aims, and practical use conditions. It was revealed that water-based radiant cooling and heating systems account for about 70% of existing systems in Japan, and air-based or combined systems account for about 20% of this population. The main problems with integration of these systems are high initial costs and humidity regulation difficulties. In order to regulate humidity, a desiccant air-conditioning system was adopted in 13 out of the 17 cases. There are five general types of radiant systems. Also, the laying area rate of water-based systems is about 50-60%. On the other hand, for some air-based systems, the laying area rate is about 25%.

    Original languageEnglish
    Publication statusPublished - 2015 Jan 1
    EventHealthy Buildings Europe 2015, HB 2015 - Eindhoven, Netherlands
    Duration: 2015 May 182015 May 20


    OtherHealthy Buildings Europe 2015, HB 2015


    • Case study
    • Radiant cooling and heating system
    • Thermal comfort

    ASJC Scopus subject areas

    • Civil and Structural Engineering


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