4 documents found, page 1 of 1
Optimization of a thermal energy storage system provided with an adsorption mod...
Fernandes, M. S.; Gaspar, A. R.; Costa, V. A. F.; Costa, J. J.; Brites, G. J. V. N.The optimization and assessment study of a thermal energy adsorption storage system is presented. The system integrates an adsorption heat storage module in a conventional hot water storage tank of a solar thermal system, operating with the silica-gel/water adsorption pair. The system was modeled using TRNSYS® and MATLAB®, and was previously assessed and improved through a set of parametric tests for each main ...
Numerical model for the prediction of dilute, three-dimensional, turbulent flui...
Oliveira, L. A.; Costa, V. A. F.; Baliga, B. R.A numerical model for dilute, three-dimensional, turbulent, incompressible fluid-solid particle flows and its application to a demonstration problem are presented. An Eulerian description is used to model the flow of the fluid (carrier) phase, and the governing equations are solved using a control-volume finite element method (CVFEM). The motion of the solid (particulate) phase is simulated using a Lagrangian a...
Modeling and simulation of wetted porous thermal barriers operating under high ...
Costa, V. A. F.; Mendonça, M. L.; Figueiredo, A. R.Porous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer i...
A Lagrangian-Eulerian model of particle dispersion in a turbulent plane mixing ...
Oliveira, L. A.; Costa, V. A. F.; Baliga, B. R.A Lagrangian-Eulerian model for the dispersion of solid particles in a two-dimensional, incompressible, turbulent flow is reported and validated. Prediction of the continuous phase is done by solving an Eulerian model using a control-volume finite element method (CVFEM). A Lagrangian model is also applied, using a Runge-Kutta method to obtain the particle trajectories. The effect of fluid turbulence upon partic...