한국지열·수열에너지학회논문집 (Journal of the Korean Society for Geothermal and Hydrothermal Energy)

  • 제21권4호
  • /
  • Pages.40-50
  • /
  • 2025
  • /
  • 2799-4783(pISSN)
  • /
  • 2799-4805(eISSN)
한국지열·수열에너지학회 (Korean Society for Geothermal and Hydrothermal Energy)
권호 표지
DOI QR코드

DOI QR Code

관형 디퓨저 홀 및 배플이 소형 축열조의 성층화 성능에 미치는 영향에 관한 수치적 연구

Numerical Study on the Effect of Tubular Diffuser Holes and Baffles on the Stratification Performance of a Small-Scale Thermal Storage Tank

  • 강현웅 (조선대학교 기계공학과) ;
  • 함정균 (조선대학교 기계공학과)
  • Hyeonung Kang (Department of Mechanical Engineering, Chosun University) ;
  • Jeonggyun Ham (Department of Mechanical Engineering, Chosun University)
  • 투고 : 2025.11.10
  • 심사 : 2025.11.27
  • 발행 : 2025.12.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This study numerically investigates the effects of diffuser hole diameter and baffle installation on thermal stratification and charging performance in a stratified storage tank. Without baffles, the diffuser hole diameter influenced stratification through the interaction of buoyancy and momentum. A Froude number (Fr) of 1-2 resulted in relatively uniform temperature distribution and moderate thermal quality, whereas smaller or larger diameters caused increased mixing or more pronounced upper-layer heat diffusion, reducing performance. The addition of baffles structured the flow and contributed to more stable stratification while reducing sensitivity to diffuser hole diameter. In the lower portion of the tank, baffles promoted lateral spreading of inflow and limited vertical mixing, bringing temperatures closer to the 7℃ target. The final charging ratio ranged from 88.5% to 89.2%, showing a 3.3-5.6% increase compared with the no-baffle case. These results suggest that diffuser and baffle design can influence stratification and charging behavior in stratified thermal storage tanks.

키워드

과제정보

본 결과물은 농림축산식품부 및 과학기술정보통신부, 농촌진흥청의 재원으로 농림식품기술기획평가원과 재단법인 스마트팜연구개발사업단 (RS-2025-02219443)의 스마트팜다부처패키지혁신기술개발사업과 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다. (No. RS-2024-00441860).

참고문헌

  1. 김후배. "캡슐타입 빙축열시스템의 축열조 내부 분배배관 유동연구." 국내석사학위논문 서울과학기술대학교 산업대학원, 2014. 서울.
  2. Deng, Y., Sun, D., Niu, M., Yu, B., and Bian, R., 2021, Performance assessment of a novel diffuser for stratified thermal energy storage tanks–The nonequal-diameter radial diffuser. Journal of Energy Storage, 35, 102276. https://doi.org/10.1016/j.est.2021.102276
  3. Chung, J. D., Cho, S. H., Tae, C. S., and Yoo, H., 2008, The effect of diffuser configuration on thermal stratification in a rectangular storage tank. Renewable Energy, 33(10), 2236-2245. https://doi.org/10.1016/j.renene.2007.12.013
  4. 강한기, 2008, 원형 디퓨저의 유량 분배 변화에 따른 사각 축열조 성능 특성 (Doctoral dissertation, 한양대학교).
  5. Afshan, M. E., Selvakumar, A. S., Velraj, R., and Rajaraman, R., 2020, Effect of aspect ratio and dispersed PCM balls on the charging performance of a latent heat thermal storage unit for solar thermal applications. Renewable Energy, 148, 876-888. https://doi.org/10.1016/j.renene.2019.10.172
  6. Kim, N., and Lee, J. I. Effect of Aspect ratio on Performance of Packed Bed for Thermal Energy Storage.
  7. Jiang, L., & Yan, J., 2024, A new reactor with porous baffle for thermochemical heat storage: Design and performance analysis. Applied Thermal Engineering, 257, 124253. https://doi.org/10.1016/j.applthermaleng.2024.124253
  8. Gao, L., Lu, H., Sun, B., Che, D., and Dong, L., 2021, Numerical and experimental investigation on thermal stratification characteristics affected by the baffle plate in thermal storage tank. Journal of Energy Storage, 34, 102117. https://doi.org/10.1016/j.est.2020.102117
  9. Ji, Y. Y., Sohn, D. K., and Ko, H. S., 2025, Experimental study on influence of baffle material on charging and discharging process in latent heat thermal energy storage system. Applied Thermal Engineering, 128901.
  10. Abdellatif, H. E., Belaadi, A., Arshad, A., Bourchak, M., and Ghernaout, D., 2024, Enhanced solar energy utilization of thermal energy storage tanks with phase change material and baffle incorporating holes. Thermal Science and Engineering Progress, 52, 102674. https://doi.org/10.1016/j.tsep.2024.102674