• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집B
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• pp.962-969
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• 2000

Quality that character of energy is the same at every state in case of equal working fluid and net concept of material flow was applied to thermoeconomics about energy system, and we could naturally explain the suitable degree about this concept, also thermoecomic equations about general power plant was easily deduced. And deduced equations exactly corresponded with principle of thermoeconomics that overall input cost flow rate equal overall output cost flow rate. This equations is applied to gas turbine cogeneration power plant as one example and found the product unit cost. Also this product cost comparison could been naturally explained.

• 에너지공학
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• 제1권1호
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• pp.87-96
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• 1992

열교환기의 설치비 및 연간 비용에 주된 영향을 미치는 유틸리티의 소비와 열 교환 장치 수의 최소화를 목적으로 하여 경험법칙을 기초로 한 열교환망 합성 방법을 제안하였다. 본 연구에서 제안하는 열교환망 합성 알고리즘의 특징은 축소된 부문제 생성 기법과 부문제의 해를 구하는 방법에 있으며, 제안한 방법을 문헌에 실린 열교환망 합성 문제에 적용한 결과 이전의 결과보다 열교환장치 및 흐름의 분기등이 감소한 결과를 얻음으로써 본 방법의 우수성을 확인할 수 있었다.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 춘계학술논문요약집
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• pp.249-250
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• 2018

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 춘계학술논문요약집
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• pp.303-304
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• 2018

• 한국수소및신에너지학회논문집
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• 제33권3호
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• pp.247-254
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• 2022

Slush hydrogen containing liquid and solid hydrogen is expected to achieve zero boil-off by suppressing boil-off gas because heat of fusion for solid absorbe the heat ingress from atmosphere. In this paper, quantitative analysis on storage cost considering specific energy consumption between 1,000 m³ class liquid hydrogen storage system with re-liquefaction and slush hydrogen storage system during equivalent zero boil off period. Even though approximately 50% of total storage capacity should be converted into solid phase during the initial cargo bunkering, total energy consumption to convert into slush hydrogen is relatively 25% less than re-liquefaction energy for boil off hydrogen during zero boil off period. That's because energy consumption of slush phase change take up only 1.8% of liquefaction energy. moreover, annual revenue requirement including CAPEX, OPEX and electric cost for slush hydrogen storage could be more reduced approximately 32.5% than those of liquid hydrogen storage and specific energy storage cost ($/kg-H₂) could also be lowered by about 41.7% compared with liquid hydrogen storage.

• KIEAE Journal
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• 제6권1호
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• pp.3-10
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• 2006

As has been expected, economic factors are a major consideration in almost every decision in building design process. Assuming that improving a lighting system, existing or proposed, will reduce operating cost, what preliminary economic guidelines can be established to determine whether any proposed investment appears cost effective? In such a case a reasonable technique to compare system costs is by life-cycle costing. Stated simply, a life-cycle cost represents the total cost of a system over its entire life cycle, that is, the sum of first cost and all future costs. This paper aims to exemplify the benefit of daylighting in term of economic consideration. Four different electric lighting system designs are proposed and a lighting control system that is continuously operating according to the level of daylight in the space has been adapted. The accumulated performance of electric and daylighting is figured out to declare the effective depth of daylight in the space. The analysis on the saving amount of lighting energy due to daylight has been undertaken in answer to the question, that is, several projects are being considered, which is the most desirable from the cost-effectiveness viewpoint. The result shows clearly that although denser layout of lighting fixtures might be more effective to interface to the level of daylight ceaselessly changeable, its economic benefit may not meet the expected criterion the reason of increased initial investment and maintenance cost for the fixtures and control hardware.

• 전기학회논문지
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• 제61권9호
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• pp.1249-1259
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• 2012

This paper proposes a Web Based Online Outage Cost Assessment and Information System(WOOCAIS) for power system outage cost assessment. The proposed WOOCAIS is a kind of web based survey method for outage cost assessment. While conventional survey methods have done outage cost assessment based on survey paper lists collected by post mail or visiting customers, the proposed WOOCAIS is a web based online survey operation and assessment system. Therefore, it can curtail expenditure for survey and also is more convenient than conventional method. It will be set up for actual outage cost assessment system of KEPCO in South Korea in the near future. The WOOCAIS will be applied in various research and actual planning and operation areas. First of all, the assessed results may be not only applied as one of objective function for generation system and grid expansion but also operational planning problems in power system.

• 전기저널
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• 6호통권54호
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• pp.2-4
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• 1981

• 전기저널
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• 8호통권56호
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• pp.2-5
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• 1981

• 전기저널
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• 7호통권55호
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• pp.3-6
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• 1981