• Research Article

    A Study on Cooling Load Reduction of Building Insulation Package Considering Climate Condition in Vietnam

    베트남 기후를 고려한 건축 단열 패키지의 냉방부하 저감 성능에 관한 연구

    Choi, Min-Ho, Shin, Sang-Yong, Shin, Jae-Yoon, Sung, Uk-Joo

    최민호, 신상용, 신재윤, 성욱주

    In Vietnam, energy consumption in building sector is accounted for a large portion of the country's total energy use. Vietnam is ... + READ MORE
    In Vietnam, energy consumption in building sector is accounted for a large portion of the country's total energy use. Vietnam is currently implementing policies to reduce building energy consumption. However, Vietnamese building construction market is actively accepting imported technologies from oversea countries due to their limitations of domestic technologies in Vietnam. While Korean stakeholders in building sector are currently focusing on localizing high-level passive technologies to the oversea countries for exporting them. And also it needs to be verified in the same environmental condition of oversea climates. This study utilizes KS L 9107 to analyze the cooling load reduction effect of building insulation package considering Vietnamese climate, through the experiment, SHGC of building insulation package by solar radiation was compared and analyzed. In addition, the energy saving performance of buildings in Vietnam's climate conditions was analyzed through simulation. The insulated walls with solar reflected paint have a greater effect on the reduction of thermal transmittance under the environmental condition simulated as Vietnamese daytime than when only thermal reflective insulation is applied. In case of windows, the energy reduction performance of film blinds and glass-attached films are compared. The results show the energy reduction effect of the window films compared to the none - applied film curtain wall windows is greatly increased. Lastly, building energy simulation is conducted by applying wall and window technology already verified, the results show a cooling energy saving in building unit is about 10% compared to the existing technology under the Vietnamese climate condition. - COLLAPSE
    February 2020
  • Research Article

    Deriving Mean Radiant Temperatures According to the Methods of Measuring Indoor Surface Temperature

    실내 표면온도 측정 방법에 따른 평균복사온도 도출

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

    이동석, 지경환, 조재훈

    Among the physical variables regarding thermal conditions and heat stress, the determination of mean radiant temperature is a classic problem in the ... + READ MORE
    Among the physical variables regarding thermal conditions and heat stress, the determination of mean radiant temperature is a classic problem in the thermal environmental field. This study deals with the methods of calculating mean radiant temperature using surface temperatures and angle factors. Two measurement methods using contact thermometer (CT method) and infrared thermographic camera (IR method) have been applied for measuring indoor surface temperatures. The measurement has shown that the difference in surface temperature of the blinds measured by two methods have increased with a high difference of about 5°C. The result of the study reports that it is indecated that the method using a infrared thermographic camera is suitable in order to accurately derive the mean radiant temperature. - COLLAPSE
    February 2020
  • Research Article

    Measurements and Analysis of Floor Impact Sound through Field Test on the Apartment houses

    현장시험을 통한 공동주택 바닥충격음 차단성능 분석

    Lee, Won-Hak, Song, Guk-Gon, Haan, Chan-Hoon

    이원학, 송국곤, 한찬훈

    The present study investigates the change between preliminary accreditation system results and floor impact sound evaluation in the field. In order to ... + READ MORE
    The present study investigates the change between preliminary accreditation system results and floor impact sound evaluation in the field. In order to this, evaluation has been conducted at the construction phase before completion. The resilient materials used in the field are applied to the site using 1st grade of light-weight impact sound and 3rd grade of heavy-weight impact sound. The measurements are limited to households with extended living room, ceiling whit well type, and finishing materials with thickness of 7.5 mm. As a result, it was found that the difference between the performance of the resilient material through the preliminary accreditation system and the site evaluation at the pre-completion phase have been lowered by at least one grade. It was also revealed that there were about (1 ~ 5) dB deviations depending on the household's exclusive use area, the shape of the plan, the space to be measured, and the width and length ratio of the living room area to be measured. As the size of the exclusive use area and living room area increased, the grade of floor impact sound has been lowered. However, it was confirmed that the heavy-weight impact sound is most unfavorably evaluated where the width and length ratio of the living room, where measurements were undertaken, is between 1.0 and 1.1. And the floor impact sound tendency does not appear according to the floor. The research results are intended to be used as a basic data for designing the living room to secure the floor impact sound reduction performance and the introduction of the floor impact sound evaluation system before using approval inspection. - COLLAPSE
    February 2020
  • Research Article

    Comparison of Thermal Characteristics on Cool Roof of Vacuum Ceramic Coatings and Rooftop Waterproofing Coatings

    옥상방수도료와 진공세라믹 차열도료의 쿨루프에 대한 열적 특성 비교

    Park, Min-Yong

    박민용

    Cool Roof is a roof type of thermal properties with high solar reflectivity and high radiation rate, which is commonly referred to ... + READ MORE
    Cool Roof is a roof type of thermal properties with high solar reflectivity and high radiation rate, which is commonly referred to as a roof that has a lower surface temperature than conventional roofs. In the wake of the 2018 heat wave, local governments are expanding their cool roof businesses in poor and old public facilities in preparation for the summer heat wave, even installing cool roof through building energy efficiency loan support, and applying long-term waterproofing and high-heated technology at the same time, unlike the previous method of applying only white heat-blocking paint on building rooftops. In this study, while measuring 3 cool roof models for one year, the thermal characteristics of the cool roof are compared two roof models of urethane coating and polyurea coating, being currently used for building roof exposed waterproofing, with one roof model of vacuum ceramic coating which in eco-friendly thermal proof performance. - COLLAPSE
    February 2020
  • Research Article

    Analysis of Air and Droplet Infectious Bacterial Distribution by Air Filter Effectiveness in Medium-Sized Hospital

    중규모병원 진료부의 평면유형별 에어필터 효율에 따른 공기와 비말 감염균 분포 분석

    Lee, In-Ho, Hwang, Jung-Ha

    이인호, 황정하

    This study investigated the current state of mid-size hospitals mainly dealing with respiratory diseases in city D. After classifying the floor plans ... + READ MORE
    This study investigated the current state of mid-size hospitals mainly dealing with respiratory diseases in city D. After classifying the floor plans into integrated type and corridor type, and selecting the target buildings that have different floor plan types, indoor airflows were measured. Based on this, the study aimed to provide basic data for the prevention of spread of airborne and droplet infections occurring in the outpatient departments of hospitals. This was accomplished by performing simulations to analyze the distribution of airborne (0.5 ㎛) and droplet (20 ㎛) viruses after classifying HEPA filter, one medium filter and two medium filters according to the efficiency of air filters among the equipment used for prevention of nosocomial infection. the efficiency of the two medium filters is considered to be an effective air- conditioning facility to reduce the concentration of infectious bacteria in the medium-sized hospital, as shown to be similar to that of the HEPA filter. - COLLAPSE
    February 2020
  • Research Article

    Long-term Performance and Characteristic Evaluation of Vacuum Insulation Panel (VIP) According to Core Material

    심재에 따른 진공단열패널의 특성 및 장기성능 평가

    Kim, Sang-Myung, Fred Edmond Boafo, Kim, Jin-Hee , Kim, Jun-Tae

    김상명, 프레드 에드먼드 보아포, 김진희, 김준태

    Recently to reduce energy consumption in the building sector, insulation regulation of the building envelope has been strengthened more and more. The ... + READ MORE
    Recently to reduce energy consumption in the building sector, insulation regulation of the building envelope has been strengthened more and more. The strengthened regulation on insulation results in thicker building envelope and the thicker envelope makes inner space become narrow. One of the solutions to meet strengthened insulation regulation is using high efficient insulation for the building envelope. Vacuum Insulation Panel (VIP) is one of high efficient insulation which has 8~10 time lower thermal conductivity than existing insulations. By installing VIPs for building insulation, meeting the strict insulation regulation and maintaining large inner space are both possible. Generally, the lifetime of buildings is more than 50 years. However, the study on the long-term performance of VIPs is insufficient. In this paper, the performance and durability of VIPs were investigated. For the performance evaluation, VIPs from 5 companies were investigated. 4 types of VIPs based on fumed silica and 2 types of VIPs based on the glass fiber were tested. To analyze the performance of VIPs the thermal conductivity and inner pressure of VIPs were measured. For the analysis of the long-term performance for VIP, the accelerated aged test based on ISO standard was conducted. The accelerated test was done for 180 days and the test condition was kept at temperature of 50℃ and relative humidity of 70%. This paper compared the performance of VIP depending on the core material. Also, it showed the performance changed according to time and the estimated long-term performance of VIPs based on the accelerated aging test result was discussed. This paper would be a foundational research to help apply VIPs for the building industry. - COLLAPSE
    February 2020
  • Research Article

    Determination of Optimal Variables for Chilled Water Loop in Central Air-conditioning System using Genetic algorithms

    유전알고리즘을 이용한 중앙공조시스템 냉수배관계의 최적제어 방법

    Seong, Nam-Chul, Kim, Jee-Heon, Choi, Won-Chang

    성남철, 김지헌, 최원창

    This paper suggests the real-time optimal control method of central air-conditioning system using chilled water. The control variables for optimization are differential ... + READ MORE
    This paper suggests the real-time optimal control method of central air-conditioning system using chilled water. The control variables for optimization are differential pressure of the pump and the supply chilled water temperature supplied to the air conditioning system produced from the central chiller. The optimal control variables of the control point are calculated using genetic algorithm in one-hour time step. The objective function of algorithm was the energy consumption of the HVAC system, and the energy consumption was calculated using the mathematical model. The results of the operation of the normal mode under the initial design conditions and the optimal operation mode with the optimal control variables were evaluated by comparing the energy consumption of the HVAC system with the variation of the control volume at the control point selected in this study. As a result, the chilled water supply temperature of the chilled water loop was operated by changing between approximately 9°C and the differential pressure of the pump between 34.87 kPa and 78.91 kPa for the optimal control method. The total energy consumption of the HVAC system during optimal control operation was reduced by 16.98% compared to operation of the normal mode. - COLLAPSE
    February 2020
  • Research Article

    A Study on the Estimation of Quantitative Damage on Solar Encroachment using the Winter Solar Window

    겨울태양창을 이용한 정량적 일조피해의 추정에 관한 연구

    Lee, Hyun-Woo, Choung, Dae-Jin

    이현우, 정대진

    This paper presents the way of estimating quantitative damage on solar encroachment using the winter solar window of the vertical sun path ... + READ MORE
    This paper presents the way of estimating quantitative damage on solar encroachment using the winter solar window of the vertical sun path diagram. The winter solar window is divided into 108 parts that are composed of 18 divisions of time by 6 divisions of date. The direct solar heat radiation of each part that is blocked by surrounding buildings during three months from November 21 to February 21 is calculated based on the incident solar angle on a window of a residence. Then the direct solar heat radiations are multiplied by the physical characteristics of windows and the city gas price and added up to become the total increased heating expense of a residence during the underheated period of three months. - COLLAPSE
    February 2020
  • Research Article

    Measurements and Evaluations of Predictors for Speech Intelligibility Using Speech and Noise Levels Measured During Lectures

    실제 강의현장에서의 음성과 소음 레벨을 반영한 음성 명료도 지표의 측정 및 평가

    Choi, Young-Ji

    최영지

    The useful-to-detrimental sound ratios (U50) measure can be more practically useful means of assessing and understanding real classroom situations because it can ... + READ MORE
    The useful-to-detrimental sound ratios (U50) measure can be more practically useful means of assessing and understanding real classroom situations because it can be easily obtained from both measured clarity (C50) and signal-to-noise-ratio (SNR) values in classrooms during speech communication. The goal of this work is to better understand room acoustics conditions for real speech communication during actual lectures and to provide U50 values for achieving ‘good’ acoustical conditions for speech intelligibility in university classrooms. In the present work, U50 is determined from both measured C50 and SNR values during 15 actual lectures in 11 university classrooms in Korea. The linear regression results for speech transmission index (STI) and U50 values show that classrooms having U50 values greater than +4.1 dB correspond to STI values of 0.60, indicating ‘Good’ acoustical conditions for speech intelligibility. The U50 value is 0.9 dB lower than that of the previous study made in quietly occupied classrooms without student activities. The present result indicates that the noise level is not the same as experienced during actual lecturing situations in university classrooms. When the classroom has a SNR (125-4k) value of 7.7 dB or lower a C50 (125-4k) value of 7.3 dB or greater to be required for achieving good acoustical conditions during lectures in university classrooms. - COLLAPSE
    February 2020
  • Research Article

    Improvement in Energy Performance of Office Buildings according to the Evolution of Building Energy Code

    건축물의 에너지절약설계기준 강화에 따른 업무용 건물의 에너지성능 개선 효과

    Kim, Ji-Hye, Sung, Jea-Eun, Kim, Hye-Gi, Park, Duk-Joon, Kim, Sun-Sook

    김지혜, 성제은, 김혜기, 박덕준, 김선숙

    Building energy codes are widely used worldwide as a key policy tool for improving building energy efficiency by defining the minimum requirement ... + READ MORE
    Building energy codes are widely used worldwide as a key policy tool for improving building energy efficiency by defining the minimum requirement for the energy performance of new buildings. In Korea, the building energy code includes prescriptive criteria such as U-value requirements for each building component by climate zones and EPI (Energy performance index) as well as performance criteria for primary energy use. The purpose of this study is to suggest the direction to revise building energy code based on the analysis of improvement in energy performance of buildings according to its evolution over the past 20 years. The energy needs and primary energy uses were calculated for three office buildings and four cities. An increasing trend of energy performance was found with the reinforcing of the code, and some recommendations for future revision were suggested. - COLLAPSE
    February 2020
  • Review Article

    A Study on Energy Efficiency Index Analysis and Optimal Energy Management Factor Technology of Superstores in Korea

    국내 대형마트의 에너지효율지표 분석과 최적 에너지관리 요소기술 도출에 관한 연구

    Shim, Hong-Souk, Seo, Youn-Kyu, Jung, Hyun-Chae

    심홍석, 서윤규, 정현채

    This paper purposes on the development of energy management framework, focusing on the superstores in South Korea. Those superstores are usually huge ... + READ MORE
    This paper purposes on the development of energy management framework, focusing on the superstores in South Korea. Those superstores are usually huge retail outlets, operating for a long time, and thus requires a large amount of energy consumption. Nevertheless, few attempts have been made to identify the energy management issues in the superstores and to propose the way to improve their energy management systems. To meet this needs, we firstly analyzed the over trends of energy use in South Korean superstores using various energy efficiency indices. Then, on two stores chosen as our case targets, in-depth analysis was carried out in terms of their current energy use and capabilities to reduce the energy use. The research findings are expected to support energy manager’s strategic decision-makings at the firm level and further to contribute to the CO2 reduction at the national level. - COLLAPSE
    February 2020
  • Research Article

    Improvement Methods of Individual Boiler Heat Source considering Reduced Heating Load of Low-Energy Apartment Buildings

    저에너지 공동주택의 감소된 난방부하를 고려한 개별 보일러 열원의 개선 방안

    Rhee, Kyu-Nam, Jung, Gun-Joo

    이규남, 정근주

    In this study, the improvement methods of conventional heat sources were suggested and evaluated in order to reduce the heating energy of ... + READ MORE
    In this study, the improvement methods of conventional heat sources were suggested and evaluated in order to reduce the heating energy of low-energy apartment buildings. To do this, the part load ratio (PLR) was analyzed for the apartment building that was designed in accordance with the energy saving design standard in Korea. The analysis results showed that the PLR of low-energy apartment buildings was very low, which may result in the reduced part-load efficiency of conventional gas boiler and the deteriorated energy-saving performance. To overcome this problem, it was suggested that the part load efficiency under low-PLR conditions should be enhanced by applying modulation boiler or boiler with high turn-down ratio. The improved part load efficiency allowed more energy saving up to 9.6%. It was also proposed that the low-energy apartment buildings should be equipped with condensing boilers, which have relatively high part load efficiency under low-PLR conditions. It was found that the condensing boiler can reduce the heating energy consumption by 27.0%. As for the operation strategy, it was suggested to decrease supply water temperature in order to increase the boiler efficiency while preventing discomfort due to overheating in the highly-insulated apartment buildings. It was found that water temperature of 40℃ can reduce the heating energy consumption by 13.1%. - COLLAPSE
    February 2020
  • Research Article

    Result Comparison of Internal Condensation Evaluation method through EN 15026 Benchmark Test

    EN 15026 Benchmark Test를 통한 내부결로 평가방법의 해석결과 비교

    Min, Da-Hye, Kim, Young-Tag, Kwon, Young-Cheol, Yoo, Dong-Chul, Jang, Hyang-In

    민다혜, 김영탁, 권영철, 유동철, 장향인

    As condensation is recognized as a major problem and defect in buildings, There is a need for an accurate evaluation method and ... + READ MORE
    As condensation is recognized as a major problem and defect in buildings, There is a need for an accurate evaluation method and criteria for determining condensation. However, in Korea, there is no evaluation criteria other than whether surface condensation using TDR occurs in a steady state. Therefore, The study considered methods for evaluating internal condensation in abnormal conditions and compared and analyzed the EN 15026 benchmark results. Comparing the evaluation index of EN 15026 and the calculated values of the researched evaluation method, the overall distribution of the temperature and the moisture content and the shape of the graph were calculated and analyzed very similarly. Later, the researched Matsumoto Mamoru algorithm is applied to reduce condensation in the initial design, and further research on the analysis of various structures will be performed. - COLLAPSE
    February 2020
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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