• Research Article

    Survey Method of Light Weight Impact Sound Isolation Performance for the Quality Control of Floor Impact Sound Isolation System

    바닥 충격음 차단구조의 품질 관리를 위한 경량 충격음 차단성능 간이 측정방법

    Jeong, Jeong-Ho, Lee, Sung-Chan, Hong, Joo-Young

    정정호, 이성찬, 홍주영

    In order to improve the floor impact sound isolation performance of the apartment buildings, it is necessary to develop an effective isolation ... + READ MORE
    In order to improve the floor impact sound isolation performance of the apartment buildings, it is necessary to develop an effective isolation structure, and a quality control method to reduce level difference between apartment units where the isolation structure installed. To minimize the level difference between units, it is necessary to develop a construction quality control technique and acquire a related database. For controlling construction quality in the field condition, it is necessary to use a simple measurement method. In this study, a survey method for light-weight impact sound based on ISO 10052 was suggested and compared the results with KS F 2810-1 measurement results. The suggested survey method was to measure transmitted sound in the center position of the lower receiving room and impact the center position and center position with one or two more boundary position. As a survey method of light-weight impact sound, it was found that averaged level of center + one boundary position, or center to center method was useful in field condition. The level differences between the two survey methods were estimated to be ± 1.3 dB and ± 2 dB, respectively. - COLLAPSE
    February 2019
  • Research Article

    Derivation of Regression Equations for Illuminance Ratio of Work Plane and Ceiling Surface with Wall Reflectance

    벽체 반사율에 따른 작업면과 천장면의 조도 비율 회귀식 도출

    Seo, Jae-Yoon, Rhee, Kyu-Nam, Jung, Gun-Joo

    서재윤, 이규남, 정근주

    The dimming control of the indoor lighting requires for detecting or predicting the work plane illuminance. However, it is difficult to install ... + READ MORE
    The dimming control of the indoor lighting requires for detecting or predicting the work plane illuminance. However, it is difficult to install the illuminance sensor on the work plane due to objects and/or occupants in the room. In order to overcome this problem, the illuminance sensor is installed on the ceiling surface. In this case, the illuminance ratio of the work plane to the ceiling is an important factor in the dimming control. The illuminance ratio is affected by many factors such as the shape of the room, the type and brightness of the light, the reflectance of the wall and the floor, and the interior objects. The research analyzed the relationship between the illuminance ratio and the reflectance of the wall in a typical small office model space, which was built to evaluate the dimming control. To do this, simulation model was developed using Relux and was validated with the mock-up tests. Simulation results revealed that the average illuminance ratio (Y) according to the wall reflectance (X) was Y=0.1243X2 + 0.1534X + 0.1169 (R2=0.9993). It was found that the illuminance ratio at the central part of the model space was low because the illuminance of the central part of the work plane was higher than that of the side of room. The results of this study could be utilized to determine the appropriate position of illuminance sensor when designing the dimming control system. - COLLAPSE
    February 2019
  • Research Article

    Study on Energy Performance Evaluation and Application of Renewable Energy in Rural Village Homes

    농촌마을 주택의 에너지 성능평가 및 재생에너지 적용 방안에 대한 연구

    Kim, Jung-Seok, Jeon, Sang-Soo, Shin, Seung-Wook, Park, Mi-lan, Ju, Jung-Min

    김정석, 전상수, 신승욱, 박미란, 주정민

    According to the 'Renewable Energy 3020 Implementation Plan' in the Ministry of Trade, Industry and Energy, renewable energy accounts for 7% of ... + READ MORE
    According to the 'Renewable Energy 3020 Implementation Plan' in the Ministry of Trade, Industry and Energy, renewable energy accounts for 7% of total electricity generation by 2016. It plans to expand renewable energy to 20% by 2030. The 48.7 GW of renewable energy will be installed to success clearly this project and the 10 GW of renewable energy should be supplied at rural areas. The Agricultural Land Act has been amended to install photovoltaic facilities in reclaimed land and reservoirs in the agricultural promotion zone. In addition, the government is considering ways to utilize idle state property such as the roofs of home, shared building, and shared warehouse. The rural area is the most likely to be considered in the promising renewable energy supply sector. Therefore, it is necessary to evaluate the energy performance of the buildings in rural areas and to improve the applicability of renewable energy. - COLLAPSE
    February 2019
  • Research Article

    Visual Environment Performance Evaluation of Indoor Louver Type Concentrating Daylighting System on the Spatial Unit

    실내 루버형 집광채광시스템의 공간단위 시환경 성능 평가

    Shin, Sang-Yong, Rim, Min-Yeop, Sung, Uk-Joo

    신상용, 임민엽, 성욱주

    Indoor louver type concentrating daylighting system was emerged as a new item in the process to increase the power supply from renewable ... + READ MORE
    Indoor louver type concentrating daylighting system was emerged as a new item in the process to increase the power supply from renewable energy in buildings. In this study, the daylighting system is evaluated performance on the visual environment side. The cases for the visual environment evaluation were classified into total twelve type, including three types of rotation angle of slat, two types of the width of the slats and whether the daylight concentration side (reflection) is perforated or not. Visual environmental performance of each case is evaluated to external environmental conditions favorable to daylighting according to the indoor visual environment comfort index (average illuminance, uniformity, DF, DA, luminance contrast). Most of the cases satisfied the visible environmental criteria in terms of illumination the glare criteria except for the concentrator. Detailed construction methods and performance criteria are required to minimize glare in the collection and collection of the concentrating daylighting system, and modify condition of exterior environmental conditions and indoor illuminance. - COLLAPSE
    February 2019
  • Research Article

    A Proposal for Optimal Liquid Solar and Thermal Systems (L-PVTs) and Analysis of Seasonal Energy Production

    액체식 태양광·열 시스템(L-PVTs) 최적안 제안 및 계절별 에너지생산량 분석

    Kim, Yun-Ho, Dai, Lucheng, Bae, Sang-Mu, Nam, Yoo-Jin, Hwang, Jung-Ha

    김윤호, 다에루청, 배상무, 남유진, 황정하

    Recently, South Korea has been encouraging the expansion and distribution of renewable energies to reduce the consumption of fossil fuels which is ... + READ MORE
    Recently, South Korea has been encouraging the expansion and distribution of renewable energies to reduce the consumption of fossil fuels which is the cause of greenhouse gas emissions. This study suggests a PVT system with optimized efficiency and analyzes the energy production characteristics using the TRNSYS17 program for the application and commercialization of an optimal photovoltaic thermal (PVT) system that simultaneously produces electrical and thermal energies while possessing a higher energy production rate per installed area compared to conventional photovoltaic and solar thermal energy systems. The proposed system was applied to a building to analyze the energy production in each season. This study was performed in the following steps. First, the components of the PVT system and the environmental variables affecting the energy production were examined through an analysis of previous studies. Second, the energy production from each component of L-PVTs was calculated and compared using TRNSYS. Based on the results, the optimal PVT system was proposed by combining the most efficient components. Third, the energy production of the proposed L-PVTs was calculated and compared according to the ambient temperature, solar radiation and the inlet temperature. Fourth and last, the target building was selected and the suggested L-PVT was applied to it. Then the energy production in each season was calculated by performing energy analysis. - COLLAPSE
    February 2019
  • Research Article

    A Study on U-value Variations of Fixed Windows according to the Window Size Variations

    창호 크기 변화 시 고정창 열관류율 변화에 관한 연구

    Mun, Jung-Hyon

    문정현

    In this paper, U-value variations of a fixed window were analyzed qualitatively and quantitatively. The factors which influence the U-value variation of ... + READ MORE
    In this paper, U-value variations of a fixed window were analyzed qualitatively and quantitatively. The factors which influence the U-value variation of a window when the window size changes are the ratio of the frame U-value to the glass U-value and the ratio of the frame size to the window size. The ratio of the frame size to the window size increases when the window size increases and the frame width is fixed. In this study, when the window size varies and the frame width is fixed, the effect of the ratio of the frame U-value to the glass U-value on the U-value variations of the window were investigated. The calculation of window U-value consists of the u-value calculation for the glass and frame and that at glass edge. When the window size varies, the U-value variation for the glass and frame and that of the edge of glass should be investigated together. When the ratio of the frame U-value to the glass U-value is bigger than 1 and the window size decreases, the U-value for the glass and frame increases against that of the standard test window. The U-value for the edge of glass increases when the window size decreases from that of the standard test widow. Therefore, if the frame U-value is bigger than the glass U-value and the window size is smaller than the standard test case, the U-value difference of the glass and frame and that of the edge of the glass from that of the standard test window are piled up together. - COLLAPSE
    February 2019
  • Research Article

    Development of a Design Tool for Hydronic Piping Systems and Evaluation of Practicability

    건물 냉난방 수배관시스템 설계 프로그램의 개발 및 실무 활용가능성 평가

    Oh, Ju-Hong, Kim, Eui-Jong, Jang, Mun-Ki, Kim, Sung-Min

    오주홍, 김의종, 장문기, 김성민

    A design tool is proposed that can describe whole hydronic pipelines of a building and thus allows for detailed sizing of piping ... + READ MORE
    A design tool is proposed that can describe whole hydronic pipelines of a building and thus allows for detailed sizing of piping components. Since a rule-of-thumb method is commonly used in design companies and existing design softwares are not trivial to handle, an intuitive modeling method is implemented in AutoCAD by developing a user-friendly add-on program. Then, a similar calculation algorithm to existing tools is applied using detailed fluid and valves characteristics. Various solutions can be found during simulations that search for proper pipe diameters, valve sizes, and the required pump head among device databases. To validate the proposed tool, a test case is inter-simulated using both the existing Hyselect design program and the traditional rule-of-thumb design method. As a result, the resulting pipe diameter and pump head are highly overestimated with the traditional design method. On the other hand, the proposed model can result in very similar pipe diameter and pump head compared to Hyselect, showing an error of less than 2%. - COLLAPSE
    February 2019
  • Research Article

    A Fundamental Study on the Field Measurement Method of Dynamic Stiffness of Resilient Materials used for Floor Impact Sound Insulation

    바닥충격음 완충재의 동탄성계수 현장 측정방법에 관한 기초적 연구

    Song, Guk-Gon, Lee, Won-Hak, Kim, Yong-Hee, Ryu, Jong-Kwan

    송국곤, 이원학, 김용희, 류종관

    This study is a fundamental study on the method of measuring the dynamic stiffness of the resilient material for floor impact sound ... + READ MORE
    This study is a fundamental study on the method of measuring the dynamic stiffness of the resilient material for floor impact sound reduction at the construction site. The resilient material is one of the factors which greatly influencing the floor impact sound performance of the apartment house. This study tried to find a method to measure the dynamic stiffness of the resilient material directly in the field. The results of the measurements in the laboratory condition were compared with those in the non - trimmed condition at the concrete slab. And, the dynamic stiffness of the cement mortar load plate preliminarily prepared on the resilient material was measured and compared with the laboratory measurement results. As a result of the measurement, it was confirmed that the measurement of dynamic stiffness is possible because there is little difference between the measurement result using the steel load plate on the steel base plate in laboratory and on the concrete slab. The dynamic stiffness measured by the cement mortar loading plate on the concrete slab was different from the laboratory results, which is considered to depend on the weight per unit area of the load plate. In the future, it is possible to confirm the dynamic stiffness of the resilient material before construction of the resilient material at the construction site of the apartment building by deriving the correction value calculation formula by confirming the changing trend in the dynamic stiffness measurement result by the weight per unit area of the load plate. - COLLAPSE
    February 2019
Journal Informaiton Agriculture and Life Sciences Research Institute Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
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