Numerical analysis on a four-stage looped thermoacoustic Stirling power generator for low temperature waste heat

Wang, Kai; Qiu, Limin

doi:10.1016/j.enconman.2017.03.023

Cited by 37 publications

(14 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 1E, the external electric resistance R e was adjusted by a wirewound variable resistor (0-50 Ω), and the external electric capacitance C e was varied by a combination of a capacitance box (0-111 μF) and some fixed capacitors. The movement of each motor unit of the LA is controlled by the following equations 17 : The movement of each motor unit of the LA is controlled by the following equations 17 :…”

Section: Experimental Setupsmentioning

confidence: 99%

“…11 In the last decade, researchers have explored the feasibility of low-grade heat recovery by thermoacoustic technology. 16,17 One of the most distinguishing features of this type of engine is the symmetric configuration of three or more identical stages, which is applied to achieve an appropriate acoustic field in all stages. Ceperley 12 claimed that the energy density in a travelling-wave engine could be improved by using multiple regenerators.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance comparison of looped thermoacoustic electric generators with various thermoacoustic stages

et al. 2019

View full text Add to dashboard Cite

Thermoacoustic engine is a kind of novel heat engine based on thermoacoustic effect, with the merits of environmental benignity, simplicity, and reliability. In this work, looped travelling-wave thermoacoustic electric generators (LTTEGs) with one to four thermoacoustic stages have been developed and experimentally studied. It is observed that adding thermoacoustic stages can improve the thermal-electric efficiency of LTTEGs, while whether the extra stages lead to efficiency gain depends on the number of existing stages and other operating parameters (hot temperature, for instance). One main reason is that the Gedeon streaming, which might cause severe heat loss, can be enhanced by adding thermoacoustic stages and increasing hot temperature. The results suggest that the suppression of streaming in the looped thermoacoustic engine with multiple stages is even more urgent than in the traditional travellingwave engine with only one stage.

show abstract

Section: Experimental Setupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance comparison of looped thermoacoustic electric generators with various thermoacoustic stages

et al. 2019

View full text Add to dashboard Cite

show abstract

“…By changing the length and position of the stub, the acoustic conditions in the looped thermoacoustic engine could be accurately adjusted. Besides, researchers have investigated the looped thermoacoustic devices that are applicable to refrigeration, electric generation, and so forth. Zhang et al proposed a looped travelling‐wave thermoacoustic cooler.…”

Section: Introductionmentioning

confidence: 99%

“…When the working gas was helium at 6 MPa, a maximum electric power of 4.69 kW was obtained, and the corresponding thermal‐to‐electric efficiency was 15.6%. Wang and Qiu proposed a looped thermoacoustic electric generator to harvest low‐grade heat, from which a maximum electric power of 1223 W, with the corresponding relative Carnot efficiency of 15.6%, was obtained at the hot temperature of 300°C. Yang et al developed a three‐stage looped thermoacoustic electric generator for low‐grade heat utilization.…”

Section: Introductionmentioning

confidence: 99%

Performance of an air‐cooled looped thermoacoustic engine capable of recovering low‐grade thermal energy

et al. 2020

View full text Add to dashboard Cite

Summary An air‐cooled looped thermoacoustic engine is designed and constructed, where an air‐cooled cold heat exchanger (consisting of copper heat transfer block, aluminum flange, and aluminum fin plate) is adopted to extract heat and the resonant tube is spiraled and shaped to fit to the available space. Experiments have been conducted to observe how onset temperature difference and resonant frequency are affected by mean pressure, working fluid, and diameter of compliance tube. Besides, the influences of temperature difference, mean pressure, working fluid and diameter of compliance tube on pressure amplitude, output acoustic power, and thermal efficiency of the system have been investigated. The air‐cooled looped thermoacoustic engine can start to oscillate at a lowest temperature difference of 46°C, with the working fluid of carbon dioxide at 2.34 MPa. A highest output acoustic power obtained is 6.65 W at a temperature difference of 199°C, with the working gas of helium at 2.58 MPa, and the thermal efficiency is 2.21%. This work verifies the feasibility of utilizing low‐grade thermal energy to drive an air‐cooled looped thermoacoustic engine and extends its application in the water deficient areas.

show abstract

“…12,13 Other categories of dynamic Stirling engines are known as Fluidyne and free piston Stirling engines, which are not within the scope of this article. [19][20][21][22][23][24] In addition, they are self-starting, while this latest issue is a challenge in other dynamic Stirling engines, ie, the free piston Stirling engines. In standingwave thermo-acoustic engines, self-sustained oscillating pressure waves are first generated using the applied heat and then are converted into electricity through reversed acoustical speakers.…”

Section: Introductionmentioning

confidence: 99%

Design of a traveling wave thermo‐acoustic engine based on genetic algorithm

Zare

Tavakolpour-Saleh

2019

Int J Energy Res

View full text Add to dashboard Cite

Summary This paper presents a novel design scheme for traveling wave thermo‐acoustic Stirling engines (TASEs) based on a target frequency using genetic algorithm (GA). First, the effects of engine design parameters on the system performance are studied via root locus method. Accordingly, it is found that the resonator length, the inertance diameter, and the hot gas temperature are the most effective parameters in the engine design procedure. Next, the relation between the closed‐loop poles positions of the thermo‐acoustic system and the effective design variables are described parametrically. Consequently, in order to estimate the optimum values of the effective design parameters as well as the unknown positions of the nondominant poles, an appropriate fitness function based on the desired engine frequency is proposed. Subsequently, a GA is used to achieve the optimal values of design parameters so as to minimize the considered cost function. Finally, the validity of the proposed design technique is verified by comparing the obtained results with the available data of an experimental case study.

show abstract

Numerical analysis on a four-stage looped thermoacoustic Stirling power generator for low temperature waste heat

Cited by 37 publications

References 37 publications

Performance comparison of looped thermoacoustic electric generators with various thermoacoustic stages

Performance comparison of looped thermoacoustic electric generators with various thermoacoustic stages

Performance of an air‐cooled looped thermoacoustic engine capable of recovering low‐grade thermal energy

Design of a traveling wave thermo‐acoustic engine based on genetic algorithm

Contact Info

Product

Resources

About