Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Performance of a magnetic refrigerator operating with finite thermal conductance heat exchangers
Submission Author:
Ricardo Schneider Calomeno , SC
Co-Authors:
Jaime Lozano, Jader Riso Barbosa Jr., Paulo Vinicius Trevizoli
Presenter: Ricardo Schneider Calomeno
doi://10.26678/ABCM.ENCIT2016.CIT2016-0292
Abstract
In magnetic refrigeration systems using an active magnetic regenerator (AMR) the thermal performance may have a significant variation according to the heat exchangers employed in the system. The finite overall thermal conductance (UA) of both heat exchangers can limit the cooling capacity obtained by the AMR for a certain temperature span. A mathematical model based in the effectiveness and the number of transfer units method was developed and implemented in a former AMR numerical model. The obtained results have indicated that the performance of the magnetic refrigerator decreases when the overall thermal conductance of the heat exchangers decreases. Another numerical simulations were performed to evaluate the influence of the operating parameters in the thermal performance of the AMR with real heat exchangers. Also, the influence of the heat loss through the AMR casing was analyzed. The results revealed a significant deterioration of the system performance as the thermal conductances are decreased. The system performance is more sensitive to the overall thermal conductance of the hot-side heat exchanger. This should be considered in the design of actual AMR operating with real heat exchangers.
Keywords
magnetic refrigeration, Heat exchanger
