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Elucidation of the frost growth process by means of the heat and mass transfer analysis bases on the frost micro structure measurement by using X-ray micro CT

Research Project

Project/Area Number 18K03994
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionKansai University

Principal Investigator

RYOSUKE MATSUMOTO  関西大学, システム理工学部, 教授 (50268314)

Co-Investigator(Kenkyū-buntansha) 小田 豊  関西大学, システム理工学部, 准教授 (50403150)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2018: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords霜 / 氷結晶 / X線マイクロCT / 3次元微細構造 / 熱物質輸送 / 3次元構造 / 着霜 / 霜結晶 / X線μCT
Outline of Final Research Achievements

Frost formation on the heat exchangers of the air conditioning equipment causes the serious energy loss, thus the anti-frost formation technique is the urgent task. The purpose of this study is to clarify the frost growth process by estimating the relationship between the frost-crystal micro structure and the heat-mass transport phenomena in the frost layer. The three-dimensional microstructure of the frost crystal was measured using X-ray micro CT, and the effect of the cooling surface properties on the crystal structure was evaluated. Furthermore, the combined heat conduction of ice crystals and moist air in the frost layer was analyzed using the measured three-dimensional microstructure data. The surface temperature of the frost layer rises as the frost layer grows, while the temperature of the bottom of the frost layer decreases. As a result, ice crystals at the bottom of the frost layer grow by the water vapor supplied from the sublimation in the frost layer.

Academic Significance and Societal Importance of the Research Achievements

空調機器の暖房運転において室外機の熱交換器で着霜が生じると,機器のエネルギー効率が30%近く低下することが報告されており,熱交換器の耐着霜の技術開発は重要な課題である.本研究は,霜結晶構造と霜層内の熱物質輸送との関係の解明により,霜成長過程を明らかにすることを目的とし,耐着霜性能を有する伝熱面の微細構造や表面処理性状の開発につながる基礎研究として位置づけられる.本研究結果により,はっ水性の冷却面表面では霜形成初期の氷滴の形成に影響し,霜結晶密度が疎となることが示された.さらに,氷結晶と湿り空気の複合熱伝導を解析した結果,霜層内の水蒸気輸送が霜層の発達に影響することが明らかとなった.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (3 results)

  • [Journal Article] Effect of Cooling Surface Properties on Frost Layer Microstructure2020

    • Author(s)
      松本 亮介、西浦 雄人、塩川 貴大、槇原 拓郎、小田 豊、清水 智弘、依岡 拓也、荒木 拓人
    • Journal Title

      Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers

      Volume: 37 Issue: 4 Pages: 431

    • DOI

      10.11322/tjsrae.20-20_EM_OA

    • NAID

      130008138394

    • ISSN
      1344-4905, 2185-789X
    • Year and Date
      2020-12-31
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Meltwater Behavior During the Defrosting Process By Using X-ray Radiography2020

    • Author(s)
      松本 亮介、塩川 貴大、西浦 雄人、小田 豊、伊藤 大介、齊藤 泰司
    • Journal Title

      Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers

      Volume: 37 Issue: 3 Pages: 249

    • DOI

      10.11322/tjsrae.20-19_EM_OA

    • NAID

      130008093769

    • ISSN
      1344-4905, 2185-789X
    • Year and Date
      2020-09-30
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 霜層微細構造に及ぼす冷却面性状の影響2020

    • Author(s)
      西浦雄人,松本亮介,塩川貴大,清水智弘,依岡拓也,荒木拓人
    • Journal Title

      日本冷凍空調学会論文集

      Volume: -

    • NAID

      130008138394

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] プレートフィンチューブ熱交換器での除霜時の融解水挙動2020

    • Author(s)
      松本 亮介,槇原 拓郎,伊藤 大介,齊藤 泰司
    • Organizer
      日本冷凍空調学会2020年度年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 霜層微細構造に及ぼす表面性状の影響2019

    • Author(s)
      西浦雄人,松本亮介,塩川貴大,清水智弘,依岡拓也,荒木拓人
    • Organizer
      2019年度日本冷凍空調学会年次大会講演論文集
    • Related Report
      2019 Research-status Report
  • [Presentation] X 線μCT を用いた霜層微細構造における表面性状の影響2019

    • Author(s)
      西浦 雄人,松本 亮介,長澤 佳輝,塩川 貴大,清水 智弘
    • Organizer
      日本機械学会関西支部定時総会講演会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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