Analysis of multi-cylinder type liquid piston Stirling cooler

Murti, Prastowo; Shoji, Eita; Biwa, Tetsushi

doi:10.1016/j.applthermaleng.2022.119403

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…where hg is the gas convection heat transfer coefficient and Acont is the contact surface area between the mediums on which heat transfer is active. Considering ideal gas law, the change of gas internal energy in respect of time can be written with equation (4).…”

Section: Thermodynamic Modelmentioning

confidence: 99%

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Simple model of liquid piston compressor

Cerkovnik,

Čurović,

Prezelj

2024

J. Phys.: Conf. Ser.

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The study proposes a new 0D thermodynamic model for the fast and simple evaluation of Liquid Piston compressors whose geometry and operation are determined by large number of parameters. With the proposed model, the evaluation of the parameters becomes easier, more dependencies are found and the understanding of the influences of parameter changes is deepened. Therefore, optimal designs for the mentioned machines can be created and tested experimentally. During the study, the model was validated with experimental and CFD data, and the results showed good agreement. It was found that evaluation criteria need to be defined for each set of geometric and operational parameters in order to compare the designs.

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Section: Thermodynamic Modelmentioning

confidence: 99%

“…When specific gas pressure is reached valve is opened, releasing the compressed gas into storage vessel. Due to ability of reaching high compression ratios Liquid Pistons are useful for hydrogen compressions [3] and industrial coolers [4].…”

Section: Introductionmentioning

confidence: 99%

Simple model of liquid piston compressor

Cerkovnik,

Čurović,

Prezelj

2024

J. Phys.: Conf. Ser.

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“…For the broader implementation of thermoacoustic technology, experts have intensified efforts to develop thermoacoustic electricity generators. Various electrodynamic transduction mechanisms, such as the linear electrodynamic alternator (Gonen and Grossman, 2014;Bi et al, 2017), liquid column (Castrejón-Pita and Huelsz, 2007;Murti et al, 2023), and bi-directional turbine (Timmer and van der Meer, 2019;2020), have been implemented. Recently, flywheel-crank-based mechanisms (Biwa et al, 2020;Penelet et al, 2021) using rotational alternators and liquid-metalbased triboelectric nanogenerators (Zhu et al, 2021) have been reported as acoustic loads for converting heat into electricity through thermoacoustic conversion.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the onset conditions of a thermoacoustic Stirling engine loaded with an audio loudspeaker

Hsu,

Lai

2023

Front. Therm. Eng.

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This paper aims to evaluate the onset conditions of a thermoacoustic Stirling engine loaded with a commercially available audio loudspeaker. The thermoacoustic engine converts supplied heat power into mechanical power in the form of sound, without any mechanical moving parts. The simplicity of the acoustical heat engine holds great promise for high reliability and low cost. By utilizing a readily available electromagnetic device, the engine can serve as a durable solution for practical applications. In this study, we assembled a commercially available moving-coil loudspeaker as a low-cost linear alternator for the thermoacoustic Stirling engine, enabling electric generation from supplied heat. We modeled the loudspeaker using linear control equations and experimentally calibrated its acoustic impedances to estimate the acoustic load. For the part of the thermoacoustic engine, we estimated its acoustic characteristics within the framework of the linear thermoacoustic theory. By solving the characteristic equation resulting from the engine loaded with the audio speaker, we estimated the operational point of self-sustained oscillations excited by the coupling of the loudspeaker and the thermoacoustic engine system. To validate the estimations, we tested a prototype of the combined system, comprising the loudspeaker and the thermoacoustic engine. The results highlight the necessity of precise calibration and accounting for complex geometries within the acoustic load for accurate theoretical estimations, especially when incorporating a commercially available loudspeaker into a thermoacoustic engine.

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Impedance matching for investigating operational conditions in thermoacoustic Stirling fluidyne

Hsu,

Liao

2024

Applied Energy

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Analysis of multi-cylinder type liquid piston Stirling cooler

Cited by 8 publications

References 29 publications

Simple model of liquid piston compressor

Simple model of liquid piston compressor

Evaluating the onset conditions of a thermoacoustic Stirling engine loaded with an audio loudspeaker

Impedance matching for investigating operational conditions in thermoacoustic Stirling fluidyne

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