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Noise Generation from Expansion Devices in Refrigerant
Technical Paper
1999-01-0866
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
International Off-Highway & Powerplant Congress & Exposition
International Congress & Exposition
Language:
English
Abstract
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.
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Authors
- Enrique Rodarte - Air Conditioning and Refrigeration Center University of Illinois at Urbana-Champaign
- George Singh - Air Conditioning and Refrigeration Center University of Illinois at Urbana-Champaign
- Norman Miller - Air Conditioning and Refrigeration Center University of Illinois at Urbana-Champaign
- Predrag Hrnjak - Air Conditioning and Refrigeration Center University of Illinois at Urbana-Champaign
Citation
Rodarte, E., Singh, G., Miller, N., and Hrnjak, P., "Noise Generation from Expansion Devices in Refrigerant," SAE Technical Paper 1999-01-0866, 1999, https://doi.org/10.4271/1999-01-0866.Also In
References
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