• 한국기후변화학회지
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• 제8권1호
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• pp.21-30
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• 2017

Recently, There has been much discussed about unused space. This space can be used in a variety of ways. Utilizing it as a facility, craft shop, and utilizing renewable energy generation facilities. Especially, in terms of climate change should be supplied renewable energy. Renewable energy needs to be developed in terms of responding to climate change, and the recent Paris agreement is also emphasizing the importance of renewable energy. In particular, renewable energy needs to be widely disseminated. And renewable energy is limited space. In this regard, idle land can provide opportunities for securing new renewable energy generation facilities. The introduction of new and renewable energy facilities in idle space can enhance the self-sufficiency rate of the local community, which is significant in terms of responding to climate. In this study, to investigate the possibility of utilizing a unused space for a photovoltaic power generation facility, we investigated the amount of electricity which could be generated through photovoltaic power generation, and the economic effects, using a RETScreen model. The results showed that 9,738 MWh of power can be generated and that $4,540tCO_2eqcan$ be saved. Regarding the economic effect, the net present value of the facility was shown to be 2,247,389,020 KRW. As the net present value was shown to be positive, we believe that the installation of a photovoltaic power generation facility in an unused space would have a positive economic effect. We found the net present value following the fluctuation of the SMP price to be positive, though there was some variation. However, as the economic efficiency was shown to be low because the net present value in relation to the maintenance costs was negative, we believe that maintenance costs must be taken fully into account when evaluating economic efficiency. In particular, as subsidies can be used to cover maintenance costs which must be factored into photovoltaic power generation, we believe that photovoltaic power generation can have an economic effect. Because spaces not currently in use can have a positive economic effect as renewable energy power generation facilities, and can also contribute to the reduction of greenhouse gas emissions, unused spaces are thought to greatly help local governments to cope with climate change as well as reinforcing their related capabilities. We believe our study will help local governments with decisions relating to unused real estate utilization in the future.

• 대한기계학회논문집A
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• 제35권4호
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• pp.447-452
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• 2011

일반적으로 화력발전 터빈 로터나 케이싱과 같이 고온 고압에서 운전되는 설비의 경우 크리프 및 피로 손상이 주된 손상기구로 알려져 있다. 터빈 설비의 수명을 정확하게 예측하기 위해서 크리프 및 피로 손상 기구를 복합적으로 고려해야 하지만 500MW 급 대용량 터빈 설비의 경우 기저 부하를 담당하기 때문에 기동횟수가 많지 않고 고온에서 장시간 동안 안정적인 운전을 하므로 잔여수명을 결정할 때 크리프 수명을 주로 사용한다. 국내에서 20 년 넘게 운전되고 있는 대용량 터빈의 경우 대부분 니켈, 크롬, 몰리브덴, 바나듐 성분이 포함한 재료로 되어 있다. 본 논문에서는 대용량 터빈의 크리프 수명을 예측하기 위하여 1Cr1Mo1/4V 터빈 로터강에 대한 크리프 손상 모델을 제안하고자 한다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 추계학술대회 논문집
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• pp.33-37
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• 2004

Photovoltaic energy and wind energy are highly dependent on the season, time and extremely intermittent energy sources. Because of these reasons, in view of the reliability the photovoltaic and the wind power generation system have many problems(energy conversion, energy storage, load control etc.) comparing with conventional power plant. In order to solve these existing problems, hybrid generation system composed of photovoltaic(500W) and wind power system(400W) was suggested But, hybrid generation system cannot always generate stable output due to the varying weather condition So, the auxiliary power compensation unit that uses elastic energy of spiral spring was added to hybrid generation system for the present study. It was partly confirmed that hybrid generation system was generated a stable outputs by spiral spring was continuously provided to load.

• 산업경영시스템학회지
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• 제46권3호
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• pp.101-108
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• 2023

Although the proportion of coal-fired power generation is decreasing, efficient operating technology is needed to continuously invest in facilities and reduce maintenance costs until it is abolished. Boilers, one of the main facilities of power plants, operate for a long time in harsh environments of high temperature and high pressure. In addition, damage due to deterioration is likely to occur depending on the fuel and tube material used. It is very important to judge soundness because damage caused by deterioration adversely affects facility operation. Previously, replication method was used to analyze the progress of deterioration. In the replication method, pre-treatment such as chemical treatment is performed on the boiler tube in the field, the area is reproduced by attaching a film, and the replicated film is determined by an expert in the laboratory with an expensive microscope. However, this method involves substantial costs and time requirements, as well as the possibility of human errors. To address these issues, we developed a mobile health assessment system in this research. Since it is detachable and takes images in real time, this system enables swift evaluations across a broad range and facilitates the assessment of preprocessing quality. In addition, it was intended to reduce existing human mistakes by developing a degradation classification algorithm using the merger cluster method.

• 한국태양광발전학회지
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• 제4권2호
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• pp.45-53
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• 2018

Natural gas demand for power generation continued to increase until 2013 due to the expansion of large-scale LNG power plants after the black-out of 2011. However, natural gas demand for power generation has decreased sharply due to the increase of nuclear power and coal power generation. But demand for power generation has increased again as energy policies have changed, such as reducing nuclear power and coal power plants, and abnormal high temperatures and cold waves have occurred. If the gas pipeline pressure can be properly maintained by predicting these fluctuations, it can contribute to enhancement of operation efficiency by minimizing the operation time of facilities required for production and supply. In this study, we have developed a regression model with daily power demand and base power generation capacity as explanatory variables considering characteristics by day of week. The model was constructed using data from January 2013 to December 2016, and it was confirmed that the error rate was 4.12% and the error rate in the 90th percentile was below 8.85%.

• Journal of Advanced Marine Engineering and Technology
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• 제32권8호
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• pp.1123-1128
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• 2008

Marine facilities like buoy, lighthouse are operated with stand alone power supply system. This power system can consist of a stand-alone type power system such as PV(Photovoltaic) system, wave system or hybrid system which is not cooperated with a commercial power system. Generally, PV power system for marine facilities can not supply a sufficient power to buoy, because it is so influenced from weather condition. For solving this problem the hybrid power system with PV and wave is studied on a various area, that is why a hybrid power system is requires to overcome these problems. This paper will describe a generation characteristic of WEC(Wave Energy Converter) for buoy, and an AFS(Anti-Fouling System) influence on WEC.

• 한국전자통신학회논문지
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• 제16권6호
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• pp.1339-1348
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• 2021

재생에너지 출력제한은 송전용량과 전력계통 안정성 부족을 포함하여 다양한 원인이 있다. 제주도 지역에서는 태양광 및 풍력 발전설비의 증가로 이미 전력수요에 비해 공급이 많아지는 사례가 자주 발생하고 있으며, 이에 따라 풍력발전의 출력제한 횟수가 증가하고 있다. 본 연구에서는 제주도 전력공급의 핵심 역할을 담당하고 있는 HVDC(고전압 직류)와 BESS(배터리 에너지 저장장치) 설비를 활용하여 재생에너지의 효과적인 수용과 전력계통의 안정적 운영 방향을 찾는 것이다. 그리고 이 논문에서는 각 설비들의 실질적인 운전방안을 제시하고 향후 태양광 및 풍력 발전설비의 확대에 따른 육지 전력계통의 운영 방향을 제안한다.

• Journal of Advanced Marine Engineering and Technology
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• 제35권6호
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• pp.835-841
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• 2011

해상에서 운영되는 해양 시설물용 파력 발전시스템은 대용량 계통 연계형으로 개발되어 왔다. 그러나 등부표용 파력 발전시스템에는 소용량의 발전시스템이 운영 측면에서 효과적이다. 소형 파력 발전의 경우 단순히 전파 정류하여 축전지에 충전하는 방식(직결 방식)을 주로 사용한다. 본 논문에서는 소형 웰스터빈의 발전 특성을 고려하여 부스터 컨버터 기반의 파력 발전전력제어기를 개발하였다. 직결 방식과 부스터 컨버터 방식의 제어기를 설계하고, 실험을 통하여 그 특성을 비교하였다. 실험 결과 제안하는 제어기가 발전기의 출력전압이 낮은 구간에서 출력특성이 개선되었다.

• 환경위생공학
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• 제15권4호
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• pp.78-83
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• 2000

The emission factor of nitrogen oxides(NOx) was evaluate to clarify the characteristics of NOx emitted from seven large combustion facilities in seoul area. The emission factors of NOx at A-1 and A-2 facilities of internal combustion engine were 66.957kgNOx/ton and 20.913kgNOx/ton, respectively. The emission factor of A-1 facility was higher than that of A-2 facility even same internal combustion engine, because A-1 facility adopted SCR(selective catalystic reactor) for reduction of NOx emission factor of A-2, A-4, and A-7 power generation boiler facilities were 4.300kgNOx/ton, 2.460kgNOx/ton and 1.796kgNOx/ton, respectively. The capacity of A-2 facility was about two times than that of A-4 and A-7. These emission factors were lower than those at facilities in other areas of korea, because of using low NOx burner of power generation boiler. The emission factors of NOx at A-3 and A-6 incinerator facilities were 0.147kgNOx/ton and 0.221kgNOx/ton which were lower than other facilities, respectively, because these facilities incinerate municipal solid waste of low heating value and uwe SCR for reducing NOx concentration.

• 교육시설 논문지
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• 제18권6호
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• pp.25-32
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• 2011

The building integrated photovoltaic(BIPV) system has a double advantage that it reduces costs for exterior materials and PV panels. It allows the construction of a low-energy building without the need for the additional installation space. At the construction planning stage, however, it requires sufficient evaluation on the efficiency and performance. This study was performed to promote the distribution of photovoltaic power generation system by estimating the potential photovoltaic power generation capacity of the BIPV system installed on the university lecture building and by evaluating the characteristics and performances of window, spandrel and combined attachment types via the simulation of generation capacity per unit area.