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Frequency distribution control for flow-induced noise mitigation near expansion device.

Number: 2258

Author(s) : ZHANG Y., ELBEL S.

Summary

Flow-induced noise near the expansion devices can be very annoying to the nearby occupants. Current studies related to flow-induced noise mitigation are focused on the control of noise amplitude. Also, the mitigation of flow-induced noise usually requires extra installation space. In this paper, a new flow-induced noise mitigation method is introduced. Stainless steel mesh is used to modify flow regimes and noise frequency distribution. The mesh can help the bubbles break into smaller ones, thus controlling the frequency of bubbles. A pump R134a system is tested with a needle valve installed in the semi-anechoic chamber. The mitigation effects of flow-induced noise are compared with mesh installed in different sizes and positions. The results show that when the mesh is installed at the valve's outlet, the mitigation effect is better than installed at the inlet. The best mitigation effect shows up when the mesh size is 75 microns. With the help of a high-speed camera, the variation of flow regimes is displayed in this paper. Since the mesh accelerates the flow near the expansion devices, the mitigation of flow-induced noise is also related to the mass flux of flow after acceleration. Also, it shows that noise mitigation decreases as the installation position is further to the valve body.

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Pages: 8 p.

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  • Original title: Frequency distribution control for flow-induced noise mitigation near expansion device.
  • Record ID : 30030632
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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