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Experimental characterization of noise source in the suction chamber of a reciprocating hermetic compressor.

Number: pap. n. C5, 1331

Author(s) : REAL M. A., DE MARQUI A. L. L., PEREIRA E., et al.

Summary

The increasing market need for low noise level products has led manufacturers of refrigerating compressors to invest time and financial resources in obtaining adequate projects. A good acoustic project depends first, on the knowledge and characterization of the main noise sources of the considered system. In the case of a reciprocating compressor, one of the most important noise source is the admission system that contains the suction valve, suction chamber and a reactive silencer connected in this chamber. This silencer is necessary to attenuate the noise produced for pressure pulsation in the suction chamber and also the noise due to the suction valve impact during the functioning. This work intends to characterize the noise source of the hermetic compressor suction chamber the silencer will attenuate, and therefore, will define in which frequencies or frequency band the acoustic filter will have its best performance. For this purpose an experimental apparatus was built in order to allow several tests in different conditions such as, different valve plate materials, compressor capacity, refrigerant fluid, and operating frequency. Due to dimensional limitations and high intensity sound field, a piezoelectric pressure sensor was mounted in the suction chamber for this investigation. The frequency band of the data analysis was set to be between 40 Hz and 1.2 k Hz. After data analysis, it was concluded that the noise transmitted for the acoustic attenuator is mostly composed of tone components of the compressor functioning and frequencies below 700 Hz.

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Pages: 8 p.

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Details

  • Original title: Experimental characterization of noise source in the suction chamber of a reciprocating hermetic compressor.
  • Record ID : 30001331
  • Languages: English
  • Source: 2010 Purdue Conferences. 20th International Compressor Engineering Conference at Purdue.
  • Publication date: 2010/07/12

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