Maximum cooling and maximum efficiency of thermoacoustic refrigerators
Tóm tắt
This work provides valid experimental evidence on the difference between design for maximum cooling and maximum efficiency for thermoacoustic refrigerators. In addition, the influence of the geometry of the honeycomb ceramic stack on the performance of thermoacoustic refrigerators is presented as it affects the cooling power. Sixteen cordierite honeycomb ceramic stacks with square cross sections having four different lengths of 26, 48, 70 and 100 mm are considered. Measurements are taken at six different locations of the stack hot ends from the pressure antinode, namely 100, 200, 300, 400, 500 and 600 mm respectively. Measurement of temperature difference across the stack ends at steady state for different stack geometries are used to compute the cooling load and the coefficient of performance. The results obtained with atmospheric air showed that there is a distinct optimum depending on the design goal.
Tài liệu tham khảo
Swift GW (2002) Thermoacoustics: a unifying perspective for some engines and refrigerators. Acoustical Society of America, Melville
Swift GW (1988) Thermoacoustic engines. J Acoust Soc Am 4:1146–1180
Herman C, Travnicek Z (2006) Cool sound: the future of refrigeration? Thermodynamic and heat transfer issues in thermoacoustic refrigeration. Heat Mass Transf 42(6):492–500
Tartibu LK, Sun B, Kaunda MAE (2014) Lexicographic multi-objective optimisation of thermoacoustic refrigerator’s stack. J Heat Mass Transf 51:649–660. doi:10.1007/s00231-014-1440-z
Atchley AA, Hofler TJ, Muzzerall ML, Kite MD (1999) Acoustically generated temperature gradients in short plates. J Acoust Soc Am 88:251–263
Worlikar AS, Knio OM, Klein R (1998) Numerical simulation of a thermoacoustic refrigerator: stratified flow around the stack. J Comput Phys 144:299–324
Marx D, Blanc-Benon P (2005) Numerical calculations of the temperature difference between the extremities of a thermoacoustic stack plate. Cryogenics 45:163–172
Zink F (2009) Identification and attenuation of losses in thermoacoustics: issues arising in the miniaturization of thermoacoustic devices. Ph.D. thesis, University of Pittsburgh, United States
Tu Q, Chen ZJ, Liu JX (2005) Numerical simulation of loudspeaker-driven thermoacoustic refrigerator. Proceedings of the twentieth international cryogenic engineering conference (ICEC 20). Beijing, China
Akhavanbazaz M, Siddiqui MK, Bhat RB (2007) The impact of gas blockage on the performance of a thermoacoustic refrigerator. Exp Therm Fluid Sci 32(1):231–239
Wetzel M, Herman C (1997) Design optimisation of thermoacoustic refrigerators. Int J Refrig 20(1):3–21
Tijani MEH, Zeegers JCH, De Waele ATAM (2002) Design of thermoacoustic refrigerators. Cryogenics 42(1):49–57
Applied Ceramics Inc. (2011) Versagrid™ product offering. http://appliedceramics.com/products_versagrid.htm. Accessed 10 Sept 2013
National Instruments (2013) Thermocouple and RTD sensors. http://www.ni.com/pdf/products/us/3daqsc350-351.pdf. Accessed 10 Sept 2013
Lutron Electronic (2013) Sound level meter model SL-4013. http://www.instrumentsgroup.co.za/index_files/Lutron/database/pdf/SL-4013.pdf. Accessed 10 Sept 2013
National Instruments (2011) http://www.ni.com/labview/
Yong Tae Kim & Min Gon Kim (2000) Optimum positions of a stack in a thermoacoustic heat pump. J Korean Phys Soc 36(5):279–286