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학교교실 천정매입형 히트펌프의 최적 토출각도 선정에 관한 연구
이정재(Jurng Jae Yee),이미화(Mi Hwa Lee),김종훈(Jong Hun Kim) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.1
In school, an improvement on thermal environment which can develop students" abilities and can enhance teacher"s efficiency is an important factor. Recently, some schools installed an air conditioner in classroom, while most schools selected the built-in type air conditioner. However, the study on a valuation of thermal environment is not sufficient, especially in classroom. It is insufficient that the study is a valuation of thermal environment which considered valuation about indoor thermal environment diffusion angle and air volume. In this work, the change of thermal environment was investigated for five kinds of air diffusion angle(15°, 30°, 45°, 60°, 90°) for ceiling type air conditioner. The vector and temperature distributions of air in the room were calculated by a 3-dimensional numerical method. This study was also conducted to calculate the Mean Age of Air and Predicted Mean Vote(PMV). This analysis showed that 30-45° is the optimum angle of diffusion in cooling mode and in heating mode.
공동주택 전열교환 환기시스템의 에너지 절약적 외기도입 운전제어 방안에 관한 연구
이정재(Yee Jurng-Jae),김석근(Kim Seok-Keun) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.6
Recently, the ventilation system is required by law to satisfy minimum fresh air requirements, but this, in turn, inevitably forces the ventilation system itself to consume extra energy. Thus, there is an increasing need for an adequate control method for supplying outdoor air, which minimizes energy consumption while insuring that indoor air quality is efficiently maintained. Therefore, this study, it will propose a proper outdoor air supply control method in order to minimize energy consumption while effectively preserving IAQ. Results of this study are as follows : (1) It is necessary to avoid operating constant heat-exchange-mode throughout the year, which is common in apartment nowadays, and to switch to bypass-mode, depending on the condition of indoor and outdoor air, for energy conservational outdoor air supply in the ventilation system of apartments. It is also proved that outside air supply control should be determined by the dry bulb temperature instead of enthalpy, in order to be energy-efficient in apartments because apartments are usually not introducing an extra latent heat control method. (2) From the result of energy performance simulations for the heating & cooling loads used to propose a proper operating control method of the heat exchange ventilation system, it was found that using heat-exchange-mode by schedule control method in heating season and using bypass-mode by temperature sensor both in intermediate season and cooling season provided the largest energy savings. (3) The result also showed that adopting this method in weather conditions in Seoul city saved 16.4% of energy compared to the preexistent annual heat-exchange-mode.
부산광역시 공동주택의 외피구조에 따른 에너지 소비특성 분석
이정재(Yee Jurng-Jae),김환용(Kim Hwan-Yong),김승희(Kim Seung-Hee) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.4
In this paper we made energy consumption units of glass curtain wall type apartment and general apartment in Busan metropolitan city and compared energy consumption characteristics by building envelope. The monthly electricity consumption units of general apartment were shown in the range of 1.16~1.51kWh/m<SUP>2</SUP>·mon which were indicated higher value in January, February, August and September with little variation. On the other hand, in case of glass curtain wall type apartment, monthly electricity consumption units were represented in the range of 1.91~7.07kWh/m<SUP>2</SUP>·mon with significant fluctuations monthly, which were outstandingly high in July, August and September. The monthly city gas consumption units of general apartment were found to be in the range of 1.79~18.07MJ/m<SUP>2</SUP>·mon, while glass curtain wall type apartment were with in 0.94~ 19.91MJ/m<SUP>2</SUP>·mon. City gas consumption units from December to March were shown highly in both type apartments. The monthly energy consumption units of general apartment were found to be within 14.23~30.69MJ/m<SUP>2</SUP>·mon, while glass curtain wall type apartment were within 24.49~68.9MJ/m<SUP>2</SUP>·mon. Energy consumption units of glass curtain wall type apartment were suggested 4.84 times higher than those of general apartment.