Navegando por Palavras-chave "Thermomagnetic effect"

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    Motores termomagneticos, linear e rotativos, acionados por energia solar
    (Universidade Federal de São Paulo, 2013-01-08) Ferreira, Lucas Diego Rodrigues [UNIFESP]; Silva, Isaias da [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    This dissertation presents a study for the improvement and optimization of thermomagnetic motors of the linear reciprocating type and variable reluctance rotative type. The operating principle of such motors is the changing of the magnetic state presented by certain materials when heated above its Curie temperature (Tc). The motors were built with thermomagnetic materials with Tc around 50° C, allowing for the use of water heated in flat plate solar panels (with temperatures around 80° C) as a source of energy for conversion into mechanical energy. Analyses were performed in order to identify ways in which the power and performance of these motors can be improved. Computational simulations were performed in order to analyze: i) the thermal exchange between the magnetic materials and working fluids, through computational fluid dynamics simulation (CFD), ii) the force produced by the interaction between the magnetic materials and the motor permanent magnets arrangement, using computational electromagnetics simulation (EMC) and iii) the dynamics of the motor operation, using multi-bodies dynamics simulation (MBD). Some experiments and analysis were performed on prototypes of the motors with settings similar to those simulated, allowing the comparison between the computational results and the experimental data, and with it validating the computational models developed. Finally, some changes are proposed to the constructed prototype and ideal parameters defined for the construction of more efficient thermomagnetic motors, capable of converting the thermal energy obtained from solar energy into useful mechanical energy.