SciELO - Scientific Electronic Library Online

 
vol.89 issue1  suppl.Maize dry matter production and macronutrient extraction model as a new approach for fertilizer rate estimationEffect of drying method on mechanical, thermal and water absorption properties of enzymatically crosslinked gelatin hydrogels author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

TREVIZOLI, PAULO V.  and  BARBOSA JR, JADER R.. Entropy Generation Minimization Analysis of Active Magnetic Regenerators. An. Acad. Bras. Ciênc. [online]. 2017, vol.89, n.1, suppl., pp.717-743. ISSN 0001-3765.  https://doi.org/10.1590/0001-3765201720160427.

A performance assessment of active magnetocaloric regenerators using entropy generation minimization is presented. The model consists of the Brinkman-Forchheimer equation to describe the fluid flow and coupled energy equations for the fluid and solid phases. Entropy generation contributions due to axial heat conduction, fluid friction and interstitial heat transfer are considered. Based on the velocity and temperature profiles, local rates of entropy generation per unit volume were integrated to give the cycle-average entropy generation in the regenerator, which is the objective function of the optimization procedure. The solid matrix is a bed of gadolinium spherical particles and the working fluid is water. Performance evaluation criteria of fixed cross-section (face) area (FA) and variable geometry (VG) are incorporated into the optimization procedure to identify the most appropriate parameters and operating conditions under fixed constraints of specified temperature span and cooling capacity.

Keywords : Active Magnetic Regenerator (AMR); magnetic refrigeration; Performance Evaluation Criteria (PEC); entropy generation minimization.

        · text in English     · English ( pdf )