• Title, Summary, Keyword: Hybrid energy

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Study on the Safety Analysis on the Cooling Performance of Hybrid SIT under the Station Blackout Accident (발전소 정전사고 시 Hybrid SIT의 냉각성능 평가를 위한 안전해석에 관한 연구)

  • Ryu, Sung Uk;Kim, Jae Min;Kim, Myoung Joon;Jeon, Woo Jin;Park, Hyun-Sik;Yi, Sung-Jae
    • Journal of Energy Engineering
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    • v.26 no.3
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    • pp.64-70
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    • 2017
  • The concept of Hybrid Safety Injection Tank (Hybrid SIT) proposed by the Korea Atomic Energy Research Institute (KAERI) has been introduced for the purpose of application to the Advanced Power Reactor Plus (APR+). In this study, the SBO situation of the APR+ was analyzed by using the MARS-KS code in order to evaluate whether the operation of the Hybrid SIT has an effect on the cooling performance of the Reactor Coolant System (RCS). According to the analysis, when the actuation valve on the pressure balancing line (PBL) is opened, the Hybrid SIT's pressure rises rapidly, forming equilibrium with the RCS pressure; subsequently, a flow is injected from the Hybrid SIT into the reactor vessel through the direct vessel injection (DVI) line. The analysis showed that it is possible to keep the core temperature below melting temperature during the operation of a Hybrid SIT.

Energy-efficiency enhancement and displacement-offset elimination for hybrid vibration control

  • Makihara, Kanjuro
    • Smart Structures and Systems
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    • v.10 no.3
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    • pp.193-207
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    • 2012
  • New insights into our previously proposed hybrid-type method for vibration control are highlighted in terms of energy analysis, such as the assessment of energy efficiency and system stability. The hybrid method improves the bang-bang active method by combining it with an energy-recycling approach. Its simple configuration and low energy-consumption property are quite suitable especially for isolated structures whose energy sources are strictly limited. The harmful influence of the external voltage is assessed, as well as its beneficial performance. We show a new chattering prevention approach that both harvests electrical energy from piezoelectric actuators and eliminates the displacement-offset of the equilibrium point of structures. The amount of energy consumption of the hybrid system is assessed qualitatively and is compared with other control systems. Experiments and numerical simulations conducted on a 10-bay truss can provide a thorough energy-efficiency evaluation of the hybrid suppression system having our energy-harvesting system.

Finite Element Analysis on the Energy Absorption Characteristics of Hybrid Structure (충격흡수용 복합부재의 에너지 흡수특성에 관한 유한요소해석)

  • 신현우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.101-107
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    • 2004
  • Recently the objective of vehicle design was focused on the crash safety and the energy saving. For the energy saving vehicle structures must be light weight, but for the crash safety some energy absorbing elements must be added. In this paper hybrid structure which consists of a steel and a FRP was studied on the energy absorption characteristics under the impact load by finite element method. Test results of the other researchers were compared with that of computer simulation on this simple hybrid structure. Side rail of vehicle front structure was replaced with hybrid materials for the application of the vehicle structure. 35mph frontal crash simulation was performed with hybrid structure and with conventional steel structure. By the adoption of hybrid structure, the improvement of energy absorption characteristics and reduction of weight was observed under the frontal crash simulation.

A Study on the Energy Saving Hydraulic Control System using Variable Displacement Hydraulic Pump/Motor (가변 유압 펌프/모터를 이용한 유압 제어 시스템의 에너지 절감에 관한 연구)

  • 조용래;안경관
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.100-108
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    • 2003
  • This paper proposes a flywheel hybrid vehicle to solve the energy crisis problem by the exhaustion of a fossil fuel and air pollution for the conservation of environment. The proposed flywheel hybrid vehicle is composed of an accumulator and a flywheel as the energy generation and storage component and three variable displacement hydraulic pump/motors as the energy transfer devices. Flywheel has the characteristics of high energy density and easy energy absorption and consumption. The effectiveness of the energy-saving of the proposed flywheel hybrid vehicle is verified by simulation using Matlab/simulink. First of ail, analytical modeling for the flywheel hybrid vehicle is presented and simulations are performed based on the experimental efficiency data of a variable displacement pump/motor. The results of the simulation show that the effect of energy savings is realized by the proposed hybrid vehicle in 3 different city driving patterns.

Design of Hybrid Type Streetlight for Railway Station with Renewable Energy (신재생에너지를 이용한 철도역사용 복합형 가로등 설계)

  • Yoon, Yong-Ho;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2103-2108
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    • 2016
  • Energy saving is as important as developments of green energy and alternative energy. This paper describes design of hybrid type streetlight for railway station with renewable energy as photovoltaic, wind, secondary battery. In designing hybrid type streetlight for railway station, generation energy with renewable energy and reliability is strongly needed to meet the demand of railway station. In order to achieve the high performance of a streetlight, photovoltaic, wind and secondary battery system, PV tracker, monitoring and GUI system with logging function are designed. To verify of performance of hybrid type streetlight for railway station, we have demonstration test to get of generation energy and flow of energy and the results are present in this paper.

Electrochemical Characteristics of Hybrid Cell Consisting of Li Secondary Battery and Supercapacitor (리튬이차전지와 슈퍼커패시터로 구성된 하이브리드 셀의 전기화학적 특성)

  • KIM1, SANGGIL;GIL, BOMIN;HWANG, GABJIN;RYU, CHEOLHWI
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.1
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    • pp.43-48
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    • 2019
  • This study investigates the electrochemical characteristics of the hybrid cell that combined the advantageous characteristics of Li secondary battery and supercapacitor, high energy density and high power density, respectively. Electrochemical behaviors of the hybrid cell was characterized by charge/discharge, cycle and impedance tests. The hybrid cell using Li secondary battery and supercapacitor had better discharge capacity and cycle performance than that of using Li secondary battery only. Proper design of such a hybrid cell system is expected to result in substantial benefits to the well being of the Li secondary battery. The hybrid cell involving Li secondary battery for high energy density and supercapacitor for high power density may be the possible solution for future energy storage system.

Modeling of Solar/Hydrogen/DEGS Hybrid System for Stand Alone Applications of a Large Store

  • Hong, Won-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.11
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    • pp.57-68
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    • 2013
  • The market for distributed power generation based on renewable energy is increasing, particularly for standalone mini-grid applications in developing countries with limited energy resources. Stand-alone power systems (SAPS) are of special interest combined with renewable energy design in areas not connected to the electric grid. Traditionally, such systems have been powered by diesel engine generator sets (DEGS), but also hybrid systems with photovoltaic and/or wind energy conversion systems (WECS) are becoming quite common nowadays. Hybrid energy systems can now be used to generate energy consumed in remote areas and stand-alone microgrids. This paper describes the design, simulation and feasibility study of a hybrid energy system for a stand-alone power system. A simulated model is developed to investigate the design and performance of stand-alone hydrogen renewable energy systems. The analysis presented here is based on transient system simulation program (TRNSYS) with realistic ventilation load of a large store. Design of a hybrid energy system is site specific and depends on the resources available and the load demand.

Applications of MEMS-MOSFET Hybrid Switches to Power Management Circuits for Energy Harvesting Systems

  • Song, Sang-Hun;Kang, Sungmuk;Park, Kyungjin;Shin, Seunghwan;Kim, Hoseong
    • Journal of Power Electronics
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    • v.12 no.6
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    • pp.954-959
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    • 2012
  • A hybrid switch that uses a microelectromechanical system (MEMS) switch as a gate driver of a MOSFET is applied to an energy harvesting system. The power management circuit adopting the hybrid switch provides ultralow leakage, self-referencing, and high current handling capability. Measurements show that solar energy harvester circuit utilizing the MEMS-MOSFET hybrid switch accumulates energy and charges a battery or drive a resistive load without any constant power supply and reference voltage. The leakage current during energy accumulation is less than 10 pA. The power management circuit adopting the proposed hybrid switch is believed to be an ideal solution to self-powered wireless sensor nodes in smart grid systems.

Review of Energy Saving Technology of Hybrid Construction Machine

  • Yu, YingXiao;Jeong, Eunjin;Ahn, Kyoung Kwan
    • Journal of Drive and Control
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    • v.15 no.4
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    • pp.91-100
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    • 2018
  • This study focuses on the energy saving of construction machinery, especially excavators and wheel loaders coming on a backdrop of energy shortage and environment pollution. Due to the problem of the low energy efficiency and the pollution of conventional hydraulic excavators, hybrid hydraulic excavators were developed to solve this challenge. Firstly, this paper discusses the different configurations of the hybrid hydraulic excavator and recent research trend of hybrid hydraulic excavator is reviewed. Secondly, the productions and research of the construction machine companies were analyzed and finally, the future challenges of hybrid technology to the hydraulic excavator were discussed.

LASER ARC HYBRID WELDING

  • Dilthey, Ulrich;Keller, Hanno
    • Proceedings of the KWS Conference
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    • pp.162-168
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    • 2002
  • Hybrid Welding means the coupling of the energy of two different energy sources in a common process zone. This paper describes prospects in laser-arc-hybrid-welding. Different kinds of lasers ($CO_2$ laser and Nd:YAG laser) and arc processes (TIG, Plasma and GMA) are considered.

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