Ref.: MmeMss23-001
Apresentador: Ivaldo Leão Ferreira
Autores (Instituição): Santos Júnior, G.M.(Universidade Federal do Pará); Marques, V.A.(Universidade Federal do Pará); Negrão, A.C.(Universidade Federal do Pará); Gonzaga, F.S.(Universidade Federal do Pará); Moreira, A.L.(Universidade Federal do Pará); Ferreira, I.L.(Universidade Federal do Pará);
Resumo:
The increasing emission of pollutants from using fossil fuels and other non-renewable energy sources concerning the environmental impacts motivates research on renewable energy. With this view, the design of the reservoirs for thermal energy storage, the phase change materials (PCM), thermophysical and phase transformation properties, numerical simulation, and energy demand fluctuations are the challenges posed to scale the design of TES properly. This work aims to design a thermal reservoir considering as PCM the alloy Al-6wt.%Cu-3wt.%Si, to supply a residential energy demand for six hours. To accomplish this, a numerical model for the transient solidification of alloys, previously applied for the solidification of multicomponent systems, will be carried out to predict solidification and melting kinetics. The choice of alloy system is based on the set of thermophysical properties and phase diagram availability. The thermal parameters and variables calculated will be used to build graphical descriptions of the transient solidification in terms of dimensionless temperature (?i), Biot number (Bi), and Fourier number (Fo). Thus, it is possible to size the reservoir by knowing the total energy demand (Et), the amount of mass of PCM needed, by Mpcm=Et/?H as well as the volume occupied by it distributed in a geometry of plates of a certain thickness which will exchange heat with the external fluid. The obtained results showed that a suitable thickness associated with a heat transfer coefficient (hi) of the external medium will be sufficient to supply the total energy in the predefined time and with the temperatures predicted by the abacuses.