• Title, Summary, Keyword: 광선반

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An Analysis of Daylighting Performance of Light Shelf in Office Building (사무소 건물에서 광선반의 채광성능 분석)

  • Park, Byung-Il;Yang, In-Ho;No, Mi-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.8
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    • pp.1-11
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    • 2008
  • The purpose of this study is to present the design guideline for an effective application of light shelf in office building. For this, the computer simulation using Daylighting System of 3Ds Studio Max was performed, and the optimal values related to design factors such as a depth, a surface reflectance and a installation angle of light shelf were obtained. Then daylighting performance of light shelf using the optimal values was analyzed, and the simulation results show that the installation of the optimal light shelf can improve a indoor lighting environment in office building.

A Study on the Computer Simulation Estimate of Light Shelf Using Lightscape (Lightscape를 이용한 광선반의 시뮬레이션 평가 연구)

  • Cho, Yil-Sik;Kim, Ki-Se;Yoon, Jong-Ho;Lee, Jin-Sook
    • Journal of the Korean Solar Energy Society
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    • v.23 no.3
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    • pp.93-102
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    • 2003
  • One of the promising optical daylighting systems is light shelf type daylighting system, Two types of lighting performance analysis methods are 1) Ray-Tracing method and 2) Radiosity method. The purpose of this paper is to compare two methods in terms of advantages and disadvantages by further looking at the detail algorithm. Also. model verification with Lightscape simulations has been conducted. Effectiveness of light penetration factor in terms of daylighting factor has been investigated and quantified. In summer time. the performance of the light shelf was twice better than the case without it.

Daylighting Performance Evaluation of window Integrated Light Shelf System (창호일체형 광선반 시스템 채광성능 평가)

  • Chung, Yu-Gun
    • KIEAE Journal
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    • v.7 no.5
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    • pp.41-46
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    • 2007
  • The lightshelf system, a horizontal shading and light redirect device, should improve the visual environment by optimal light distributions and intense illumination levels of a interior. This study aims to evaluate the daylighting performance of window integrated lightshelf systems by computer simulations. For the study, the standard office plan is analyzed through the field surveys. And then, the various lightshelf types attached window systems are picked out from existed research results. The max, minimum and average illuminance levels of interiors and illuminance distributions are evaluated by Lightsacpe 3.2 programs based on the installing height, shape type and moving angle of lightshelfs. As results, it is suggested that the optimum lightshelf shapes are the height 1.8m and the width 600mm. Also, in mixed lightshelf, the outside width 600mm, inside width 400 are efficient on indoor daylighting performance.

Exploration of a Light Shelf System for Multi-Layered Vegetable Cultivation (자연광 다층 작물재배를 위한 광선반 시스템에 관한 연구)

  • Jang, Seong-Teak;Chang, Seong-Ju
    • KIEAE Journal
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    • v.13 no.2
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    • pp.61-66
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    • 2013
  • This study is to eliminate the need for conventional high density plant factory's artificial light source such as LED to reduce the initial investment of the light source installation as well as the operation cost. Use of solar light could enhance the quality of the vegetables similar to those grown in the natural environment. Provision of solar light into the multilayer vegetable cultivation facilities and collecting maximum and sustainable sunlight without too much loss by tracing solar path and properly distributing it through careful control during daytime are crucial for realizing the investigated rooftop light shelf system for multi-layered vegetable cultivation. In this study, we developed an innovative way of effectively allocating sunlight inside even to otherwise shaded zone of a multi-layer vegetable cultivation facility. To prove the effectiveness of the system's sunlight collection and distribution capability, both simulation and experiment in Daejeon are performed and the outcome is analyzed.

Volume Ray Casting Acceleration Method using Modified Marching Cubes Tables (변형된 마칭큐브 테이블을 이용한 볼륨 광선 투과법 가속화)

  • Lim, Suk-Hyun;Kim, Ju-Hwan;Shin, Byeong-Seok
    • Journal of KIISE:Computer Systems and Theory
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    • v.36 no.3
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    • pp.210-216
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    • 2009
  • Several empty-space leaping methods have been proposed for CPU-based volume ray casting. When sample points are located in semi-transparent cells, however, previous leaping methods perform unnecessary resamplings even if the scalar values on those points are confined within transparent range. A semi-transparent cells leaping method for volume ray casting using the Marching Cubes algorithm is proposed to solve this problem in our previous work. When a ray reaches a semi-transparent cell, our method performs in-out test between current sample point and the bounding box enclosing the triangles generated by the Marching Cubes. If the sample point lies on outside of the bounding box, we estimate the point is regarded as transparent. In this case, the ray advances to the next sample point without performing a resampling operation. We can frequently refer the tables for neighboring voxels, however, when we exploit conventional data structures of the Marching Cubes. We propose modified Marching Cubes tables for solving this problem.

Visual Performance Evaluation of Daylighting System with Sloped Lightshelves (광선반 채광시스템의 시각적 성능 평가)

  • Kim, Jeong-Tai;Shim, In Bo
    • KIEAE Journal
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    • v.6 no.2
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    • pp.3-10
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    • 2006
  • This study assessed the visual performance of luminous environment by the lightshelf. The subject survey method was used and results are presented and analyzed. The lightshelf daylighting system was developed by LAEL at KH University and was applied on the window of a mock-up office. The questionnaire for assessing visual performance contains 9 questions with 7 grade bipolar scales. The experiment was conducted during the bright part of the day from noon to one thirty on June 7, 2006. The questionnaire for assessing visual performance contains 9 questions with 7 grade bipolar scales. During the experiment was carrying out, the work plane illuminance and luminous distribution at surrounding the windows was measured. The semantic differential rating data of experiment were analyzed by t-test and factor analysis using SPSS 12.0 statistics package. The visual performance of the lightshelf was more positive. The factors affecting the visual performance are task performance and visual comfort. The subjects were more comfortable in a room installed with lightshelves on both the task performance and the visual comfort aspect. Therefore, the application of sloped lightshelf daylighting system improves visual performance of luminous environment.

Performance Assessment of Building Envelopes II: LightShlef, RetroLux (외피 친환경 성능평가 II: 광선반, RetroLux)

  • Kim, Deuk-Woo;Park, Cheol-Soo
    • 한국태양에너지학회:학술대회논문집
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    • pp.83-90
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    • 2009
  • As a series of 'Performance Assessment of Building Envelopes I: Double Skin Facade', three types (interior, exterior, mixed (int.&ext.)) of lightshelves and RetroLux were examined in terms of $CO_2$ emissions. It is shown that the exterior lightshelf could achieve the most energy savings (9.6-38.7%) in general office buildings due to blocking solar radiation before entering the indoor space. However, the interior lightshelf is the worst (1.4-5.2%) among three of them. The RetroLux has two components: (1) sun-reflector (first louver component), (2) light shelf for improving daylight induction (second louver component). Due to these two components, solar radiation from windows is filtered depending on seasonal variation (solar altitude). Therefore, the RetroLux can reduce 18.0-27.9% of annual energy consumption (both cooling and heating), and $552-3,290Won/m^2{\cdot}yr$ of operation cost is saved.

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A Study on the Effect of inflow Daylight according to the installation method of controlling Light Shelf and Blind in the Room of General Hospital (종합병원 병실 내 광선반과 블라인드 설치 방식에 따른 자연채광 유입 효과 연구)

  • Cho, Ju Young;Lee, Hyo Won
    • KIEAE Journal
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    • v.13 no.4
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    • pp.3-10
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    • 2013
  • This study aims to identify convenient surrounding of the hospital room to be improved by specifically focusing on light environment and to examine a change of inflow of the daylight in the hospital room by using blind and light shelf device as base data of preliminary research for comprehending the relationship between healing environment and natural day light. Simulation analysis on previous facilities and the installation of horizontal light shelf that derives the inflow of day light has been specifically referred by using ECOTECT2011 program. In case of C-facility that mostly adjoined to exterior spaces, it was shown to be closer to a proper uniformity factor when an angle was controlled on the light shelf with blind installed at the same time. However, it was not overall appropriate because of visual displeasure occurred from inflow of much day light. In conclusion, it is the form of flat surface such as H-facility that provides an effect after installing the device to derive day light. Especially, it was shown that interior day light environment was improved when installing blind and controlling the angle at the same time.

An Analysis of Propagation Model in Half-Canyon Structure with Slope using Multi-Ray Model (경사면을 갖는 반-협곡 구조에서 다중-광선 모델을 사용한 전파 모델 해석)

  • Lee, Hwa-Choon;Choi, Tae-Il
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.1
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    • pp.173-178
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    • 2020
  • A multi-ray model has been used to interpret radio transmission losses in half-canyon structures with slope and to formulate a multi-ray propagation model depending on the angle of slopes. The cut-off angles for the third and fourth paths, which are the slope-sided reflection paths of the transmission and reception radio waves determined by the inclined angles of the slope, were calculated with the height and location of the transmitter and receiver. To predict transmission losses in an inclined plane environment, the embankment environment where the actual slope exists was modeled and simulated to calculate the loss of propagation transmission, and the radio wave transmission loss was confirmed by the measurement for the frequency band 1 to 6 GHz. Simulation results and measurement results showed similar trends in radio transmission loss, and radio transmission loss predictions and measurement results for various terrain information can be used in the design of radio propagation service.