• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.27 no.9
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• pp.463-467
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• 2015

The air-bubble sheet has been widely used to wrap fragile products for long-distance transportation. The further usage of the air-bubble sheet as a thermal-insulation material for the reduction of the thermal conductivities of window systems has occurred because of its low price, in addition to its thermal-conductivity properties. In this study, the thermal performances of a variety of commercial air-bubble sheets according to various applications were evaluated. The experiments were performed with single-glazed and double-glazed windows and three types of air-bubble sheets of different air volumes. U-values are used and were calculated for the determination of the thermal performances that are based on the KS F 2278. The maximum decrease of the U-value was measured as 1.092 when a sheet was attached onto the frame of single-glazed window. The square-like air-bubble sheet that contains the largest air volume shows the highest thermal-resistance value. Double layers of the air-bubble sheets show better performances than those of the single layers on both sides of the windows.

• Journal of the Korea Institute of Building Construction
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• v.24 no.4
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• pp.437-445
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• 2024

This study investigated the thermal insulation performance of Azon and Azo-Core, two materials commonly used in window frames, for potential application in window shutters. A three-pronged evaluation approach was employed, utilizing the Therm 7.4 software, confidential test results, and dedicated thermal insulation testing. The simulation data indicated that both Azon and Azo-Core offered superior insulating properties compared to conventional shutter insulation materials. When incorporated into shutters, these materials achieved a first-grade sealing performance and a measured average thermal conductivity of 2.018W/m²·K. While this thermal conductivity value surpasses the standard requirements of 1.5W/m²·K for central regions and 1.8W/m²·K for southern regions in Korea, it falls within the acceptable limit of 2.2W/m²·K established for the Jeju region. Based on these findings, Azo-Core, warranting further dedicated research, presents itself as a promising candidate for shutter insulation material, particularly in applications targeting the Jeju region.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.05a
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• pp.175-175
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• 2015

졸겔 방법으로 산화금속 나노구조체를 합성하고, 이를 균질하게 코팅하는 방법을 개발하여 창호의 단열 효과를 증대시키는 기술을 개발할 수 있었다.

• 한국태양에너지학회:학술대회논문집
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• 2012.03a
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• pp.200-205
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• 2012

In the high oil price age, intensification of energy efficiency promotion in the building sector is required. Windows are dominating in large percent of whole building loads, and are regarding as the primary target of energy efficiency. In this study, in order to reduce heat loss of buildings, we investigate the thermal performance properties of Temperable Low-e glazing coated Ag membrane that has high electrical conductivity. The Temperable Low-e glazing windows has high insulation and shading properties, and it has strength that can supply various product which consumers want. In order to evaluate thermal performance of temperable windows, we install single low-e windows and double low-e windows in the experimental chamber and analysis the comparison heating energy consumption between single and double Low-e glazing windows. performance evaluation was conducted.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3307-3314
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• 2012

The annual energy demand of the standard rural house models was analyzed using the DesignBuilder. Indoor temperature set-point, U-value of outer wall, type of window, and degree of ventilation were selected as simulation parameters. In all the simulation cases, heating energy demand was higher than cooling energy demand regardless of the building size. When the lower U-value of the outer wall was applied to account for the thicker insulation layer, heating energy demand was decreased while cooling energy demand was increased. However, it is better to reduce the area of outer wall which is directly exposed to outdoor air because reducing the U-value of the outer wall is not effective in decreasing heating energy demand. Among the four different window types, the double skin window is most favorable because heating energy demand is the lowest. For a fixed infiltration rate, higher ventilation rate resulted in an increased heating energy demand and had minor impact on cooling energy demand. As long as the indoor air quality is acceptable, lower ventilation rate is favorable to reduce the annual energy demand.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.24 no.5
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• pp.422-427
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• 2012

This study investigates on the relationship between total load which is caused by infiltration and insulation thickness against compensation effect. As the result of experiment, the PVC(Synthetic resins sash) window frame in airtightness is superior to the AL(Aluminum sash) window frame. In this study, as the increasing of insulation thickness in reference building does not reduce significantly cooling load, the compensation effect due to airtightness against infiltration is very small. But the compensation effect against infiltration can be closely related with heating load. Therefore, the proper thermal insulation thickness can be needed respect to cooling and heating load.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.311.1-311.1
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• 2013

건축물의 유리창을 통하여 유입되는 태양광을 조절하여 냉난방 부하를 절감하고자 사용하는 스마트 윈도우 필름(Electrochromic (EC), Polymer Dispersed Liquid Crystal (PDLC), Suspended Particle Display (SPD))의 방식이 있다. 이러한 스마트 윈도우 필름은 건물 외피에 적용할 때 여름철 태양으로부터 유입되는 열선 차폐만을 목적으로 유리를 완전히 불투명하게 가려버리는 것은 맑고 투명해야하는 창호의 기본적인 용도를 무시한 단편적 기술로서, 스마트 윈도우 필름을 작동하여 투명하게 할 경우 외부에서 열선이 유입되는 문제를 가지고 있다. 스마트 윈도우 필름을 만들 때 필수적으로 사용하는 전극필름으로 플렉서블 기판에 투명 전도막이 형성됨과 동시에 적외선만을 선택적으로 차단하는 기능을 가지는 필름을 제조하여 단열 성능 실험을 실시하였다. 아울러, 스마트 필름의 다양한 적용을 위한 발열 실험도 실시하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.11
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• pp.5284-5289
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• 2011

This study focused to evaluate thermal transmittance(U-value) performance of sliding type of aluminum alloy window frame(AAWF) with double glazing(DG) and glazing spacer and that without thermal breaker in winter and summer season by two dimensional steady state heat transfer analysis. The AAWE was installed to an existing educational facilities in Seosan area which is the southern region of the Korean Peninsula. Analysis of 2D steady-state heat transfer was performed through the use of BISCO as calculation and simulation program. U-value and temperature factors were calculated. The results are as followed. First, the isotherm simulation shows that AAWF with double glazing have serious differences from recently proposed window thermal performance standards such as Insulation Performance of Windows and Doors of Building Energy Saving Design Standards and the results of calculation of thermal transmittance performance of AAWF and DG are U=9.631 W/$m^2K$, U=2.382 W/$m^2K$ respectively during winter and summer season. Second, the results of analysis of heat transfer analysis, calculated by simulation, shows that 225% of heat is lost comparing with thermal performance standards U=4.0 W/$m^2K$ of general double glazing among those standards on AAWF without thermal breaker.

• 한국태양에너지학회:학술대회논문집
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• 2009.11a
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• pp.32-37
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• 2009

An energy loss through the window system occupies about 10 to 30 percent on energy consumption of the whole building. That is the reason, several elements for a building composition of window system are the weakest from the heat. Insulation performance increases for the reducing heat loss. Heat transfer through the window system that is reducing heat transfer through conduction, convection and radiation. Insulation performance reinforcement methods classify improving heat specific quality of window system and improving efficiency of whole window system. The most application method among each methods is reducing emission ratio of the window system(Low-E glass), increasing a number of glazing(multiple window) and a method of vacuuming between glazing and glazing. Therefore this study is investigated a sort of glazing and specific character, U-value calculation with changing glazing thickness and calculation of temperature distribution and U-value with a glazing charging gas kind from double glazing. For a conclusion, an aspect of U-value figure at the smallest value case of vacuum glazing with Low-E coating. That means insulation efficiency is the best advantage during a building plan selecting vacuum glazing with Low-E coating for a energy saving aspect. In this way, U-value become different the number of glazing, coating whether or not and selecting injection gas. Therefore selecting of glazing is very important after due consideration by a characteristic and use of building and consideration of strong point and weak point.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.159-162
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• 2009

세계적인 에너지 자원 무기화와 더불어 에너지 효율이 높은 창호개발이 지속적으로 진행되고 있다. 이중 진공패널은 단열성능이 우수하여 건물에서의 에너지 절약 측면에서 미래의 창호소재로 각광 받고 있으나 구조 및 제조공법에 관한 규명이 되어 있지 않다. 진공패널은 대기압 및 외력에 견딜 수 있도록 구조를 형성해야 하며, 이를 위하여 진공간극을 유지하기 위한 지지대를 사용한다. 본 논문에서는 진공패널에서 지지대의 배열에 따른 진공패널의 응력분석과 이 데이터 평가를 통한 허용응력 내에서의 유리지지대 배열방안을 제시하고 시뮬레이션을 통해 그 타당성을 검증하였다.