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논문 기본 정보

자료유형
학술대회자료
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한국태양에너지학회 한국태양에너지학회 학술대회논문집 한국태양에너지학회 2004 Proceedings ISEA Asia-Pacific
발행연도
2004.10
수록면
979 - 988 (10page)

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This report covers the design, simulation, test, and analysis of a double Venetian blind solar concentration system. The purpose of the solar concentration system is to collect natural sunlight and inject it into a light pipe. A light pipe is a hollow wave guide which uses a prismatic film to reflect light within the waveguide. If the incident light is within a 30 degree angular spread along the axis of the light pipe, then the light will be total internally reflected by the prismatic film and thusly, propagated down the length of the light pipe. However if the incident light is greater than a 30 degree angular spread, it is transmitted through the prismatic film and is emit from the light pipe. The amount of light emit from different sections of the light pipe is controlled by an extractor strip. An extractor strip is made out of a diffusely reflective material, which causes light to be reflected at random angles, most of which is greater than 30 degrees. Therefore, a strategically shaped and placed extractor strip can cause the desired amount of light to be reflected with a greater than 30 degree angular spread, and thusly emit from the light pipe.
The goal was to create a new solar concentration system that was more efficient and cost effective than the previous system. Ideally, the light pipe should output enough light to illuminate a desk below it with 300 LUX (lumens per square meter), the estimated LUX for an average office environment, from 9:30am to 3:30pm on a sunny day.
The old solar concentration system consisted of a large Fresnel lens and a box shaped light transformer, while the new solar concentration system consisted of two sets of Venetian blinds and a cone shaped light transformer. Details of the old and new system will be covered, as well as the design process and reasoning used to create the new solar concentrating system. Computer simulations and tests were also performed. The test data will be compared to the simulated data, as well as compared to the 2003 system ´s data. Lastly, problems with the double Venetian blind solar concentration system will be covered, as well as recommendations for improvement.
Overall, the new double Venetian blind solar concentration system outperformed the previous system in terms of efficiency, uniformity of illumination, simplicity in design, and cost. However, advancements still have to be made before this system will reach a production stage.

목차

Abstract

1. 2003 Solar Collection System

2. 2004 Solar Collection System

3. Simulations

4. Testing

5. Comparing Results

6. Problems and Recommendations

7. Conclusions

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