An Analytical Procedure for the Assessment of Malfunctions in Thermomechanical Systems

Authors : Javier ROYO, Antonio VALERO, Alejandro ZALETA-AGUİLAR

Pages : 31-43

View : 10 | Download : 6

Publication Date : 1998-06-01

Article Type : Research Paper

Abstract :The behaviour of the thermal components is commonly described through a set of internal parameters: isentropic efficiencies, pressure ratios, effectiveness factors, pressure losses, temperature relations or differences, et cetera. In this paper a new type of internal parameters, the internal parameters θ insert ignore into journalissuearticles values(Royo 1994, Royo and Valero 1995); are defined, that are specially adequate for the characterisation of thermal systems in an analytical way. When a component of a thermal plant displays an internal deterioration insert ignore into journalissuearticles values(intrinsic malfunction); its performance gets worse. This fact is reflected in a variation of the internal parameters describing its behaviour. On the other hand, the remaining components of the plant may be affected insert ignore into journalissuearticles values(induced malfunction); because they are working under different operating conditions from the usual ones. Knowledge of variations of the internal parameters in each component of a thermal plant does not suffice to determine their performance state under these new conditions. Additional information is needed. The dissipation temperature parameter can supply it insert ignore into journalissuearticles values(Royo 1994, Royo et al. 1997); as is explained in this paper. Internal θ parameters and the dissipation temperature parameters are appropriate tools for the study analysis and evaluation of malfunctions in thermomechanical systems. Three examples of this are shown, trying to quantify the influence of an intrinsic malfunction on the whole plant. This paper shows a strickingly new and simple vision of the analysis of thermal systems.
Keywords : energy systems analysis, malfunctions, second law analysis, intemal parameters