VIBRO-ACOUSTIC ANALYSIS AND IMPROVEMENT OF REFRIGERATORS WITH COMPRESSOR COMPARTMENT UPSIDE

Today's home appliance trend is to release a new design in a very short time. It is also expected that the new design should be cheaper and higher quality standards. In this paper, a marketing research about refrigerators is presented on the basis of sound power levels. A high capacity refrigerator with compressor compartment upside is vibro-acoustically examined and improved. Sound power level of the refrigerator is measured and its main noise sources are localized by sound intensity mapping. A special sound insulation material is developed and also a new type of condenser fan is selected for the treatment of noise

Flow-induced noise in refrigerators

© 2016, German Acoustical Society (DEGA). All rights reserved.Vibration and noise problems due to fluid flow occur in many refrigerators. This phenomenon obstructs smooth plant operation. The flow-related vibrations are known as "Flow-Induced Vibrations". In the case of piping connected to reciprocating fluid machines, the oscillating (fluctuating) flow generates excitation forces causing to piping vibration. "Flow-Induced Vibrations" cause to "Flow-Induced Noise", known as "Fluctuating Noise". In a refrigerator, refrigerant-induced noise is a combination of fluid-acoustic and vibro-acoustic phenomena. One of the importance sources of the flow-induced noise in refrigerators is two-phase flow at the evaporator inlet. In this study, capillary position design of the evaporator inlet is analysed. Capillary insert length is varied and the effect of this modification is examined by noise tests. The modification results in the abatement of the flow-induced noise