• 제목/요약/키워드: Carrier Pipe

검색결과 30건 처리시간 0.029초

정유운반선 파형격벽에 대한 경량화 프로그램 개발 (Development of the Weight Reduction Program for Corrugated Bulkheads of a Product Oil Carrier)

  • 신상훈;고대은
    • 대한조선학회논문집
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    • 제46권3호
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    • pp.279-289
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    • 2009
  • For a Product Oil Carrier, longitudinal bulkhead as well as transverse one is corrugated shape in general and intersection part of bulkheads is utilized for a pipe trunk. Since lower and upper stools are to be connected with all of longitudinal and transverse bulkheads, they have a uniform height respectively. The purpose of this study is the development of design system for the minimization of total weight of longitudinal and transverse bulkheads at the initial design stage. In this study, the beam element models for longitudinal and transverse corrugated bulkheads are established and they are applied to the structural analysis. For the practical design, the selection and the position of an additional pipe trunk are considered in this study. In addition the required minimum distance between the bracket installed along the web of corrugation at lower stool and the diaphragm is taken into consideration during optimization process. Evolution strategy(ES) is adopted as an optimization technique.

LNG선의 화물 하역 배관망의 과도 응답 해석에 관한 연구 (A Study on the In-Pipe Surge Analysis for Cargo Unloading Piping System of LNG Carrier)

  • 천병일;우종식
    • 대한조선학회논문집
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    • 제33권1호
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    • pp.124-134
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    • 1996
  • 본 연구에서는 LNG선의 화물하역 중 비상 상황시 펌프를 정지시키고 선박측의 긴급 차단 밸브 및 육상측의 정지 밸브를 폐쇄시킬 때, 관내 유체의 급격한 속도변화에 의하여 발생하는 비정상 유동 상태인 서지(Surge)현상의 원인을 고찰하고, 이 때 발생하는 상승압력과 유량의 변화를 계산하였다. 해석 결과에 의하면 서지현상에 의한 과도한 압력상승은 선박측의 긴급 차단 밸브 및 육상측의 정지 밸브의 종류와 이들의 폐쇄 시간, 그리고 배관 배치에 크게 영향을 받음을 알 수 있었다.

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환형관내 고-액 2상 유동의 압력손실 변화특성에 대한 연구 (A Study on the pressure loss of sloid-liquid 2 phase flow in an annulus)

  • 우남섭;한상목;황영규;윤치호;김영주
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.2720-2724
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    • 2007
  • Field measurements have revealed that the pressure drop over a borehole during drilling of a slim oil well or a well with a long reach can depend significantly on the rotation speed of the drill pipe. An accurate prediction of the annular frictional pressure drop is therefore important for conditions where the annular clearance is small. An experimental study was carried out to study solid-liquid two phase flow in a slim hole annulus. Annular velocities of carrier fluids varied from 0.2 m/s to 1.5 m/s. The carrier fluids which were utilized included tap water and CMC water solutions. Pressure drops and average flow rates were measured for the parameters such as inner-pipe rotary speed, carrier fluid velocity, hole inclination and particle injection rate. For both water and CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.

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고온용 히트파이프형 태양열 흡수기 (High-Temperature Heat-Pipe Type Solar Thermal Receiver)

  • 부준홍;정의국
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 춘계학술대회
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    • pp.668-671
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    • 2007
  • A numerical study was conducted on a simplified model of a high-temperature solar receiver which incorporates liquid-metal heat pipe. The objective of this paper is to compare the isothermal characteristics of the heat pipe receiver with the conventional receiver utilizing convection of molten salt as heat carrier. The solar receiver was assumed to be subject to a concentration ratio between 50 and 1,000 to supply high-temperature heat to a stirling engine for electric power generation. For simplicity of the analysis, a cylindrical geometry was assumed and typical dimensions were used based on available literature. The heat pipe had a shape of double-walled cavity and the working fluid was a sodium. The analysis was performed assuming that the radiation heat flux on the inner walls of the receiver was uniform, since the focus of this study was laid on the comparison of the conventional type and heat pipe type receiver. The results showed that the heat pipe type exhibited superior performance when the operating temperature becomes higher. In addition, to explore the advantage of the heat pipe receiver, the channel shape and dimensions should be adjusted to increase the heat transfer area between the wall and the heat trnasfer medium.

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진동 특성 파악을 통한 인버터 에어컨의 운전 주파수 및 파이프 형상 결정 (Determination of the Operating Frequency and Pipe Design of Inverter Air-conditioner considering Dynamic Characteristics of Inverter Rotary Compressor)

  • 모진용;이진교;박득용;김진섭
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 I
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    • pp.203-206
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    • 2001
  • The reduction of chopping noise generated from inverter compressor and the piping design reducing vibration are the most important items in the quality of air conditioner. The chopping noise is identified by the study of the relationship between carrier frequency and natural frequency of the compressor shell. The high carrier frequency is the key factor in reduction of carrier noise. To keep the natural frequencies of the system as far as away from the operating frequencies appears to be the most important factor in the design of piping system.

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Heat Transfer Characteristics of Liquid-Solid Suspension Flow in a Horizontal Pipe

  • Ku, Jae-Hyun;Cho, Hyun-Ho;Koo, Jeong-Hwan;Yoon, Suk-Goo;Lee, Jae-Keun
    • Journal of Mechanical Science and Technology
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    • 제14권10호
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    • pp.1159-1167
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    • 2000
  • Particles in liquid-solid suspension flow might enhance or suppress the rate of heat transfer and turbulence depending on their size and concentration. The heat transfer characteristics of liquid-solid suspension in turbulent flow are not well understood due to the complexibility of interaction between solid particles and turbulence of the carrier fluid. In this study, the heat transfer coefficients of liquid-solid mixtures are investigated using a double pipe heat exchanger with suspension flows in the inner pipe. Experiments are carried out using spherical fly ash particles with mass median diameter ranging from 4 to $78{\mu}m$. The volume concentration of solids in the slurry ranged from 0 to 50% and Reynolds number ranged from 4,000 to 11,000. The heat transfer coefficient of liquid-solid suspension to water flow is found to increase with decreasing particle diameter. The heat transfer coefficient increases with particle volume concentration exhibiting the highest heat transfer enhancement at the 3% solid volume concentration and then gradually decreases. A correlation for heat transfer to liquid-solid flows in a horizontal pipe is presented.

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임펄스 가진에 의한 근해역 통합채광시험 양광시스템의 파이프 동적 과도응답 해석 (Analysis of the Transient Dynamic Response of Ocean Mining Pipe System Due to Impulse)

  • 조규남;김민;박용찬;윤치호
    • 한국전산구조공학회논문집
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    • 제20권2호
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    • pp.105-111
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    • 2007
  • 본 논문에서는 극한 해상상태나 돌발적인 환경하중에서 양광시스템의 진수와 인양이 이루어질 때 발생할 수 있는 파이프의 점핑현상과 이에 의해 유발되는 파이프의 장력변화 및 위해도를 위한 해석기법을 제시하였다. 동적 과도응답 해석은 본 논문에서 제시된 기법에 의하여 여러 가지 형식의 임펄스에 대해 수행되어졌으며, 해석을 위한 모델로 KT-Submarine에서 사용하고 있는 '세계로호' 양광시스템의 진수, 인양 시스템을 선정하였다. 결과적으로 양광시스템관련 해상작업을 위한 지침이 제시되었다. 정성적인 해석기법의 검증과 비교를 위하여 ROV진수 시 발생 가능한 케이블장력 과도응답을 해석하였으며 이를 통하여, 본 연구에서 시도한 수학적 모델링과 이상화된 임펄스에 대한 파이프의 과도 응답과정이 충분한 정성적인 기초자료를 제공해 줄 수 있다는 점을 파악하였다.

히트파이프와 용융염을 사용하는 태양열 축열조의 설계 (Design of a Solar Thermal Storage System Employing Heat Pipes and Molten Salts)

  • 이정륜;부준홍
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2011년도 춘계학술발표대회 논문집
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    • pp.86-91
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    • 2011
  • Thermal design was conducted for a solar thermal storage system in a medium-temperature range between $200^{\circ}C$ and $400^{\circ}C$. The system was composed of heat pipes as heat carrier and molten salts as phase-change storage material. Each heat pipe penetrated through the storage system and had two heat-exchanging sections at both ends to interact with high-and low-temperature steams, while it exchanged heat with molten salts in the middle section. During a heat-storage mode, the heat pipes transferred heat from the hot steam at one side to the molten salts and it transferred heat from the molten salt to the cold steam at the other side during the heat-dissipating mode. A tube-bank type heat exchanger theory was applied to this design task to meet the required inlet and outlet temperatures of the steams depending on the operation modes. Several design variables were considered including the lengths of evaporator and condenser of a heat pipe, traverse and longitudinal pitches of the pipe, and the number of rows of the heat pipes for two different molten salt baths. An optimum design results were presented with discussion.

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선체 구조와의 연관성을 고려한 신속 배관 모델링 방법 (Rapid Pipe Modeling Method Considering the Relationship with a Hull Structure)

  • 노명일;최우영;이규열
    • 대한조선학회논문집
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    • 제43권2호
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    • pp.258-267
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    • 2006
  • The present piping modeling method requires detailed inputs from a designer to generate a piping model, and thus it takes much time for the designer to perform such task. Moreover, the piping model has no relation with that of hull structure. Thus, it is time-consuming and requires much effort if design changes arise. In this study, a method that generates quickly many pipes using a pipe tray and a conversion method that converts automatically the pipes into objects related with the hull structure are proposed. A piping modeling system based on the proposed methods is developed. The applicability of the developed system is demonstrated by applying it to the generation of the piping model of a deadweight 300,000ton VLCC(Very Large Crude oil Carrier). The results show that the developed system can quickly generate the piping model in relation with the hull structure.