N2 - In recent years, we can observe the development of the thermal diagnosis and operating control systems based on measuring techniques and mathematical modelling of processes improvement. Evaluation of the actual operating state is insufficient to make an optimal operating decisions. Thus, information about the influence of the operating parameters' deviations from the reference state on indicators describing energy consumption of the process (for example specific heat consumption or specific energy consumption) is also necessary. The paper presents methods for generation the information about the influence of the steam-water cycle operating parameters on specific heat consumption in a turbine's cycle. A mathematical model of steam-water cycle for a CHP (Cogeneration - also Combined Heat and Power) unit is being worked out. Methods for calculation of operating deviations with the application of correction curves and a mathematical model are described. Exemplary calculation results are presented. L1 - http://www.czasopisma.pan.pl/Content/94292/PDF/08_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/94292 PY - 2011 IS - No 4 December EP - 107 DO - 10.2478/v10173-011-0035-z KW - mathematical model KW - CHP unit KW - Steam-water cycle KW - Bleed-condensing turbine KW - Correction curves KW - Deviations of specific heat consumption A1 - Rusinowski, Henryk A1 - Szapajko, Grzegorz PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2011 T1 - Energy evaluation of steam-water cycle operation with mathematical modelling application SP - 101 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/94292 T2 - Archives of Thermodynamics