음향방출을 이용한 열교환기 누설검사에 관한 연구

남상운,장원규,황보준도 제어로봇시스템학회 1999 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.10

이중필름 수막시스템의 에너지 절감 효과

남상운,허연정,심옥자,심상일,이호상 안성산업대학교 1998 論文集 Vol.30 No.-

This study was carried out to investigate energy saving effect and thermal insulation characteristics of double film water curtain system during the coldest season in greenhouse. A double film water curtain system is a ground water spraying system between double layered plastic film, and it is able to make uniform water curtain. The experimental greenhouses were plastic greenhouses of two types. A type-Ⅰ was a two-thirds arched shape and its area was 350㎡ . A type-Ⅱ was a triangle shape and its area was 190㎡. Both greenhouses were cultivated with cactus. The minimum outside air temperature ranged was -2.6 to -16.7℃ and nocturnal ambient mean temperature was -6.5℃. The experimental greenhouses have maintained the air temperature above 2℃ of type-Ⅰ and 8℃ of type-Ⅱ. The ground water spraying flow rates of these greenhouses were 7.0ℓ/㎡hr of type-Ⅰ and 4.3ℓ/㎡hr of type-Ⅱ. The overall heat transfer coefficient of type-Ⅰ greenhouse was calculated at 1.97 kcal//㎡hr℃ and type-Ⅱ was 1.44 kcal/㎡hr℃. The energy saving rate of type-Ⅰ greenhouse was estimated and 78.1% and type-Ⅱ was 98.9%.

금강변 저지대 시설원예단지의 침수피해 실태와 개선방안 조사연구

남상운,김태철,김대식,Nam, Sang-Woon,Kim, Tae-Cheol,Kim, Dae-Sik 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3

Investigations on the inundation damage and improvement measures were carried out centering around the protected horticultural complex concentrated in lowlands on the side of Geum river, in Nonsan and Buyeo, Chungnam. Most greenhouses were single-span plastic houses in this area, and tomato, strawberry and watermelon were cultivated mainly. 45.8 % of whole farmhouse were experienced in damage by inundation, and a frequency of the damage was average once in 11 years. The most urgent problem at the greenhouse culture in this area was showed in order of drainage improvement, irrigation water resources and energy saving. Consideration items in drainage improvement project for protected horticulture were showed in order of extending drain pumps, extending drain canals, using concrete flume in drain ditch. It needs to consider systematic plans that can restrain new establishment of greenhouses on the lowland paddy field in drainage area. It is difficult to remove greenhouses which are already established or prohibit cultivation. Therefore we should impose minimum duty items so that greenhouse tillers can cope with inundation. And it is thought that managing agency need to minimize farmers damage by improving drainage ability and introducing maintenance pattern that is different from rice cropping.

차량통신용 J1850 프로토콜의 시뮬레이션 및 성능평가

남상운,윤정아,이석 제어로봇시스템학회 1996 제어로봇시스템학회 국내학술대회 논문집 Vol.2 No.10

온실의 기간난방부하 산정을 위한 난방적산온도 비교분석

남상운,신현호,서동욱 (사) 한국생물환경조절학회 2014 생물환경조절학회지 Vol.23 No.3

To establish the design criteria for seasonal heating load calculation in greenhouses, standard weather dataare required. However, they are being provided only at seven regions in Korea. So, instead of using standard weatherdata, in order to find the method to build design weather data for seasonal heating load calculation, heating degreehourand heating degree-day were analyzed and compared by methods of fundamental equation, Mihara’s equationand modified Mihara’s equation using normal and thirty years from 1981 to 2010 hourly weather data provided byKMA and standard weather data provided by KSES. Average heating degree-hours calculated by fundamental equationusing thirty years hourly weather data showed a good agreement with them using standard weather data. The 24times of heating degree-day showed relatively big differences with heating degree-hour at the low setting temperature. Therefore, the heating degree-hour was considered more appropriate method to estimate the seasonal heatingload. And to conclude, in regions which are not available standard weather data, we suggest that design weather datashould be analyzed using thirty years hourly weather data. Average of heating degree-hours derived from every yearhourly weather data during the whole period can be established as environmental design standards, and also minimumand maximum of them can be used as reference data for energy estimation. 우리나라 각 지역별 온실의 기간난방부하 산정용 난방적산온도 자료를 구축하기 위해서는 표준기상데이터가필요하다. 그러나 국내에는 서울과 6대 광역시 등 7개지역만 표준기상데이터가 제공되고 있어서 이를 대체할수 있는 방법을 찾아야 한다. 전국적으로 이용이 가능한기상자료는 기상청의 일별 평년값 자료 및 30년(1981~2010)간 매 시각 전체 기상자료이므로 이를 이용하여 난방디그리아워와 난방디그리데이를 구하였다. 표준기상데이터가 있는 7개 지역을 대상으로 평년값 자료및 전체 기상자료를 사용하여 구한 난방디그리데이와 난방디그리아워를 표준기상데이터를 사용하여 구한 결과와비교하였다. 전체 기상자료를 이용하여 기본식으로 구한난방디그리아워의 평균값이 표준기상데이터로 구한 것과잘 일치하는 것으로 나타났다. 또한 평년값을 이용하여수정 Mihara식으로 구한 난방디그리아워도 표준기상데이터로 구한 것과 거의 비슷한 경향을 보였다. 이에 비하여 평년값을 이용하여 Mihara식으로 구한 난방디그리아워는 표준기상데이터로 구한 것 보다 훨씬 작았고 전체 기상자료의 최소값에 가까운 것으로 나타났다. 난방디그리아워와 동일한 단위로 환산했을 때, 난방 설정온도가 높을 경우에는 난방디그리데이와 난방디그리아워의차이가 별로 없었으나, 설정온도가 낮을 경우에는 난방디그리데이 방식이 난방디그리아워 방식보다 지역에 따라3~26%나 작게 나타나는 것으로 분석되었다. 난방디그리데이는 평년값을 이용하여 기본식으로 구할 수 있기 때문에간편한 방법이지만 설정온도가 낮을 경우 오차가 크게 발생되므로 난방디그리아워 방식이 더 합리적인 방법으로판단된다. 결론적으로 온실의 환경설계용 기상자료 구축에서 난방적산온도는 평년값과 동일한 30년간의 시간별 기상자료를 이용하여 매년 난방디그리아워를 구하고 전체자료기간의 평균값을 설계 자료로 활용할 것을 제안한다. 또한 최대 및 최소 난방디그리아워 자료를 제공함으로써기상상황에 따른 에너지 소비량 예측 및 경제성 평가에활용할 수 있도록 할 필요가 있을 것으로 판단된다.

간척지 설치 온실의 난방부하 특성 분석

남상운,신현호,Nam, Sang Woon,Shin, Hyun Ho 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6

The purpose of this study was to provide basic data for development of environmental design technology for greenhouses constructed in reclaimed lands. We analyzed the climatic conditions around seven major reclaimed land areas in Korea, which have a plan to install advanced horticultural complexes. The characteristics of heating load through the thermal environment measurement of the greenhouse in Saemangeum were analyzed. The part to be applied to the environmental design of the greenhouses in reclaimed lands were reviewed. The overall heat transfer coefficient of the experimental greenhouse with the aluminum screen and multi-layer thermal curtain averaged $3.79W/m^2^{\circ}C$. It represents a 44 % heat savings rate compared with plastic greenhouses with a single covering, which was significantly lower than that of the common greenhouses with 2-layer thermal curtains. This is because the experimental greenhouse was installed on reclaimed land and wind was stronger than the inland area. Among the total heating load, the transmission heat loss accounted for 96.4~99.9 %, and the infiltration loss and the ground heat exchange were low. Therefore, it is necessary to take countermeasures to minimize the transmission heat loss for greenhouses constructed in reclaimed lands. As the reclaimed land is located on the seaside, the wind is stronger than the inland area, and the fog is frequent. Especially, Saemangeum area has 2.6 times stronger wind speed and 3.4 times longer fog duration than the inland area. In designing the heating systems for greenhouses in reclaimed lands, it is considered that the maximum heating load should be calculated by applying the wind coefficient larger than the inland area. It is reasonable to estimate the operation cost of the heating system by applying the adjustment factor 10 % larger than the average in calculating the seasonal heating load.

포그분사 및 공기유동에 의한 온실재배 토마토의 엽온 변화

남상운,김영식,서동욱 (사) 한국생물환경조절학회 2014 생물환경조절학회지 Vol.23 No.1

To investigate the influence of surrounding environment on the plant temperature and examine the effectof plant temperature control by fogging and airflow, plant temperature of tomato, inside and outside air temperatureand relative humidity, solar radiation and wind speed were measured and analyzed under various experimental conditionsin plastic greenhouse with two-fluid fogging systems and air circulation fans. According to the analysis of planttemperature and the change of inside and outside air temperature in each condition, inside air temperature and planttemperature were significantly higher than outside air temperature in the control and shading condition. However, inthe fogging condition, inside air temperature was lower or slightly higher than outside air temperature. It showed thatplant temperature could be kept with the temperature similar to or lower than inside air temperature in fogging andairflow condition. To derive the relationship between surrounding environmental factor and plant temperature, we didmultiple regression analysis. The optimum regression equation for the temperature difference between plant and airincluded solar radiation, wind speed and vapor pressure deficit and RMS error was 0.8oC. To investigate whether thefogging and airflow contribute to reduce high temperature stress of plant, photosynthetic rate of tomato leaf wasmeasured under the experimental conditions. Photosynthetic rate was the highest when using both fogging and airflow,and then fogging, airflow and lastly the control. So, we could assume that fogging and airflow can make bettereffect of plant temperature control to reduce high temperature stress of plant which can increase photosynthetic rate. It showed that the temperature difference between plant and air was highly affected by surrounding environment. Also, we could estimate plant temperature by measuring the surrounding environment, and use it for environmentcontrol to reduce the high temperature stress of plant. In addition, by using fogging and airflow, we can decreasetemperature difference between plant and air, increase photosynthetic rate, and make proper environment for plants. We could conclude that both fogging and airflow are effective to reduce the high temperature stress of plant. 주변 환경이 작물의 엽온에 미치는 영향을 규명하고,포그분사 및 공기유동에 의한 엽온조절의 효과를 검토하기 위하여 이류체 포그시스템 및 공기유동 장치를 설치한 토마토 재배온실에서 다양한 실험조건하에 작물의 엽온과 실내외 온습도, 일사량, 풍속 등의 환경을 계측하여 분석하였다. 처리조건별 엽온 및 실내외 기온의 변화를 분석한 결과, 무처리와 차광조건에서는 실내기온과엽온 모두 외기온보다 상당히 높았으나, 포그분사 조건에서는 실내온도가 외기온보다 낮거나 약간 높은 정도를유지하는 것으로 나타났고, 포그분사와 공기유동 조건에서는 엽온을 실내온도와 비슷하거나 더 낮게 유지할 수있는 것으로 나타났다. 일사량, 풍속 및 포차에 따른 엽기온차의 변화를 분석하였으며, 주변 환경요인과 엽온과의 관계를 도출하기 위하여 다중회귀분석을 실시하였다. 엽기온차에 대한 최적의 회귀방정식은 일사량, 풍속, 포차를 모두 고려한 것으로써 RMS 오차는 0.8oC였다. 본회귀방적식을 이용하여 온실의 온습도, 일사량, 풍속을측정하면 엽온을 추정할 수 있으며, 토마토 재배온실의고온기 작물 스트레스 경감을 위한 환경조절에 활용할수 있을 것으로 판단된다. 처리조건별 광합성 속도는 포그분사와 공기유동의 병행 처리에서 가장 컸고, 포그분사, 공기유동, 무처리 순으로 나타났다. 포그분사에 공기유동까지 병행하면 체온조절 효과가 증대하여 작물의 고온 스트레스를 경감할 수 있으며 결국 광합성을 증대시킬 수 있는 것으로 판단된다. 이상을 종합해보면 엽온과기온의 차이는 주변 환경에 큰 영향을 받는 것으로 나타났으며, 주변 환경을 계측함으로써 엽온을 추정할 수있고, 그것을 고온 스트레스 경감을 위한 환경조절에 활용할 수 있을 것으로 판단된다. 또한, 포그분사 및 공기유동을 통해 엽기온차를 줄이고 광합성 속도를 증가시켜작물생장에 유리한 환경을 조성할 수 있으며, 고온 스트레스를 경감시키는데 효과적일 것으로 판단된다.

친환경 농촌마을계획을 위한 신재생에너지 활용방안 연구 -태양에너지 자원분석-

남상운,김대식 한국농공학회 2008 한국농공학회논문집 Vol.50 No.3

Solar energy, which is one of renewable energy, would be the most useful resources that can be applied to making energy recycling villages without using fossil energy. This study analyzed energy potential on solar energy considering weather condition in three traditional villages and compared with energy consumption surveyed. A photovoltaic system having 3.0kWp capacity of unit module can generate 182.5%, 96.1% and 170.9% of the yearly mean consumption of electric power in Makhyun, Boojang, and Soso, respectively. A flat-plate solar collector having 2.64m² area of unit module can generate warm water of 142ℓ/day, 89ℓ/day, and 173ℓ/day, respectively in three study villages. In Makhyun and Soso, photovoltaic power and warm water produced by solar energy were sufficient to supply required amount of electric power and warm water. However, both electric power and warm water produced by unit solar module were not sufficient in Boojang area, and so it is required to increase the module area by more than 50%. According to the results of this study, the appropriate combination of energy resources can be applied to rural green-village planning if the characteristic of energy potential for each local area is considered. Solar energy, which is one of renewable energy, would be the most useful resources that can be applied to making energy recycling villages without using fossil energy. This study analyzed energy potential on solar energy considering weather condition in three traditional villages and compared with energy consumption surveyed. A photovoltaic system having 3.0kWp capacity of unit module can generate 182.5%, 96.1% and 170.9% of the yearly mean consumption of electric power in Makhyun, Boojang, and Soso, respectively. A flat-plate solar collector having 2.64m² area of unit module can generate warm water of 142ℓ/day, 89ℓ/day, and 173ℓ/day, respectively in three study villages. In Makhyun and Soso, photovoltaic power and warm water produced by solar energy were sufficient to supply required amount of electric power and warm water. However, both electric power and warm water produced by unit solar module were not sufficient in Boojang area, and so it is required to increase the module area by more than 50%. According to the results of this study, the appropriate combination of energy resources can be applied to rural green-village planning if the characteristic of energy potential for each local area is considered.

온실내 근권부의 지중냉각부하 추정

남상운 (사) 한국생물환경조절학회 2002 시설원예‧식물공장 Vol.11 No.4

Root zone cooling, such as soil or nutrient solution cooling, is less expensive than air cooling in thewhole greenhouse and is effective in promoting root activity, improving water absorption rate,decreasing plant temperature, and reducing high temperature stress. The heat transfer of a soil cool-ing system in a plastic greenhouse was analyzed to estimate cooling loads. The thermal conductivity ofsoil, calculated by measured heat fluxes in the soil, showed the positive correlation with the soil watercontent. It ranged from 0.83 to 0.96 Wm-1 oC-1 at 19 to 36% of soil water contents. As the indoorsolar radiation increased, the temperature difference between soil surface and indoor air linearlyincreased. At 300 to 800 W m-2 of indoor solar radiations, the soil surface temperature rose from 3.5to 7.0oC in bare ground and 1.0 to 2.5oC under the canopy. Cooling loads in the root zone soil wereestimated with solar radiation, soil water content, and temperature difference between air and soil. At300 to 60 W m-2 of indoor solar radiations and 20 to 40% of soil water contents, 46 to 59 W m-2 ofsoil cooling loads are required to maintain the temperature difference of 10oC between indoor air androot zone soil.

아치형 온실의 자연환기 및 차광방법 개선 연구

남상운 안성산업대학교 1995 論文集 Vol.27 No.-

Arched pipe greenhouse using plastic film is very popular in Korea because it has a simple structure and less cost than any other greenhouses. Although ti has a main advantage of easy construction, ti has some disadvantage of poor ventilation and uneven light transmission. In order to overcome the problems, large scale single-span pipe greenhouses have been widely popularized. But performance of natural ventilation is very poor because their structures are difficult to in stall the roof vent. Therefore, this study was conducted to improve thermal environment during high temperature season through roof vent installation and reformed shading method for large arched single-span pipe greenhouses. Natural ventilation characteristics with roof vent existence were analyzed by using steady state thermal balance model and gravitational ventilation equation. A case study on the effect of roof vent installation was carried out, and model structures for roof vent installation in large single-span pipe greenhouse were suggested. Besides, greenhouse air temperature difference with shading method was analyzed by the simulation model using PCSMP.