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20 mins
Dynamic analysis of off-grid ORC plants with various solution for the thermal storage
Paolo - Iora, Gioele Di Marcoberardino, Costante M. Invernizzi, Giampaolo Manzolini, Paolo Belotti, Roberto Bini
Session: Session 1B: Dynamic Simulation
Session starts: Wednesday 13 September, 10:30
Presentation starts: 11:30
Room: Building 27 - Lecture room 02

Paolo - Iora (University of Brescia)
Gioele Di Marcoberardino (Politecnico di Milano)
Costante M. Invernizzi (University of Brescia)
Giampaolo Manzolini (Politecnico di Milano)
Paolo Belotti (Turboden srl)
Roberto Bini (Turboden srl)

Real time matching of electric power generation is a crucial aspect in off-grid systems as well as in case of use of renewable intermittent sources. In this paper, with reference to 1 MWel Turboden biomass ORC plants operating in off-grid systems, we study the possibility to store thermal energy in the form of sensible heat within a storage composed by a bunch of steel or cast iron pipes with variable thickness and different coating materials. Thermal power is taken in and out of the storage by a flow of thermal oil, heated by a biomass furnace, and eventually supplied and converted into electricity by the ORC plant running in an off-grid area. Starting from steady state conditions at 30% of the nominal power of the furnace, we assume an instantaneous increase to 100% of the electric power demand and we study the transient of the system in correspondence of the furnace power ramp. To this purpose, we developed a dynamic finite difference model , for the system composed by the furnace, the ORC plant, the furnace inlet and outlet piping and the thermal storage. It comes out that with a storage system properly designed as function of the furnace power ramp, it is possible to run the ORC at 100% during the analyzed transient, thus allowing a real time matching of the power demand.