Abstract
In this work, a novel looped low-temperature heat-driven thermoacoustic refrigerator is proposed, simulated and analyzed. Under the operating conditions of 10 MPa mean pressure, 50 °C ambient temperature and 290 °C heat source temperature, a total cooling power of 3102W at 10 °C is obtained, corresponding with a coefficient of performance (COP) of 0.41 and an overall relative Carnot efficiency of 13.4%. Then, energy conversion characteristics are illustrated by analyzing the distributions of key parameters including acoustic field, acoustic work and exergy loss. The results indicate that the travelling-wave acoustic field dominates the system with high acoustic impedance in the regenerators, which accounts for the high thermal efficiency. Exergy losses mainly exist in the regenerators and the resonant tubes, which gives a hint for further optimization. Results also reveal that a larger cooling power is obtained under a higher mean pressure and a higher heat source temperature for each cold-end temperature.
Published Version
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