Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
A magnetocaloric rotary refrigerator processes simulator using a stepwise modelling approach
Submission Author:
Victória Heringer Saippa , RJ , Brazil
Co-Authors:
Victória Heringer Saippa, Julio Tedesco, L. Diógenes T. Câmara
Presenter: Victória Heringer Saippa
doi://10.26678/ABCM.COBEM2021.COB2021-2132
Abstract
Magnetic refrigeration has been seeing as a promising technology. Based on the magnetocaloric effect, one of its great advantages is it offers smaller global environmental impact when comparing to the conventional refrigeration. Simulations of the thermodynamics processes, beyond their modeling, can provide important information in the development and optimization of the experimental devices. There are many designs of these systems. One of the most useful and used is the rotary refrigerators, which presents several challenges in terms of complexity when comparing to reciprocating ones. However, these challenges are compensated by several of its properties. A full process simulator able to assess the thermal response and mapping some thermal properties of magnetocaloric refrigerator processes was implemented in order to study the processes performance over different conditions. A stepwise modeling approach was applied, simplifying the phenomena of heat transfers. Some magnetocaloric materials were chosen as refrigerant material. Among these materials are Gd metal and Gd5Ge2Si2 alloy, which present magnetic transition near to room temperature. The routine consider a rotating clockwise magnetic material wheel with an anticlockwise closed flow loop of water, which percolates the six magnetocaloric material porous beds, hot and cold heat exchanger. The simulator was able to represent the transient aspects as well as the steady state conditions of the processes, considering both time performance and numerical stability. The inversion in heat transfer profiles along the process was used as a limit in the calculation of the maximum heat transfer absorption in the cold exchanger.
Keywords
magnetic refrigeration, magnetocaloric effect, rotary refrigerator, stepwise modelling, transient magnetic regenerative process
