• Title/Summary/Keyword: Temperature window

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An Experimental Study on the Effect of Hanji Windows on Indoor Air Temperature and Humidity Control (한지창호의 실내 온.습도 조절효과에 관한 실험적 연구)

  • Jang Gil-Soo;Park Sa-Keun;Song Min-Jeong;Shin Hoon
    • Journal of the Korean housing association
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    • v.17 no.2
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    • pp.125-134
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    • 2006
  • The tightness of windows have devoted to the improvement of thermal insulation and energy saving in buildings. But it is known that this tightness causes some side effects such as low ventilation, low capacity to humidity and temperature control and these are not profitable for inhabitants. To act on these side effects, Korean traditional windows which are composed of Han-Ji(Koreand traditional paper) and Chang-Sal(Korean traditional wooden frame) have been studied to get a reasonable solutions for these problems. In this study, to compare the thermal and humidity control performance of current window(12 mm pair) and Korean traditional windows, frames which are made of existing window and Korean traditional windows are adapted to scale model house and then humidity and temperature of in and out of scale model house are measured and analysed. The results of this study are followings ; 1) When Korean traditional window charges 20cm(1/8 of total window area) from total window area, Han-Ji window has higher thermal insulation than that of existing window in daytime. There is the most big thermal difference when double faced with double-ply Han-Ji window is placed to mock-up house. In night-time, the temperature difference is very small so this means that Korean traditional window is good to cover direct sunlight in daytime and reduce the temperature of balcony. One faced with one-ply han-Ji window has the best humidity penetration performance among three type of Korean traditional windows. 2) When Korean window area enlarged to 40cm(1/4 of total window area), the function of 40cm width Han-Ji window is higher than that of 20cm's. This means that enlargement of Han-Ji window cover direct sunlight more and is more efficient in humidity penetration.

A Study on the Performance Test and Verification of Heat Transfer characteristics in Automobile Rear Window Heater (자동차 후면 유리 열선의 열전달특성에 따른 성애제거 성능평가 및 성능검증 방법에 관한 연구)

  • Juen, H.Y.;Lee, C.K.;Bae, H.J.;Lee, S.J.
    • Journal of Power System Engineering
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    • v.9 no.2
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    • pp.73-80
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    • 2005
  • Both theoretical and experimental investigations were conducted to analyze defrosting behavior of a window heater operating in the low outdoor temperature($-20^{\circ}C$). To achieve this purpose, first a warm-chamber experiment($23^{\circ}C$) was performed to measure inner and outer surface temperature of the rear window(heated by the electric heater supplying 195 W) as functions of both time and position. Secondly, a cold chamber experiment was made to continuously record defrosting process of the frosted window. From the comparisons of the two experimental results, it was found that there was a similarity between the spatial distributions of both temperature and remaining frost. Thus, the temperature data from the warm-chamber experiments can be utilized to predict an expected zone covered with remaining frosts, and this approach can also be adopted in the inspection process in order to economically guarantee optimized performance of the window heater. Finally, an analytical model based on one-dimensional, steady-state heat transfer theories was proposed and successfully predicted the outer surface temperature of the rear window surrounded by cold air($-20^{\circ}C$) for the given operating conditions(heater power, inside and outside heat transfer coefficients, and surrounding air temperature, etc.).

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A Study on the Analysis of Heating and Cooling Load through Applying Window Film Insulation (열 차단 필름의 적용에 따른 냉난방 부하 분석에 관한 연구)

  • Kim, Seok-Hyun;Cho, Young-Hum
    • Journal of the Korean Solar Energy Society
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    • v.33 no.6
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    • pp.47-53
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    • 2013
  • In order to reduce the energy consumption of the building, much effort is being made. The problems are that excessive solar radiation in summer and the heat loss in winter by the increase of window area. To prevent this problems, government limited the window area ratio or the performance of windows in new buildings. In order to reduce energy consumption of the existing buildings, the window film insulation is spotlight because the window film insulation was simple to installation. This study confirmed the performance of the window film insulation and affect to heating & cooling load of buildings. The impact of the window film insulation coating was confirmed by experiment. And this study confirmed the annual heating & cooling load by simulation. As a results, the surface temperature of coated window was higher than the surface temperature of existing window. The window film insulation was increased surface temperature of window. And this study confirmed that the increased surface temperature was slightly affected the room air temperature through experiment of the insulation box. The results of the heating and cooling load by simulation, this study confirmed that the case of coated window film insulation decreased cooling load in summer and increased heating load in winter. Also the annual total heating & cooling load was increased a little in the case of coated the window film insulation.

The Study on the Characteristics of ReRAM with Annealing Temperature and Oxide Thickness (열처리 온도 및 산화층 두께에 따른 ReRAM 특성 연구)

  • Choi, Jin-hyung;Lee, Seung-cheol;Cho, Won-Ju;Park, Jong-tae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.10a
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    • pp.722-725
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    • 2013
  • In this work, we have been analyzed the characteristics of ReRAM with different annealing condition and temperature. The ReRAM devices with top electrode=150nm, bottom electrode=150nm, oxide thickness=70nm and annealing temperature=$500^{\circ}C$, $850^{\circ}C$ have been used in characterization. The Set/Reset voltage, sensing window and resistivity have been characterized. From the measurement results, the Set/Reset voltage and sensing window have been enhanced as the annealing temperature has been increased. But it has been decreased as the temperature performance has been increased. In case of the annealing temperature=$850^{\circ}C$, the variation of Set/Reset voltage was lower than that of other condition. But the variation of sensing window was the lowest when the annealing temperature was $500^{\circ}C$. With considering the variation of Set/Reset voltage and sensing window, the devices annealed at $850^{\circ}C$ showed the best performance to ReRAM.

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A Numerical Study on the Cooling Characteristics of Seeker Windows for Selecting Efficient Cooling Method (효율적인 냉각 방식 선정을 위한 탐색창 냉각 특성 해석 연구)

  • Kim, Manshik;Lee, Dong Min
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.2
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    • pp.246-254
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    • 2017
  • In this paper, cooling characteristics of seeker windows were examined using the Sinda-Fluint software. Various cooling methods were considered to satisfy the limit temperature of the cooled seeker window which would be exposed to excessive aerodynamic heating conditions by varying coolant type and mass flow rate of coolant. Due to the enhanced heat transfer between the coolant and the seeker window, internally cooled seeker window which uses liquid coolant showed lowered temperature distribution in the window compared to internally cooled seeker window which uses gas coolant. External film cooled seeker window also showed good cooling characteristics because it reduces the convective heat flux to the seeker window fundamentally. It was also confirmed that the temperature and the temperature gradient of seeker windows were significantly reduced for the cases which use external film cooling additionally to the gas and liquid cooled seeker window.

Effect of Heat Treatment Condition on the Processing Window of 3.60wt%C-2.50wt%Si-0.80wt%Cu Austempered Ductile Cast Iron (3.60wt%C-2.50wt%Si-0.80wt%Cu 조성 오스템퍼드 구상흑연주철의 프로세싱 윈도우에 미치는 열처리 조건의 영향)

  • Park, Jung-Jee;Seo, Gap-Sung;Kwon, Hae-Wook
    • Journal of Korea Foundry Society
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    • v.29 no.2
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    • pp.86-94
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    • 2009
  • The effect of austenitizing temperature and time on the processing window of 3.60wt%C - 2.50wt%Si - 0.80wt%Cu ductile cast iron and that of the amount of copper added were investigated. The second stage reaction at 400oC was retarded with increased austenitizing temperature. The widest processing window was obtained at the lower austempering temperature with the increased time at the same austenitizing temperature. The width of the widest processing window was decreased with the increase of time at the same austenitizing temperature. The width of processing window was increased with the increased amount of copper added.

The Evaluation of the Temperature Characteristics at the Spendrels of Curtain wall with a-Si BIPV Window System (스팬드럴 부분 BIPV창호 적용 및 후면마감재 구성에 따른 온도특성 분석 연구)

  • Kim, Dong-Su;Oh, Myung-Hwan;Yoon, Jongl-Ho
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.165-170
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    • 2012
  • This study aims to analyze the characteristics of temperature variation of Spandrels. According to the change of SHGC of Window system, air space, insulation performance and absorption factor of inner surface at the Spandrels, It was firstly estimated by using simulation. Secondly, measured to minimize the temperature-rise of inner surface temperature and the intermediate air temperature by using Full-scale Mock-up based on the result of simulation analysis. As a result, it turns out that low SHGC window system such as BIPV system had an advantage of reducing the window surface temperature, and the surface temperature of clear window system was all higher than BIPV system on simulation results. In the experiment results, it had some advantages of increasing the Spandrels volume, decreasing insulation performance and lower absorption factor.

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Development of transparent anti-fog window device using ITO (투명전극을 이용한 display용 김서림 방지장치 개발)

  • Kim, Chang-Gyu;Yu, Geun-Ho
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.07a
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    • pp.353-354
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    • 2008
  • in the environment with high temperature and humidity, surface temperature of the display window should be increased more than the temperature of water-vapor in order to get rid of fog. In this study, we manufacture anti-fog window device which has better transparence and gets high temperature by using ITO.

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Study on Estimate of Window Condensation performance Due to Temperature Depreciation Ratio (표면 온도 저하율에 따른 창호부 결로성능 예측에 관한 연구)

  • Sung, Uk-Joo;Cho, Soo;Jang, Cheul-Yong;Lee, Jin-Seong;Peak, Sang-Hun
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.1255-1260
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    • 2006
  • This present study analyzed temperature depreciation ratio of window inside surface by KS F 2295 'Procedure for determining fenestration product condensation resistance values'. it estimated window indoor surface condensation due to variable environmental condition. Performance of condensation resistance by using temperature depreciation ratio until applied Low-e and Ar glazing improved about 45% from 24 mm clear. Temperature depreciation ratio by KS F 2295 considers analytic index of window condensation due to variable boundary condition.

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The evaluative study of window defrost using Computational Fluid Dynamics (CFD를 이용한 Window Defrosting 평가)

  • Lee, I.S.;Im, H.N;Choi, J.W.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.179-182
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    • 2011
  • The purpose of this study is to evaluate a defrost model for the possibility of defrosting on wheelhouse window and the heat capacity if defrosting nozzle by using the commercial CFD solver FLUENT. A detailed simulation model has been created which contains the defrosting nozzle, window and the interior/exterior forced convection boundary. In this numerical study, the heat and mass transfer coupled during defrosting and investigated the defrost time for different hot gas temperature, external wind speed and temperature condition.

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