A compact standing-wave thermoacoustic refrigerator driven by a rotary drive mechanism

Modeling and analysis of a dual-acoustic-driver thermoacoustic heat pump

“…Thereby, the temperature distribution is jointly determined by both components, and its curve is parabolic as seen in the inset. The parabolic temperature profiles were also observed in experiments conducted by Widyaparaga [28] and El-Rahman [29]. Although the acoustic field has a small traveling-wave component at fMax, its |p| is large near fSW (due to acoustic resonance), leading to a large value of ∆T.…”

“…By altering the magnitude and phase difference of loudspeakers, the heat pumping direction along the regenerator was seen to change and reverse. In 2020, El-Rahman et al [29] constructed a TAR driven by two pistons powered by a rotary motor. The TAR operated at 42 Hz and produced a temperature difference of 27 K. Recently, Ramadan [30] manufactured a TAR similar to Poignand's design but with a higher cooling capacity.…”

“…In FigureA1(b), an overall agreement is achieved between the experimental measurements and theoretical estimates of ∆T at selected ϕAB. The deviations of experimental data from the theory are possibly caused by the nonlinear effects such as harmonics, turbulence, mass streaming, etc[29].…”

Investigation on Standing Wave Thermoacoustic Generator Using DeltaEC

“…The program numerically integrates the respective onedimensional (1D) linear acoustic wave equation using Runge-Kutta integration method to solve for the fundamental acoustic variables. The DeltaEC model relies on Rott's linear theory and uses a quasione-dimensional analysis of the dynamic equations [22]. DeltaEC can be used as verification method for design and optimization procedures of thermoacoustic system [20].…”

“…DeltaEC can be used as verification method for design and optimization procedures of thermoacoustic system [20]. Many research groups had carried out geometrical optimization based on either experimental work or numerical solution of linear thermoacoustic theory using software such as DeltaEC [22]. Tijani et al, [23] successfully optimized the stack unit using manual calculation of linear thermoacoustic theory as well as the numerical prediction from DeltaEC model in order to meet the requirement of cooling power at various discrete values of stack parameters including the normalized stack length and stack's center position.…”