MSc thesis seminar: "Development of scroll compressor and expander model working with supercritical carbon dioxide" by Baptiste Gouabau

Abstract:

"This thesis presents the development of a numerical model for scroll
compressors and expanders operating with supercritical carbon dioxide
(sCO2) as the working fluid. The insights gained aim to support the design and
optimization of scroll machines for supercritical CO2 applications, particularly
in the context of waste heat recovery cycles, while identifying future steps
needed to validate and enhance the model.

The study addresses key challenges in scroll machine modeling, including
the accurate representation of internal leakage with supercritical CO2. The
study compares various leakage modeling approaches in scroll machines with
supercritical CO2 flow modeling through orifice methods. Finally, the selected
methods are evaluated to assess their impact on the overall performance of the
model.

Additionally, the thesis investigates the thermal modeling of the scroll,
including heat transfer correlations tailored for supercritical CO2, and assesses
their influence on the accuracy and reliability of the numerical model. The
findings provide a foundation for further advancements in scroll machine
development and contribute to the broader understanding of supercritical CO2
behavior in such systems."