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Frost Formation on An Air-Cooler and characteristics in Heat Pump System

Research Project

Project/Area Number 61550154
Research Category

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

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

Principal Investigator

HAYASHI Yujiro  FACULTY OF TECHNOLOGY, KANAZAWA UNIV., 工学部, 教授 (30019765)

Co-Investigator(Kenkyū-buntansha) TADA Yukio  FACULTY OF TECHNOLOGY, KANAZAWA UNIV., 工学部, 助手 (20179708)
AOKI Kazuo  TECHNOLOGICAL UNIVERSITY OF NAGAOKA, 工学部, 助教授 (60115095)
TAKIMOTO Akira  FACULTY OF TECHNOLOGY, KANAZAWA UNIV., 工学部, 助教授 (20019780)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsHEAT PUMP / FINNED TUBE TYPE HEAT EXCHANGER / FROST FORMATION / システム動特性 / 除霜 / 最適運転条件
Research Abstract

Frost formation on a cold surface is an inherent feature for air coolers operating under low temperature circumstances, and is also anegative phenomenon from the standpoint of thermal efficiency. In order to develop high-performance heat pump system, the following fundamental problems should be studied: (1) the characteristic of heat exchanger operating with frost formation, (2)the characteristic of heat-pump system, in which a heat exchanger is include as a compo-site element. In last year, analytical studies were performed mainlyfor the second problem by using a simple frost formation model. In this year, the first problem will be discussed experimentally and theoretically as a basic study to pursue the optimum design and operating conditions for heat exchangers. Namely, the effect of frost deposition on heat and mass transfer for each row and pressure loss were investigated using a four rows finned tube type heat exchanger. The growth of a frost layer was found to depend on the location of the row because of the decrease in water vapor concentration toward the direction of air flow. The efficiency of heat transfer for each row and the pressure loss in the heat exchanger were predicted in relation with the growth of a frost layer for each row. By this prediction, it was found that the performance of heat exchanger operating in counter flow type was higher in comparison with that in parallel flow type, because of a denser structure and a uniform deposition of frost layer on the surface of the heat exchanger.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 青木ほか: 日本機械学会論文講演集. 87-935B. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 林勇二郎: 冷凍. 63-726. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 青木ほか: 第24回日本伝熱シンポジウム講演論文集. 537-539 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 林,滝本,多田: 日本伝熱研究会,北陸信越グループ講演会. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.AOKI, et al.,: "The Difference in Characteristics between Parallel and Counter Flow Type Heat Exchangers with Frosting" Trans. of JSME,. 87-0935B. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Y. HAYASHI: "Frost Formation in Air Cooler" Refrigeration. 63-726. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.AOKI, et al.,: "A Study of Extended Surface Heat Exchanger with Frosting (3rd Report, Analysis of the Performance on Heat Exchanger)" Proc. of 24th National Heat Transfer Symposium of Japan. 537-539 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Y.HAYASHI, A.TAKIMOTO, Y.TADA: "Frost Formation on An Air-Cooler and Characteristics in Heat Pump Systems Research Meeting of Heat Transfer Society of Japan," Hokuriku-Shinetsu Group. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 林勇二郎: 冷凍. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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