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리튬브로마이드(LiBr) 수용액을 활용한 온실 제습을 위한 연구
어승희 ( S. H. Euh ),이정빈 ( J. B. Lee ),우종철 ( J. C. Woo ),강상묵 ( S. M. Kang ),김대현 ( D. H. Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2012 강원 농업생명환경연구 Vol.24 No.2
Due to high temperature and humidity, usually greenhouses are not operated in summer season in Korea. Several methods are being applied to reduce temperature inside of the greenhouses, such as fog cooling and evaporative cooling pad, however those techniques cause increment of humidity as well leading lower crop productivity. In order to overcome this problem, preliminary experiment of dehumidification for the greenhouse was performed using Lithium-bromide(LiBr) solution as the dehumidifying materials. By passing through LiBr-moistened pad, the moisture in the ambient air is absorbed partially into the LiBr solution so that cooled air with suitable humidity for crops can be supplied into the greenhouses. For this test, two different pad types, ``Soundproof pad`` and the ``Loofah pad``, were used. At the test using the two different pad types, the deviation between inlet and outlet relative humidity (RH) was approximately 15% for both pad types. At the test in terms of wind speed change, RH deviation between inlet and outlet were 14.7% in case of 1.79 m/s and 16.1% in 0.89 m/s respectively. From these results, the air flow rate and the pad thickness were the dominant factors for absorbing water into the LiBr solution. The dehumidification system combined with evaporative cooling pad needs to be investigated for further study.
암모니아와 요소용액을 이용한 배출가스내 질소산화물 저감 비교 평가
임영일(Lim Y. I.),이정빈(J. B. Lee),유경선(K. S. Yoo),김상돈(S. D. Kim) 한국태양에너지학회 1995 한국태양에너지학회 학술대회논문집 Vol.- No.-
50 ㎾_(th) 용량의 기체연료버너에서 암모니아 기체와 요소용액을 이용한 선택적 무촉매 환원법 (SNCR;Selective Non-catalytic Reduction) 으로 질소산화물 (NOx) 저감에 관하여 연구하였다. 암모니아는 요소요액보다 더 낮은 반응온도에서 더 높은 효율을 보여주지만 경제성과 암모니아의 부식성 및 맹독성으로 인하여 취급하기에 곤란한 점이 있다. 반면에 요소용액은 적절한 액상첨가제와 기상첨가제를 사용하여 넓은 반응온도 범위에서 높은 효율을 얻을 수 있으며 공정상의 조업비를 절감할 수 있다. 본 실험에서는 액상 첨가제인 CH₃OH와 C₂H_5OH 을 사용하여 50℃ 정도의 최적반응온도 감소를 얻었으며 LPG 와 합성가스 (CH₄:CO:H₂:CO₂-1:4:4:2) 를 기상 첨가제로 사용하여 높은 질소산화물 저감 효율을 관찰하였다.
어승희 ( S. H. Euh ),이정빈 ( J. B. Lee ),최윤성 ( Y. S. Choi ),김대현 ( D. H. Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.3
A photovoltaic/thermal (PVT) solar system is the technology that allows for simultaneous conversion of solar energy into both electricity and heat. PVT system consisted of PV module and thermal absorber plate unified has advantages of improving both the electrical and thermal performances, increasing aesthetic views, and reducing the space and material cost as compared to the separated PV module and solar thermal systems being placed side by side. In this study, the performance analysis of the PVT system was conducted. The maximum power generated was approximately 240W which was similar to the PV module specification, and the highest working fluid (water) temperature in the storage tank was 67℃ which was lower than the solar thermal system specification given due to blocking direct solar radiation to the absorber plate by PV module. The further investigation such as performance analysis compared with the separated PV module and solar thermal systems regarding power, flow rate of working fluid, packing factor needs to be performed.