• Title/Summary/Keyword: Shell-and-tube

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Experimental Study on Heat Transfer Performance of Oil Cooler (오일 쿨러의 열전달 성능에 관한 실험적 연구)

  • Cho, Dong-Hyun;Lim, Tae-Woo
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2328-2333
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    • 2008
  • The experimental study was carried out to evaluate the heat transfer performance on the shell side of shell-and-plate finned tube heat exchanger with three different tube numbers(9, 13 and 19). Oil flowing on the shell side was cooled by cold water flowing inside the tubes. A shell-and-tube heat exchanger of an oil cooler consisted of one shell pass and two tube passes with the inner tube diameter of 8.82 mm and the tube length of 575 mm. Mass flow rate was varied from 1.2 to $6.0\;m^3/h$ for oil and from 0.6 to $3.0\;m^3/h$ for cold water, respectively. From the experiment of shell-and-plate finned tube heat exchanger, the shell side heat transfer coefficient of heat exchanger with 9 tubes was compared with that of 13 and 19 tubes. It was found that the heat exchanger with 9 plate finned tubes showed more performance of heat transfer than that of 13 and 19 tubes.

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An Experimental Study of Shell and Tube Heat Exchanger Performance with Baffle Spacing (배플수에 따른 원통다관형 열교환기 성능에 관한 실험 적 연구)

  • Lee, Yuk-Hyeong;Kim, Sun-Yeong;Park, Myeong-Gwan
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.12
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    • pp.1748-1755
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    • 2001
  • The shell and tube heat exchangers were introduced to apply to a big capacity condenser and a high pressure feed water heater for power plant in the beginning of 1990s. Design and manufacturing technology fur shell and tube heat exchangers have been developed until now. But it is very difficult to calculate the expected performance characteristics of the shell and tube heat exchanger, because there are many design parameters to be considered according to internal structure and the shell side heat transfer mechanism complicately related to the design parameters. Design parameters to be considered in the design stage of shell and tube heat exchanger are shell and tube side fluids, flow rate, inlet and outlet temperature, physical properties, type of heat exchanger, outer diameter, thickness, length of tube, tube arrangement, tube pitch, permissive pressure loss on both sides, type of baffle plate, baffle cutting ratio. The propose of study is an analysis TEMA(Tubular Exchanger Manufacturers Association) E shell and tube heat exchanger performance with changing a number of baffles(3, 5, 7, 9, 11) and tubes(16, 20) and determined optimal baffle spacing.

A Study on Heat Transfer Enhancement of Oil Cooler (유냉각기의 열전달 촉진에 관한 연구)

  • Cho, D.H.;Lim, T.W.
    • Journal of Power System Engineering
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    • v.15 no.3
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    • pp.25-30
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    • 2011
  • A shell-and-tube oil cooler with plate fins was suggested to improve the defect of the conventional shell-and-tube oil cooler. Experiments were conducted to evaluate the heat transfer performance on the shell side of shell-and-plate finned tube oil cooler with three different tube numbers(9, 13 and 19). Oil flowing on the shell side was cooled by cold water flowing inside the tubes. A shell-and-tube heat exchanger of an oil cooler consisted of one shell pass and two tube passes with the inner tube diameter of 8.82 mm and the tube length of 575 mm. From the experiment of shell-and-tube oil cooler, it was found that the heat transfer coefficient of oil cooler with 9 tubes, as oil flow rate was increased, was approximately 140% and 250% higher than that of 13 and 19 tubes, respectively. The heat transfer coefficient at the water flow rate of $3m^3/h$, also was 120% and 140% higher than that of 2.4 and $1.8m^3/h$, respectively.

Investigation of Stresses Due to Various Parameters of Shell and Tube Oil Cooler (다관 원통식 오일 냉각기의 다양한 파라미터에 따른 스트레스 고찰)

  • Han, S.K.
    • Journal of Power System Engineering
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    • v.13 no.1
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    • pp.5-12
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    • 2009
  • The present work aims to estimate channel, shell, tube and tube sheet stresses of shell and tube oil cooler stemmed from various parameters. These parameters involve size, thickness and dimension of shell and tube oil cooler, including fluid temperature. The main purpose of the present work is to ensure safety of design products and also develop new products rapidly. For stress evaluation of oil coolers, first of all, the maximum pressure on the shell-side and on the tube side is fixed with 3.1MPa and 1.5MPa, respectively. Secondly, the pressure on each side varies from 2MPa to 3.1MPa on the shell side and tram 0.6MPa to 2MPa on the tube side. Various parameters under these conditions are employed to estimate design stresses on each side of oil cooler. These basic information related to stresses will be useful for a designer or manufacturer of an oil cooler.

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Analysis on Characteristics of Thermal Flow of Hot Air in Single Shell of Shell and Tube-type Heat Exchanger (쉘앤튜브형 열교환기의 단일 쉘 내 고온공기 열유동 특성 해석)

  • Young-Joon Yang
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.2_2
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    • pp.255-263
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    • 2023
  • The shell and tube-type heat exchangers have been frequently used in many industrial field because of its simple structure and wide operation conditions and so on. The purpose of this study is to investigate the flow characteristics in single shell of shell and tube-type heat exchanger according to velocity and temperature of hot air released from heat exchanger simulator through numerical analysis. As the results, the temperature was decreased in almost quadratic curve from top to bottom in single shell of the shell and tube-type heat exchanger. Further the changes of pressure and velocity in outlet according to change of inlet temperature were not observed. The cost for operating the shell and tube-type heat exchanger should be compared the supply cost of hot air with that of velocity in order to make a economic decision.

The Performance in Shell-and-Tube Heat Exchangers with Configuration and Surface Characteristics of Tube (Tube의 형상 및 표면특성에 의한 Shell-and-Tube 열교환기의 열전달 성능)

  • Kim, Sung-Il;Park, Ki-Ho;Chun, Won-Pyo
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2316-2321
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    • 2008
  • This paper presents an improved performance of heat transfer for shell-and-tube and thermal analysis based on the Bell-Delaware method for single tube. Heat transfer has been compared for a smooth tube, helical tube and surface-coated tube. In general, the results showed that properly designed helical tube and surface-coated tube offer a significant improvement in heat transfer. The numerical results derived from the Bell-Delaware method for the shell-side heat transfer coefficient were verified with experimental results. The thermal analysis aids significantly in the solution of the design problem.

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Study on Heat Transfer Coefficient Test of Evaporator Tube in Shell and Tube Heat Exchanger by Shape (관 형태에 따른 Shell and Tube 열교환기의 열전달계수 관한 연구)

  • Kwon, Jae-Jeong;Park, Jae-Hong;Kim, In-Kwan;Kim, Young-Soo
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.1107-1112
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    • 2006
  • The purpose of this study is a heat transfer coefficient test of evaporator tube in shell and tube heat exchanger by shapes, using R-404A. The experimental apparatus is designed to simulate the real heat transfer rate in one shell and tube heat exchanger. The test section is formed four type tubes that are Inner ridged tube, Corrugated tube, Turbo-C tube, Inner fin tube and shell type is formed by electrical heater. All tests were performed at a fixed refrigerant evaporator temperature at $1.5^{\circ}C,\;-3^{\circ}C$ and with mass fluxes of 29, 25 kg/hr. Heat transfer rate is calculated a enthalpy difference in test section. In experiment, heat transfer coefficient measured one by one and electrical heaters are supplemented by evaporator.

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Performance of a Shell-and-Tube Heat Exchanger with Spiral Baffle Plates

  • Son, Yeong-Seok;Sin, Ji-Yeong
    • Journal of Mechanical Science and Technology
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    • v.15 no.11
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    • pp.1555-1562
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    • 2001
  • In a conventional shell-and-tube heat exchanger, fluid contacts with tubes flowing up and down in a shell, therefore there is a defect in the heat transfer with tubes due to the stagnation portions . Fins are attached to the tubes in order to increase heat transfer efficiency, but there exists a limit. Therefore, it is necessary to improve heat exchanger performance by changing the fluid flow in the shell. In this study, a highly efficient shell-and-tube heat exchanger with spiral baffle plates is simulated three-dimensionally using a commercial thermal-fluid analysis code, CFX4.2. In this type of heat exchanger, fluid contacts with tubes flowing rotationally in the shell. It could improve heat exchanger performance considerably because stagnation portions in the shell could be removed. It is proved that the shell-and-tube heat exchanger with spiral baffle plates is superior to the conventional heat exchanger in terms of heat transfer.

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Study upon Design Stress due to Pressure of Shell-and-Tube Type Heat Exchanger (원통다관식 열교환기의 압력 변화에 따른 설계 응력 연구)

  • Lee, Y.B.;Han, S.G.;Ko, J.M.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.5 no.2
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    • pp.8-13
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    • 2008
  • Shell-and-tube type heat exchangers are generally classified with fixed tube-sheet and floating tube-sheet heat exchangers. In this paper, we employed the fixed tube-sheet heat exchangers. We theoretically investigated the safety evaluation of our shell-tube heat exchanger by axial, bending and equivalent stress of fin tubes, tube plates, channels and shell. Design pressure ranges were chosen pressure($0.6{\sim}2\;MPa$) on tube side and 200 %(3 MPa) of Maximum pressure on shell side for safety evaluation of heat exchangers. This research will be useful for fabrication of heat exchangers to prevent against damage hazard of heat exchangers in operation.

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Study on Heat Transfer Characteristic of Shell-and-Tube Heat Exchanger with Plate Fin (판형 핀을 가진 원통-다관형 열교환기의 열전달 특성에 관한 연구)

  • Lim, Tae-Woo;Cho, Dong-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.1
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    • pp.46-51
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    • 2009
  • In this work, the experimental investigation was carried out to evaluate the heat transfer performance on the shell side of shell-and-plate finned tube heat exchanger with three different tube numbers(9, 13 and 19). Oil flowing on the shell side was cooled by cold water flowing inside the tubes. A shell-and-tube heat exchanger of an oil cooler consisted of one shell pass and two tube passes with the inner tube diameter of 8.82 mm and the tube length of 575 mm. Mass flow rate was varied from 1.2 to $6.0\;m^3/h$ for oil and from 0.6 to $3.0\;m^3/h$ for cold water, respectively. From the experiment of shell-and-plate finned tube heat exchanger, the overall heat transfer coefficient of heat exchanger with 9 tubes was compared with that of 13 and 19 tubes. It was found that the heat transfer coefficients in shell side of heat exchanger with 9 plate finned tubes showed averagely 1.8 times and 2.3 times higher than those of 13 and 19 tubes, respectively.