Thesis

Summary : The European Climate Law aims to achieve carbon neutrality by 2050, with a focus on decarbonising industry. A cornerstone of CO2 emissions reduction, improving energy efficiency consists of the retrofit of industrial processes to make them more energy efficient and then promoting the ...

Summary : The objective of this study is to introduce a passive heat transfer system whose performance will be optimized to reduce the effect of humidity in bio-sourced building materials and particularly in cob mixes. The studied technology is heat pipes combining heat transfer through phase change and flexibility of ...

Summary : In the refrigeration sector, improving the energy efficiency of heat exchangers is a major challenge. Among the methods studied, spraying water directly onto the exchangers appears to be an effective strategy for enhancing heat transfer through evaporative cooling. However, ...

Summary : The continuous increase in power density of electronic and energy storage systems, particularly lithium-ion batteries, imposes increasingly stringent thermal management requirements. Effective temperature control is essential to ensure the reliability, safety, and lifetime of these systems. Among the various passive cooling solutions, phase change materials (PCMs) ...

Summary : Miniaturisation consists of carrying out operations in micrometric or millimetric devices that usually take place in centimetric or metric devices. The reason for this practice is to increase the surface/volume ratio in order to intensify the transfer phenomena (mass and thermal) ...

Summary : Improving the efficiency of heat exchangers is one of the key technological challenges to curb aircraft greenhouse gas emissions. While recent advances in geometric optimization and ...

Summary : The advancement in metal additive manufacturing has tremendously increased the optimization and design possibilities of heat exchangers systems. In this work, we present possible design improvements and an advanced extended surfaces optimization for plate and fins heat exchangers ...

Summary : Nowadays, most refrigeration devices are based on gas compression. The use of these compressed gases has led to serious issues such as ozone depletion and high global warming potential. Several generations of refrigerant gases have been ...

Summary : Decentralised energy systems are being revolutionised by micro-combined heat and power systems (µCHP), which simultaneously provide heat and electricity with reduced emissions, thus playing a crucial role in the global energy transition. A micro gas turbine (µGT) based ...

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...