Evaluation of conduction cooling effect of cryocooler-cooled HTS coils for SMES application

Takuya Kotoyori, Hideaki Ohnishi, Yuta Masui, Atsushi Ishiyama, Watanabe Tomonori, Naoki Hirano, Shigeo Nagaya, K. Shikimachi

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    In recent years, the quality of high-temperature superconductors (HTS) has been improving. Our goal is to apply an HTS coil to superconducting magnetic energy storage, because an HTS coil is more thermally stable than a low-temperature superconductor coil owing to high thermal margin during its transition to the normal state and its high thermal capacity at a high operational temperature. On the other hand, to enhance the reliability and safety of an HTS coil, it is necessary to establish a stability criterion to prevent thermal and mechanical damages during a quench. Therefore, we have to clarify the thermal behavior of a cryocooler-cooled HTS coil assuming practical applications. In this study, we evaluated the cooling effect using a numerical simulation and thermal conduction experiments. The numerical simulation was based on the finite element analysis, and the thermal conduction experiments were carried out on a model coil wound with electrically insulated copper and stainless steel laminated tapes. These had the same shape and dimensions as YBCO tape, assuming an application to an superconducting magnetic energy storage coil. We focused especially on the cooling effect of a winding with paraffin impregnation compared with that of a dry winding.

    Original languageEnglish
    Article number6461068
    JournalIEEE Transactions on Applied Superconductivity
    Volume23
    Issue number3
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    High temperature superconductors
    high temperature superconductors
    coils
    Cooling
    cooling
    conduction
    evaluation
    magnetic energy storage
    Tapes
    Energy storage
    tapes
    Stainless Steel
    Computer simulation
    Stability criteria
    Impregnation
    Paraffin
    Paraffins
    Superconducting materials
    Specific heat
    Copper

    Keywords

    • Paraffin impregnation
    • superconducting magnetic energy storage (SMES)
    • thermal behavior
    • YBCO coils

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Evaluation of conduction cooling effect of cryocooler-cooled HTS coils for SMES application. / Kotoyori, Takuya; Ohnishi, Hideaki; Masui, Yuta; Ishiyama, Atsushi; Tomonori, Watanabe; Hirano, Naoki; Nagaya, Shigeo; Shikimachi, K.

    In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 6461068, 2013.

    Research output: Contribution to journalArticle

    Kotoyori, Takuya ; Ohnishi, Hideaki ; Masui, Yuta ; Ishiyama, Atsushi ; Tomonori, Watanabe ; Hirano, Naoki ; Nagaya, Shigeo ; Shikimachi, K. / Evaluation of conduction cooling effect of cryocooler-cooled HTS coils for SMES application. In: IEEE Transactions on Applied Superconductivity. 2013 ; Vol. 23, No. 3.
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