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Theses

Energy Storage & Conversion : Waste Heat Recovery in Microgrids by a free piston stirling engine

Abstract : In this study, a combined system of an FPSE and a PMLSM is investigated. First, a linear model (an already developed model in literature) and a nonlinear model (a new applied model in the present study) of the FPSE are developed, and the results of these models are compared. Then the most suitable model for the study, is chosen. It is shown that the linear model cannot identify the realistic behavior of the FPSE; thus, the nonlinear one should be used. After that, the nonlinear FPSE model is validated with available experimental results. After validating the FPSE model, two scenarios, including a decoupled one (an already existed one in literature) and a coupled one (a newly introduced method in the present study), are considered to study the enthalpy pumping loss on the FPSE system. Then the best scenario for the enthalpy pumping, which is the coupled one, is chosen based on the results. After that, the FPSE system is coupled with the presented PMLSM model. In order to combine the thermodynamic model of the FPSE and the electrodynamic model of the PMLSM, their dynamic equations are combined. Then, the thermo-electro-dynamic equations are solved, and the coupled system is controlled in MATLAB Simulink®. Controlling such a system makes it possible to avoid conditions leading to FPSE instability. Moreover, it is feasible to control the system in transient operating modes to get the best performance. After combining FPSE with PMLSM, two control methods are introduced, and their results are compared. These control methods are based on identifying the reference parameters. Then, an application of such a system is presented. This system is used as a waste heat recovery in a tri-generation system. The power source of this tri-generation system is a Solid Oxide Fuel Cell (SOFC) which is combined with a Double Effect Absorption Chiller (DEACH) for cooling production and a heat exchanger for providing the thermal needs. Finally, a study of the sensitivity to the parameters of such a system is performed. Using this analysis provides information concerning the sensitivity of such a system to different parameters.
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https://hal.univ-lorraine.fr/tel-03553021
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Submitted on : Wednesday, February 2, 2022 - 3:39:05 PM
Last modification on : Thursday, February 3, 2022 - 3:43:11 AM
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Mahdi Majidniya. Energy Storage & Conversion : Waste Heat Recovery in Microgrids by a free piston stirling engine. Electric power. Université de Lorraine, 2021. English. ⟨NNT : 2021LORR0206⟩. ⟨tel-03553021⟩

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