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김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),김민준(Min-Jun Kim),김규진(Kyu-Jin Kim),조형석(Hyoug-Seok Cho),안성국(Seong-Kuk An) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
In this study, ice making characteristics are experimentally investigated for the ice slurry generating system which is pneumatically operated. The experimentations are conducted under the various test conditions such as chilled water inlet temperature, aqueous solution concentration, flow rate of cooling water, scraper pitch and frequency of cylinder stroke. For the above experimental conditions, ice making characteristics of the slurry ice generating system are evaluated in terms of the overall heat transfer coefficient, heat transfer rate and the amount of slurry ice generation. And the experimental results show that the heat transfer rate of the system increases as the flow rate of cooling water solution increases and the concentration of ethylene glycol and inlet temperature of chilled water decreases.
김민준(Min-Jun Kim),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박일환(Il-Hwan Park),이규칠(Kyu-Chil Lee) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.11
In this study, ice slurry generator using air cylinder was designed and manufactured to investigate the heat transfer characteristic of the ice slurry generator. The ice slurry generator has the same shape as the shell-and-tube type heat exchanger. Refrigerant is flowing in the shell side and ethylene glycol solution in the tube side. The experiment was conducted on performance of ice slurry generator using air cylinder with standard condition and the results are plotted on the time scale. The experimental tests on the various concentration of ethylene glycol solution, the various solution velocity in the tube side and the various tube size have been carried. For the above experimental conditions, ice making characteristics of the ice slurry generator are evaluated in terms of the overall heat transfer coefficient. And the experimental results show that the overall heat transfer coefficient of the system is increased as the tube size and the concentration of ethylene glycol decreases.
이규칠(Kyu-Chill Lee),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박상일(Sang-Il Park),최윤호(Yun-Ho Choi),권오경(Oh-Kyung Kwon) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This research presented the heat resistance characteristics of heat sink which is newly designed through the experiment. For the same volume and base plate of heat sinks, the experiment of heat transfer characteristics was conducted for forced convection of layered type heat sink. The heat transfer and pressure drop characteristics of the layered type heat sink were comparaed for the vsrious kinds of fin pitches, fin heights and heights of heat sink. The results show that thermal resistance is decresed as the height of heat sink increases and the fin height and fin pitch decrease. From the experimental data of layered type heat sink, the correlation equation of Nusselt number was obtained as follows ; <식 참조>
스크레이퍼형 반응기에서의 R134a를 이용한 하이드레이트 생성특성에 관한 실험적 연구
정순영(Soon-Young Jeong),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),이주동(Joo-Dong Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Because methane hydrate has high gas storage ability as much as 164m<SUP>3</SUP> in 1m<SUP>3</SUP>, it is attracting attention as a new transporter and reservoir of natural gas as a substitute for LNG. Generally, an agitator-assisted hydrate reactor has been used to produce methane hydrate, but it has drawbacks in that the hydrate formation time is long and the formation amount is small. To make up for these shortcomings an experimental study on the R134a-hydrate formation was carried out by developing a scraper-type reactor that can increase the formation amount of hydrate and decrease the hydrate reaction time. The sraper-type reactor created reaction by flowing water and gas for the hydrate formation in the internal tube and hydrate-formation by flowing cooling water in external tube. In order to investigate the performance characteristics according to experimental conditions, an experiment was carried out by changing flow rate and reaction pressure in the hydrate reactor. The results showed that the formation time of hydrate according to flow rate decreases when reaction pressure is constant and hydrate formation speed increases when the reaction pressure increases under the condition of the constant cooling water temperature.
메탄올을 이용한 써모싸이폰형 히트싱크의 성능특성에 관한 실험적 연구
이규칠(Kyu-Chil Lee),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박일환(Il-Hwan Park),권오경(Oh-Kyung Kwon),김민준(Min-Jun Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
In this article, the thermosyphon type heat sink using the methanol as a working fluid has been experimentally investgated. Experimental tests on the various working fluid charging rates, input power, and the various air velocites of thermosyphon type heat sink have been carried. For the above experimental condition, the thermosyphon type heat sink using the methanol as a working fluid has evaluated in terms of the thermal resistance. The cooling performance of thermosyphon type heat sink showed superior about 30% to extrudede heat sink In this study optimized performance has been founded that the working fluid charging rates have been thirty five percent of the total volume.
김민준(Min-Jun Kim),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박일환(Il-Hwan Park),조형석(Hyoug-Seok Cho),안성국(Seong-Kuk An) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this study, Ice slurry generator heat transfer characteristics are experimentally investigated for the ice slurry generating system with scraper which is pneumatically operated. The ice slurry generator has the same shape as the vertical double tube type heat exchanger. Refrigerant is flowing in the outside tube and ethylene glycol solution in the inside tube. Refrigerant and solution water are parallel flow type which entering bottom of generator and leaving top of generator. The experimentations are conducted under the various test conditions such as compressor speed and cooling water temperature. For the above experimental conditions, heat transfer characteristics of the ice slurry generating system are evaluated in terms of the overall heat transfer coefficient and the heat transfer rate. And the experimental results show that the heat transfer rate of the system is increased as the compressor speed increases and the cooling water temperature decreases.
공압구동형 슬러리아이스 제빙기의 제빙특성에 관한 실험적 고찰
김민준(Min-Jun Kim),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),권오경(Oh-Kyung Kwon),이규칠(Kyu-Chil Lee),박일환(Il-Hwan Park),양윤섭(Yun-Sub Yang) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
In this study, ice making characteristics are experimentally investigated for the ice slurry generating system which is pneumatically operated. The ice slurry generator has the same shape as the shell-and-tube type heat exchanger. Refrigerant is flowing in the shell side and ethylene glycol solution in the tube side. The experimentations are conducted under the various test conditions such as aqueous solution concentration, flow rate of solution and frequency of cylinder stroke. For the above experimental conditions, ice making characteristics of the slurry ice generating system are evaluated in terms of the overall heat transfer coefficient and the amount of slurry ice generation. And the experimental results show that the heat transfer rate of the system is increased as the flow rate of aqueous solution increases and the concentration of ethylene glycol decreases.
PCM을 적용한 자연대류형 수냉식 방열기의 냉각특성에 관한 실험적 연구
성대훈(Dae-Hoon Sung),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),김우승(Woo-Seung Kim),백종현(Jong-hyeon Peck) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The liquid cooling effect of a natural convection type radiator by using the PCM has been investigated experimentally. The radiator size is 423×295×83 ㎜ and PCM container size is 398×270×26 ㎜. The objective is elapsed time higher than maximum time to reach for maximum operating temperature of a general liquid cooling radiator. This study, in order to study on the effects of the phase-change phenomenon, carried out the various mass flow rate, input electric power, ambient and melting point of three type PCM. For the above experimental parameter, the melting time was performed about 180/250/560 min at input power 150 W and ambient 30℃ from using the three type PCM(PCM_S1/S2/S3) respectively. Furthermore, the effects of the thermal dissipation was decreased higher input power than lower input power at heating block and melting time of PCM. However, the effects of mass flow rate did not nearly affect of the thermal performance especially.