대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제40권9호
  • /
  • Pages.605-612
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  • 2016
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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다양한 아이스 볼 형상에 대한 복합열전달의 수치해석

Numerical Analysis of Conjugate Heat Transfer for Various Ice-Ball Shapes

  • 박서원 (서울과학기술대학교 일반대학원 기계공학과) ;
  • 김명수 (서울과학기술대학교 에너지환경대학원 에너지시스템공학과) ;
  • 전병진 (연세대학교 의과대학 삼장융합영상연구센터) ;
  • 최형권 (서울과학기술대학교 기계자동차공학과)
  • Park, Seo Won (Dept. of Mechanical Engineering, Graduate School, Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Myoung Soo (Dept. of Energy System, Graduate School of Energy and Environment, Seoul Nat'l Univ. of Science and Technology) ;
  • Jeon, Byoung Jin (Integrative Cardiovascular Imaging Research Center, Yonsei Cardiovascular Center, College of Medicine, Yonsei Univ.) ;
  • Choi, Hyoung Gwon (Dept. of Mechanical and Automotive Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 투고 : 2016.04.20
  • 심사 : 2016.06.13
  • 발행 : 2016.09.01
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초록

본 연구에서는 캡슐형 빙축열시스템에 적용되는 다양한 형상들을 가지는 아이스 볼에 대한 복합열전달 해석들을 수행하였다. 형상은 구 형상과 열전달 표면적을 넓힐 수 있도록 설계한 3가지 다른 형상을 포함하여 총 4가지 형상을 고려하였다. 볼 주위의 유동은 레이놀즈 수 300의 층류 유동으로, 볼 외부와 내부의 강제대류 및 자연대류를 고려하여 시뮬레이션을 수행하였다. 상용해석 코드인 ANSYS- FLUENT를 사용하여 비정상 열유동 해석을 수행하였다. 볼의 형상이 열전달에 미치는 영향을 고찰하여, Bone, Dimple, Hole, Sphere 형태 순으로 열전달 효율이 좋음을 확인하였다. 전체해석 기간 동안에 캡슐 내부 유체의 평균온도 차이는 최대 $0.9^{\circ}C$정도였다. 대용량 시스템의 경우 축열조 내에 30만개 이상의 캡슐이 들어가므로 캡슐 형상이 시스템 효율에 미치는 영향이 중요함을 확인하였다.

In this study, numerical simulations were conducted for conjugate heat transfer around ice balls in an encapsulated ice thermal storage system. Four shapes of ice balls were modeled; the default one was a sphere, and the other three shapes were designed to enhance convective heat transfer through the ball surface. The flow around the ball was laminar, for which the Reynolds number was 300, and both forced and natural convections inside and outside the balls were considered. The simulations revealed that the magnitude of convective heat transfer for the different shapes decreased in the following order: bone, dimple, hole, and sphere. For the entire simulation, the maximum difference in the average temperatures of water inside the capsules was found to be $0.9^{\circ}C$. Therefore, it can be said that the effect of ice-ball shape on the performance of the ice thermal storage system is significant, considering that more than 0.3 million balls are used in this system.

키워드

참고문헌

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