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VCHP에서 불응축 가스량이 열전달 성능에 미치는 영향에 관한 실험적 연구
박기호(K. H. Park),이기우(K. W. Lee),이욱현(W. H. Lee),이계중(K. J. Lee),서정세(J-S. Suh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper is to research the heat transfer characteristic in copper-water variable<br/> conductance heat pipes(VCHP) with a non-condensable gas and gas reservoir. The heat transfer<br/> characteristics in the VCHP have not yet been studied much researches. VCHP are used in<br/> many applications. These applications range from thermal control of components and systems on<br/> satellites, to precise temperature calibration duties, conventional electronics temperature control<br/> and thermal diodes. The practical use of VCHP is a simple way to control the temperature of<br/> satellites. As the quantity of NCG was increased, there was an increase in the saturation vapor<br/> temperatures. As the input heat has loaded from 90 W to 110 W, the difference of the<br/> evaporator surface is lower than 10°C.
다공성소결윅구조에 따른 루프 히트파이프에서 압력손실의 이론적 분석
이기우(K. W. Lee),이욱현(W. H. Lee),박기호(K. H. Park),이계중(K. J. Lee),전원표(W. P. Chun),인현만(H. M. Ihn) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this paper, the pressure drops were investigated according to the sintered porous wick structure in loop heat pipe(LHP) by theoretical analysis. LHP has the wick only in evaporator for the circulation of working fluid, so utilizes porous wick structure which pore diameter is very small for large capillary force. This paper investigates the effects of different parameters on the pressure drops of the LHP such as particle daimeter of sintered porous wick, wick porosity, vapor line diameter, thickness of wick and heating capacity. Working fluid is water and the material of sintered porous wick is copper. According to the these different parameters, capillary pressure, pressure drop in wick were analized by theoretical design method of LHP.
김성일(S. I. Kim),전원표(W. P. Chun),이욱현(W. H. Lee),이기우(K. W. Lee),이계중(K. H. Park),박기호(K. J. Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The application of high velocity air jets to heat transfer surface has tremendous engineering potential in various industries. The impinging jets are therefor widely used for their enhanced transport characteristics, especially for drying of continuous materials such as sheet, film, carpets, forming materials and pallets. This paper presents drying characteristics of pulp mould (non-uniformed material) and perform the test with the change of operating conditions in conveyer band dryer using the impinging jet nozzles. The test result conveyer band dryer confirmed the factors influencing drying rate and the design data of band dryer using the impinging jet dryer obtained.
스크린 메쉬형 가변전열 히트파이프에서 NCG양에 따른 작동특성 변화
서정세(J.S. Suh),박영식(Y.S. Park),강창호(C.H. Kang),정경택(K.T. Chung),박기호(K.H. Park),이기우(K.W. Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Experimental study is performed to investigate the effect of heat load and operating temperature on the thermal performance of a heat pipe with screen mesh wick. The heat pipe was designed in 200 screen meshes, 500㎜ length and 12.7㎜ O.D tube of copper, water as working fluid(4.8g) and nitrogen as non-condensible gas(NCG). The heat pipe used in this study has evaporator, condenser and adiabatic section, respectively. Experimental data of axial wall temperature distribution is presented for heat transport capacity, the temperature of cooling water of condenser, inclination angle, and operating temperature. For the results from this study, it is found that, for the same charging mass of working fluid, the initial operating temperature and the overall wall temperatures of heat pipe are higher for NCG charging mass of 5.0×10??㎏ and 3.4×10??㎏, than that of 1.0×10??㎏.
전원표(W. P. Chun),이기우(K. W. Lee),박기호(K. H. Park),이계중(K. J. Lee),황휘우(H. W. Hwang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
An experimental study was carried out on the drying characteristics of organic sludge particles in rotary dryer. The effect of various operating parameter such as feed rate, particle size, hot air<br/> temperature, and velocity on the drying rate was analysed. The results showed that the evaporation velocity was increased by 22~27% when the hot air temperature changed from 160℃ to 270℃ in the constant drying rate period. In particular, the empirical formula was obtained, which was the volumetric heat transfer coefficient from the relationship between panicles and hot air stream.