Noise Generation from Expansion Devices in Refrigerant Air Conditioning and Refrigeration Center University of Illinois at Urbana-Champaign

Format:

Conference/Event

Author/Creator:

Rodarte, Enrique, author.

Conference Name:

International Congress & Exposition (1999-03-01 : Detroit, Michigan, United States)

International Off-Highway & Powerplant Congress & Exposition (1999-09-13 : Indianapolis, Indiana, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

1999-01-0866

Access Restriction:

Restricted for use by site license