N2 - Secure and cost-effective power generation has become very important nowdays. Care must be taken while designing and operating modern steam power plants. There are regulations such as German boiler regulations (Technische Regeln für Dampfkessel 301) or European Standards that guide the user how to operate the steam power plants. However, those regulations are based on the quasi-steady state assumption and one dimensional temperature distribution in the entire element. This simplifications may not guarantee that the heating and cooling operations are conducted in the most efficient way. Thus, it was important to find an improved method that can allow to establish optimum parameters for heating and cooling operations. The optimum parameters should guarantee that the maximum total stresses in the construction element are in the allowable limits and the entire process is conducted in the shortest time. This paper summarizes mathematical descriptions how to optimize shut down process of power block devices. The optimization formulation is based on the assumption that the maximum total stresses in the whole construction element should be kept within allowable limits during cooling operation. Additionally, the operation should be processed in the shortest time possible. L1 - http://www.journals.pan.pl/Content/94289/PDF/07_paper.pdf L2 - http://www.journals.pan.pl/Content/94289 PY - 2011 IS - No 4 December EP - 99 DO - 10.2478/v10173-011-0034-0 KW - heat transfer KW - thermal stresses KW - Optimization KW - Power plant A1 - Rząsa, Dariusz A1 - Duda, Piotr 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 - Numerical method for determining the allowable medium temperature during transient operation of a thick-walled boiler element in power plant SP - 91 UR - http://www.journals.pan.pl/dlibra/publication/edition/94289 T2 - Archives of Thermodynamics