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한성준(Sung-Joon Han),강태욱(Tae-Wook Kang),류근수(Keon-Su Ryu),최우진(Woo-Jin Choi),홍기학(Ki-Hak Hong),정석권(Seok-Kwon Jeong) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
In this paper, PI control based on an empirical transfer function model is investigated to build up high efficiency control for a centrifugal chiller. The rotational speeds of compressors and opening angles of electronic expansion valves are regulated to follow up temperature references and to ensure high efficiency of the chiller respectively. Some static experiments were conducted to reveal relationship between COP and each demand, the rpm and opening angle. Especially, the empirical transfer model of a centrifugal chiller test unit was obtained from dynamic experimental data. The validity of the designed PI controller was proved by some experimental results using the test unit and the results were also compared to the conventional evaporating pressure control results.
정석권(Seok-Kwon Jeong),한성준(Sung-Joon Han),정영미(Young-Mi Jung) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.4
This paper describes the PI controller design based on a practical transfer function model for centrifugal water chillers. The rotational speed of a compressor and the opening angle of an electronic expansion valve were simultaneously regulated as manipulated variables to maintain temperature reference and to ensure high efficiency of the chiller. The COP according to the change in each variable was investigated by performing some static experiments, and it was reflected in the PI controller design to accomplish the high efficiency control. Especially, the practical transfer function model of the chiller was built based on the dynamic experimental data considering the strong inherent non-linearity and complexity of the chiller system. The validity of the designed PI controller was proven by some experimental results using the test facility and the results were also compared to the conventional evaporating pressure control results.
간접 냉각 방식 MGO Cooler 를 이용한 MGO 점도 제어
이헌용(Heon-Yong Lee),한성준(Sung-Joon Han),류근수(Keon-Su Ryu),박찬규(Chan-Kyu Park),최우진(Woo-Jin Choi),배종렬(Jong-Ryeol Bae),장정완(Jeong-Wan Jang),강태욱(Tae-Wook Kang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper focuses on MGO viscosity control in indirect type MGO cooler system. MGO (Marine Gas Oil) is generally used in the ship near the coast instead of HFO (Heavy Fuel Oil) for a fuel of main engine to comply with regulations. But MGO viscosity is lower than that of criteria suggested by engine maker. So MGO cooler is used to adjust MGO viscosity by controlling its temperature. This study is for temperature control through superheat and capacity control. Test results that MGO cooler satisfied with its performance, and MGO viscosity measured from 3 to 5 Cst which is a sufficient viscosity for using an engine.
간접 냉각 방식 MGO Cooler의 운전 제어 특성 평가
강태욱(Tae-Wook Kang),최우진(Woo-Jin Choi),배종렬(Jong-Ryeol Bae),장정완(Jeong-Wan Jang),한성준(Sung-Joon Han),류근수(Keon-Su Ryu),박찬규(Chan-Kyu Park) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
Recently, An effort to reduce the air pollution are proceeding not only onshore but also offshore. Nations of the world are adopted the regulations for reduction in air pollution near the coast. MGO(Marine Gas Oil) is generally used in the ship sailing near the coast instead of HFO(Heavy Fuel Oil) for a fuel of main engine to comply with regulations. But MGO viscosity is lower than that of criteria suggested by engine maker. So MGO cooler is used to adjust MGO viscosity by controlling its temperature. In this study, We try to find problems and improvements through the performance evaluation of the heat exchanger for indirect type MGO cooler system. Test results that MGO cooler satisfied with its performance, and MGO viscosity measured from 3 to 5 Cst which is a sufficient viscosity for using an engine. Hot-gas bypass is equipped with MGO cooler for coping with a suddenly decreased loads. And MGO cooler is controlled by MGO temperature which is demanded at the engine fuel system.