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최두열(Du-Yeal Choi),이종수(Joung-Soo Lee),최현규(Hyun-Kue Choi),최순호(Soon-Ho Choi) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
Desuperheater is a passive device to control the temperature of steam in various plants. However, in spite of its simple structure, the accurate prediction of a desuperheater is very difficult because there are many designed factors for the design of a desuperheater. In this study, the theory of heat transfer phenomena in a desuperheater was developed and the various design factors are evaluated. As a results, we confirmed that the droplet size of 30 - 200㎛ is best effective for the performance of a desuperheater.
선박 및 해상플랜트용 판형 열교환기의 열전달계수 측정에 관한 연구
최순호(Soon-Ho Choi),윤석훈(Seok-Hoon Yun),김창복(Chang-Fu Jin),송영호(Young-Ho Song),전종필(Jong-Pil Jeon),최두열(Du-Yeal Choi) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
For the evaluation of a heat transfer coefficient of a plate type heat exchanger, a fresh water generator was tested with the seawater under the real operation conditions. Although many studies reported on the fresh water generator up to now, there is no report on the full-scale experiment with the seawater in the authors' acknowledgement. The heat transfer coefficient of the plate type heat exchanger was approximately estimated from the fresh water generated from seawater because the purpose of this study was aimed to develop a commercial fresh water generator not a prototype one. The experiment was carefully performed to be matched with on-the-ship operation conditions as possible. The measured heat transfer coefficient was well satisfactory compared with on-the-site anticipation and the installed plate type heat exchanger was confirmed to have the 30 Ton/Day capacity of fresh water.
MED 담수기내 수평관외에 형성되는 유하액막 유동의 수치해석 연구
김성수(Seong-Soo Kim),정효민(Hyo-Min Jeong),정한식(Han-Shik Chung),최두열(Du-Yeal Choi),조선형(Han-Shik) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In the desalination system, the flow characteristics of the falling film is very important issue to make highly efficient system. So, This study aims to investigate numerically the laminar flow in falling liquid film on horizontal cylinder. Numerical simulations are performed using a CFD code(Fluent6.3.26) for 2D configurations with one. An implicit finite difference method is carried out to solve the governing boundary layer equations. spacing. The flow modes and film thickness are reported for the Reynolds numbers range of 100 and 1000. The numerical results have been compared with the experimental correlation. The effect of cylinder separation on the film flow is investigated.
MATHEMATICAL MODELING OF CO₂ RELEASE IN MULTI-EFFECT DISTILLER
바야라 나산(Bayaraa Nasan),정효민(Hyomin Jeong),정한식(Han-Shik Chung),최두열(Du-Yeal Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The release of CO₂ in multiple-effect distillers has been barely investigated and less attention has been paid about it. Non-condensable (NC) gases accumulate in condensing zones and reduce the heat transfer for condensation. Even small amounts of NC gases have a significant adverse effect on the condensation heat transfer rate. For predicting the CO₂release rates in MED, the theory of desorption with chemical reaction was applied. The mass transfer processes and the reaction kinetics controlling the CO₂ release were described. In this paper, a mathematical model developed to understand the physical and chemical processes of CO₂ release and carbonate system in multiple-effect distiller.