Thermoacoustic heat engines (TAHE) are capable of producing acoustic energy from any source of heat energy. Thus, the primary energy source to drive the engine could be conventional or unconventional that includes industrial waste heat, solar energy and fossil fuels. It has no moving parts thus; chances of mechanical failure are extremely low. The present work main goal is to demonstrate an optimization process that would yield a better efficiency of thermoacoustic engine model. Computational investigations were carried out to improve the efficiency of a 1.05 meter thermoacoustic heat engine using air at atmospheric pressure and 900 K temperature as the working fluid. The efficiency optimization process was implemented by performing an optimization process of stack parameters, like stack shape (i.e. Rectangular, Honeycomb, Slab, and etc.), stack plates spacing, stack length and stack material. The present optimization process has shown that slab stacks made of Celcor (a Celcor material) demonstrated much better performance than other stack shapes and materials which resist such high temperatures. For a 1.124-meter-long and 0.011 m2 square-shaped resonator tube, a 7.75 cm long slab stack made of Celcor having 0.304 mm-thick-plates, spaced by 0.648 mm, giving a porosity ratio of 0.68067, will theoretically convert heat to acoustic power at an efficiency of 30.611% which is equivalent to 47.97% of Carnot's efficiency. The paper ends with a brief summary of conclusions.
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