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Muffler design for refrigerator compressor.

Number: pap. 1146

Author(s) : DONE V., VENKATESHAM B., TAMMA B., et al.

Summary

During its operation, a refrigerator compressor produces pulsating noise, primarily driven by the suction and discharge processes. Sound attenuating mufflers need to be designed without any additional pressure drop on both suction and discharge side. Higher pressure drop at the suction and discharge side will lead to lower charging and discharging of the compressor and hence reduces cooling capacity. Since a one dimensional formulation with plane wave assumption to calculate transmission loss is not applicable for small mufflers (ratio of length to diameter is less than 1), a numerical methodology was established and validated using an impedance tube transmission loss measurement. Detailed three dimensional Computational Fluid Dynamics (CFD) simulations were used to further study the pressure drop across the mufflers for a given flow and compressor operating frequency. In the proposed methodology, acoustic pressure distribution inside the chamber is observed as a function of frequency and an optimal position of inlet and outlet pipes is decided to improve transmission loss. Different muffler design options were evaluated and also discussed possible acoustic performance and pressure drop improvements. Mufflers designed with this approach showed better acoustic performance on the suction and discharge side of refrigerator compressor. The effect of different working fluids on acoustic frequencies is also studied, which would additionally help in tuning the muffler to improve its effectiveness.

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Pages: 7 p.

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Details

  • Original title: Muffler design for refrigerator compressor.
  • Record ID : 30013969
  • Languages: English
  • Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
  • Publication date: 2014/07/14

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