A new numerical scheme for the simulation of active magnetic regenerators

Autores UPV
Año
CONGRESO A new numerical scheme for the simulation of active magnetic regenerators

Abstract

1D models of parallel-plate active magnetic regenerators (AMR) offer a good compromise between accuracy and computation time (Engelbrecht 2008). However, to the knowledge of the authors, the suitability of the different numerical techniques for the AMR problem has not been analysed yet in depth. Moreover, in 1D models literature different correlations are employed to calculate the heat transfer in the regenerator bed (Engelbrecht 2008, Risser et al. 2010, Vuarnoz and Kawanami 2013). A new numerical scheme based on a combination of explicit and implicit techniques has been developed after carefully analysing the AMR 1D energy balances. While the widely used implicit scheme needs a very fine time grid to obtain accurate results (Engelbrecht 2008), the new scheme allows the use of a timestep as large as CFL=1. Therefore, the computational time decreases substantially. In this paper, a new 1D model for the simulation of parallel-plate AMRs is presented. The results of the new numerical scheme developed are compared to those of the implicit scheme (Engelbrecht 2008) in terms of accuracy and computation time. Finally, the new model is used to check which boundary condition of heat transfer in the regenerator bed is more appropriate between constant wall temperature and constant heat flux.