Cooling/refrigerating module for use on roof of rail vehicle, has housings provided with sound absorption units i.e. micro-perforated absorbers, that are provided with transit recesses, and chamber connected with absorbers and housings

摘要

The module has housings (4, 6, 10) provided with sound absorbers i.e. micro-perforated absorbers, that are provided with small transit recesses. A chamber is connected with the micro-perforated absorbers and the housings, where size of the chamber is dependent on blade frequency of ventilators (16). Main sections are attached to the chambers. Plant sections are attached to the housings, where the micro-perforated absorbers are transformed from a planar base body. The absorbers are made of aluminum.