Application of symbolic exergoeconomics to thermal system simulation

Abstract:

The symbolic exergoeconomic methodology (Valero, Torres 1988) obtains algebraic formulae for the efficiency and cost of thermal systems as a function of the efficiency of the subsystems, the exergy bifurcation ratios and the resources entering the plant. The object of this paper is to find under what conditions a simulator derived from the symbolic exergoeconomic procedure can replace a conventional one. For this purpose the formulation is applied to a 350 MW steam power plant unit, using symbolic computation techniques. Its results are compared with those obtained from a conventional exergy simulator. When the system's behavior comes near to fulfilling the hypotheses of 'independence' of the subsystems and 'stability' of the bifurcations, the results obtained with the two procedures are very close, and nearly coincide with a 'Taylor series approximation' procedure, as explained in the paper. Since the computational workload involved in the proposed method is significantly lower than in others, it could be an alternative way for building simulators of thermal systems.

Año de publicación:

1989

Keywords:

Fuente:

scopus