• 제목/요약/키워드: 원통다관형

검색결과 28건 처리시간 0.023초

원통-다관형 열교환기의 다관측 입출구 유동 특성의 실험적 연구 (Experimental Study of Inlet/Outlet Flow Characteristics in Tube-side of Shell and Tube Heat Exchanger)

  • 도흔승;왕개;박승하;김형범
    • 대한기계학회논문집B
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    • 제38권7호
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    • pp.581-588
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    • 2014
  • 본 논문에서는 원통-다관형 열교환기의 다관측 유량의 분배도 향상을 위해 다공성 배플 유무에 따른 입구 및 출구부의 유동 특성을 실험적으로 연구하였다. 원통 및 다관측 유량의 분배성능은 원통-다관형 열교환기의 성능에 직간접적인 영향을 준다. 실험 연구를 위하여 원형 크기의 1/3로 축소한 실험 모델을 제작하였고, 60, 80, 90 LPM의 유량 조건에서 다공성 배플의 유무에 따른 다관측의 분배 성능을 입자화상속도기법을 이용한 입구 및 출구부의 속도장 측정을 통해 확인하였다. 연구로부터 절대 불균일 분배도를 계산하여 정량적으로 다공성 배플이 유량의 분배도에 주는 영향을 확인하였다. 측정 결과로부터 유량에 상관없이 배플을 설치하였을 경우 74%의 절대 불균일 분배도의 감소 효과를 가졌다.

원통다관형 열교환기의 가로막 개수에 관한 연구 (A study of number of baffle on shell and tube heat exchanger)

  • 김순영;이육형;박명관
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.635-638
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    • 2000
  • The propose of study analyze a TEMA(Tubular Exchanger Manufacturers Association) E shell and tube heat exchanger performance with 3, 5, 7, 9, 11 baffles and 16, 20 tubes. In this investigate measured a variation of the heat exchanger cooling capacity change within each number of baffle and tube number and determined optimal number of baffle. designs for industry applications are optimized using the analysis of test results.

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원통다관형 열교환기에서 배플인자가 열전달에 미치는 영향 (Effect of baffle parameters on heat transfer in shell-and-tube heat exchangers)

  • 이상천;조영우;남상철
    • 대한기계학회논문집B
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    • 제21권1호
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    • pp.185-194
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    • 1997
  • An experimental study has been performed on the effect of baffle parameters on shell -side heat transfer in a conventional shell-and-tube heat exchanger. The baffle spacing distance and the number of baffle were varied to investigate the behavior of unequal baffle spacing correction factor which is appeared in the Bell Delaware method for prediction of the shell-side heat transfer coefficient. It was obvious that heat duties obtained from the experiment significantly deviated from those calculated by the conventional Bell-Delaware method. A new correlation of the unequal baffle spacing correction factor was developed. It was shown that the new correlation improves the accuracy of the Bell-Delaware method considerably. This result may induce the use of the Bell-Delaware method in developing a computer software for design of shell-and-tube heat exchangers.

유동해석에의한 단상용 원통다관형 열교환기 열설계 코드의 개발 (Development of a Single Phase Shell-and-Tube Type Heat Exchanger Thermal Design Code Based on Stream Analysis)

  • 반태곤;이상천;남상철;박병덕
    • 에너지공학
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    • 제10권4호
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    • pp.299-309
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    • 2001
  • 본 원통다관형 열교환기 설계 코드는 기존에 적용된 Bell-Delaware법 보다 한 차원 발전된 유동 해석법을 적용하여 좀더 정확하고 향상된 열교환기를 설계 하고자 한다. 열교환기 설계에 영향을 미치는 주요한 인자들에 대한 특성 및 설계 범위를 나타내었다. 유동 분율을 구하기 위한 유동 해석(Stream analysis)법에 대한 개략적인 소개와 열교환기 설계를 위한 순서도를 나타내었다. 설계 코드의 성능평가를 위하여 Delaware09, Delaware10, DongHwa, ANL에 대한 실험결과와 성능 비교를 수행하였다. 그 결과 열전달 및 압력 손실 예측치의 대부분이 $\pm$30% 이내에 만족함을 보였으나, 압력손실 부분에서는 전체적으로 과예측 결과를 나타내었다.

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중온형 원통다관형 수증기 개질기의 부분단열 및 반경방향 분배 구조의 영향 (Partial Insulation and Heating Tubes Configuration of Shell and Tube Steam Reformer at Medium Temperature)

  • 박다인;유상석
    • 한국수소및신에너지학회논문집
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    • 제28권6호
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    • pp.618-626
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    • 2017
  • Conventional high temperature reformers are not suitable for hybrid fuel cell systems that use waste heat as a heat source. So, development of a low temperature type reformer is needed. However, the analysis was conducted in two ways to increase the thermal efficiency, because of low reforming rate due to the low heat source. First, it is a way to ger thermal gain from the outside through partial insulation. In the case of one heat source tube and several heat source tubes, we analyzed the effect of partial heat insulation in some cases. Second, we found the most efficient arrangement of the heat source tubes by changing the location of the heat source tubes. The interpretation was carred out using the COMSOL Mutiphysics program.

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

  • 이육형;김순영;박명관
    • 대한기계학회논문집B
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    • 제25권12호
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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.

유동분배판에 의한 원통 다관형 열교환기의 성능 특성에 관한 수치해석적 연구(I): 유동특성 (NUMERICAL STUDY ON THE PERFORMANCE CHARACTERISTICS OF SHELL AND TUBE HEAT EXCHANGER BY FLOW DISTRIBUTORS : PART(I) FLOW CHARACTERISTICS)

  • 박영민;정희택;김형범
    • 한국전산유체공학회지
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    • 제19권3호
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    • pp.20-23
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    • 2014
  • The flow pattern inside the inlet chamber of the tube side is one of the key parameters influencing on the performances of the shell-and-tube type of heat exchangers(STHE). In order to improve the flow distribution, the baffle shaped as the porous plate is installed in the inlet chambers. In the present study, numerical simulation has been performed to investigate the flow features of the tube side of the STHE in sense of the hydraulic performances. The flow fields have been analysed by the three-dimensional Navier-Stokes solvers with the proper turbulent models. Computational domain is ranged in the whole of the tube side of the STHE. The numerical results showed that the presence of the baffles improves the redistribution of the flow injecting to the tube bundels. The good agreements of the numerical results with the experimental results of PIV measurements have been shown for the validation of the numerical methods adopted in the present papers.

유동분배판에 의한 원통-다관형 열교환기의 성능 특성에 관한 수치해석적 연구(II): 전열특성 (NUMERICAL STUDY ON THE PERFORMANCE CHARACTERISTICS OF SHELL AND TUBE HEAT EXCHANGER BY FLOW DISTRIBUTORS : PART(II) HEAT TRANSFER CHARACTERISTICS)

  • 박영민;이태호;정희택;김형범
    • 한국전산유체공학회지
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    • 제21권4호
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    • pp.28-32
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    • 2016
  • In the previous study, it is proved by numerical simulation that the baffle shaped as the porous plate installed in the inlet chambers improves the redistribution of the flow injecting to the tube bundles. In the present study, numerical simulation has been performed to investigate the effects of the flow distributors on the thermal characteristics of the shell and tube heat exchangers. The flow fields have been analysed by the three-dimensional Navier-Stokes solvers including the thermal conditions on the shell sides. The numerical results showed that the presence of the baffles improves the redistribution of the heat transfer to the tube bundles though the overall performance drop slightly on the present flow conditions.