• Research Article

    Improvement Plan of Airtight Performance in PC Modular House according to Passive House Standard

    패시브 하우스 표준에 따른 PC 모듈러 주택의 기밀 성능 개선 방안 연구

    Chung, Joon-Soo, Lim, Seok-Ho, Seol, Wook-Je, Lee, Keon-Ho

    정준수, 임석호, 설욱제, 이건호

    Compared to Concrete-type houses, lightweight modular houses are assembled with members of various materials, sizes, and shapes, so many joints occur. Accordingly, … + READ MORE
    Compared to Concrete-type houses, lightweight modular houses are assembled with members of various materials, sizes, and shapes, so many joints occur. Accordingly, the modular house has a structure vulnerable to airtight performance. Therefore, securing airtightness performance in a modular house is one of the most important factors determining the physical quality. The airtight performance of the modular house with infill type completed in May was analyzed through the blow door test KS L ISO 9972 (Thermal performance of buildings - Determination of air permeability of buildings - Fan pressurization method). Based on the results, the structural causes of the deterioration of the airtight performance of the constructed modular were analyzed. As a follow-up, a new alternative for the airtightness improvement will be proposed based on the German passive house standard. - COLLAPSE
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    28 February 2023

  • Research Article

    Methodology of a Numerical Analysis Method for Natural Convection with Conjugate Heat Transfer

    전도체 주변 자연대류 현상 모사를 위한 복합열전달 수치해석 방법 개발

    Lee, Ju-Hee, Lee, Yong-Jun

    이주희, 이용준

    In the fields of architecture, machinery, and electronics, engineering problems frequently includes heat transfer phenomena that the energy is transferred from a … + READ MORE
    In the fields of architecture, machinery, and electronics, engineering problems frequently includes heat transfer phenomena that the energy is transferred from a high-temperature solid to a fluid. In order to precisely simulate the problem of heat exchange, a thermal analysis between solid and fluid should be performed not separately but simultaneously. In this study, we developed the code to calculate temperature and flow. For the fluid-solid calculation, the work of separating the fluid and the solid domains, and the automatic creation of the interface between the fluid and the solid were performed. The result of the fluid calculation provides the boundary conditions for the solid temperature in each iteration. The analysis code was verified by comparing its results with the experiment on the natural convection. The three-dimensional problem with the cube as the heat source was analyzed by considering the fluid-solid interaction. - COLLAPSE
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    28 February 2023

  • Research Article

    A Study on the Utilization of New and Renewable Energy in Nano Hydropower Generation System Using Building Drainage

    건축물 배수를 이용한 초소수력 발전시스템의 신·재생에너지 활용에 관한 연구

    Park, Min-Yong, Jung, Yeon-Tae

    박민용, 정연태

    Due to the high energy use and greenhouse gas emissions in the building sector, the government recently revised its 2030 GHG reduction … + READ MORE
    Due to the high energy use and greenhouse gas emissions in the building sector, the government recently revised its 2030 GHG reduction roadmap, raising the reduction rate from 18.1% to 32.7% compared to the BAU. However, although the new and renewable energy sources under the Act on Promoting the Development, Use, and Distribution of New and Renewable Energy can be considered to be diverse in 12 fields, in fact, the application to buildings in the new and renewable energy facility system is currently limited to only 7 fields due to the recent addition of small wind power. Therefore, it is necessary to create a market for new and renewable energy for various applications in buildings. Accordingly, in this study, as the obligation of zero-energy buildings approaches, we will approach the possibility of using the electric energy produced through horizontal drainage wheels by using the drop of drainage energy infinitely from the drainage pipe in the building. - COLLAPSE
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    28 February 2023

  • Research Article

    Heating Energy Savings Analysis of Bypass Mode of a PVT-Air Coupled ERV

    PVT-Air 연결식 ERV의 바이패스 모드 난방 에너지 절감 효과 분석

    Kim, Chang-Hwan, Choi, Jae-Sol, Oh, Min-Seok, Kim, Gi-Cheol, Kim, Eui-Jong

    김창환, 최재솔, 오민석, 김기철, 김의종

    As PV power generation efficiency degrades according to an increase in cell temperatures, overall energy saving effects can be anticipated by using … + READ MORE
    As PV power generation efficiency degrades according to an increase in cell temperatures, overall energy saving effects can be anticipated by using air type PVT and connecting the heated air from the PVT into an energy recovery ventilator (ERV). For such application, a ERV bypass mode can be applied to maximize energy saving effects during the heating period. The proposed system and corresponding control methods were compared to a reference case using TRNSYS simulation. A classroom equipped with typical electric heat pumps, ERVs, and ten PVT modules was simulated. Results showed that the proposed system reduced EHP energy consumption by more than 9% and improved PVT power production by more than 5%. Particularly, higher saving effects were found for the proposed bypass mode control than for the case of common ERV control. - COLLAPSE
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    28 February 2023

  • Research Article

    CFD Matching Algorithm for BIM Attribute Data based on String Similarity Using Levenshtein Distance

    Levenshtein Distance를 활용한 문자열 유사도 기반의 BIM 속성정보 CFD 매칭 알고리즘

    Lee, Min-Hyung, Seo, Min-Jeong, Eom, Mi-Hyeon, Park, Chang-Young, Choi, Chang-Ho

    이민형, 서민정, 엄미현, 박창영, 최창호

    For attribute data matching between BIM and CFD, this study proposed a BIM attribute information matching algorithm based on string similarity using … + READ MORE
    For attribute data matching between BIM and CFD, this study proposed a BIM attribute information matching algorithm based on string similarity using levenshtein distance. Considering the versatility of BIM and CFD models, algorithms were developed for IFC and OpenFOAM, which are open-source technologies. The algorithm consists of three modules. First of all, BIM attribute data extraction algorithm was established to extract attribute information from BIM. In addition, in order to input CFD of accurate property information, a database of property information on building materials was established. To implement a matching algorithm based on string similarity, the levenshtein distance algorithm, which calculates the editing distance between two strings, was applied. A matching algorithm was designed to convert the edit distance to similarity and input the attribute data of the selected optimal material to the CFD model. The attribute data of the material with the highest degree of similarity was input into the CFD model. Validation of the developed algorithm was conducted to evaluate the accuracy. As a result of validation, the BIM attribute information extraction algorithm was evaluated with an accuracy of about 99.1%. The matching algorithm accurately matched all materials belonging to the IFC to the CFD model. Therefore, the accuracy of the algorithm proposed in this study was validated. - COLLAPSE
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    28 February 2023

  • Research Article

    Study on Energy-saving Strategies of Rural Housing in Shandong Province of China

    중국 산동성 농촌주택의 에너지절약 방안에 관한 연구

    Shen, Qian , Wu, Jindong, Lee, Tae-Cheol, Yoon, Seong-Hwan

    선첸, 오금동, 이태철, 윤성환

    Most of the rural houses in Shandong Province are non-insulated buildings, which consume a lot of energy and reduce the indoor comfort. … + READ MORE
    Most of the rural houses in Shandong Province are non-insulated buildings, which consume a lot of energy and reduce the indoor comfort. To improve the indoor thermal environment of rural houses in Shandong while reducing energy consumption, this paper redesigned different energy-saving strategies according to the insulation materials provided in the Technical Guidelines. Using DesignBuilder, the energy-saving strategies were simulated. The energy-saving strategies were optimized and adjusted by comparing and analyzing the heating and cooling energy consumption results. The ceiling and external wall strategy is still the best cost-effective solution for economic consideration. Which will be used as a basis for future research to find more suitable insulation strategies for existing rural buildings in northern China. - COLLAPSE
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    28 February 2023
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