Determination of the acoustic source data of air source heat pumps (ASHP) for calculating noise from building service equipment

Heat pumps are a central solution for climate-neutral heating and cooling technology in buildings. A heat pump that is permanently connected to the building is referred to as a building service equipment, which represents a source of airborne and structure-borne sound during operation. The prediction of the airborne sound levels in the building is carried out according to DIN EN 12354-5. A complete acoustic characterization of the heat pump is necessary for this calculation.To determine the input data for the prediction calculation of heat pumps, measurements were conducted on three heat pumps. The measurements of airborne sound power are performed according to DIN EN ISO 3743-1 in a thermally insulated test room. Simultaneously, the structure-borne sound power is determined according to DIN EN 15657 on a low mobility reception plate positioned in the center of the test room. In the investigations, the contributions of the fan and the compressor as sources were analyzed and evaluated. The collected data is compiled in a database and serves as input data for future prediction calculations. The measurements conducted are part of the collaborative project Queen-HP MENESA, which focuses on method development for sound reduction in heat pumps at low frequencies.