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문종필,강금춘,권진경,백이,이태석,오성식,남명현,Moon, Jongpil,Kang, Geum-Choon,Kwon, Jin-Kyung,Paek, Yee,Lee, Tae Seok,Oh, Sung-Sik,Nam, Myeong-Hyeon 한국농공학회 2016 한국농공학회논문집 Vol.58 No.5
The effects of spot heating for growing the strawberry cultivated in a plastic greenhouse during the winter that were estimated in Nonsan strawberry experiment station located in Chungnam. The temperature of water for heating was controlled by a electric hot water boiler and kept at the range of $22{\sim}24^{\circ}C$. Heating pipes were set up in root zone for root zone heating and very close to crown for crown heating. Spot heating effects were estimated by applying spot heating system in three test factors of heating root zone, crown only and crown plus root zone. The material for crown heating pipe was white low density polyethylene and the nominal diameter of that pipe was 16 mm. The material for root zone heating pipe was flexible stainless steel and the nominal diameter of that pipe was 15A. The flow rate of heating water circulation was 480 L/h and water circulation lasted for all day long. Temperatures, harvest yield by test beds were surveyed from Nov. 10, 2013 to Apr. 29, 2014. The temperature of crown spot for crown heating bed was at the range of $13.0{\sim}17.0^{\circ}C$ during the night and that of crown spot in control bed was at the range of $8.0{\sim}14.0^{\circ}C$. Also, the temperature of root zone for root zone heating bed was at the range of $18{\sim}21.0^{\circ}C$ and that of root zone in control bed was at the range of $13.0{\sim}15.0^{\circ}C$. The cumulative yield growth rate in earlier harvest period (from Dec. 20 to Mar. 15) of crown heating bed was 43% compared with that of control bed and the cumulative yield of crown plus root zone heating bed was 39 % and that of root zone heating bed was 39 %.
문종필,강금춘,김형권,이태석,오성식,진병옥,Moon, Jong Pil,Kang, Geum Choon,Kim, Hyung Gweon,Lee, Tae Seok,Oh, Sung Sik,Jin, Byung Ok 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6
In this study, a cold well and a warm one with the distance of 100 m were installed in the alluvial aquifer. Groundwater used as the heat and the cold source of heat pump was designed to flow into the warm and the cold well with a diameter of 200 mm. In order to increase the heat and cold storage in aquifer, six auxiliary wells with the diameter of 50 mm and the depth of 30 m were installed at an interval of 5 m from the main well. Also, heat pump 50 RT, the thermal tank $40m^3$, and a remote control and monitoring system were installed in three single-span greenhouses ($2,100m^2$) for growing tomato in Buyeo, Chungcheongnam-do. According to the aquifer heat storage test which had been conducted from Aug. 31 to Sep. 22, 2016, warm water of $850m^3$ was found to flow into warm well. The temperature of the injected water was $30^{\circ}C$ (intake temperature : $15^{\circ}C$), and the heat of 12.8 Gcal was stored. The greenhouse heating test in winter had been conducted from Nov. 21, 2016 to Apr. 30, 2017. On Nov. 21, 2016 when heating greenhouse started, the aquifer temperature of the warm well was $18.5^{\circ}C$. The COP for heating with water source at $18.5^{\circ}C$ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of $15^{\circ}C$ on Jan. 2, 2017 and the heat pump COP was measured to be 3.2 at that time. As a result, the heat pump COP was improved by 18 %. and retrieval heat was 8 Gcal, the retrieval rate of heat stored in aquifer was estimated at 63 %.
문종필,강금춘,권진경,이수장,이종남,Moon, Jong Pil,Kang, Geum Choon,Kwon, Jin Kyung,Lee, Su Jang,Lee, Jong Nam 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
The effects of spot cooling on growing ever-bearing strawberry in hydroponic cultivation during summer by spot cooling system was estimated in plastic greenhouse located in Pyeongchang. The temperature of cooling water was controlled by heat pump and maintained at the range of $15{\sim}20^{\circ}C$. Cooling pipes were installed in root zone and very close to crown. Spot cooling effect was estimated by applying system in three cases which were cooling root zone, crown plus root zone, and crown only. White low density polyethylene pipe in nominal diameter of 16 mm was installed on crown spot, and Stainless steel flexible pipe in nominal diameter of 15A was installed in root zone. Crown and root zone cooling water circulation was continuously performed at flowrates of 300 ~ 600 L/hr all day long. Strawberry yields by test beds were surveyed from Aug. 1 to Sep. 30. The accumulated yield growth rate compared with a control bed of crown cooling bed was 25 % and that of crown plus root zone cooling bed was 25 % and that of root zone cooling bed was 20 %. The temperatures of root spot in root zone cooling was maintained at $18{\sim}23.0^{\circ}C$ and that of crown spot in crown cooling was maintained at $19{\sim}24^{\circ}C$. Also, the temperatures of root spot in crown plus root zone cooling bed was maintained at $17.0{\sim}22.0^{\circ}C$ and that of crown spot was maintained at $19{\sim}25^{\circ}C$.
문종필 ( Jongpil Moon ),강금춘 ( Geum-choon Kang ),권진경 ( Jinkyung Kwon ),김충길 ( Chung-kil Kim ),이수장 ( Sujang Lee ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
여름딸기 고설재배시 고온기에 대한 국소부 냉방효과를 평가하기 위해 강원도 평창 여름딸기 온실에 국소냉난방시스템을 설치하고 적용하였다. 냉수의 온도는 공기대물 히트펌프에 의해 15~20℃.에서 조절되었으며 냉수배관을 근권, 근권과 관부, 관부에 설치하고 세가지 요인으로 시험하였다. 지름이 16mm인 백색연질PE관을 관부에 설치하였으며 근권부에는 같은 크기의 스테인레스 주름관을 설치하였다. 냉수의 순환량은 생장부는 400L/hr 를 순환시켰으며 근권부는 240L/hr 로 8월에 주야간 구분없이 계속 순환시켰다. 효과분석을 위하여 베드별 생산량을 조사하였으며 관부와 근권부를 동시에 냉방한 베드가 대조구에 비해 37% 증가율을 보였고 생장부를 냉방한 베드가 34%, 근권부만을 한 것이 20%의 증가율을 보였다. 근권부 및 관부를 동시에 냉각시킨 베드의 근권부 온도는 17~24℃로 유지되었고 관부의 온도는 18~29℃ 사이에서 유지되었다. The effects of spot cooling on growing strawberry in a nutriculture bed during summer by spot cooling system was estimated at the summer strawberry plastic greenhouse in Pyeongchang Gangwondo. The temperature of cooling water was controllded by air to water heat pump and maintained at the range of 15~20℃. Cooling pipes were installed in root zone and put that very close to crown spot. Spot cooling effect was tested in three cases which were cooling root zone, root zone plus crown spot and crown spot only. White low density polyethylene pipe in external diameter of 16mm was installed on crown spot, and Stainless steel flexible pipe in same size was installed in root zone. Crown zone cooling water circulation was continuously performed at a flowrate of 400 L/hr and Root zone was 240L/hr all day long. Strawberry production per bed was surveyed during August. Production increasing rate of root zone plus crown cooling bed was 37% and crown cooling bed was 34% and Root zone cooling bed was 20%. The temperatures of root zone in root zone plus crown cooling bed was maintained at 17.0 ~ 25.0 ℃ and crown spot was maintanied at 18~29℃ during August 2013.
공기대공기 히트펌프와 경유온풍기의 하이브리드식 최적운영기술 개발
문종필 ( Jongpil Moon ),강금춘 ( Geum-choon Kang ),권진경 ( Jinkyung Kwon ),김충길 ( Chung-kil Kim ),이수장 ( Sujang Lee ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
최근에 공기열 히트펌프는 낮은 설치비와 농용전기의 사용으로 농민들에게 난방비 절감을 가져올 수 있어 그 보급이 확대되고 있다.그러나 공기열 히트펌프를 효과적으로 사용하기 위하여 우선적으로 공기열 히트펌프의 단점을 보완하는 기술개발이 필요하다. 가장 우선적으로 낮은 외기온에 대한 히트펌프의 성능저하를 해결하여야 하며 이를 극복하는 방법으로 기존의 경유난방기와 공기열 히트펌프를 병행하여 운영하는 하이브리드식 운용시험을 실시하였다. 온실의 내부온도 상승여부, 외기온, 실내기의 입출구 온도를 파악하여 공기열 히트펌프의 성능저하가 예측되면 경유온풍기를 가동할 수 있도록 하였으며 외기온이 -8℃ 일 때 경유온풍기만을 사용하였을 때와 비교하였을 때 에너지절감율이 40%를 보였으며 외기온이 0℃ 일때는 80%의 에너지절감율을 보였다.또한 공기열 히트펌프와 경유온풍기의 하이브리드 운영시에는 공기열 히트펌프의 제상시간의 단축되거나 제상기능이 필요하지 않은 것으로 나타났다. Recently, Air source heat pump supply is expanding due to lower installation and cheaper agricultural electricity costs. Hence farmers can easily use that for saving greenhouse heating costs. However it is necessary to develop technology of compensating air source heat pump defect for using that efficiently. Heat pump inefficiency at low outdoor temperature should be solved firstly. As an method of solving above problem, it is necessary to combine air to air heat pump and diesel heater customarily used for heating. In this study, hybrid type operating tests for combining them were performed in three conditions which were determining time for turing on diesel heater accoridng to indoor temperature rising rate, fixed outdoor temperature and temperature difference between inlet and outlet of the indoor heat exchanger. As a result of heating experiments, enegy saving rate was 40% when outdoor temperature was -8℃ and enegy saving rate was 80% when outdoor temperature was 0℃ comparing to using only diesel heater. Also, defrost time of heat pump get shorten or zero when hybrid type operating of combining air to air heat pump and diesel heater was doing.