The use of converted primary energy for heating and air conditioning currently represents 45.1% of French consumption. Water distribution networks, which are currently underutilized, could represent significant potential for the production of cold and heat due to the large quantity of water they transport. We aim to quantify the energy potential of these networks while maintaining their normal operation. Calculations of different power values are based on real-time determination of flow temperature and pressure. Interaction with the networks is achieved through heat exchangers optimized by minimizing entropy generation. This approach is applied to a cylindrical heat exchanger in dynamic mode. By incorporating the entropy generation terms resulting from temperature differences and pressure losses along the exchanger, the total entropy generation value is obtained during dynamic operation. In this configuration, the entropy generation related to the mixing of diverted water and network water is also taken into account. The total entropy generation is used as an objective function to optimize the geometry of the heat exchanger (with variable length and diameters) and fluid flows. Results from the application on an actual network are presented.
Seminar by prof. Jean-Henry FERRASSE
Aix Marseille Université, CNRS, Centrale Marseille, M2P2, Marseille, France