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소형 유기랭킨사이클 시스템 개발 및 작동특성에 관한 연구
윤은구(Eunkoo Yun),김현동(Hyun Dong Kim),윤상열(Sang Youl Yoon),김경천(Kyung Chun Kim) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.10
본 연구에서는 소형 저온 유기랭킨사이클 시스템의 작동특성을 파악하기 위하여 R-245fa를 작동유체로 사용한 소형 ORC 발전 시스템을 설계 및 제작하였고, 다양한 저온의 열원온도에 대한 실험적 연구를 수행하였다. 저온 열원을 모사하기 위하여 최고 150 °C의 물을 공급할 수 있는 110 kW급의 전기저항 히터를 제작하였으며, 컨트롤러를 통해서 다양한 열원 온도 및 유량조건에 대한 실험이 가능하도록 구성하였다. 또한, 상용 공기용 스크롤 압축기를 이용하여 팽창기로 개조하고 동력계 및 동기식 모터와 직접 연결하였다. 로드뱅크 및 PI 제어방식을 사용하여 팽창기의 회전속도에 따른 동일 열원온도 조건에 대한 실험을 각각 수행하였으며, 소형 ORC 시스템의 성능에 영향을 미치는 다양한 인자들에 대하여 분석하고 논의하였다. Experiments were conducted to determine the operating characteristics of a small-scale ORC (organic Rankine cycle) system for various low-temperature heat sources. A small-scale ORC power generation system adopting R-245fa as a working fluid was designed and manufactured. Hot water was used as the heat source, and the temperature was controlled using 110-kW electric resistance heaters that provided temperatures of up to 150 °C. An open-drive oil-free scroll expander directly connected to a synchronous generator was installed in the ORC unit. Experiments were conducted by varying the rotational speed of the expander under the same heat source temperature conditions. The factors that influence the performance of the small-scale ORC system were analyzed and discussed.
윤은구(Eunkoo Yun),김현동(Hyun Dong Kim),김귀순(Kui Soon Kim),김장목(Jang Mok Kim),윤상열(Sang Youl Yoon),최범석(Bum Suk Choi),한상조(Sangjo Han),정양범(Yang Bum Jeong),김경천(Kyung Chun Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper presents preliminary results of development of 200 kW-class organic Rankine cycle(ORC) system that consists of two shell & tube type heat exchangers for the evaporator and the condenser, a multi-stage centrifugal pump to feed R-245fa refrigerant into the evaporator, a turbine-generator module expected to deliver a power about 200 kW and an electric generator. Back-to-back 2-stage turbine was adopted to increase expansion ratio up to 9.5 for achieving high thermal efficiency. The design point of rotational speed of the turbine was 15,000 rpm. The 2 MW electric heater which can supply hot water as heat source was installed. The electric power output, thermal efficiency, turbine isentropic efficiency, mass flow rate and expander outlet temperature have been analyzed. Futhermore, the experimental results of turbine performance was compared with CFD analysis results.
하이브리드 Tri-generation 가스엔진-유기랭킨사이클 시스템의 설계 및 열역학적 해석
성태홍,윤은구,김현동,최정환,채정민,조영아,김경천 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.1
In a gas engine, the exhaust and the engine cooling water are generated. The engine cooling watertemperature is 100 ℃ and the exhaust temperature is 500 ℃. The amount of heat of engine cooling water is43 kW and the amount of heat of exhaust is 21 kW. Eight different hybrid organic Rankine cycle (ORC) systemconfigurations which considering different amount and temperature of waste heat are proposed for two gas enginetri-generation system and are thermodynamically analyzed. Simple system which concentrating two different wasteheat on relatively low temperature engine cooling water shows highest thermal efficiency of 7.84% with pressureratio of 3.67 and shaft power of 5.17 kW.
전병국,윤은구,배황,양진화,류성욱,방윤곤,이성재,박현식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
A two-phase natural circulation test using SMART integral test loop (SMARTeITL) was conducted toexplore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically,the test examined the natural circulation in the primary loop under a stepwise coolant inventoryloss while keeping the core power constant at 5% of the scaled full power. Based on the test results, threeflow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation(TPNC), and boilerecondenser natural circulation (BCNC). The flow rate remained steady in the SPNC,slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulationflow map, the natural circulation characteristic in the SMARTeITL was compared with those inpressurized water reactor simulators. In the SMARTeITL, a BCNC regime appeared instead of siphoncondensation and reflux condensation regimes because of the use of once-through steam generators. © 2021 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under th
배황,전지한,윤은구,정영종,임성원,박현식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
The natural circulation phenomena occurring in fully integrated nuclear reactors are associated with aunique formation mechanism. The phenomenon results from a structural feature of these reactorsinvolving upward flow from the core, located in the central-bottom region of a single vessel, anddownward flow to the steam generator in the annulus region. In this study, to understand the naturalcirculation in a single vessel involving a multi-layered flow path, single-phase and two-phase naturalcirculation tests were performed using the SMART-ITL facility, and validation analysis of the TASS/SMR-Scode was performed by comparing the corresponding test results. Three single-phase natural circulationtests were sequentially conducted at 15%, 10%, and 5% of full-scaled core-power without RCP operation,following which a two-phase natural circulation test was successively conducted with an artificialdischarge of coolant inventory. The simulation capability of the TASS/SMR-S code with respect to thenatural circulation phenomena was validated against the test results, and somewhat conservative butreasonably comparative results in terms of overall thermalhydraulic behavior were shown
가스 엔진 배열을 이용한 유기랭킨사이클 시스템의 열역학적 해석
성태홍(Taehong Sung),윤은구(Eunkoo Yun),김현동(Hyun Dong Kim),최정환(Jeong Hwan Choi),채정민(Jeong Min Chae),조영아(Young Ah Cho),김경천(Kyung Chun Kim) 한국가스학회 2015 한국가스학회지 Vol.19 No.2
가솔린 엔진에서 개조된 가스 엔진에서 발생하는 냉각수와 배기가스를 분석하여 복합발전 시스템에서 활용 가능한 폐열의 양과 질을 확인하였다. 엔진 배기가스의 온도는 573.8 ℃이고, 엔진 출구 냉각수의 온도는 85.7 ℃이고, 폐열의 양은 엔진 냉각수가 배기가스에 비교하여 두 배 수준이었다. 두 가지 폐열의 상이한 온도와 양에 대응하는 유기랭킨사이클 (Organic Rankine Cycle: ORC) 발전시스템을 설계하고 열역학적 분석을 수행하였다. The amount and quality of waste heat from a gas engine which is modified from an automobile gasoline engine is analyzed. Exhaust temperature is 573.8 ℃ and engine cooling water exit temperature is 85.7℃. The amount of waste heat of engine cooling water is double compared to that of exhaust gas. Organic Rankine cycle (ORC) system is designed for two different waste heat source of engine cooling water and engine exhaust and is thermodynamically analyzed.
1kW급 유기랭킨사이클용 스크롤 팽창기의 성능 특성에 관한 실험적 연구
김도균(Dokyun Kim),윤은구(Eunkoo Yun),윤상열(Sang Youl Yoon),김경천(Kyung Chun Kim) 한국가스학회 2015 한국가스학회지 Vol.19 No.4
스크롤 팽창기의 성능특성은 유기랭킨사이클 (ORC) 시스템의 성능에 가장 중요한 변수이다. 본 연구에서는 1kW급 ORC 시스템을 구성하여 다양한 작동 조건에서 스크롤 팽창기의 성능특성을 파악하였다. ORC 시스템은 증발기, 스크롤 팽창기, 응축기, 작동유체펌프로 구성되어 있으며, 작동유체로 R245fa를 사용하였다. 고온수 온도는 50kW급 전기히터에 의해 80℃에서 115℃까지 제어되었다. 스크롤 팽창기의 최대 등엔트로피 효율은 77% 로 측정되었고, ORC 시스템의 축동력은 열원의 온도 조건 및 팽창기의 회전속도에 따라 0.5kW에서 1.8kW까지 측정되었다. The performance characteristics of a scroll expander is the most important variable for the performance of organic Rankine cycle system. In this paper, the performance characteristics of a scroll expander was identified using 1kW class organic Rankine cycle system with various operating conditions. The ORC system is composed of an evaporator, a scroll expander, a condenser and a working fluid feed pump that uses R245fa as working fluid. The hot water temperature was controlled from 80℃ to 115℃ by the 50kW-class electric water-heater. The maximum isentropic efficiency of the scroll expander was measured about 77%, and the shaft power was measured from 0.5 kW to 1.8 kW according to heat source temperatures.