Thermodynamic performance on a thermo-acoustic micro-cycle under the condition of weak gas degeneracy

Wu, Feng; Chen, Lingen; Li, Duanyong; Ding, Guozhong; Zhang, Chunping; Kan, Xuxian

doi:10.1016/j.apenergy.2008.07.001

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…A thermoacoustic engine usually consists of several simple parts such as an acoustic resonator, heat exchangers, and a section of porous materials called a regenerator, and thus eliminates mechanical moving components. Therefore, thermoacoustic engines are simple, reliable, and almost free of maintenance [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Various prototypes based on different concepts have been constructed, tested and reported [1][2][3][4]. So far, the most efficient traveling-wave thermoacoustic engine [1] delivered 710 W to its resonator with an efficiency of 0.30 which corresponds to 41% of the Carnot efficiency, when the hot end temperature of regenerator reaches 725℃.…”

Section: Introductionmentioning

confidence: 99%

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A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

Kang

Cheng

et al. 2015

Applied Energy

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This paper presents the design, construction and tests of a traveling-wave thermoacoustic electric generator. A two-stage travelling-wave thermoacoustic engine converts thermal energy to acoustic power. Two low-impedance linear alternators (i.e., audio loudspeakers) were installed to extract and convert the engine's acoustic power to electricity. The coupling mechanism between the thermoacoustic engine and alternators has been systematically studied numerically and experimentally, hence the optimal locations for installing the linear alternators were identified to maximize the electric power output and/or the thermal-to-electric conversion efficiency. A ball valve was used in the loop to partly correct the acoustic field that was altered by manufacturing errors. A prototype was built based on this new concept, which used pressurized helium at 1.8 MPa as the working gas and operated at a frequency of about 171 Hz. In the experiment, a maximum electric power of 204 W when the hot end temperature of the two regenerators reaches 512℃ and 452℃, respectively. A maximum thermal-to-electric efficiency of 3.43% was achieved when the hot end temperature of the two regenerators reaches 597℃ and 511℃, respectively. The research results presented in this paper demonstrate that multi-stage travelling-wave thermoacoustic electricity generator has a great potential for developing inexpensive electric generators.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

Kang

Cheng

et al. 2015

Applied Energy

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“…Compared to traditional heat engines, a thermoacoustic engine has no mechanical moving components and simply consists of a few pipes and heat exchangers. Thus, it has the merits of simple structure, high reliability, and low manufacturing and maintenance costs [1][2][3][4][5][6][7]. The thermodynamic cycle occurring in the regenerator of a traveling-wave thermoacoustic engine is the same as the Stirling cycle.…”

Section: Introductionmentioning

confidence: 99%

A traveling-wave thermoacoustic electric generator with a variable electric R-C load

et al. 2013

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A traveling-wave thermoacoustic electric generator, which is composed of a traveling wave thermoacoustic engine and linear alternators, is promising in solar power generation and energy recovery due to its high efficiency, high reliability, and capability of utilizing low-grade heat. An equivalent acoustic circuit of a linear alternator is first built and analyzed using electro-mechano-acoustical analogy. It is found that the acoustic coupling of the linear alternators to the traveling-wave thermoacoustic engine is crucial to the performance of the system. A traveling-wave thermoacoustic electric generator with a variable electric R-C load is then constructed and experimentally studied. Both the theoretical analysis and the experimental results show the importance of mechanical and electrical resonances to the overall performance of the system. Furthermore, the thermal-to-electric efficiency and the electric power are found to be proportional to the pressure amplitude and the square of it in front of the piston of the linear alternator, respectively. By optimizing the load impedance, the traveling-wave thermoacoustic electric generator has achieved a maximum electric power of 345.3 W with a thermal-to-electric efficiency of 9.34% and a maximum efficiency of 12.33% with an electric power of 321.8 W at around 65 Hz when helium of 3.0 MPa is used as the working gas.

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“…Based on the ideal model, some authors use the theory of the finite time thermodynamic to investigate the performance of the thermo-acoustic micro-cycle [5,6]. But the later analysis shows that the adiabatic steps may be not tally with the fact, they establish a new model which consists of two isobaric branches connected by two straight-line branches for further research [7,8]. Based on these researches, in this paper, an actual micro-cycle model will be adopted to study a thermo-acoustic refrigeration micro-cycle.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance of an Actual Thermo-Acoustic Refrigeration Micro-Cycle

Wang

Fei

et al. 2012

AMR

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Thermo-acoustic refrigerator is a new type of engine, which is based on the thermo-acoustic effect. A new model which expresses as an ellipse in pressure-volume diagram is established to investigate the thermodynamic performance of an actual thermo-acoustic refrigeration micro-cycle. The demarcation points of endothermic processes and exothermic processes in the actual micro-cycle are found. The analytic expressions of the dimensionless cooling load and the coefficient of performance (COP) are deduced. The relationship between the dimensionless cooling load and the COP are investigated by numerical examples. The results show that the dimensionless cooling load is a monotonically increasing function of the COP and the pressure amplitude.

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Thermodynamic performance on a thermo-acoustic micro-cycle under the condition of weak gas degeneracy

Cited by 17 publications

References 14 publications

A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

A traveling-wave thermoacoustic electric generator with a variable electric R-C load

Thermodynamic Performance of an Actual Thermo-Acoustic Refrigeration Micro-Cycle

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