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논문 : 생물생산시설 및 환경공학 ; 식물공장내 작물의 간격조절방법에 대한 식재면적지표 시뮬레이션
김준용 ( Joon Yong Kim ),양승환 ( Seung Hwan Yang ),이춘구 ( Chun Gu Lee ),( Alireza A. Ashtiani ),이중용 ( Joong Yong Rhee ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.5
Various crop spacing methods have been implemented so far for the greenhouse and plant factory applications. However, there is no generally accepted parameter for evaluation of plant spacing efficiency in plant production system. In this study, ``Planted Area Index`` (PAI) of a spacing method is defined as the ratio of the planted area in the field to required planted area using the spacing method when no transplanting operation is assumed. Three common types of spacing methods for plane placement of the plants were modeled mathematically. For calculating the planted area, an optimal growth radius function (R(t)) is needed. Function of the days after transplanting stage gives a radius of an optimal circle area for the living plants. A computer simulation was developed to calculate the PAI, based on three crop spacing methods and four optimal growth radius functions. In general, the 1-D zigzag spacing showed the best PAI. Moreover, it gives an example on how to apply the PAI for the design.
김훈(Hoon Kim),이중용(Joong Yong Yi),장한별(Han Byeol Jang),이동희(Dong Hee Lee),이호철(Ho Cheol Lee),한상철(Sang Cheol Han) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
In this study, in order to analyze the status of user side heating usage in district heating apartments, a temperature sensor was installed in the sample households where the actual residents live, to monitor the supply and return temperatures of heating water and room temperature. In addition, the target apartment complex was divided into three groups, and the difference in heating effect was analyzed on the condition that the set value of household heating water flow rate and the flushing of household floor heating coil was performed or not. As a result of the analysis of the household heating usage pattern, it was found that most of the users are using the on/off method like an individual heating boiler, rather than keeping the set temperature of the indoor temperature controller constant. As a result of analyzing the effect of flushing work, it was confirmed that compared to the group that implements the flushing work, the group that did not implement the flushing work reduced the heating effect by relatively decreasing the hot water flow rate due to clogging by solids inside the floor heating coil. As a result of reviewing the flow rate of hot water and the amount of heat used, when the heating rate is charged to the household based on the hot water flow rate, the amount of heat used for actual heating may not be properly reflected in the rate, and thus there may be a discrepancy between the energy used and the heat charge.
이춘구 ( Chun Gu Lee ),김준용 ( Joonyong Kim ),박동혁 ( Donghyeok Park ),박하나 ( Ha-na Park ),이중용 ( Joong Yong Rhee ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
최근 전 세계적으로 무인항공기(Unmanned Aerial Vehicle, UAV) 시장이 점차 커지면서 농업 분야에서도 UAV를 다양한 방식으로 활용하고자 하는 시도가 점차 늘고 있다. 특히 분무 시스템을 활용한 무인 항공 방제 시스템(Unmanned Aerial Spraying System, UASS)은 방제작업을 자동화하고 정밀성과 작업자 안전성을 높였으며, 하향 풍을 이용하여 방제 효과가 높은 것으로 알려져 한국, 중국, 일본 등지에서 그 사용이 점차 늘어나는 추세다. 이에 본 논문에서는 UASS의 성능을 평가하는 표준을 만들기 위하여 한국, 중국, 일본 3개국에서 개발한 UASS의 표준을 분석하고 각 표준에서 제안하는 방법으로 방제 성능을 측정하여 그 성능을 비교하였다. 방제성능을 비교하기 위하여 작물 보호제 대신 BSF(Brilliant Sulfaflavine)을 이용하여 방제실험을 진행하였고, 감수지(water sensitive card)와 형광 분석을 통하여 분무된 양의 분포를 측정하였다. 실험 결과를 통하여 각 평가 표준의 단점을 보완하여 UASS 성능 평가를 위한 국제 표준을 개발하는데 활용할 수 있을 것으로 보인다.
김훈(Hoon Kim),이중용(Joong Yong Yi),이찬(Chan Lee),이재승(Jae Seung Lee) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, the De-NOx system of the CHP plant is a hybrid type in which SCR and SNCR are installed together, and the Urea is injected into the flue gas through a hot cyclone type vaporizer to convert it into NH₃ and supply it to the SCR. During operation, the Urea sprayed on the hot cyclone did not sufficiently vaporize, and isocyanate solids, which are intermediates of NH3 conversion, were generated and deposited, which resulted in the deterioration of the facility safety. In order to analyze the cause of this phenomenon, CFD modeling using ANSYS FLUENT was performed. As a result, Urea’s NH3 conversion was found to be the flue gas temperature, and the urea conversion rate was low at the flue gas temperature below 300℃. When the flue gas temperature was below 300℃, it was observed that the boiler was at the intial start-up time. As a improvement plan, Urea gasification facility was installed and flue gas heating system was installed in front of hot cyclone. As a result of review the direct fired heating system and the electric heating system with the flue gas heating system, it was considered that the electric heating system was appropriate. As a result of design of the electric heating device, it is considered that 790kW electric heating device is required in this case and the operation cost of 6.7 million won per year including the electric power cost would be required.