• Title/Summary/Keyword: 이중창

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A Numerical and Experimental Study of Heat Transfer through a Double Pane Window to Enhance Thermal Insulation of Building (건물 에너지 절약을 위한 수치해석적/실험적 이중창 열전달 연구)

  • 장동순;송은영;이상일
    • Journal of Energy Engineering
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    • v.1 no.1
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    • pp.66-75
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    • 1992
  • The performance of heat transfer through double pane window has been investigated using experimental and numerical methods. The range of the gap distance between glasses are 0.5-10 cm. The convection heat transfer plays the dominant role for the case of the wide gap distance together with the large Rayleigh number and thereby, reduces the enhanced thermal resistance due to the increased air gap, while the conduction heat transfer does the major role for the case of small gap distance. In order to enhance the thermal insulation of the double pane window, the heat transfer of triple pane window, which is constructed to put one more glass at the middle of the double pane, is investigated to check the reduction of the convection heat transfer together with the effect of the radiation shield due to the presence of the additional glass. Further, a spacer is installed at the middle height of the double pane, and the effect of which on the suppression of the convective heat transfer is analyzed carefully, using experimental and numerical methods. For the case of the spacer-installation, the amount of energy saving is considered about 10%, but the energy saving increases a lot to 30-50% for the case of triple pane window, due to the substantial radiation shield effect of the presence of the additional glass.

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외부창호의 차음성능 향상방안

  • 김성완;김하근;김명준
    • Journal of KSNVE
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    • v.3 no.3
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    • pp.209-219
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    • 1993
  • 본 글에서는 아파트단지의 교통소음도 예측프로그램인 "TRANOIS-93"을 통하여 교통량, 도로, 방음벽, 수림대 등 각종 영향요인을 검토하여 1차적으로 소음저감대책 수립을 위한 시뮬레이션을 수행하고, 이를 분석하여 외부창호에 의해서 소음을 차단하지 않으면 안되는 경우에 대해서도 효과적인 대책을 수립할 수 있도록 창호의 차음설계자료를 제시하고자 한다. 이를 위해 창호의 기밀성, 유리의 두께, 이중창 사이의 공간층에 설치된 흡음재, 이중창에서 바깥창과 안쪽창과의 간격, 유리창의 크기 등의 요인에 대해서 실험을 통하여 차음개선량을 파악하고 이를 분석함으로서 창호제작 및 설계업무에 활용될 참고자료를 소개하고자 한다. 소개하고자 한다.

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Numerical Analysis of Optimum Air-Layer Thickness in a Double Glazing Window (이중창 공기층의 최적두께에 관한 수치해석)

  • Hwang Ho June;Choi Hyoung Gwon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.191-199
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    • 2005
  • Double pane window system, in which an air layer with a finite width is filled between glasses, is used in order to increase the insulation efficiency. In the present study, a conjugate heat transfer problem of a double pane window system has been studied numerically in order to investigate the effect of an air layer on the heat transmittance of the double pane window system using a finite element method based on P2P1 basis function. In this study on the conjugate heat transfer of a double pane window system, numerically predicted Nusselt numbers with or without conjugate heat transfer effect have been compared with an available existing empirical formula. It has been found that a Nusselt number from an existing formula for an enclosed space is different from that obtained from the present conjugate heat transfer analysis mainly due to the effects of a very high aspect ratio and conjugate heat transfer mechanism. Furthermore, it has been shown that the numerically estimated optimal air thickness of the double pane window system with conjugate heat transfer effect is a little bit longer than that obtained without considering conjugate heat transfer effect.

Airflow pattern of Double window system for Remodeling by using Integrated Simulation. (통합 시뮬레이션을 통한 리모델링용 이중창 시스템 기류 패턴 분석)

  • Kim, Eun-Hee;Nam, Hyun-Jin;Yook, In-Soo;Kim, Jeong-Yoon;Kim, Jae-Min
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.1036-1041
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    • 2008
  • Double facade systems are often paid attention of as an effective energy saving measure for curtain wall buildings. However, it is not easy to install the system in existing buildings and requires substantial investment. An innovative double window system is proposed in this study which can be installed with exiting window systems in a cost effective way. the proposed system is connected to existing return ducts to make airflow between the existing window and the newly installed window. To ensure the best performance of the proposed system, simulation-based analysis was implemented in which airflow characteristics of inside double window were examined according to air pressures of return duct and window material by using computer simulation ESP-r. the overview of the proposed system and the results of the simulation-based analysis are presented in this paper.

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Study on thermal performance of vacuum window with various low-ε coating glasses (저방사 코팅이 진공창의 열성능에 미치는 영향)

  • Cho, S.H.;Tae, C.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.3
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    • pp.300-311
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    • 1997
  • A theoretical method was developed to analyze the effect of low-$\varepsilon$ coatings which have influence on thermal performance of vacuum windwo glazing and double pane glazing. The overall heat transfer coefficient(U) value and thermal performance were analyzed by theroretical method on various kins of windows. TRNSYS program was used to analyze total heating and cooling energy consumption on the model building which has various windows. As the result, better thermal insulation can be achieved on the vacuum window glazing than double pane glazing when low-$\varepsilon$ coating was done on the surface of glass. Total heating and cooling energy consumption was almost same on the double pane window glazing but was lessened on the vacuum window glazing when the window size of south direction increased. Therefore, low-$\varepsilon$ coating was very necessary for vacuum window glazing in order to improve thermal insulation performance and efficient energy conservation can be achieved by vacuum window glazing at the real building which has large window.

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Performance Analysis of Summertime Heat Transfer Characteristics of the Double Skin Window for Plant Factory (식물공장 이중창호의 하절기 열전달 성능 분석)

  • So, Jae-Hyun;Kim, Woo-Tae
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.24 no.4
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    • pp.351-357
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    • 2012
  • To reduce the summertime cooling load of a plant factory, a concept design was performed for the double skin window which utilizes the low temperature air from a ground coupled heat exchanger. The design parameters were selected as the number of cavity air inlet, the cavity thickness, the location of cavity air inlet, and the configuration of cavity air outlet. A parametric study was conducted in a systematic way to evaluate the heat transfer characteristics of the double skin window. As the number of cavity air inlet and the cavity thickness increase, the heat flux from outside air to indoor air was decreased. The effect of the location of cavity air inlet was not significant and the larger cavity air outlet area gave us relatively better heat blocking performance from outside hot air. This study demonstrated that it is possible to develop an improved double skin window by utilizing a ground coupled heat exchanger.

Research on Improvement of Efficiency in Flat Plate Solar Collector by Using Double-Wall Glazing and VIP Insulation (이중투과체 및 VIP복합 단열재 적용 평판 집열기의 성능 향상에 대한 연구)

  • Lee, Doo Ho;Jang, Han Bin;Kim, Young Hak;Do, Kyu Hyung;Lee, Kwang Seob;Lyu, Nam Jin
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.28 no.11
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    • pp.458-465
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    • 2016
  • The purpose of this research is to improve the thermal effiency of solar collector and to quantitatively analyze its performance. Solar thermal systems have been limited to water heating systems mainly using low-temperature range. However, through diverse developments, the application has been extended to medium- and high-temperature fields such as solar heating, solar air conditioning, and solar thermal industrial process. Among the diverse research, this research is specially focusing on enhancement of the thermal performance by minimizing the heat loss coefficient of flat plate solar collectors. In order to do it, a front-side glazing material and a back-side insulation material with high insulated structure is proposed and based on computational analysis, the performance of energy collecting volume of the proposed solar collector is analyzed. The research shows that the proposed structure has the excellent performance at medium- and high-temperature range. therefore, it is expected that the proposed structure can easily replace existing technologies.

Characterization of Particle Size Distribution of Infiltrated Secondhand Smoke through the Gap in a Single Glazed and a Secondary Glazed Window by Indoor and Outdoor Pressure Differences (실내외 압력 차에 따른 단창과 이중창의 틈새로 침투된 간접흡연의 입자 크기 분포 특성)

  • Kim, Jeonghoon;Lee, Kiyoung
    • Journal of Environmental Health Sciences
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    • v.44 no.4
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    • pp.360-369
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    • 2018
  • Objectives: Outdoor tobacco smoke can penetrate into the indoor environment through cracks in the building envelope. This study aimed to characterize the particle size distribution of infiltrated secondhand smoke (SHS) through the gap in a single glazed and a secondary glazed window according to pressure differences in a chamber. Methods: Two polyvinyl chloride sliding windows were evaluated for infiltration, one with a glazed window and the other with a secondary glazed window. Each window was mounted and sealed in a polycarbonate chamber. The air in the chamber was discharged to the outside to establish pressure differences in the chamber (${\Delta}P$). Outdoor smoking sources were simulated at a one-meter distance from the window side of the chamber. The particle size distribution of the infiltrated SHS was measured in the chamber using a portable aerosol spectrometer. The particle size distribution of SHS inside the chamber was normalized by the outdoor peak for fine particles. Results: The particle size distribution of SHS inside the chamber was similar regardless of window type and ${\Delta}P$. It peaked at $0.2-0.3{\mu}m$. Increases in particulate matter (PM) concentrations from SHS infiltration were higher with the glazed window than with the secondary glazed window. PM concentrations of less than $1{\mu}m$ increased as ${\Delta}P$ was increased inside the chamber. Conclusions: The majority of infiltrated SHS particles through window gap was $0.2-0.3{\mu}m$ in size. Outdoor SHS particles infiltrated more with a glazed window than with a secondary glazed window. Particle sizes of less than $1{\mu}m$ were associated with ${\Delta}P$. These findings can be a reference for further research on the measurement of infiltrated SHS in buildings.

A Change of Awareness on the Ondol System and Architectural Seeking for Increasing Heating Efficiency since the 18th Century Joseon Society (18세기 이후 조선사회의 온돌에 대한 인식변화와 난방효율 증대를 위한 건축적 모색)

  • Chung, Jung-Nam
    • Journal of architectural history
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    • v.27 no.3
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    • pp.15-26
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    • 2018
  • As a result of reviewing various documents and existing researches, since the late Goryeo period, the most active period in the Ondol(溫突, Korean floor heating system) facilities is the 17th century. The phenomenological reason was recovering the buildings destroyed by the Japanese Invasion of Korea in 1592(壬辰倭亂) & the Manchu War of 1636(丙子胡亂), but the underlying cause was an abnormal climate in which a pair of summer and winter cold continued. In the 17th century, as the Ondol facilities grew rapidly without distinction between regions and classes, the supply and demand of fuel caused economic and natural environmental problems. And a negative and positive view on Ondol was suggested. Since the middle of the 18th century, when the demand and supply of Ondol reached its peak, which could no longer increase, a new awareness of Ondol began to grow. The room was called the Panbang(板房) and the Ondol, depending on the material that made up the floor. It was considered natural to have the Ondol from this time on. The Incan(因間) and Jo(竈) that were made to burn were started to be recorded as a kitchen, regardless of size and function. Changes in social awareness of Ondol have led to concerns about heating efficiency. A variety of architectural explorations were conducted. Such a search was later realized in concrete architectural form. There is a double Ondoll structure, and the column spacing is reduced compared to the previous one. The heat buffer space is formed around the Ondol room, and the double window can control the light and the air going in and out.