The relevance of the project is the enhancement of the thermal conductivity of an O-PCM through the addition of nanoparticles and the implementation of this composite in thermal envelopes to be applied in buildings and houses. 5) To design and construct an experimental set-up with an O-PCM based thermal envelope to the better understanding of the process and the validation of the numerical codes and 4) To improve the existing home-made numerical codes based on the Control Volume Finite-Element Method (CVFEM) and the Finite Volume Method (FVM) through the implementation of parallelization strategies (MPI, OpenACC), novel coupling algorithms (PSIMPLER, CUT) and multigrid solver techniques. 3) Numerically simulate by computational tools based on the finite volume method the process of charging/discharging of the O-PCMs in three-dimensional domains (cylinder model, shell and tube model and conjugate model indoor application).
2) Characterize the thermophysical and rheological behavior of the O-PCM composite as a function of the temperature and concentration of nanoparticles. The main goals are: 1) to synthesize a chemically stable nanoparticle based composite to be used as an O-PCMs in thermal energy envelopes. Properties will be described by suitable constitutive equations which will be implemented in mathematical models of different latent heat thermal storage systems The thermophysical and rheological properties of the O-PCM and the composite will be measured as a function of the temperature and nanoparticles concentration. The project includes both experimental and numerical developments. The composite will be implemented on energy storage in thermal envelopes. The main issue of this project is the synthesis and implementation of a chemically stable nanoparticle based organic phase change material (O-PCM). This proposal focuses mainly on storage of energy by using phase change materials (PCM) with improved thermal properties, which leads to the modification of thermal envelopes to save energy to the Chilean inhabitants and to improve their quality of living. Without loss of generality, the same operator theoretical approach applies to the eigenvalue problems of the coupled vibration problem in a more general three-dimensional acoustic region with a plate for a part of its boundary. The results are given for a two-dimensional coupled problem. We confirm the adequacy of this perturbation analysis by investigating some numerical examples. In some practical applications, by using this perturbation series, it would become unnecessary to perform time consuming computations to get coupled eigenvalues, and hence the present results obtained by the perturbation analysis might have considerable engineering importance.
#Mdf acoustica series#
We prove that the series consists only of even order terms of ε.
We represent an eigenpair for the coupled system by a perturbation series with respect to ε which enable us to express the eigenpair for the coupled case by those for the decoupled case.
A natural interpretation of this parameter is given. Furthermore, we introduce a coupling strength parameter ε as a multiplier applied to the nondiagonal coupling terms. The problem leads to a nonstandard eigenvalue problem in a function space. A typical example of the structure is a car body that can be modeled by a cluster of thin plates. We formulate a coupled vibration problem between a structure and an acoustic field in a mathematically rigorous fashion.
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