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지하수 이용을 위한 열교환기 개발. I - 냉각핀의 설계제작 -
이운용,안덕현,김상철,박우풍,강용구,김선배,Lee, W.Y.,Ahn, D.H.,Kim, S.C.,Park, W.P.,Kang, Y.G.,Kim, S.B. 국립한국농수산대학교 교육개발센터 2002 현장농업연구지 = Journal of practical agricultural resear Vol.4 No.1
This study was conducted to develop the heat exchanger by utilizing the heat energy of underground water(15℃), which might be used for cooling and heating system of the agricultural facilities. We developed the heat exchanger, parallel type plat fin tube made of Aluminum(Al 6063), which was named Aloo-Heat(No. of The registration design : 0247164, by Korean Intellectual property Office). The fin of exchanger was design of the granulated surface for minimizing fouling factor and dew forms, and also placed parallel to the tube in order to minimized the resistance of flows. 1. Aloo-heat was designed to have 0.03m for inside diameter, 0.036m for outside diameter of tube, 0.0012m for thickness of fin and 0.032m for length of plat fin. 2. t was also designed to have 1.5248m<sup>2</sup>/m for outside area of heat transfer, 0.0942m<sup>2</sup>/m for inside area contacting hot liquid, and the ratio (Ra) was 16.1869. 3. Efficiency of the fin was 93 percentage when fin length was 0.032m, and the fin thickness satisfied equation $\frac{h{\rho}}{k}$< 0.2 when it was 0.0012m. 4. According to the performance test of Aloo-heat, as the temperature and rate increased, the heating value also increased, heating value was 504kJ/h·m and 6,048kJ/h·m when it was 60℃, 10 𝑙/min and 80℃, 40 𝑙/min respectively. 5. The test of heating value was confident, because correlation value(R<sup>2</sup>) was 0.9898 for the temperature and 0.9721 for flow rate of hot liquid, respectively.
지하수 이용을 위한 열교환기 개발. II - 지하수이용 냉·난방기 설계제작 -
이운용,안덕현,김상철,박우풍,강용구,김선배,Lee, W.Y.,Ahn, D.H.,Kim, S.C.,Park, W.P.,Kang, Y.G.,Kim, S.B. 국립한국농수산대학교 교육개발센터 2002 현장농업연구지 = Journal of practical agricultural resear Vol.4 No.1
This study was conducted to develop the heat exchanger by utilizing the heat energy of underground water(15℃), which might be used for cooling and heating system of the agricultural facilities. We developed the heat exchanger by using the parallel type plat fin tube made of Aluminum(Al 6063), which was named Aloo-Heat(No. 0247164, offered by Korean Intellectual property Office). The trial manufactures were made from Aloo-heat which was 600mm, 700mm length respectively, and It were welded to the end "U" type in order to direct flow of the underground water. The performance test was carried out under the condition of open space and room temperature with the change of flow rate of the underground water and air. The results are as follows. 1. The trial manufactures had convection heat value from 33 to 156 W/m<sup>2</sup>℃, and It was coincided with design assumption. 2. The amount of energy transfer was increased with the increment of the area of heat transfer, the air flow, the gap of temperature inlet & outlet the underground water and the air. 3. The heat value was 6,825W when the air flow was 6,000m<sup>3</sup>/h and the gap of temperature between inlet and outlet of the underground water was 6℃, and It dropped from 25.8℃ to 23.2℃(-2.6℃ difference). The convection heat value was 88.5W/m<sup>2</sup>℃. 4. The heat value was 2.625W when the air flow was 4,000m<sup>3</sup>/h and the gap of temperature between inlet and outlet the underground water was 2℃, and It dropped from 27℃ to 22.5℃(-4.5℃ difference). The convection heat value was 33.6W/m<sup>2</sup>℃. 5. Correlation values(R<sup>2</sup>) of the testing heat values of the trial manufacture type I, II, and III were 0.9141, 0.8935, and 0.9323 respectively, and correlation values(R<sup>2</sup>) of the amount of the air flow 6,000m<sup>3</sup>/h, 5,000m<sup>3</sup>/h, 4,000m<sup>3</sup>/h were 0.9513, 0.9414, and 0.9003 respectively.
논문 : 정보처리 및 복합기술 ; 다중 GPS 수신기에 의한 농업용 차량의 정밀 위치 계측(1) -오차추정 시뮬레이션 및 고정위치계측-
김상철 ( S. C. Kim ),조성인 ( S. I. Cho ),이승기 ( S. G. Lee ),이운용 ( W. Y. Lee ),홍영기 ( Y. G. Hong ),김국환 ( G. H. Kim ),조희제 ( H. J. Cho ),강지원 ( G. W. Gang ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.2
This study was conducted to develop a robust navigator which could be in positioning for precision farming through developing a plural GPS receiver with 4 sets of GPS antenna. In order to improve positioning accuracy by integrating GPS signals received simultaneously, the algorithm for processing plural GPS signal effectively was designed. Performance of the algorithm was tested using a simulation program and a fixed point on WGS 84 coordinates. Results of this study are aummarized as followings. 1. 4 sets of lower grade GPS receiver and signals were integrated by kalman filter algorithm and geometric algorithm to increase positioning accuracy of the data. 2. Prototype was composed of 4 sets of GPS receiver and INS components. All Star which manufactured by CMC, gyro compass made by KVH, ground speed sensor and integration S/W based on RTOS(Real Time Operating System)were used. 3. Integration algorithm was simulated by developed program which could generate random position error less then 10 m and tested with the prototype at a fixed position. 4. When navigation data was integrated by geometrical correction and kalman filter algorithm, estimated positioning erros were less then 0.6 m and 1.0 m respectively in simulation and fixed position tests.