Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Mathematical model of a heat exchanger operating with emissions from a thermal treatment of municipal solid waste
Submission Author:
Matias Nicolas Muñoz , PR , Argentina
Co-Authors:
Matias Nicolas Muñoz, JOSÉ VIRIATO COELHO VARGAS, Wellington Balmant
Presenter: Matias Nicolas Muñoz
doi://10.26678/ABCM.COBEM2017.COB17-0836
Abstract
In this work, we consider the basic thermodynamic problem of extracting the greatest amount of energy from a hot exhaust flow. The objective is thermodynamical to optimize the system, locating the optimal capacity rate and the out temperature of the cold stream. Thus, a non-dimensional mathematical model of a heat exchanger is presented in steady state with phase changes of the cold current. For the model, we use the basic principle of classical thermodynamics and the concept of heat transfer, obtaining nonlinear equations to be constructed by computer code. The temperature entering the water, considered for this analysis, corresponds to T1=334 K enters as condensate and boils at Tb=444 K. The pressure that is exposed to the current of water is 8 bar. However, the inlet temperature of the hot gas is TH=1,072 K. We have found that the optimal capacity rate of the cold current is Mopt=0.18. If M varies the temperature distributions changes and the second law, efficiency exhibits a maximum at value Mopt. It means that any stream can be matched optimally, such that most of the exergy carried by the hot stream is captured by the cold stream
Keywords
mathematical modelling, thermodynamic optimization, urban solid waste, Heat exchanger
