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태양열취득계수(SHGC)에 의한 가시성 및 에너지 성능에 따른 거주자 선호도 상관관계 분석
서혜수(Suh, Hye-Soo),강은율(Kang, Eon-Yul),김병선(Kim, Byung-Seon) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.10
Quantitative expansion of Apartment houses in recent years, coming together with the increased attention on quality of life such as view, indoor air quality and sunshine is spreading. Increased desire for view, sunshine in housing demands the increase of the window area, which causes the increase of cooling load in summer and heating load in winter. 21% of energy consumption in Korea in the building sector are being used, the government strengthen the windows" U-value standards for energy savings. However the recent surge in high-rise apartment house air conditioning in summer causes the increase of cooling load and SHGC should be considered to save energy in addition to U-value. A lower SHGC will reduce the solar load but affect residents" satisfaction of the visibility, so the appropriate SHGC while meeting the visibility of the residents is a need to apply. Therefore the purpose of this study is to analyze the relationship between SHGC and residents" preferences by survey and to present guidelines.
정지태(Jung Jitae),이건호(Lee Keon-Ho),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.10
Recently, the energy efficiency of buildings has become a big issue and the need of thermal performance analysis on transparent building envelopes has been substantially increasing since the energy consumption caused by heat gain or heat loss through transparent building envelopes is significant. The Solar Heat Gain Coefficient(SHGC) is one of the most widely used indicators for thermal performance of transparent building envelopes. The SHGC can be assessed by two methods: The first method is a spectroscopic method which is normally used to evaluate the SHGC of glazing units. This method may be suitable for glazing-only units but it is not easy to track all the spectrums that are transmitted, reflected, or absorbed by the complex fenestrations which contain shading devices because their non-coplanar shapes and irregularities in surfaces produce angular scattering effects. For this reason, NFRC is assessing the SHGC for complex fenestrations with the second method, calorimetric method. In this paper, published standards and methods on assessment of the SHGC are investigated. In addition, the characteristics of an alternative that relieve the difficulties recognized on those standards and methods are provided.
시뮬레이션을 이용한 외부 베네시안 블라인드의 약식 SHGC 계산법 개발
엄재용(Eom Jae-Yong),이충국(Lee Chung-Kook),장월상(Jang Weol-Sang),최원기(Choi Won-Ki) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.2
When it comes to these buildings for business use, cooling load during summertime was reported to have great importance which, as a result, impressively increased interest in Solar Heat Gain Coefficient (SHGC) is considered to be lowered with the help of colors and functions of glass itself, internal shading devices, insulation films and others but basically, these external shading devices for initial blocking that would not allow solar to heat to come in from outside the buildings are determined to be most effective. Of many different external shading devices, this thesis conducted an analysis on Exterior Venetian Blind. As for vertical shading devices, previous researches already calculated SHGC conveniently using concepts of sky-opening ratios. However in terms of the Venetian Blind, such correlation is not possibly applied. In light of that, in order to extract a valid correlation, this study first introduced a concept called shape factor, which would use the breadth and a space of a shade, before carrying out the analysis. As a consequence, the concept helped this study to find a very similar correlation. Results of the analysis are summarized as follows. ① Regarding SHGC depending on the surface reflectance of a shade, an average of 2% error is observed and yet, the figure can always be ignored when it comes to a simple calculation. ② As for SHGC of each bearing, this study noticed deviations of 4% or less and in the end, it is confirmed that extraction can be achieved with no more than one correlation formula. ③ When only the shape factor and nothing else is used for finding a correlation formula, the formula with a deviation of approximately 5% or less is what one would expect. ④ Since the study observed slight differences in bearing depending on ranges of the shape factors, it needed to extract a weighted value of each bearing, and learned that the smaller the shape factor, the wider the range of a weighted value. The study now suggests that a follow-up research to extract a simple calculation formula by dealing with all these various inclined angles of shade, solar radiation conditions of each region (the ratio of diffuse radiation to direct radiation and others) as well as seasonal features should be carried out.
정지태(Jung Jitae),이건호(Lee Keon-Ho),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.3
The building energy consumption and heat loss/gain caused by building envelopes are closely related to each other. Accordingly, thermal performance for building envelope needs to be assessed in a precise and objective manner. As a quantitative indicator for thermal performance of transparent building envelopes, the Solar Heat Gain Coefficient (SHGC) or g-value is widely accepted. The SI-lGC is generally derived by spectrometric method and calorimetric method. From Ute authors' previous research. the latter was found to be more appropriate for assessing complex fenestrations. With this in mind, the authors had conducted a series of calorimetric experiment using Artificial Solar Laboratory installed in Korea Institute of Construction Technology. Then the SHGCs of tested fenestration cases were calculated with the results from measurement and simulation. In this paper, the outcomes of measurement and simulation are compared. Additionally, factors that may cause differences between measurement and simulation are discussed. Furthermore, the means to diminish the difference and processes to enhance the reliability of the results are suggested.
최적화 기법을 활용한 공동주택 최적 창호성능 평가에 관한 연구
신재윤,이명희,김영주,채영태 대한건축학회지회연합회 2017 대한건축학회연합논문집 Vol.19 No.6
Current Energy Efficiency Rating System focused on thermal performance and air tightness rather considering complex performance such as optical properties or the ventilation frequency. Insufficient evaluation values are limited to evaluate window performance precisely so that additional values should be considered to enhance window performance and reduce building energy consumption as a consequence. In this study, SHGC and mid-term ventilation frequency have been selected for the additional values and then proposed window’s optimized performance index by optimization procedure. In optimization, the direct search method Hooke&Jeeves algorithm which efficient for searching extremum has been used. As a result, the optimized model have shown energy saving 11% in central area and 15% in southern area.