• Title/Summary/Keyword: 브레이튼 사이클

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역 브레이튼 사이클을 이용한 산업용 가스터빈의 성능 향상에 관한 연구

  • 공창덕;김경두;기자영;최인수;노홍석
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2000.11a
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    • pp.18-18
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    • 2000
  • 산업용 가스터빈에서 대기로 방출되는 배기열을 효과적으로 이용하기 위한 역 브레이튼 사이클 가스터빈(Reverse Brayton Cycle Gas Turbine) 엔진의 출력과 비연료 소비율 및 열효율을 기본 브레이튼 사이클 엔진, 재열사이클에 역 브레이튼 사이클을 추가한 엔진, 역 브레이튼 사이클에 중간냉각기를 추가한 엔진의 출력, 비연료 소비율 및 열효율을 비교하였다.(중략)

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Research on the Development of the Supercritical CO2 Dual Brayton Cycle (초임계 이산화탄소 이중 브레이튼 사이클 개발 연구)

  • Baik, Young-Jin;Na, Sun Ik;Cho, Junhyun;Shin, Hyung-Ki;Lee, Gilbong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.10
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    • pp.673-679
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    • 2016
  • Because of the growing interest in supercritical carbon dioxide power cycle technology owing to its potential enhancement in compactness and efficiency, supercritical carbon dioxide cycles have been studied in the fields of nuclear power, concentrated solar power (CSP), and fossil fuel power generation. This study introduces the current status of the research project on the supercritical carbon dioxide power cycle by Korea Institute of Energy Research (KIER). During the first phase of the project, the un-recuperated supercritical Brayton cycle test loop was built and tested. In phase two, researchers are designing and building a supercritical carbon dioxide dual Brayton cycle, which utilizes two turbines and two recuperators. Under the simulation condition considered in this study, it was confirmed that the design parameter has an optimal value for maximizing the net power in the supercritical carbon dioxide dual cycle.

The maximum power condition of the Brayton cycle with heat exchange processes (熱交換 過程 을 考慮한 브레이튼 사이클 의 最大出力條件)

  • 정평석;차진걸;노승탁
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.9 no.6
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    • pp.795-800
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    • 1985
  • The ideal Brayton cycle has been analyzed with the heat exchange processes between the working fluid and the heat source and the sink while their heat capacity rates are constant. The power fo the cycle can be expressed in terms of a temperature of the cycle and the heat capacity rate of the working fluid. There exists an optimum power condition where the heat capacity rate of the working fluid has a value between those of the heat source and the heat sink, and the cycle efficiency is determined by the inlet temperatures of the heat source and the sink.

Simulation of a Supercritical Carbon Dioxide Power Cycle with Preheating (예열기를 갖는 초임계 이산화탄소 동력 사이클의 시뮬레이션)

  • Na, Sun-Ik;Baik, Young-Jin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.10
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    • pp.787-793
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    • 2015
  • In response to the growing interest in supercritical carbon dioxide ($S-CO_2$) power cycle technology because of its potential enhancement in compactness and efficiency, the $S-CO_2$ cycles have been studied intensively in the fields of nuclear power, concentrated solar power (CSP), and fossil fuel power generation. Despite this interest, there are relatively few studies on waste heat recovery applications. In this study, the $S-CO_2$ cycle that has a split flow with preheating was modeled and simulated. The variation in the power was investigated with respect to the changes in the value of a design parameter. Under the simulation conditions considered in this study, it was confirmed that the design parameter has an optimal value that can maximize the power in the $S-CO_2$ power cycle that has a split flow with preheating.

Exergy Analysis of Regenerative Wet-Compression Gas-Turbine Cycles (습식 압축을 채용한 재생 가스터빈 사이클의 엑서지 해석)

  • Kim, Kyoung-Hoon;Kim, Se-Woong;Ko, Hyung-Jong
    • Journal of Energy Engineering
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    • v.18 no.2
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    • pp.93-100
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    • 2009
  • An exergy analysis is carried out for the regenerative wet-compression Brayton cycle which has a potential of enhanced thermal efficiency owing to the reduced compression power consumption and the recuperation of exhaust energy. Using the analysis model, the effects of pressure ratio and water injection ratio are investigated on the exergy efficiency of system, exergy destruction ratio for each component of the system, and exergy loss ratio due to exhaust gas. The results of computation for the typical cases show that the regenerative wet-compression gas turbine cycle can make a notable enhancement of exergy efficiency. The injection of water results in a decrease of exergy loss of exhaust gas and an increase of net power output.

Design of Thermodynamic Cycle and Cryogenic Turbo Expander for 2 kW Class Brayton Refrigerator (2 kW급 브레이튼 냉동기용 열역학 사이클 및 극저온 터보 팽창기 설계)

  • Lee, Jinwoo;Lee, Changhyeong;Yang, Hyeongseok;Kim, Seokho
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.2
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    • pp.299-305
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    • 2016
  • The High Temperature Superconducting power cables (HTS power cables) become increasingly longer to commercialize the HTS power cable system. Accordingly, demands on refrigerators of large cooling capacity per a unit system have been increased. In Korea, it is currently imported from abroad with the high price due to insufficient domestic technologies. In order to commercialize the HTS power cables, it is necessary to develop the refrigerators with large cooling capacity. The Brayton refrigerators are composed of recuperative heat exchangers, compressors and cryogenic turbo expanders. The most directly considering the efficiency of the Brayton refrigerator, it depends on performance of the cryogenic turbo expander. Rotating at high speed in cryogenic temperature, the cryogenic turbo expanders lower temperature by expanding high pressure of a helium or neon gas. In this paper, the reverse Brayton cycle is designed and the cryogenic turbo expander is designed in accordance with the thermodynamic cycle.

The Maximum Power Condition of the Endo-reversible Cycles (내적가역 사이클의 최대출력 조건)

  • 정평석;김수연;김중엽;류제욱
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.1
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    • pp.172-181
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    • 1993
  • Pseudo-Brayton cycle is defined as an ideal Brayton cycle admitting the difference between heat capacities of working fluid during heating and cooling processes. The endo-pseudo-Brayton cycle which is a pseudo-Brayton cycle with heat transfer processes is analyzed with the consideration of maximum power conditions and the results were compared with those of the endo-Carnot cycle and endo-Brayton cycle. As results, the maximum power is an extremum with respect to the cycle temperature and the flow heat capacities of heating and cooling processes. At the maximum power condition, the heat capacity of the cold side is smaller than that of heat sink flow. And the heat capacity of endo-Brayton cycle is always between those of heat source and sink flows and those of the working fluids of pseudo-Brayton cycle. There is another optimization problem to decide the distribution of heat transfer capacity to the hot and cold side heat exchangers. The ratios of the capacies of the endo-Brayton and the endo-pseudo-Braton cycles at the maximum power condition are just unity. With the same heat source and sink flows and with the same total heat transfer caqpacities, the maximum power output of the Carnot cycle is the least as expected, but the differences among them were small if the heat transfer capacity is not so large. The thermal efficiencies of the endo-Brayton and endo-Carnot cycle were proved to be 1-.root.(T$_{7}$/T$_{1}$) but it is not applicable to the pseudo-Brayton case, instead it depends on comparative sizes of heat capacities of the heat source and sink flow.w.

Performance Characters of the Ramjet Based on Ideal Brayton Cycle (이상 브레이튼 사이클에서의 램 제트 추진기관 성능의 기본 특성)

  • 이태호
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2003.10a
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    • pp.117-121
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    • 2003
  • In order to investigate the performance characters of the ramjet propulsion, at the first step, in this paper Ideal Brayton cycle is adopted. In the Ideal Ramjet cycle some of the Parameters are independent of the heat input, for example thermal efficiency but in the Ideal Brayton cycle, Mach number and the entry temperature of the combustion chamber are important variables with the heat input.

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