There is a large need for a high efficiency compressor in small capacity refrigeration and heat pump applications. Current small capacity compressors suffer from various losses, mechanical friction being one of them. The goal of this project is to develop a Torsion Drive compressor which will have a significantly higher efficiency. This will enable large energy savings in existing small refrigeration and heat pump applications, also leading to reduced emissions thanks to the energy savings. The goal of the project is to achieve a working prototype of the torsion drive compressor assembly, a demonstration in a refrigerator adapted for this compressor and to draw guidelines for the production line for this compressor.