• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1625-1629
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• 2009

The new paradigm called 'Low Carbon Green Growth' involved in reducing greenhouse gas is on the rise as a critical issue worldwide. The essential of Kyoto protocol issued in 1997 is to achieve the sustainable economic growth environments by converting existing production system to eco-friendly one. The protocol imposes the liability to reduce greenhouse gas to the countries joined to it. The paradigm is directly involved in the energy consumption and environmental pollution caused by construction activities. Value Engineering which are mainly applied in the design phase in practice is a measure to improve the value of a constructed facility by analyzing and/or appraising the functions and costs of it. However, an appropriate method which assesses eco-friendliness of constructed facility has not been propose by researchers. This paper proposes a method which assesses the performance involved in eco-friendliness of constructed facility using Value Engineering (VE) in the design phase. The method estimates the environmental cost relative to the amounts of energy consumption and environmental pollution occurred over the entire project life cycle. The database called "Life Cycle Inventory DB", which stores information about the amounts of environmental pollution, is used. The algorithm which retrieves the amounts of environmental pollutions from the DB and converts them into environmental costs is developed. The algorithm is implemented into a system which quantifies the eco-friendliness of constructed facility in the design phase using VE.

• 한국농공학회지
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• 제38권2호
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• pp.145-151
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• 1996

Wind force coefficients of multi-span arched greenhouses with respect to wind direction of $0^{\circ}$ and $30^{\circ}$ were estimated to give more reasonable coefficient. The conventional and subdivided division types of wind force coefficient distribution diagrams were constructed by using the wind tunnel experimental data. Bending moments on the greenhouses were determined through structural analysis using obtained wind force coefficients, and were analyzed. Because actual wind pressure values on a face of greenhouse varied with locations, the more divisions of wind force coefficient distribution were subdivided, the better distribution type was coincided with actual state. In order to calculate the more accurate section force occurred on the arched greenhouse by the wind loads, it was recommendable that the wind force coefficient distribution should take more subdivision type. The maximum bending moment at the multi-span greenhouse frame at wind direction of $30^{\circ}$ was greater than that at O。, therefore the wind force coefficient at inclined wind direction to the wall was needed to be considered for the multi-span greenhouse structural design.

• 생물환경조절학회지
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• 제25권2호
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• pp.123-132
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• 2016

The importance of energy saving technology for managing greenhouse was recently highlighted. For practical use of energy in greenhouse, it is necessary to simulate energy flow precisely and estimate heating/cooling loads of greenhouse. So the main purpose of this study was to develope and to validate greenhouse energy model and to estimate annual/maximum energy loads using Building Energy Simulation (BES). Field experiments were carried out in a multi-span plastic-film greenhouse in Jeju Island ($33.2^{\circ}N$, $126.3^{\circ}E$) for 2 months. To develop energy model of the greenhouse, a set of sensors was used to measure the greenhouse microclimate such as air temperature, humidity, leaf temperature, solar radiation, carbon dioxide concentration and so on. Moreover, characteristic length of plant leaf, leaf area index and diffuse non-interceptance were utilized to calculate sensible and latent heat exchange of plant. The internal temperature of greenhouse was compared to validate the greenhouse energy model. Developed model provided a good estimation for the internal temperature throughout the experiments period (coefficients of determination > 0.85, index of agreement > 0.92). After the model validation, we used last 10 years weather data to calculate energy loads of greenhouse according to growth stage of greenhouse crop. The tendency of heating/cooling loads change was depends on external weather condition and optimal temperature for growing crops at each stage. In addition, maximum heating/cooling loads of reference greenhouse were estimated to 644,014 and $756,456kJ{\cdot}hr^{-1}$, respectively.

• 생물환경조절학회지
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• 제23권2호
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• pp.95-108
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• 2014

본 연구는 성주지역에 적합한 참외재배용 내재해형 온실을 개발하기 위하여 참외 재배온실의 구조현황 조사, 최근 기상자료가 반영된 설계하중 산정, 온실모델 설정 및 구조안전성 분석을 수행하였으며 결과를 요약하면 다음과 같다. 성주지역 참외온실의 구조적 특성을 파악하기 위하여 현장 조사한 결과, 온실의 지붕형상은 아치형이 가장 많았으며, 최근에 시공한 온실일수록 복숭아형이 많았으며 폭이 넓어지고 동고도 높아지는 추세였다. 그리고 성주지역에 가장 인접한 구미기상대의 기상자료를 이용하여 재현기간에 따른 설계풍속 및 설계적설심을 산정할 수 있는 계산식을 유도하였으며, 내재해형 온실규격을 만족하는 재현기간 30년의 적설심은 23.7cm, 풍속은 $33.8m{\cdot}s^1$로 계산되었다. 이러한 성주지역의 내재해형 설계기준을 만족하는 참외재배용 단동온실 4종, 2연동온실 및 연결온실을 각각 1종씩 총 6종의 모델을 개발하였다.

• 생물환경조절학회지
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• 제4권2호
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• pp.232-239
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• 1995

This study was carried out to get required torque data needed to design and develop a roll-up ventilation system in a pipe-constructed plastic film green-house. The results obtained from this study are as follows : 1. The required torques of a roll-up ventilation system in greenhouse are the functions of its length. The torques should multiplied by the conversion coefficients (2.0 in ceiling vent, 1.8 in side vent) in case of application. 2. In constructing pipe-constructed plastic film greenhouse, a shaft pipe is the largest essential element in roll - up shaft weight constitution which have an effect on the required torques. Therefore, the pipe should be light using nonferrous materials like aluminum alloy. 3. A planetary reduction ventilator of differential ring gear type is suitable for a roll-up ventilation system, because it can make high efficient reduction just using the first step shift.

• 한국지열·수열에너지학회논문집
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• 제5권2호
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• pp.1-6
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• 2009

In this paper, RETScreen program model has been investigated to predict the economic analysis for greenhouse and livestock facility. Load calculation result was 35.2[kW] of greenhouse and the calculation result of livestock facility was 35.5[kW]. Also, a case study of the RETScreen program indicated that the equity payback is 6.9 years for a greenhouse facility and the equity payback is 9.5 years for a livestock facility.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2006년도 춘계학술대회
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• pp.129-134
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• 2006

Environmental pollution was begun to rise suffering increase in population with fast economic growth after industrial revolution teeth. Be, air pollution out of them, pollution most seriously happen, and began to cope in greenhouse gas danger from this time. Presents greenhouse gas problem is becoming universal interest ago, and our country is becoming problem. Wish to reduce greenhouse gas in world climatic change convention through Gyoto mekanijeum to reduce greenhouse gas. Wish to present standard for consideration in among CDM business, base line formation out of them.

• 생물환경조절학회지
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• 제23권4호
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• pp.391-400
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• 2014

The number of large scale greenhouses has recently been increasing to cope with mass consumption of agricultural product. Korean government announced a new development plan for constructing greenhouse complex in reclaimed lands for the purpose of improvement in exports and activation of domestic market of agricultural product. Wind environment in the reclaimed land is totally different from that of inland area, and it can give a strong influence on ventilation performance of naturally ventilated greenhouse facilities. In this study, internal airflow analysis of naturally ventilated greenhouse built on a reclaimed land was conducted using wind tunnel and PIV for validation research. Later, the PIV measured results will be used to improve the accuracy of 3 dimensional CFD simulation in the future. Wind profile at a reclaimed land was produced using ESDU program and it was applied to the wind tunnel. The calculated error was only 5% and 0.96 of correlation coefficient, implying that the computed profiles were designed properly. From the measured results, when external wind speed changed from $1m{\cdot}s^{-1}$ to $1.5m{\cdot}s^{-1}$, air velocities inside the greenhouse which PIV measured were also increased proportionately in case of both side vent open and side-roof vent open. Considering reduced ratio of air velocity inside the greenhouse, it was measured a minimum of 40% in case of side vent and 30% in case of side-roof vent compared with external wind speed from each vent type. From the quantitative and qualitative PIV analysis, the PIV measured results indicated that there were well ventilated and stagnant areas in the greenhouse according to external wind condition as well as ventilation design.

• 농업과학연구
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• 제40권4호
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• pp.317-323
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• 2013

This research was conducted to obtain the basic information for establishment of standard guidelines in the design and installation of roof ventilation system in single-span plastic greenhouse. To achieve this, the greenhouse structure & characteristics, cultivation status, and ventilation system were investigated for single-span greenhouse with roof ventilation system cultivating the Cucurbitaceae vegetables, watermelon, cucumber, and oriental melon. Most of single-span watermelon greenhouse in Haman and Buyeo area were a hoop-style and the ventilation system in those greenhouses mostly consisted of two different types of 'roof vent (circular or chimney type) + side vent (hole) + fan' and 'roof vent (circular type) + side vent (hole or roll-up type)'. The diameter of circular and chimney-type vent was mostly 60cm and the average number of vents was 10.5 per a bay with vent spacing of average 6.75m. The ratio of roof vent area to floor area and side vent area in the single-span watermelon greenhouse with ventilation fan were 0.46% and 7.6%, respectively. The single-span cucumber greenhouse in Haman and Changnyeong area were a gable roof type, such as even span, half span, three quarter and the 70.6% of total investigated single-span greenhouses was equipped with a roof ventilation fan while 58.8% had a circulation fan inside the greenhouse. The ratios of roof vent area to floor area in the single-span cucumber greenhouse ranged from 0.61 to 0.96% and in the case of the square roof vent, were higher than that of the circular type vent. On average, the roof ventilation fan in single-span cucumber greenhouse was equipped with the power input of 210W and maximum air volume of $85.0m^3/min$, and the number of fans was 9.75 per a bay. The number of roof vent of single-span oriental melon greenhouse with only roll-up type side vent ranged from 8 to 21 (average 14.8), which was higher than that of other Cucurbitaceae vegetables while the vent number of the greenhouse with a roof ventilation fan was average 7 per a bay.

• 한국산학기술학회논문지
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• 제18권7호
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• pp.58-62
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• 2017

본 연구에서는 자연광의 효과를 가장 잘 활용할 수 있는 건축구조물인 한국형 유리온실 구조를 축약시킨 유리온실을 기준하여 유리온실의 설계 전 건축방법에 따른 자연광의 효과적인 예측을 위해 조명시뮬레이션을 하고자 한다. 최적 시뮬레이션을 위해 상용화된 여러 가지 조명 소프트웨어들 중에서 AGI32 프로그램을 이용하였다. 그 결과, 유리온실의 삼각구조지붕 꼭지점 위치에 대한 조도 및 균제도(최소조도/평균조도) 분석 결과 자연광 효과에 중요한 인자가 아니며, 하지 일때 자연광의 조도값이 가장 크며 시간도 가장 긴 것을 알 수 있었다. 또한, 유리창의 투과율이 높아짐에 따라 예측되었던 바와 같이 조도 값이 증가하는 것을 확인할 수 있으며 14시일 때가 조도 값이 가장 높으며 이때의 유리 투과율에 따른 조도 변화율은 89 [lux/%]임을 알았다. 또한, 유리온실의 설치 시 배향각은 균제도 특성을 고려하여, 유리온실의 설치 배향각은 $30[^{\circ}]$ 혹은 $150[^{\circ}]$로 하는 것이 자연광 효과를 최대로 할 수 있음을 알았다.