Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Evaporating heat transfer characteristics of Aluminum-brass tube for seawater cooling system using R-134a

해수냉각시스템용 Aluminium Brass Tube의 R-134a 증발열전달 특성

  • Kang, In-Ho (Graduate School, Pukyong National University) ;
  • Seol, Sung-Hoon (Graduate School, Pukyong National University) ;
  • Yoon, Jung-In (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University) ;
  • Son, Chang-Hyo (Pukyong National University)
  • Received : 2017.01.17
  • Accepted : 2017.03.05
  • Published : 2017.03.31
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Abstract

Most fishing vessels use an ice cooling system to manage and store captured fish. However, it is difficult to maintain an adequate temperature and salt concentration as well as operating time limitations in ice cooling systems. The purpose of this study is to investigate the heat transfer characteristics of flooded-type evaporators for a seawater cooling system to maintain proper seawater temperature in a fish tank. Experiments were conducted to investigate the heat transfer characteristics by changing the seawater temperature, flow rate, and saturation temperature of the refrigerant. It was confirmed that the heat transfer coefficient of an aluminum-brass tube was approximately 10% higher than that of a copper-nickel tube at the same heat flux. Furthermore, it was confirmed that applying the aluminum-brass tube to the heat transfer tube of a seawater heat exchanger was effective in terms of heat transfer. A comparison of the overall heat transfer coefficient of a single-tube heat exchanger and the flooded-type multi-tube heat exchanger for an 18-kW cooling system showed that the heat transfer coefficient of the single-tube heat exchanger was 25% higher under the same conditions. These results are considered to be important data for designing a flooded-type multi-tube heat exchanger.

대부분의 어선에서는 포획된 어류를 관리하고 저장하기 위해 얼음 냉각 시스템을 사용한다. 그러나 얼음 냉각 시스템은 작동 시간의 제한뿐만 아니라 적절한 온도와 염분 농도를 유지하는 것이 어려운 단점이 있다. 본 연구의 목적은 어류 운반선의 어창에 적정한 해수온도 유지를 위한 해수 냉각 시스템용 만액식 증발 열전달 특성을 파악하는데 있다. 실험은 냉매의 해수 온도, 유량 및 포화 온도의 변화를 주며 열전달 특성을 파악하였다. 동일 열유속에서 Aluminium-Brass tube가 Copper-Nickel tube 보다 외측 열전달계수가 약 10% 큰 것으로 확인할 수 있었으며, 이를 통해 해수용 열교환기의 전열관으로 Aluminium-Brass를 적용하는 것이 열전달 측면에서 효과적일 것을 확인할 수 있었다. 만액식 단관 열전달계수와 18 kW급 만액식 해수냉각시스템의 총괄열전달계수의 비교를 통해 동일 조건에서는 25%정도 단관의 열전달계수가 큰 값을 나타내었으며, 이러한 결과는 만액식 관군 열교환기의 설계를 위한 중요한 자료가 되리라 판단된다.

Keywords

References

  1. I. G. Han, C. G. Moon, J. D. Kim, and J. I. Yoon, "Heat load characteristics of sea water cooling appratus on inshore fishing boat," Journal of the Korean Society of Marine Engineering, vol. 25, no. 6, pp. 1317-1323, 2001 (in Korean).
  2. J. I. Yoon, K. H. Choe, C. H, Son, I. H. Kang, C. L. Kim, and S. H. Seol, "Performance comparison of flooded seawater cooling system with respect to heat sink temperature," Journal of the Korean Society for Power System Engineering, vol. 20, no. 2, pp. 91-96, 2016 (in Korean). https://doi.org/10.9726/kspse.2016.20.2.091
  3. C. H. Son, I. H. Kang, J. N. Lee, C. L. Kim, and J. I. Yoon, "Characteristics of refrigeration system for fishing-ships applying flooded evaporator," Proceedings of 2016 International Conference on Engineering, Technology, and Applied Science Spring Meeting, Taipei, Taiwan, 2016.
  4. C. H. Son, J. I. Yoon, S. H. Jung, C. L. Kim, S. H. Seol, and I. H. Kang, "Experimental study on seawater cooling system of effects on heat source temperature," Proceeding of the 40th the Korean Society of Marine Engineering Spring Conference, p. 83, 2016 (in Korean).
  5. P. A. Perigreen, S. A. Pillal, P. K. Surendran, and T. K. Govindan, "Studies on preservation of fish in refrigerated sea-water," Central Institute od Fisherise Technology, vol. 12, no. 2, pp. 105-111, 1975.
  6. E. Kolbe, "Refrigeration energy prediction for flooded tanks on fishing vessels," American Society of Agricultural Engineers, vol. 6, no. 5, pp. 624-628, 1990.
  7. J. K. Lim, H. M. Jeong, J. D. Kim, and J. I. Yoon, "Fluid and thermal characteristics of fish hold storage for sea water cooling system," Proceedings of 1991 The Korean Society of Mechanical Engineers Meeting, pp. 885-890, 1991 (in Korean).
  8. I. H. Cha, Experimental Correlation of Heat Transfer for Enhanced Surface Tubes uesd in Flooded Evaporating using Wilson Polt Method, M.S. Thesis, Department of Mechanical Engineering, Kyunghee University, Korea, 2005 (in Korean).
  9. D. S. Jung, "Pool boiling heat transfer coefficients of new refrigerants on various enhanced tubes," Korean Journal Of Air-Conditioning and Refrigeration Engineering, vol. 13, no. 8, pp. 710-720, 2001 (in Korean).
  10. S. G. Kim, An Experimental Study of Heat Transfer Performance by Oil Concentration in a Flooded Evaporator, M.S. Thesis, Department of Mechanical Engineering, Pusan University, Korea, 2011 (in Korean).
  11. M. G. Cooper, "Heat flow rate in saturated nucleate pool boiling-a wide-ranging examination using reduced properties," Advances in Heat Transfer, vol. 16, pp. 157-239, 1984.

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