Design and Optimization of a Loudspeaker Driven 10-W Cooling Power Thermoacoustic Refrigerator

Prashantha, B; Gowda, M. S. Govinde; Seetharamu, S.; Narasimham, G.S.V.L.

doi:10.1142/s2010132514500151

Cited by 18 publications

(22 citation statements)

References 13 publications

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“…Thermo-physical properties of the refrigerator components materials (at P = 10 bar, T mg = 266 K and f = 400 Hz) chosen in the DeltaEC simulation modelling. elsewhere [19,21,22]. The variation of dynamic pressure amplitude P a , volume velocity U, acoustic power input W a and solid material temperature T s , along the length of a 50 W, k/4-TDH resonator design is shown in figure 6.…”

Section: Deltaec Modelling Results and Analysismentioning

confidence: 99%

Design and analysis of acoustically-driven 50 W thermoacoustic refrigerators

Prashantha

Gowda²,

Seetharamu

et al. 2018

Sādhanā

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The design of loudspeaker-driven 50 W cooling power thermoacoustic refrigerators operating with helium at 3% drive-ratio and 10 bar pressure for a temperature difference of 75 K using the linear thermoacoustic theory is discussed. The dimensional normalization technique to minimize the number of parameters involved in the design process is discussed. The variation in the performance of the spiral stack-heat exchangers' at 75% porosity as a function of the normalized stack length and center position is discussed. The resonator optimization is discussed, and the optimized one-third-wavelength (tapered, small diameter tube and divergent section with hemispherical end), and one-fourth-wavelength (tapered and divergent section with hemispherical end) resonator designs show 41.3% and 30.8% improvements in the power density compared to the published 10 W designs, respectively. The back volume gas spring system for improving the performance of the loudspeaker is discussed. The one-third-wavelength and one-fourth-wavelength resonator designs are validated using the DeltaEC software, which predicts the cold heat exchanger temperature of-3.4°C at 0.882 COP, and-4.3°C at 0.841 COP, respectively.

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Section: Deltaec Modelling Results and Analysismentioning

confidence: 99%

Design and analysis of acoustically-driven 50 W thermoacoustic refrigerators

Prashantha

Gowda²,

Seetharamu

et al. 2018

Sādhanā

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“…In the past research work, it was found that the highest stack COP and cooling power and the lowest cold heat exchanger temperature were found at the stack center position X close to the loudspeaker. 2,4,6 But it is very di±cult to fabricate small length spiral pores heat exchangers (less than 5 mm). Also, it is not practically possible to attach loudspeaker and to mount instrumentation with the smaller spacing length (less than 20 mm) available between loudspeaker and hot heat exchanger.…”

Section: Design For Manufacturementioning

confidence: 99%

“…In our past research work, design and optimization of the stack, heat exchangers, resonator and the loudspeaker using linear thermoacoustic theory have been carried out. [6][7][8] There are many types of stack, viz., spiral, circular, parallel plate, etc. In the current research work, we have chosen the spiral stack because of its simplicity in construction and because its optimized performance at 75% porosity is on par with the parallel plate one.…”

Section: Introductionmentioning

confidence: 99%

“…In the current research work, we have chosen the spiral stack because of its simplicity in construction and because its optimized performance at 75% porosity is on par with the parallel plate one. 4,6 The geometry of cold and hot heat exchangers is same as that of the spiral stack to avoid turbulence. In the current research work, the design and optimization of quarterwavelength resonator TDH (taper and divergent section terminated with hemispherical end) design are discussed to improve performance and power density by minimizing surface area to reduce heat dissipation losses (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Stack Spacing on the Performance of Thermoacoustic Refrigerators Using Helium and Air as Working Substances

Prashantha

Seetharamu

Narasimham

et al. 2019

Int. J. Air-Cond. Ref.

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This paper deals with the design of thermoacoustic refrigerators using linear thermoacoustic theory. The refrigerator components are designed at 3% drive ratio by considering the practical limitations of providing sufficient spacing for attaching the loudspeaker to the resonator tube and accommodating instrumentation. The effects of spiral stack spacing in terms of thermal penetration depth on the theoretical performance of refrigerator using helium and air as working substances are discussed. The quarter-wavelength resonator designs with taper and divergent section terminated with hemispherical end are optimized with helium and air for better performance. Theoretical results are validated with DeltaEC software results and are in agreement with each other. Helium shows better performance compared to air but lacks power density. The DeltaEC predicts COP 0.514 at the cold heat exchanger temperature of [Formula: see text]C with helium compared to air (COP 0.616 at [Formula: see text]C) for the 50[Formula: see text]W cooling power 100[Formula: see text]mm diameter quarter-wavelength resonator designs.

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“…They optimized the COP of stack and reported a value of 2.5. Prashantha et al, [15,16] designed and optimized the loud speaker driven 10W cooling power TAR for a ∆T of 120K using linear thermoacoustic theory and also explained the theoretical design procedure for optimizing the resonator. 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.…”

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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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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Design and Optimization of a Loudspeaker Driven 10-W Cooling Power Thermoacoustic Refrigerator

Cited by 18 publications

References 13 publications

Design and analysis of acoustically-driven 50 W thermoacoustic refrigerators

Design and analysis of acoustically-driven 50 W thermoacoustic refrigerators

Effect of Stack Spacing on the Performance of Thermoacoustic Refrigerators Using Helium and Air as Working Substances

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

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