Abstract
In this work, an analytical study on the active magnetic regeneration cycle operating near room temperature using nanofluid as carrier fluid, in order to enhance the heat transfer in regenerator bed after magnetization and demagnetization process. For this purpose, a nanofluid based on Al2O3 has been proposed. A numerical simulation of 1D model based on the transient energy equations is used to describe the heat transfer between the magnetocaloric material and the carrier fluid in the regenerator bed. The obtained results are presented, discussed and compared with base fluid.DOI: http://dx.doi.org/10.5755/j01.mech.23.1.13452
Highlights
In the past few decades, a large number of experimental and numerical studies of magnetic refrigeration devices near room temperature have been published, either in a magnetic refrigeration system or in magnetocaloric materials [1,2,3,4,5,6,7,8,9]
For active magnetic regenerator refrigerator device, the heat transfer plays an important role between magnetocaloric material and carrier fluid
Once steady cyclic state is obtained, the resulting cooling capacity and coefficient of performance can be calculated as follows: The results presented in Fig. 4, show the variation of magnetocaloric effect under magnetic field of 2T and specific heat capacity at magnetic field of 0T and 2T as function of the temperature for magnetocaloric material Gadolinium by using molecular field theory approach
Summary
In the past few decades, a large number of experimental and numerical studies of magnetic refrigeration devices near room temperature have been published, either in a magnetic refrigeration system or in magnetocaloric materials [1,2,3,4,5,6,7,8,9]. For active magnetic regenerator refrigerator device, the heat transfer plays an important role between magnetocaloric material and carrier fluid. It is strongly desirable to increase the efficiency of rate of heat exchange due to the magnetization and demagnetization of magnetocaloric material and carrier fluid. These new advanced concepts of nanofluids offer good heat transfer characteristics compared to conventional fluid. A new concept for intensification of heat transfer was introduced by Masuda et al 1993[10] and Choi 1995 [11] called nanofluids. It becomes possible to increase the efficiency of any machine and reduce the operating costs of magnetocaloric devices. Many researches dedicated to nanofluids are carried out in order to improve heat transfer by convection [12,13]
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