• Research Article

    Measuring Convective Heat Transfer Coefficients for Individual Human Body Segments in the HVAC System of a Vehicle

    차량 공조 시 신체 부위별 대류 열전달계수 측정

    Park, Jun-Seok, Yoo, Ji-Hyun, Choi, Seung-Woo

    박준석, 유지현, 최승우

    As well as in buildings, HVAC is an important system that significantly influences energy performance and thermal comfort in vehicles. The thermal … + READ MORE
    As well as in buildings, HVAC is an important system that significantly influences energy performance and thermal comfort in vehicles. The thermal comfort indices developed for homogeneous indoors could not be applied to the inhomogeneous thermal environment of vehicles. Several human thermal physiological models have been developed to simulate transient and local inhomogeneities in the thermal environment. In this study, specific convective heat transfer coefficients of human body segments were measured through experiments in a chamber to develop a human thermal physiological model that can be used for vehicles. It is confirmed from the experiments that the convective heat transfers are significantly varied with human body segments under HVAC fan operation because of air velocity. The convective heat transfer on the subject segments ranged from 41.0 to 145.6 W/m2 and from 51.7 to 118.7 W/m2 for the second and seventh fan speeds, respectively. The model for convective heat transfer coefficients of each segment was proposed to predict the convective heat transfer in the human body. The model and results of this study could help evaluate the inhomogeneous thermal environment, and also design HVAC systems for vehicles. - COLLAPSE
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    30 October 2023

  • Research Article

    A Comparative Analysis of the Amount of Sunlight by the Placement Angle of Apartment Housing and Educational Facilities

    공동주택과 교육시설의 배치각도에 따른 일조량 비교 분석

    Yang, Hyun-Gyung, Choi, Chang-Ho, Lee, Gong-Hee

    양현경, 최창호, 이공희

    Various deliberation procedures such as basic plan establishment, safety diagnosis, maintenance plan establishment, project implementation plan establishment, educational environmental impact assessment, disaster … + READ MORE
    Various deliberation procedures such as basic plan establishment, safety diagnosis, maintenance plan establishment, project implementation plan establishment, educational environmental impact assessment, disaster impact review, and eco-friendly certification have been strengthened in recent years. In particular, the Education Environment Protection Act aims to protect the educational environment in order to prevent damage to the school’s educational environment when there is a school within a radius of 200 m. The right to sunlight is a legally protected right to enjoy sunlight, and various effects occur depending on the size, location, direction, separation distance, and shape of the planned building. This study aims to analyze the efficiency of sunlight by location. - COLLAPSE
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    30 October 2023

  • Research Article

    A Study on Improvement of Barrier Free Certification Evaluation Items Regarding Visual Alarm in the Toilet

    화장실 시각경보기 관련 장애물 없는 생활환경 인증 평가항목 개선방안에 대한 연구

    Yoo, Da-Jeong, Choi, Chang-Ho

    유다정, 최창호

    In the “4.2.1 Alarm and Evacuation Facility for the Visually and Hearing Impaired” category of Barrier Free certification jointly operated by the … + READ MORE
    In the “4.2.1 Alarm and Evacuation Facility for the Visually and Hearing Impaired” category of Barrier Free certification jointly operated by the Ministry of Health and Welfare and the Ministry of Land, Infrastructure and Transport, visual alarms installed in toilets must be installed in a well-visible location. However, there is no clear evaluation criteria for the location of the visual alarm in the bathroom, so it relies on the subjective judgment of the evaluator. Therefore, in this study, we would like to present a clear evaluation method for the location of the toilet visual alarm required by the obstacle-free living environment certification. - COLLAPSE
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    30 October 2023

  • Research Article

    Comparative Analysis for Determining Thermal Transmittance of Aluminum Stick Curtain Wall

    알루미늄스틱 커튼월의 열관류율 측정 방법 비교 분석

    Kim, Da-Hye, Kim, Ha-Yeong, Choi, So-Ra, Park, Myung-Kyu, Kim, Sung-Wan

    김다혜, 김하영, 최소라, 박명규, 김성완

    This study evaluated the error rate of thermal transmittance between actual testing and computer- based heat transfer simulation according to ISO 15099 … + READ MORE
    This study evaluated the error rate of thermal transmittance between actual testing and computer- based heat transfer simulation according to ISO 15099 for curtain wall systems. The results showed that the error rate was below 10%, which indicates a high level of accuracy in the simulation results. This demonstrates that computer-based heat transfer simulations according to ISO 15099 can be effectively used to predict thermal transmittance in curtain wall systems. The findings of this study have important implications for the building industry, as they demonstrate the usefulness of ISO 15099-compliant computer simulations in ensuring energy-efficient building design and reducing energy consumption. The results of this study contribute to the ongoing efforts to improve the sustainability of building design and construction practices. - COLLAPSE
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    30 October 2023

  • Research Article

    An Experimental Study on the Evaluation of Watertight Performance of Wet-Based External Thermal Insulation Composite System (ETICS) for Building

    건축물에 적용하는 습식 기반 외단열 미장 마감재의 수밀성 평가에 관한 실험적 연구

    Hong, Seung-Hun, Rim, Min-Yeop, Lee, Young-Jun, Kim, Tae-Ho, Jeong, Jae-Weon

    홍승훈, 임민엽, 이영준, 김태호, 정재원

    Government is working to reduce NDC (National Decisions Contribution) and greenhouse gas emissions. As a result, the construction industry is raising its … + READ MORE
    Government is working to reduce NDC (National Decisions Contribution) and greenhouse gas emissions. As a result, the construction industry is raising its annual carbon reduction target with the aim of contributing to Korea international greenhouse gas emissions. In this study, the wet-based Korea “ETICS” was evaluated in consideration of temperature and impact resistance according to the climate environment. The performance of the wet-based external insulation synthesis system was verified through experiment, and it is expected that the energy saving technology of Korean building will be further improved if the fire safety and insulation standard used in Korean building are met. - COLLAPSE
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    30 October 2023

  • Research Article

    A Study on Establishment of Standard Clothing Insulation for Optimal Control of Air Conditioner in Multi-use Shopping Space

    다중이용쇼핑공간의 공조 최적제어를 위한 외기온별 표준 착의량 설정에 관한 연구

    Won, An-Na, Hong, Won-Hwa, Lee, Tae-Dong, Yang, Soo-Hyun

    원안나, 홍원화, 이태동, 양수현

    As the trend of seeking comfort in shopping and leisure activities gains popularity, the clothing insulation worn by visitors in multi-use shopping … + READ MORE
    As the trend of seeking comfort in shopping and leisure activities gains popularity, the clothing insulation worn by visitors in multi-use shopping spaces differs from that in buildings intended for other purposes. To conserve energy in multi-use shopping spaces, known for their high energy consumption, while ensuring a comfortable indoor thermal environment, it is crucial to consider the Predicted Mean Vote (PMV) of visitors. Consequently, a regression equation was developed using actual measurements taken from June 2022 to March 2023, enabling the easy prediction of required clothing levels based on the outside temperature. The research results are summarized as follows: (1) When the outside temperature was 10°C, 20°C, and 30°C, the average clothing insulation (clo) for both men and women was calculated to be 1.00, 0.77, and 0.55, respectively. The difference between men and women did not show a significant variance within a margin of ±0.07. (2) The regression equation between the corrected outdoor temperature and clo is as follows: [y = -0.02251x – 1.2228]. (3) The recommended comfort temperature range for multi-use shopping spaces was approximately 16°C or higher for heating and 25°C or lower for cooling. - COLLAPSE
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    30 October 2023

  • Research Article

    A Study on the Isolation Performance of Modular Negative Pressure Room by Air Flow Analysis

    모듈 타입별 음압병실의 기류해석을 통한 격리성능 검토 연구

    Park, Hyung-Eun, Song, Young-Hak

    박형은, 송영학

    In this study, a preliminary review was conducted on the module type and problem-causing factors of the infill-type modular negative pressure field. … + READ MORE
    In this study, a preliminary review was conducted on the module type and problem-causing factors of the infill-type modular negative pressure field. Through CFD analysis, isolation performance for various ward types was quantitatively reviewed and the impact of contaminated air on adjacent room was identified. Due to the highly variable nature of the infill method, single-person room and double-person room were divided into unit modules to examine indoor airflow and inter-space pressure differential, and then a combination module was constructed by adjacent unit modules, and the degree of contaminated air leakage was analyzed depending on whether the interlock was open or not. The simulation results, during normal operation of each unit module, the pressure distribution appears in the following order : clean corridor> anteroom > contaminated corridor> isolation room> toilet. On the other hand, during abnormal operation due to interlock opening, it was confirmed that the isolation room (IR) and space outside the IR momentarily took the form of equal pressure and air leaked. - COLLAPSE
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    30 October 2023

  • Research Article

    An Algorithm Development of Free Cooling Operation Period Extension for Improving Cooling Performance in Water-side Economizer System

    Water-side economizer 시스템의 냉방 성능 향상을 위한 Free cooling 운전 기간 확대 알고리즘 개발

    Kim, Kwang-Hee, Kim, Yu-Jin, Song, Young-Hak

    김광희, 김유진, 송영학

    As demand for data centers is increasing, the importance of reducing cooling energy is emphasized. In this paper, a free cooling operation … + READ MORE
    As demand for data centers is increasing, the importance of reducing cooling energy is emphasized. In this paper, a free cooling operation period extension algorithm has been developed based on the flow rate control in the WSE (Water-side economizer) system to improve the cooling performance of data centers. In order to increase the supply and return temperature of chilled water and reduce the cooling tower approach temperature that determines the free cooling period, CRAH (Computer room air handler) airflow, chilled water flow rate, cooling tower flow control sequence was presented. As a result, the energy consumption of the chiller decreased by 28% per year, and the free cooling operation increased by 1,324 hours. Since the developed algorithm control the operating variables of loops that make up a general cooling system and heat exchange between multiple loops, it is expected to have high scalability that can be applied to buildings and cooling systems with different conditions. - COLLAPSE
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    30 October 2023

  • Research Article

    Analysis of Building Energy Demand by Unheated Space Temperature Calculation Method

    비냉난방공간 온도 산정 방식별 건물 에너지요구량 분석

    Lim, Su-Hyun, Park, Sung-Jung

    임수현, 박성중

    Since ECO2 program, a national certification program, is for certification, some algorithms were omitted so that the results do not differ significantly … + READ MORE
    Since ECO2 program, a national certification program, is for certification, some algorithms were omitted so that the results do not differ significantly depending on the evaluator. Currently, the same program is used in remodeling, but a reliable program that differs little from actual energy use is needed during remodeling. Among the algorithms omitted from the program, the algorithm for the influence of unheated spaces was also omitted. As a result, heat transfer between adjacent zones was omitted, which may result in a difference from the actual building energy use. Therefore, this study analyzed the impact of unheated space temperature on building energy demand. The difference between reflecting and not reflecting the unheated space was compared, and various application methods for the temperature of the unheated space were reviewed. As a result of the analysis, it appears that there is a large difference in energy demand when applying and not applying the temperature of unheated spaces through a detailed calculation method, and when applying it through a simple calculation method. Accordingly, it is necessary to consider applying the temperature of unheated spaces through a detailed calculation method. - COLLAPSE
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    30 October 2023
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