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1998 Fiscal Year Final Research Report Summary

A new technique for measuring air change rates in indoor spaces using the step down method of video image signals

Research Project

Project/Area Number 09650657
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Architectural environment/equipment
Research InstitutionTokyo Institute of Polytechnics

Principal Investigator

OHBA Masaaki  Tokyo Institute of Polytechnics, Professor, 工学部, 教授 (90130947)

Project Period (FY) 1997 – 1998
KeywordsVideo image / Air change rate / Step down method / Cross-ventilation model / Test house
Research Abstract

Video camera calibrations, wind tunnel experiments and field experiments have been performed to develop a new method of measuring air change rates using a video imaging technique. The camera calibrations showed good correlation between image signals and luminous reflectance of achromatic color chips. This was achieved by appropriately adjusting the pedestal level of the video camera so that the image signals were made equal to zero for the black level of the picture. In the wind tunnel experiments, air obtained by the step down method assuming perfect mixing of tracer mists inside the spaces. The video image method could measure air change rates with an error of less than 9% of those by the tracer gas procedure using a high-speed hydrocarbon analyzer. In the field tests, air change rates in the test house with test space were also measured using smoke candles as tracers. It was verified that the video method could measure air change rates with virtually the same precision as derived from the decay curves of smoke particle concentrations using an aerosol monitor.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 大場: "環境風洞におけるビデオ画像計測手法の開発研究 その3 画像濃度減衰法による通風模型の換気回数の測定法について" 日本建築学会計画系論文集. 506. 25-30 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 入江, 大場: "ビデオ画像輝度値減衰法による実物建屋の換気回数の測定に関する開発研究 その1 換気回数の測定精度に及ぼすカメラ調整とトレーサーミストの影響について" 可視化情報学会誌. 18.1. 51-54 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 入江, 大場: "画像濃度減衰法による実物建屋の換気回数の測定法に関する研究" 日本建築学会大会学術講演梗概集. 621-622 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohba, M., Irie, K.: "A new technique for measuring air change rates in a cross-ventilation model using step down method of video image signals" Roomvent 98. 2. 453-460 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in indoor spaces using the step down methed of video image signals" Int, Conf.on optical technology and image processing in fluid, thermal and combaston flow. 212-213 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in a test house ustng video imaging" ASHRAE Transactions (印刷中). 1-7 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in a test house using video imaging" ASHRAE Transactions. 1-7 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in test house using the step down method of video image signals, Part 1. Study on effedcts on effects of camera adjustments and tracer mists on measurement accuracy of air change rates" J.Visualization Society of Japan. 18(1). 51-54 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in a cross-ventilation model using step down method of video image signals" Roomvent '98. 2. 543-460 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohba, K.Irie: "A new technique for measuring air change rates in indoor spaces using the step down method of video image signals" VSJ-SPIE '98. 212-213 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Irie, M.Ohba: "A new technique for measuring air change rates in a test house using the step down method of video image signals" Summaries of technical papers of annual meetings of AIJ. 621-622 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ohba, K.Irie: "Studies on instrumentation technology of video image in wind tunnel for environmental researches Part 3 Measurement of air change rates in a cross-ventilation model using the step down method" Transactions of AIJ. 506. 25-30 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Irie, M.Ohba: "Study on effects of experimental conditions on measurement accuracy of air change rates in a cross-ventilation model using step down method of video image signals" J.Visualization Society of Japan. 17(1). 175-178 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Irie, M.Ohba: "Techniques for measuring air change rates in a cross-ventilation model using video images, Part 2. Effect of photography and emission conditions on video images" Summaries of technical papers of annual meetings of AIJ. 605-606 (1997)

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      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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