Noise generation from expansion devices in refrigerant

Enrique Rodarte, George Singh, Norman Miller, Predrag Hrnjak

Research output: Contribution to journalConference articlepeer-review


An experimental methodology and test facility has been developed to perform measurements of internal sound pressure radiated from expansion devices in refrigerant. The experimental test facility is designed to help attenuate reflected sound waves and minimize both vibrations to the test section and other flow disturbances. Measurements are made using microphones mounted flush to the inner wall of the refrigerant tube and the two-microphone technique is used to account for unattenuated reflections. Results show that expansion noise is related to system operating conditions. When vapor flow is present, the far field expansion noise is significant white noise over the audible frequency range. Downstream screens were found to significantly reduce the noise generated. Also, internal sound pressure attenuation with distance has been measured and the results agree closely with theoretical predictions for visco-thermal attenuation.

Original languageEnglish (US)
JournalSAE Technical Papers
StatePublished - 1999
EventInternational Congress and Exposition - Detroit, MI, United States
Duration: Mar 1 1999Mar 4 1999

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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