열회수장치에 의한 열회수성능 분석

서원명,윤용철,강종국 한국생물환경조절학회 2000 생물환경조절학회지 Vol.9 No.4

본 연구는 온실 난방시스템의 연소 체임버에 부착된 연소가스 배출연통에 열회수기를 장착하여 배출가스로부터 열을 회수하는 열회수장치의 성능에 대해 실험·분석하였다. 열회수시스템은 LPG 연소 체임버와 두 개의 열회수기로 구성되어있다. 열회수기-A는 배기가스 연통에 직접 연결되어 있으며 열회수기-B는 열회수기-A에 직렬로 연결되어 있다. 회수되는 열량은 가스의 질량흐름율과 두 측점간의 엔탈피 차이로서 산정하였으며 5가지의 송풍전압별로 각 열회수기의 성능을 검토하였다. 각 열회수기의 공기튜브 다발에 공급된 공기와 튜브 다발에 가로질로 통과하는 연소가스간의 열교환, 열회수기 유·출입부간의 압력감소, 열회수기의 총열회수성능 등으로 온실의 연통을 통해 낭비되는 열을 회수하여 연료 절감 효과를 얻을 수 있는 최적의 열회수장치 설계용 기초자료 확보에 본 연구의 목적이 있다. This study was performed to investigate the performance of heat recovery device attached to exhaust gas flue connected to combustion chamber of greenhouse heating system. The experimental heat recovery system is mainly consisted of LPG combustion chamber and two heat recovery units; unit-A is attached directly to the exhaust gas flue, and unit-B is connected with unit-A. Heat recovery performance was evaluated by estimating total energy amounts by using enthalpy difference between two measurement points together with mass flow rate of gas and/or air passing through each heat recovery unit depending on 5 different flow rates controlled by voltage meter. The results of this experimental study, such as heat exchange behavior of supply air tubes and exhaust air passages crossing the tubes, pressure drop between inlet and outlet, heat recovery performance of exchange unit, etc., will be used as fundamental data for designing optimum heat recovery device to be used for fuel saving purpose by reducing heat loss amounts mostly wasted outside of greenhouse through flue.

큰느타리버섯 재배사의 경제성 분석

서원명,윤용철,Suh, Won-Myung,Yoon, Yong-Cheol 한국농공학회 2006 한국농공학회논문집 Vol.48 No.6

The analysis used in this work was cost-benefit analysis method. All future costs and returns of a given mushroom house were discounted to the time of initial investment (present) by means of 3.5% discount rate. Then the cost of ownership was compared to the return from the system. This analysis method has been developed and coded into a balance sheet for use on a EXCEL program. Using this programmed analysis,a large number of the case studies were examined using different combinations of economic conditions. These results will be very useful to individuals considering investment in a mushroom house, or any similar production system. By the way of the sensitivity analysis for each important parameter, the change of the marginal cost-benefit period could be finally determined. These parameters were typically construction cost of mushroom house, cost of cooling system, required cooling and heating energy amounts, unit price of mushroom media bottle, growing number of media bottles, production weight per unit bottle, sale price of mushroom, and annual number of growing period, etc.

Micro - computer 를 이용한 Greenhouse 의 온도제어 System 개발에 관한 연구

서원명,민영봉,윤용철 ( W . M . Suh,Y . B . Min,Y . C . Yoon ) 한국농업기계학회 1990 바이오시스템공학 Vol.15 No.2

온실내 잉여 태양에너지 산정 (I) - 1-2W형을 중심으로 -

서원명,배용한,유영선,이성현,윤용철,Suh, Won-Myung,Bae, Yong-Han,Ryou, Young-Sun,Lee, Sung-Hyoun,Yoon, Yong-Cheol 한국농공학회 2009 한국농공학회논문집 Vol.51 No.5

This research performed to analyze surplus solar energy, which is generated from a greenhouse during daytime, and to make the basic materials for designing thermal energy storage system for surplus solar energy. For this goal, it analyzed the surplus solar energy coming from two types of greenhouse. The results of this research are as per the below: In the case of 1-2W-type greenhouse, this research gave the same temperature and ventilation condition regardless of regions, but it was judged that the quantity of surplus solar energy could be greatly changed, depending on the energy consumed for the photosynthesis and evapotranspiration of crops in the greenhouse, on the heating temperature during daytime and night, on the existence/non-existence of a curtain and its warming effect, and on the ventilation temperature suitable for the overcoming of high temperature troubles or for the optimum cultivation temperature. In the case of a single-span greenhouse, there was a big difference in energy incoming and outgoing by month, but throughout seasons, 85.0 % of the total energy put into the greenhouse was solar energy and the energy input by heating was just 15.0 % of the total. 26.4 % of the total energy input for the greenhouse was used for photosynthesis and evapotranspiration of crops, and 44.2 % of the remaining 73.6 % went out in the form of radiant heat through the surface of the greenhouse. That is, 25.2 % of the total energy loss was just the surplus solar energy. 67.6 % of the total heating energy was concentrically used for 3 months from December to February next year, but the surplus solar energy during the same period was just 19.4 % of the total annual quantity so it was found that the given condition was more restrictive in directly converting the surplus heat into greenhouse heating. Under the disadvantageous circumstance of 3 months from December to February next year, it was possible to supplement 28 % (December) $\sim$ 85 % (February) of heating energy with surplus solar energy.

큰느타리버섯 재배사의 구조설계용 자료 분석

서원명,윤용철,Suh, Won-Myung,Yoon, Yong-Cheol 한국농공학회 2005 한국농공학회논문집 Vol.47 No.3

This study was carried out to file up structural design data for optimizing Pleurotus eryngii growing houses. Design data are including current farm status of Pleurotus eryngii growing houses in the aspect of structural configuration as well as environmental conditions to be controlled and maintained inside. A structural analysis was performed for the on-farm structures as well as some structures modified and suggested through field survey and analysis. The results are summarized as follows. According to the results of status analysis, Pleurotus eryngii growing houses were categorized as arch-roofed simple type and sandwich panel type. Though the size of Pleurotus eryngii cultivation facilities were considerably diverse, the basic dimensions of Pleurotus eryngii cultivation facilities showed relatively similar pattern: more or less of 20m of length, $6.6\~7.0m$ of width, $4.6\~5.0m$ of peak height, $1.2\~1.6m$ of bed width, and 4 layers of bed. In the aspect of spatial use of cultivation facilities, suggested models were shown to be mostly reasonable in the aspect of heating and cooling, micro-meteorological stability, land use efficiency per unit floor area, etc.. Especially, the standard models suggested so far were thought to be not efficient in its surface area and spatial volume per unit floor area as well as its uneffective structural design in the area around ceiling. In the results of structural analysis for the models suggested through this study by using those section frames to be found on farms, the panel type structures of both single span and double span were estimated to be over designed, whereas arch-roofed pipe houses were mostly found to be under-designed.

열회수장치의 열교환 파이프배치 형식별 열교환 성능

서원명,윤용철,강종국 (사) 한국생물환경조절학회 2002 생물환경조절학회지 Vol.11 No.3

This study was carried out to improve the performance of heat recovery device attached to exhaustgas flue connected to combustion chamber of greenhouse heating system. Three different units wereprepared for the comparison of heat recovery performance; A-type is exactly the same with the typi-cal one fabricated for previous study of analyzing heat recovery performance in greenhouse heatingsystem, other two types (B-type and C-type) modified from the control unit are different in the aspectsof airflow direction (U-turn airflow) and pipe arrangement. The results are summarized as follows;1. In the case of Type-A, when considering the initial cost and current electricity fee required for sys-tem operation, it was expected that one or two years at most would be enough to return the whole costinvested. 2. Type-B and Type-C, basically different with Type-A in the aspect of airflow pattern, arenot sensitive to the change of blower capacity with higher than 25 m3 min-1. Therefore, heat recoveryperformance was not improved so significantly with the increment of blower capacity. This wasassumed to be that air flow resistance in high air capacity reduced the heat exchange rate as well.Never the less, compared with control unit, resultant heat recovery rate of Type-B and Type-C wasimproved by about 5% and 13%, respectively 3. Desirable blower capacity of these heat recoveryunits experimented were expected to be about 25 m3 min-1, and at the proper blower capacity, U-turnairflow units showed better heat recovery performance than control unit. But, without regard to thetype of heat recovery unit, it was recommended that comprehensive consideration of system's physi-cal factors such as pipe arrangement density, unit pipe length and pipe thickness, etc., was requiredfor the optimization of heat recovery system in the aspects of not only energy conservation but eco-nomic system design.

표면코팅 구조재의 달열효과 분석

서원명,윤용철,Suh, Won-Myung,Yoon, Yong-Cheol 한국농공학회 2004 한국농공학회논문집 Vol.46 No.4

This experiment was carried out to study on the effect of surface coating on thermal insulation of farm structures to improve thermal resistance and reflective effect of solar radiation. Nine different types of experimental specimen were compared in the temperature variations of inside and outside; A, B, C, D. E and F types are box container and G, H and I types are drum container. The size of these containers is $1,500{\times}2,000{\times}2,500$ mm and ${\varphi}$ $280{\times}330$ mm, respectively. Specimen of 3-type box(A, B, C) is galvanized steel sheet of thickness 0.45 mm. D, E and F types are sandwich panel of the thickness 50 mm inserted with urethane, glass wool and polystyrene form, respectively. G, H and I types are paint pot using in general. The surface of A. D, E, F and I types didn't any treatment, B, C and G types were treated with thermal insulation coating on the outside surface(B, G) or the inside and outside surface(C). And H type was treated with water paint coating on the only outside surface. In general, the experimental results showed the following tendencies; In case of A, B and C types. it was found that the thermal insulation effect of types coated with thermal insulation coating was improved remarkably than that of no treatment. And the thermal insulation effect between steel sheet and sandwich panel type was nearly similar There was not a significant difference of thermal insulation effect between thermal insulation coating and water paint coating. In time of drum container filled with rough rice, The difference of heat transfer tendency and temperature variation among surface treatments was nearly similar that of box types of galvanized steel sheet. And there was time lag about 6 hours between the temperature of middle part of rice and that of inside or outside surface.

태풍에 의한 파이프 골조 온실의 변형도

서원명,윤용철,Suh, Won-Myung,Yoon, Yong-Cheol 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.4

This research was performed to study the actual behavior of 1-2W type pipe greenhouse under the influence of typhoon by measuring the various strains in structural materials. These results can eventually be utilized in the design criteria as well as in the modification of conventional equation for calculating more realistic wind loads. The first data under the influence of Typhoon Olga arrived in Jinju on Aug. 1999 were obtained by strain gage with 10 sensor points. According to the data obtained, the typical variation of strain depending on wind pattern could be observed. The strains in structural frame were fluctuated very sensitively depending on the direction and magnitude of wind velocity. But some of the data were lost or missed by system's failure. A kind of inherent vibration pattern of greenhouse pipe frame was observed from the plotted data, but this phenomenon is not so clear as to be separated from the overall fluctuation so far. This experimental research is expected to be continued as a long term project to measure and analyze the strain pattern of structural frame depending on the various locations and section characteristics by way of adopting more efficient instrument with sufficient number of measuring points and accuracy.

온실의 냉방관리를 위한 기화냉각 시스템 도입

서원명,민영봉,박중춘 경상대학교 시설원예연구소 1994 施設園藝硏究 Vol.1 No.-

1) 하이미스터의 냉방효과는 외기온도가 높을수록 크게 나타나 하절기 한낮의 높은 온실내부온도 강하를 위한 하이미스터 사용은 아주 효과적일 것으로 예상되나, 온실내부의 습도가 거의 포화상태에 이르러 일반적인 사용을 위해서는 다소의 기술적인 보완이 요구된다. 2) 차광막의 경우 강제환풍기 작동시 실내온도 강하효과는 적으나 실내 습도변화에 거의 영향을 끼치지 안고 또한 강제환풍기 미작동시의 온도강하 효과도 4℃에 이르러 설치 및 유지관리비가 극히 적음을 고려할때 단순한 시설원예등에 사용효과가 높을 것으로 예상된다. 3) 강제환풍기 작동시 차광막과 하이미스터의 복합사용 냉방효과는 각각의 효과를 단순히 합한것과 비슷하나 하이미 ? 냉방효과가 거의 절대적이어서 차광막의 복합사용 효과기대에 크게 미치지 못하고 있다.

氣象異變에 따른 南部地方의 積雪被害와 輕減對策

서원명 韓國施設園藝硏究會 1993 施設園藝硏究 Vol.6 No.2