• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.80-84
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• 1999

Sunlight Collector System is a new way to make sunlight available to living things. It transmits sunlight through fiber optics to wherever is needs. It applies the artificial lighting, underground lighting, intelligent building, museum lighting, restoration-room to health etc. Cutting out most of the ultra-violet and intra-red radiation. In this paper, we measured the spectrum analysis of sunlight and Sunlight collector System's light. Also, we found out the distance to get visible light.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.4
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• pp.1-6
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• 2001

In this paper, it is analysed the spectrum of optical fiber output through the sunlight collector system. As the result of the analysis, the sunlight collector system's UV distribution is lower then the sunlight'UV distribution. Also, the lighting environments under the optical fiber bundles are predicted when applied to the minimum workroom's(6${\times}$6${\times}$2.3[m]) interior lighting by using a lighting design program. In case of optical filer output\`s hight of 1.3[m], the illuminance value over 500[lx] in the area 50${\times}$50[cm] was achieved. As the result its feasibility as an interior lighting source shows no serious problem except the system cost.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.245-245
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• 2007

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.2162-2164
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• 2000

In this paper, it is analysed the spectrum of optical fiber output through a sunlight collector system. Also the lighting environments under the optical fiber bundles are predicted when applied to interior lighting by using a simulation program. As the result its feasibility as an interior lighting source shows any serious problem except the system cost.

• Journal of the Korean Solar Energy Society
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• v.33 no.1
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• pp.89-95
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• 2013

A DBLP(Double blind light pipe) daylight system can be installed at a building exterior wall or roof to replace artificial light during the day time. This system was consisted of a double blind light collector, a mirror duct type light transformer and a prism light pipe distributor. The double blinds were used to track the sun's altitude and azimuth movements to collect the sunlight throughout the day. The sunlight collected by the light collector was reflected on the first mirror and the second mirror and sent to the light pipe through the light transformer. The transformer was designed to deliver the sunlight into the light pipe efficiently. The light distributor plays a role in diffusing the sunlight coming in through the light collector to be used for indoor lighting. In this paper, a DBLP system has been designed, installed and tested at a KIER daylighting twin test cell. The DBLP daylighting system was applied to the experimental test cell which has an indoor area of 2.0 m wide ${\times}$ 2.4 m height ${\times}$ 3.8 m length. The experiment was conducted from January 30 to February 27, 2012, under clear skies and partially cloudy skies. Data was collected from 10:00 am to 16:00 pm every 2 minute and the average was calculated for every 30 minute of the data collection to obtain the system efficiency. The results indicated that the DBLP system efficiency was evaluated as 11.67%. The DBLP system indoor illumination energy reduction was predicted as 0.822 kWh/day. This could replace 4 sets of a 32W fluorescent lamp operating 6.4 hours per a day.

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.221-225
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• 2009

A solar thermal collector is a solar collector specifically intended to collect heat: that is, to absorb sunlight to provide heat. A flat plate is the most common type of solar thermal collector, and is usually used as a solar hot water panel to generate solar hot water. A flat plate collector consists basically of an insulated metal box with a glass or a plastic cover and a dark-colored copper absorber plate. Solar radiation is absorbed by the copper absorber plate and transferred to water that circulates through the collector in copper tubes. Ultrasonic welding is an industrial technique whereby high-frequency ultrasonic acoustic vibrations are locally applied to work pieces being held together under pressure to create a solid-state weld. In this study, we developed solar collector ultrasonic welding machine with digital controlled power supply and tested various welding conditions such as welding pressure, welding amplitude, welding speed. Welding speed was considered in 2~12m/min. The width of ultrasonic welds was increased with welding amplitude by 2.2~2.5mm. The fracture load of ultrasonic welds showed 20% higher than domestic products.

• Journal of the Korean Solar Energy Society
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• v.22 no.4
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• pp.10-17
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• 2002

This study aims to develop the analysis tool that assesses the sunlight at any given point of a window or solar collector array shaded by surrounding obstacles. The development of this software, named SunChart, focused to the user-friendliness and the reliability. This SunChart can calculate the solar radiation as well as shading on the certain face. The calculation results by SunChart show by both numerically and graphically and are in a good agreement with ones obtained from "Sunrise Sunset" developed at Korea Astronomy Observatory and from TRNSYS.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.10
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• pp.33-40
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• 2008

• Journal of the Optical Society of Korea
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• v.20 no.4
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• pp.488-499
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• 2016

We present a design and optical simulation of a cost-effective hybrid daylighting/LED system composed of mixing sunlight and light-emitting diode (LED) illumination powered by renewable solar energy for indoor lighting. In this approach, the sunlight collected by the concentrator is split into visible and non-visible rays by a beam splitter. The proposed sunlight collector consists of a Fresnel lens array. The non-visible rays are absorbed by the solar photovoltaic devices to provide electrical power for the LEDs. The visible rays passing through the beam splitters are coupled to a stepped thickness waveguide (STW) by tilted mirrors and confined by total internal reflection (TIR). LEDs are integrated at the end of the STW to improve the lighting quality. LEDs’ light and sunlight are mixed in the waveguide and they are coupled into an optical fiber bundle for indoor illumination. An optical sensor and lighting control system are used to control the LED light flow to ensure that the total output flux for indoor lighting is a fixed value when the sunlight is inadequate. The daylighting capacity was modeled and simulated with a commercial ray tracing software (Lighttools^TM). Results show that the system can achieve 63.8% optical efficiency at geometrical concentration ratio of 630. A required accuracy of sun tracking system achieved more than ±0.5^o . Therefore, our results provide an important breakthrough for the commercialization of large scale optical fiber daylighting systems that are faced with challenges related to high costs.

• Journal of Environmental Impact Assessment
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• v.16 no.3
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• pp.195-206
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• 2007

The purpose of this research is to seek solutions in reducing shadow effects of construction projects on neighboring areas and as its result, we have yielded methods as below to mitigate shadow effects. To eliminate shadow effects fundamentally, revising building layouts to eliminate shadow effects by obtain construction site as much as two point two times of its height. But it will cause multiple problems such as economic inefficiency due to lack of construction sites as well as small sites that are often located in zones that are mixed with highly dense commercial and residential areas along with plan more parks on northern part of the construction site. Therefore, it is recommended to proceed Environmental affect evaluation for shadow effects and gain its residents permission prior to construction or revising building layout. In the other hand, the sunlight collector, which is one of the newly developed recycled energy, has been proven to improve illumination expected to become a reliable solution when dealing with shadow issue in and around high density residential areas.