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AUGMENTATION OF DEFROSTING BY USE OF ACTIVATION PHENOMENON OF ICE CRYSTAL WITH IRRADIATED INFRARED RAYS

Research Project

Project/Area Number 06650249
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

INABA Hideo  OKAYAMA UNIV., MECH.ENGNG., PROFESSOR, 工学部, 教授 (40133805)

Co-Investigator(Kenkyū-buntansha) OZAKI Koichi  OKAYAMA UNIV., MECH.ENGNG., INSTRUCTOR, 工学部, 助手 (20224206)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsFrost Layr / Melting / Infrared Rays / Ice Crystal / Absorptance / Melted Water / Frost Formation / Defrost
Research Abstract

It cannot be avoided the frosting problem for the heat exchanger whose temperature is below 0゚C.In general, some frost melting methods have been used such as the hot gas defrost in the reverse refrigerating cycle. However these methods have many problems. For cxample, it has the economical disadvantage owing to the small ratio of only 20 % of the energy consumed to melt the frost layr to total energy supplied during the defrosting, and it requires longer time to restart the cooling operation. The present research is useful to establish the new energy-saving defrosting method by using of the radiant heat energy. The optimum radiative wavelength range is the infared one for the radiative absorption of the frost layr.
The reflector and the bulb of the halogen heater increase the radiant heat intensity of the long wavelength range because it is coated with the alumina ceramics infrared ray radiation. It solves the radiative heat source problem. This radiative heat source makes the frost layr possible to absorb a great part of the radiant heat, as the result, the heat-loss of heating the heat exchanger decreases extremely. Accordingly the defrosting method proposed in the present research is epoch-making one for the refrigeration system requiring defrosting operation. Furthermore, the radiative heat source is also used for defrost by means of the frost sublimation.
The present rescarch is to investigate the effect of the radiative wavelength range, radiant heat intensity on defrost process. Moreover, it is also investigated that the radiative heat source of the defrost by means of the frost sublimation. The defrost method proposed in this research makes the defrost operation efficiently and systematize this kind of the defrost method.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Hideo INABA: "Sublimation Characteristics of Horizontal Frost Layer in Forced Cohvection" International Conference on Fluid and Thermal Energy Conversion '94. Vol.1. 215-220 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 稲葉英男: "放射熱による霜層の昇華蒸発促進効果" 第32回日本伝熱シンポジウム講演論文集. 175-176 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 稲葉英男: "昇華蒸発現象を利用した除霜に関する基礎研究(第2報 強制対流下にさらされた水平霜層に放射熱エネルギを照射した場合の昇華蒸発挙動)" 日本機械学会論文集(B編). 61-586. 2261-2268 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA: "Thermal Radiation Properties ofa Frost Layer" The Fourth Asian Thermophysical Properties Conference. Vol.1. 181-184 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 稲葉英男: "水平霜層の昇華蒸発現象に関する実験整理法" 空気調和・衛生工学会論文集. No.60(掲載予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA and Seishi IMAI: "Sublimation Characteristics of Horizontal Frost Layr in Forced Convection" International Conference on Fluid and Thermal Energy Conversion '94. Vol.1 (December). 215-220 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA and Seishi IMAI: "Enhancement of Sublimation of Frost Layr by Radiant Heat" 32nd National Heat Transfer Symposium of Japan (in Japanese). 175-176 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA and Seishi IMAI: "Study on Defrosting by means of Sublimation Phenomenon (2nd Report, Sublimation Phenomenon of a Horizontal Frost Layr Exposed to Forced Convection Air Flow and Radiant Heat)" Transaction of the Japan Society of Mechanical Engineering, Series B (in Japanese). 61-586. 2261-2268 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA Seishi IMAI and Hideo OTAKE: "Thermal Radiation Properties of a Forst Layr" The Fourth Asian Thermophysical Properitcs Conference. Vol.1. 181-184 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA and Seishi IMAI: "Date Reduction on Sublimation Phenomenon of a Horizontal Frost Layr Exposed to a Moist Air Flow" Transactions of the Society of Heating, Air-Conditioning and Sanitary Engineering of Japan (in Japanese). (Accepted Publication). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hideo INABA: "Sublimation Characteristics of Horizontal Frost Layer in Forced Convection" International Conference on Fluid and Thermal Energy Conversion '94. Vol.1. 215-220 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 稲葉英男: "放射熱による霜層の昇華蒸発促進効果" 第32回日本伝熱シンポジウム講演論文集. 175-176 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 稲葉英男: "昇華蒸発現象を利用した除霜に関する基礎研究(第2報,強制対流下にさらされた水平霜層に放射熱エネルギを照射した場合の昇華蒸発挙動)" 日本機械学会論文集(B編). 61-586. 2261-2268 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hideo INABA: "Thermal Racliation Properties of a Frost Layer" The Fourth Asian Thermophysical Properties Conference. Vol.1. 181-184 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 稲葉英男: "水平霜層の昇華蒸発現象に関する実験整理法" 空気調和・衛生工学会論文集. No.60(掲載予定). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 稲葉英男: "赤外線を熱源とした霜層の融解現象" 日本機械学会論文集. (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] 稲葉英男: "昇華蒸発を利用した除霜に関する研究" 日本冷凍協会論文集. (発表予定).

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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