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Application of exergy analysis for evaluation of CO2emission from operation of steam power unitSzargut proposed the algorithm for determination of the influence of irreversibility of components of thermal process on the emission of CO2[6]. In the presented paper, basing on Szargut's proposal, the example of analysis of influence of operational parameters of coal fired power plant on the local increase of CO2emission is presented. The influence of operational parameters on the local exergy losses appearing in components of investigated power plant are simulating making use of the semi-empirical model of power plant.

The paper is devoted to the problems of exergetic cost determination. A brief description of theoretical fundamentals of exergetic cost determination and its application are presented. The applied method of calculations is based on the rules of determination of cumulative exergy consumption. The additional possibilities ensured by the exergetic cost analysis in comparison to the direct exergy consumption analysis are discussed. The presented methodology was applied for the analysis of influence of operational parameters on exergetic cost indices of steam power plant. Results of calculations concern one of the modern Polish power plant unit. Basing on the obtained results several conclusions have been formulated that show advantages of application of exergetic cost analyses. Nomenclature A-incidence matrix B * -cumulative exergy vector aij -coefficient of consumption of i-th resource of considered j-th process b -specific exergy, kJ/kg b * j , b * i -specific cumulative exergy consumption burdening the production of j-th and i-th element of considered system, kJ/kġ B -exergy flow, kẆ B * -cumulative exergy flow, kW k * j -cumulative exergy cost of j-th component

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