Sound reduction in heat exchanger modules by integrating plate absorbers with sub-millimeter openings

Felix Czwielong*, Sebastian Floss, Manfred Kaltenbacher, Stefan Becker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In air conditioning systems heat exchangers are frequently installed upstream of ventilators. These modules are part of the daily life of humans and should therefore create an environment that is as quiet as possible. The heat exchanger generates increased turbulence, which leads to increased sound emissions of the ventilator. Due to installation space limitations, it is not possible to connect silencers to the heat exchanger module. A novel concept is presented, which allows to reduce the sound emissions of heat exchanger due to plate absorbers without the need of additional installation room. The plates contain sub-millimeter openings. They are integrated into the heat exchanger housing together with back volumes. This arrangement guarantees compactness and generates no additional flow resistance. The emitted sound could be reduced by up to 2.9 dB in the partial load range. The main advantages of the concept presented are individual adjustment, cost-effective design and simple installation.

Original languageEnglish
Article number35
JournalActa Acustica
Publication statusPublished - 2021


  • Axial fan
  • Heat exchanger
  • MPA
  • MPP
  • Sound reduction

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Speech and Hearing
  • Electrical and Electronic Engineering
  • Computer Science Applications

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