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장향인,성윤복,조영흠,김용식,조재훈 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.5
This study aims to investigate the usage of the renewable energy systems installed in buildings and make suggestions for the effective management. In this regard, a questionnaire survey was conducted on 1)design and construction, 2) operation and management, 3) user satisfaction and improvements about the renewable energy systems in buildings. Findings from this study can be summarized as follows; a lack of the basic information about systems, non-use of energy management systems, the differences in the features by energy source, and alack of expertise of managers. The requirements to resolved these problems include the integrated management of various electric heat sources including a renewable energy source, an operation schedule based on the prediction of production and consumption, and so on. Furthermore the necessity of multiplex energy sources management system was confirmed and the basic data needed to establish the targets of this system were obtained.
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.
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.
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),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.
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.