• Title/Summary/Keyword: 증기이젝터

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An Experimental Study on the Performance Characteristics of Steam Ejector (증기 이젝터의 성능특성에 관한 실험적 연구)

  • 김경식;이종수;김원영;김경근
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.5
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    • pp.30-37
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    • 1991
  • Steam ejector systems are widely used for the evacuation systems because of their high working confidence and simlicity. And recently these are used as the thermo-compressors in various energy saving systems. In this practical experiment, we have obtained the results as follows : (1) The velocity coefficient of the motive steam nozzle was 0.92-0.98. (2) The optimal area ratio was 0.00625 at pressure ratio 5.2 and expansion ratio 101.3. (3) The performance and efficiency of the steam ejector were mainly affected by the axial position of nozzle. (4) The good performance of the domestic manufactured steam ejector was confirmed in comparison with the foreign one. And by experimental results, we have carried out the improvement of Computer Aided Design Program of steam ejector which will be helpful for systematic research into the steam ejector.

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Performance Characteristics of OTEC(Ocean Thermal Energy Conversion) Power Cycle with Vapor-Liquid Ejector (증기-액 이젝터를 적용한 해양온도차발전 시스템의 성능 특성)

  • Yoon, Jung-In;Son, Chang-Hyo;Kim, Hyeon-Uk;Ha, Soo-Jung;Lee, Ho-Saeng;Kim, Hyun-Ju
    • Journal of Power System Engineering
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    • v.18 no.5
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    • pp.88-93
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    • 2014
  • In this paper, the performance analysis of condensation and evaporation capacity, turbine work and efficiency of the OTEC power system using vapor-liquid Ejector is presented to offer the basic design data for the operating parameters of the system. The working fluid used in this system is $CO_2$. The operating parameters considered in this study include the vapor quality at heat exchanger outlet, pressure ratio of ejector and inlet pressure of low turbine, mass flow ratio of separator at condenser outlet. The main results were summarized as follows. The efficiency of the OTEC power cycle has an enormous effect on the mass flow ratio of separator at condenser outlet. With a thorough grasp of these effects, it is possible to design the OTEC power cycle proposed in this study.

A study on the Computer-Aided Design of steam ejector (증기 이젝터의 자동설계를 위한 전산프로그램의 개발)

  • 김경근;김용모;강신돌
    • Journal of Advanced Marine Engineering and Technology
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    • v.11 no.3
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    • pp.53-60
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    • 1987
  • Steam ejector is a equipment which compresses the gases to desired discharge pressure. It is widely used for the evacuation systems because of its high working confidence. And recently it is used as the thermo-compressors in the various energy saving systems. Steam ejector is constructed of three basic parts; a suction chamber, a motive nozzle and a diffuser. The high velocity stream jet of steam emitted by the motive nozzle creats suction chamber, which draws the low pressure gases. The diffuser converts the kinetic energy of high velocity flow to pressure energy. It is not easy to determine the dimensions of a steam ejector met to the desired design condition, because that the expected suction rates must be obtained by reapeating the complicate calculation. And also such a calculation is concomitant with geometrical analysis for suction part and diffuser based on the stability of steam flow. Therefore, it is considered that the Computer-Aided Design (CAD) of steam ejector is a powerful design method. In this paper, computer program for steam ejector design is developed based on the theoretical research and the previous experimental results. And the determinating method of diffuser inlet angle and the velocity development profile of suction gas along to the diffuser are suggested. The validity of the development profile of suction gas along to the diffuser are suggested. The validity of the developed computer results with other's for the practical design calculation of a manufactured steam ejector.

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Performance Analysis of 1MW Organic Rankine Cycle with Liquid-Vapor Ejector using Effluent from Power Plant (화력발전소 폐열에 따른 작동유체별 액-증기 이젝터를 적용한 1MW급 ORC의 성능 분석)

  • Kim, Hyeon-Uk;Yoon, Jung-In;Son, Chang-Hyo
    • Journal of Power System Engineering
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    • v.18 no.6
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    • pp.120-125
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    • 2014
  • In this paper, suitable working fluid of 1MW Organic Rankine Cycle(ORC) with liquid-vapor ejector using effluent from power plant is selected. The results of comparison performance of 5 refrigerants are as follows; R600a, R134a, R1270, R236fa, R235fa. The operating parameters considered in this study include the condensation capacity evaporation capacity and efficiency. As a result of comparison of basic ORC system and with liquid-vapor ejector, with ORC system presents the higher system efficiency since the ejector makes the turbine outlet pressure lower than condensation pressure through its pressure recovery. Also, this ejector ORC system is advantageous in miniaturizing the size of components owing to decrease of evaporation capacity and condensation capacity.

Improvement of Efficiency of Kalina Cycle and Performance Comparison (Kalina 사이클의 효율 향상 방안 및 성능 비교)

  • Yoon, Jung-In;Son, Chang-Hyo;Choi, Kwang-Hwan;Son, Chang-Min;Seol, Sung-Hoon;Lee, Ho-Saeng;Kim, Hyeon-Ju
    • Journal of the Korean Solar Energy Society
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    • v.35 no.5
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    • pp.11-19
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    • 2015
  • In this paper, EP-Kalina cycle applying liquid-vapor ejector and motive pump is newly proposed. In this EP-Kalina cycle, the liquid-vapor ejector is used to increase pressure difference between inlet and outlet of the turbine. Also the motive pump enhances the performance of liquid-vapor ejector, resulting in increase of system efficiency of OTEC cycles. The comparison cycles in this study are basic, Kalina, EKalina and EP-Kalina ones. The pump work, net power, APRe, APRc, TPP and system efficiency of each cycle are compared. In case of net power, EP-Kalina cycle is lowest among the cycles due to the application of the motive pump. But, the net power difference of cycles seems to be minor since the pump work of cycles is merely about 1kW, compared to turbine gross power of 20kW. The system efficiency of EP-Kalina cycle shows 3.22%, relatively 44% higher than that of basic OTEC cycle. Therefore, the system efficiency is increased by applying the liquid-vapor ejector and the motive pump. Additional performance analysis is necessary to optimize the proposed EP-Kalina cycle.