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조명해석 프로그램을 이용한 광선반의 채광성능분석에 관한 연구
조일식(Cho Yil Sik),김병수(Kim Byoung Soo) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
The purpose of this paper is to make an optimum guideline of a light shelf suitable for the domestic situation, this study is worked by experiments using a light shelf and analysis of variables(light self length, reflectance, angle of a light shelf and domestic position) using illumination program(Lightscape). The result of this study is summarized as follows. 1) Concerning the presence of a light shelf itself, the ratio of the maximum to the minimum inner illuminance and the proportion of inner daylight decrease 3.5 times as much as that, whereas a distribution of inner illuminance is uniformed 2) Concerning the Sky conditions, the a light shelf has little effect on the light in the overcast sky, whereas it has an effect on the light in the partial overcast sky with the over 45,000lux and in the clear sky with the over 75,000lux. Especially, in the partial overcast, a light shelf was in the highest of efficiency. 3) Concerning the degree of angle of the a light shelf, there is no change under 10 degree from the horizon, whereas the uniformity ratio of inner illuminance and the proportion of inner daylight increase respectively 48% and 29% between 20 and 30 degree. The latter condition is proved to be better for an uniformed distribution of inner illuminance and a more effective lighting. 4) Concerning the proportion of reflectance of a light shelf, 10% of increase each ranging from 60% to 90% is proved to have no effect on the increase of light. 5)The inner and outer optimum size of a light shelf is proved to be over 200㎜ and 600㎜ respectively, which makes it possible to make a general formula adaptable to all parts of our country.
Eco-Village 구현을 위한 신재생에너지 기술의 적용
조일식(Cho, Yil-Sik),한수빈(Han, Soo-Bin),임상훈(Lim, Sang-Hoon),오승진(Oh, Seung-Jin),오원종(Oh, Won-Jong) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
본 논문은 신재생에너지 적용 건축공학적 접근을 통한 Eco-Village의 쾌적한 환경을 실현하면서 에너지와 자원의 소비를 억제하고 환경에 대한 부하를 최소화하는 Village 개발을 목표로 하고 있다. 다시 말해서 건축공학적 접근을 통한 Eco-Village의 최종목표는 적극적인 에너지 절약 기술의 도입과 태양열, 태양광, 풍력, 바이오 에너지 등 자연에너지의 적용을 통해 지구온난화 가스를 배출하는 화석연료의 소비를 억제함과 동시에 자연친화적인 Eco-Village를 개발하는 것이다.
조일식(Cho Yil-sik),L. Bulat,황우성(Whang Uoo-Sung),양윤섭(Yang Yoon-Sub) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
In Compound Parabolic Concentration(CPC) solar collectors heat transfer as convective and radiative heat losses are comparable. Radiative losses can be reduced by selective absorber coatings, but this will not improve the performance greatly unless convection losses are reduced at the same time. The proposed optical design would provide high efficiency comparable to a vacuum collector, since the design is constructed to suppress convection losses by placing the absorber facing downward, instead of facing up to the sky. The optical design of CPC is modified to provide a relatively uniform distribution of the concentrated radiation flux through the optics on the absorber surface that will enhance the thermal efficiency. Various absorber designs are suggested for efficient applications that lead to a selection of appropriate operating temperature ranges.
조일식(Cho Yil-Sik),김병수(Kim Byoung-Soo) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.3
The aim of this study was to analysis the Heating/cooling performance of Solar Window System built in apartments. The solar window is the idea to integrate daylight as a third form of solar energy into a PV/Solar Collector system and allows more control due to the possibility to close the reflectors. However, there can be a conflict between the desire for on one hand daylight and view and on the other hand optimal energy conversion for the PV/Solar Collector system. The process of this study is as follows: 1) The Solar Window system is designed through the investigation of previous paper and work. 2)The simulation program(ESP-r, Therm5.0, Window6.0) was used in energy performance analysis. The reference model of simulation was made up to analysis energy performance on Solar Window system. 3)Selected reference model(Floors:15, Area of Unit:148.5㎡) for heating/cooling energy analysis, Energy performance simulation with various variants, such as U-value of Solar Window system according to its position and angle. Consequently, When Solar Window system is equipped with balcony window of Apartment, Annual heating and cooling energy of reference model was cut down about 5%~11%.
황우성(Whang Uoo Sung),조일식(Cho Yil Sik),양윤섭(Yang Yoon Sub) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
In CPC solar collectors convective and radiative heat losses are comparable. Radiative losses can be reduced by selective absorber coatings, but this will not improve the performance greatly unless convection losses are reduced at the same time. The proposed optical design would provide high efficiency comparable to a vacuum collector, since the design is constructed to suppress convection losses by placing the absorber facing downward, instead of facing up to the sky. The optical design of CPC is modified to provide a relatively uniform distribution of the concentrated radiation flux through the optics on the absorber surface that will enhance the thermal efficiency. Various absorber designs are suggested for efficient applications that lead to a selection of appropriate operating temperature ranges.
오승진(Oh Seung Jin),조일식(Cho Yil-Sik),이윤준(Lee Yoon Joon),천원기(Chun Wongee) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
There have been many solar tracking systems developed for the high accuracy in solar tracking. One of the key components of any motion control system is software. LabVIEW offers an ideal combination of flexibility ,ease-of-use and well-integration with other I/O pieces for developing solar tracking system. Real-time solar positions which vary with GPS’s data are used simultaneously to control the solar tracker by a chain of operating modes between the open and closed loops. This paper introduces a step by step procedure for the fabrication and performance assessment of a precision solar tracking system. The system developed in this study consists of motion controllers, motor drives, step-motors, feedback devices and application. CRD sensors are applied for the solar tracking system which play a primary role in poor conditions for tracking due to a gear backlash and a strong wind. Mini-dish was used as a concentrator for collecting sun light. The solar position data , in terms of azimuth and elevation, sunrise and sunset times was compared with those of KASI(Korea Astronomy & Space Science Institute). The results presented in this paper demonstrate the accuracy of the present system in solar tracking and utilization.
주광제어 장치를 이용한 건물의 에너지 절약(이론 및 실제)
한현주(Hyun-Joo Han),조일식(Yil-Sik Cho),송인춘(In-Choon Song) 한국태양에너지학회 1990 한국태양에너지학회 논문집 Vol.10 No.2
본 조사에서는 자연광 (일광, 혹은 주광 : sunlight)을 도입하는데 있어 현휘(glare)나 강한 휘도군을 지양하고 하절기의 과열을 방지하여 쾌적한 생활환경을 조성하는데 유용한 주광 제어 장치들의 종류와 특성에 대해 간략히 알아보고 이를 적용한 외국의 실제 예를 소개하였다. 특히, 미국 Utah주 Salt Lake City에 위치한 Johnson Controls사의 지사 건물은 자연채광의 한 방편으로 light shelf와 고창을 이용하여 에너지 절약과 실내 빛 환경의 개선을 도모한 좋은 표본이라 하겠다. 에너지 자원을 거의 수입에 의존하고 있는 우리의 실정을 감안한다면 우리도 이 분야에 대한 다각적인 검토와 연구가 이루어져 건물에너지의 절약을 꾀하여야 할 것이다. In the present analysis, a number of sun control devices are examined for their performance in promoting the interior visual environment. Two exemplary cases are introduced for their excellence in harnessing the concept of daylighting and passive concepts. Of these, the Johnson Controls branch office building in Salt Lake City manifests the effectiveness of light shelves and clerestory windows in implementing these concepts. Distinct optical characteristics are found for overhangs, light shelves, louvers, and blinds as they interfere with the path of sunlight. Substantial amount of energy could be saved if the fundamentals of these devices are truly understood in their application to residential and commercial buildings. Sustained efforts should be made in this regard by the builders, architects, energy consultants, and educators who make contributions in energy management.