Design, manufacturing and testing of a compact thermoacoustic refrigerator

Ramadan, Islam; Bailliet, Hélène; Poignand, Gaëlle; Gardner, David L.

doi:10.1016/j.applthermaleng.2021.116705

Cited by 27 publications

(9 citation statements)

References 29 publications

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“…The loudspeaker emits acoustic waves at the desired frequency. After that, the acoustic wave moves through the resonator, creating hot and cold temperature areas due to the distribution of high and low-pressure areas through the resonator [7].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Standing-Wave Thermoacoustic Refrigerator Using DELTAEC

Kamil

Yahya

Ilori

2023

DJES

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Thermoacoustic refrigeration is one of the best alternatives to conventional refrigeration systems due to the use of inert gases such as helium or air. On the contrary, conventional refrigeration systems use refrigerants (CFC) that are harmful to the environment and humans due to global warming and ozone layer depletion issues. It is possible to classify thermoacoustic technology as a clean, renewable technology with a bright future due to its many advantages. Thermoacoustic refrigerators' main function is to utilize sound waves to create a cooling effect. In the present study, the focus is on the design of a standing-wave thermoacoustic refrigerator driven by an ordinary loudspeaker using the simulation program DELTAEC. Additionally, investigating the influence of significant stack and resonator parameters (inertance and compliance) on cooling power and performance coefficient (COP). Hence, the designed thermoacoustic refrigerator performed well in respect of cooling power and coefficient of performance. It has achieved a cooling power of 312 W with a temperature difference of 25 K between the ambient and cold heat exchangers at a COP of 1.9275.

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Standing-Wave Thermoacoustic Refrigerator Using DELTAEC

Kamil

Yahya

Ilori

2023

DJES

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“…Following this idea a compact thermoacoustic refrigerator prototype for automobile air conditioning applications was designed and built recently [16]. The prototype was designed using the numerical code DeltaEC [17], based on the linear theory of thermoacoustics (Rott's linear theory [18,19], later extended by Swift [2], Arnott et al [20]).…”

Section: Introductionmentioning

confidence: 99%

“…The code provides an estimate of one-dimensional distributions of pressure, velocity and temperature, for a given system working in the periodic regime. Until now, this approach has been widely used to design thermoacoustic devices, despite observed discrepancies on the thermal quantities [16,21]. These could be associated with nonlinear phenomena such as streaming [22], end effects or natural convection [23,24], known to be responsible for reducing the efficiency of thermoacoustic systems.…”

Section: Introductionmentioning

confidence: 99%

A numerical model of thermoacoustic heat pumping inside a compact cavity

2023

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This paper presents a numerical study of thermoacoustic heat pumping along a stack of solid plates placed inside a compact cavity submitted to an oscillating flow. Velocity and pressure fields are controlled by two acoustic sources: a main “pressure” source monitoring the fluid compression and expansion phases, and a secondary “velocity” source generating the oscillating fluid motion. Numerical simulations are performed with an “in-house” code solving Navier–Stokes equations under a Low Mach number approximation in a two-dimensional geometry. In the linear regime, thermoacoustic heat pumping is correctly described with this model for different sets of parameters such as thermo-physical properties of the stack plates, amplitude of pressure oscillation or of the velocity source, phase shift between both sources. Numerical results on the normalized temperature difference established between the ends of stack plates are in excellent agreement with analytical estimates and experimental results published in the literature. Several configurations corresponding to different thermal conditions applied on the outside wall and an inside separation plate are then considered. If the separation plate is adiabatic, temperature varies linearly along the stack, recovering classical linear theory’s results. If the separation plate is thermally conductive, the model, providing detailed description of local heat and mass transfer, shows that the temperature field becomes fully two-dimensional and thermoacoustic heat pumping is less efficient. The model is well adapted to explore the influence of local heat transfer constraints on the heat pump efficiency and thus well suited for detailed analyses of more complex mechanisms such as buoyancy effects.

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“…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 summary, the existing studies in the literature have demonstrated that the dual-acoustic-driver concept can improve the compactness of the TAR or TAHP while maintaining a comparable heat pumping capacity with traditional single-acoustic-driver thermoacoustic devices.…”

Section: Introductionmentioning

confidence: 99%