• Title/Summary/Keyword: 투광등

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Design and Fabrication of a LED Flood Light (LED 투광등의 설계 및 제작)

  • Kim, Dong-Geon;Cha, Sang-Wook;Cho, Hyang-Eun;Kim, Il-Kwon;Kil, Gyung-Suk
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2011.10a
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    • pp.72-72
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    • 2011
  • 본 논문에서는 기존 투광등을 대체하기 위한 100 W급 LED 투광등에 대하여 기술하였다. LED 투광등을 안정적으로 구동하기 위하여 정전류 회로를 적용하였으며 최대 DC 60 V까지 구동이 가능하다. 3 W급 백색 LED 10개를 직렬로 배치하였으며, 병렬 4채널이 되도록 제작하였다. 시제작 LED 투광등의 입력전압은 DC 48 V이며 채널당 520 mA의 정전류로 구동된다.

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The Technical Trend of Heat Dissipation for High Power LED Flood Light (고출력 LED 투광등의 방열 기술 동향)

  • Kim, Ki-Yun;Ham, Kwang-Keun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.214-217
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    • 2009
  • 본 논문에서는 고출력 LED 투광등의 방열 기술 동향을 살펴본다. 이를 위해 LED 방열에 사용되는 대표적 기술로서 LED 패키지 방열 기술, 공랭식 방열 기술, 수냉식 방열 기술, 열전 소자 방열 기술에 대한 기술적 특징을 분석하고 각각의 국내외 관련 기술 개발 현황을 제시한다.

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Performance Evaluation of a-Si BIPV System According to Transmittance Variation (투과율에 따른 비정질실리콘 BIPV 시스템 효율 평가)

  • Cha, Kwangseok;Lee, Byoungdoo;Kim, Kangsuk;Shin, Seungchul;Lee, Daewoo
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.60.1-60.1
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    • 2010
  • 공동주택에서 태양광발전(PV)을 통한 세대 전기에너지 이용은 모듈 설치 면적의 제약으로 인해 전 세대를 대상으로 활용하기에 현실적으로 어려움이 있다. 특히 남향이나 남동, 남서향으로 위치한 거실 창호를 활용하는 경우에도 결정질 실리콘(crystalline silicon) 태양전지 셀로 인한 실내 음영문제 등으로 건물통합형 태양광발전(BIPV) 시스템의 가시성을 확보하는데 한계가 있다. 따라서 이런 문제점을 극복하고자 투광형 비정질실리콘(amorphous silicon) 태양전지를 이용한 발코니창호/커튼월 BIPV 시스템을 구축하고, 테스트베드를 통한 적용성 평가 검증을 수행하였다. 테스트베드는 KCC 중앙연구소 1층 외부 측창에 결정질 BIPV 모듈(A2PEAK 사(社), 최대 출력 210 Wp, W 2,000 mm ${\times}$ H 1,066 mm)과 10% 및 30% 투광형 비정질 BIPV 모듈(Sharp 사(社) See Through type, 최대 출력 135 Wp/123 Wp, W 1,930 mm ${\times}$ H 1,180 mm)을 각각 설치(남서 $30^{\circ}$, 수직 $90^{\circ}$)하여, 2009년 5월에서 8월 사이 4개월에 걸친 모니터링을 통해 실제 발전량 데이터를 확보, 시스템에 대한 분석을 진행하였다. 분석 결과, 설치용량당 일평균 발전량은 결정질형이 1.46 kWh/kWp, 10% 투광형은 1.10 kWh/kWp, 30% 투광형은 0.73 kWh/kWp을 나타내었다. 10% 투광형과 30% 투광형의 모듈 성능 차이는 크지 않으나 발전량에 있어서는 큰 차이를 보였고, 10% 투광형의 설치용량당 일평균 발전량은 경정질형의 75.2% 수준으로 투광형 비정질실리콘 BIPV 시스템의 창호 적용 가능성을 확인하였다. 특히 세대 거실 창호를 통한 가시성 확보는 기존 결정질 BIPV 창호의 단점을 개선하였다. 건자재 일체화로 구축된 가시성확보 BIPV시스템 창호는 단위 세대별 적용이 쉽고, 공동주택에서 PV 시스템의 설치면적을 극대화시키므로 향후 Zero Energy 공동주택 구축에도 활용성이 클 것으로 기대된다.

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An Experimental Study on the Temperature Distribution according to the Heat Sink Height of 30W LED Floodlight (30W급 LED 투광등 히트싱크 높이변화에 따른 온도분포에 관한 실험적 연구)

  • Kim, Dae-Un;Chung, Han-Shik;Jeong, Hyo-Min;Yi, Chung-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.5
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    • pp.150-156
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    • 2017
  • This study tests the characteristics of heat radiation by applying the pin-height variables to 30-W LED floodlights. The angle of the heat sink enables us to identify the characteristics of the heat radiation based on the temperature distribution. The results of the study are as follows. When the heat sinks are set towards the ground, the heat transfer decreases in speed only to expands the temperature distribution, which adversely affects the characteristics of heat radiation and expands the temperature distribution of PCB with the LED chip. We verify that the characteristics of heat radiation are adversely affected when the height of the cooling pin decreases and the heat radiation area decreases, which impedes the heat transfer and increases the temperature distribution on the heat sink.

A Study on Heatsink Temperature Distribution according to the Installation Angle of a 30W LED Floodlight (30W급 LED 투광등 설치각도에 따른 히트싱크 온도분포에 관한 연구)

  • Lee, Young Ho;Yi, Chung Seob;Chung, Hanshik
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.8
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    • pp.24-30
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    • 2019
  • This study investigated the heat dissipation characteristics of a heat-sensitive LED. The results of the empirical test showed that the best temperature intensification was found at 90 with 15-fins, and the heatsink installed perpendicular to the direction of the flow of air was directly connected to the air in the largest heat shield area, leading to the best cooling, and the number of fin also resulted increase in the heat discharge area, resulting in the largest cooling action with 15 fins. It was found that the rate of air flow changed in the range of 1.5m/s to 2.5m/s, but only by a deviation of about $2^{\circ}C$ to $3^{\circ}C$ from the current state of 15 fins at 2.5m/s, and the rate of air flow increased, but the performance of the heat release was not significantly increased. As a result wind speed with minimum air flow conditions of 1.5m/s can greatly contribute to the heat dissipation performance.

An Experimental Study on Heatsink Temperature Distribution according to the Wind Speed of a 30W LED Floodlight (30W급 LED 투광등의 풍속에 따른 히트싱크 온도분포에 관한 실험적 연구)

  • Lee, Young Ho;Kim, Dae Un;Chung, Han Shik;Jeong, Hyo Min;Yi, Chung Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.5
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    • pp.96-102
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    • 2019
  • This study investigated the heat dissipation characteristics of a heat-sensitive LED. More than 80% of the power supply is converted into heat energy, which has a fatal impact on the lifetime of the LED. Therefore, the effective heat dissipation characteristics of a heatsink, such as a 30W floodlight, through forced convection were grasped and the heat transfer characteristics were tested. As a result, it was confirmed that the smaller the number of fins, the more the temperature distribution varies according to the wind velocity. In addition, the larger the number of fins, the smaller the temperature difference according to the wind velocity. Therefore, it was found through this experiment that excellent heat dissipation performance was exhibited as the heat dissipation area and wind velocity increased.

A Study on Discrimination of Watercore Apple using Transmitted Light and Effects of various Factors (투과광을 이용한 밀병 사과의 판별 가능성 및 영향인자 조사)

  • 손미령;정경원;조래광
    • Food Science and Preservation
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    • v.7 no.4
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    • pp.357-361
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    • 2000
  • Watercore influences storage and distribution industry of fruit. Therefore, the technique for nondestructive discrimination of watercore fruit is needed. This work reports about the possibility of watercore discrimination of ante using transmitted light, and the effects of various factors. CCD camera was used to capone images of each apple fruit. An excess watercore apples were higher light transmission score than little watercore apples. The accuracy fur discrimination of watercore apple was about 70% using transmitted light. Peel thickness, anthocyanin layer thickness and density of apple affected the light transmission. Apples having thin peel, thin pigment layer and low density tended to high transmitted light score. Apples of good color degree were more probability of existence watercore than ones of bad color degree. But color distribution of apple peel was not correlated with watercore.

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Physiological Responses of the Three Deciduous Hardwood Seedlings Growing Under Different Shade Treatment Regimes (상이한 피음조건에서 자라는 3개 활엽수의 생리적 반응)

  • Kim, Gil-Nam;Cho, Min-Seok;Lee, Soo-Won
    • Journal of Bio-Environment Control
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    • v.19 no.1
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    • pp.36-48
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    • 2010
  • This present study was conducted to investigate photosynthetic characteristics, chlorophyll fluorescence, chlorophyll contents of Betula platyphylla var. japonica, Prunus leveilleana, Magnolia sieboldii, growing under four different light intensity regimes (full sun, and 64~73%, 35~42%, 9~16% of full sun). As result, Betula platyphylla var. japonica showed outstanding photosynthetic capacity and apparent quantum yield in full sun and showed low shade tolerance. Prunus leveilleana showed good photosynthetic capacity and apparent quantum yield in 64~73% or 35~42% of full sun and showed common shade tolerance. However, Magnolia sieboldii showed good photosynthetic capacity and apparent quantum yield in 35~42% of full sun, while the lowest in full sun. Magnolia sieboldii showed the highest shade tolerance compared to the other species. As the shading level increased, the total chlorophyll contents of all species increased with significant difference.

Comparison of Chromaticity coordinate and Dominant wavelength for General R/G/B/W LEDs Light Source (R/G/B 및 백색 LED광원의 색도좌표와 주파장의 비교 고찰)

  • Hwang, Myung-Keun;Cho, Mee-Ryoung;Shin, Sang-Wuk;Lee, Se-Hyun;Lee, Joo-Sung;Jung, Bong-Man
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.166-169
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    • 2007
  • 최근에 정부의 "15/30 LED조명 보급정책"에 힘입어 개발된 8W급 조명용 LED광원의 CIE 색도좌표 (chromaticity coordinate)와 주파장(dominant wavelength)등을 측정 고찰 하였다. 적색(R), 녹색(G), 청색(B), 백색(W)순으로 주파장은 각각 620[nm], 531[nm], 465[nm], 579[nm]이고, 자극순도(excitation purity)는 0.98, 0.82, 0.97, 0.15이며, 휘도순도(colorimetric putity)는 45[%], 16[%], 279[%], 6[%]로 나타났다. Power LED의 최적배치 설계로서, 특히 백색 LED광원의 경우 백열전구(15 lm/W)에 비해 3배 이상의 높은 효율(47.71m/W)을 보였고, 배광측정에서는 78.7%의 효율로 나타났다. 현재 LED광원은 MR16이나 베이스 타입 등의 형태로 제작하여 스탠드, 복도등, 비상유도등, 침실용 등의 용도에 사용되고, 일부는 LED의 원형이나 면(flat)타입으로 가로등이나 투광등으로도 활용되고 있다. 따라서 이들에 대한 각각의 특성들을 제시해 둘 필요성인 인지되어 국내 최초로 개발된 R/G/B/W 8W급 LED광원에 대한 기본적인 광특성 결과를 얻었으며, 이중에서 HB 백색 LED램프의 색도좌표 값을 얻어 CIE표준광과의 색도좌표(x, y) 위치를 비교 검토할 수 가 있었다.

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