Prediction of Noise Generated by Expansion Devices Throttling Refrigerant

摘要

A method is presented for predicting the noise generated by expansion devices throttlingrefrigerant, based on an existing standard model for predicting the noise downstream of large,industrial control valves throttling air. The presented method can be used to predict the noisedownstream of any expansion device of any size for any pure two-phase or pure vaporrefrigerant flow. Comparison of the model predictions to experimental data for orifice tubes,capillary tubes, and refrigerant valves show excellent agreement over a wide range of operatingconditions. Experimental results for the attenuation of sound waves in a two-phase refrigerantflow are also presented, as well as direct comparisons of the noise generated by differentexpansion devices over similar operating conditions.