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천장형 유닛을 설치한 교실 내의인체 주변 온열환경에 관한 실측연구
조성우,임영빈,이경희 대한설비공학회 2006 설비공학 논문집 Vol.18 No.3
This paper performed to investigate on vertical temperature distribution, effective draft temperature(ETD) and PMV(Predicted Mean Vote) in the classroom, which is located YangSan city(Kyungsangnam-Do), Korea, is equipped with ceiling unit. The vertical temperature difference between F.L+10cm(ankle) and F.L+120cm(neck) of a measuring point which is adjacent corridor in the classroom showed about 1℃ but of measuring point which is adjacent outdoor expressed up to 4℃. The effective draft temperature(ETD) is -2.3 and -0.52 and 0.67 at near ceiling unit but is 1.2 and 3.3 at far from ceiling unit. The PMV of total classroom showed the range of "Cold" and "Slightly Cold." Therefore, to achieve comfort condition in the classroom is equipped with ceiling unit, the location of ceiling unit and discharge angle and discharge distance from ceiling unit are very important elements.
천장패널 이용 복사냉방시스템의 냉방특성에 관한 실험적 연구
김용기(Yong-Ki Kim),우남섭(Nam-Sub Woo),한태수(Tae-Su Han),호주원(Ju-Won Ho),이태원(Tae-Won Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
One of the hybrid(load-sharing) HVAC systems that attracted attention for its potential for energy savings while providing high thermal comfort is a radiant cooling system using ceiling panels. Panel systems may be combined either with a central forced-air system or with decentralized convective systems, or with in-space fan-coil units. In this study, the ceiling radiant panel system is combined with a fan-coil unit for the cooling load sharing and the dehumidification. The main thrust of this research is to analysis the cooling characteristic of the hybrid HVAC system with ceiling panels and to estimate the cooling load fraction of between fan-coil units and ceiling radiant panel under various condition. It was found that the cooling load fraction of chilled ceiling panels can be enhanced in the air volume of a fan-coil unit by 40~67% under the dew point control.
실링 유닛 장착효과를 고려한 MR16 LED 조명등 방열설계
황순호(Hwang, Soon-Ho),이영림(Lee, Young-Lim) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.9
LED 조명등의 효율 및 수명을 단축시키는 가장 중요한 원인은 정션온도 상승이며, 이를 해결하기 위해 고 효율 방열 패키징, 고전도율 소재 개발, 접촉저항 개선 및 히트싱크 최적화 등과 같이 다양한 방열성능 향상 연구가 이루어지고 있다. 하지만 지금까지의 대부분의 연구는 LED 조명등이 단지 대기 중에 노출되었다고 가정하였기 때문 에 실제 실링 유닛과 함께 천장에 장착되었을 때의 방열성능은 아직 보고되지 않고 있다. 따라서, 본 연구에서는 MR16 LED 조명등을 이용하여 실제 설치조건에 따른 정션온도 변화를 규명하고 이를 통한 더욱 정확한 LED 조명등 수명 및 효율 예측을 이루고자 하였다. The most important cause for shortening LED lighting efficiency and life is the junction temperature rises and, to solve this problem, various studies such as thermally efficient packaging, highly conductive material development, contact resistance improvement or heat sink optimization have been studied. However, most studies so far assumed that the LED lights are in the atmosphere, and thermal performance has not been therefore reported when the LED lights are mounted on the ceiling with ceiling unit. Thus, this study investigates the variation of junction temperature of the MR16 LED light under actual installation conditions and more accurate thermal design for the efficiency and life of LED lights is therefore achieved.
태양열을 활용한 천정형 공조기의 운전특성 및 효율성에 관한 평가
임홍석(Hong-Seok Lim),금종수(Jong-Soo Kum),김동규(Dong-Gyu Kim),김민수(Min-Soo Kim) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.2
In this study, we have studied a performance evaluation of air handling unit when solar system is applied in large space.stored solar thermal energy from sun to storage tank through solar collectors. Solar thermal energy is sent to heat exchanger and exchange heat with air in heat exchanger. Heated air is supplied to indoor room through air-handling unit. When this system is applied to large space. We confirmed the availability of heating system in large space. And the result shows temperature characteristics of solar system with Air-Handling Unit and the effectiveness of this system experimentally. When only storing solar heat, the temperature of storage tank is raised to 65oC, but, when radiating the solar heat, the temperature of storage tank is raised to 45oC. Finally, the efficiency is about 41-45%, and it is considered the economic benefits have.
김혜연(Hyeyeon Kim),배상환(Sanghwan Bae) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.5
This study consists of an analysis of pre-existing ceiling construction systems as well as the development of a replacement unitary, lightweight steel ceiling system and related legal standards. Based on the material conditions and progression of the study, appropriate components were chosen and details were modified by mock-up test. A final study model was evaluated for performance and adaptability based on four parameters (indoor environment, constructability, budget economy, and aesthetics) and compared to the pre-existing ceiling system. As a result of the initial study, a lightweight steel design was created consisting of a reinforced structure with modular bars and entry holes for components. This system was hung directly on the suspension structure. The new design increased lighting and acoustic performance adapted to an indoor environment. Moreover, the speed of construction was increased by approximately 30%, the cost was decreased by approximately 20%, and ceiling aesthetics were improved.
기류속도의 영향을 고려한 천장복사냉방패널의 냉방용량 평가 유닛 개발
이규남(Rhee, Kyu-Nam),김상엽(Kim, Sang-Yeop),최지수(Choi, Ji-Su) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.6
In this study, an evaluation unit was proposed to analyze the cooling capacity of ceiling radiant cooling panel (CRCP) system. The aim of this study was to develop a low-cost and simple testing device by which the cooling capacity of a single CRCP can be evaluated and the impact of air velocity on the cooling capacity can be analyzed. For this purpose, a thermoelectric element module (TEM) was adopted to produce the hot water for the cooling load as well as the chilled water for the CRCP. The configuration of TEM, cooling fans, and radiator was studied to achieve the proper temperature of hot and chilled water. In addition, a cross flow fan and fan speed controller were deployed to represent the air flow at panel surface. The test results showed that the cooling capacity of the evaluated CRCP was 103.3 W/㎡, without the air flow at panel surface. It was also found that the cooling capacity can be enhanced up to 176.0 W/㎡ when the air velocity increases up to 2.0 m/s. The enhanced cooling capacity led to the increased temperature difference between room air and chilled water, which implies the possible mitigation of condensation risks.