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정창헌(Cheong Chang-Heon),김태연(Kim Tae-Yeon),이승복(Leigh Seung-Bok) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.7
Energy retrofit of old residential building is very important, because old residential buildings take large amount in total residential building stock. Consequently, identifying the energy reduction effect of each building component's improvement should be performed. In this study, four major factors those affect the heating load significantly such as balcony thermal bridge, wall insulation, air-tightness and window property were considered. At first, the simulation condition and several variables such as U-factors of wall and window, linear thermal transmittance, air-tightness and infiltration are examined and simulation cases were established. Heating load of each case is verified by PHPP(Passive house Planning Package 2007). Simulation results show that removing balcony thermal bridge reduces heating load by 5.7%. Partial external insulation allowing thermal bridge does not reduce heating load much. Wall insulation reinforced to around 1.22~1.32 W/㎡K results in heating load reduction by 30.2~35.7%. Air-tightness enhancement to the passive house guideline reduces heating load by 22%. Mandatory additional ventilation rate of 0.7 ACH by retrofit increases heating load by 8.9%. However, the heating load reduction efficiency increases to 29.8% by adopting heat recovery ventilation system. Strengthening U-factor of window system to 0.8 W/㎡K diminishes heating load by 34.6%. Heating load of holistic model adopting most efficient components was 7 kWh/㎡a which meets the requirement of passive house standard in EU.
문헌고찰을 통한 노인요양시설 온열환경의 적정 수준 제안
정창헌(Chang Heon Cheong),이선혜(Seon-Hye Lee),서영미(Yeong-Mi Seo),박병용(Beungyong Park) 한국생활환경학회 2016 한국생활환경학회지 Vol.23 No.1
This study investigated the appropriate thermal conditions in the healthcare center for elderly through literature survey. Extensive literature survey on design cases and operation cases for healthcare center and hospital, physical/mental response of elderly to thermal environment were performed. The results of the study can be summarized as follow: (1) Dry bulb temperature and relative humidity can be used as the thermal indicators while PMV is available as the subsidiary indicator. (2) During heating season, slightly warm indoor environment is appropriate. The health problem of elderly at lower temperature is obvious and less metabolic rate and the physical activity of elderly can be problematic during the heating season. However, it is difficult to define the upper limit for indoor temperature for the lack of related researches and investigation. In the conservative point of view, it is reasonable to adopt the conventional comfort range for healthy adults for elderly.
Wells-Riley 식을 활용한 초등학교 내 공기전파감염관리 항목의 적용 우선순위 분석
정창헌(Cheong, Chang-Heon),황석호(Hwang, Seok-Ho) 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.4
This study evaluated the impact of airborne infection prevention measures by Wells-Riley equation to provide basic information for infection control in elementary schools. At first, the Wells-Riley equation is modified to reflect prevention measures against airborne infection such as facial masks, ventilation and air purifiers. Afterward, 22 scenarios are established to evaluate the impact of airborne infection prevention measures. The results indicate infector screening by fever check is the most influential followed by hi-efficiency mask (KF94), ventilation, cotton-mask, air-purifier. Especially, when an infector is present, airborne infection risk can be reduced effectively only when both of wearing masks and ventilating are well done. Cotton-masks are useful but have limited effect, and air-purifiers can be used as auxiliary measures.
정창헌(Cheong, Chang-Heon) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.2
This study investigated the influence of the various factors such as airborne pathogen type, space magnitude, ventilation rate and exposure time on the airborne infection risk. The parametric study is performed by airflow network simulation tool, CONTAMW 3.2. In addition, Wells-Riley equation is adopted to calculate airborne infection probability in a controlled volume. The results indicate occupancy time of infector significantly influence the airborne infection probability. In addition, smaller room size also affected to the increased infection risk. Especially, in the case of infector reside in a small room (30 m²) for 4 hours with 6 ACH of ventialtin rate, Tuberculosis infection risk of inpatient around infector increased to 21.0% (Influenza: 90.6%). Even though ventilation rate of 6 ACH looks appropriate in general condition to prevent airborne infection, increased ventilation over 6 ACH must be implemented to these critical environmental conditions involving smaller room size and long occupancy time.
관가정의 창면적비와 주광률 검토를 통한 자연채광 성능 분석
정창헌(Cheong, Chang-Heon),박병용(Park, Beung-Yong),류성룡(Ryu, Seong-Ryong) 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.4
This study evaluated natural lighting performance of Kwangajeong, the traditional housing in South Korea. Window-to-wall ratios were calculated by using the drawing documents. Daylighting factors were determined by field measurement. The results indicate that daylighting factor of the Kwangajeong is slightly low comparing present sustainable building design guide in South Korea even though the window-to-wall ratios are relatively high. It is thought that the relatively low daylighting factor are resulted by the low transmittance of Changhoji, the paper used on windows and Cheoma, eaves of the roof.
베이비부머 전후세대의 공동주택 외부환경과 건강관련 삶의 질 지표에 대한 인식 분석
정창헌(Chang Heon Cheong),김재희(Jahee Kim),이선혜(Seonhye Lee) 한국생활환경학회 2018 한국생활환경학회지 Vol.25 No.5
The survey is performed to identify the perception of baby boomer and others about relation between healthrelated quality of life(HRQoL) and outdoor environment. EQ-5D tool is used to figure out the human factors regarding HRQoL. Mobility and anxiety/depression factors are considered as the major factors influence HRQoL relating outdoor environment of multi-family housings. The results of the study indicate the baby boomer more feels that the green space and community space in multi-family housing(apartment) have positive effects on HRQoL while outdoor steps and stairs have negative effects. Woman and people with disorder replied that the outdoor steps and stairs lowers the HRQoL. There was a clear perception gap between the previously mentioned groups and the other groups. Consequently, it is required to design outdoor environment appropriately to improve HRQoL of occupants.
CFD를 이용한 병실 국부지역의 공기전파감염확률 평가사례
정창헌(Cheong, Chang Heon) 한국건축친환경설비학회 2017 한국건축친환경설비학회 논문집 Vol.11 No.1
The purpose of this paper is to suggest the evaluation method for airborne infection risk at specific location in an area. The suggested method integrates the computational fluid dynamics(CFD) simulation and Wells-Riley equation. CFD simulation is used to derive the airborne pathogen concentration in a specific location by using passive scalar model. Wells-Riley equation is based on the airborne pathogen concentration at well-mixed room air and stead state. Suggested method substituted the airborne concentration of well-mixed condition to of spatial airborne pathogen concentration. The airborne pathogen was considered as passive scalar instead of particle matter contrary to the previous studies. The case study is performed to availability of the suggested evaluation method. The suggested method showed inhomogeneous expected airborne infection risk according to the elapsed time at a specific location. In order to implement this method to establishment of hospital design guideline, determination of airborne pathogen intensity and elapsed time of patient occupancy is required. In addition, the suggested method has limitation that the infection risk around pathogen source can be under-estimated in real situation because the airborne pathogen(droplet nuclei smaller than 1㎛) regarded as passive scalar does not act like droplet larger than 5㎛.
조경 식재 방식에 따른 공동주택단지 보행구역의 빌딩풍 변화 분석
정창헌(Cheong, Chang-Heon),류성룡(Ryu, Seong-Ryong) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.11
The purpose of this study is to evaluate the building wind reduction in the residential community by the planting method. Planting at the boundary region and the partial districts of the target site are considered. The simulation is performed by CFD tool, Star-CCM+. The results show that planting at the boundary of the region generally results in the significantly wind speed reduction around the boundary planting position. However this type of planting does not reduce the wind speed significantly at middle area of the site because of the down-ward airflow generated by the tall building facade. Planting at the partial placement in the residential community slightly reduce the wind speed at target area. However, undesirable wind speed increases at other parts were occurred. According to the results, the planting method affects the wind speed reduction effect. When the trees are spread at the target area, wind speed is reduced effectively. Basing on the results, we can also conclude that planting at the boundary region and specific district are useful for wind speed reduction at the target site.
이중창호 적용을 통한 공동주택 에너지 소비량 저감 성능평가
정창헌(Cheong Chang-Heon),김지영(Kim Ji-Yoeng),김태연(Kim Tae-Yeon),이승복(Leigh Seung-Bok) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.12
Energy consumption reduction is becoming a urgent issue in Korea. Especally, energy supply in Korea definitely depends on import. Energy consumption in building is the most easiest method even if it takes relatively long time to get sufficient effects. In this paper, verification of the enegy reduction performance of the double window system was performed by Esp-r simulation. As a result, by substituting a conventional window system to the double window system, heating energy reduction is about 39% and cooling energy is increased about 6.5%. Additionally adopting shading system during may to octpber at the south double windows, cooling energy was reduced by 3%. This result reflects the realistic occupancy life pattern, and enen though shading device can reduce cooling load during the entire day, partial operation of cooling facilities in residential unit caused minimized energy consumption in cooling load. It is turned out that application of double window system can reduce about 24% of total energy consumption in a residential unit, including electrical equipment and domestic heating energy consumption.