Quiet Efficient Electric Natural Refrigerant Heat Pump

Duration: 01/2023 - 12/2026
Contracting Authority/ Sponsors: Federal Ministry of Economic Affairs and Climate Action (BMWK); Projektträger Jülich (PtJ)
Project Focus:  
The natural refrigerant R290
© Bosch Thermotechnik GmbH
The natural refrigerant R290.

Heat pumps play a crucial role in the future climate-neutral heating and air conditioning of buildings. In 2021, heat pumps were used in half of all new buildings. Germany recorded the operation of 1.2 million heat pumps in the same year. The majority of these heat pumps (70%) use air as a source. As their numbers continue to rise sharply, an increasing challenge arises: reducing heat pump noise to a minimum. To meet this challenge, a project network of heat pump manufacturers, component suppliers and research institutes has joined forces to minimize the noise generated by air-to-water heat pumps.

In this project network, the reduction of noise emissions from heat pumps is being advanced in a methods project and in various technology projects. The project network is divided into individual, independent projects, each with a different focus on specific areas for improving heat pumps


Method and Technology Projects in the »Queen-HP« Project Group

A more detailed description of the project content and objectives can be found on the following project web pages.

Methods Project


Noise Reduction for Heat Pumps by Noise Emission Analysis at Low Frequencies and Structural Dynamic Analyses 

Technology Project


Model-Based Engineering of Evaporator Periphery

Technology Project


Frequency Converter with APFC for Noise-Reduced Heat Pumps with Refrigerant R290

Technology Project


Microchannel Evaporators with Geometrical Adaptions

More Information on this Topic:

Research Topic

Heat Pumps

Business Area

Climate-Neutral​ Heat and Buildings​