• 제목/요약/키워드: Economic evaluation

검색결과 529건 처리시간 0.134초

냉방열원기기의 경제성 평가를 위한 간이계산법의 적용성 검토 (Validating the Applicability of a Simplified Correlation Method for Economic Evaluation of Cooling Plants)

  • 김영섭;김강수
    • 설비공학논문집
    • /
    • v.14 no.10
    • /
    • pp.854-862
    • /
    • 2002
  • In the previous research, a simplified correlation method was developed as an easy prediction tool for comparing energy use of cooling plants. The purpose of this paper is to test the applicability of this method for economic evaluation with two zones of a 20-story commercial building in Seoul. The results of this method were compared with the DOE-2 simulation and actual measured data. Then, Comparisons of life cycle cost were carried out for three types of cooling plants. Testing of one zone showed good agreement of within 10% error in cooling energy use and within 2% error in LCC. But testing of the other zone indicated that the use of this method were invalid when input variables were used beyond its valid range.

해상풍력발전단지 간의 전력계통 연계에 관한 경제성 분석 연구 (Economic Evaluation of Power Grid Interconnection between Offshore Wind Power Plants)

  • 문원식;조아라;김재철
    • 전기학회논문지P
    • /
    • v.63 no.4
    • /
    • pp.339-344
    • /
    • 2014
  • An offshore wind power plant (WPP) is very expensive and different from an onshore wind power system in many ways. There has been a continuous increase in the capacity of the offshore WPPs. Therefore it is essential to analyze the feasibility and reliability of the offshore wind power to optimize their redundancy. Besides, it is very important to study a planning for grid interconnection of adjacent offshore WPPs. This paper proposes a economic evaluation method to interconnect with adjacent offshore substations in offshore wind power grid. Also, we suggest the probabilistic reliability method to calculate a probabilistic power output of the wind turbine and a cost of the expected energy not supplied that is used as the reliability index of the power system.

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

  • 김재철;최준호;김응상;최병수;이영하;황용하
    • 대한전기학회:학술대회논문집
    • /
    • /
    • pp.1091-1093
    • /
    • 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.

  • PDF

단열 리모델링 공사의 경제성 평가에 관한 연구 (A Study on the Economic Evaluation of Thermal Insulation Remodeling)

  • 김세범;전민창;이상범;김대영
    • 한국건축시공학회:학술대회논문집
    • /
    • /
    • pp.142-143
    • /
    • 2015
  • In this study, the remodeling of the insulation for the study of economic evaluation to find out. Targeting first Hyomin Domitory in Dong-Eui University, the purpose of the study is to carry out insulation work to conform to the strengthening of legal insulation standards. Studies in the way of insulation construction surveys of students who after living through the Survey. Exterior walls and windows with a comparative analysis of the thermal transmittance insulation performance is calculated according to the annual heating costs. The study is about 108 years after the investment is recovered through the break-even point was to know. Resolve residents' complaints, the gap wind reduction, reduction of environmental pollution and other problems solved.

  • PDF

자립형 철골 접합부를 이용한 철골설치 방식의 경제성 평가에 관한 연구 (A Study on Economic Evaluation Method of Steel Erection Work using by Self-supported Steel Joint)

  • 김창기;김태훈;조훈희;강경인
    • 한국건축시공학회:학술대회논문집
    • /
    • /
    • pp.3-7
    • /
    • 2009
  • Construction projects are being the skyscraper and the large size by limited site condition and developing construction technology. Therefore, Steel structure work is steadily increasing caused by easy to work and structural safety. However, steel-frame work has the large incidence of heavy accident potentially. Recently a research group has recently developed newly designed self-supported steel joint for enhancing safety of steel erection work. Before applying the steel joint in a construction site, economic evaluation should be performed. Thus, we proposed the method for measuring economic efficiency of the new steel joint and verified economic feasibility of the steel joint method through a case study. As a result, Steel erection method using by self-supported steel joint showed economic rather than the one using by H-beams.

  • PDF

A Comparative Analysis of Evaluation Methodologies for Railway Investments of China and Korea

  • Sun Sunduck D.
    • 대한교통학회:학술대회논문집
    • /
    • /
    • pp.65-70
    • /
    • 1998
  • Economic evaluation methodologies for railway investments of China and Korea are comparatively analyzed. Chinese procedures specified in the new economic evaluation manual of 1997 were compared with those of Korea based on the economic evaluation manual of 1982. As expected those procedures reflect general economic requirements of the respective countries. Several differences in the specification are also noted. Details of the specification of Chinese procedure far exceed Korean specification, while Korean manual is rich of explanation on the fundamental theory. Differences in the procedure of calculating benefits of investments are most conspicuous, and specific requirements of carrying out a optimum opening year analysis in Korean procedure is notable. Despite of these differences in the procedure, two methodologies share same objective of ensuring selection of economically and financially sound railway projects. Both procedures of China and Korea, however, limit their evaluation scope on railways alone. Therefore, they are needed to expand scope of evaluation to encompass the idea of multi-modal or inter-modal evaluation, which will eventually contribute to build truly efficient national comprehensive transportation system.

  • PDF

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

  • 최은호;이승정;조용성
    • 한국유기농업학회지
    • /
    • v.19 no.3
    • /
    • pp.329-341
    • /
    • 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.

강섬유보강숏크리트의 역학적 특성 및 경제성 평가 (Mechanical Properties and Economic Evaluation of Steel Fiber Reinforced Shotcrete)

  • 손영현;박우진
    • 한국안전학회지
    • /
    • v.13 no.2
    • /
    • pp.122-129
    • /
    • 1998
  • A field experiment was performed to analyze the properties of SFRS(steel fiber reinforced shotcrete) against WMRS(wire mesh reinforced shotcrete) with some experimental parameters. The parameters were reinforcing methods(steel fiber and wire mesh), steel fiber contents(0.5%, 0.75%, and 1.0%), silica fume contents(0.0% and 10.0%), spraying thicknesses of layer(10㎝, 8㎝, and 6㎝), and spraying parts(side wall, shoulder, and crown). According to the analyzed results, the mechanical properties of SFRS such as compressive strength, flexural strength, and load-carrying capacity after cracks were improved. And the economic evaluation was also performed on the basis of the required thickness of the layer and other researcher's results for rebound ratios. From the results of this tests, it is found that the traditional WMRS may be substituted by the SFRS in the viewpoint of the economic evaluation as well as the mechanical properties. In additions, the silica fume, even if it is very expensive, can significantly improve the mechanical properties of the shotcrete regardless of mixing with or without the steel fiber.

  • PDF

생산시스템의 설치에 따른 비용분석 및 경제성평가 (Cost Analysis and Economic Evaluation for Manufacturing System Installation)

  • 최형호
    • 산업경영시스템학회지
    • /
    • v.18 no.34
    • /
    • pp.161-172
    • /
    • 1995
  • The paper examines the cost analysis and economic evaluation for manufacturing system installation in a metal industry. The evaluation procedure is consist of four steps. 1) Attribute determination of manufacturing system 2) Cost Estimating 3) Alternative and Model determination of manufacturing system 4) Economic Analysis. The impact of manufacturing system installations on employment displacement and strategic benefit is discussed and suggested to make a coherent determination of company's objective.

  • PDF

경제성 평가에 의한 군함의 초기설계에 관한 연구 (A Study on Preliminary Design of Warships by Economic Evaluation)

  • 신수철
    • 대한조선학회논문집
    • /
    • v.45 no.2
    • /
    • pp.221-228
    • /
    • 2008
  • This paper describes to determine optimum main particulars of warships which satisfy user's requirements in a concept design stage with minimum construction cost and maximum transportation efficiency. Present worth was used as an assessment criteria of the economical efficiency. And Pareto optimal set was used to have the optimum design.