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지하공간을 위한 태양 굴뚝 시스템의 연간 환기성능 평가
장향인(Jang Hyang-In),정진우(Jeong Jin-Woo),박진서(Park Jin-Seo),서승직(Suh Seung-Jik) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
In company with previous research which analyzed the natural ventilation performance, this study evaluated the annual performance of solar chimney system. A mathematical model of the solar chimney was proposed in order to predict its performance on Korea climate. Steady state heat transfer equations were solved using a inverse matrix method. Numerical simulation program to analyze system was developed by using MATLAB. As the results, 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. 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.
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.
바닥급기방식의 모델링 방법에 따른 실내 열부하 특성 비교
장향인(Hyang-In Jang),서승직 (Seung-Jik Suh) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The purpose of this study is to propose modeling method of Underfloor Air Distribution System(UFAD) with reliability and validity by comparing characteristics of modeling methods. For this, The modeling methods of UFAD were selected by investigating various modeling methods of previous researches. Then, simulations was conducted by using EnergyPlus which is dynamic analysis program of building energy. Annual energy consumption for each method was compared with a wide range of indoor thermal loads. As a result, the methodology of reducing internal gains can cause under sizing of the system. It suggests modeling methods to reflect occupied zone air-conditioning, temperature stratification and supply plenum which are the main characteristics of UFAD.
장향인(Hyang-In Jang),김병구(Byung-Gu Kim),윤태균(Tae-Gyun Yun),서승직(Seung-Jik Suh) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
This study focused on the application of the multipurpose solar chimney system (MSCS) as proposed by a previous study. Furthermore, sizing method for the system were investigated for a feasibility study of the system. This study proposed a simple configuration method in which the designer can calculate on the system size at the preliminary design stage by using system efficiency, coefficient of overall heat transmission, weather data. Consequently, the proposed sizing method and the overall period computation results showed a 7.9% error of assessment.
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.
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.
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.
PMV 제어에 따른 사무소 건물의 실내열환경과 에너지소비량 분석
장향인(Jang Hyang-In),서승직(Suh Seung-Jik) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.4
The purpose of this study is to analyse the effects of air conditioned room controlled by PMV(Predicted Mean Vote)for energy consumption and human comfort in office building. The ‘EnergyPlus’ was used for the evaluation of indoor thermal environment and energy consumption by the controls of room temperature and PMV. The result indicates that the PMV control could prove more profitable method for improvement of indoor thermal environment and energy conservation. Consequently, PMV control has a distinc advantage over most other control methods. An additional study is required to establish the various thermal comfort control for rooms on the basis of this work.
EnergyPlus를 이용한 바닥공조시스템의 모델링 방법에 따른 에너지 성능 비교
장향인(Hyang-In Jang),윤성훈(Seong-Hoon Yoon),이현수(Hyun-Soo Lee),서승직(Seung-Jik Suh) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.10
The purpose of this study is to propose modeling method of Underfloor Air Distribution System with reliability and validity by comparing characteristics of modeling methods. For this, the modeling methods of UFAD were selected by investigating various modeling methods of previous researches. Then, simulations were conducted by using EnergyPlus which is dynamic analysis program of building energy. Annual energy consumption for each method was compared with a wide range of indoor thermal loads. As a result, the methodology of reducing internal gains can cause under sizing of the system. It suggests modeling methods to reflect occupied zone air-conditioning, temperature stratification and supply plenum which are the main characteristics of UFAD.