• Research Article

    Evaluations of Vibration Serviceability for Two Structural Types of Modular House

    2종류의 구조형식이 적용된 강재 모듈러 공동주택의 진동 사용성 평가

    Lee, Eun-Jin, Lee, Min-Jung, Hyoun, Chang-Kook

    이은진, 이민정, 현창국

    The evaluations of vibration serviceability for two structural types of modular house were conducted in this study. The subject modular house was ... + READ MORE
    The evaluations of vibration serviceability for two structural types of modular house were conducted in this study. The subject modular house was designed and constructed using two structural types of modular system: infilled and stacked structure. According to previous study and the pilot survey on surrounding environment, traffic-induced vibration was considered as the main vibration source. In addition to traffic vibration, heel impact during a occupant’s walking on the upper floor was adopted as meaningful vibration source. The vibration levels from acquired data are amplified in the frequency range from 10 Hz to 20 Hz for two types of modular houses. And the vibration levels for two vibration sources satisfied the serviceability limit of ISO 10137 in both structural types of modular house. - COLLAPSE
    April 2021
  • Research Article

    A Study on the Reduction of PM10 in a Line-Type School Meal Service Facility

    학교내 일렬형 배치 급식시설의 미세먼지 저감방안에 관한 연구

    Cha, Dae-O, Hwang, Jung-Ha

    차대오, 황정하

    In this study, single day PM10 concentrations were measured for a Line-type school meal service facility. PM10 concentrations generated by cooking and ... + READ MORE
    In this study, single day PM10 concentrations were measured for a Line-type school meal service facility. PM10 concentrations generated by cooking and other student activities were measured and analyzed. The analysis results were used as an input for a simulation to examine the existing exhaust hood and Air Handling Unit (AHU) were in operation [EXT], and for other cases in which alternative measures were initiated for PM10 reduction in the kitchen and cafeteria, such as installation of an additional exhaust hood [ALT-1], cafeteria zoning [ALT-2], and installation of a waste heat recovery ventilation unit [ALT-3]. The simulation results of PM10 concentration distributions for each reduction measure were compared with the results of [EXT]. It was observed that the PM10 reduction efficiency of [ALT-1] was 1.4% in both kitchen and cafeteria, 17.8% in the kitchen and 23.9% in the cafeteria for [ALT-2], and 49.3% in the kitchen and 61.9% in the cafeteria for [ALT-3]. - COLLAPSE
    April 2021
  • Research Article

    Proposal of Information System for Calculating the Clear Width of Barrier Free Certification based on openBIM

    개방형 BIM기반 장애물 없는 생활환경 인증의 통과 유효폭 산출을 위한 정보체계 제안

    Lee, Yong-Ha, Kim, Chang-Min, Park, Chang-Young, Jang, Hyang-In

    이용하, 김창민, 박창영, 장향인

    In the pedestrian environment such as main entrance, ramp, stair etc., the clear width of passage is one of the important factors ... + READ MORE
    In the pedestrian environment such as main entrance, ramp, stair etc., the clear width of passage is one of the important factors. It is required by various laws and certifications at domestic and overseas and is considered as a major influencing factor in evacuation plan, traffic management. Currently, in Korea, review of this item is required in the ‘Act on Convenience Facilities for the Disabled’ and ‘Barrier Free Certification’. As the evaluation items include not only general facilities but also facilities for the disabled, identification measures for each target are required for precise evaluation. Therefore, this study classified facilities for the disabled by using the object/geometry/attribute information of the BIM model, and intends to present the information system of the attribute information and the geometry information accordingly. In order to prepare the basis for the openBIM-based clear width review automation, the required information was extracted through the analysis of the clear width items. Based on the extracted items, the research scope was set at the level of information that can be expressed within BIM. In addition, input and output methods of IFC and commercial BIM authoring tools and information exchange processes are proposed. Based on the derived information, an IFC-based required information mapping system was derived, and the information system of the required information for the BIM-based clear width review was shown. - COLLAPSE
    April 2021
  • Research Article

    Development of a Machine Learning-based Low-rise Residential Building Energy Consumption Prediction Model

    머신러닝기반 저층 주거 건물 에너지소요량 예측 모델 개발 - 단독주택, 다세대, 연립주택을 대상으로

    Yoo, Dong-Chul, Kim, Kyung-Soo, Choi, Chang-Ho, Cho, Sung-Eun, Jang, Hyang-In

    유동철, 김경수, 최창호, 조성은, 장향인

    The purpose of this study is to develop a prediction model that can evaluate energy consumption before and after remodeling through a ... + READ MORE
    The purpose of this study is to develop a prediction model that can evaluate energy consumption before and after remodeling through a reference model for low-rise residential buildings for which energy simulation evaluation is difficult due to its aging. Specifically, a prediction model to evaluate various building elements before remodeling and a model to predict savings due to the application of energy-saving technology were developed. For the objective, the energy simulation analysis of a building was performed using DesignBuilder per reference area of ​​a Detached house, Multi-family house, and Row House. In addition, the significance of machine learning was compared and analyzed by using R2, MSE, RMSE, CVRMSE indicators and Python’s linear regression, random forest, and neural network. As a result of this analysis, both the model to evaluate the status before remodeling and the model to evaluate the reduction rate according to the energy-saving technology after remodeling showed a high determination coefficient of 0.9 or more for the neuron network. The CVRMSE was analyzed as low as 15% or less. As this is less than the index used in the M&V evaluation presented in the ASHRAE Guideline 14, it was verified that there is a statistical significance. Therefore, this aims to contribute to the basic data and green remodeling promotion project in the energy performance improvement project for the old, private low-rise residential buildings and also in the energy-saving evaluation for buildings. - COLLAPSE
    April 2021
  • Research Article

    Investigation of the Effects of Sensor Fault on the Performance of Solar Hot Water Systems

    센서 고장에 따른 태양열 급탕 시스템 성능 분석

    Baek, Seung-Hyo

    백승효

    The application of Solar Hot Water (SHW) systems is essential for implementing zero-energy buildings. Various faults in these systems, however, can cause ... + READ MORE
    The application of Solar Hot Water (SHW) systems is essential for implementing zero-energy buildings. Various faults in these systems, however, can cause performance degradation, which has led some HVAC engineers or building facility managers to avoid applying such systems. In particular, detection of sensor faults is more difficult than detection of other types of faults. Accordingly, the present study investigates the effects of sensor faults on the performance of SHW systems. Negative and positive biases are artificially injected into the system, and the performance of fault-free and faulty conditions are compared by TRNSYS 17. The simulation results demonstrate that negative bias causes a decrease in solar heat gain in the system. In addition, it is found that the system is operated more intermittently in a negative bias condition and more continuously in a positive bias condition. This finding can be effectively used to propose fault detection and diagnosis in SHW systems. - COLLAPSE
    April 2021
  • Research Article

    Research on Energy Management Methods and Cases - Focusing on the Planning and Operation Phase Methods in Large-scale Complex Buildings in Japan

    에너지 매니지먼트 방법과 그 사례에 관한 연구 - 일본의 대규모 복합건물에서의 설계, 운용단계 수법을 중심으로

    Lee, Chee-Woo

    이치우

    The study proposed a method of improving the energy performance of a building in the development of a large-scale complex. In this ... + READ MORE
    The study proposed a method of improving the energy performance of a building in the development of a large-scale complex. In this study, a specific energy-saving method is proposed based on the case of a building in a large complex in Japan, which accomplished a high-efficiency energy performance by conducting energy management consistently from the planning stage to the operating stage. Specifically, the major energy-saving features of this facility are as follows. 1) High-efficiency district heating and cooling (DHC) energy system. 2) Energy data collection system for energy management. 3) Construction of energy management system based on the coordination between the building group and DHC business operators. 4) Energy management through energy data analysis using Building Energy Management System. Based on energy management, the achieved annual primary energy coefficient of performance (COP) was 1.35, which was the third highest among the DHCs in Japan. Furthermore, the COP has been continuously increasing after the completion of construction, and the cooling energy system showed an improvement of 10% over five years. This study quantitatively examined the energy management methods in the design and operating stages and their effects on a large-scale complex building, and demonstrated the significance of the energy management of energy savings for an entire building. - COLLAPSE
    April 2021
  • Research Article

    Measurement Analysis of Power Generation Change with Bidirectional Reflectance PV Array

    양반사 PV 어레이의 발전량 변화 특성에 관한 실측결과 분석 연구

    Lee, Keon-Ho, Kim, Su-Ji, Jeong, Jin-Woo, Song, Young-Hak

    이건호, 김수지, 정진우, 송영학

    Photovoltaics (PV) is one of the new and renewable energy types, which has a high design degree of freedom of device capacity ... + READ MORE
    Photovoltaics (PV) is one of the new and renewable energy types, which has a high design degree of freedom of device capacity due to the installation characteristics of module-level without making noise, and its application cases in buildings have increased. Moreover, a measure to increase power generation using sun location tracking and reflective plates has also been studied highly actively to overcome the limitation of efficiency of power generation modules and outdoor solar radiation. In this context, this study deals with the change in power generation in a bidirectional reflectance PV (BRPV) array, which uses reflected light on the surface by installing two PV modules at 90° position to each other. The single horizontal and vertical PV arrays and BRPV were installed at the rooftop of a building in the metropolitan city and each power generation was measured for one year from May in 2019. The increasing trend of power generation was found in the horizontal panel when the solar meridian altitude was increasing whereas the vertical panel power generation increased when the solar altitude angle was decreasing. The cumulative annual power generation showed that the horizontal array in the BRPV was the largest followed by a single horizontal array, BRPV vertical array, and single vertical array. In addition, the increase in power generation due to the reflected light effect of the BRPV array was verified as the solar altitude angle was lower as shown in a monthly increase of –0.3–20.1% and an annual average increase of 8.6% in the horizontal panel. The power generation from the vertical panel of the BRPV increased by 6.3–82.9% monthly and its power generation increased by 32.8% compared to that of the independent vertical panel annually. - COLLAPSE
    April 2021
  • Research Article

    Analysis of Energy Performance of Multi-Unit Dwelling by Household Plan Using the Building Energy Efficiency Rating Program

    건축물 에너지효율등급 평가 프로그램을 활용한 공동주택의 단위세대 에너지성능 분석

    Lee, Do-Hyung, Kim, Tae-Yeon, Seok, Jin-Hee, Byun, Soo-Young

    이도형, 김태연, 석진희, 변수영

    This study analyzed the primary energy consumption changes according to the variable conditions for each household type of multi-unit dwelling. As a ... + READ MORE
    This study analyzed the primary energy consumption changes according to the variable conditions for each household type of multi-unit dwelling. As a result of the analysis by household type, primary energy consumption decreased as the exclusive area increased. However, 59㎡ type has a larger A/V ratio than 46㎡ type, indicating that energy consumption is higher. According to the analysis by insulation criteria, the reduction in primary energy consumption was significant when the construction standards for energy-saving eco-friendly housing insulation, which is the insulation criteria in 2019, and the 2022 LH zero energy passive guidelines insulation was applied. The south-facing building orientation was the most advantageous, and as the number of floors increased, the A/V become smaller, and the primary energy consumption decreased. Overall, primary energy consumption decreased due to reduced light power density, but in some sections, primary energy consumption increased rather because heating energy increases are greater than lighting energy decreases. - COLLAPSE
    April 2021
  • Research Article

    The Analysis of Energy Performance for Certification Case of Zero Energy Building through Green Remodeling in Korea

    그린리모델링을 통한 제로에너지건축물 본인증 취득 사례건물의 에너지성능 평가

    Choi, Min-Joo, Jeon, Ji-Woon, Lee, Do-Hyung

    최민주, 전지운, 이도형

    As green remodeling was selected as one of the top 10 tasks of the Korean version of the Green New Deal, the ... + READ MORE
    As green remodeling was selected as one of the top 10 tasks of the Korean version of the Green New Deal, the “public building green remodeling project” is in progress. Currently, research on technology applied to green remodeling and energy performance improvement accordingly are being conducted in various fields, but it is difficult to find a case of energy performance improvement comparable to zero energy buildings. Therefore, this paper introduces the first case of acquiring the zero-energy building certification as the “public building green remodeling project”, and by comparing and analyzing the applied technology and the energy performance with the performance before remodeling, confirmed the energy-saving effect and the possibility of achieving zero-energy buildings through green remodeling. Various passive and active design techniques were applied to the target building. Through this, the energy consumption of 49.10% was reduced compared to before remodeling. An additional 40.58% of energy consumption was reduced through the new and renewable energy technology, and the Energy Self-Sufficient Rate was 79.27%. The target building acquired 30.3 kWh/m²·y of primary energy through green remodeling and obtained the building energy efficiency rating 1+++ grade and the zero energy building 3 grade. As a result of the application of passive, active, and renewable energy technology elements compared to before remodeling, annual energy prices were reduced from 6,617,136 won/year to 935,523 won/year, reduced 5,681,613 won/year. - COLLAPSE
    April 2021
  • Research Article

    Experimental Study on the Elevator Door Re-opening due to the Pressure Difference in Buildings

    건물에서의 압력차에 따른 엘리베이터문 재열림 발생 실험 연구

    Lee, Dong-Seok, Ji, Kyung-Hwan, Jo, Jae-Hun

    이동석, 지경환, 조재훈

    An elevator has become an essential element in the modern architectures, by means of transporting passengers and luggage efficiently. However, the pressure ... + READ MORE
    An elevator has become an essential element in the modern architectures, by means of transporting passengers and luggage efficiently. However, the pressure difference in buildings causes various problems in elevator operation such as functional disorder, noise, and equipment failure. This study investigates the limit of pressure difference that causes re-opening while the elevator door is closing. The mock-up test modelling air flow in an elevator hall was performed, and we found the pressure limit for the tested door. Two cases were set - the top floor elevator and the lobby floor elevator in heating mode. The pressure limit were 50 Pa for top floor and 40 Pa for lobby floor. The results show the elevator doors on the lobby floor were more vulnerable to an increase in pressure difference than on the top floor. - COLLAPSE
    April 2021
Journal Informaiton Journal of Korean Institute of Architectural Sustainable Environment and Building Systems Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
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