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THEORETICAL EVALUATION OF LOUDSPEAKER FOR A 10 WATTS COOLING POWER THERMOACOUSTIC REFRIGERATOR

B. G. PRASHANTHA

JSS Academy of Technical Education, Uttarahalli-Kengeri Road, Bangalore-560 060, India

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M. S. GOVINDE GOWDA

C. Byregowda Institute of Technology, Thoradevandahalli Village and Post, Kolar-563 101, India

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S. SEETHARAMU

Materials Technology Division, Central Power Research Institute, Bangalore-560 080, India

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G. S. V. L. NARASIMHAM

Department of Mechanical Engineering, Indian Institute of Science, Bangalore-560 012, India

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https://doi.org/10.1142/S2010132513500272Cited by:14 (Source: Crossref)

Abstract

This paper presents a design of moving coil loudspeaker for a 10 W cooling power thermoacoustic refrigerator. An electrical model is presented which simulates the behavior of the loudspeaker. The gas spring system for matching the frequency of the commercially available loudspeaker with the frequency of the acoustic resonator tube for maximizing electro-acoustical efficiency of the loudspeaker is discussed. The optimum back volume for the gas spring system is found to be 59.7 cc, which is about 1.9% of the total resonator volume when the loudspeaker frequency and the acoustic resonator frequency is made equal at 400 Hz with a moving mass of 20 g. The effect of force factor Bl on loudspeaker performance is discussed. Analysis results shows that for better performance of a refrigerator, the loudspeaker should be chosen to have a large force factor and small values for electrical and mechanical resistances. The refrigerator system is tested with DeltaEC software and its results are in good agreement with an electrical model results.

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References

G. W. Swift, J. Acoust. Soc. Am. 84, 1146 (1988), DOI: 10.1121/1.396617. Google Scholar
M. Wetzel and C. Herman, Int. J. Refrig. 20, 3 (1997), DOI: 10.1016/S0140-7007(96)00064-3. Crossref, Web of Science, Google Scholar
M. E. H. Tijani, Loudspeaker-driven thermo-acoustic refrigeration, Ph.D. thesis, Eindhoven University of Technology (2001) . Google Scholar
R. S. Wakeland, J. Acoust. Soc. Am. 107, 827 (2000), DOI: 10.1121/1.428265. Crossref, Web of Science, Google Scholar
B. G. Prashanthaet al., Int. J. Air-Condi. Refrig. 21, 1350001 (2013), DOI: 10.1142/S2010132513500016. Link, Google Scholar
M. E. H. Tijani, J. C. H. Zeegers and A. T. A. M. de Waele, J. Appl. Phys. 92, 2159 (2002), DOI: 10.1063/1.1492867. Crossref, Web of Science, Google Scholar
Q. Tuet al., Cryogenics 45, 739 (2006), DOI: 10.1016/j.cryogenics.2005.09.004. Crossref, Web of Science, Google Scholar
M. E. H. Tijani, J. C. H. Zeegers and A. T. A. M. de Waele, Cryogenics 42, 49 (2002), DOI: 10.1016/S0011-2275(01)00179-5. Crossref, Web of Science, Google Scholar
M. E. H. Tijani, J. C. H. Zeegers and A. T. A. M. de Waele, Cryogenics 42, 59 (2002), DOI: 10.1016/S0011-2275(01)00180-1. Crossref, Web of Science, Google Scholar
B. Ward, J. Clark and G. W. Swift, Design Environment for Low-amplitude Thermoacoustic Energy Conversion (DeltaEC software), Version 6.2, Los Alamos National Laboratory (2008), Available at http://www.lanl.gov/thermoacoustics . Google Scholar
I. Paek, L. Mongeau and J. E. Braun, J. Acoust. Soc. Am. 117, 185 (2005), DOI: 10.1121/1.1828500. Crossref, Web of Science, Google Scholar
M. E. Poese, Performance measurements on a thermoacoustic refrigerator driven at high amplitudes, M.S. Project Report in Acoustics, The Pennsylvania State University (1998) . Google Scholar