• Research Article

    Investigation of the Filtration Efficiency in Heat Recovery Ventilation System

    열회수형 환기설비의 필터 여과 효율 평가에 관한 연구

    Jeong, Han-Ung, Kang, Kyung-Mo

    정한웅, 강경모

    Fine dust particles are deposited in the human body through various mechanisms, leading to adverse health effects. The behavior of these particles … + READ MORE
    Fine dust particles are deposited in the human body through various mechanisms, leading to adverse health effects. The behavior of these particles varies with their size. This study examines the performance and filtration efficiency of heat recovery ventilators (HRVs) with filters in residential buildings through field measurements. By analyzing particle removal efficiency, it was found that operating a ventilator with a Case 1 (40%) filter increased indoor fine dust concentration compared to when the ventilator was off. Conversely, filters in Case 2 (90%) and Case 3 (99.5%) effectively controlled fine dust concentration. Performance degradation was observed as follows: Case 1: 39.2%, Case 2: 15.1%, and Case 3: 13.5%. As filtration efficiency increases there is a corresponding loss in ventilation rate by the HRV. Therefore when selecting filters for HRV, it is necessary to consider both ventilation rate and filtration efficiency simultaneously. - COLLAPSE
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    30 October 2024

  • Research Article

    Analysis of the Impact of Extended Data Point Measurement Time on Uncertainty in the Blower Door Test

    블로어도어 실험의 데이터 포인트 측정시간 연장에 따른 불확도 영향 분석

    Choi, Ji-Hoon, Kim, Ji-Hye

    최지훈, 김지혜

    Uncontrolled air leakage through windows and cracks in buildings is referred to as infiltration, which leads to increased heating and cooling energy … + READ MORE
    Uncontrolled air leakage through windows and cracks in buildings is referred to as infiltration, which leads to increased heating and cooling energy consumption and deteriorates indoor air quality. The airtightness performance of a building is primarily evaluated using the pressurization method with a blower door, and the reliability of this evaluation is determined by the flow exponent(n) and the coefficient of air leakage (CL) derived from the test. However, blower door tests are subject to variability in measurements due to factors such as external wind speed and indoor-outdoor temperature differences. So, previous researchers have extended the measurement time of Zero-flow pressure difference or proposed new regression methods such as Weighted Line of Organic Correlation (WLOC) and Iterative Weighted Least Squares (IWLS) to reduce measurement uncertainty. This study analyzed how extending the measurement time of data points and applying WLOC improves the reliability of airtightness measurements. - COLLAPSE
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    30 October 2024

  • Research Article

    Performance Analysis of Control Strategy for the Cooling Tower Assisted Hybrid Ground-Source Heat Pump System

    냉각탑 기반 하이브리드 지열 히트펌프 시스템을 위한 제어 전략의 성능 분석

    Lee, Young-Ae, Kim, I-Re, Lee, Yee-Jin, Baek, Seung-Hyo

    이영애, 김이레, 이예진, 백승효

    A hybrid ground-source heat pump system has advantages of reducing initial cost of the ground-source heat pump and improving energy efficiency for … + READ MORE
    A hybrid ground-source heat pump system has advantages of reducing initial cost of the ground-source heat pump and improving energy efficiency for the long-term operation. To effectively utilize the system, an appropriate control strategy is needed. This study thus investigated the performance of control strategies for a cooling tower assisted hybrid ground- source heat pump system. Three control strategies were analyzed: EWT-based FET, wet bulb temperature-based FTD, and schedule-based FRT. The building, the system and each control strategy were modeled by TRNSYS 18 and energy consumption by each control strategy were also calculated. The results showed that FTD strategy is the most effective in reducing energy consumption. Apart from the control algorithm, it was also found that in order to increase the efficiency of hybrid ground-source heat pump systems, it is helpful to increase the operating time of the cooling tower to reduce the proportion of the thermal load by the underground heat exchanger. - COLLAPSE
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    30 October 2024

  • Research Article

    Development of IDC Energy Consumption Predicted Model by Control Conditions using AI

    인공지능을 활용한 Internet Data Centre의 제어조건별 에너지사용량 예측 모델 개발

    Go, Su-Min, Park, Hyung-Eun, Song, Young-Hak

    고수민, 박형은, 송영학

    Currently, most of the fluid-related elements such as chilled water, condensing water, and air volume of the internet data centre HVAC system … + READ MORE
    Currently, most of the fluid-related elements such as chilled water, condensing water, and air volume of the internet data centre HVAC system are operated at fixed values ​​annually or seasonally, which causes a decrease in energy efficiency. Therefore, it is necessary to establish a control method that minimizes energy usage by controlling the chilled water and condensing water temperature according to the outdoor air temperature. A model to predict energy usage was developed for efficient control of the entire system. Through PCC (Pearson Correlation Coefficient) analysis, elements affecting energy usage were selected as control variables, and energy usage at each temperature was derived by varying the chilled and condensing water temperature. Afterwards, a prediction model was developed using the results, and it was confirmed that the reliability was secured as CV (RMSE) was 2.19%, NMBE was 0.024%, MAPE was 0.72%, and R2 was 0.885. - COLLAPSE
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    30 October 2024

  • Research Article

    Ventilation Fan Capacity for Appropriate Fire Smoke Exhaustion in Underground Utility Tunnel

    지하 공동구 내 화재 발생 시 적정 배연을 위한 환기 팬 용량 설계

    Cho, Yun-Woo, Cho, Jeong-Hwa, Lee, In-Bok, Jung, Woo-Sug

    조윤우, 조정화, 이인복, 정우석

    Underground utility tunnels manage essential public infrastructure of urban such as electricity, water supply and telecommunication, so disasters such as fire and … + READ MORE
    Underground utility tunnels manage essential public infrastructure of urban such as electricity, water supply and telecommunication, so disasters such as fire and explosion to the underground utility tunnel can severely damage not only urban facilities but also urban life. Because of characteristics of underground structure, heat and smoke are not quickly discharged when fire disaster occurs. It makes it difficult to evacuate refugees and enter firefighters. Therefore, it is necessary to prepare initial reaction after fire disaster to minimize the damage. So, in this study appropriate capacity of the exhaust fan for effective smoke emission was selected. To select proper capacity of exhaust fan, target underground utility tunnel was divided into each section and assumed that fire occurred in each section. After smoke diffusion was simulated, and analyze whether smoke was adequately discharged by exhaust fan. This results can be used as a manual for effective initial fire suppression in the underground utility tunnel. - COLLAPSE
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    30 October 2024

  • Research Article

    Evaluation of the Impact of Wooden Remodeling on Indoor Environmental Improvement in Aging Buildings

    목질화 리모델링 적용에 따른 노후 건축물의 실내 환경 개선 효과 평가

    Park, Hae-Deun, Byeon, Ji-Yeong, Lee, Yeon-Hwi, Kim, Jeong-Kook, Chang, Seong-Jin

    박해든, 변지영, 이연휘, 김정국, 장성진

    This study examines the impact of indoor wooden remodeling on air quality and energy consumption in aging buildings. Indoor air quality was … + READ MORE
    This study examines the impact of indoor wooden remodeling on air quality and energy consumption in aging buildings. Indoor air quality was evaluated based on the Ministry of Environment’s Indoor Air Quality Management Act, measuring parameters such as total volatile organic compounds (TVOC, AVOC, BVOC), formaldehyde (HCHO), total airborne bacteria (TAB), and particulate matter (PM2.5). Results showed a significant increase in BVOC and PM2.5 levels after remodeling, attributed to the residual effects of wood materials. While TVOC levels decreased four weeks post-remodeling in Cheonan, they increased in Jinju due to inadequate ventilation, highlighting the need for regular cleaning and ventilation after construction. Building energy consumption was analyzed using DesignBuilder, comparing different levels of wood application (7.4%, 100%) with no remodeling. Energy savings were observed, with up to a 4.4% reduction in energy use for fully remodeled buildings, while the actual remodel yielded a 1.3% reduction. The study concludes that wooden remodeling not only enhances indoor air quality but also improves energy efficiency, demonstrating wood’s potential as a sustainable building material for future remodeling. - COLLAPSE
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    30 October 2024

  • Research Article

    Analysis of Hygrothermal Stability of Lightweight Wooden Structure with External Insulation

    외단열 경량목구조 벽체의 Hygrothermal 안정성 분석

    Lee, So-Min, Lee, Jeong-Hun

    이소민, 이정훈

    To reduce energy consumption and enhance energy efficiency in buildings,Exterior insulation and finishing system (EIFS) that meet strengthened insulation standards are being … + READ MORE
    To reduce energy consumption and enhance energy efficiency in buildings,Exterior insulation and finishing system (EIFS) that meet strengthened insulation standards are being increasingly applied. In lightweight wooden Structure, there is a growing trend of filling the spaces between the studs of 2x6 wood frames with glass wool and adding EPS as external insulation. Even with identical construction methods, defects may arise due to the climatic characteristics of the construction site. Therefore, the appropriate application of insulation materials that consider regional climate conditions is essential. Since wood is vulnerable to moisture, designing building envelopes that take climatic factors into account is essential. This study adjusts the Water vapor diffusion resistance coefficient of various insulation materials to propose material properties suitable for different regional climates and analyzes the risk of mold growth. - COLLAPSE
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    30 October 2024
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