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논문 : 생물생산시설 및 환경공학 ; 태양열을 이용한 시설재배 지중변온가온의 토양 온도특성 연구(2) -지중변온가온의 단위면적당 소요에너지-
나규동 ( K. D. Nah ),정석현 ( S. H. Chung ),김태욱 ( T. W. Kim ),김진현 ( J. H. Kim ),김태수 ( T. S. Kim ),김은태 ( E. T. Kim ) 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.1
The temperature of root zone was known as an important factor for the growth of crops and reduction of energy in greenhouse. The purpose of this study was to design the apposite inflow of calories per the unit area by comparison of temperature in the warmed and non-warmed soil. The energy needed for soil warming about pipe length showed the change of temperature on inflow and outflow as 2℃~3℃(average 2.5℃). Therefore, the inflow per the unit hour was 3,450, 57,5 kcal/h·m2 on soil heating respectively. The non-warmed soil temperature in greenhouse made a difference by depth and it was partially affected inner temperature under 15 cm, but it was not above 15 cm. The soil temperature would be raised over 5℃ than non-warmed soil to increase effect of soil warming. Therefore, the inflow per the unit area that should be provided was about 100 kcal/h·m2.
트랙트 견인형 TMR 배합기의 개발(II) -TMR 배합기의 수정 개발 및 성능시험-
박경규,구영모,김혁주,서상훈,장철,나규동,홍동혁,이종순,Park, K. K.,Koo, Y. M.,Kim, H. J.,Seo, S. H.,Jang, C.,Nah, K. D.,Hong, D. H.,Lee, J. S. 한국농업기계학회 2000 바이오시스템공학 Vol.25 No.4
A tractor attached TMR(model 430) mixer has been developed in a previous study. However, the mixer was found to be improved through field applications in its capacity, manufacturing cost, ergonomic design and power-train requirement. The TMR mixer was modified into a model TMR500, approved by Institute of Agricultural Mechanization, as follows : 1. Roughage cutting system was seperated from the mixer, resulting in the 33% reduction of manufacturing cost. 2. Enlarged hopper capacity enabled to feed 60 heads at a batch. 3. Hydraulically controlled gate system saved ergonomic man power. 4. Power transmission system was changed from a chain-sprocket system(27:1) to the gear-train reduction system(38.6:1) to satisfy the recommended use of 540rpm PTO input.
Heat Pump System Using Heated Effluent of Thermal Power Generation Plant as a Heat Source
유영선(Ryou, Y.S.),강연구(Kang, Y.K.),김영화(Kim, Y.H.),장재경(Jang, J.K.),김종구(Kim, J.G.),이형모(Lee, H.M.),강금춘(Kang, G.C.),나규동(Nah, K.D.),허태현(Huh, T.H.) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
In South Korea the gross generation and heated effluent of power generation plant was 259 TWh and 4.73 billion tons in 2008. And then the waste heat from power generation was 388 TWh. It shows that the efficiency of thermal power generation plant is about 40%. Therefore to reduce CO₂ emission from thermal power generation plant, the energy of this heated effluent must be reused to heat buildings or farm facilities. In South Korea horticultural facilities of about 25% are heated in winter season. Total area of greenhouses which are heated is about 13,000 ha. Total heat amount needed to warm greenhouse of 13,000 ha in winter season is only 3.4% of total waste heat from power generation plant. In this study a heat pump system was designed to reuse the waste heat from power generation. Especially new heat exchanger was developed to recover the thermal energy from waste water and this model considered anti-corrosion against sea water and low cost for economic feasibility. This heat recovery system was installed in mango growing greenhouse around thermal power generation plant in Seogwipo-city, Jeju Special Self-Governing Province. The result of preliminary test shows that the heating cost of about 90% is saved as compared to boiler using tax free light oil as a fuel.