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정성일(Seongir Cheong),성내리(Naili Sheng),김두현(Doohyun Kim),이재근(Jaekeun Lee),황유진(Yujin Hwang),박종훈(Jonghoon Park),서석장(Seokjang Seo) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.7
In this paper, the effects of ventilation and humidification on thermal comfort and indoor air quality(IAQ) were evaluated in a classroom when a heat pump system was operated in winter. Thermal comfort parameters, such as temperature, relative humidity, globe temperature and air velocity, were measured at 9 points in the classroom. The concentration of CO₂ and total suspended particles(TSP) in the classroom were measured in order to analyze IAQ. Temperature distribution in the classroom was decreased by 2∼5℃ when the ventilation system and the humidifier were operated. When the relative humidity was adjusted to 60% by operating the humidifier and the ventilation system, the predicted mean vote(PMV) in the classroom was within the comfortable range of -0.5~0.5. When the ventilation system was operated, the average concentration of CO₂ and TSP were decreased by 645 ppm and 0.17 mg/㎥, respectively. This paper suggests the humidification and ventilation conditions to maintain the comfortable environment in the school classroom in winter experimentally.
LCC 분석을 고려한 일반 시설물에서 소형열병합발전의 최적 설계
강율호(Yulho Kang),구본철(Boncheol Ku),황유진(Yujin Hwang),송재도(Jaedo Song),정성일(Seongir Cheong),이재근(Jaekeun Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.8
Cogeneration system produces power as well as heat recovered from waste heat during power generation process. This system has higher energy efficiency than that of the power plant. In this study the optimal design for the cogeneration system with the increase of the capacity considering life cycle cost(LCC) analysis has been performed in the general facilities such as hotels and hospitals under the assumption of electricity cost of 95 won/㎾h, the initial cost of cogeneration system of 1,500,000 won/kW and the value of 0.5~1.0 in the ratio of heat to power. The optimal ratio of cogeneration capacity divided by average electricity load of facility was found out more than 0.5 in case of electricity cost with the increase of > 30%, and the percentage of CO₂ reduction was about 9%. The most important factors in the economic analysis of cogeneration system was found out the electrity cost and the initial cost of cogeneration system. Also the ratio of heat to power at the value of > 0.5 was not affected in the economy of cogeneration system, but was very important in the CO₂ reduction.