• 제목/요약/키워드: 액침 냉각

검색결과 2건 처리시간 0.013초

국부적인 발열부분을 가진 표면에서의 잠김 비등열전달 -전자부품 액침 냉각에서의 응용- (Boiling Heat Transfer from a locally Heated Surface -A Simulated Electronic Device under Liquid Immersion Cooling-)

  • 하광순;최상민
    • 대한기계학회논문집
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    • 제15권2호
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    • pp.685-692
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    • 1991
  • The pool boiling behavior of a heated surface has been investigated experimentally, focusing on the cases when only a part of the contact surface is heated. Characteristic boiling curves are obtained with circular metal surface test pieces heated below while immersed in Refrigerant-113. Locally heated test pieces are fabricated by inserting a heating block at the center inside a larger conducting block. Overall heat transfer rates are measured while the experimental conditions are systematically varied. The local temperature profiles along the radius are measured for conducting blocks. It is found that the conjugated boiling condition exists and the total heat fluxes should be correlated to a suitably defined temperature difference.

ESS(Energy Storage System) 열관리를 위한 액침 냉각 활용에 대한 수치해석 연구 (Numerical Study on using Immersion Cooling for Thermal Management of ESS (Energy Storage System))

  • 함정균;유나영;신명재;조홍현
    • 한국지열·수열에너지학회논문집
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    • 제20권2호
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    • pp.1-10
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    • 2024
  • The introduction of the sector coupling concept has expanded the scope of ESS utilization, resulting in the importance of thermal management of ESS. To ensure the safe use of the lithium-ion batteries that are used in ESS, it is important to use the batteries at the optimal temperature. To examine the utilization of liquid cooling in ESS, numerical study was conducted on the thermal characteristics of 21700 battery modules (16S2P array) during liquid cooling using Novec-649 as insulating fluid. The NTGK model, an MSMD model in ANSYS fluent, was used to investigate thermal characteristics on the battery modules with liquid immersion cooling. The results show that the final temperature of the battery module discharged at 5 C-rate is 68.9℃ using natural convection and 48.3℃ using liquid cooling. However, the temperature difference among cells in the battery module was up to 0.5℃ when using natural convection cooling and 5.8℃ when using liquid cooling, respectively, indicating that the temperature difference among cells was significantly increased when liquid cooling was used. As the mass flow rate increased from 0.01 kg/s to 0.05 kg/s, the average temperature of the battery module decreased from 48.3℃ to 38.4℃, confirming that increasing the mass flow rate of the insulating fluid improves the performance of liquid immersion cooling. Although partial liquid immersion cooling has a high cooling performance compared to natural convection cooling, the temperature difference between modules was up to 8.9℃, indicating that the thermal stress of the battery cells increased.