• 제목/요약/키워드: Economic evaluation

검색결과 534건 처리시간 0.124초

하천수 이용 열원시스템의 경제성 평가 (Economic Evaluation on Energy System Using River Water)

  • 이철구;김종대;임태순;최명식;방승기;함흥돈
    • 한국지열·수열에너지학회논문집
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    • v.9 no.2
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    • pp.25-31
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    • 2013
  • It has become very important for unused energy to be used for building air conditioning. Economic evaluation on energy system by using river water as a heat source, which is one of the unused energy, was carried out. The floor area of the building and the distance between heat source equipment and river was assumed $50,000m^2$ and 200 m. General heat source system using absorption chiller-heater was used for comparing to the energy saving system, and payback period method using initial cost and running cost of two systems, was used to perform economic evaluation. According to development of high capacity of water source heat pump which is appropriate for using river water, initial cost for the system has been reduced. Payback period was about 3.2 years, and this period might be shortened if nation's economic support enact.

지열히트펌프와 지역냉난방 시스템의 운영사례를 중심으로 경제성 비교분석 연구 (A Study of Comparative Economic Evaluation for the System of Ground Source Heat Pump and District Heating and Cooling:Focusing on the Analysis of Operation Case)

  • 이기창;홍준희;공형진
    • 설비공학논문집
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    • v.28 no.3
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    • pp.103-109
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    • 2016
  • The purpose of this study is to perform comparative economic evaluation for the systems of ground source heat pump (GSHP) and district heating and cooling (DHC) by focusing on the analysis of operation case of GSHP. The adapted research object is a public office building located in Seoul. The capacity of ground source pump is about 3,900 kW. Ground heat exchanger is closed loop type. The analysis period for life cycle cost is 30 years. Economic evaluation is assessed from the viewpoints of the following four parts: initial cost, energy cost, maintenance and replacement cost, and environment cost. The total life cycle cost of GSHP is approximately 8,447 million won. The cost of the DHC System is approximately 3,793 million won. The cost of the DHC is approximately 46% lower than GSHP system under the condition of current rate for GSHP and DHC.

하수처리수 이용 열원시스템의 경제성 평가 (Economic Evaluation on Energy System Using Treated Sewage Water)

  • 이철구
    • 한국지열·수열에너지학회논문집
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    • v.13 no.3
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    • pp.16-22
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    • 2017
  • It has become important for unutilized energy to be used for air conditioning of building. Economic evaluation on energy system by using treated sewage water as heat source, which is one of unutilized energy, was performed. The floor area of the subject building and the distance between heat source equipment and sewage treatment plant was assumed $30,000m^2$ and 200m. Absorption chiller-heater system was used for comparing to the energy efficient system, and payback period method was applied to carry out economic evaluation. Although the operating cost of this system is reduced compared to general heat source system, the ratio is not meaningful compared to the initial investment cost increase, and payback period was calculated to be about 36.1 years. However, when calculated based on the 2014 rate of electricity and city gas, it will be greatly reduced to 3.1 years. International commodity prices are constantly changing, and therefore national policy on the spread of unutilized energy should be maintained.

가중평균자본비용을 이용한 투자 안의 경제성평가에 관한 연구 (A Study on the Economics Evaluation using Weighted Average Cost of Capital)

  • 김태성;구일섭
    • 대한안전경영과학회지
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    • v.3 no.4
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    • pp.135-144
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    • 2001
  • The capital cost of the company is one that must be paid to the money owner as the price by using the money. The capital cost according to the source of money supply can be estimated by the expected profit rate undertaken by the use of the capital. But in the area of pre-existent economic evaluation, the evaluation of the company investment has been treated by the profit rate of the capital after considering the repayment conditions of the other's money or the interest. Thus in this study, in case the company makes an investment on various kinds of the capital at the same time, not make use of the capital as a one source, the economic evaluation of an investment should be handled by taking the weighted average cost of capital into consideration in proportion to the constitution of the capital cost by the sources of money supply, Especially, as the cost of the private money is very much connected with the profit rate through the stock market, the Capital Asset Pricing Model (CAPM) will be applied. This kind of economic evaluation method can be said to have much to do with the Economic Value Added : EVA) as well as to be highly thought as a standard to estimate the company' value recently To certify the usefulness of this approach, the case study of the output of the capital cost will be made for the purse of the economic evaluation of the alternative investment by using the financial statements of a motor company H.

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Engineering and Economic Evaluation of Production of MgO Nanoparticles using a Physicochemical Method

  • Priatna, Deri;Nandiyanto, Asep Bayu Dani
    • International journal of advanced smart convergence
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    • v.8 no.4
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    • pp.26-33
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    • 2019
  • We conducted research to evaluate economically and engineering about the synthesis of Magnesium Oxide, MgO, nanoparticles using physicochemical methods. The method used was economic evaluation by calculating GPM, BEP, PBP, and CNPV. The other method used was engineering perspective. MgO nanoparticles were synthesized by reacting Mg(NO3)2 and NaOH with a mole ratio 1: 2. Mg(OH)2 formed was heated and calcined to remove water content and to oxidation to form MgO. An economic evaluation by calculating GPM and CNPV for the production of MgO nanoparticles on an industrial scale shows that the payback period (PBP) occur in the third year and profits increase each year. Tax variations show that the higher of tax, the lower profits received. When there was an increase of selling prices, the profit was greater. The variable cost used is the price of raw material. When there was an increased in the variable cost price, the payback period was longer and the profits was reduced. The benefit of this research is knowing the industrial production of MgO nanoparticles is beneficial. The function of MgO nanoparticles is a material for the manufacture of ceramics and can be used as an antimicrobial in the water filtration process.

전력회사와 발전사업자 측면에서 도서지역용 마이크로그리드의 경제성평가 알고리즘 (Economic Evaluation Algorithm of Island Micro-grid for Utility and Independent Power Producer)

  • 남양현;이후동;김유림;마리토;김미영;노대석
    • 전기학회논문지
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    • v.66 no.7
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    • pp.1032-1038
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    • 2017
  • Recently, regulation on carbon emissions has been strengthened according to the new climate change convention (COP21) held in Paris, and then Korea has decided to reduce CO2 emissions by 37% until 2030. As one of countermeasures, the government has energetically performed demonstration projects of island micro-grid including solar power, wind power and energy storage system. However, in order to smoothly introduce island micro-grid, it is a critical issue to carry out the economic evaluation for power utility aspect and independent power producer aspect. Therefore, this paper proposes economic evaluation algorithms of island micro-grid which are based on the present worth method, considering cost and benefit factors in the aspect of both sides. Firstly, in case of power utility this paper proposes algorithm to estimate a period of return on investment according to the introduction capacity of distributed generators replacing diesel generator. And also, in case of independent power producer, this paper proposes evaluation algorithm to estimate weighting factor of SMP and benefit rate based on break-even point related with cost and benefit. From a case study result on real island micro-grid model, it is confirmed that proposed algorithms are useful and practical for the economic evaluation of island micro-grid.

인도네시아 소규모 KSO 광구의 경제성 평가 연구 (A Study on Economic Evaluation of Small KSO Field in Indonesia)

  • 문서윤;최영일;임종세;허승균;정광석
    • 한국자원공학회지
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    • v.55 no.6
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    • pp.624-634
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    • 2018
  • 인도네시아는 신규 유전 발견이 줄어들고 원유 순수입국으로 전환됨에 따라 석유 생산을 늘리고자 공동개발계약(Kerja Sama Operasi, KSO)을 통해 소규모 광구 개발을 위한 국내 투자 유치 활성화에 노력하고 있다. 하지만 KSO는 계약자 고위험 저수익의 계약형태이며, 계약자가 석유개발에 대한 모든 비용을 지불하기에 사업 타당성 판단을 위한 경제성 평가가 필수적이다. 이 연구에서는 KSO 계약 조건을 적용하여 인도네시아 소규모 광구 개발에 대한 경제성 평가를 수행하였으며, 민감도 분석을 통해 경제성 평가 시 주요 변수를 파악하였다. 그 결과 유가, CAPEX, OPEX가 경제성 평가에 영향을 미치는 것으로 나타났으며, 소규모 광구에서 상업적인 생산은 다소 어려운 것으로 판단되었다. 향후 이 연구는 국내 기업이 인도네시아 자원개발 투자 시 참고 자료로 활용할 수 있을 것이다.

신재생에너지 발전 출력 예측과 경제성 종합평가 기술개발 (Development of Economic Evaluation Solution and Power Prediction of Renewable Energy System)

  • 전대성;김진영;김현구;김종현;염기웅;신기열
    • 한국태양에너지학회 논문집
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    • v.39 no.6
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    • pp.93-112
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    • 2019
  • In this paper, a very new web-based software for renewable energy system (RES) design and economic evaluation was introduced. This solution would provide the precise RES estimation service including not only photovoltaic (PV), wind turbine (WT) and fuel cell (FC) individually but also energy storage system (ESS) as combined forms with PV or WT. The three reasons why we ought to develop it are: First, the standardized tool suitable to the domestic environment for estimating power generation from RES facilities and economic evaluation is required. Secondly, the standardized tool is needed to spread domestic RES supply policy and to promote the new industry in the micro-grid field. The last, the reliability of economic evaluation should be enhanced more for new facilities. To achieve those aims, the weather database of one hundred locations have established and the RES facility database has also constructed. For the energy management, mathematical models for PV, WT, ESS and FC were developed. As a final phase, the analytical process to evaluate economics has performed with field data verification.

Process design and techno-economic evaluation for catalytic production of cellulosic γ-Valerolactone using lignin derived propyl guaiacol

  • Han, Jeehoon
    • Journal of Industrial and Engineering Chemistry
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    • v.52
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    • pp.218-223
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    • 2017
  • This paper presents an integrated strategy to produce cellulosic ${\gamma}$-Valerolactone (GVL) using lignin derived propyl guaiacol (PG) from lignocellulosic biomass. A commercially large-scale process that was designed based on the strategy achieves 12.3% carbon yields at low (9.1-30.0 wt%) concentrations of reactants, and requires an efficient separation system to obtain high recovery of products with low energy requirements. A heat exchanger network is designed to significantly decrease the total energy requirements of the process. Techno-economic evaluation results assuming nth commercial plant and negative economic parameters show that this process ($US 3,805/t GVL) can be cost-competitive with current production approaches.

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

  • 김세범;전민창;이상범;김대영
    • 한국건축시공학회:학술대회논문집
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    • pp.142-143
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    • 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.

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