• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.256-263
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• 2011

Recently, curtain wall structure is constructed according to increasing high rise building. Glass is usually used in opening of curtain wall structure and window area ratio is finally increased. Excessive Daylighting and solar radiation by large window area ratio cause discomfort glare and add to cooling load in the case of office that is heavy on lighting and cooling. Therefore, this study suggests to use low transmittance window for solve those problems. Indoor lighting environment and building energy performance were analyzed by increasing transmittance from 10% to 90% and comparing fixed venetian blind. Consequently, the range of transmittance that is possible to daylighting and prevent discomfort glare. Secondary energy consumption is efficient in the case that transmittance is the range of from 20% to 50%, primary energy consumption is nice on from 20% to 40%. If those result put together, the range of window transmittance from 30% to 50% is proper in the office in lighting environment and energy consumption aspects.

• 한국태양에너지학회 논문집
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• 제23권3호
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• pp.73-80
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• 2003

The purpose of this study was to analyze daylighting performance in a semi-infinite size office space for lighting energy conservation. DOE2.1E was used for simulations for the model space of $12\times12\times2.6m$. Nomographs were developed which could simulate work plane illuminance, glare index, energy consumption rate and energy reduction rate for daylighting design. Major results of simulations are as follows ; 1) When blinds facing south were installed, 43% of workplane illuminance diminished, but the flare index didn't exceed the recommended max-glare value. 2) In a semi-infinite office space facing south. energy consumption rate in the case space of 500 lux workplane illuminance is larger then case space of 300 lux workplane illuminance. Therefore, energy reduction rate is increased when the semi-infinite office faces south and naintains 300 lux workplane illuminance level.

• KIEAE Journal
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• 제13권3호
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• pp.97-104
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• 2013

This proposed simulation-based design study is based on the design of residential high-rise buildings in South-Korea. the purpose of this study is to evaluate the amount of daylighting performance passing through building glazing according to sky conditions, orientation of windows and each space of Apartment buildings. The clear sky includes sunshine and is intense and brighter at the horizon than at the zenith, except in the area around the sun. Daylight received within a building is directly dependent upon the sun's position and the atmospheric conditions. Orientation of the building generally used to refer to solar orientation which is the siting of building with respect to solar access. Although any building will have different orientations for its different sides, the orientation can refer to a particular room, or to the most important facade of the building. north-facing windows receive twice the winter sun than east and west facing windows, allowing light and warmth into the home. They can be easily shaded from the high summer sun to help keep the house cool. Ideally, the glazing area should be between 10-25% of the floor area of the room. This paper was calculated by a Desktop Radiance program. The space dimensions were based on a unit module of real constructed apartment having divided into five sections such as living room, room1, room2, room3 and kitchen.

• 한국태양에너지학회 논문집
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• 제34권3호
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• pp.66-74
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• 2014

In this paper, the performance of Hybrid Dimming control system for Daylighting system is evaluated by accredited tests. The system controls the balance of illuminance of daylight between daylight system and LED light system. It makes the normal illuminance of interior without the effects of weather by controlling the LED depending on the brightness of outside. For the tests, 6 diffusers($600{\times}300mm$) were installed in lighting area($36m^2$) and normal operation of the system sensors were tested about the interference of sunlight. The results of the examinations were satisfied with the criteria of accredited tests. Further research is the verification of energy saving effect by comparing the Hybrid Dimming control system to current artificial light system.

• KIEAE Journal
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• 제16권1호
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• pp.57-65
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• 2016

Purpose: The purpose of this study is to analyze the energy performance by applying new technologies for passive and active control. Method: We selected new technologies for passive and active control which are based on formal study by analyzing technology applied to the High-Performance Buildings in various countries. Also, we analyzed energy saving potential for each technologies by breakdown the result of the energy saving rates in detail. Result: For the wall and roof insulating methods, preceding studies showed that up to 21% energy could be saved by improving roof insulation and applying proper outside insulation compared to non-insulation. For the windows and glazing system, preceding studies showed that Low-E glazing system could save up to 11% energy compared to single glazing system. Studies about solar and daylighting controls revealed that effective daylighting dimming control could save 13% of energy compared to uncontrolled situation. Studies on DOAS (Dedicated Outdoor Air System) showed that about 23% energy could be saved compared to standard VAV system. Studies on the active chilled beam showed that about 25% energy could be saved compared to standard VAV system and studies of applying UFAD (Under Floor Air Distribution) could consume 31% less energy than applying overhead system.

• 조명전기설비학회논문지
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• 제21권3호
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• pp.18-26
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• 2007

투과체는 기본적으로 외부환경과 접촉할 수 있는 친화적이고 생태학적인 기능을 가지고 있으며, 이를 통해 유입되는 빛은 실내공간에 다양한 분위기를 연출할 수 있도록 해준다. 이에 본 연구는 투과체가 적용된 사무소건물을 대상으로 채광유입을 증대시킬 수 있는 채광방식을 설계하여 적용 시 실내의 색도와 색온도에 미치는 영향을 분석하였다. 이를 위하여 1/10축소모형을 제작하였으며, Prometric 1421이라는 측정기기를 이용하여 실험을 수행하였다. 측정결과 투과체가 갖는 파장대별 투과특성이 실내의 색도에 영향을 미치는 것으로 나타났으며, 빛의 유입을 증대시키는 채광방식을 설치할 경우 천정면의 색온도에 많은 영향을 주었으며, $5{\sim}20[%]$정도의 색온도를 증가시키는 것으로 나타났다. 따라서 채광시스템을 설치할 경우 활동적인 분의기의 공간이 연출될 수 있을 것으로 기대된다.

• 한국태양에너지학회 논문집
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• 제32권3호
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• pp.104-113
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• 2012

A set of candela distribution curves(CDCs) were generated for a fiber optic dish daylighting system by Photopia under clear sky conditions at different solar altitudes. The candela distribution curves were then exported to Radiance for photometric analysis of a windowless lecture room. Observations were made on the Radiance rendered illuminance images, which provided photo realistic scenes varying with solar altitudes. If no tracking error were assumed, the daylight collection efficiency of the system remained at a constant value of 68.4% during its operation. Higher the solar altitude angle, greater in photometric quantities were observed, which are represented by candela(cd) and total lumens(lm). In all cases considered, however, the angle of light distribution remained fixed reflecting the solar tracking feature of the system. The illuminance uniformity on the workplane lingered around 0.12, which is quite low. This is quite a contrast to its average value of 0.68 of the $2.7m^2$ area directly below the terminal device (diffuser) of the system. The maximum illuminance of 1,340lux was obtained at a solar altitude of 80 degrees.

• 조명전기설비학회논문지
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• 제21권4호
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• pp.1-10
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• 2007

KH University has developed a large sky simulator which is its scale suits international standard. To verify the reliability of the sky simulator, the luminance of 36 points on the inner sky surface was measured and compared with the CIE standard overcast sky model. It was found that the sky simulator can reproduce the CIE standard overcast sky condition with 1.8[%] of mean difference. To identify the differences of daylighting performance, scale model measurements were taken under a real sky and in a sky simulator. Under overcast sky conditions, two kinds of scale model experiments were conducted by using the photometric sensor Li-cor. Firstly, a 1/20 scale model of a side-lit office room 4.9[m] wide, 7.2[m] long, and 2.6[m] high was created. Five measurement points were set at 1.2[m], 2.4[m], 3.6[m], 4.8[m], and 6.0[m] from the window. The mean difference of the light factor between the sky simulator and real sky was 7.1[%]. Secondly, a 1/30 scale model of a top-lit atrium 15[m] wide, 15[m] long, and 15[m] high was created. The measurement point was set at center of the room and the well indexes of the model were set in 5 types. The mean difference of the light factor between the sky simulator and real sky was 1.7[%]. This proved that the sky simulator is fully accurate and usable for daylighting research.

• 대한기계학회논문집B
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• 제35권8호
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• pp.799-804
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• 2011

본 논문에서는 자연채광 시스템 LFLP(Linear Fresnel Light Pipe)와 DBLP(Double Blind Light Pipe)시스템을 비교하였다. LFLP시스템은 평행한 빛을 선형프레넬렌즈를 이용하여 선형 형태로 빛으로 집광하여 자연채광에 이용하는 시스템이며, DBLP시스템은 베네시안 형태의 블라인드를 이용하여 빛을 반사시켜 자연채광에 이용하는 시스템이다. DBLP시스템은 LFLP시스템을 개선한 것으로 시스템 앞쪽에 위치한 블라인드는 태양의 고도에 따른 빛을, 뒤쪽에 위치한 블라인드는 태양의 방위각에 따른 빛을 변광부로 반사시키도록 설계 되었다. DBLP시스템의 변광부는 콘모양으로 이루어 져 있으며 블라인드에 의해 반사된 빛을 산광부로 보내주는 역할을 하며, 산광부로 들어온 빛은 실내조명에 사용된다. 따라서 맑은날(clear sky)을 기준으로 두 시스템의 효율을 비교하면 DBLP시스템이 LFLP시스템보다 세배 높게 나오는 것으로 나타났다.

• 한국터널지하공간학회 논문집
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• 제13권5호
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• pp.371-383
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• 2011

터널은 밝기가 급변하는 공간으로 운전자의 안전을 위해 조도의 확보가 중요하고, 터널의 조명설비는 주간과 야간에 모두 운영되고 있어 많은 전기 에너지가 소비되고 있다. 따라서 본 연구는 주간에 터널의 자연채광을 효율적으로 이용하여 에너지를 절약할 수 있는 방안으로 RADIANCE 시뮬레이션 프로그램을 사용하여 자연채광 반사거울 시스템의 채광 성능을 평가해 보았다. 프로그램을 사용하여 바(bar)형식과 폴(pole)형식으로 구분하여 벽면과 바닥면으로 주광을 유입한 결과 터널입구부로부터 20 m에서 바형식의 형태가 터널내부의 높은 조도를 확보하는 것으로 나타났다.