http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
이중 팽창기를 적용한 유기랭킨사이클 시스템의 성능특성 연구
박현준(Hyunjun Park),윤은구(Eunkoo Yun),윤상열(Sang Youl Yoon),김경천(Kyung Chun Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study targets to estimate the performance of an organic Rankine cycle (ORC) power generation system using dual expanders by simulation and experiment. The ORC system is composed of two scroll expanders installed in parallel, a hydraulic diaphragm type pump to pressurize the working fluid, two plate heat exchangers for the evaporator and condenser. The two scroll expanders were converted from two oil-free air scroll compressors with same specifications, and were tested in the ORC loop with R245fa. The heat source temperature was controlled up to 150 °C by the 150 kW-class electric water-heater. In order to evaluate the static performance of the system, efficiencies and shaft powers for both single and dual operation mode were carried out. The maximum isentropic efficiency of each expander was measured about 70 %, and the shaft power was reached to about 3 kW at the turbine inlet temperature of 140 °C. Moreover, the performance characteristics of the dual parallel expanders ORC system with regards to various heat source conditions will be addressed.