Numerical analysis of pressure drop and temperature in a hairpin heat exchanger with different shell and tube bank arrangements
2
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
In this numerical study, the hairpin type shell and tube heat exchanger is analyzed for heating the cryogenic liquefied natu-ral gas (LNG). The cryogenic LNG is passed through the tube side and is heated by the hot water on the shell side of the hairpin heat exchanger. In order to increase the performance of the heat exchanger, maximum heat needs to be extracted from the hot water and transferred to the LNG stream. Thus, different arrangement of shell and tube sides of the hairpin heat exchanger are used to study the pressure drop in the hot water and to increase the temperature of the LNG. The effects of horizontal and vertical baffles orientation, staggered and aligned tube bank arrangements, baffles number (6, 8, 10 and 12), and baffles cut percentages were used to analyze the pressure drop and temperature difference in the exchanger. The results show that the pressure drop is decreased and the tube outlet temperature is increased in the heat exchanger for the percentage of baffle cut changes from 22.5% to 37.5%. Also, increasing the number of baffles increases both the temperature and pressure drop in the hairpin heat exchanger. Furthermore, comparing horizontal and vertical baffle orientation, pressure drop is always lower and LNG outlet temperature is always higher in the horizontal baffle orientation for both tube bank arrangement systems. However, in the horizontal baffle orientation the pressure drop for staggered tube bank arrangement is smaller than that of aligned tube bank arrangement, but the temperature of aligned tube bank is higher compared to the staggered tube bank arrangement.
Abstract
In this numerical study, the hairpin type shell and tube heat exchanger is analyzed for heating the cryogenic liquefied natu-ral gas (LNG). The cryogenic LNG is passed through the tube side and is heated by the hot water on the shell side of the hairpin heat exchanger. In order to increase the performance of the heat exchanger, maximum heat needs to be extracted from the hot water and transferred to the LNG stream. Thus, different arrangement of shell and tube sides of the hairpin heat exchanger are used to study the pressure drop in the hot water and to increase the temperature of the LNG. The effects of horizontal and vertical baffles orientation, staggered and aligned tube bank arrangements, baffles number (6, 8, 10 and 12), and baffles cut percentages were used to analyze the pressure drop and temperature difference in the exchanger. The results show that the pressure drop is decreased and the tube outlet temperature is increased in the heat exchanger for the percentage of baffle cut changes from 22.5% to 37.5%. Also, increasing the number of baffles increases both the temperature and pressure drop in the hairpin heat exchanger. Furthermore, comparing horizontal and vertical baffle orientation, pressure drop is always lower and LNG outlet temperature is always higher in the horizontal baffle orientation for both tube bank arrangement systems. However, in the horizontal baffle orientation the pressure drop for staggered tube bank arrangement is smaller than that of aligned tube bank arrangement, but the temperature of aligned tube bank is higher compared to the staggered tube bank arrangement.
참고문헌 (15)
- C. Dispenza, "Exergy recovery during LNG regasification : Electric en-ergy production-part one & two", Applied Thermal Engi-neering, 29(2-3), pp.380~399 (2009)
- M. Mehrpooya, "Optimum design and exergy analysis of a novel cryogenic air separation process with LNG(liquefied natural gas)cold energy utilization", Energy, 90(part 2), pp.2047~2069 (2015)
- V. L. Rocca, "Cold recovery during regasification of LNG part one : Cold utilization far from the regasification facili-ty", Energy, 35(5), pp.2049~2058 (2010)
- W. Cao, "Theoretical ap-proach of freeze seawater desalination on flake ice maker utilizing LNG cold energy", Desalination, 355, pp.22~32 (2015)
- R. K. Shah, "Fundamentals of Heat Ex-changer Design" (2003), John Wiley & Sons, Inc
- S. Fettaka, "Design of shell-and-tube heat exchangers using multiobjective optimization", International Journal of Heat and Mass Transfer, 60, pp.343~354 (2013)
- G. Kumaresan, "Numerical analysis of baffle cut on shell side heat exchanger performance with inclined baf-fles", Heat Transfer Engineering, 39(13-14), pp.1156~1165 (2018)
- E. Ozden, "Shell side CFD analysis of a small shell-and-tube heat exchanger", Energy Conservation and Management, 51(5), pp.1004~1014 (2010)
- B. A. Abdelkader, "The effect of a num-ber of baffles on the performance of shell-and-tube heat exchanger", Heat Transfer Engineering, 40(1-2), pp.39~52 (2019)
- H. Ay, "Local heat transfer measurements of plate finned-tube heat exchangers by in-frared thermography", International Journal of Heat and Mass Transfer, 45(20), pp.4069~4078 (2002)
- A. S. Yadav, "Effect of half length twisted-tape turbulators on heat transfer and pressure drop characteristic inside a double pipe U-bend heat exchanger", Jordan Journal of Mechanical and Industrial Engineering, 3(1), pp.17~22 (2009)
- K. Mohammadi, "Numerical investigation of the effect of baffle orientation on heat transfer and pressure drop in a shell and tube heat exchanger with leakage flows", Heat Transfer Engineering, 30(14), pp.1123~1135 (2010)
- Mohan Kumar Dey, "Numerical analysis of the effect of baffle orientation and baffle size on shell-side pressure drop in a liquefied natural gas (LNG) vaporizer", 한국마린엔지니어링학회지, 42(5), pp.364~370 (2018), 한국마린엔지니어링학회[DOI]
- I. Lu, "Applying the effectiveness-NTU method to elemental heat exchanger models", American Society of Heating, Refrigerating and Air-Conditioning Engineers, 113(1), pp.504~513 (2007)
- D. Q. Kern, "Process Heat Transfer" (1950), McGraw-Hill College