• KIEAE Journal
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• 제16권2호
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• pp.11-16
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• 2016

Purpose: International efforts to save Earth's environment against global warming and environmental pollution have been made in many countries. Energy consumption of buildings has been continuously increasing, and it has been over 40% of total energy consumption in the world. Energy consumption of buildings in Korea reaches 24% of total energy consumption. So, Korea government has executed building energy rating systems to control energy consumption of buildings. Method: This study was carried out to evaluate the energy performance of apartment unit plans according to converting balconies into living areas. For the study, six types of input models were made. Two input models(SP1 and SP 2) were the standard units that balcony areas were not converted into living areas, and four ones(EP 1, EP 2, EP 3 and EP 4) were the extended unit plans that balcony areas were turned into living areas. All of them were simulated with ECO2 software to assess building energy efficiency. Result: According to the results, the energy performance of the EP 2 and EP 4 models were 21. 8% higher than SP 1 model and 9.2% higher than SP 2 model.

• KIEAE Journal
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• 제14권3호
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• pp.39-45
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• 2014

Energy poverty has been defined as low-income households who paid energy cost more than 10% of their ordinary income. Therefore, there are various subsidy programs focused on house remodeling for low-income households and one of them is the Home Energy Efficiency Assistance Program which have done by Korea Energy Foundation since 2007. The aim of the program is to improve the thermal performance of dilapidated dwellings and analyzed the detached house for the low-income households to develop the building typology. The database contained approximately 3,061 households which was obtained from the program in 2013 and the results of the study were like this; 1) For the shape of residential houses, the number of rectangular shaped building was higher than non-rectangular shaped ones. 2) For the orientation of buildings, the south layout of the detached housing was dominant to gain heating energy into buildings. 3) For the floor area, the average floor area was $44.2m^2$, although its size varied wide variations, which range from $6.3m^2$ to $107.1m^2$. 4) For the windows and doors, the south-facing window was larger than the other side. Finally it would be possible to determine the characteristics of residential houses for low-income families. A future study could establish typology of low-income housing that it would estimate the performance of each model building before and after the retrofit to improve the energy performance.

• 한국주거학회논문집
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• 제28권1호
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• pp.37-44
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• 2017

This study focuses on the university dormitory remodeled toward energy efficiency. The study has its purpose on deriving the aspects to be concerned for later green remodeling and enhancing the effects of green remodeling, by analyzing the changes of physical environment, changes of energy consumption amount, and needs of the residents. For this purpose, the study went through the review of project report from government office for green remodeling, field investigation of remodeling elements, and the occupancy evaluation by Focus Group Interview. FGI means interviewing small group of the residents who lived in the subjected dormitories both before and after the remodeling. As results, the elements of green remodeling in targeted dormitories were inner wall insulation, top-floor ceiling insulation, replacement of windows, installment of automatic entrance door and making transfer space connected the entrance door. As the parts of equipment system, EHP high-efficiency cooler, highly efficient radiator, upgraded LED lightings with covers, and automatic control system (only one building) were installed. Energy consumption was declined, and the satisfaction of residents was increased after the green remodeling. However, the aspects which were not improved or unsatisfying also have been detected. Therefore, the study states the suggestions each for the administrators, designers and planners, and residents to concern for enhancing the effects of green remodeling or construction of new dormitories.

• 에너지공학
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• 제23권1호
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• pp.40-45
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• 2014

주거시설에서 환기횟수 0.7회 적용은 실내공기질 향상과 거주자의 쾌적성을 높이고자 100세대 이상은 의무적으로 적용하고 있다. 건축물에너지효율등급에서는 환기횟수를 기준으로한 기밀시험을 실시 하여 그결과 값을 효율등급결과치에 반영함으로서 창호주변의 정밀시공을 유도하고 침기로 인해 손실되는 에너지절감을 꾀하고 있다. 건축물엔지효율등급 현장실사 결과 환기횟수가 0.6~0.71까지 나타났으며 그차이가 에너지 절감량에 크게 영향을 미치는 것으로 나타났다. 유럽의 패시브 하우스 기준이 0.6회 이하의 기밀을 요구하고 있고 우리나라도 2017년 패시브하우스, 2025년 제로하우스를 목표로 하고 있어 비주거 건물의 기밀진단의 의무확대와 고기밀 건물에 대한 연구와 시공방법이 시급한 실정이다.

• 사물인터넷융복합논문지
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• 제6권1호
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• pp.23-30
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• 2020

본 논문에서는 주택이나 건물의 에너지 손실 요인을 발견하고 이를 개선하기 위한 방안을 도출하기 위한 에너지 관리 방향을 제시하고 있다. 대중성과 편의성이 큰 강점인 스마트폰 탈부착형 열화상 카메라를 주택 전문가들만이 아닌 일반인들이 생활 속에서 활용할 수 있도록 생활 속 활용 진단 콘텐츠 앱을 설계하였다. 이 앱을 활용한 진단 결과를 에너지 효율 진단 솔루션인 에너지 파인더를 이용하여 분석하였다. 에너지 복지 사각지대 주민 및 시설 중 특히 지역 노인들이 자주 이용하는 경로당을 대상으로 진단 조사하였다. 진단 대상은 전라남도 나주시에 위치한 경로당 600여개소 중 15년 이상 노후 시설 30개소를 선정하여 에너지 효율 진단을 실시하였다. 진단 결과는 전반적으로 양호한 편이었지만, 7등급으로 분류된 곳은 에너지 효율 개선을 위한 보완이 필요하다고 판단된다.

• 한국주거학회논문집
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• 제21권1호
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• pp.1-9
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• 2010

Housing problems in city have being caused social contradiction that contains social discord and conflict between poor and rich. And they have raised one of social problems including a disequilibrium of demand and supply, a housing trouble, and a poor residential environment. Therefore, the purpose of this study is to suggest to the improvement of social housing that exposes to a poor environment for social integration. For this, this study is to extract environmental-friendly design factors for each building phase by in-depth evaluation of experts, and to analyze the problems of domestic social housing and environment-friendly design factors considered prior literature. The results as follow. It might be considered highly phase of schematic design, The building construction, and performance management having factors. Specially, it analyzed to 'Living Environment', 'Economic Efficiency', and 'renewable Energy Systems' should be considered highly. Ultimately, this study would be reconsidered the improvement of social housing proposed by the Government for the social outcast.

• 에너지공학
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• 제24권1호
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• pp.88-96
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• 2015

기어펌프는 단순한 구조를 가지면서도 신뢰성이 높고 작동과 유지가 쉽기 때문에 수력학 장치에 널리 사용된다. 일반적으로 기어펌프는 질량유량과 효율을 고려한 다양한 변수에 의해 설계된다. 본 연구에서는 기어펌프의 최적화 설계를 위해 ANSYS v15.0 CFX 상용프로그램을 사용한 3차원 유동해석을 실시하고 해석결과로부터 설계변수를 선정하도록 하였다. 즉, 기어펌프의 다양한 회전 속도 및 기어 끝단과 하우징 사이의 간극에 대한 질량유량 및 효율을 검토하였으며, 해석 결과로서, 회전 속도가 증가할수록 평균 질량유량 및 효율은 증가하였고, 기어펌프와 하우징의 간격이 증가할수록 평균 질량유량 및 효율은 감소하였다.

• KIEAE Journal
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• 제11권2호
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• pp.35-44
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• 2011

Many countries have run their own certification systems in order to reduce the environmental loads from buildings. Domestically, various systems are applied according to building types from Building Energy Efficiency Rating System since 2001 to Green Home Construction Standard and Performance since 2009. However, these systems provide the applicants with confusion and waste by exposing them to several systems simultaneously, some of which are mandatory. Therefore, this study aims to ensure the flexibility among those systems and eliminate the possible waste by suggesting mutual accreditation method of evaluation results. To achieve this purpose, firstly, the thirteen similar evaluation items are identified between Housing Performance Grading Indication System and Green Building Rating System. Then, the mutual accreditation method is developed by comparing detailed evaluation criteria and credits for those thirteen items.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.474-479
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• 2007

The innovation city, which meets the best innovation condition to cooperate with the public institution and the industry-university-researcher closely and the good environment of housing, education, health and culture, was promoted to make the local city characteristic and independent. The plan to make the locally independent base have to consider the economical condition, the quality of life and the sustainable development. First of all The balanced city-planning is demanded to build friendly environmental and sustainable city. energy-efficient buildings shuld be designed to deal with the energy and environment problem. So we analyze the energy demand plan and the method to introduce the renewable energy system. As a result, the reduction ratio of the energy demand are greatly imbalanced between innovation cities. and only the Gwang-ju Jeon-nam innovation city is planed to apply the renewable energy to 5% of total energy demand.

• 한국기계가공학회지
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• 제21권3호
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• pp.63-69
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• 2022

Compressor efficiency must be improved to reduce refrigerator power consumption. In this study, the heat dissipation rate through the compressor housing is increased via gap flow passages between the compressor body and housing. Four types of gap flow passages are considered for achieving the maximum heat-dissipation rate. In addition, thermal analysis is performed to examine the effect of increased heat dissipation rate on the energy efficiency ratio (EER). The results show that the heat dissipation rate, compressor superheat, and compressor EER increased by up to approximately 52%, 3 ℃, and approximately 1%, respectively.