• Title/Summary/Keyword: 칼리나 사이클 시스템

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Performance analysis of an organic Rankine cycle for ocean thermal energy conversion system according to the working fluid and the cycle (작동유체 및 사이클에 따른 해양온도차발전용 유기랭킨사이클의 성능분석)

  • Kim, Jun-Seong;Kim, Do-Yeop;Kim, You-Taek;Kang, Ho-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.881-889
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    • 2015
  • Ocean thermal energy conversion is an organic Rankine cycle that generates power using the temperature difference between surface water and deep water. This study analyzes the thermodynamic efficiency of the cycle, which strongly depends on the working fluid and the cycle configuration. Cycles studied included the classical simple Rankine cycle, Rankine cycles with an open feedwater heater and an integrated regenerator, as well as the Kalina cycle. Nine kinds of simple refrigerants and three kinds of mixed refrigerants were investigated as the working fluids in this study. Pinch-point analysis that set a constant pinch-point temperature difference was applied in the performance analysis of the cycle. Results showed that thermodynamic efficiency was best when RE245fa2 was used as the working fluid with the simple Rankine cycle, the Rankine cycles with an open feedwater heater and an integrated regenerator, and when the mixing ratio of $NH_3/H_2O$ was 0.9:0.1 in the Kalina cycle. If the Rankine cycles with an open feedwater heater, an integrated regenerator, and the Kalina cycle were used for ocean thermal energy conversion, efficiency increases could be expected to be approximately 2.0%, 1.0%, and 10.0%, respectively, compared to the simple Rankine cycle.

Thermodynamic Performance Characterictics of a Tri-Cogeneration System Based on Kalina Cycle Driven by Renewable Energy (신재생에너지로 구동되는 칼리나 사이클 기반 삼중 병합 생산 시스템의 열역학적 성능 특성)

  • HAN, CHUL HO;KIM, KYOUNG HOON;JUNG, YOUNG GUAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.649-655
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    • 2021
  • The recently proposed Kalina based power and cooling cogeneration cycles (KPCCCs) have shown improvement in the energy utilization of the system compared to the basic Kalina cycle. This paper suggests a combined tri-cogeneration system for power, heating and cooling based on the Kalina cycle. And thermodynamic performances of the suggested system based on the first and second thermodynamic laws are parametrically investigated with respect to the ammonia mass fraction and the boiler pressure. Results showed that the thermodynamic performance of the system could be greatly improved compared to the former KPCCCs.

Comparative Exergy Analysis of Kalina and Organic Rankine Cycles for Conversion of Low-Grade Heat Source (저등급 열원의 변환을 위한 칼리나 사이클과 유기 랭킨 사이클의 엑서지 성능의 비교 해석)

  • KIM, KYOUNG HOON;JUNG, YOUNG GUAN;KO, HYUNG JONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.1
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    • pp.105-111
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    • 2020
  • The organic Rankine cycle (ORC) and the Kalina cycle system (KCS) are being considered as the most feasible and promising ways to recover the low-grade finite heat sources. This paper presents a comparative exergetical performance analysis for ORC and Kalina cycle using ammonia-water mixture as the working fluid for the recovery of low-grade heat. Effects of the system parameters such as working fluid selection, turbine inlet pressure, and mass fraction of ammonia on the exergetical performance are parametrically investigated. KCS gives lower lower exergy destruction ratio at evaporator and higher second-law efficiency than ORC. The maximum exergy efficiency of ORC is higher than KCS.

Simulation of a geothermal power generation system using the Kalina cycle (칼리나 사이클을 이용한 지열발전 시스템의 시뮬레이션)

  • Chang, Ki-Chang;Baik, Young-Jin;Kim, Min-Sung;Lee, Young-Soo;Park, Seong-Ryong;Ra, Ho-Sang
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.626-629
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    • 2008
  • In this study, a geothermal power generation system using the Kalina cycle was investigated by the simulation method. The Kalina cycle system can be used for the utilization of a low-temperature heat sources such as geothermal and industrial waste heat that are not hot enough to produce steam. The sea/river water can be considered as a cooling media. A steady-state simulation model was developed to analyze and optimize its performance. The model contains a turbine, a pump, an expansion valve and heat exchangers. The turbine and pump were modelled by an isentropic efficiency, while a condenser, an evaporator and a regenerative heat exchanger were modeled by UA-LMTD method with a counter-flow assumption. The effect of the ammonia fraction at the separator inlet on the cycle performance is investigated in detail.

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A Study on the Thermodynamic Cycle of OTEC system (해양 온도차발전 시스템의 열역학 사이클에 대한 연구)

  • Kim, Nam-Jin;Shin, Sang-Ho;Chun, Won-Gee
    • Journal of the Korean Solar Energy Society
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    • v.26 no.2
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    • pp.9-18
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    • 2006
  • In this paper, the thermodynamic performance of OTEC cycle was examined. Computer simulation programs were developed for simple Rankine cycle, regenerative Rankine cycle, Kalina cycle, open cycle and hybrid cycle. For the simple Rankine cycle, the results show that newly developed fluids such as R410A and R32 that do not cause stratospheric ozone layer depletion perform as well as R22 and ammonia. Also, simple Rankine cycle OTEC power plant can practically generate electricity when the difference in warm and cold sea water inlet temperatures are greater than $14^{\circ}C$. The regenerative Rankine cycle showed a 1.5 to 2% increase in energy efficiency compared to the simple Rankine cycle while the Kalina cycle employing ammonia/water mixture showed a 2-to-3% increase in energy efficiency, and the overall cycle efficiencies of hybrid cycle and open cycle were 3.35% and 4.86%, respectively.

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.

Theoretical Analysis on the Factors Affecting the Power Efficiency of the Kalina Cycle (칼리나 사이클의 발전효율에 영향을 미치는 요소에 관한 이론적 해석)

  • Lee, Ki-Woo;Chun, Won-Pyo;Shin, Hyeon-Seung;Park, Byung-Duck
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.9
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    • pp.5425-5433
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    • 2014
  • This study examined the effects of the key parameters on the power efficiency of the waste heat power plant using the EES program to obtain data for the design of the 20kW Kalina power plant. The parameters include the ammonia mass fraction, vapor pressure, heat source temperature, and the cooling water temperature. According to the analyses, a lower ammonia mass fraction and a higher vapor pressure increase the efficiency, in general. On the other hand, this study shows that there is a specific region with a very low ammonia mass fraction, where the efficiency decreases with ammonia mass fraction. Regarding the vapor pressure at the turbine inlet, the power efficiency increases with increasing vapor pressure. In addition, it was found that the influence of the vapor pressure on the efficiency increases with increasing ammonia mass fraction. Finally, the optimal condition for the maximum power efficiency is defined in this study, i.e., the maximum efficiency was 15% with a 25bar vapor pressure, $160^{\circ}C$ heat source temperature, $10^{\circ}C$ cooling water temperature, and 0.4 ammonia mass fraction.