• Title/Summary/Keyword: Pump Simulation Software

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Characteristics of Liquid Rocket Engine Simulation System Using Control Valve (제어밸브를 이용한 액체로켓엔진 모사시스뎀 특성)

  • Lee Joons-Youp;Jung Tae-Kyu;Han Sang-Yeop;Kim Young-Mog
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.3
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    • pp.74-84
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    • 2005
  • This paper include the investigation of finding the system characteristics of facility by simulating open-type turbo-pump fed system, which has commercial control valves, using AMESIM (Advanced Modeling Environment Simulation) commercial software. After developing a flight-type control valve on the basis of the results, the system characteristics of facility for control and valve tests is estimated. Especially, one of purposes of this paper is to find PID value of each commercial control valve in the facility for system test. To find suitable control logic, PI and PID modes are also compared. This paper also introduces design parameters of valve and equipment for thrust control and TDS simulation, which are using control valves.

The Effect of a Geothermal Heat Pump and Photovoltaics Application on the Building Energy Efficiency and ZEB Certification Rating for a Non-Residential Building (지열 열펌프 및 태양광 발전 적용이 비주거용 건물의 에너지효율등급과 ZEB 인증 등급에 미치는 영향)

  • Geon Ho Moon;Chang Yong Park
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.19 no.1
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    • pp.1-13
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    • 2023
  • Many government in the world have conducted building energy performance certification program to reduce building energy consumption. In this study, a reference building and its HVAC system was modeled, and the energy load and consumption were estimated by the ECO2 program. The software is a simple building energy simulation program based on monthly calculated method. The building energy efficiency rating the the reference building was 1+ under baseline condition. The simulation results showed that the insulation performance slightly affected building energy load and consumption, but light density had a significant effect on them. The application of geothermal heat pumps gave improvement of building energy efficiency rating but it could not make it possible to get zero energy building(ZEB) certification. The ZEB 5 certification could be achieved by using photovoltaics, however getting better grade was difficult. The simulation results showed that the ZEB 4 certification, one grade higher than ZEB 5, could be attained by using more than one renewable energy source such as geothermal and solar energy in this study.

Modeling and simulation of RAON cryogenic system using EcosimPro

  • Byeongchang, Byeon;Bokuem, Kim;Denis, Groshev;Sangkwon, Jeong;Taekyung, Ki;Lingxue, Jin
    • Progress in Superconductivity and Cryogenics
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    • v.24 no.4
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    • pp.59-64
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    • 2022
  • The cryogenic system of RAON which is Korea's first heavy ion accelerator was numerically modeled and simulated. EcosimPro which is widely used off-the-shelf numerical software for a large scale cryogenic system was used for the simulation. The model of SRF TF cryogenic system, which is the testbed of cryomodule, was firstly established. The integrity of system of SRF TF was confirmed by comparison of simulation and experimental results. The cool-down strategy to minimize the thermal stress of the cavity was simulated and an optimal strategy was established. In addition, the influence of valve and pump control parameters on the cooling time was investigated, and optimal control parameters were also derived. The cryogenic system of SCL3 that is a low-energy acceleration section including 55 cryomodules, valve boxes, and helium supply lines was also modeled. The soundness of the thermal shield system and interlock system of SCL3 was investigated.

Study and Control of Photovoltaic Water Pumping System

  • Khlifi, Mohamed Arbi
    • Journal of Electrical Engineering and Technology
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    • v.11 no.1
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    • pp.117-124
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    • 2016
  • Solar photovoltaic pumping system is one of most important of renewable energy applications especially in rural areas. Besides, the control strategy for standalone solar pumping system based on induction motor and without DC/DC converter has been widely studied and discussed in the literature. This topology is of great concern due its economic issues, especially when a standard frequency converter (SFCs) with scalar control is used instead of a dedicated PV inverter. This paper proposes an external control module to generate SFCs frequency reference in order to ensure both maximum power point tracking (MPPT). We present method of modeling and control of photovoltaic pumping system based centrifugal pump controlled by new improved incremental conductance in order to optimize the price and operation of pumping system this MPPT algorithm have many advantages like can be eliminate proportional integral controller It is a low cost solution since it requires no additional power equipment. The induction motor driven pump that is powered by a solar array is controlled by the indirect field oriented control (IFOC). The effectiveness of the proposed approach is illustrated by simulations carried out under Matlab Software. The experimental results are compared with simulation results.

Real-Time Simulation of an Excavator Considering the Functional Valves of the MCV (MCV의 기능밸브를 고려한 굴삭기의 실시간 시뮬레이션)

  • Im, Yong-Hyeon;Lee, Sang-Wook;Cho, Min-Gi;Shin, Dae-Young;Hwang, Sung-Ho
    • Journal of Drive and Control
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    • v.16 no.4
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    • pp.38-47
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    • 2019
  • In this paper, a real-time simulation model of an excavator using Amesim was proposed, considered the operation of functional valves with the main control valve (MCV). The hydraulic system models including the pump and MCV have been developed. The kinematic and dynamic models of the manipulator have also been developed, to confirm the behavior of the excavator. The MCV model includes various functional valves such as the regenerative valves, holding valves, swing and boom priority valves, and regen-cut valves so that simulations similar to real excavators can be performed. Additionally, to obtain the real-time calculation performance, the parts with no major influence on the dynamic behavior were simplified, high frequency factors were removed, and parameters were optimized. The models were compared with each other through the numerical analysis with variable time-step and fixed time-step, and the results were verified by comparison with the results of the actual vehicle tests.

Numerical Analysis of Flow Rate Distribution of Diffusers with Various Shapes (다양한 디퓨저 형상의 유량 분배 특성에 관한 수치해석 연구)

  • Kim, Myoung Soo;Kim, Hoo Bae;Choi, Hyoung Gwon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.9
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    • pp.789-795
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    • 2014
  • In this study, the distribution characteristics of diffusers with various shapes that are installed in an open-type thermal storage system are numerically investigated. Four diffusers are designed to distribute a working fluid evenly through the holes on bifurcated pipes. Three-dimensional steady simulations of incompressible laminar flow are conducted using commercial software (ANSYS-FLUENT). The simulation results show that both the bidirectional header-type diffuser and the H-type diffuser distribute the working fluid evenly whereas both the unidirectional and the bidirectional diffusers distribute the working fluid unevenly. The results also show that the H-type diffuser requires a higher head of pump than the bidirectional header-type diffuser. Therefore, the bidirectional header-type diffuser is recommended for use because it enables even distribution of the working fluid and requires a low head of pump.

Energy Performance and Cost Assessment for Implementing GroundSource Heat Pump System in Military Building (군사시설 내 지열 히트펌프 시스템 적용에 따른 에너지 성능과 비용 절감 효과 평가)

  • Byonghu Sohn;Kyung Joo Cho;Dong Woo Cho
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.18 no.4
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    • pp.45-57
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    • 2022
  • The Ministry of National Defense of the Republic of Korea is showing a lot of interest in net zero-energy buildings (NZEBs) to reduce energy consumption of military facilities and to promote green growth policy in military sector. The application of building passive technologies and renewable energies is essential to achieving NZEBs. This paper analyzed energy performance and energy cost on the conventional heating and cooling system (baseline scenario) and three different alternative scenarios (ALT 1, ALT 2 and ALT 3) applied in a hypothetical military building. A building modeling and simulation software (DesignBuilder V6.1) with EnergyPlus calculation engine was used to calculate the energy consumption for each scenario. Overall, when the GSHPs are applied to both space airconditioning and domestic hot water (DHW) production, Alt-2 and Alt-3, the amount of energy consumption for target building can be greatly reduced. In addition, when the building envelope performance is increased like Alt-3, the energy consumption can be further reduced. The annual energy cost analysis showed that the baseline was approximately 161 million KRW, while Alt-3 was approximately 33 million KRW. Therefore, it was analyzed that the initial construction cost increase could be recovered within about 6.7 years for ALT 3. The results of this study can help decision-makers to determine the optimal strategy for implementing GSHP systems in military buildings through energy performance and initial construction cost assessment.

A Reduction in Pressure Ripples of Axial Piston Pumps of Bent Axis by Phase Interface (위상간섭을 이용한 사축식 액셜 피스톤 펌프의 압력 맥동 감소)

  • Kim, Kyung-Hoon;Park, Kyung-Seok;Jang, Ju-Sub;Kim, Bong-Hwan; Lee, Kyu-Won;Son, Kwon;Shin, Min-Ho
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1261-1265
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    • 2003
  • Axial piston pumps of bent axis have been commonly used in hydraulic systems because of high pressure level. best efficiency, low shear force on pistons and low operating costs. The other side, they have a few demerits like that they have the relatively high number of moving parts and more discharge pressure ripples. Especially, the discharge pressure ripples bring about vibrations and noises in hydraulic system components such as connecting pipes and control valves, so that these deteriorate the stability and accuracy of the systems. Therefore, the hydraulic systems having the axial piston pumps of bent axis require the methods to reduce the discharge pressure ripples. So, the purpose of this paper is to reduce the discharge pressure ripples by the phase interference of pressure wave and to develope the analysis model of the pumps to predict the discharge pressure ripples. In this paper, the analysis model of the axial piston pumps of bent axis was developed using the AMESim software, and the reliability of that was verified by the comparison with the experimental results. The hydraulic pipeline with a parallel line was used as the method to generate the phase interference of pressure wave. the dynamics characteristics of the hydraulic pipeline with a parallel line were analyzed by a transfer matrix method. the usefulness of the phase interference of pressure wave was investigated through the experiment and simulation. The results from the experiment and simulation said that the phase interference of pressure wave by the hydraulic pipeline with a paralle linel could reduce the discharge pressure wave of the pump well. The analysis model of the axial piston pumps of bent axis developed in this paper and the method of the phase interference by the hydraulic pipeline with a parallel line are expected to be helpful to achieve the design of the pump and to reduce the discharge pressure wave of the pump effectively.

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Dynamic Analysis on the Tail Gate System for Vehicle with the Energy Regenerative Brake of Hydraulic Driven Systems (유압 구동계 에너지 재생 브레이크를 적용한 자동차 테일게이트 개폐장치에 대한 동특성 해석)

  • Choi, Soon-Woo;Huh, Jun-Young
    • Transactions of The Korea Fluid Power Systems Society
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    • v.7 no.2
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    • pp.19-26
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    • 2010
  • The typical trunk lid system for vehicle is composed of a hinge having 4-bar link and gas lifter. Here, the energy regenerative brake of hydraulic driven systems is applied to the tail gate system for vehicle and removed the gas lifter. The new tail gate system is composed of a hydraulic pump by electric motor, a hydraulic motor, four check valves, an accumulator, a relief valve and a directional control valve. The dynamic characteristics of the hydraulic motor system, such as the surge pressure and response time, are investigated in both brake action and acceleration action. The capacity selection method of accumulator by mathematical model is based upon trial and error approach and computer simulation by AMEsim software is carried out.

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Stabilization of Water Balance of Closed Cooling Water System with Orifice (오리피스를 통한 기기냉각수 계통 Water Balance 정상화)

  • Lee, Sung Gun;Park, Jong Hwan;Lee, Eun Su
    • Plant Journal
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    • v.13 no.4
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    • pp.38-40
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    • 2017
  • This study is for stabilization of the water balance of the closed cooling water system. The pipe network analysis program is used for the water balance review, and the resistance factor correction is performed through the field measurement with the ultrasonic flowmeter to improve the reliability of the pipe network software. Based on this, it is aimed to derive optimal driving method through various case simulations.

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