• Title/Summary/Keyword: 배관망해석

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PRELIMINARY DESIGN AND ECONOMICS CONSIDERATION OF P-NEW-CITY DISTRICT HEATING MAIN PIPES AND PUMPIG STATION (Flowra를 이용한 P신도시 지역난방 주 배관망 및 펌프장 예비 설계 및 경제성 검토)

  • Kim, Jin-Kwon
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.127-128
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    • 2010
  • As P-new-city is planned and constructed, district eating utilizing an existing near-by power plant's waste heat is considered as an economic and environment friendly way of providing heating to the new city. Many pipeline diameters and pumping station location and capacity were assumed, investigated and optimized, to satisfy the customers' heat demand considering common district heating pipe-network design and construction practice, and also and construction, pumping station land price and construction and the pumping energy cost during lifetime of DH systems.

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Study on Flow Deflection of Duct and Raw Coal Separation Screen (덕트 및 원탄 선별망 유동 편향에 관한 연구)

  • Semyeong Lim;Hyunbum Park
    • Journal of Aerospace System Engineering
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    • v.17 no.4
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    • pp.28-33
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    • 2023
  • In this study, computational fluid dynamics was used to analyze the flow bias generated as air supplied by a fan passes through ducts, piping, and a coal separation screen. The flow bias of the air flow is mostly caused by the spatial characteristics of the fan volute and duct, and the internal baffle and the coal separation screen at the outlet cause strong pressure losses that dampen the flow bias. ANSYS CFX was used for computational fluid dynamics, and since the baffle and the coal separation screen are shaped like perforated plates with many small holes uniformly distributed, actual modeling for analysis was not possible. Therefore, the Porous Loss Model was applied. The evaluation of the flow bias was analyzed based on the velocity distribution of the Porous Loss Model at the outlet surface of the coal separation screen obtained from the computational fluid dynamics results.

A Study About Critical Flow Characteristics and the Pipeline Network Modeling of a Pressure Regulator (I) - The Influence of a Pressure Ratio - (정압기의 임계유동 특성과 배관망해석 모델링에 관한 연구 (I) - 압력비 영향 -)

  • Shin Chang Hoon;Ha Jong Man;Lee Cheol Gu;Her Jae Young;Im Ji Hyun;Joo Won Gu
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.12 s.243
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    • pp.1291-1298
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    • 2005
  • Since the interior shape of a pressure regulator is complex and the change of fluid resistance at each operation condition is rapid and big, the pressure regulator can become the major factor that causes big loss in pipelines. So the suitable pressure regulator modeling by each operation condition is important to obtain reliable results especially in small scale pipeline network analysis. And in order to prevent the condensation and freezing problems, it is needed to confirm both whether temperature recovery is achieved after passing by the pressure regulator's narrow neck and how much amount of low temperature area that can cause condensate accumulation is distributed by various PCV models at every inlet-outlet pressure ratio. In this research, the numerical model resembling P company pressure regulator that is used widely for high pressure range in commercial, is adopted as the base model of CFD analysis to investigate pressure regulator's flow characteristics at each pressure ratio. Additionally it is also introduced to examine pressure regulator's critical flow characteristics and possibility of condensation or freezing at each pressure ratio. Furthermore, the comparison between the results of CFD analysis and the results of analytic solution obtained by compressible fluid-dynamics theory is attempted to validate the results of CFD modeling in this study and to estimate the accuracy of theoretical approach at each pressure ratio too.

A Study About Critical Flow Characteristics and the Pipeline Network Modeling of a Pressure Regulator (II) - The Influence of a Opening Ratio - (정압기의 임계유동 특성과 배관망해석 모델링에 관한 연구 (II) - 개도비 영향 -)

  • Shin Chang Hoon;Ha Jong Man;Lee Cheol Gu;Her Jae Young;Im Ji Hyun;Joo Won Gu
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.12 s.243
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    • pp.1299-1306
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    • 2005
  • The suitable pressure regulator modeling at each opening ratio and pressure ratio is very important to obtain reliable results, especially in small scale pipeline network analysis such as a pressure regulator system. And it is needed to confirm both whether temperature recovery is achieved after passing by the pressure regulator's narrow neck and how much amount of low temperature area that can cause condensate accumulation is distributed by various PCV models and driving conditions. In this research, the numerical model resembling P company pressure regulator that is used widely for high pressure range in commercial, is adopted as the base model of CFD analysis to investigate pressure regulator's flow characteristics at each pressure ratio and opening ratio. And it is also introduced to examine pressure regulator's critical flow characteristics and possibility of condensation or freezing at each pressure ratio and opening ratio. Additionally, the comparison between the results of CFD analysis and the results of analytic solution obtained by compressible fluid-dynamics theory is attempted to validate the results of CFD modeling in this study and to estimate the accuracy of theoretical approach at each pressure ratio and opening ratio too.

A Study on the System Integrity of Gas Pipeline by High Voltage Power Line in Submarine Tunnel (절점망 해석프로그램을 이용한 해저터널 내 고전압 전력케이블에 의한 가스배관의 안전성 평가 연구)

  • Bae Jeong-Hyo,;Ha Tae-Hyun,;Lee Hyun-Goo,;Kim Dae-Kyeong,
    • Journal of the Korean Institute of Gas
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    • v.5 no.4 s.16
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    • pp.21-26
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    • 2001
  • Because of the continuous growth of energy consumption, and also tile tendency to site power lines and pipelines along the same routes, the close proximity of high voltage structures and metallic pipelines has become more and more frequent. Recently, the results of assessment about a system integrity are needed in korea also when a gas pipeline is running parallel with high voltage power line in same submarine tunnel, Therefore, we analyze the system integrity(AC corrosion of pipe, melting of pipeline coating, safety of insulation flange, especially cathodic protection system which are rectifier and CI(cathodic Isolator)) resulting from the influence of high voltage power system.

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Analysis on Signal Properties due to Concurrent Leaks at Two Points in Water Supply Pipelines (상수도 배관에서 두 지점의 동시 누수에 따른 신호특징 분석)

  • Lee, Young-Sup
    • Journal of the Korean Society for Nondestructive Testing
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    • v.35 no.1
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    • pp.31-38
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    • 2015
  • Intelligent leak detection is an essential component of a underground water supply pipeline network such as a smart water grid system. In this network, numerous leak detection sensors are needed to cover all of the pipelines in a specific area installed at specific regular distances. It is also necessary to determine the existence of any leaks and estimate its location within a short time after it occurs. In this study, the leak signal properties and feasibility of leak location detection were investigated when concurrent leaks occurred at two points in a pipeline. The straight distance between the two leak sensors in the 100A sized cast-iron pipeline was 315.6 m, and their signals were measured with one leak and two concurrent leaks. Each leak location was described after analyzing the frequency properties and cross-correlation of the measured signals.

Comparative study between TVD and MOC methods for the analysis of Unsteady compressible flow in pipe network (배관망의 비정상상태 압축성 유동해석을 위한 TVD 와 MOC 방법의 비교 연구)

  • Shin Young-Seob;Sah Jong-Youb
    • 한국전산유체공학회:학술대회논문집
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    • 2000.10a
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    • pp.101-108
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    • 2000
  • Pipe network analysis is analyze all of it about pressure and volume flow rate through that are pipeline, junction, regulator and valve etc. In this study is compare TVD with MOC method for analysis of unsteady compressible flow in pipelines. Then, we calculated unsteady compressible flow for pipe network that periodic volume flow rate conditions.

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Development of Dynamic Simulation Modules for the AMBIDEXTER′s Heat Transports System (AMBIEXTER 열수송 시스템의 동적 거동 모사해석 모듈 개발)

  • 임현진;김태규;김진성;오세기
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2000.11a
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    • pp.163-171
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    • 2000
  • AMBIDEXTER 원자력 에너지 시스템은 Th$^{233}$ /U 핵주기를 이용한 용융염 핵연료가 내장형 열교환기를 포함하는 일체형 원자로 시스템을 순환하면서 1차 냉각 계통을 이루고, 독립된 온라인 정화계통에 의해 액상 용융염 핵연료 일부를 연속 추출. 처리, 재주입 함으로 노심의 핵적 자활상태를 유지한다. 이와 같은 시스템 개념은 배관망 파손에 의한 중대사고 방지, 열수송 회로와 방사성 물질 회로의 독립적 구성을 통한 효과적인 원자력 에너지 이용과 고유 안전성을 확보하는 장점을 통해 현안 원자력 문제의 근본적인 해결 방안을 제시하고 있다.(중략)

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