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Design and Application of Subsurface Drainage Devices for Multipurpose Farmland
Jeon, Jong Gil,Choi, Yong Hun,Kim, Min Young,Kim, Young Gjin Korean Society for Agricultural Machinery 2017 바이오시스템공학 Vol.42 No.4
Purpose: This study aims to identify the most stable boring shape among the circle, square, and inverted-triangle types in order to be applied to the development of a tractor-pulled underdrain boring device. Methods: The underdrain boring devices designed with the circle, inverted triangle, and square types were analyzed by numerical analysis, and they were evaluated by soil moisture and underground water level in the test field. Results: The results of the numerical analysis indicated that the increases in displacement, and strain when a uniform load is placed on the surface soil with soil weight were in the order of the inverted-triangle type, square type, and circle type. The soil moisture content and the underground water level after rainfall showed the largest difference in the order of the circle type, square type, and inverted-triangle type, indicating that the circle type had the largest drainage effects after rainfall. Conclusions: The overall findings of this study show that the circle type is the most stable among the circle, square, and inverted-triangle types.
Design and Application of Subsurface Drainage Devices for Multipurpose Farmland
( Jong Gil Jeon ),( Yong Hun Choi ),( Min Young Kim ),( Young Gjin Kim ) 한국농업기계학회 2017 바이오시스템공학 Vol.42 No.4
Purpose: This study aims to identify the most stable boring shape among the circle, square, and inverted-triangle types in order to be applied to the development of a tractor-pulled underdrain boring device. Methods: The underdrain boring devices designed with the circle, inverted triangle, and square types were analyzed by numerical analysis, and they were evaluated by soil moisture and underground water level in the test field. Results: The results of the numerical analysis indicated that the increases in displacement, and strain when a uniform load is placed on the surface soil with soil weight were in the order of the inverted-triangle type, square type, and circle type. The soil moisture content and the underground water level after rainfall showed the largest difference in the order of the circle type, square type, and inverted-triangle type, indicating that the circle type had the largest drainage effects after rainfall. Conclusions: The overall findings of this study show that the circle type is the most stable among the circle, square, and inverted-triangle types.
전종길 ( Jeon Jong-gil ),이상봉 ( Lee Sang-bong ),이수장 ( Lee Su-jang ),문종필 ( Mun Jong-pil ),김민영 ( Kim Min-young ),김영화 ( Kim Young-hwa ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
This study was carried out to select a suitable improver for underdrain to stably produce crops in a paddy area. Talk, small pumice stone, heated clay, coating chaff and chaff were considered based on unit price, specific gravity and availability. In this study, a total of 19 improvers were selected and compared to choose the best improver for an underdrain. The findings in this study are: 1) a change of soil moisture after rainfall showed that Talk was superior to de-water from soil; and 2) the lowest average ground water level was observed from an underdrain filling up with heated clay, followed by small pumice stone, Talk, coating chaff and chaff. This indicates that the performance of coating chaff was superior and its economic efficiency and drainage effect.
인삼재배 논의 암거 깊이 및 간격별 배수효과 분석 - 토양수분 및 지하수위를 중심으로 -
전종길 ( Jeon Jong-gil ),이상봉 ( Lee Sang-bong ),이수장 ( Lee Su-jang ),문종필 ( Mun Jong-pil ),김민영 ( Kim Min-young ),이성우 ( Lee Seong-woo ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
This study was carried out to examinate the drainage effects of the shallow horizontal typed underdrain which can drain off excess water quickly in rainy wet season for produce ginseng crops stably in the paddy. Measured soil moisture data during 4 hours of rainfall (a total of 36mm rainfall) were 27.9kPa, 82.6kPa, 66.0kPa, and 47.5kPa in the control(untreated) plot and treated plots where underdrains were installed with 3m, 5m, and 7m intervals. Accordingly, soil moisture contents in a treated plot were lower than ones in a control plot. An average value of the ground water level in a control plot was -5.1㎝, while average values of the ground water levels in a treated plot where underdrains were installed with 3m, 5m, and 7m intervals were -51.0㎝, -37.9㎝ and -35.9㎝, respectively. In addition, the ground water level in a treated plot was 36.5㎝ lower than the one in a control plot.
시설원예용 지열 및 태양열 이용 하이브리드 히트펌프 시스템의 난방성능에 관한 연구
전종길(Jeon Jong Gil),이동건(Lee Dong Geon),백이(Paek Yee),김형권(Kim Hyung Gweon) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.5
In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by 23℃. Field performance test results showed that average heating coefficient of performance (COPh) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance (COPh) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.
지중 저수열 이용 코일 침적형 히트펌프 동양난 현장 실증실험 연구
전종길(Jong-Gil Jeon),백이(Lee-Pae),이동건(Dong-Geon Lee),구수근(Soo-Guen Koo) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
We did the verification experiment research for coil deposit type heat pump system using geothermal & water source heat in Protected Horticulture Research Station,RDA. In the result of this research, it showed that energy efficiency and heating cost reduction effect was outstanding (Experiment result : average heating COP 4.3, heating cost 87% reduction compared to hot air heater). Therefore this paper is going to do field verification experiment research to check on whether the energy efficiency and the heating cost reduction effect are excellent or not in the feild after installing the coil deposit heat pump system in the floriculture farmhouse that is cultivating oriental orchids based on the result of verification experiment in RDA.
전종길 ( Jeon Jong-gil ),이상봉 ( Lee Sang-bong ),윤진하 ( Yun Jin-ha ),김진택 ( Kim Jin-taek ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
This study was carried out to design, construct, and test the automatic inlet for the environment and status of control devices in the field. The sensing-type automatic inlet was developed for purpose of reducing farmer's working hours required for water management and saving irrigation water. The sensing-type automatic inlet was composed of four parts : sensor being made a signal by ponding depth, inlet body including frame, gate and screw shaft, control box including power switch, controller , relay, and drving devices including motor, battery, etc. It was designed to open and close the control gate according to the signal of the sensor. The working performance of the developed inlet in the field was successfully carried out and something to do the supplementation were derived.
전종길 ( Jeon Jong-gil ),이상봉 ( Yi Sang-bong ),이수장 ( Yi Su-jang ),김진영 ( Kim Jin-young ),신재순 ( Shin Jae-sun ),서성 ( Seo Seong ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
This study was carried out to examinate drainage effect of the shallow horizontal culvert which can drain off excess water quickly in rainy wet season for produce forage crops stably in the paddy. The results of this study are as follows. In the measured data of soil moisture change for 38 hours after 37㎜ rainfall, the value of soil moisture tension in untreated control plot was 21.1kPa, while values of soil moisture tension for 3m, 5m, 7m culvert interval in treated control plot were 25.9kPa, 23.1kPa, 22.4kPa, respectively. Accordingly, soil moisture of treated control plot was shown more dried soil than that of untreated control plot. also, an average value of ground water level in untreated control plot was -4.3㎝, while average values of ground water level for 3m, 5m, 7m culvert interval in treated control plot was -31.1㎝, -27.8㎝ and -21.7㎝, respectively. It shows to go down 22.6㎝ comparing an average value of ground water level in treated control plot with that of ground water level in untreated control plot.