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„heat pumps“

Sound­check for heat­pumps: Psychoa­coustics for minimum noise gener­a­tion

Air/water heat­pumps with heat outputs from 3 to 30 kW enjoy a high level of accep­tance in heating tech­nology. However, they do not work completely silently and the more dense the build­ings are, the more the neigh­bors can get disturbed by noise pollu­tion. It is by no means just the measur­able sound pres­sure level that is crucial, but human noise percep­tion, which is where psychoa­coustics and its exam­i­na­tion methods come into play.»

F-Gas Regu­la­tion: Fans meet the chal­lenge

According to the so-called F-Gas Regu­la­tion, emis­sions of fluo­ri­nated green­house gases (F-gases) in the EU are to be signif­i­cantly reduced by 2030. It is there­fore essen­tial to switch to natural refrig­er­ants with a low global warming poten­tial (GWP). However, these are often flam­mable. This means that all compo­nents installed in heat pumps, for example, must meet the stan­dards for flam­mable refrig­er­ants. This also applies to the fans used, but these also need to be as quiet and energy-effi­cient as possible.»

The right solu­tion for every instal­la­tion situ­a­tion

Fans are complex flow machines, which some­times respond to aero­dy­namic changes in their surround­ings. The instal­la­tion situ­a­tion plays an impor­tant role here. This means that, when installed in the appli­ca­tion, the fan is often not as quiet as hoped for, or less effi­cient than promised in the data sheet. Last but not least, we recom­mend having the fan manu­fac­turer on board at an early stage of in-house unit devel­op­ment. This means there will certainly be no unpleasant surprises later.»

Plug & play axial fans for appli­ca­tions with high back pres­sure

Axial fans are normally used for situ­a­tions when strong air flow with rela­tively low back pres­sure is required. That is why they have not yet been the fan of choice for devices that require a high pres­sure increase. But now that has all changed: ebm-papst’s new axial fans are also suit­able for appli­ca­tions with high back pres­sure, meaning that these types of appli­ca­tions can also benefit from their higher air flow rates.»