지역농업 활성화를 위한 노지 스마트농업 모델 연구

최인찬 ( Inchan Choi ),강상현 ( Sanghyeon Kang ),이상봉 ( Sangbong Lee ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2

최근 농업인구의 감소와 고령화를 해결하기 위해 4차산업혁명 기술을 적용한 스마트팜이 활성화 되고 있다. 국내 스마트팜은 온도, 습도와 기상상황을 모니터링하고, 창문개폐, 양액공급, 냉·난방 등을 원격으로 제어ㆍ관리하는 기술을 포함한 온실과 축사에 집중되고 있다. 그러나 농산물의 대량생산이 이루어지는 노지 농업에서의 스마트팜 확산속도는 빠르지 않으며, 현장에 시스템을 구축하는데 한계를 보이고 있다. 본 연구에서는 농작업 편의성을 향상시키는 스마트 농작업기, 센서를 통한 환경 모니터링 시스템, 물 공급·관리를 위한 관수 시스템으로 스마트 노지 통합 모니터링 시스템을 구축하였다. 먼저 노지 스마트농업 대상지는 고령화와 지역 소멸화가 높은 경북 의성군을 선정하고 농업환경, 주요 작목 문제점 파악 등 농업기술 및 경영, 스마트농업 인프라 구축현황을 분석하였다. 그리고 지역 단위 스마트농업 모델의 성공적 정착을 위해 대상 지역 농업 현장에 적합한 영농기술을 제시하였다. 의성군 주요 작목은 벼, 마늘, 사과이며, 총소득액의 66% 차지하고 있다. 이 작목을 중심으로 인터넷을 활용한 노지 스마트농업 지원 시스템을 구축하였다. 벼에는 물 공급·관리를 위한 자동물꼬와 재배환경 모니터링 시스템, 마늘은 봄 가뭄을 해결하기 위한 원격관수시스템, 사과는 폭염 및 서리를 위한 차광망, 관수를 위한 원격제어시스템과 환경 모니터링 시스템으로 구성된 통합관리시스템을 구축하였다. 본 시스템은 인터넷 기반으로 스마트 기기를 이용하여 원격제어와 모니터링이 가능하다. 이전의 자동 물꼬 연구(2007)에서 기존물꼬 대비 86.2% 관리노력이 절감되었고, 시설원예 스마트팜(2016)에서는 영농 편의성이 23.9% 증가한 것으로 분석되었다. 지역단위 노지 스마트농업 지원 모델에 대한 노동력 감소, 편의성, 경제성 등에 대한 정확한 조사가 필요하다. 본 연구는 지역에 적합한 스마트농업 기술을 통해 농작물 피해 최소화와 안정적인 농업 생산 기반을 마련하고 노지 관개시설로 물 절약을 통한 탄소중립에도 도움을 줄 것으로 사료된다.

PLIF를 이용한 이중 선회 가스터빈 연소기의 과도 및 불안정 모드 연구

최인찬(Inchan Choi),이기만(Keeman Lee),A.R. Masri 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12

This paper described experimental investigations of the transition and instability mode in a lean premixed dual swirl combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead to a structural damage to the combustion chamber. Heat release analysis in instability and transition mode has been examined with OH and CH-PLIF system. flame tomography with operated at 10kHz. Experiment results suggest that unstable flame behavior has a specific frequency with 200Hz and this frequency is accords with 1/2 subhamonic of resonance frequency, not fundamental frequency. Also, it is confirmed that the combustion instability is strongly related to the CIVB phenomenon.

전기 자동차용 이산화탄소 열펌프 시스템의 냉난방 능력평가

최인찬(Inchan Choi),송준호(Junho Song),김영일(Youngil Kim),최종민(Jongmin Choi),이기만(Keeman Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

Heat pump system using CO₂ refrigerant was designed to develop a new air-conditioning system of an electric vehicle because there is no any other heating source like a IC engine for electric vehicles or fuel cell vehicles. In this paper, the indoor heat exchanger(evaporator for a cooling mode and gas cooler for a heating mode) of the heat pump system was analyzed. The heating capacity was compared with the cooling capacity for various operating conditions such as different compressor speed, outdoor inlet fontal air velocities, air flow rates and temperatures passing through an indoor heat exchanger using the precision CO₂ calorimeter. The experimental results can be used to evaluate the effect of system design changes on system performance as well as the development of a highly efficient heat pump system.

전기 자동차용 이산화탄소 열펌프 시스템의 열교환기 성능평가

최인찬(Inchan Choi),김영일(Youngil Kim),최종민(Jongmin Choi),이기만(Keeman Lee) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2

Heat pump system using CO2 refrigerant was designed to develop a new air-conditioning system of an electric vehicle because there is no any other heating source like a IC engine for electric vehicles or fuel cell vehicles. In this paper, the heat exchanger of the heat pump system was analyzed. The heat exchanger performance was evaluated to various operating conditions such as different compressor speed, outdoor inlet frontal air velocities, air flow rates and temperatures passing through an heat exchanger using the precision CO2 calorimeter. The experimental results can be used to evaluate the effect of system design changes on system performance as well as the development of a highly efficient heat pump system.

모사 SNG 연료를 적용한 모델 가스터빈 연소기의 연소 불안정성에 관한 실험적 연구

최인찬(Inchan Choi),이기만(Keeman Lee) 한국연소학회 2015 한국연소학회지 Vol.20 No.1

The combustion instability was experimentally investigated in model gas turbine combustor with dual swirl burner. When such instability occurs, a strong coupling between pressure oscillation and unsteady heat release excites a self-sustained acoustic wave which results in a loud sound, and can even cause fatal damage to the combustor and entire system. In present study, to understand the combustion instability with a premixed mixture, the detailed periods of pressure and heat release data in unstable flame mode were investigated by various measurement methods at relatively rich condition and lean condition near flammable limits. Also, to prepare the utilization of synthetic natural gas (SNG) fuel in gas turbine system, an investigation was conducted using a simulated SNG including methane as a reference fuel to examine the effects of H₂content on flame stability. These results provide that the instability due to flash-back behaviour like CIVB phenomenon occurred at rich condition, while the repetition of relighting and extinction caused the oscillation of lean condition near flammable limit. From the analysis of H₂content effects, it is also confirmed that the instability frequency is proportional to the laminar burning velocity at both rich and lean condition.

자발광 계측을 통한 모사 SNG 수소함량에 따른 이중선회 버너의 화염 안정화 특성

최인찬(Inchan Choi),오광철(Kwangchul. Oh),이기만(Keeman Lee) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11

이중선회 연소기의 SNG 연료 적용을 위한 수소 첨가에 따른 화염 안정 특성

최인찬(Inchan Choi),윤승호(Seungho Yoon),이기만(Keeman Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

This article describes an investigation of combustion characteristics with various compositions of synthetic natural gas (SNG) in dual swirl combustor. The objective of this study is to investigate the flame stabilization, flame structure, fuel compatibility in SNG flame with varying fuel compositions. As experimental conditions, hydrogen content was adjusted from 0 to 11%. Moreover, addition of hydrogen enables keeping stable combustion condition when, for the same methane flow, the flame becomes lifted and very unstable. Experimental results show that the addition of hydrogen has a major effect on flame behavior due to the higher burning rates associated with hydrogen consequently, The higher reaction activity of hydrogen has increased the unstable or flashback region. However, stable flame region was shifted to the lean condition.

합성천연가스(SNG) 조성비 변화에 따른 이중선회 연소기의 기초 연소특성

최인찬(Inchan Choi),이기만(Keeman Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4-3

PLIF 및 자발광 계측을 이용한 이중선회 가스터빈 연소기에서 연소불안정 모드 연구

최인찬(Inchan Choi),이기만(Keeman Lee),Mrinal Juddoo,A.R. Masri 한국연소학회 2014 한국연소학회지 Vol.19 No.1

This paper described an experimental investigations of combustion instability mode in a lean premixed dual swirl combustor for micro-gasturbine system. When such the instability occurs, a strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead a structural damage to the combustion chamber. The detailed period of flame behavior and heat release in combustion instability mode have been examined with high speed OH and CH-PLIF system and CH<SUP>*</SUP> chemiluminescence measurement, flame tomography with operated at 10 ㎑ and 6 ㎑ each. Experiment results suggest that unstable flame behavior has a specific frequency with 200 ㎐ and this frequency is accords with about 1/2 sub-harmonic of combustor resonance frequency, not fundamental frequency. This is very interesting phenomenon that have not reported yet from other previous works. Therefore, when a thermo-acoustic instability with Rayleigh criterion occurs, the fact that the period of heat release and flame behavior are different each other was proposed for the first time through this work.

이중 선회버너에서 연소실 직경에 따른 온도장 특성에 관한 실험적 연구

최인찬(Inchan Choi),이기만(Keeman Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46