• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.5 no.3
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• pp.291-299
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• 2015

With recent surge of attention to heating and air conditioning energy consumption, the need for evaluating performance of heating and air conditioning energy is also on the rise. This research aims to propose daily-life based evaluation method as an alternative to existing one, as well as to apply the method in real life to prove its validity. The results are as following. 1) I studied temperatures preferred by persons indoors and appropriate level of temperature, and the results show that properties of such persons such as age is directly linked with pleasantness of the room, but the issue lies with the fact that such properties are not considered in existing performance evaluation of heating and air conditioning. 2) Daily life based evaluation proposed herein reflects such properties of persons indoors. It controls heating / air conditioning devices installed in the test bed with the same size as a real life room to get quantitative and visual performances in our daily life as well as simple temperature information. 3) To verify validity of daily life based evaluation, I conducted different evaluation sessions with and without a blind and also based on ages of persons indoors. Results based on properties of persons showed difference of 77.6%, leading to effective analysis of energy consumption pattern by heating / air conditioning devices. This research takes significance in that it comes with a new performance evaluation method based on real life, and I gather that further studies are required to develop more multilateral performance evaluation in order to verify and improve technology for reduction of energy consumption.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.28-32
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• 2007

최근 대두되고 있는 에너지 문제와 더불어 대체에너지 개발 및 에너지의 이용효율을 높이려는 연구가 많이 이루어지고 있다. 수소에너지는 비 탄소계 연료로서 그 중요성에 대한 인식이 높아지고 있으며, 다양한 분야에서 수소에너지를 이용하기 위한 노력이 이루어지고 있다. 수소는 재순환이 가능하고, 환경에 미치는 영향이 적기 때문에 미래형 에너지원으로 각광을 받고 있다. 수소이용 기술 중 연료 전지는 에너지 변환효율이 높고 유해 배출물이 생성되지 않아 차세대 발전시스템으로 유망하지만 비용과 기술적 제약으로 단기간에 상용화하기에는 어려움이 있다. 따라서 저비용, 고효율의 수소에너지를 이용 할 수 있는 시스템 개발이 요구되고 있다. 리니어동력/발전시스템은 저비용으로 제작이 가능하고 기존 기술의 인프라를 활용할 수 있는 장정과, 크랭크 기구가 없기 때문에 얻어지는 변환손실, 열손실을 최소화 할 수 있는 효율의 장점 때문에 고효율의 수소 이용 기관으로 평가되고 있다. 본 연구에서는 수소이용 통력시스템의 직선운동을 전기적인 에너지로 변환 할 수 있는 고효율의 리니어 발전시스템 개발을 위해 Prototype의 평판형 및 원통형의 리니어발전기를 제작했고 각각의 성능에 대한 평가와 엔진과 발전기의 연계운전 결과를 비교하여 시스템 전체에 대한 성능예측을 했으며 연계운전을 통해 출력된 발전기의 출력파형을 PCS로 변환하여 정현파의 AC 출력을 얻었다.

• 에너지협의회보
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• s.38
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• pp.66-73
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• 1996

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.750-753
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• 2013

In respect of consuming energy, the optimization is the main objective in the solar energy harvesting sensor system (while battery-based sensor system aims at the minimization), due to the periodicity of solar energy. Aimed at the optimization of the network topology, we suggest 3-level transmission power control algorithm of which level is determined by the amount of residual energy on the rechargeable battery. Additionally, we experiment the effects of our scheme on network-wide performance such as the latency and the duty-cycle, and verify that our scheme shows the best performance in most of the metrics, compared to the schemes with fixed transmission power.

• Land and Housing Review
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• v.7 no.3
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• pp.131-136
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• 2016

The aim of this study was to improve the performance of hybrid energy harvesting block merge the vibrations and the pressure developed in the previous study. The power generation performance of the energy block improved in this manner was measured and compared with the energy performance of the products previously developed. In previous models, the center has placed a piezoelectric, the two sides had arranged a vibration applying electromagnetic inducing type. Improved model was disposed three in a row of three unit modules for one block. We change the design in the following way. That is, a unit module has been placed the upper piezoelectric body, the lower portion were arranged three electron donation. In laboratory conditions, the power generation performance evaluation results of the improved energy block is as follows. Once when the vibration, power generation was determined to 1.066W. When compared with previous studies, and power generation performance is improved up to 235%. When the vibration in a row 5, power generation was determined to 1.830W. When compared with previous studies, the performance is improved to 177%. The purpose of developing a hybrid energy block is intended to produce electricity by the pressure and vibration when a vehicle passes through the energy block installed in the car park the mouth portion. Electricity produced will try to take advantage of for the purpose of operating a guiding beacon and LED signage in the parking lot entrance. Therefore, it is determined that there is a need in the experiment to compare the performance of the power generation in the field.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.11a
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• pp.215-218
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• 2002

본 연구는 휴대 전자기기용 전원으로 사용 가능한 직접 메탄올 연료전지(Direct Methanol Fuel Cell)의 조건에 따른 성능 특성에 관하여 연구를 하였다. 메탄올은 사용함에 안전할 뿐 아니라 에너지 밀도 또한 월등함으로 DMFC를 통해 전기에너지로 변환시킬 경우 휴대용 기기의 전원으로 사용함에 있어서 기존의 베터리를 대체할 가능성이 있는 에너지원으로 연구되어지고 있다.(중략)

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.635-637
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• 2016

센서 네트워크에서 각 센서 노드의 에너지 소모를 최소화하여 에너지 소모를 줄임으로써 망의 지속시간을 늘이는 것이 중요하다. 기존의 MAC(Medium Access Control) 프로토콜은 채널 폴링 기법을 이용하여 효율적인 에너지 관리에 대한 해결책을 제시 하였으나, 그러한 방식에 따른 각 노드의 Duty Cycle이 길어짐으로써 발생하는 에너지 소모에 대한 해결책은 제시하지 못하였다. 본 논문에서는 기존의 채널 폴링과 함께 스케쥴링 알고리즘을 적용하여 Duty Cycle의 주기를 줄임으로써 에너지 소모를 줄인다. 특히 이 방식을 이용하여 멀티홉과 과다한 트래픽에 대한 성능의 평가를 위해 실험을 통해 제안하는 프로토콜의 우수한 성능을 보인다.

• Journal of Energy Engineering
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• v.9 no.3
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• pp.237-242
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• 2000

에너지 회수를 위한 변형 흡수 열 펌프 연구를 메탄올-글리세린을 이용하여 수행하였다. 이 물질의 상 평형 열역학 데이터를 이용하여 변형 흡수 열 펌프의 이론적 성능계수 값을 각 기관의 조업 조건에 따라 계산하였다. 70~8$0^{\circ}C$의 공업 폐열 온도를 가지고 4$0^{\circ}C$ 온도상승 시킬 때 성능계수 50% 이상을 얻을 수 있었다.

• Korean Journal of Construction Engineering and Management
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• v.16 no.5
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• pp.105-113
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• 2015

In order to evaluate the energy performance of buildings, it is important to determine reliable information of energy utilization during operating phase. It is also required to establish the database which have the amounts of population deducted by objective filtering and analysis. In this study, all energy sources were applied to evaluate synthetically the energy performance of Multi-Family Housings(MFH) using district heating and the amounts of population were obtained sufficiently through data searching in Seoul and neighbor cities. Finally the database of source energy utilization and $CO_2$ emission in 325 MFH complexes were established through cross validation between data sources and statistical analysis. Additionally, further ideas have been proposed to improve existing MFH Management Information System.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.603-613
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• 2021

As a core policy for achieving the goal of reducing greenhouse gas emissions in the building sector, Korea has enforced the mandatory certification of zero energy buildings for new public buildings from 2020. This study suggests energy-saving technologies and economic factors that building officials can refer to for decision-making on the implementation of zero energy buildings. For this study, the construction cost for the energy item of a building was analyzed by collecting the building energy efficiency level certification data and detailed construction cost statement data from public institutions for the last three years. Based on the building energy efficiency certification data, each energy item of the baseline building was derived, and the energy performance of the zero energy building was derived through repetitive simulations by gradually increasing the energy performance value of the baseline building. By applying the analyzed construction cost, the construction cost for each energy item of the baseline and zero energy buildings was derived. As a result, the lighting equipment contributed up to 10.5% energy savings, and the increase in construction cost of the cooling and heating system was at least 9.1%.