• KIEAE Journal
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• 제14권6호
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• pp.81-86
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• 2014

In recent years, many researchers have considered the building energy consumption reduction accordingly to deal with abnormal climate changes and greenhouse gas reduction. However, the lighting energy use ratio has increased in spite of the development of the high efficiency lighting device. Therefore, the study aims to produce the LED lighting applications for the effective lighting heat removal by using the heat characteristics of LED lighting and analyzing the heat removal effect. In order to increase radiant heat efficiency, the heat pipe and heat sink was attached on PCB as LED lighting applications. Experiment was conducted to verify the temperature and air velocity of inside duct: thermocouples, anemometer. The heat removal effect of LED lighting applications was measured by observing the temperature of the lighting applications and the change of air velocity in duct. The experiment shows that the temperature change in the duct according to air velocity was $0.9{\sim}5.8^{\circ}C$. It is also concluded that heat removal was calculated from 33 to 81W.

• Journal of the Korean Wood Science and Technology
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• 제39권3호
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• pp.269-280
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• 2011

오늘날 지구온난화는 전 세계적으로 가장 주요한 문제 중 하나로 부각되고 있다. 이러한 지구온난화는 급속한 에너지 사용량의 증가에 의한 이산화탄소 발생의 증가가 가장 큰 원인이 된다. 그러므로 이에 대비하기 위해서 는 모든 영역에서 에너지 절약에 대한 노력이 필요하다. 세계의 총에너지 사용량 중 건설 활동과 건물운영에서 사용되는 에너지량이 차지하는 비율이 절반이 넘는 것으로 조사되었다. 따라서 건물에너지 발생량을 줄이는 것은 전체 에너지량을 절감시키는 중요한 역할을 한다. 이에 건물에너지 소비에 대한 관심의 증대와 함께 건물의 에너지 소비와 $CO_2$ 발생량을 줄이기 위해 친환경 건축물 등급 및 인증이 요구되고 있다. 건물에너지를 줄일 수 있는 여러 가지 요인 중에서 재료의 열전도율은 패시브적인 방법으로 건물에너지를 직접적으로 줄일 수 있는 가장 기본적인 요소라 할 수 있다. 특히 전통적으로 바닥 복사난방시스템을 사용하는 우리나라의 주거건물에서 바닥마감재의 열전도율은 난방에너지 효율을 결정하는 중요한 요인이다. 본 논문에서는 주거건물의 난방에너지 절감을 위해 건축 재료의 열전도율 측정방법을 조사하고 난방 효율 평가를 위한 축소모형을 제안하였다.

• Journal of Electrochemical Science and Technology
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• 제12권3호
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• pp.302-307
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• 2021

Polymer electrolyte membrane (PEM) electrolyzer or alkaline electrolyzer is required to produce green hydrogen using renewable energy such as wind and/or solar power. PEM and alkaline electrolyzer differ in many ways, instantly basic materials, system configuration, and operation characteristics are different. Building an optimal water hydrolysis system by closely grasping the characteristics of each type of electrolyzer is of great help in building a safe hydrogen ecosystem as well as the efficiency of green hydrogen production. In this study, the basic operation characteristics of a kW class alkaline water electrolyzer we developed, and water electrolysis efficiency are described. Finally, a brief overview of the characteristics of PEM and alkaline electrolyzer for large-capacity green hydrogen production system will be outlined.

• 한국태양에너지학회 논문집
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• 제29권1호
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• pp.18-23
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• 2009

We intend to describe a 12kW building-integrated photovoltaic system which was applied into the south wall of a new building. This study showed the results that were appeared from describing the PV module manufacture and installation process, and performing generation performance analysis of BIPV system. From the result we confirmed that the generation performance of the BIPV system was changed by season. The performance ratio(PR) was about 83.6% in winter and it means that performance of this BIPV system was so good in that season. On the other hand, the PR in summer was about 75.0% dropped about 8%. It was believed that the change was influenced by the reduction of solar radiation irradiated into the PV modules by installation position and rainy spell in summer. And we also confirmed that low irradiation condition is cause of the additional loss in the total PV system. In this case, the efficiency ratio of PCS drops significantly at low input loads and the average conversion efficiency of PCS in summer was 76.4% decreased about 10% from 86% in winter.

• 중소기업융합학회논문지
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• 제2권1호
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• pp.69-75
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• 2012

지구온난화 및 기후 변화에 따른 재난, 이상기온, 질병 등 각종 사회 문제들이 대두됨에 따라, 에너지 절감 및 효율화를 위한 기술 개발이 증대되고 있다. 주택, 상업건물, 공공 건물 분야에서 소비되는 에너지는 우리나라 전체 에너지 사용의 22%를 차지함에 따라, 건물에너지 절감은 전체 에너지 절감에서 매우 중요한 요소이며, 이를 위한 방안이 추진되고 있다. 기존의 건물에서는 에너지 효율화를 위해 열 손실에 대한 대책 마련 및 에너지 저소비형 장비 사용 등의 수동적 방법을 사용하였으나, 최근에는 ICT 기술과 융합하여 에너지 사용의 측정, 모니터링, 통제를 통해 지속적으로 에너지 낭비 요소를 감지 및 제거하는 방식의 건물 에너지 효율화를 위한 능동적 기술이 대두되고 있다. 에너지 효율화를 이용하여 에너지 절감 장비를 사용하더라도, 낭비 상황을 제어하지 않으면 실질적이고 지속적인 에너지 절감 효과를 달성하기 어렵게 된다. 이 논문에서는 국내외 건물 에너지 효율화를 위한 기술 개발 현황을 소개하고, 능동적 에너지 절감을 위한 이슈를 고찰한다.

• 한국농촌건축학회논문집
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• 제20권1호
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• pp.69-76
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• 2018

This study is to research technical measures for improving energy efficiency in the conservation and reuse of historic buildings focused on the recent research trends and case studies of the west. These measures are broadly classified into three types, the passive measures for saving energy and increasing comfort, the most cost-effective energy saving strategies, and the renewable energy sources. Firstly, the passive measures are divided into the elements and systems. The passive elements are awnings and overhanging eaves, porches, shutters, storm windows and doors, and shade trees. There are also the natural ventilation systems such as the historic transoms, roofs and attics to improve airflow and cross ventilation to either distribute, or exhaust heat. Secondly, the most cost-effective energy efficiency strategies are the interior insulation, airtightness and moisture protection, and the thermal quality improvement of windows. The energy efficiency solutions of modern buildings are the capillary-active interior insulation, the airtightness and moisture protection of interior walls and openings, and the integration of the original historic window into the triple glazing. Beyond the three actions, the additional strategies are the heat recovery ventilation, and the illumination system. Thirdly, there are photovoltaic(PV) and solar thermal energy, wind energy, hydropower, biomass, and geothermal energy in the renewable energy sources. These energy systems work effectively but it is vital to consider its visual effect on the external appearance of the building.

• KIEAE Journal
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• 제15권1호
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• pp.45-51
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• 2015

The Purpose of this study is to analyze the green design strategies in residential building, based on case study of Solar Decathlon in USA. This study could provide the basic reference data and theocratical foundation for finding new green design strategies and applicability of green design for korea. The Solar Decathlon is an green design competition that challenges collegiate teams to design, build, and operate the green residential building with optimal energy production and maximum efficiency. As a result of the analysis of this study, the green design strategy is identified and analyzed design issues related in energy, materials, and indoor/outdoor environment. Also, it is useful to find best green design strategy with more economical and environmental benefits presented by renewable energy and design solutions. This study is based on selected 18 green housings of Solar Decathlon from 2002 to 2013. This result is helpful to understand the green design strategies for green residential building's design of modern residential building, and expect future green residential building design approach.

• 대한건축학회논문집:계획계
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• 제35권1호
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• pp.37-46
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• 2019

The energy of the building is influenced by the user 's activity due to the population, society, and economic characteristics of the building user. In order to obtain accurate energy information, the difference in the amount of energy consumption by the activities and characteristics of building users should be identified. The purpose of the study is to identify the difference in the amount of energy consumption by the user's activities in the same building, and to analyse the relationship between user's activities and demographic, social and economic characteristics. For research, energy simulation is performed based on actual user activity schedule. The results of the simulation were clustered by using K-Means clustering, a machine learning technique. As a result, four types of users were derived based on the amount of energy consumption. The more energy used in a cluster, the lower the user's income level and older. The longer a user's indoor activity times, the higher the energy use, and these activities relate to the user's characteristics. There is more than twice the difference between the group that uses the least energy consumption and the group that uses the most energy consumption.

• 설비공학논문집
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• 제21권2호
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• pp.71-78
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• 2009

Up until recently, the energy and the economic analysis of a cogeneration system have been implemented by a manual calculation that is based on monthly thermal loads of buildings. In this study, a cogeneration system modeling validation with a detail building energy simulation, eQUEST, for a building energy and cost prediction has been implemented. By analyzing the hourly building electricity and thermal loads, it enables users to decide proper cogeneration system capacity and to estimate more accurate building energy consumption. eQUEST also verified the energy analysis when the heat pump system is integrated with the cogeneration system. The mechanical system configuration benefits from the high efficiency heat pump system while avoiding the building electricity demand increase. Economic analysis such as LCC (Life Cycle Cost) method is carried out to verify economical benefits of the system by applying actual utility rates of KEPCO(Korea Electricity Power COmpany) and KOGAS(KOrea GAS company).

• 한국태양에너지학회 논문집
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• 제25권4호
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• pp.53-60
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• 2005

The purpose of this study is to improve energy efficiency of windows in office buildings through the evaluation of their heating, cooling and illumination load. Energy efficiency is influenced by window size which is determined at the early stage of building design. The process of this study is as follows. First, energy performance is analysed according to the various rates of windows through computer simulation (ECOTECT). Then, the annual heating, cooling and illuminating loads according to the different window sizes are compared one another. Results indicated that the optimal window size considering energy efficiency is 50% of the surface area. When the window size is 50% of the surface area, annual maintenance expense is also smallest. Since the cost of cooling is larger than that of heating, too low indoor air temperature in summer is unfavorable based on the reasonable annual maintenance expenses.