• Title, Summary, Keyword: Economic evaluation

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Economic evaluation of domestic biowaste to ethanol via a fluidized bed gasifier

  • Gwak, In Seop;Hwang, Jong Ha;Sohn, Jung Min;Lee, See Hoon
    • Journal of Industrial and Engineering Chemistry
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    • v.47
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    • pp.391-398
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    • 2017
  • The economic evaluation of a biomass to ethanol process using a fluidized bed gasifier was conducted by using domestic biowastes. In this work, we chose two different scale processes because collecting biowastes was considered as one of biggest bottlenecks. Economic evaluation was conducted using internal rate of return, net present value and ethanol prices. NPVs from a 2000 dry-ton/day process and two 1000 dry-ton/day process ranged from 47.9 million dollars and 69.5 million dollars in same IRR of 10%. The construction of a 2000 dry-ton/day scale plant might be more economical than two 1000 dry-ton/day scale plants because of lower ethanol prices.

Modeling of Battery Energy Storage System at Substation for Load Leveling and Its Economic Evaluation (부하 평준화를 위한 변전소 설치 배터리 에너지 저장장치의 모델 및 경제성 평가에 관한 연구)

  • Cho, Sung-Min;Shin, Hee-Sang;Kim, Jae-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.7
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    • pp.950-956
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    • 2012
  • As development of battery technologies, the installation of Battery Energy Storage System (BESS) increased. The BESS can be used for various purposes such like frequency response, load leveling, and fluctuation mitigation of renewable energy generators. In this paper, three state BESS model is proposed. the BESS model considering charge, discharge and keeping efficiency, and life cycle according to depth of discharge (DOD). Then, the benefit and cost of BESS installed at substation for load leveling are summarized. The economic evaluation of BESS is analyzed using net present values (NPV) analysis. In case study, the NPV analysis of NaS battery system is carried out using the proposed BESS model. Because the result of economic evaluation of BESS using nowadays cost data is not positive, the sensitivity analysis of BESS is conducted by changing the capital cost and energy cost.

Economic Evaluation of Offshore Wind Farm in Korea (국내 해상풍력발전단지의 경제성 분석)

  • Min, Chang-Gi;Hur, Don;Park, Jong Keun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.9
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    • pp.1192-1198
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    • 2014
  • With an increase in the penetration of offshore wind farm, the need of an accurate economic evaluation of offshore wind farm has become crucial. This paper presents an economic evaluation method of offshore wind farm in Korea reflecting the cost of offshore wind farm infrastructure (offshore substation, submarine cable and foundation) in its cost model. Each cost of offshore substation, submarine cable, and foundation is represented as a function of installed capacity, distance to shore, and water level, respectively. We have applied the method to the case study of offshore in Jeju Island and analyzed the economics under various conditions. The results show that the distance to shore is of importance in economics of offshore wind farm.

A study on the Economic Evaluation of Trunk using Teletraffic (통화량을 이용한 중계선의 경제성 평가에 관한 연구)

  • Yoo, Tae-Yol;Kim, Jae-Yeol;Lee, Sang-Il
    • Proceedings of the KIEE Conference
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    • pp.889-893
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    • 1987
  • This paper suggests a model for the economic evaluation and the selection of alternatives using teletraffic. Economic evaluation is analyzed by the comparison of revenue loss which happens without trunk extension and additional revenue which results from trunk extension. Simulation technique is used as a methodology to apply economic evaluation to telephone system. The study results will provide a support in a optimal decision about investment strategies.

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Economic Evaluation Method for Photovoltaic System Development using Insolation Data Analysis (일사량 데이터 분석을 통한 태양광발전 시스템 개발을 위한 경제성 평가 방법)

  • Lee, Sung-Hun;Choi, Hyeong-Cheol;Lee, Dong-Keun;Kim, Jin-O
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.10
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    • pp.38-46
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    • 2011
  • Recently, interests in renewable energy have gradually increased. Of various renewable energy, Photovoltaic system has the properties affected by weather. This paper discusses the economic evaluation based on insolation data analysis. Real insolation data were obtained by radiation measurement device installed in projected photovoltaic system site during 20 months. Obtained real insolation data were standardized using clear day analysis. Standardized data are greater than obtained real insolation data and were used as parameters of RETScreen for the economic evaluation. In results, capacity(30[kW]) of soon cheon is shown the most B/C(1.20). Applied methods have effectively done to develop photovoltaic system.

A Study on the Economic Evaluation Model of Splice of Reinforcement Bar(SD500) (초고강도 철근이음의 경제성 평가모델 개발에 관한 연구)

  • Kim, Jae-Yeob;Kim, Dae-Won
    • Journal of the Korea Institute of Building Construction
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    • v.8 no.1
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    • pp.71-76
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    • 2008
  • Recently, the high-rise apartment housings have become a prototype of the urban residential dwelling in Korea and the numbers of one have steadily been increasing. According to this trend, the strength of the construction materials is also fortified to assure the stability and durability of the buildings. Specially, Re-bar of SD500 type is largely used at the construction sites of high-rise building. This study analyzes the current usage of SD500 high-strength re-bar at domestic construction sites. Through the result of this analysis, we develop Economic Evaluation Model that measure economic efficiency of lap splice and coupler splice, which are most commonly used in connection SD500. The evaluation method was applied to construction sites in Seoul in December 2006, and the result revealed that coupler splice is relatively superior in terms of cost efficiency when the re-bar diameter is longer and the concrete strength is lower.

Economic Evaluation of Duck Using Houttuynia Cordata As Feed Additives -A Field Study- (어성초 분말을 사료첨가제로 첨가시 오리경제성 평가 -현장연구를 중심으로-)

  • Choi, In Hag
    • Journal of Environmental Science International
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    • v.27 no.1
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    • pp.59-61
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    • 2018
  • This study made an economic evaluation of duck using Houttuynia cordata (H. cordata) powder as feed additives after 6 weeks. A total of 300 ducks (Pekins) were randomly assigned to one of the three treatments (0%, 0.5% and 1% H. cordata powder), with 5 replicates of 20 ducks each. After 6-week feeding trial, an economic improvement in all the treatments was found in following order: T2 (1% H. cordata powder) > T1 (0.5% H. cordata powder) > control. The results suggested that the addition of H. cordata powder to duck diets provided significantly greater economic benefits, indicating sustainable environmental management of the duck industry.

Economic Evaluation of Rape Cultivation using a Survey for Participants on a Pilot Project (유채재배에 대한 경제성 분석 -유채시범사업 대상지의 농가 설문자료를 이용하여-)

  • Choi, Eun-Ho;Lee, Seoung-Jung;Cho, Yong-Sung
    • Korean Journal of Organic Agriculture
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    • v.19 no.3
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    • pp.329-341
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    • 2011
  • This study empirically analyzes the economic validity of rape farmers. The analysis of economic evaluation is based on the benefit-cost analysis. Previous studies have undoubtedly expanded our understanding of the importance of substitution effects on a rapeseed for bio-fuels. However, earlier studies have mostly dealt with the concept of biodiesel's economics analysis, but this paper's attentions have been paid to the economic analysis of farm. The aim of this paper is suggesting the most appropriate policy brings about why farmhouses should cultivate the rape. To answer this question, this paper adopts a scenario analysis and the B/C ratio is used.

Economic Evaluation of BESS (Battery Energy Storage System) (전지전력저장시스템의 경제성분석)

  • Kim, Jae-Chul;Choi, Joon-Ho;Kim, Eung-Sang;Choi, Byoung-Soo;Lee, Young-Ha;Hwang, Yong-Ha
    • Proceedings of the KIEE Conference
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    • pp.1091-1093
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    • 1998
  • The BESS has a major advantages such as load leveling, quick response emergency power (spinning reserve), frequency and voltage control, improvement of reliability, and deferred generation and transmission capacity construction. However, the economic feasibility of these systems requires justification from the customer side of meter. In this paper, we proposed the economic evaluation model of BESS which is modified and complemented the SYSPLAN model[2]. In addition, we analyzed a economic evaluation from the economic measures such as payback period, overall benefit, ROI, and ROR.

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A Study on the Economic Evaluation of Photovoltaic System in the Residential Building (주거용 건물의 태양광 발전시스템 경제성 평가에 관한 연구)

  • Choi, Jeong-Min;Ju, Jai-Wook;Kim, Dong-Gyu
    • Journal of the Korean Solar Energy Society
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    • v.29 no.6
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    • pp.14-21
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    • 2009
  • The demand and installation for photovoltaic system(namely, PV) has grown steadily in Korea. However, the PV system has a various economic viability according to the PV system characteristic variables such as inverter efficiency, miscellaneous power conditioning losses, azimuth and slope of PV array, PV tracking mode, and so on. The other variables are the monthly consumed electric energy and economic related factor such as initial cost, government subsidy, maintenance cost, inflation rate, energy cost escalation rate, discount rate, etc. Therefore, this study is to present economic evaluation of PV system with those concerned factors by calculating internal rate of return, year-to-positive cash flow and net present value indices.