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Energy Efficiency Evaluation for VRF System with Unbalanced Load Operation

Research Project

Project/Area Number 17K18351
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Architectural environment/Equipment
Thermal engineering
Research InstitutionNational Institute for Land and Infrastructure Management

Principal Investigator

Masato Miyata  国土技術政策総合研究所, 住宅研究部, 主任研究官 (40554986)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords非住宅建築物 / 省エネルギー / パッケージエアコン / VRF / JIS / 運転効率 / シミュレーション / 負荷偏在 / 建築物 / 省CO2 / 空調 / マルチ型エアコン / ヒートポンプ / 冷媒 / 建築環境・設備 / 空調設備 / 性能向上
Outline of Final Research Achievements

The number of buildings that adopt the multiple split-system air conditioners is increasing, but there are still many unclear points about its actual performance, in particularly, with regard to performance under partial load condition. In order to clarify the system efficiency under partial load condition, this research measured fundamental data on the energy efficiency of the multiple split-system in an experimental facility that connects multiple constant temperature and humidity chambers and clarified the influence of the unbalance heat load to the system energy efficiency and developed an estimation method of the operation efficiency.

Academic Significance and Societal Importance of the Research Achievements

建築物のエネルギー消費量の削減は、エネルギー資源に乏しい我が国にとって喫緊の課題である。本研究の成果より、中小規模の非住宅建築物を中心に採用が増えているマルチ形エアコンについて、従来は不明であったエネルギー消費特性の実態が判明し、どのように設計・運用すれば高効率運転を維持できるかが明らかになった。空調設備は建築物のエネルギー消費の大半を占めるため、本研究の成果は今後の民生部門のエネルギー消費量削減に大きく貢献する。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (13 results)

All 2020 2019 2018 2017

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] The first world championship in cybernetic building optimization2020

    • Author(s)
      Togashi Eisuke、Miyata Masato、Yamamoto Yoshihide
    • Journal Title

      Journal of Building Performance Simulation

      Volume: 13 Issue: 3 Pages: 391-408

    • DOI

      10.1080/19401493.2020.1741685

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Energy efficiency evaluation of multiple split-system air conditioners with unbalanced load operation for building energy simulation2019

    • Author(s)
      Masato Miyata
    • Journal Title

      Earth and Environmental Science

      Volume: 238

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Validation of Unsteady CFD considering Thermal Load Fluctuation in Office Room2019

    • Author(s)
      Ken Fukada, Masato Miyata
    • Journal Title

      Earth and Environmental Science

      Volume: 238

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of building thermal environment emulator to evaluate the performance of the HVAC system operation2019

    • Author(s)
      Eisuke Togashi, Masato Miyata
    • Journal Title

      Journal of Building Performance Simulation

      Volume: Vol.12 Issue 5 Issue: 5 Pages: 663-684

    • DOI

      10.1080/19401493.2019.1601259

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Energy efficiency evaluation of multiple split-system air conditioners with unbalanced load operation for building energy simulation2019

    • Author(s)
      Miyata M
    • Journal Title

      IOP Conference Series: Earth and Environmental Science

      Volume: 238 Pages: 012082-012082

    • DOI

      10.1088/1755-1315/238/1/012082

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Validation of Unsteady CFD considering Thermal Load Fluctuation in Office Room2019

    • Author(s)
      Fukada K、Miyata M
    • Journal Title

      IOP Conference Series: Earth and Environmental Science

      Volume: 238 Pages: 012033-012033

    • DOI

      10.1088/1755-1315/238/1/012033

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Performance evaluation of the variable refrigerant flow (VRF) air-conditioning system during the heating-defrosting cyclic operation2017

    • Author(s)
      Napoleon ENTERIA, Hideki YAMAGUCHI, Masato MIYATA, Takao SAWACHI, Yasuo KUWASAWA
    • Journal Title

      Journal of Thermal Science and Technology

      Volume: 12 Issue: 2 Pages: JTST0035-JTST0035

    • DOI

      10.1299/jtst.2017jtst0035

    • NAID

      130006223763

    • ISSN
      1880-5566
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Development of Energy Efficiency Estimation Method for Variable Refrigerant Flow Air-Conditioning System with Unbalanced Heat Load Operation2019

    • Author(s)
      Masato Miyata
    • Organizer
      Building Simulation 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 処理熱量の偏在がマルチ型パッケージエアコンの運転効率に与える影響の解明2019

    • Author(s)
      宮田征門
    • Organizer
      空気調和・衛生工学会大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ZEB時代の建築空調負荷とこれに対応した空調技術の必要性2019

    • Author(s)
      宮田征門
    • Organizer
      第53回空気調和・冷凍連合講演会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 処理熱量の偏在がマルチ型パッケージエアコンの運転効率に与える影響の解明2018

    • Author(s)
      宮田征門
    • Organizer
      空気調和・衛生工学会大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Energy efficiency evaluation of multiple split-system air conditioners with unbalanced load operation for building energy simulation2018

    • Author(s)
      Masato Miyata
    • Organizer
      The 4th Asia Conference of International Building Performance Simulation Association
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Validation of Unsteady CFD considering Thermal Load Fluctuation in Office Room2018

    • Author(s)
      Ken Fukada
    • Organizer
      The 4th Asia Conference of International Building Performance Simulation Association
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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