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Introduction In order to further increase the acceptance of heat pumps, reduction of acoustic emissions is important. To minimize noise annoyance, the focus must be on the acoustics emissions at steady state and on the transient behaviour of acoustic signatures during different ope- rating conditions. The placement of the heat pumps is also of utmost importance, as sound emissions exhibit a pronounced directivity. Especially air to water heat pumps provide a convenient and effective way to exploit potential energy savings and are often used in retrofit in- stallations. However, some of their components, such as compressors and fans, typically produce significant levels of noise. This makes acoustic improvements crucial for their deployment. In Annex 51, acoustic emissions are covered in a hie- rarchical approach considering the following levels: the component level (low noise components), the unit level (system approach of combining the components, unit control, transient acoustic features) and finally the application level (building and neighbourhood including smart grid, psychoacoustic effects and acoustic propa- gation). Objectives » Increase the acceptance of heat pumps; » Increase knowledge and expertise at different levels; » Provide input to national and international standardization; » Preparation of seven Annex meetings: six meetings held (Austria Vienna 06-2017, France Lyon 01-2018, Sweden Borås, 06-2018, Denmark Aarhus, 01-2019, Germany Freiburg 10-2019, online 03-2020), one final planned (Italy, Milano 09-2020); HPT TCP ANNEXES ANNEX 51 ACOUSTIC SIGNATURE OF HEAT PUMPS Fig. 2: Examples of the heat-pump installation in a reverberant test room (top) and climatic chambers (middle and bottom). A microphone array can be seen in the bottom image. [Source: CETIAT, France (top), ISE, Germany (mid) and AIT, Austria (bottom)] Fig. 1: Meeting photo of the 5th working meeting hosted by Fraunhofer ISE on October 17-18 2019 in Freiburg, Germany [Source: ISE, Germany] VOL.38 NO 1/2020 HPT MAGAZINE 15PDF Image | Integration of Heat Pumps into the Future Energy
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