• Title/Summary/Keyword: Marine S.W. Pump

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A Study on the Correlation Analysis of the Present Status of Positive Displacement Pumps Installed in Ships

  • Lee, Sang-Il;Kim, You-Taek
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.3
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    • pp.421-429
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    • 2008
  • Various kinds of ship are operated to transport cargo or passengers at sea in the world. Most of the important auxiliary machineries installed in those ships are fluid machineries such as pumps, compressors, and fans. A large percentage of fluid machinery is pumps which are classified turbo and positive displacement pumps. This paper analyzes only positive displacement pumps. This thesis has two aims: (a) to analyze the present status of pumps installed in merchant and training ships and (b) to find the correlation among sea going pump kW, port pump kW, total pump kW, GE kW, ME MCR, number of pumps, ME kgf, pump kgf. Based on ship's type, this paper seeks to find special characteristics as a result of analyzing head, flow rate, and kW. Moreover this paper analyzes and compares number of pumps, pump kW/ME MCR, pump kW/GE kW under the conditions of seagoing and berthing according to ship's type.

A Study on the Correlation Analysis of the Present Status of Turbo Pumps Installed in Ships

  • Lee, Sang-Il;Kim, You-Taek
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.7
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    • pp.1051-1060
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    • 2008
  • Now days, various types of ships are operated to transport both cargo and passengers all around the world. Most of the important auxiliary machinery installed in those ships is fluid machinery such as pumps, compressors, and fans. A large percentage of fluid machinery is pumps which are classified as turbo and positive displacement pumps. This paper analyzes only turbo pumps out of the two types. This thesis has two aims: (a) to analyze the present status of pumps installed in merchant and training ships and (b) to find the correlation among sea going pump kW, port pump kW, GE kW, ME MCR, number of pumps, ME kgf, pump kgf. Based on the ship's type, my paper seeks to find special characteristics as a result of analyzing head, flow rate, and kW. Moreover this paper analyzes and compares number of pumps, rpm of pumps, pump kW/ME MCR and pump kW/GE kW under the conditions of seagoing and berthing according to the ship's type. In conclusion, (1) For the exact comparison, information on the head, kW, flow rate, number of pumps by ship's type, the pump installation status of the Merchant Ships and Training Ships were tabulated and compared in this paper. (2) In order to qualify one ship as the delegate ship, several methods were used. The result of the examination indicates that the chosen ships could be justified as a suitable representation of ships of their own type. (3) The correlation of several values(total pump kW, port pump kW, GE kW, seagoing pump kW, pump weight, ME weight, ME MCR, number of pumps and ME kW) could be obtained.

Control Algorithm Development for Design of Cooling System in High-power Propulsion Motor (대용량 전기추진시스템 설계를 위한 제어알고리즘 개발)

  • Oh, Jin-Seok;Jung, Sung-Young;Kong, Yeong-Kyung;Bin, Jae-Goo;Kim, Han-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.1
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    • pp.195-201
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    • 2010
  • In this paper, a cooling system of high-power propulsion motor with Energy Saving System(ESS) is described. Normally, the cooling system for ship consists of fresh water pump, sea water pump, 3-way valve and cooler. In the cooling system, F.W(Fresh Water) and S.W(Sea Water) pump is operated on rated rpm, and the 3-way valve is controlled for preventing over-cooling. So, the consumption power of pump's motor is changed according to a sea water temperature. In the proposed cooling system, F.W. pump and S.W pump is controlled by inverter, and it is can be reduced the consumption power. Also, it is proved with simulation.

An Introduction of Pumps Installed for Marine Use (선박용 펌프의 소개)

  • Lee, Sang-Il;Lee, Young-Ho;Kim, You-Taek
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.363-366
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    • 2006
  • Various kinds of ships(Cargo ship, Passenger ship, Training ship, Special ship etc.) are operated to transport cargo or passengers at sea in the world. Most of the important auxiliary machinery which is installed are fluid machinery in those ships. A large percentage of fluid machinery is pumps which are classified turbo and non-turbo type. While much previous research has focused on pumps for shore use, very little is known about ship's pump. In order to develop an understanding of ship's pump, we introduce common pumps used in every ship and special pumps based on ship's type. This exploratory study lays the groundwork for further investigation of ship's pumps

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Internal Flow Analysis on a Mixed Flow Pump for Developing Marine Mineral Resources (해양광물자원 개발을 위한 사류형펌프의 내부유동 해석)

  • Lee, J.W.;Choi, Y.D.;Lee, Y.H.;Yoon, C.H.;Park, J.M.
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.5
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    • pp.11-16
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    • 2010
  • The development of lifting pumps that lift minerals to a mining vessel are one of the vital parts of the commercial mining process. The purpose of this study is to investigate internal flow and its effect on the performance of a mixed flow pump in order to improve the pump's performance. Numerical analysis was performed by commercial code of ANSYS CFX-11 based on flow rate and length of flexible hose. The rated rotational speed of the impeller is 1750rpm. For taking into account the turbulence, k-$\omega$ SST model was selected to guarantee more accurate prediction of flow separation. The simulated results are in good agreement with the experimental results and showed that its efficiency and the head of the pump are related mainly to the flow rate and the length of flexible hose. A lesser flow rate caused more secondary flow through the guide vane passage. The length of flexible hose and flow rate exert much more influence on the pump's performance than the shape of the flexible hose.

A Study on Efficient Capacity Control of a Marine Pump with the Variation of Sea Water Temperature (선박용 펌프의 해수온도 변화에 따른 효율적인 유량제어에 관한 연구)

  • Choi, Sang-Bom;Im, Myeong-Hwan
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.6
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    • pp.788-793
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    • 2014
  • In this study, the electrical power consumption saving effect is studied through installing an inverter which is able to control the R.P.M. of marine sea water pump by effective flow control. The study looks at how sea water pump's flow control influences on the system without the Marine Growths Protection System(MGPS). Auxiliary sea water pump and refrigerator sea water pump in training ships, which are always operated not only in harbor but also in navigation, was used in the experiment and the experiment was conducted by dividing into harbor and navigation. As a result of research, in the case the sea water temperature is under $18^{\circ}C$, the operation was possible with a 58.3 % decrease in pump R.P.M. and electric power consumption was saved by 50 %. In spite of the sea water temperature increasing upto $34^{\circ}C$, pump R.P.M. at 91.6 % was sufficient to operate with a 20 % electric power consumption saving effect. In the pipelines without MGPS, lowering R.P.M. along with lowering pressure results in the attachment of various marine growths.

Numerical Analysis of Flow through Bi-Directional Axial Pump (양방향 축류펌프의 전산유동 해석)

  • Kang, S.;Jung, W.H.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2011.06a
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    • pp.212-212
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    • 2011
  • 이 논문은 선박의 자세 안정성 유지를 위한 anti-heeling system 용 양방향 펌프에 대하여 연구하였다. 기존 양방향펌프의 기술은 모터 외장용 수직방식의 양방향 펌프를 사용해왔다. 현재는 모터내장용 양방향 펌프가 개발되고 있다. 수직방식의 양방향 펌프와 모터 내장용 양방향 펌프를 유동해석을 통하여 성능을 비교하고 앞으로 개선되어야 할 문제점에 대하여 연구하였다.

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Evaporation pressure drop of $CO_2$ in a horizontal tube (수평관내 이산화탄소의 증발 압력강하)

  • Lee Dong-Geon;Son Chang-Hyo;Oh Hoo-Kyu
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.5
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    • pp.552-559
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    • 2005
  • The evaporation pressure drop of $CO_2$ (R-744) in a horizontal tube was investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver, a variable-speed pump. a mass flow meter, a pre-heater and evaporator (test section). The test section consists of a smooth. horizontal stainless steel tube of 7.75 mm inner diameter. The experiments were conducted at mass flux of 200 to $500\;kg/m^{2}s$, saturation temperature of $-5^{\circ}C\;to\;5^{\circ}C$. and heat flux of 10 to $40\;kW/m^2$. The test results showed the evaporation pressure drop of $CO_2$ are highly dependent on the vapor qualify, heat flux and saturation temperature. The evaporation pressure drop of $CO_2$ is very lower than that of R-22. In comparison with test results and existing correlations. the best fit of the present experimental data is obtained with the correlation of Choi et al. But existing correlations failed to predict the evaporation pressure drop of $CO_2$. Therefore, it is necessary to develop reliable and accurate predictions determining the evaporation pressure drop of $CO_2$ in a horizontal tube.

An analysis on the characteristics of superheater organization of ORC system for marine waste heat recovery system(WHRS) (선박폐열회수(WHRS) ORC 시스템의 과열기 구성에 따른 특성 해석)

  • Kim, Jong-Kwon;Kim, You-Taek;Kang, Ho-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.8-14
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    • 2014
  • This research designed Waste Heat Recovery System(WHRS) generation system of 250kW whose working fluid is R-245fa and studied on cycle characteristics by superheater organization. It simulated two conditions; series connection and parallel connection between superheater and evaporator. In simulation of series connection of superheater and evaporator, output of 4.7% could be improved because of the increase of enthalpy by overheating of working fluid. When setting 250kW for target output, cycle flux could be reduced by 4.1%. When setting 250kW as a target output of cycle In parallel connection simulation of superheater and evaporator, cycle flux was reduced as flux of heat source fluid for superheater was increased. So, the maximum 7.9% of working fluid pump's electric power was reduced and there was no big change in cycle efficiency and net efficiency by flux ratio.

Study on the Evaporation Heat transfer of $CO_2$ in a Horizontal tube (수평관내의 $CO_2$의 증발 열전달에 관한 연구)

  • Jang, Seong-Il;Choi, Sun-Muk;Kim, Dae-Hui;Oh, Hoo-kyu
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.240-241
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    • 2005
  • The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and evaporator(test section). The test section was made of a horizontal stainless steel tube with the inner diameter of 4.57 mm, and length of 4 m. The experiments were conducted at mass flux of 200 to 700 kg/$m^2s$, saturation temperature of 0$^{circ}C$ to 20$^{circ}C$, and heat flux of 10 to 30 kW/$m^2$. The test results showed the evaporation heat transfer of $CO_2$ has great effect on more nucleate boiling than convective boiling. The evaporation heat transfer coefficients of $CO_2$ are highly dependent on the vapor quality, heat flux and saturation temperature. In comparison with test results and existing correlations, correlations failed to predict the evaporation heat transfer coefficient of $CO_2$, therefore, it is necessary to develop reliable and accurate predictions determining the evaporation heat transfer coefficient of $CO_2$ in a horizontal tube.

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