Experimental investigation of thermal performance of random stack materials for use in standing wave thermoacoustic refrigerators

Yahya, Samir Gh.; Mao, Xiaoan; Jaworski, Artur J.

doi:10.1016/j.ijrefrig.2017.01.013

Cited by 32 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar dependence for the lowest temperature was also observed by Setiawan et al [20]. Another experimental optimization of porosity was performed by Yahya et al [21], Tasnim et al [22], Hariharan et al [23] or Alcock et al [24]. The stack location in resonance tube was also extensively studied as well in [25][26][27][28].…”

Section: Introductionsupporting

confidence: 57%

Design and simulation of a small capacity thermoacoustic refrigerator

2019

View full text Add to dashboard Cite

Thermoacoustic refrigerators use acoustic power to transport heat from a low-temperature reservoir to a high-temperature reservoir through a stack in a resonance tube. These devices nowadays can be considered as an alternative cooling technology as they use environmentally friendly working fluids and have few moving components. This paper presents the design procedure of a small thermoacoustic refrigerator with nominal cooling power of 10 W. It explains the design choices with the reasons for using specific parameters. The design strategy applies simplified linear model of thermoacoustic in order to find optimum length and position of the stack. The model of the device was simulated by using a specialized tool DELTAEC. The simulation was performed under different temperatures of the cold heat exchanger varying from 250 to 295 K, and under different drive ratios varying from 0.006 to 0.016. The simulation results show that the cooling power of the refrigerator increases with the increase in the drive ratio and with the increase in the temperature of the cold heat exchanger. It was also found that the EER and the EERC coefficients of the device majorly depend on the temperature difference between the heat exchangers and only slightly depend on the drive ratio. The model achieved maximum cooling power of 55 W at the drive ratio of 0.016 and at the temperature difference between the heat exchangers of 5 K, which corresponded to EER of 2.03 and EERC of 0.034.

show abstract

Section: Introductionsupporting

confidence: 57%

Design and simulation of a small capacity thermoacoustic refrigerator

2019

View full text Add to dashboard Cite

show abstract

“…For the said purpose, researchers have devoted considerable effort, both experimental and numerical, to enhance the stack performance by exploring novel concepts. Some efforts include usage of wet stack or regenerator [30,31], random stack configuration [32], converging stack design [33] and various stack plate edge profiles/shapes [34]. Recently, Auriemma et al conducted a numerical study to compare the performance of stacks with different geometries for building applications [35].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Performance Evaluation of Standing Wave Thermoacoustic Refrigerators with a Multi-Layered Stack

et al. 2020

View full text Add to dashboard Cite

Thermoacoustic refrigerators have huge potential to replace conventional refrigeration systems as an alternative clean refrigeration technology. These devices utilize conversion of acoustic power and heat energy to generate the desired cooling. The stack plays a pivotal role in the performance of Standing Wave Thermoacoustic Refrigerators (SWTARs), as the heat transfer takes place across it. Performance of stacks can be significantly improved by making an arrangement of different materials inside the stack, resulting in anisotropic thermal properties along the length. In the present numerical study, the effect of multi-layered stack on the refrigeration performance of a SWTAR has been evaluated in terms of temperature drop across the stack, acoustic power consumed and device Coefficient of Performance (COP). Two different aspects of multi-layered stack, namely, different material combinations and different lengths of stacked layers, have been investigated. The combinations of four stack materials and length ratios have been investigated. The numerical results showed that multi-layered stacks produce lower refrigeration temperatures, consume less energy and have higher COP value than their homogeneous counterparts. Among all the material combinations of multi-layered stack investigated, stacks composed of a material layer with low thermal conductivity at the ends, i.e., RVC, produced the best performance with an increase of 26.14% in temperature drop value, reduction in the acoustic power consumption by 4.55% and COP enhancement of 5.12%. The results also showed that, for a constant overall length, an increase in length of side stacked material layer results in an increase in values of both temperature drop and COP.

show abstract

“…The results showed, for example, that temperature difference generated across the RVC (reticulated vitreous carbon) stack increases as the porosity increases, reaches maximum value and then decreases when porosity increases further; however, in all cases the temperature differences for RVC stacks were lower than for stacks with regular geometries. The stacks with irregular geometries such as stainless-steel wool, copper scourers, and carbon foam were also investigated by Yaha et al [23] in a standing wave thermoacoustic refrigerator. The apparatus consisted of a half-wavelength resonator filled with air at atmospheric pressure, which operated at a fundamental resonance frequency of 72 Hz.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Thermoacoustic Effect in Easily Accessible Porous Materials

Kajurek

Rusowicz

2020

Energies

View full text Add to dashboard Cite

Thermoacoustic devices are the systems which use acoustic power to transport heat through a stack in a resonance tube. The stack is one of the most important parts of the thermoacoustic systems. It can have different geometries, like parallel plates, circular pores, or pin arrays. However, the fabrication of stacks with regular geometries is sometimes impractical due to material and assembly costs. These problems can be solved by using stack fabricated with random and easily accessible porous materials. In this paper an experimental investigation on the thermoacoustic effect in easily accessible porous materials is presented. The measurements with the stacks were made in a standing wave device filled with air at atmospheric pressure. The reported results confirm that some of the materials with high porosity can be an alternative to a traditional stack geometries and materials.

show abstract

Experimental investigation of thermal performance of random stack materials for use in standing wave thermoacoustic refrigerators

Cited by 32 publications

References 11 publications

Design and simulation of a small capacity thermoacoustic refrigerator

Design and simulation of a small capacity thermoacoustic refrigerator

Numerical Modeling and Performance Evaluation of Standing Wave Thermoacoustic Refrigerators with a Multi-Layered Stack

Experimental Investigation on the Thermoacoustic Effect in Easily Accessible Porous Materials

Contact Info

Product

Resources

About