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건축물에너지 효율을 위한 조적조 열교 차단 브라켓의 성능 평가 연구
김웅회 ( Kim Woong-hoi ),김형규 ( Kim Hyung-kyu ),이태규 ( Lee Tae-gyu ),이재현 ( Lee Jae-hyun ),김규용 ( Kim Gyu-yong ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
The masonry structure is constructed by cement mortar binding material of brick objects and uses reinforced hardware(connected hardware or wall tie) together when building. However, over time, the corrosion of reinforced steel and the deterioration of joint mortar as well as bricks cause the risk of collapse. In particular, when the externally decorated brick wall is installed on the concrete girder for each floor, the angle bracket is not constructed or corroded, the full-layer weight load is applied to the wall of 0.5B, which is an example of full-scale or collapse. As a result of the evaluation, it was confirmed that the performance was improved compared to the existing bracket, and we plan to carry out a real-life test and long-term performance review of the building using the bracket in the future.
그린 리모델링용 열교 차단 외단열 시스템의 에너지 성능 평가 연구
김웅회 ( Kim¸ Woong-hoi ),강은호 ( Kang¸ Eun-ho ),윤종호 ( Yoon¸ Jong-ho ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
We set the representative balcony types of the existed building to two types: unexpanded balcony and extended balcony, and analyze the effect of reducing the cooling and heating energy load when applying remodeling. The scope of the study was limited to balcony walls, including window-wall junctions, and was conducted by comparing cases with and without thermal break insulation structures for a clear conclusion. The study was conducted using the equivalent U-value in each case. The equivalent U-value was calculated by deriving through 2 dimensional steady-state heat transfer analysis of each case balcony envelope. And building energy was calculated using the derived equivalent U-value. According to the calculation results, for unexpanded balconies, the equivalent U-value was reduced by about 80%, and the heating and cooling load was reduced by about 20%. In the case of extended balconies, the equivalent U-value was reduced by about 57% and the resulting heating and cooling load was reduced by about 12%.
박철용 ( Park Cheol-yong ),김웅회 ( Kim Woong-hoi ),이상희 ( Lee Sang-hee ),남승영 ( Nam Seung-young ),윤길호 ( Yoon Gil-ho ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Thermal bridge on a building envelope causes additional heat loss which increases the heating energy consumption. As the higher building insulation performance is required, heat loss through thermal bridge becomes higher proportion among total building heating energy consumption. For the exterior insulation and finish system, thermal bridge between window frame and concrete wall should be constidered as one of main reasons of heat loss. In this study, the thermal bridge barrier between window frame and concrete wall(STAR) was proposed as the best practice for reducing thermal bridge. The STAR was confirmed that the use of thermal bridge barrier imporved the annual heat energy capacity by 35% or more and the innitial construction cost by 7.4% or less because of additional interior insulation against condensation. Finally the life cycle cost during 20 year by heating energy of a building reduced by 25% or more compared with the exist technology. This STAR thermal bridge barrier will be used as the main technology to improve the energy efficiency of building.
건축물의 창틀과 벽체 사이 열교 차단을 위한 단열공법 개발
박철용 ( Park Cheol-yong ),김웅회 ( Kim Woong-hoi ),이상희 ( Lee Sang-hee ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
Internal Insulation system is applied to the most apartment building in Korea. However due to the importance of building energy enhanced the interest of the exernal insulation system. The extermal insulation system has better thermal performance because the thermal bridge through the structure are rarely formed. But the thermal bridge around the window decrease the thermal performance of the envelope system. Therefore the technology for reducing the thermal bridge around window improves energy efficiency of the building. In order to this it is necessary to minimize the thermal bridge around window of building. In this study it is aimed to minimize the thermal bridge around the window of building. It was confirmed that the use of thermal bridge barrier imporved the heat transfer rate by 64% or more and the condensation reduction phenomenon by 42% or more compared with the exist technology. These thermal bridge barrier will be used as the main technology to improve the energy efficiency of building.
건축물 창틀 주위 열교 및 결로 방지를 위한 열교 차단재 개발 및 성능 연구
박철용(Park, Cheol-Yong),김웅회(Kim, Woong-Hoi),권영철(Kwon, Young-Cheol) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.1
Zero energy building(ZEB) is a hot topic. In order to implement ZEB, external insulation is applied that can minimize thermal bridges on the opaque wall, but we are indifferent to the lack of insulation around the window. The purpose of this study is to analyze the decrease effectiveness of the linear thermal transmittance of L-shaped thermal bridge breaker that can prevent heat loss and internal condensation due to insulation defects resulted from finishing work around the window. By applying thermal bridge breaker around the window, we found out 63% decrease in linear thermal transmittance from 2D heat transfer analysis, 52% decrease in Equivalent U-value from the actual size plant experiment, and 50% decrease in TDR through a condensation test. It was confirmed by thermal video system that outdoor surface temperatures of a residential building were lower around 1℃ and its indoor surface temperature were 2℃ higher thanks to the L-shaped thermal bridge breaker, which indicates that condensation prevention performance is improved.