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차량용 공조시스템의 현황 및 고속버스의 실내 공기 환경 측정
유호천(Yoo Ho-Chun),노경환(Noh Kyoung Hwan) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
The current focus of domestic car industry is moving from technological development to reducing greenhouse gas. This study investigates and measures the HVAC system and indoor air condition of highway buses, which is conducted to develop a HVAC system using natural energy in the future. The measurements show that thermal balance is not fulfilled because heating sources are randomly placed, and relative humidity is in the 20 percent range both in HVAC and non-HVAC systems, which is far below 40%, or the highest thermal comfort level. CO₂ concentration was found to be an average of 1500 ppm, but not more than 2522 ppm with 15 persons on board, and with 29 persons on board, an average of 2053 ppm, but not more than 3066 ppm, both of which far exceed allowed CO₂ concentration level, or 1000 ppm. Generally, highway buses drop by rest stops and open doors for 15 to 20 minutes for getting in fresh air. But its air improvement effect is temporary, and it exacerbates indoor air condition.
실내 공기질 및 에너지 절약을 위한 고속버스의 자연형 환기시스템
유호천(Ho-Chun Yoo),노경환(Kyoung-Hwan Noh) 한국생활환경학회 2010 한국생활환경학회지 Vol.17 No.1
In the wake of measuring the indoor air environment in express bus in operation, unbalanced indoor temperature and air quality appeared to be inferior. The relative humidity measured 20% was far below than 40~60% required for comfortable indoor environment, causing the passengers to suffer sore throat and stuffy nose. CO₂ measured was 1,500 ppm on average when 15 passengers were on board and 2053 ppm for 29 passengers, which far exceeded 1000 ppm, the limit for public facilities. CO₂ density was getting increased during operation till the bus stops at service area for 15 to 20 minutes, which was however again deteriorated when bus started running. Thus appropriate ventilation system is expected to help maintain the comfortable indoor environment. In an attempt to investigate the vent performance of the bus in operation, CFD simulation was conducted at the speed 60, 80 and 100 km/h and as a result, only a partial ventilation, instead of uniform ventilation, was achieved. And the effect of reducing the CO₂ by vent system using existing vent hole or ceiling structure was found to be more effective than existing vent device.
유호천(Yoo Ho-Chun),노경환(Noh Kyoung-Hwan),강현구(Kang Hyun-Gu),신인환(Shin In-Hwan) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
Amid the crisis of global climate change, interest in low carbon and energy-saving building has been increasingly growing. Korea is likely to be designated as one of the countries subject to CO2 reduction under the 'Post-20l2 Climate System' The efforts to minimize the building energy has been made and in line with the increasing need of low carbon and eco-friendly building, a demand for building evaluation programs has been on the rise. However, the metro logical data which is necessary for such program has not been effectively provided and moreover, the source, calculation method and period remain uncertain. This study was intended to evaluate the regional typical metro logical data (ISO TRY) provided by Korean Solar Energy Society and compile the month of test reference years (TRY), and analyze the regional weather using dry-bulb temperature, wet-bulb temperature and solar irradiance which are regarded the representative metro logical data.
유호천(Yoo Ho-Chun),노경환(Noh Kyoung-Hwan) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
In express bus which has no window, the air quality inside the bus is very critical for the passengers who staying for an extended time. Air conditioning system using natural energy is expected to significantly improve the air quality while the bus runs the suburban area. But the express buses today usually attempt to ventilate using air conditioning system, rather than natural ventilation. In this study, analysis of existing ventilation opening and the new ventilation system on roof, using computer simulation. As a result, two cases using existing ventilation device was found to be effective for partial ventilation only, while the air in front remains standstill. The new system proved to have promoted more dynamic ventilation in most of space.
HadCM3를 이용한 서울 및 울산지역의 미래 냉ㆍ난방도일 예측
이관호(Lee Kwan-Ho),유호천(Yoo Ho-Chun),노경환(Noh Kyoung-Hwan) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
The concern in energy reduction in the field of architecture which takes up a big weight in domestic energy consumption is gradually increasing. For this reason, a lot of research work on this matter is being carried out. Particularly, it is generally required that currently used system in a structure for energy reduction should be maximized in its efficiency. In addition, research on several energy reduction typed systems is underway. Such a research work should not only include the one in time of the present but also keep up with the trend for future-oriented research. This research paper forecasted and analyzed the trend for global warming and demand of a structure for energy in the future by applying climate scenarios to cooling degree-day and heating degree-day. Also, this research found out the decrease in heating degree-days and increase in cooling degree-days until this moment due to the progress of global warming. In addition, as for heating degree-days in the future forecasted on the basis of HadCM3, it is estimated that the range of decrease could be ever bigger starting 2010 in case of Seoul and also starting 2010 in case of Ulsan ever after respectively. In case of cooling degree-days, it is estimated that its increase range could be bigger abruptly starting 2050, and after 2080, its increase range would be much bigger.