Energy performance evaluation of a plus energy house based on operational data for two years: A case study of an all-electric plus energy house in Korea

Lee, Hyomun; Choi, Minjoo; Lee, Ruda; Kim, Dongsu; Yoon, Jong-Ho

doi:10.1016/j.enbuild.2021.111394

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…This building is an all-electric zero-energy detached house with a floor area of approximately 98 m 2 . Detailed technical information on this building and the applied passive and active elements can be found in Lee et al [36]. The experiments were performed in winter to analyze the heat flux patterns of the heated windows.…”

Section: Description Of the Heated Window System Applied To A Zero-energy Housementioning

confidence: 99%

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

et al. 2022

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Energy loss through windows can be high relatively compared to other opaque surfaces because insulation performance of fenestration parts is lower in the building envelope. Electrically heated window systems are used to improve the indoor environment, prevent condensation, and increase building energy efficiency. The purpose of this study is to analyze the thermal behaviors of a heated window under a field experiment condition. Experiments were conducted during the winter season (i.e., January and February) with the energy-efficient house that residents occupy. To collect measured data from the experimental house, temperature and heat flux meter sensors were used for the analysis of heat flow patterns. Such measured data were used to calculate heat gain ratios and compare temperature and dew point distribution profiles of heated windows with input power values under the changed condition in the operating temperature of the heated glazing. Results from this study indicated that the input average heat gain ratio was analyzed to be 75.2% in the south-facing and 83.8% in the north-facing at nighttime. Additionally, compared to January, reducing the operating temperature of the heated glazing by 3 °C decreased the input energy in February by 44% and 41% for the south-facing and north-facing windows, respectively. Through such field measurement study, various interesting results that could not be found in controlled laboratory chamber conditions were captured, indicating that the necessity of establishing various control strategies should be considered for the development and commercialization of heated windows.

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Section: Description Of the Heated Window System Applied To A Zero-energy Housementioning

confidence: 99%

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

et al. 2022

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“…A balanced and renewable energy transformation can be achieved by developing local and national strategies [27]. In order to better adapt the building to climatic conditions and to follow up the average of seasonal changes in consumption, a 1-year equilibrium period should be taken as a basis [28].…”

Section: Introductionmentioning

confidence: 99%

Net Positive Energy Buildings in Architectural Context

Takva

Caliskan

Çakıcı

2022

5003

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Considering the rapid depletion of natural resources because of increasing comfort conditions in living spaces and increasing expectations from buildings due to developing technology and climate change, today it has become inevitable to develop effective policies to meet the energy demand of buildings and to create renewable and sustainable systems. In this context, new generation building design in architecture requires regulations that reduce energy consumption, protect natural resources while considering climatic conditions and carbon emissions. In this study, buildings with net-positive energy were evaluated with the comparative analysis method and inferences were made for new generation building designs. In the first step, the properties of buildings with net-positive energy are discussed. Then, it is aimed to evaluate the buildings in which the design principles determined for a positive energy building are applied according to these features. In this context, ten buildings, which can produce more energy than the energy they consume and whose designs were made by considering the energy criteria developed according to different climatic regions, were examined. It is aimed the outcomes of this study to raise awareness against building design concepts with net-positive energy and contribute to raise the number of buildings designed with energy concepts.

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“…. 그뿐만 아니라 박공지붕의 단독주택 또는 공동주택의 지붕형 PV 시 스템 또한 남향을 향하는 지붕에만 PV 모듈을 설치하여 시스템을 구성하는 것으로 나타났다 [10][11][12] .…”

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The Assessments of Operational Performance for North-facing PV System based on Measured Data

Lee

Bae²,

Choi

et al. 2022

J Korean Solar Energy

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Photovoltaic (PV) systems are commonly used as on-site electric power generators for ZEBs in the Republic of Korea. To enhance the performance of PV systems, considering efficient installation conditions, such as the optimal azimuth and tilt angles, is critical. Under domestic PV application guidelines, the azimuth of installation for building-applied PV systems is stipulated within a maximum of ±90° based on the south-facing direction. In general, the northfacing direction is known as a weak position for PV systems. However, several studies have shown that the north-facing direction can be a good option for building PV installations, typically when the installation areas are limited within a building site. Even if the PV panel faces north, the system can operate effectively with proper performance when installed at a suitable inclination angle. In existing studies, system behavior has been verified based on simulationbased analysis, but actual operational data analysis remains insufficient. This study aims to evaluate the feasibility of north-facing PV systems based on a performance evaluation of the measured data of a roof PV system. The roof PV system analyzed in this study was composed of modules, module-level power electronics (MLPE), and one inverter. The PV modules and MLPEs were installed on both the southern (SIR) and northern (NIR) inclined roofs. Based on the annual cumulative DC power, the energy yields of the MLPE connected to modules of the SIR and NIR are 1,445.0 and 1,068.7 kWh/kWp, respectively. Our study found that the ratio of the performance of MLPE on the NIR to MLPE on the SIR was 74.0%. This ratio was similar to the energy yield of the PV system on the south vertical plane as compared to that on the south slope plane. The analyzed results revealed that an acceptable performance of the PV system installed on a northern slope at a suitable inclination angle could be expected as compared with other PV installations such as the southern vertical.

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Energy performance evaluation of a plus energy house based on operational data for two years: A case study of an all-electric plus energy house in Korea

Cited by 11 publications

References 8 publications

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

Net Positive Energy Buildings in Architectural Context

The Assessments of Operational Performance for North-facing PV System based on Measured Data

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