[논문]Heat transfer performance of a helical heat exchanger depending on coil distance and flow guide for supercritical cryo-compressed hydrogen

Cha, Hojun; Choi, Youngjun; Kim, Seokho

doi:10.9714/psac.2022.24.3.062

[국내논문] Heat transfer performance of a helical heat exchanger depending on coil distance and flow guide for supercritical cryo-compressed hydrogen 원문보기

Progress in superconductivity and cryogenics : PSAC, v.24 no.3, 2022년, pp.62 - 67

Cha, Hojun (Department of Smart Manufacturing Engineering, Changwon National University) , Choi, Youngjun (Department of Smart Manufacturing Engineering, Changwon National University) , Kim, Seokho (Mechanical engineering, Changwon National University)

Abstract ▼ AI-Helper

Liquid hydrogen (LH2) has a higher density than gaseous hydrogen, so it has high transport efficiency and can be stored at relatively low pressure. In order to use efficient bulk hydrogen in the industry, research for the LH2 supply system is needed. In the high-pressure hydrogen station based on LH2 currently being developed in Korea, a heat exchanger is used to heat up supercritical hydrogen at 700 bar and 60 K, which is pressurized by a cryogenic high-pressure pump, to gas hydrogen at 700 bar and 300 K. Accordingly, the heat exchanger used in the hydrogen station should consider the design of high-pressure tubes, miniaturization, and freezing prevention. A helical heat exchanger generates secondary flow due to the curvature characteristics of a curved tube and can be miniaturized compared to a straight one on the same heat transfer length. This paper evaluates the heat transfer performance through parametric study on the distance between coils, guide effect, and anti-icing design of helical heat exchanger. The helical heat exchanger has better heat transfer performance than the straight tube exchanger due to the influence of the secondary flow. When the distance between the coils is uniform, the heat transfer is enhanced. The guide between coils increases the heat transfer performance by increasing the heat transfer length of the shell side fluid. The freezing is observed around the inlet of distribution tube wall, and to solve this problem, an anti-icing structure and a modified operating condition are suggested.

주제어

표/그림 (17)

그림 Fig. 1. Hydrogen station supply system schematic diagram [6].
그림 Fig. 2. Straight counter flow heat exchanger.
그림 Fig. 3. Secondary flow effect (a) Dean vortics (b) Nusselt number ratio comparison according to D_e [12].
그림 Fig. 4. Helical heat exchanger geometry shape and dimensions (a) 3D view & flow vector (b) Front view(c) Coil inside cross section
그림 Fig. 5. Velocity contour of coil cross section (a) Straight tube (b) Helical tube.
표 TABLE 1 HEAT EXCHANGER DIMENTIONS.
표 TABLE 2 ANALYSIS BOUNDARY CONDITIONS
표 TABLE 3 HEAT EXCHANGER PERFORMANCE COMPARISON BETWEEN STRAIGHT AND HELICAL TYPE
그림 Fig. 6. Shell side streamline (a) With Guide between coils (b) Without guide between coils.
그림 Fig. 7. Heat transfer performance depending on distance between coils.
그림 Fig. 8. Shell side flow cross section (a) C*=0 mm (b) C*=18mm.
그림 Fig. 9. Coil outer wall temperature contour.
표 TABLE 4 HEAT EXCHANGER PERFORMABCE COMPARISON
그림 Fig. 10. Anti-icing structure.
그림 Fig. 11. Shell side velocity contour (a) Without anti-icing structure (b) With anti-icing structure.
그림 Fig. 12. Freezing temperature according to weight percent ethylene glycol [14].
그림 Fig. 13. Anti-freezing design result.

참고문헌 (14)

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상세보기
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