Transmission Loss of Different Configurations of a Refrigerant Muffler Using FEM Approach

摘要

Refrigerant compressors produce pulses at the discharge due to the mechanism of therncompression operation. Pulses can be reduced by using a properly sized muffler placed at arnpredetermined location on the discharge line, as space limitation within the compressor does notrnallow a muffler of adequate volume to be accommodated, which provides the requiredrntransmission loss at the frequencies on interest. The main objective of this paper is to seekrnmeans of increasing the performance of the muffler using design parameters other than thernvolume of the expansion chamber and the size of the transmission lines. A numerical model of arnsimple expansion chamber that is co-centric with the lines of the same diameter was used as arnbaseline. The transmission loss of other configurations, consisting of varying lines’ geometryrnand their location with reference to the expansion chamber, was calculated while its volume wasrnmaintained. Experimental verification was performed in air at ambient conditions. The resultsrnwere extended to the proper refrigerant and operating conditions.