• Research Article

    Analysis of Energy Use Intensities (2017 – 2018) by End Use in Sample Apartment Units Based on Measured Data

    계측 데이터를 활용한 아파트 표본 세대에서의 용도별 에너지사용량 원단위(2017 – 2018) 분석

    Jin, Hye-Sun, Ha, Soo-Yeon, Kim, You-Jeong, Lee, Soo-Jin, Kim, Sung-Im, Song, Seung-Yeong

    진혜선, 하수연, 김유정, 이수진, 김성임, 송승영

    A national research project is being conducted to provide building energy information, which is now mainly limited to energy consumption data by ... + READ MORE
    A national research project is being conducted to provide building energy information, which is now mainly limited to energy consumption data by fuel type, for each end use such as space heating, domestic hot water, etc. In order to achieve research objectives, energy consumption measurement systems by end use are being installed in sample buildings over a six-year period, which began in 2014. The measured data are being statistically processed for constructing an information system on energy use and CO2 emission intensities by end use. This study aims to present statistical values on site energy use intensities by end use calculated using measurement data of 71 sample apartment units in Seoul for 1 year from May 2017 to April 2018, and to compare these data to the U.S. Residential Energy Consumption Survey (RECS) 2015 data. The average site EUIs are in the following order: space heating > electrical appliances > DHW > cooking > lighting > space cooling > air movement. The average site EUIs have the same order as those of the RECS 2015 data: space heating > electrical appliances, etc. > DHW > space cooling. The number of sample apartment units will continue to increase until 2019 (total number of samples 200) and intensity data by end use will be continuously updated through collection of measurement data. - COLLAPSE
    August 2019
  • Research Article

    Thermal Property Test for Thermal Bridges of Window-Wall Package Envelope

    창호-벽체 패키지 외피의 열교 부위 열성능 평가

    Kim, Hye-Rim, Shin, Sang-Yong, Choi, Min-Ho, Ahn, Byung-Lip, Sung, Uk-Joo

    김혜림, 신상용, 최민호, 안병립, 성욱주

    Building components need to be developed as packages to commercialize Zero Energy Buildings (ZEB). This study aims to suggest the thermal property ... + READ MORE
    Building components need to be developed as packages to commercialize Zero Energy Buildings (ZEB). This study aims to suggest the thermal property test and determination values for thermal bridges of window-wall package envelope. First, the legislations and standards regarding thermal properties of envelopes are reviewed. Second, the methods of thermal property test are described, which utilizes the condensation evaluation methods in KS F 2829, ISO 6781 and the linear thermal transmittance evaluation methods in ISO 10211. The determination values for window-wall package envelope certification are also suggested, which are based on KS F 2829 and Energy Performance Index (EPI). Third, the thermal property of manufactured window-wall package envelope was evaluated using the suggested testing methods. The Temperature Difference Ratio inside (TDRi) of the tested envelope was below 0.15 and the linear thermal transmittance of the tested envelope was below 0.4 W/m·K. Therefore, the tested envelope is certified that it has a good thermal property, low risks of condensation, and low risk of thermal bridge. - COLLAPSE
    August 2019
  • Research Article

    A Model Calibration for Residential Building Energy Simulation : A Case Study with TRNSYS and Optimization Tool GenOpt

    TRNSYS 건물 에너지 시뮬레이션 모델 캘리브레이션: GenOpt를 이용한 사례 연구

    Lim, Heung-Bin, Lee, Kyoung-Ho, Kong, Min-Suk, Seo, Dong-Hyun

    임흥빈, 이경호, 공민석, 서동현

    This paper demonstrates a calibration methodology for adjusting model parameters and factors using assistant tools ― python and GenOpt. In this study, a ... + READ MORE
    This paper demonstrates a calibration methodology for adjusting model parameters and factors using assistant tools ― python and GenOpt. In this study, a building simulation model is developed for a demonstration building for a low-energy solar house. The model is composed of a 3D model describing building architecture and HVAC system model using TRNSYS simulation program. In this study, model calibration methodology consists of two phases in order to improve the accuracy of building energy model and reduce errors of simulation results: Parameter adjustment phase and factor optimization phase. Trial and error approach is used for the first phase and GenOpt tool is employed for the second phase to improve the model performance. Based on American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) Guideline 14 indices, the performance of the calibrated building simulation model is evaluated to obtain Normalized Mean Bias Error (NMBE)hourly, values within ±10% and Coefficient Variation of Root Mean Square Error (CV(RMSE))hourly, values within 30%. The performance indices are calculated with simulated and measured temperatures of each indoor zone and buffer tank. Daily data is used for calibrating heat pump (HP) electrical energy consumption because it is hard to fit the operating time of HP which can be different to time that heating load occurs. As a result of the calibration process, it is found that the values of NMBEhourly and CV(RMSE)hourly achieves within followings: Average indoor temperature 一 NMBEhourly is 1.2% and CV(RMSE)hourly is 2.2%. Buffer tank temperature NMBEhourly is 1.5% and CV(RMSE)hourly is 8.2%. And the value of NMBEdaily and CV(RMSE)daily are used for HP electrical use as following: NMBEdaily is 9.5%, CV(RMSE) is 23.4%. - COLLAPSE
    August 2019
  • Research Article

    Performance Comparison for Micro-Grid Operation with Meta Heuristic Methods

    초소형 마이크로그리드 최적 전력운영을 위한 메타 휴리스틱 기법 성능 비교분석

    Lee, Myung-Hee, Jeong, Jin-Hwa, Chae, Young-Tae

    이명희, 정진화, 채영태

    This paper presents optimal electricity power operation compared with different meta heuristic methods in of micro-grid. We also evaluate operation price using ... + READ MORE
    This paper presents optimal electricity power operation compared with different meta heuristic methods in of micro-grid. We also evaluate operation price using the selected optimization method based on subsidy system of DERs (distributed energy resources). The meta-heuristic methods show that the averaged electricity load are reduced 6,066 kWh per month (▼9.45%) and electricity price are saved 778,000 KRW per month (▼11.78%) compared to original operation method without DERs. Among them, the MILP (Mixed-integer Linear Programming) method shows not only outperformed optimization performance but also can reduce operation price of 2% compared with other methods. We then evaluate the operation price applying subsidy system of DERs based on MILP method. The results show that 2,207,000 KRW per month (▼30.31%) of total operation price can saved by using MILPS (Mixed-integer Linear Programming with subsidy) compared with MILP method for a month. Finally, MILPS method can reduce price savings of 3,037,000 KRW (▼37.45%) compared with the original operation method for a month. - COLLAPSE
    August 2019
  • Research Article

    Adjustment Effect of Water Flow Rate for Floor Heating System considering the Difference in Floor Covering of Individual Room

    실별 바닥 마감재 차이를 고려한 바닥난방 시스템의 온수유량 조절 효과

    Rhee, Kyu-Nam, Kim, Jong-Hyun, Kim, Kwang-Myung, Kim, Bum-Soo, Jung, Gun-Joo

    이규남, 김종현, 김광명, 김범수, 정근주

    In this study, the impact of floor coverings on the behavior of floor surface and room air temperature was investigated through mock-up ... + READ MORE
    In this study, the impact of floor coverings on the behavior of floor surface and room air temperature was investigated through mock-up experiment and energy simulation. The results showed that temperature unbalance between each room can be caused by different floor covering material. PVC flooring showed the fastest speed of temperature rise and descend, followed by VCT (Vinyl composite tile), wood and porcelain tile. It was found that the rise time is related with the heat capacity and thermal resistance, which were analyzed based on the heat balance equation. Thus, it was suggested to adjust water flow rate considering the heat capacity and thermal resistance of floor covering, in order to minimize the temperature unbalance in each room and the probable thermal discomfort. The augmented flow rate resulted in the reduced rise time in the room with massive floor covering such as porcelain tile, which was also effective in mitigating the temperature unbalance in each room. In addition, it was found that the rise time and temperature unbalance can be more reduced by resetting the augmented flow rate to design flow rate, if room air temperature approaches its set-point temperature. - COLLAPSE
    August 2019
  • Research Article

    Development of Tools for Prediction and Evaluation of Building Energy Consumption to Analyze the Effect of Energy Saving Technology

    에너지절감기술 도입 효과 분석을 위한 건물에너지소비량 예측 및 평가 도구 개발

    Yang, Soo-Hyun, Park, Won-Jang, Kim, Su-Jong

    양수현, 박원장, 김수종

    This study proposed tools to predict and evaluate building energy consumption in order to analyze the impact of the introduction of energy ... + READ MORE
    This study proposed tools to predict and evaluate building energy consumption in order to analyze the impact of the introduction of energy saving technologies. First of all, We reviewed the prediction and evaluation methodology and derived the prediction and evaluation system based on the formula analysis, regression analysis, and simulation analysis. Tools Users can apply the analysis method by considering the target building, assessment scope, assessment type, and present possession of data. Furthermore, Users can predict and evaluate building energy consumption using real metering data in conjunction with BEMS control point data or by entering data directly. Based on the tools, it is deemed possible to be applicable to energy efficient new building design, ESCO project, and green remodeling project. In addition, it is expected that non-expert will be able to easily review the energy saving effects. - COLLAPSE
    August 2019
  • Research Article

    Analysis of Natural Lighting Performance of Kwangajeong according to Window-to-Wall Ratios and Daylighting Factors

    관가정의 창면적비와 주광률 검토를 통한 자연채광 성능 분석

    Cheong, Chang-Heon, Park, Beung-Yong, Ryu, Seong-Ryong

    정창헌, 박병용, 류성룡

    This study evaluated natural lighting performance of Kwangajeong, the traditional housing in South Korea. Window-to-wall ratios were calculated by using the drawing ... + READ MORE
    This study evaluated natural lighting performance of Kwangajeong, the traditional housing in South Korea. Window-to-wall ratios were calculated by using the drawing documents. Daylighting factors were determined by field measurement. The results indicate that daylighting factor of the Kwangajeong is slightly low comparing present sustainable building design guide in South Korea even though the window-to-wall ratios are relatively high. It is thought that the relatively low daylighting factor are resulted by the low transmittance of Changhoji, the paper used on windows and Cheoma, eaves of the roof. - COLLAPSE
    August 2019
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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