• Title, Summary, Keyword: Horizontal illuminance

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Comparison of Measurement and Calculation Model of Solar Luminous Efficacy for All Sky Conditions in Seoul (천공구분에 따른 서울지역 일사의 발광효율 측정 및 예측모델과의 비교 연구)

  • Yoon, Kap-Chun;Yun, Gyeong;Kim, Kang-Soo
    • Journal of the Korean Solar Energy Society
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    • v.31 no.6
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    • pp.86-94
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    • 2011
  • For accurate dayligh tsimulation, accurate exterior illuminance is necessary. But, Korea Meteorological Agency provides only the solar irradiance data. Thus, there is a need for the research on luminous efficacy. In this study, global horizontal irradiance, diffuse horizontal irradiance, global horizontal illuminance, and diffuse horizontal illuminance were measured to calculate the luminous efficacy in SEOUL. And, we evaluated the applicability of the Perez's model by comparing the measured data and calculated data. As a result, measured global luminous efficacy is 126(110~129)lm/W and diffuse luminous efficacy is 127(115~133)lm/W in Seoul. Perez's model was relatively accurate with 5% difference in the diffuse luminous efficacy. But, it can be predicted about 15% lower in the global luminous efficacy.

A Study On the Design of Balaced Illuminance Using Lumen Flux Method (광속법을 이용한 등배치 설계에 관한 연구)

  • 최홍규;최병숙;정성윤;김진성
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.175-180
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    • 1999
  • This paper presents the effective design of the change of average illuminance and the arrangement of lamps by changing the form of working area and adjusting the distance between the wall and light. This study is intended to simplify the complex calculation of illuminance through the development of application program. It's plan to study application programs that can attain the value of advanced uniformly-distributed illuminance and average illuminance by changing the distance between the horizontal/vertical wall and lamp and between the horizontal/vertical lamp and lamp.

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Illuminance Distribution Analysis by Lighting Tower Position of o Soccer Stadium (축구 경기장의 조명타워 위치에 따른 조도분포 해석)

  • 김길영;최홍규;최병숙
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.1
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    • pp.1-8
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    • 2004
  • Nowadays the soccer becomes one of the best spot lighting sports in the world Especially the 2002 Korea-Japan World Cup was deeply impressed on all the korean. One goal of illuminating engineering should be the design of lighting system that can provide consistently high task visibility regardless of where a task might be located within a working space. The television broadcasting on the soccer has been an important role in the media. The standard of FIFA(The Federation Internationale do Football Association) requires recommended illuminance levels for artificial lighting for a player, an audience, TV broadcasting, as well as everybody in the stadium. This paper has proposed an algerian to select the suboptimal lighting tower position for watching and TV broadcasting a soccer game within a pleasant environment and an optimum illuminance distribution. The position using the software Philip's Calculux was chosen based an the calculations of a horizontal illuminance, vertical illuminance, uniformity, glare, and so on by changing lighting tower positions.

A Study of Simplified Calculation Methods for Outside Vertical Illuminance using VBA (VBA(Visual Basic for Applications)를 활용한 실외 수직면 조도 간이계산법에 관한 연구)

  • Yun, Su-In;Kim, Kang-Soo
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.12
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    • pp.65-72
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    • 2018
  • The purpose of this study is to predict vertical illuminance accurately at the design stage of a building without the help of simulation tools. Comparing two well-known vertical illuminance prediction algorithms with measured values, it is verified that the Igawa model is more consistent with the measured values than the Perez model. Using the DIVA program, we simulated the vertical illuminance at 30-degree intervals from south to north, compared with the vertical illuminance calculated with the Igawa model. The result of calculation values were verified from 120 degrees east to 120 degrees west. The vertical illuminance values with each of three shade devices were calculated using the Igawa model, and compared with the vertical illuminance simulated by DIVA program. As a result, all the errors when installing horizontal / vertical / grid shade divices were included in the error standard specified by ASHRAE.

The prediction of reduction ranges of daylight illuminance in small office for sky and shading conditions (천공 및 차양조건에 따른 소규모 사무실의 주광 조도 감소범위 예측)

  • Jang, Seo Yeon
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.10 no.3
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    • pp.33-41
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    • 2019
  • This study examines the distributions of daylight illuminance in a small office space under clear and cloudy sky conditions. Three shading conditions using Venetian blinds were applied for the analysis of daylight illuminance. Computer simulations using the Lightscacpe were conducted for the daylight conditions applied to the office space. Results indicate that the illuminance differences between clear and cloudy sky for south-facing conditions were greater than those for north-facing conditions. The differences in December and June were the greatest and smallest, respectively. For the north-facing conditions, the daylight illuminance at 10:00, 12:00 and 14:00 in June and September under the cloudy sky was higher than those under the clear sky conditions. For all daylight conditions, the biggest amount of illuminance reduction occurred when the shading device conditions were changed from the no blind to the 45 degree blinds. As the distance from window increased, the shading effect that occurred when the shading device conditions were changed from the horizontal blind to the 45 degree blinds increased.

Assessment of Daylight Environment on Light Pipe System Under Different Solar Position (태양의 위치에 따른 광파이프 시스템의 실내 주광환경평가)

  • Shin, Hwa-Young;Kim, Jeong-Tai
    • Journal of the Korean Solar Energy Society
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    • v.28 no.6
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    • pp.78-86
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    • 2008
  • The aim of this paper is to show the daylight environment of a light pipe system according to sun movement. A light pipe system has been mounted on the roof of the windowless full scale model: the solar spot has diameter of 0.65m and is 1.3m long, giving an aspect ratio of 1:2. The full scale model was installed on the rooftop of the SHINAN apartment in Yongin city that has no obstructions against sunlight. The test room is equipped with sensors for the measurements of the internal illuminance and has an area of 6m(W)$\times$6m(D)$\times$4m(H). The system has been monitored with a data-logger to evaluate the cumulative distribution of illuminance on a floor-plane from 16th, April to 29th, May, 2008 over one month and selected clear sky condition. For the daylight performance of floor area, the totally 49 measuring points has been used to determine the internal illuminance and an HP datalogger(HP34970A) records the measurements for one consecutive month. The horizontal external illuminance has been measured with two outdoor sensors. This paper presents the results of monitoring light pipe system with internal/external illuminance ratio and cumulative frequency distribution of floor-plane illuminance are discussed The results show that lightpipe is proficient device for introducing daylight into the building. However It provided different daylight indoor environment with wide or narrow Interquatile range of illuminance, internal/external illuminance ratio and cumulative frequency distribution according to solar positions under suuny sky condition. For more achieving the improvement of lightpipes also include energy savings, user visual comfort with various indicators; seasonal solar height, room and lightpipes geometries.

Simulation-assisted Optimal Lighting Control for a Factory Building (시뮬레이션 모델을 이용한 공장 건물의 조명 최적 제어)

  • Kim, Young-Sub;Kim, Jae Min;Shin, Han Sol;Park, Cheol-Soo
    • Journal of the Architectural Institute of Korea
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    • v.36 no.8
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    • pp.127-135
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    • 2020
  • Lighting control can be categorized into open-loop and closed-loop. For the closed-loop control, illuminance sensors are generally mounted on a horizontal workplane, or the nearest wall/ceiling. As the size and complexity of an indoor space increases, the number of sensors and its corresponding control become complex because illuminance at a certain point is influenced by multiple neighboring lighting fixtures. The open-loop control is disadvantageous because it can't reflect the illuminance level of a workplane. With this in mind, the authors aim to develop an approach where lighting simulation model could predict the illuminance level at any points of interest, hereby replacing illuminance sensors, and lead to electric lighting energy savings. For this purpose, Radiance, one of the most sophisticated lighting simulation tools, was first employed for daylit and electric lighting prediction of a target building. Then, a surrogate model, ANN (Artificial Neural Network) model, was developed for fast computation and optimal control. Unknown parameters, e.g. reflectances of ceiling, floor, walls, transmittance of glass and light loss factor, were estimated. It was found that the calibrated model's prediction is accurate and the proposed approach can save lighting energy by 18.6% for three days' validation period (Mar 9-12, 2020) conducted at the target building.

Analysis on Luminous Environment and Subjective Image of Two Different Commercial Streets at Night - Focused on View Point of Pedestrian - (야간상업가로의 조명물리량 및 이미지 분석 - 보행자 시점을 기준으로 -)

  • Shin, Ju Young;Kim, Jeong Tai
    • KIEAE Journal
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    • v.7 no.4
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    • pp.31-38
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    • 2007
  • Streetscape plays on important role in urban cities. Characteristics of streets is basically defined by the building facade, signs, plants and paving during the daytime. However at night, street receives a new appearance due to the shop light from the buildings, exterior lightings, signboards and street light, and it creates most of the image of the streets. This study aims to analyze the luminous environment and its subjective image of two different pedestrian's commercial streets. Insa-dong street and Myungdong street were chosen for the study. Horizontal illuminance and luminance on building surface, advertisement billboards and pedestrian road were measured. Thirty students were asked to rate the five scaled questionnaire on their subjective images of the streets. Statistical analysis including profile, correlation and T-test are conducted and some findings are discussed

Indoor Illuminance Evaluation on a Mirror Sunlighting System Applied to the Apartments under Real Sky Condition (거울형 태양광 채광시스템의 실제 건축물 적용에 따른 실내주광조도 평가)

  • Jung, Joo Hee;Kim, Jeong Tai
    • KIEAE Journal
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    • v.10 no.4
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    • pp.137-145
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    • 2010
  • Active sunlighting systems have been applied to deliver sunlight into the indoor space where natural light is insufficient, mainly because of the congested high-rise buildings in urban areas. Among various active sunlighting systems, a mirror sunlighting system which is simple structure and economically reasonable has been widely used in different types of spaces such as underground, north facing place and atrium. This study was to evaluate the mirror sunlighting systems, which were consisted of the first mirror of $3.5m{\times}2.5m$, the eight sets of the second mirrors of $1.0m{\times}1.25m$ and a sun tracker. Ten sets of the systems were installed for 40 apartment living rooms, the configuration of $3.5m(W){\times}4.0m(D){\times}2.5m(H)$ where sunlighting were not possible due to high retaining walls located in the front of the living rooms. The 45 HOBO data logger sensors for the indoor illuminance were equipped and 2 Li-cor photometers for outdoor illuminance. Both indoor and outdoor horizontal illuminances were monitored every second from 9am to 3pm on 17 January 2010 under clear sky condition. The results showed that the indoor illuminance of installed mirror sunlighting system was significant relationship with outdoor illuminance and increased the indoor illuminance level by 4.2 times on the whole floor space, by 8 times on the sun patch space of 6m2 and even by 2 times on the no sun patch space. In addition, the luminous conditions of the living room under real sky conditions met the KS recommendation for difficult task (600-1000-1500 lux) such as sewing and reading on whole floor space and sun patch space. It was proved that the benefits of mirror sunlighting systems included an effective technology for penetrating daylight into indoors where sunlighting was not possible and improving occupants' satisfaction and health, and contributing to energy saving in apartments during daytime.

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.