• Architectural research
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• 제4권1호
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• pp.17-23
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• 2002

Daylight simulation methods play an important role for the prediction of daylight illuminances in underground spaces. This daylighting project is designed to compare daylight prediction methods for the application of large underground spaces. In this study, actual measurements were conducted under overcast and clear sky conditions. Also, computer simulations by Radiance, Superlite IEA 2.0 program and scale model testings were conducted to be compared with measured data. Simulation results show the data by Radiance, Superlite IEA 2.0 and the scale model are similar to the measured data in two underground spaces in Seoul. Overall results show that Radiance and superlite IEA 2.0 proved to be useful to predict daylight illuminances even in big underground spaces.

• 한국태양에너지학회 논문집
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• 제24권2호
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• pp.17-23
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• 2004

Daylight illuminance levels in a small space were calculated using the Superlite program under limited conditions of the turbidity and thickness of condensible water of atmosphere. Three sky conditions(clear sky with direct sun, clear sky with no direct sun, overcast sky with no direct sun) were used. The atmospheric conditions significantly impacted the illuminance levels under especially a clear sky with direct sun. The overcast sky with no direct sun provided no difference for the illuminance levels in the space. As the calculation points moved away from a window, reflected illuminance levels gradually increased but direct illuminance levels significantly decreased.

• 한국전산구조공학회논문집
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• 제24권2호
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• pp.193-200
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• 2011

본 연구를 통해 superlite라 불리는 단열 파우더를 채용한 NO96 멤브레인 타입 LNG선 단열 화물창의 만선항해 시 LNG의 BOR(Boil-Off Rate) 예측모델을 제시하였다. LNGCC(LNG Cargo Containment)의 비정상상태 열전달 FEM모델은 만선항해 시 대기 및 해수 조건을 반영하고 복잡한 화물창 단열구조에 균질화 기법을 적용하여 구축하였다. BOR은 만선항해중 LNGCC 내부로 침입하는 총 열량을 이용하여 평가되었으며, 주요 변수에 따른 BOR의 변화는 파라메트릭 열전달해석을 통하여 분석하였다. 그리고 파라메트릭 BOR 특성해석 결과를 토대로 LNG선의 탱크 크기, 단열층의 두께 그리고 superlite의 열전도율을 함수로 하는 BOR 예측모델을 유도하였다. 비선형 과도 열전달해석을 통해 직접 구한 BOR과의 비교를 통해 유도한 예측모델은 최대 1% 이내의 상대오차를 나타내었다.

• Architectural research
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• 제2권1호
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• pp.41-46
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• 2000

The sawtooth skylight is an excellent daylighting concept for the uniform interior illuminance over large working areas. In computer simulation, it is difficult for an architect to get accurate daylight illuminances for the spaces where sawtooth apertures are applied. In this study, daylight prediction algorithms for sawtooth apertures are developed. The flux transfer method is applied for this study to predict daylight illuminances. The simplified equations from this study can be used effectively for preliminary prediction of daylight in sawtooth spaces.

• Architectural research
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• 제1권1호
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• pp.41-46
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• 1999

The configuration factors in the flux transfer method are applied to calculate daylight factors reaching a station point. To analyze the window equipped with a louver system, geometrical correlation is used for the length shielded by the louver. The space in front of a window is assumed to be an imaginary outdoor space for calculating the luminance of the louver system. The data calculated from this study are compared with SUPERLlTE simulation data and the scale model data. Scale model data are collected on the roof of the Engineering building at Korea University in Seoul under the uniform sky condition.