GRETh

Summary : The energy efficiency of thermal components and systems, and the improvement and development of new technologies, are major challenges today. In this general context, the work presented in this thesis aims to improve thermal performance and...

Summary : Faced with growing demand for sustainable aviation, hybrid-electric propulsion systems, particularly those incorporating hydrogen fuel cells due to their high specific energy and potential for zero carbon emissions, are attracting significant interest.

Summary : In order to optimize the energy production of internal and external combustion engines, a better understanding of pulsed flows is necessary. However, these flows are highly dependent on heat transfer within heat exchangers. These exchangers...

Summary : Two-phase thermosyphons allow the efficient and passive transfer of thermal energy from a hot source to a cold source. Their physical principle is based on the natural circulation induced by gravity without the need...

Summary : Heat accounts for 50% of energy consumption in Europe and is still largely produced from fossil fuels (75%). Thermal storage is a key component in the decarbonization of heat production, enabling...

Summary : In the context of the energy transition, power electronics faces several challenges in order to meet the sharp increase in electrical power transmitted. Wide bandgap semiconductor components enable the conversion of higher...

Summary : The search for technological solutions aimed at minimizing the size of a device, known as intensification, is a classic objective of process engineering. In this thesis, the intensification possibilities offered by helical tubes are studied, both...

Summary : Carbon dioxide (CO₂, R744) is a promising alternative for refrigeration systems because it does not contribute to ozone depletion and has very little impact on global warming compared to...

Summary : Efficient heat exchanger design is crucial for cost, sustainability, and energy conservation. Due to its importance, the research interest in optimal HX design has increased across various industries, especially in the aerospace sector. Here, compact heat exchangers with…