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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.