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RISS 인기검색어
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- 저자 : 장재동(Jae D. Chang) (검색결과 3 건)
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고명진(Myeong-Jin Ko),최두성(Doo-Sung Choi),장재동(Jae D Chang),김용식(Yong-Shik Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.12
This study examined the economics of a solar water heating system for an office building using life cycle cost (LCC) optimization simulations. The numerical simulations were conducted with TRNSYS and GenOpt employing the Hooke-Jeeves algorithm. The solar collector area, slope, mass flow rate per collector area and storage tank volume were selected as the main design parameters of the solar water heating system. The LCC optimization simulations of the system were carried out for cases where water temperature was 60℃ and 50℃. The results showed that for water temperature at 60℃ and 50℃ the collector area could be decreased by 17% and 28%, storage tank volume could be decreased by 49% and 54%, and mass flow rate per collector area increased by 5% and 9% respectively compared to a non-optimized system. The LCC of the system was reduced by 4% for 60℃ and 7% for 50℃. The initial installation cost of the system was reduced by 24% for 60℃ and 34% for 50℃. However, the operating cost of the system increased by 16% for 60℃ and 36% for 50℃ compared to a traditional solar water heating system.
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윤대일(Dae-Il Yoon),고명진(Myeong-Jin Ko),장재동(Jae D. Chang),김용식(Yong-Shik Kim) 한국생활환경학회 2014 한국생활환경학회지 Vol.21 No.3
The university"s energy consumption has been increasing continuously in South Korea. And also, the newly constructed buildings at universities are constantly increasing. The purpose of this study is to survey and analyse the present condition of energy consumption in newly built university campus. In order to carry out the research, newly built university campus located in Incheon, South Korea was selected. Investigation items were building and facility system, system operating conditions, energy consumption of March 2010 to February 2011. The investigation were conducted by data collection and visiting interviews with staff. The results can be summarized as follows. The electric power consumption and thermal consumption at the newly built university campus are greatly affected by heating & cooling periods and system operating condition. In order to reduce energy consumption, response is required by considering the seasonal and daily characteristics of the building"s energy consumption. The total energy consumption of the university campus was 6,310 TOE and the share of it was 65% of electric power, 33% of heat and 2% of gas respectively. The ratio of electric power was much higher than the other research results. The energy consumption unit was analyzed as 238.68 Mcal/m<SUP>2.</SUP>year. It is 19% less than the previous research result on university campus energy consumption.
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신축 대학건물의 하절기 실내 열환경 실태 측정 및 평가
박용관(Yong-Kwan Park),고명진(Myeong-Jin Ko),장재동(Jae D. Chang),김용식(Yong-shik Kim) 한국생활환경학회 2014 한국생활환경학회지 Vol.21 No.2
This study is intended to measure and assess the indoor thermal environment of newly built university buildings in summer. Target buildings for the measurement and assessment of the indoor thermal environment are I university buildings in incheon area. Six buildings were selected by considering the key features and building use in university. They are main office, professor"s office, lecture room, library reading room, library storage room and cafeteria. And the Indoor thermal environment elements including temperature, relative humidity, air velocity, mean radiant temperature and PMV were measured and assessed in summer. The temperature of main office, library reading room, cafeteria was maintained in good condition with 24~27℃ in which the air conditioning system is running. The library storage room temperature was too low as of 22~23℃. Improvements are needed. The professor"s office and Lecture room temperature was slightly higher than the outside temperature because the ceiling FCU was operated by blowing mode. The room temperatures at window side was higher with 0.5~2.5℃ than the center and aisle of the room. It showed the characteristics of the glass curtain wall building. The improvement is needed in the case of large difference in temperature. The relative humidity in each rooms was generally good. But the relative humidity in library storage room was too high with 78-80%, so the humidity reduction is needed. In addition, the relative humidity at window side was slightly higher than the center and aisle of the room. The adjustment for the installed cooling equipment location or operating conditions are needed. The air velocities in each room was less than 0.5 m/s respectively. The mean radiant temperature of the professor"s office was the highest with 27.6~28.1℃. And the mean radiant temperature of the Library reading room and library storage room was lowest with 23.4~24.1℃. The PMV of professor"s office and lecture room was neutral condition with -0.2~0.0. The PMV of cafeteria, main office and library reading room was in cool condition with -0.6~-0.3, -0.7~-0.4 and -0.8~-0.2 respectively. However, the PMV of library storage room was in too cold condition with -1.7~-1.1. Actions to improve PMV were needed.
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