The IEA HPT Annex 63 (Placement Impact on Heat Pump Acoustics) acts as a follow up to the Annex 51, which laid the groundwork concerning acoustics for heat pumps. The work in Annex 63 is coordinated by the Austrian Institute of Technology (AIT).
While the Annex 51 had a strong focus on the acoustic signatures on heat pumps investigating, for example, the different components, a revision of cases of complaints showed, that the placement of heat pumps is a key factor for a successful installation, i.e., a low acoustic impact on the environment.
Thus, the Annex 63 will contribute to the following topics:
• Building acoustics impact of heat pumps
• Urban acoustics impact of heat pumps
• Psychoacoustics of heat pumps
• Digitally assisted heat pump placement
Additionally, cooling becomes of increasing importance, and thus Annex 63 will also include work on the acoustics of cooling modes.
The main work of the Acoustics Research Institute will focus on modeling the perception of transient noise, for example, when the operation mode changes. For this, the suitability of existing models will be investigated. Furthermore, existing experimental data on transient heat pump noise will be analyzed and the results combined with models on stationary noise.
More detailed information about the Annex including reports can be seen under