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바닥급기 시스템의 거주역 공조를 위한 설계 기법 및 에너지 절감 효과에 관한 연구
유기형,송규동,Yu, Ki-Hyung,Song, Kyoo-Dong 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3
Underfloor air distribution system is generally known to be more energy-saving and provide more comfort as compared with overhead air distribution system. In practice, however, some buildings to which underfloor air distribution system is applied have less effectiveness in saving energy and are getting dissatisfaction with cold draft caused by wind velocity of air distribution in terms of comfort. It is judged that such problems are due to failure to consider properties of underfloor air distribution system in applying it and identical design with the design standards for the existing overhead air distribution system. This study aims at introducing an air conditioning type of the occupied zone for underfloor all distribution system to see its effectiveness in saving energy for air conditioning of the occupied zone through a comparative simulation with the existing air conditioning type.
유기형(Ki-Hyung Yu),송규동(Kyoo-Dong Song) 한국생활환경학회 2007 한국생활환경학회지 Vol.14 No.4
The purpose of this study is to analyze the performance of hybrid underfloor air distribution system. The characteristics of the several types of underfloor air distribution system were explicated. The computer simulation and the field and laboratories experiment were conducted. As the results, the pressure of plenum became decreased according to the increase of volume flow of FTU with hybrid underfloor air distribution system, but the pressure difference was not changed. The pressure difference was increased in proportion to the volume flow of AHU. It is necessary to consider the proper strategies when the plenum has the longer supply distance and/or the high pressure of the lower part.
유기형(Yu. Ki-Hyung),조동우(Cho. Dong-Woo),유지용(Yu. Ji-Yong),이진영(Lee. Jin-Young),이상엽(Lee. Sang-Youp) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The purpose of this study was to evaluate the indoor environment of office building with underfloor air distribution system and ceiling based air conditioning system. The underfloor air distribution system was introduced to use access floor and aim to economical motive such as reducing floor to height level. Researches were not sufficient to preserve the characteristics between ceiling based air conditioning system and underfloor air distribution system. Experiments have been carried out to indoor environment in the summer and winter. As the result, thermal environment of the underfloor air distribution system is better than ceiling based air conditioning system in the winter. Ventilation effectiveness of the underfloor air distribution system is bigger than ceiling based air conditioning system.
유기형(Ki-Hyung Yu),조동우(Dong-Woo Cho),송규동(Kyoo-Dong Song) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.4
The purpose of this study is to present the method of daylighting performance of the housing performance indicator system. Daylighting in the neighboring areas of apartment complex is very important especially under the circumstances of densely populated urban cities. Therefore, we need objective index that can be evaluated daylighting performance. Important items of day lighting performance in apartment complex are daylighting, artificial lighting, view, privacy etc. We are handling about day lighting performance using simplified methodology in this study. The method of day lighting performance of the housing performance indicator system being established as can evaluate easily, is expected to reduce estimation time and costs.
유정연(Yu Jung-Yeon),조동우(Cho Dong-Woo),유기형(Yu Ki-Hyung),정해권(Jung Hae-Kwon),양인호(Yang In-Ho) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.12
The purpose of this study is to evaluate for application of the new type of floor heating system with an improved performance than an existed floor heating system in apartment houses. The warmer and moderate part Ondol system suggested in this study were applied to the experimental apartment house and the mock-up room. The field measurements for this system were executed in winter climates. As a result of field measurement, when the load differences between perimeter zone and central zone are increased, the separately controled Ondol system divided in the warmer and moderate part can be evaluated as the new Ondol system with a capability for suppling proper heating energy for each zone. The user can have the freedom for changing warmer parts and the moderate parts and controlling each temperature according to their needs.
초고층 복합건물의 연돌현상 가중요인과 저감방안 사례연구
유정연(Jung-Yeon Yu),조동우(Dong-Woo Cho),유기형(Ki-Hyung Yu),정차수(Cha-Su Jeong),강소연(So-Yeon kang),송규동(Kyoo-Dong Song) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
The purpose of this case study is to analyze stack effect problems and to develop methods minimizing methods of stack effect in the tall complex building in cold climates. The main problems in the tall complex building occur in high-rise elevators. Such problems as elevator doors that do not close and exhaust airflows result in excessive pressure differences across elevator doors due to stack effect. Under the expected conditions causing these pressure differences, computer simulations with CONTAMW computer program and field measurements are performed in the tall complex building. The results are analyzed in architectural design aspects. With these analysis, the tall complex building design guidelines to minimize stack effect are proposed.
조동우(Cho Dong-Woo),유기형(Yu Ki-Hyung),유정연(Yu Jung-Yeon) 대한건축학회 2007 대한건축학회논문집 Vol.23 No.11
In Korea, all residential buildings adopt floor-heating systems for indoor thermal comfort. And the ratio of multi-family houses exceeds 50%. Lately problems of noise between floors and contamination of indoor air in multi-family houses emerged as social issue, and performance standards related to noise between floors and ventilation were established in Housing Regulation. Concerning these issues, many systems have been developed. Recently developed raised floor heating system is not only capable of basic function to reduce noise between floors, but also is a multi-functional floor heating system enabling natural ventilation. The procedure of this system for natural ventilation is to import outdoor air through bottom space of the floor heating system, circulate indoor space and discharge it out of ceiling. In winter, powerless natural ventilation is possible with buoyancy effect caused by temperature difference between outdoor and indoor. And it also allows saving of energy by importing pre-heated air in bottom space of the floor heating system. To evaluate ventilation performance of this system, on-site measurement was conducted in 2 test laboratories, and the nominal air change rate was satisfied as 0.4~0.8 h<SUP>-1</SUP> under the condition of outdoor temperature 5℃~-5℃, which was evaluated as highly possible to be applied as a natural ventilation system in multi-family houses. So, this system as hybrid ventilation system using natural ventilation is evaluated as highly possible for application. It also allows saving of energy by importing pre-heated air in bottom space of the floor heating system. Moreover, it was proven that air temperature at supply grille was maintained higher than indoor temperature, by which it was proven to enable blocking of cold draft problem.
김동희(Kim Dong-Hee),유기형(Yu Ki-Hyung),조동우(Cho Dong-Woo),유지용(Yu Ji-Yong),허정호(Huh Jung-Ho) 대한건축학회 2007 대한건축학회논문집 Vol.23 No.10
In this paper, we discussed the energy performance of underfloor air distribution(UFAD) and overhead air distribution system according to outdoor air intake rates in a office building. For this, the H building is selected for measuring the thermal environments of UFAD system and overhead system. Based on the measured data, the TRNSYS simulation is used to evaluate the energy performance of UFAD system and the overhead system according to outdoor air intake rates at virtual space. The zone of the UFAD system was divided into two horizontal nodes to simulate the temperature stratification and the overhead system was consisted of one zone considering full mixing in overhead system zone. Each node of UFAD system was coupled to its upper node. By increasing outdoor air intake rates from required outdoor air intake rates(100CMH) to maximum air intake rates, the energy savings of UFAD system comparing with overhead system are varied 15%~25.6% in summer, 12.8%~19% in fall/spring and not varied in winter(8%). As results of simulations on stratification height, the lower the stratification height, the larger cooling energy savings of UFAD comparing with overhead system according to outdoor air intake rates.