A new type of thermodynamic machine was designed and prepared for testing to evaluate
its capability in extracting mechanical energy from low enthalpy heat sources. The
system was completed with a newly designed rotary piston compressor and expander to
improve efficiency. A numerical model was set up using commercially available CFD
code ANSYS Fluent to evaluate the performance of the compressor and to identify the
fluid dynamic related loss sources. In attempt to increase computational efficiency
3D and 2D computations were compared to find the simplest model which provides sufficient
information to capture the important heat transfer and fluid mechanical features.