http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Plate and Shell 열교환기의 단상유동 열전달 및 압력강하 특성에 관한 실험적 연구
서무교,김영수 대한설비공학회 2000 설비공학 논문집 Vol.12 No.4
Plate and shell heat exchanger(P&SHE) is widely applied as evaporators or condensers in the refrigeration and air conditioning systems for their high efficiency and compactness. In order to set up the database for the design of the P&SHE, heat transfer and pressure drop characteristics for single phase flow of water in a plate & shell heat exchanger are experimentally investigated in this study. Single phase heat transfer coefficients were measured for turbulent water flow in a plate and shell heat exchangers by Wilson plot method. The shell side heat transfer resistance was varied and the overall heat transfer coefficients were measured. The single-phase heat transfer coefficients in a plate side were obtained by Wilson plot method. Single-phase heat transfer correlations based on projected heat transfer area and friction factor correlations have been proposed for single phase flow in a plate and shell heat exchanger.
고체전해질형 CO₂가스 감지 소자의 제작 및 그 동작 특성
서무교,송갑득,곽종식,이덕동 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
The raw material of solid electrolyte type CO_(2) sensor was synthesized using tetraethoxysilane, lithium methoxide, zirconium n-propoxide, and tributyle phosphate as precursors, this process was carried out at 60℃ in N_(2) ambience. The prepared material was dried and crushed into powder, and it was pressed into disk type samples. These samples were sintered at 9000 -1100℃ for 50 hours. The physical characteristics of the samples were investigated by TG/DTA, SEM and XRD. The solid electrolyte type CO_(2) sensor was fabricated and its operational characteristics were measured. The sensing characteristics of the sensor shows about 86 mV/decade for the variation of CO_(2) concentration.
pH-meter 개발을 위한 ISFET와 기준전극의 제작 및 그 동작특성
서무교,강명성,박응수,손병기 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
Ag/AgCI reference electrode, by annodic plating, with KCl or NaCl solution as inner solution and ISFET (Ion Sensitive Field Effect Transistor) are fabricated and measured their operational characteristics in order to develope pH-meter using ISFET. The fabricated ISFET and reference electrode have a good pH sensitivity, 53mV/pH, and the sensitiveity showed an excellent linearity in the range of pH 2 to pH 12. The temperature dependence of pH-meter using ISFET is measured In the range of 0°C to 70°C, and it' s result is used for temperature compensation sequence in the pH-meter signal processing system. We certify that ISFET device can used for pH measurement system that need to fast measure continously varing pH values.
Sol - Gel 법에 의한 Li 이온 - 고체 전해질의 CO2 가스 감지 특성
서무교,송갑득,곽종식,이덕동 ( Moo Gyo Seo,Kap Duk Song,jong Sik Kwak,Duk Dong Lee ) 한국센서학회 1995 센서학회지 Vol.4 No.3
Lithium ionic aolid electrclye was synthesized m in ambiencely sol-ge methxl. using tetraethyl orthosilcate, lithium metluwide, zirccmium n-prntxwide. utd trilntlle phosphate as precursors. he prepared material ryas dried and rmshed into ponder, nncl it w ns pressed into disk yux samples. $quot;These samples wcc sintemd at 0-C -11(X) fc () hours. The ply-sical characteristics of the samples acre imestigatecl ly TG D$quot; and lil) methods. CO senscn lrised on lithium ionic acdid elechwlye was fuhricated and its opxerationol characteristics were ntcsutrd. The sensing characteristics of the sensco sintered at 1(K) l show s the variation of e.m.f. OonU a.i Ei m\ decade fc the variaticm CO concentraticm at 0(l -ON) C efcerating temtxature. and goc linearit for 300-(i000 ppm.
서무교,박재홍,김영수 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.3
Plate heat exchange(PHE) will be applied to the refrigeration and air conditioning systems as evaporators or condensers for their high efficiency and compactness. The purpose of this study is the analyze the characteristics of heat transfer and pressure drop of plate heat exchanger. Numerical work was conducted using the FLUENT code k-$\varepsilon$model. Also the dependence of heat transfer coefficient and friction factor on Reynolds number was investigated. As the Reynolds number increases, it is found that heat transfer coefficient also increases, but friction factor decreases. The study examines the internal flow, thermal distribution and the pressure distribution in the channel of plate heat exchanger. The results of CFD analysis compared with experimental data, and the difference of friction factor and Nusselt number in plate heat exchanger are 10% and 20%, respectively, Therefore the CFD analysis model is effective for the performance prediction of plate heat exchanger.