[home] [Personal Program] [Help]

---

Session: Parallel Session: System Design, Optimization and Applications I
Session starts: Thursday 22 September, 10:00
Presentation starts: 10:00
Room: Senaatszaal

---

Emiliano Casati (Process and Energy Department, Delft University of Technology/ Politecnico di Milano, LFM Group)
Piero Colonna (Process and Energy Department, Delft University of Technology)

Abstract:
Thermodynamic conversion of solar radiation is one of the high-potential solutions to the global energy problem [1]. One of the key issues is the high capital cost and relatively low conversion efficiency of current technology [2]. We are exploring the concept of a small capacity modular (30-50 kWe) system powered by linear solar collectors. Economy of scale can be achieved by large series production. The small footprint makes it suitable for easier delivery and installation and the system is applicable even if only limited surface is available for the solar field. The adoption of the supercritical cycle configuration, which does not pose acute problems in terms of operating pressure and temperature with the adoption of complex molecule working fluids, arguably entails benefits from the efficiency and cost point of view, as well with respect to thermal storage and controllability. Challenges are identified with respect to, among others, the high compression ratio pump and the turbo-expander. A siloxane has been selected as the working fluid. A model of the solar absorber is presented, together with its coupling to the model of the power unit, which is capable of off-design simulations. A preliminary design of the equipment has been performed in order to investigate feasibility. Results of system simulations encompassing a solar year are presented. They lead to the preliminary thermodynamic optimization of the system, which is analyzed and discussed. Future work is briefly outlined.