Experimental and numerical determination of the optimal stack position maximizing cooling efficiency in a thermoacoustic refrigerator
DOI:
https://doi.org/10.31349/RevMexFis.72.030601Keywords:
Thermoacoustic refrigeration, Optimization, Normalization, Standing WaveAbstract
This paper focuses on studying and determining the appropriate distance for the location of the thermoacoustic stack, one of the basic components of thermoacoustic cooling systems. The position of the stack within the resonator tube is of utmost importance as it allows for the proper production of the thermoacoustic effect and maximizes energy exchange in the thermal boundary layer. The procedure used to determine the optimal position of the stack first describes the operating principle and the equations that govern the thermodynamic cycle. Subsequently, numerical modeling is developed by normalizing the variables involved, performing the best adjustment that allows for maximum energy efficiency of the device. The graph of the numerical solution shows the range of possibilities for the position of the stack and explains how it influences the energy efficiency of the system. The experimental validation process is carried out in a thermoacoustic prototype where two series of tests are performed: the first in a certain region by trial and error, and the second using the value found in the numerical modeling. The variable evaluated is the temperature difference using a thermal camera and temperature sensors. Finally, the results show that the best temperature gradient achieved in the cold zone corresponds to the maximum coefficient of performance evaluated in the prototype.
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