Influence of stack geometry on the performance of thermoacoustic refrigerator

Nayak, Biswajit; Pundarika, G; Arya, Bheemsha

doi:10.1007/s12046-016-0585-5

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The TAR is designed and constructed for a cooling load of 10W using pure as the working fluid. [17]. In this study, aluminum sleeves and mylar sheet material are used to fabricate the parallel plate stack to study the effect of spacing on the performance of TAR.…”

Section: Fig1: Cross-sectional View Of Thermoacoustic Refrigerator Mmentioning

confidence: 99%

“…The same model is simulated by using DeltaEC which estimates -47 o C and -48 o C are the lowest temperatures for the convergent-divergent and hemispherical resonator designs respectively. Nayak B et al, [17] [18] have studied the effect of dynamic pressure on the TAR performance for different operating conditions. The experimental setup was fabricated by using aluminum with 2 mm polyurethane coating inside the resonator to reduce the heat losses.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Parallel Plate Stack Spacing on the Temperature Difference of Thermoacoustic Refrigerator by using Helium as a Working Medium

N V*,

Arya

2019

IJRTE

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The refrigerants are usually provided in the conventional refrigeration system despite the fact that, they produce CFCs and HCFCs, which are hazardous to the environment. However, these disadvantages can be overcome using air or inert gas in the thermoacoustic refrigeration system. The present research involves the effect of spacing of parallel plate stack on the performance of thermoacoustic refrigerator (TAR) in terms of temperature difference (∆T). The entire resonator system as well as other structural parts of the refrigerator are fabricated by using PVC to reduce conduction heat loss. Three parallel plate stacks have been used to study the performance of TAR considering different porosity ratios by varying the gap between the parallel plates (0.28 mm, 0.33 mm and 0.38 mm). The parallel plate stacks are fabricated by using aluminium and mylar sheet material and the working fluid used for the experimental study is helium. The experiments have been carried out with different drive ratios ranging from 0.6% to 1.6% with operating frequencies of 200 – 600 Hz. Also the mean operating pressure used for the experiment is 2 to 10 bar and cooling load of 2 to 10W are considered. The ∆T between the hot heat exchanger and cold heat exchanger is recorded using RTDs and Bruel and Kjaer data acquisition system. Experimental results shows that the lowest temperature measured at cold heat exchanger is -2.1 oC by maintaining the hot heat exchanger temperature at about 32 oC. The maximum temperature difference of 32.90 oC is achieved.

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Section: Fig1: Cross-sectional View Of Thermoacoustic Refrigerator Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Parallel Plate Stack Spacing on the Temperature Difference of Thermoacoustic Refrigerator by using Helium as a Working Medium

N V*,

Arya

2019

IJRTE

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“…Wantha et al in [30] proved that the optimal operating frequency of a standing-wave thermoacoustic refrigerator differs from the design based on the equation f = a∕2L , where L is the resonator length and a is the speed of sound. The influence of the operating frequency on the temperature difference created across the stack was also investigated in [31,32], whereas, for example, in [33] the thermoacoustic refrigerator with the different stack geometry was examined under different cooling loads.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a small capacity thermoacoustic refrigerator

2019

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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.

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