Numerical Analysis of a Thermally Driven Thermoacoustic Heat Pump for Low-Grade Heat Recovery

Yu, Zhibin; Al-Kayiem, Ali

doi:10.1615/.2014010661

Cited by 5 publications

(2 citation statements)

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“…As a result, the phase angle has been sharply shifted from 18° to 39° within the engine core section as shown in Figure 5. This is similar to a typical looped-tube travelling wave thermoacoustic engine [16]. The phase angle is then shifted back to around 12° where the bypass pipe re-joins with the engine branch at Junction 2.…”

Section: Modelling and Simulations Of A Bypass Enginesupporting

confidence: 61%

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Al-Kayiem

2016

Energy

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A new configuration ("a looped-tube with a bypass pipe") was recently proposed for low temperature travelling wave thermoacoustic engines and a prototype using atmospheric air as the working gas achieved an onset temperature difference as low as 65 °C. However, no further research has been reported about this new configuration to reveal its advantages and disadvantages. This paper aims to analyse this type of engine through a comprehensive numerical research. An engine of this type having dimensions similar to the reported prototype was firstly modelled. The calculated results were then qualitatively compared with the reported experimental data, showing a good agreement. The working principle of the engine was demonstrated and analysed. The research results show that an engine with such a bypass configuration essentially operates on the same thermodynamic principle as other travelling wave thermoacoustic engines, differing only in the design of the acoustic resonator.Both extremely short regenerators and a near-travelling wave resonator minimise the engine's acoustic losses, and thus significantly reduce its onset temperature difference. However, such short regenerators likely cause severe heat conduction losses, especially if the engine is applied to heat sources with higher temperatures. Furthermore, the acoustic power flowing back to the engine core is relatively low, while a large stream of acoustic power has to propagate within its resonator to maintain an acoustic resonance, potentially leading to low power density. The model was then applied to design an engine with a much longer regenerator and higher mean pressure to increase its power density. A thermoacoustic cooler was also added to the engine to utilise its acoustic power, allowing the evaluation of thermal efficiency. The pros and cons of the engine configuration are then discussed.

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Section: Modelling and Simulations Of A Bypass Enginesupporting

confidence: 61%

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Al-Kayiem

2016

Energy

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“…For this reason, it is interesting to note that [69] identified that the symmetrical geometry conditions led to an asymmetrical acoustic condition in their three-stage travelling-wave TAE.…”

Section: Validation Of Deltaec Resultsmentioning

confidence: 99%

Asymmetrically heated multi-stage travelling-wave thermoacoustic electricity generator

Kisha

Riley

McKechnie

et al. 2021

Energy

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Effect of Gedeon streaming on thermal efficiency of a travelling-wave thermoacoustic engine

Tang

Feng

Jin

et al. 2017

Applied Thermal Engineering

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Numerical Analysis of a Thermally Driven Thermoacoustic Heat Pump for Low-Grade Heat Recovery

Cited by 5 publications

References 0 publications

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Numerical investigation of a looped-tube travelling-wave thermoacoustic engine with a bypass pipe

Asymmetrically heated multi-stage travelling-wave thermoacoustic electricity generator

Effect of Gedeon streaming on thermal efficiency of a travelling-wave thermoacoustic engine

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