• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.605-606
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• 2012

The cost of a PV(Photovoltaic) installation are driving the market and the need for subsidized schemes, such as feed-in tariffs. Concentrated photovoltaic(CPV) is leading the development of future low cost renewable energy sources. CPV is offering high efficiency systems. This paper proposes technology and market for CPV.

• 한국건축시공학회지
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• 제14권6호
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• pp.583-590
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• 2014

본 연구에서는 경제적인 창호공사 방안을 확인하기 위해 단열필름이 시공된 창호유리와 일반유리의 생애주기비용을 분석하여 비교하고자 하였다. 이를 위해 Window 6.3과 ECO2-OD 시뮬레이션 프로그램을 사용하여 유리 유형별 창호의 열성능 데이터를 측정하고 사례 건물에 적용하여 냉 난방 유지비용 및 LCC를 산출하여 경제성을 비교하였다. 연구결과 단열필름을 추가적으로 시공함으로써, 냉 난방 유지비용 측면에서는 하절기 태양열이 실내로 투과하는 것을 막아 냉방비용 절감 효과가 있지만, 이로 인해 동절기에는 난방비용이 증가하는 것으로 나타났다. 생애주기비용 측면에서 볼 때, 냉방비용 절감 효과가 난방비용 증가량과 필름 시공 및 수선으로 발생하는 추가비용을 상쇄하지 못하기 때문에 단열필름의 시공은 적절한 방법이 아니라고 할 수 있다.

• 대한환경공학회지
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• 제22권11호
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• pp.1945-1954
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• 2000

접촉폭기방식 중수도를 설치할 때 발생하는 비용과 편익의 현재가치를 이용한 경제성분석을 통해 서울특별시와 6개 광역시의 지역별 설치규모분석을 수행하였다. 사적 편익을 고려한 접촉폭기방식 중수도의 설치규모는, 가정용일 경우, 부산은 일일 중수사용량이 $500m^3$, 대구는 $1,000m^3$ 및 광주는 $2,000m^3$ 이상일 때 경제성이 있는 것으로 나타났다. 그러나 서울, 인천, 대전 및 울산은 $3,000m^3$ 이상에서도 경제성이 없어 단독공급 방식보다는 대단지 공동주택의 지역순환방식으로 시설을 설치해야 할 것으로 판단된다. 업무용의 경우 서울, 부산 및 광주는 일일 중수사용량이 $100m^3$ 이상, 대구, 인천, 대전 및 울산은 $300m^3$ 이상일 때 경제성이 있다. 영업용의 경우 서울, 부산, 대구, 광주, 대전 및 울산은 중수사용량이 $100m^3$ 이상이고 인천은 $300m^3$ 이상일 때 경제성이 있는 것으로 나타났다. 사회적 편익을 고려한 접촉폭기방식 중수도의 설치규모는 일일 중수사용량이 $100m^3$ 이상일 때 경제성을 갖는 것으로 나타났다.

• 조명전기설비학회논문지
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• 제28권3호
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• pp.72-77
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• 2014

The cross-section area of cable in the Offshore Wind Farm (OWF) is smaller than that in the onshore wind farm. Because the power loss in OWF is large relatively, the power loss is a key element for the economic evaluation of OWF design. The availability of wind turbine in OWF and the size of OWF are larger than those of onshore wind farm. If the economic evaluation of OWF ignores the availability of wind turbines, the power loss cost of OWF is overpriced. Since there are so many wind turbines, also, the calculation of power loss should be more accurate. In this paper, a method to calculate power loss is proposed for the design of big and complex inner-grid in OWF. The 99.5MW OWF is used for case study to see what effect the proposed method have on the power loss cost.

• 조명전기설비학회논문지
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• 제27권11호
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• pp.89-95
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• 2013

In resent years, Offshore Wind Farm (OWF) is being actively developed. Typically, OWF has a better wind resource than onshore one, but also have a very high investment cost and maintenance cost. Furthermore, due to a difficulty of geographical access, OWF can be affected by the failure for a longer time. As the result, OWF has a higher loss cost. Therefore, a reliability evaluation should be performed more carefully at OWF planning stage. In this paper, a methodology for the reliability evaluation on inner grid is suggested. Inner grid connects wind turbines via submarine cables and transfers power to offshore substation. According to location of the faulted cable under layouts of inner grid, the transfer ability of inner grid is influenced. In order to indicate the transfer ability of inner grid, several indices are introduced such as PNDR, EEND and EENDC. To demonstrate the methodology described in this paper, diversity case studies were performed.

• 대한조선학회논문집
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• 제47권2호
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• pp.258-264
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• 2010

Various kinds of ballast water treatment systems (BWTS) have been developed corresponding to reinforced IMO rules for marine environment. Some of them got the certificate of IMO and others are waiting for it. Selection of optimum BWTS is very important. Optimum BWTS means not only functional requirements but also economic efficiency. This paper presents economic analysis model for optimum BWTS according to ship type and size. In this study 10 kinds of BWTS whose initial installation cost and maintenance cost are known are analyzed based on present worth method. It is assumed that all BWTS satisfy minimum functional requirements and we need to consider different economical efficiency. Through the economic analysis we could select optimum BWTS.

• 전기학회논문지
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• 제64권4호
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• pp.640-645
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• 2015

Near surface transit system has should be constructed as installation cost of light rail transit with elevated track. So, distance between two substations is longer than conventional system. The long feeding distance results in severe voltage drop. This paper proposes a PWM rectifier instead of diode rectifier. The PWM rectifier has some advantages. This is able to control output voltage constantly to reduce voltage drop and to use regeneration power without additional inverter. This paper analyse on improved voltage profile and cost of substation with PWM rectifier. The analysis of voltage profile use PSIM, and the installation cost of substation with PWM rectifier is compared to substation with diode rectifier.

• 조명전기설비학회논문지
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• 제22권10호
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• pp.97-103
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• 2008

최근 가전제품에 브러시리스 직류 (Brushless DC) 전동기의 센서리스 드라이브를 적용시키는 사례가 증가하고 있다. 특히 사람들의 삶의 질이 향상 됨에 따라 가정에서 가장 밀접하게 연관되어 있는 냉장고, 에어컨과 같은 가전제품에 가청소음을 줄여 보다 편안하고 안락한 생활을 추구하고 있다. 본 논문에서는 브러시리스 직류전동기에 랜덤 PWM을 적용한 냉장고용 압축기의 저가형 센서리스 드라이브를 이용하여 기존 드라이브 보다 가격과 소음을 줄일 수 있음을 실험하였다. 이러한 실험으로 전자적 소음을 줄임으로써 소음에 질을 향상시킬 수 있음을 확인할 수 있었다.

• 조명전기설비학회논문지
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• 제29권8호
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• pp.83-89
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• 2015

This study suggests the methodology to decide the number and adequate capacity of substation transformer in a large-scale offshore wind farm (OWF). The recent trend in transformer capacity of offshore substation is analyzed in many European offshore wind farm sites prior to entering the studies. In order to carry out the economic evaluation for the transformer capacity we present the cost models which consist of investment, operation, and expected energy not supplied (EENS) cost as well as the probabilistic wind power model of wind energy that combines the wind speed with wind turbine output characteristics for a exact calculation of energy loss cost. Economic assessment includes sensitivity analysis of parameters which could impact the 400-MW OWF: average wind speed, availability, discount rate, energy cost, and life-cycle.

• 신재생에너지
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• 제8권3호
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• pp.23-29
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• 2012

LCOE of 11 Korean PV projects, total capacity of 44 MW, were calculated for each project being larger than 1 MW respectively. 9 out of 11 projects were constructed in 2008 under FIT scheme revealed that average LCOE is 600 Korean Won per kilowatt-hour and it becomes reduced to 348 Korean Won per kilowatt-hour for 2 projects that are constructed under RPS scheme in 2012. During the period between 2008 and 2012, installation cost per megawatt became 55% of 2008 value with operation and maintenance cost lowered to 80% while LCOE became only 58% due to reduced project size and lower irradiation for later projects. However, it is found that the ratio of LCOE / unit installation cost looks relatively constant, so that it can be used as an auxiliary parameter to gauge learning effect of BOS portion of a PV project.