창호 크기와 성능이 열관류율에 미치는 영향에 대한 연구

장향인(Jang Hyang-In),최원기(Choi Won-Ki),최경석(Choi Gyeong-Seok),엄재용(Eom Jae-yong),이현수(Lee Hyun-Soo),서승직(Suh Seung-Jik) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.1

Windows of the buildings will be installed in a variety of sizes and shapes, but 2m × 2m sized windows(specimen) are evaluating U value by the KS F 2278, so there is a difference between windows that are applied to the actual building and specimen. In this paper, it is evaluated on U value by the effects of changes in size of windows, correlation was derived. The following conclusions were derived. 1) Depending on the type of spacer average U value difference is approximately 0.06 W/㎡·K. 2) 0.005 W/m·K increase in linear U value, U value is increased approximately 0.0094 W/㎡·K. 3) In the same conditions of the frame, as excellent U value of glazing, U value of windows bigger changes according to the window size changes. Later, the U value change analysis according to the size will be performed for various types of windows in order to provide a reasonable calculation criteria, so additional studies should be performed.

태양굴뚝의 자연환기시스템 설계인자에 관한 연구

장향인(Jang Hyang-In),서승직(Suh Seung-Jik) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6

This study analyzed the design factors of natural ventilation system in solar chimney. A mathematical model of the solar chimney was proposed in order to predict its ventilation performance for various design factors(stack height, stack width, distance between absorber wall and glass, ratio of a cross sectional area, etc.). Steady state heat transfer equations were set up using a energy balanced equations and solved using a inverse matrix method. Numerical simulation program to analyze system was developed by using MATLAB. In case that the height and distance of the system are changed in the same interval, increasing amount of ventilation was larger about 22 times by distance than height. Also, while design factors like the width, height and distance are changed in limited volume, the contribution to the ventilation performance shows the sequence of the width, distance and height in most of the range. In addition, ventilation rate difference of 15% happened by the cross-area ratio. Through this study, performance comparison of solar chimney system for various design factors was fulfilled by numerical method. Further, experimental study is required to verify numerical simulation.

지하공간의 자연환기를 위한 태양 굴뚝 시스템의 응용

장향인(Jang Hyang-In),서승직(Suh Seung-Jik) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.2

This study analyzed the performance of solar chimney system for natural ventilation in underground space. A mathematical model of the solar chimney was proposed in order to predict its performance under varying parameters and Korea climatic condition. Steady state heat transfer equations were set up using a energy balanced equations and solved using a inverse matrix method. Numerical simulation program to analyze system was developed by using MATLAB. As the results, the ventilation performance of the solar chimney was determined by the temperature difference of air channel and inlet, and the temperature difference was influenced by insolation, stack height and distance of air gab. Also the solar chimney system can provide 262.9㎥/h of annual average ventilation rate. Because seasonal differences of ventilation rate was calculated within 25%, the solar chimney system can be used for every season in Korea climatic condition. Through this study, performance of solar chimney system for natural ventilation was verified by numerical method. Consequently, the solar chimney system is proved to be effective device for natural ventilation utilizing at all times, and the additional studies should be made through the experimental method for imagineering and commercialization.

ISO 10211 전열해석을 통한 경량목구조의 주요 구조부 단열성능 데이터베이스 구축

장향인(Jang, Hyang-In),유동철(Yoo, Dong-Chul),안형준(Ahn, Hyung-June),오향옥(Oh, Hyang-Ok),조대구(Cho, Dea-Gu) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.4

This study aimed to establish a thermal performance database for various lightweight wood-frame house envelopes in order to increase the accuracy of insulation assessment and energy performance analysis for lightweight wood-frame buildings. The differences in energy and insulation performances were analyzed based on the thermal transmittance calculation method for composite walls. The linear thermal transmittance (Ψ), equivalent thermal transmittance (Ueq), and thermal conductivity of various composite walls for lightweight wood-frame houses were calculated. PHYSIBEL Trisco V.12 was used for the heat transfer analysis, and DesignBuilder V.3.4 was used for the energy performance analysis. The thermal transmittance in the case studies was compared with the heat transfer analysis, and the results confirmed a difference of 3.8%?22.7% for the thermal transmittance and a difference of 3.2%?12.1% for the heating energy. When heat transfer analysis was conducted for various configurations of the lightweight wood-frame house such as the stud spacing, stud thickness, stud placement, and presence of an airtight layer, the results showed a linear thermal transmittance (ψ) difference that was approximately 4.8 times depending on the wall configuration. The thermal conductivity (λ) of the inversion stud and insulation layer was 0.0433?0.0492 W/m·K, indicating a maximum of 11.9% on the stud interval of 406 mm (16 in) and 0.0404?0.0452 W/m·K indicating a maximum of 10.6% on the interval of 610 mm(24 in). With the database established in this study, the thermal performance of the composite walls in lightweight wood-frame houses can be calculated without a complex heat transfer analysis and can be used as basic data for the construction of eco-friendly low-energy wooden structures.

창세트 시뮬레이션 시험법에 따른 부위별 열관류율 비교

장향인(Jang Hyang-In),안형준(Ann Hyung-June),강혜숙(Kang, Hye-Suk),최창호(Choi, Chang-Ho),서승직(Suh, Seung-Jik) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.5

The purpose of this study was to calculate U-values and compare quantitative difference based on the assessment methods and input criteria using domestic and international test method to confirm the feasibility of the simulation test of domestic window–set U-values. To that end, the standards of the tests of U-values of domestic and international window sets were discussed and a variety of cases where window set configuration parameters (glass, cavity gas and thickness, frames, spacers, windows sizes) have been changed were simulated using WINDOW&THERM to calculate U-values. The results of U-value Differences against domestic standards by window set portion (glazing, frame, edge) found that differences of NFRC were high in the order of edge > glazing > frame in all the standards. The analysis of U-values by changing the cavity gas and thickness of the window glass having a great impact on a total of U-values in window revealed that differences were high in the order of Krypton > Argon > Air, leading to higher differences of NFRC, compared to those of NFRC. This is explained by the fact that even though convective heat transfer coefficient calculation is the same, the difference of volume expansion coefficient(β) and temperature of the Rayleigh’s number(Ra) formula increases as the difference between indoor and outdoor temperatures of NFRC is 19°C or higher. In addition, an inflection point appeared, where the difference rapidly increases in certain thickness, regardless of types and standards of the cavity gas. It may have been caused by the threshold where convection is activated influenced by cube(d3). The above study attempted to analyze the trends and causes of segmental U-values according to a window set simulation. Additionally, further research will be carried out on various types of window sets in future.

지하공간의 환기를 위한 태양 굴뚝 시스템의 성능 분석

장향인(Jang Hyang-In),박진서(Park Jin-Seo),정진우(Jeong Jin-Woo),서승직(Suh Seung-Jik) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4

This study analyzed the performance of solar chimney system for natural ventilation in underground spaces. A mathematical model of the solar chimney was proposed in order to predict its performance under varying parameters(insolation, stack height, distance between absorber wall and glass, ratio of a cross sectional area, etc.). Steady state heat transfer equations were set up using a energy balanced equations and solved using a inverse matrix method. Numerical simulation program to analyze system was developed by using MA TLAB. The ventilation performance of the solar chimney was determined by the temperature difference of air channel and inlet, and the temperature difference rose according to increasing insolation, height and distance. In addition, ventilation rate difference of 15% happened by the cross-area ratio. Through this study, performance comparison of solar chimney system for natural ventilation was fulfilled by numerical method. Further, experimental study is required to verify numerical simulation.

PMV 제어에 따른 VAV시스템의 실내온열환경 및 에너지소비 특성 비교

장향인(Hyang-In Jang),곽희정(Hee-Jeong Kwak),서승직(Seung-Jik Suh) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11

The purpose of this work is to analyze the effects of air-conditioning zone control using thermal comfort index and thereby reduce energy and increase the comfort of residents. This researcher used EnergyPlus to compare indoor thermal environment and energy consumption by temperature control and PMV control. According to the comparison analysis, thermal comfort percentage in PMV control was considerably higher than that in the temperature control. And, the energy consumption in PMV control was smaller that in temperature control (22.5 to 24.5℃) so that an air-conditioning zone was found to be very effectively controlled. Like this, this work proved the effects of the control by the use of thermal comfort index. In the future, studies on thermal comfort control for various systems will be conducted.

공공건물의 신재생에너지시스템 설치의무화에 따른 BIPV 시스템 모듈 현황 분석

엄재용(Eom, Jae-Yong),장향인(Jang, Hyang-In),윤성훈(Yoon, Seong-Hoon) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.4

The purpose of this study is to deduct BIPV system installation current status and characteristics of BIPV module size and output through case analysis of building integrated photovoltaic systems applied in public buildings by new & renewable energy installation obligation system from 2007 to 2012 and present BIPV system supply performance improvement plan. Analysis by year, capacity, subject organization, facility categorization of BIPV system and size, output by unit area of BIPV module was analyzed. The analyzed results are as follows. (1) BIPV system was installed in 71 locations of 2.7MW from 2007 to 2012 and frequency by BIPV system installation capacity range was highest in 10kW∼20kW with 31%. Also, it was most applied in public work facilities with 33.8% and next was education·society educational institutes with 26.8%. (2) BIPV module was most installed in building facades instead of curtain walls in which form was G-to-G double-glaing type and G-to-T type with proportion of 38% each. (3) BIPV module size was all under 2㎡ and most size was 1.0∼1.5㎡. This size is scarce to replace building material with BIPV module. Therefore, research development on large-scale BIPV module is required. (4) BIPV module output by unit area was most frequent in 100∼125W/㎡. Based on these results, it is thought that 9∼10㎡ installation area is required to install 1 kW BIPV system. Also, high-efficiency of BIPV module is required to install BIPV system of more capacity in limited area.

건축물에너지효율등급 인증 현황 분석을 통한 제로에너지건축물의 설계 영향인자 분석

김진호(Kim, Jin-Ho),조수영(Jo, Su-Young),김창민(Kim, Chang-Min),장향인(Jang, Hyang-In),김선숙(Kim, Sun-Sook) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.4

To achieve the reduction target of GHG emission from the building sector, the government introduced the Zero Energy Building certification system in 2017 according to the Green Building Promotion Act, and established the roadmap for the expansion of the obligation to private buildings in 2025. With the expansion of obligatory buildings, it is necessary to find the affecting factors for certification and data about quantified performance levels. However, in the early times of the system, there were not many certified buildings. Therefore, this study tried to analyze the performance levels of the educational research facilities which had more than grade 1 in the latest 2 years in Building Energy Efficiency Rating as one of Zero Energy Building certification standards, and to suggest the influencing factors on zero energy building design and quantified performance levels. In a statistical analysis method, this study determined the affecting factors on energy requirement, and analyzed the actually certified buildings in order to find grade-based performance levels of the certified in building energy efficiency rating. According to the multiple regression analysis on the affecting factors on design, a coefficient of determination was 0.778 which was significant. Regarding most influencing factors on design, the higher grade, the better performance.

채광성능 개선 및 장거리 자연광 전송을 위한 광덕트 전송부 개발

장향인(Hyang-In Jang),이행우(Henagwoo Lee) 한국태양에너지학회 2019 한국태양에너지학회 학술대회논문집 Vol.2019 No.4