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자료유형
학술저널
저자정보
이용범 (National Institute of Agricultural Engineering) 조성인 (Seoul National University) 강창호 (Bio-Production Fundamental Engineering Division) 정인규 (National Institute of Agricultural Engineering, RDA) 이충근 (National Institute of Agricultural Engineering, RDA) 성제훈 (National Institute of Agricultural Engineering, RDA) 정선옥 (National Institute of Agricultural Engineering, RDA) 김영복 (GyeongSang National University)
저널정보
한국농업기계학회 바이오시스템공학(구 한국농업기계학회지) 바이오시스템공학 제30권 제3호
발행연도
2005.1
수록면
185 - 191 (7page)

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Importance of alternative energy has been increasing due to environmental issues and lack of fossil fuels. In addition, heating cost that occupies from 30 to $40\%$ of the total production cost in the protected cultivation sector in Korea needs to be reduced for profitability and global competition. But, study on geothermal energy to solve these problems has not been activated for Korean protected cultivation. This study was conducted to develop an optimized geothermal exchange system through fundamental test of heat transfer characteristics in soil such as thermal diffusivity, changes in soil temperature during heating and cooling operations, and restorations of soil temperature after the heater was fumed off, These issues were investigated using computer simulation for different depths. The simulated characteristics were evaluated through controlled tests. Simulated characteristics of heat transfer in the soil at different depths showed a reasonable agreement with the results of the controlled tests. All of computer simulation and controlled tests, soil temperatures changed at 10cm and 20cm distance from pipe. but don't change at more than 30cm distance. It means that distances of heat transfer of the soil ranged from 20 to 30cm a day. Based on these results, the optimum spacing between adjacent heat exchange pipes and the pitch were selected as 50 and 40cm, respectively.

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