Lionel Estel, Michel Delmotte, Isabelle Polaert, Nassima Benamara, Laboratoire de Sécurité des Procédés Chimiques (LSPC), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA), Laboratoire d'Ingénierie des Matériaux (LIM), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Génie des Procédés Catalytiques (LGPC), École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon
International audience; This paper brings to the fore the key parameters set out on thermal yield and energy efficiency in microwave industrial processes, specifically, in the transient phases. It examines in detail two industrial operations: thermoset polymer curing and flow chemistry under pressure. Overall tuning systems are necessary for energy optimisation, but on the other hand, vessels, pipes, moulds and conveyor belts made of lossy materials are required for holding products or carrying materials. The impact of these inserts on the temperature profile of the heated product and on energy (the power usage and energy efficiency), were experimentally and theoretically examined. It was demonstrated that these parameters have to be considered for process design and calculations. Looking at these two examples, one can see how transient phases are crucial for the required power of the microwave generator and the process design.