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Study on Mechanism and Prevention of Thermal Discomfort Caused by Cold Outdoor Air through Supply Opening on the Wall (In the Case of Residence with various kind of Heating System)

Research Project

Project/Area Number 11450213
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Architectural environment/equipment
Research InstitutionTohoku University

Principal Investigator

YOSHINO Hiroshi  Tohoku University, Graduate School of Eng., Professor, 大学院・工学研究科, 教授 (30092373)

Co-Investigator(Kenkyū-buntansha) MOCHIDA Akashi  Tohoku University, Graduate School of Eng., Associate Professor, 大学院・工学研究科, 助教授 (00183658)
MATSUMOTO Shin-ichi  Akita Prefectural University, Faculty of Systems Science and Technology, Professor, システム科学技術学部, 教授 (70209633)
UTSUMI Yasuo  Miyagi National College of Technology, Department of Architecture, Professor, 建築学科, 教授 (30168728)
SATO Hiroshi  Tohoku University, Graduate School of Eng., Lecturer, 大学院・工学研究科, 講師 (10260423)
KOBAYASHI Hiroshi  Miyagi National College of Technology, Department of Architecture, Lecturer, 建築学科, 講師 (80280329)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥12,600,000 (Direct Cost: ¥12,600,000)
KeywordsCold draft / Supply opening / Questionnaire Survey / Field measurement / Experimental study / Numerical simulation / Temperature distribution / Thermal Discomfort
Research Abstract

The research had been carried out since 1999 until 2000. The results obtained are as follows :
(1) Questionnaire surveys The questionnaire survey of 86 residential buildings in the Kanto, Tohoku and Hokkaido district was carried out. More than half of residential buildings in the Tohoku and Hokkaido district have a problem of cold draft due to outdoor air, and then about 30% of them the occupant sometimes close their air inlets.
(2) Field measurement in residential buildings In three residential buildings what installed mechanical exhaust system, measurement of air tightness, air exchange rate, air distribution and temperature distribution near inlet were carried out. Cold air infiltration was found in two residences.
(3) Investigation on the air inlet Various inlets used inside and outside Japan were investigated and classified. Performance test of nine inlets were examined by using standard type small size wind tunnel. Information of inlet mechanism was documented.
(4) Real scale experim … More ent using environmental chamber A real scale experiment in environmental chamber was carried out. The results are as follows, (1) The standardized vertical temperature difference is affected by the airflow directions from the supply opening. The highest value is observed for horizontal flow with maximum vertical temperature difference. The value increases in the flow directions of "vertical upward with an angle", "radial outward parallel to wall", "radial outward with an angle from wall", "horizontal outward from wall", sequently. (2) The standardized vertical temperature difference was examined in terms of various opening positions. The value of the difference decrease in the case of inlet installed above the window, in the upper, in the middle, in the lower of the wall sequently. (3) The influence of supply air velocity on vertical temperature difference was not significant.
(5) Numerical analysis A full size room was adopted as the numerical model geometry. The standard k-ε model was used for the numerical simulation. Numerical result was compared with experiment, and accuracy was discussed. Furthermore, from the view points of air exchange efficiency and thermal comfort, air flow direction was also discussed. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 李振海,吉野博: "戸建て住宅の換気システム並びに外壁給気口の熱環境に及ぼす影響に関するアンケート調査"空気調和・衛生工学会論文集. 77. 109-115 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 李振海,吉野博,内海康雄(外4名): "外壁給気口からの冷気侵入による温熱不快感の形成機構の解明とその防除に関する研究その1実験室の概要と室内温度分布の測定"日本建築学会東北支部研究報告集計画系. 63. 245-248 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 李振海,吉野博,内海康雄(外4名): "外壁給気口からの外気導入による室内温度分布の形成に関する実験的研究"日本建築学会大会学術講演梗概集. 2000・D-II. 109-110 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zhen-hai Li and Hiroshi Yoshino: "Questionnaire Survey Related with the Influence of the Air Outlet on the Thermal Environment in Single Family House"TRANSACTIONS OF THE SOCIETY OF HEATING, AIR-CONDITIONING AND SANITARY ENGINEERS OF JAPAN. Vol.77. 109-115 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zhen-hai Li, Hiroshi Yoshino, Yasuo Utsumi, Hiroshi Kobayashi, Yukio Sakaba, Kenkou Mushya and Nobuyuki Iwai: "A Studies about thermal Discomfort due to Outdoor Cold Air Coming Through the Air Outlet Installed on the Outside Wall, Part 1. Outline of Laboratory and Measurement of the Interior Temperature Distribution"SUMMARIES OF TECHNICAL PAPERS OF ANNUAL MEETING TOHOKU BRANCH ARCHITECTURAL INSTITUTE OF JAPAN. Vol.63. 245-248 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zhen-hai Li, Hiroshi Yoshino, Yasuo Utsumi, Hiroshi Kobayashi, Yukio Sakaba, Kenkou Mushya and Nobuyuki Iwai: "Experimental Study on Interior Temperature Distribution caused by Outdoor Cold Air Entering Air Outlet Installed in Outside Wall"SUMMARIES OF TECHNICAL PAPERS OF ANNUAL MEETING ARCHITECTURAL INSTITUTE JAPAN. Vol.2000 D-II. 109-110 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 李振海,吉野博: "戸建て住宅の換気システム並びに外壁給気口の熱環境に及ぼす影響に関するアンケート調査"空気調和・衛生工学会論文集. 77. 109-115 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 李振海,吉野博,内海康雄 (外4名): "外壁給気口からの冷気侵入による温熱不快感の形成機構の解明とその防除に関する研究 その1実験室の概要と室内温度分布の測定"日本建築学会東北支部研究報告集計画系. 63. 245-248 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 李振海,吉野博,内海康雄 (外4名): "外壁給気口からの外気導入による室内温度分布の形成に関する実験的研究"日本建築学会大会学術講演梗概集. 2000・D-II. 109-110 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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