• 에너지공학
• /
• 제28권1호
• /
• pp.37-44
• /
• 2019

국내 건축물은 국가 온실가스 배출의 25%, 에너지소비의 20%를 차지하고 있어 건축물의 에너지 효율향상이 국가 에너지수요관리의 주 대상으로 인식되고 있다. 건축물의 에너지효율향상을 위해 "제로에너지건축물 국가 로드맵"을 작성하여 정책들을 시행하고 있으며, 제로에너지건축물 의무화 확대의 따라 조기 활성화를 통한 국가 건물에너지 수요관리 효율성을 제고 하고 있다. 또한 건축물이 완공되고 그 후 에너지절감량에 대한 성과검증에 대한 필요성 또한 높아지고 있다. 이에 따라 건축물의 에너지 성능을 평가하기 위한 방법들이 제시되어야 할 것이다. 본 논문은 국제표준 및 가이던스 분석과 동시에 국내 학교를 현장 방문하여 각종 변수 등에 대한 조사 분석을 통하여 국제적으로 적용 가능한 제로에너지스쿨의 에너지성과검증 방법을 개발, 제시하고자 한다.

• 신재생에너지
• /
• 제19권3호
• /
• pp.1-12
• /
• 2023

This study aims to evaluate the optimal size of the hydrogen facility to be installed in a zero-energy district in terms of load matching and facility efficiency. A mismatch between energy generation and consumption is a common occurrence in zero-energy districts. This mismatch adversely effects the energy grid. However, using an energy carrier such as hydrogen can solve this problem. To determine the optimal size of hydrogen fuel cells to be used on-site, simulation of hydrogen installation is required at both district-and building- levels. Each case had four operating schedules. Therefore, we evaluated eight scenarios in terms of load matching, heat loss, and facility operational efficiency. The results indicate that district-level installation of hydrogen facilities enables more efficient energy use. Additionally, based on the proposed model, we can calculate the optimal size of the hydrogen facility.

• 한국농촌건축학회논문집
• /
• 제20권4호
• /
• pp.1-8
• /
• 2018

In this study, we survey the 2 buildings at the Central 1 and 8 buildings at the Central 2, which are divided by each climate region in the rural regions. Major heat loss factors are 47% loss of the outer shell including outer wall, roof, and bottom, 30% loss through window, and 23% loss through crevice wind. We analyze the energy simulation of ECO2 program to construct a zero energy building regarding village hall located in Jung Juk 4-le at Centeral 2. We simulate the primary energy requirement regarding village hall and the simulated results show the $265.3kWh/m^2{\cdot}a$ and it may estimate '2' energy efficiency grade. The energy requirement regarding village hall is the $183.2kWh/m^2{\cdot}a$ when the passive technology are applied in village hall. We research total amount of energy requirement in village hall when the passive and active technologies such as solar cell with 3kW and solar thermal with $20m^2$, geothermal power with 17.5kW. The simulated results show the improved energy efficiency certification grade with $1^{{+}{+}{+}}$ due to the reduced primary energy requirement with 73% when passive technology including 3kW of solar panel is applied and the energy independence rate is 54%, which is estimated to be 4th grade of zero energy buildings. The order of energy consumption are solar panel, solar thermal, and geothermal power under applied passive technology in the building. In order to expand the zero energy building, it is necessary to introduce the zero energy evaluation system in the rural region.

• 한국태양에너지학회 논문집
• /
• 제27권3호
• /
• pp.161-167
• /
• 2007

Zero Energy Multi-House(ZeMH) signifies a residential building which can be self sufficient with just new and renewable energy resources without the aid of any existing fossil fuel. For success of ZeMH, various innovative energy technologies Including passive and active systems should be well integrated with a systematic design approach. The first step for ZeMH is definitely to minimize the conventional heating and cooling loads over 50% with major energy conservation measure and passive solar features which are mainly related to building design components such as super-insulation, super window, including infiltration and ventilation issues. The purpose of this study is to analyze the thermal effect of various building design components in the early design of ZeMH. The process of the study is presented in the following. 1) selection reference model for simulation 2) verification of reference model with computer simulation program(ESP-r 9.0). 3) analysis of effect according to insulation-thickness, kinds of windows, rate of infiltration. and The simulation results indicate that almost 50% savings of conventional heating load in multi-house can be achieved with the optimum design of building components such as super insulation, super window, infiltration, ventilation.

• Journal of Power Electronics
• /
• 제19권2호
• /
• pp.560-568
• /
• 2019

This paper studies the inherent relationship between currents and zero-sequence components. Then a precise algorithm is proposed to calculate the injected zero-sequence component to control the DC-Link neutral-point voltage balance, which can result in a more efficient and flexible neutral point voltage balance with a desirable performance. In addition, it is shown that carried-based PWM with the calculated zero-sequence component scheme can be equivalent to space-vector pulse-width modulation (SVPWM). Based on the proposed method, the optimal zero-sequence component of the feasible modulation indices is analyzed. In addition, the unbalanced load limitation of the DC-Link neutral-point voltage balance control is also revealed. Simulation and experimental results are shown to verify the validity and practicality of the proposed algorithm.

• 한국대기환경학회:학술대회논문집
• /
• 한국대기환경학회 2007년도 추계학술대회 논문집
• /
• pp.494-495
• /
• 2007

See Full Text

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2009년도 제40회 하계학술대회
• /
• pp.2186_2187
• /
• 2009

본 논문은 Zero energy building(ZEB) 또는 net zero energy building의 정의와 개념에 대해서 서술 하였다, 그리고 ZEB의 장단점을 알아보고 연구 방향에 대해서 논하였다. ZEB는 주거와 상업적 빌딩에 신재생에너지를 이용하고 에너지 소비 효울을 높여 큰 에너지 절감을 통해 경제적 이익을 얻을 수 있고 저탄소 배출로 환경을 보존 할 수 있는 녹색성장의 한 방법이다. "Zero energy"라는 단어는 요즘 많이 사용 되는데 비해 정확한 정의와 개념에 대해서는 이해가 부족하다. 따라서 본 논문에서는 ZEB에 대해 정확한 정의와 세계적 흐름, ZEB의 장단점 그리고 앞으로 연구해야 할 방향에 대해 논의 하겠다.

• 에너지공학
• /
• 제23권3호
• /
• pp.36-41
• /
• 2014

The world's overall need for natural gas (NG) has been growing up fast, especially in the residential sector. The better the estimation of residential NG consumption (RNGC) distribution, the better decision-making for a residential NG policy such as pricing, demand estimation, management options and so on. Approximating the distribution of RNGC is complicated by zero observations in the sample. To deal with the zero observations by allowing a point mass at zero, a mixture model of RNGC distributions is proposed and applied. The RNGC distribution is specified as a mixture of two distributions, one with a point mass at zero and the other with full support on the positive half of the real line. The model is empirically verified for household RNGC survey data collected in Korea. The mixture model can easily capture the common bimodality feature of the RNGC distribution. In addition, when covariates were added to the model, it was found that the probability that a household has non-expenditure significantly varies with some variables. Finally, the goodness-of-fit test suggests that the data are well represented by the mixture model.

• 한국태양에너지학회 논문집
• /
• 제35권2호
• /
• pp.85-91
• /
• 2015

In this study, energy performance analysis of houses in zero energy demonstration town(ZeT) was carried out using the monitoring results. This ZeT was composed 29 zero energy individual houses(ZeH) which were applied passive as well as active technologies. The results are as follows. (1) Residents are generally considered to have been lacking basic mind to save energy, (2) In particular, average yearly total energy consumption per house is 12,834 kWh and specific heating energy is $53.2kWh/m^2{\cdot}yr$ which is higher than that of passive house. This is because of one of the reason just pointed out in subsection (1). (3) Most part of the residual energy load are supplied with only renewable energy, but not operating energy for geothermal heat pump which is use of cheap electricity.

• 전기전자학회논문지
• /
• 제20권4호
• /
• pp.373-377
• /
• 2016

열전 변환 에너지 하베스팅을 위한 저 전력 부스트 컨버터에 사용하는 새로운 Zero Current Sensor (ZCS)를 이 논문에서 제안한다.새로 제안하는 ZCS를 사용하는 Zero Current Switching은 기존 방식인 아날로그 비교기를 사용한 Zero Current Switching방식 보다 파워 측면에서 큰 장점을 보이고 기존의 다른 방식인 딜레이 라인을 이용하는 Zero Current Switching 방식보다 면적에서 큰 장점을 보인다. 새로운 ZCS는 기존의 아날로그 비교기에 고의적으로 offset을 발생시키고 offset의 양을 digital code로 calibration 하여 출력이 나오는 시간을 조절한다. 새로운 ZCS를 이용한 Zero Current Switching은 기존의 아날로그 비교기를 이용한 Zero Current Switching 보다 대략 10배정도 적은 파워를 사용하면서 같은 성능을 보인다.