• Research Article

    A Study on the Lighting Energy Performance Analysis of a Shading Device based on Visual Comfort

    시각적 쾌적성을 고려한 차양장치의 조명에너지 성능 분석 방법에 관한 연구

    Oh Min-Seok, Lee Ju-Yoon, Kim Gi-Cheol

    오민석, 이주윤, 김기철

    The shading device on the window of the building can be an passive solution to reduce the cooling load and lighting energy, ... + READ MORE
    The shading device on the window of the building can be an passive solution to reduce the cooling load and lighting energy, as well as improving the indoor comfort. It is also an architectural element that must be considered for building energy-efficient buildings such as eco-buildings and zero-energy buildings. However, due to various building environments and various shading devices, the installation of excessive shade may lead to the risk of losing the effectiveness of windows. In this study, we propose a method for optimal automatic control of shading device and evaluate its effectiveness by energy analysis of several shading devices. - COLLAPSE
    December 2018
  • Research Article

    The Development of the Calibration Method of Building Energy Consumption by HDDm and CDDm

    냉 · 난방도일에 따른 건물에너지 사용량 보정기법 개발

    Kim Dongil, Lee Byeongho

    김동일, 이병호

    It is difficult to check the exact building energy consumption reduction such as when green remodeling of buildings, because it is due ... + READ MORE
    It is difficult to check the exact building energy consumption reduction such as when green remodeling of buildings, because it is due to outdoor air temperature over the years. And in Korea although Big Data of building energy consumption is collected and managed through『The Information System of the Building Energy and Greenhouse Gases』 it is underutilized because of non calibration of outdoor air temperature change. Therefore, this study aims to develope calibration method of building energy consumption by outdoor air temperature according to micro climates, and building use types. As a result of analysis, Regression equations of Building energy consumption and HDDm/CDDm are derived and calibration method is developed by Regression coefficient. - COLLAPSE
    December 2018
  • Research Article

    Derivation of Typical Meteorological Year of Daejeon from Satellite-Based Solar Irradiance

    위성영상 기반 일사량을 활용한 대전지역 표준기상년 데이터 생산

    Kim Chang Ki, Kim Shin-Young, Kim Hyun-Goo, Kang Yong-Heack, Yun Chang-Yeol

    김창기, 김신영, 김현구, 강용혁, 윤창열

    Typical Meteorological Year Dataset is necessary for the renewable energy feasibility study. Since National Renewable Energy Laboratory has been built Typical Meteorological ... + READ MORE
    Typical Meteorological Year Dataset is necessary for the renewable energy feasibility study. Since National Renewable Energy Laboratory has been built Typical Meteorological Year Dataset in 1978, gridded datasets taken from numerical weather prediction or satellite imagery are employed to produce Typical Meteorological Year Dataset. In general, Typical Meteorological Year Dataset is generated by using long-term in-situ observations. However, solar insolation is not usually measured at synoptic observing stations and therefore it is limited to build the Typical Meteorological Year Dataset with only in-situ observation. This study attempts to build the Typical Meteorological Year Dataset with satellite derived solar insolation as an alternative and then we evaluate the Typical Meteorological Year Dataset made by using satellite derived solar irradiance at Daejeon ground station. The solar irradiance is underestimated when satellite imagery is employed. - COLLAPSE
    December 2018
  • Research Article

    Evaluation of Residential Performance in Commercialization of Flexible Unit Infra Free Residential for Disaster

    재난 시 대응을 위한 Flexible-Unit형 인프라 프리(임시)주거의 성능평가

    Park Beungyong, Cho Jinkyun, Jeong Yongdae, Lee Wonhak

    박병용, 조진균, 정용대, 이원학

    In this paper a new kind of unit-prefabricated building is shown. The unit-prefabricated buildings are made up living unit, energy unit, water ... + READ MORE
    In this paper a new kind of unit-prefabricated building is shown. The unit-prefabricated buildings are made up living unit, energy unit, water unit. The design trend implemented the energy insulation, solar PV panels, energy storage system which are maintained for zero energy buildings. We made a prototype for zero energy flexible residential unit. The first step, we was evaluated the physical performance, insulation, airtightness. The second step, we was evaluated energy performance building to design heating and cooling system to combined PV system. As a results, the insulation performance wall was 0.18 W/(m2·K). The results of air-tightness was 12.13 ACH@50 (1/h). The building energy demand ratings and solar energy generation has the possible to be ballanced. - COLLAPSE
    December 2018
  • Research Article

    A Preliminary Research of the Bifacial PV System Under Installation Conditions

    설치환경 및 조건에 따른 양면수광형 태양광발전시스템의 기초 특성 연구

    Jang Ju-Hee, Kwon Oh-Hyun, Lee Sang-Hyuk, Shin Min-Su, Lee Kyung-Soo

    장주희, 권오현, 이상혁, 신민수, 이경수

    Nowadays the bifacial PV system market and its applications are increasing rapidly. The performance of the bifacial PV system take advantage of ... + READ MORE
    Nowadays the bifacial PV system market and its applications are increasing rapidly. The performance of the bifacial PV system take advantage of its rear surface irradiance. Also, the ground albedo, PV module tilt and azimuth, PV module installation height, shading effect and module temperature are factors of bifacial PV system performance. This paper investigates how the performance of bifacial PV system is influenced by above factors. First, we analyzed the energy yield depending on PV module installation by simulation. Secondly, we compare energy performance evaluation of monofacial and bifacial module on different weather condition by experiment. Thirdly, we tested the albedo effect and checked operating characteristics using Dupont Tyvek material for the bifacial PV module. Fourthly, we check the shading effect of bifacial PV module on bypass diode operating. Finally, we applied the bifacial PV module in the nearby subway station for the noise reduction barrier using a qualified simulation program. In summary, we confirm that the energy performance superiority of the bifacial PV module has a lot of application use including road. Also, we have confirmed the bifacial module and inverter design should be considered by rear surface irradiance. - COLLAPSE
    December 2018
  • Research Article

    Virtual In-situ Sensor Calibration and the Application in Unitary Air Conditioners

    유닛형 공기조화기 센서의 가상보정 방법 및 적용 특성 분석

    Sungmin Yoon, Yong-Shik Kim

    윤성민, 김용식

    Since data-driven building technologies have been widely applied to building energy systems, the accuracy of building sensors has more impacts on the ... + READ MORE
    Since data-driven building technologies have been widely applied to building energy systems, the accuracy of building sensors has more impacts on the building performance and system performance analysis. Various building sensors, however, can have typical errors including a random error (noise) and a systematic error (bias). The systematic error is indicated by the difference between the mean of measurements and their true value. It may occur due to the sensor’s physical condition, measured phenomena, working environments inside the systems. Unfortunately, a conventional calibration method has limitations in calibrating the systematic errors because of the difference between working environments and calibration conditions. In such situations, a novel sensor calibration method is needed to handle various sensor errors, especially for systematic errors, in building energy systems having various thermodynamic environments. This study proposes a building sensor calibration method named Virtual In-situ Calibration (VIC) and shows how it is applied into a real building system and how it solves the sensor errors. - COLLAPSE
    December 2018