| Summary: | 碩士 === 北台灣科學技術學院 === 機電整合研究所 === 98 === Energy density and power density are two of the most significant specifications for a fuel cell system. Generally speaking, energy density should be derived from the fuel cell efficiency. All these performance indices are closely correlated with the control variables of the balance of plant (BOP). The present thesis proposes an optimization algorithm that maximizes the fuel cell efficiency. The strategy is based on the semi-empirical model of efficiency evaluation, accompanying considerations of practical demand. It achieves the following objectives. 1) Experiments of efficiency evaluation are performed and studied by comparing with the values derived from the semi-empirical model. 2) For a given power demand, the efficiency is maximized subject to operating temperature, voltage, and fuel concentration as design variables that serves as the basis of the control strategy. 3) The feasibility of the control strategy and the semi-empirical model are verified on an instrument-based integrated testing platform. A well-designed control strategy not only ensures the safety of the system, but also enhances its energy density. The present thesis is of importance both on academic investigation and practical applications. Meanwhile, it is also meaningful on the environmental issues since the enhancement of energy efficiency will attenuate carbonaceous pollution.
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