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Development of energy conversion system of highly concentrated solar energy transmitted by an optical fiber

Research Project

Project/Area Number 08555050
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Thermal engineering
Research InstitutionTohoku University

Principal Investigator

NAITO Hitoshi (1997)  Tohoku University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (40270813)

嵐 治夫 (1996)  東北大学, 工学部, 教授 (80006155)

Co-Investigator(Kenkyū-buntansha) OKA Toshiharu  Ishikawajimaharima Heavy Industry, Co.Ltd, Researcher, 研究員
YUGAMI Hiroo  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60192803)
SAITOH Takeo  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (80064161)
内藤 均  東北大学, 工学部, 助手 (40270813)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1997: ¥5,400,000 (Direct Cost: ¥5,400,000)
KeywordsSolar Energy / Optical Fiber / CPC / Solar Energy Transmission / Concentrated Solar Energy / 高密度太陽エネルギー / 放物面集光鏡
Research Abstract

The solar energy concentration system, coupled with an optical fiber, enables us to use highly concentrated solar energy at the desired place regardless of the position of a solar concentrator. We can use it as a heat or light source. This system is also useful for space applications. However, solar energy density decreases from at the end of the optical fiber according to its numerical aperture. To overcome this problem, we are investigating the CPC (Compound Parabolic Concentrator)coupled to the exit of an optical fiber. This method is capable of increasing the solar energy density.
We have constructed the system, which was composed of the auto-tracking parabolic concentrator, the optical fiber bundle, and the CPC.A heat flux was measured and transmission efficiency was evaluated. The transmission efficiency distribution in the optical fiber was not uniform and was very low compared to the theoretical one. It was due to the degradation of the surface and edge of each fiber. As for CPC,we have experimentally confirmed that the solar energy density from CPC increased 3.67 times as that of an optical fiber bundle output. This result coincides with the theoretical one. If the optical fiber bundle works as well as that of theoretical one and the direct solar insolation is 800W/m^2,900W/cm^2 of concentrated solar power density at the output of CPC can be obtained. This value is sufficient to provide energy to latent heat thermal storage system, in which LiF and LiF/CaF_2 are used as phase change materials.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] H.Naito et al.: "Development of a Solar Receiver for a High-Efficiency Thermionic/Thermoelectric Conversion System" Solar Energy. 58. 191-195 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Arashi et al.: "Highly Concentrated Solar Energy Transmission Through an Optical Fiber Coupled with CPC" Proc.of 32nd Intersociety Energy Conversion and Enginnering Conf.4. 1871-1876 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.S.Saito et al.: "Analysis of Close-Contact Melting With Inner Wall Temperature Variation in a Horizontal Cylindrical Capsule" Poc.of 32nd intersociety Energy Conversion and Enginnering Conf.4. 1641-1645 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.S.Saitoh et al.: "Theoretical Analysis and Experiment on Combined Close-Contact and Natural Convection Melting in Thermal Tnergy Storage Spherical Capsule" Poc.of 32nd intersociety Energy Conversion and Enginnering Conf.4. 1656-1661 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Naito et al.: "Uniform Heating of an Emitter for a Thermionic Converter Using Concentrated Solar Radiation" Proc.of ISES 1997 Solar Energy Congress. 2. 253-259 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Arashi et al.: "Development of a Solar Heat Receiver and Its Application to High-Temperature Vapor Electrolysis" Thermochimica Acta. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Naito, Y.Kohsaka, D.Cooke and H.Arashi: "Development of a Solar Receiver for a High-Efficiency Thermionic/Thermoelectric Conversion System" Solar Energy. 58. 191-195 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Haruo Arashi, Hitoshi Naito, Hiroo Yugami, and Toshiharu Oka: "HIGHLY CONCENTRATED SOLAR ENERGY TRANSMISSION THROUGH AN OPTICAL FIBER COUPLED WITH CPC" Proc.of 32nd Intersociety Energy Conversion and Engineering Conference. 1871-1876 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takeo S.Saitoh, and Akira Hoshi: "ANALYSIS OF CLOSE-SONTACT MELTING WITH INNER WALL TEMPERATURE VARIATION IN A HORIZONTAL CYLINDRICAL CAPSULE" Proc.of 32nd Intersociety Energy Conversion and Engineering Conference. 1641-1645 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takeo S.Saitoh, Hidehiro Hoshina, and Kenichi Tamada: "Theoretical Analysis and Experiment on Combined Close-Contact and Natural Convection Melting in Thermal Energy Storage Spherical Capsule" Proc.of 32nd Intersociety Energy Conversion and Engineering Conference. 1656-1661 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Naito, T.Umeoka, H.Yugami and H.Arashi: "Uniform Heating of an Emitter for a Thermionic Converter Using Concentrated Solar Radiation" Proc.of ISES 1997 Solar Energy Congress. 2. 253-259 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Arashi, H.Naito, H.Yugami, and Y.Yamauchi: "Development of a Solar Heat Receiver and Its Application to High-Temperature Vapor Electrolysis" Thermochimica Acta.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Arashi et al.: "Highly Concentrated Solar Energy Transmission Through an Optical Fiber Coupled with CPC" Proc.of 32nd Intersociety Energy Conversion and Engineering Conf.4. 1871-1876 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Naito et al.: "Uniform Heating of an Emitter for a Thermionic Converter Using Concentrated Solar Radiation" Proc. of ISES 1997 Solar Energy Congress. 2. 253-259 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H. NAITO: "DEVELOPMENT OF A SOLAR RECEIVER FOR A HIGH-EFFICIENCY THERMIONIC/THERMOELECTRIC CONVERSION SYSTEM" Solar Energy. 58. 191-195 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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