Development of noise pattern map for predicting refrigerant-induced noise in refrigerators
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Abstract
In refrigeration systems, flow state in evaporators is two-phase. Acoustic characteristics of noise generated in pipes with two-phase flow depend on flow patterns and instantaneous cycle conditions. Refrigerant-induced noises are irregular and have a band frequency. Therefore, it is difficult to predict the occurrence conditions of refrigerant-induced noise in evaporators. Hence, the development of a design guide that anticipates the occurrence of refrigerant-induced noise is important. Flow pattern maps have been proposed by Baker, Hewitt, Taitel-Dukler, etc. However, these do not consider the acoustic viewpoint and cannot predict refrigerant-induced noise based solely on the estimated flow patterns. Therefore, in this study, we suggest a noise pattern map for directly anticipating refrigerant-induced noise from various flow patterns. We performed experiments using R600a refrigerant and refrigerant-supply equipment designed for flow visualization and flow regime transition. Based on experimental data, we suggest a noise pattern map for determining the level of refrigerant-induced noise.
Keywords
Annular flow Churn flow Slug flow Noise pattern map Refrigerant-induced noise Two-phase flowPreview
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