Electricity Production Cost Analysis of a Combined Cycle Power Plant
ABSTRACT In this study, thermoeconomic analysis of a combined cycle power plant (CCPP) is investigated. The aim of this study is to find the minimum electricity production cost (EPC). The variable parameters selected for the optimization are the compressor pressure ratio, turbine inlet temperature, isentropic efficiencies, discount rate, etc. In the analysis, all thermodynamic and thermoeconomic expressions are formulated as a function of these decision variables. Consequently, the developed model is solved and the conditions giving minimum unit EPC for each value of variable parameters are determined.
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ABSTRACT: This study presents a thermoeconomic analysis methodology to calculate unit energy (electricity and heat) production cost for a combined cycle system with steam extraction (cogeneration system). The aim of this methodology is to find the minimum energy production cost. Therefore, firstly, minimum electricity production cost is found by using annual levelized cost method for a combined cycle system which only produces electricity. Secondly, minimum heat production cost for a combined cycle system with steam extraction is calculated. Extracted steam causes the power loss in the steam turbine and reduces the income. So, heat energy production cost can be correctly determined. In the model, the fall of the income associated with the power loss is accepted as equal to heat energy cost, and heat energy production cost is formulated as a function of electricity energy production cost. Finally, the effect of different parameters like compressor pressure ratio and steam pressure on heat production cost is investigated. As a result, the outcomes of this study can provide a basis used for determination of the unit energy production costs for different energy production systems.Advances in Mechanical Engineering 02/2014; 2014:1-8. DOI:10.1155/2014/794561 · 0.58 Impact Factor
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ABSTRACT: While pulsatile ventricular assist devices have gained widespread use in adult patients awaiting heart transplantation, only very limited experience with these devices exists in the pediatric population. In the past mostly non-pulsatile systems such as ECMO have been used to support pediatric patients with heart failure for very limited periods of time. Only recently have miniaturized pulsatile devices became available. This article describes the technical characteristics of these devices which have been implanted at the Deutsches Herzzentrum Berlin since 1992. The Berlin Heart assist device has since been used in 34 children between the ages of 6 days and 16 years. We report our strategy in patient selection, perioperative care and subsequent heart transplantation. The current literature on mechanical circulatory support in children is reviewed. Copyright 1999 by W.B. Saunders CompanyPediatric Cardiac Surgery Annual of the Seminars in Thoracic and Cardiovascular Surgery 02/1999; 2:157-176. DOI:10.1016/S1092-9126(99)70017-7
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ABSTRACT: A promising renewable energy technology is electricity generated with biomass-derived synthetic gas (syngas). The economic feasibility of using biomass gasification for generating electrical power is very much dependent on the cost of the power plant and the cost of its operation. A cost model was developed to analyze the Unit Cost (unit-cost) of electricity generation from micro-scale power facilities that used biomass gasification as its energy input. The costs considered in the model were capital cost and operating costs. The results from the modeling indicated that operating cost was a major part of the total annual production cost of electricity generation, and that labor was the largest part of the total annual production cost of operation, and it was during the time when the power facilities operated at lower generation capacity levels. One effective way of reducing the unit-cost was to operate the facility at high capacity level. The study found that when the capacity level increased the total of annual cost was also increased, but the electricity unit-cost decreased markedly. For a given level of generating capacity, the electricity unit-cost of the facility operating at a two or three shifts operating mode was significantly lower than that of one shift operating mode. Copyright © 2010 John Wiley & Sons, Ltd.International Journal of Energy Research 07/2010; 35(11):989 - 1003. DOI:10.1002/er.1749 · 2.42 Impact Factor