Abstract
The aim of this work is the energy efficiency assessment of micro cogeneration systems (MCHP) based on biomass gasification for residential application, using a multistage modeling approach. Particular attention has been paid to the optimization of the component assembly, focusing on configurations that allows all the devices operating in their optimal configuration. The gasification stage has been then modeled through an enhanced (i.e., gas¬solid) thermodynamic approach using the CANTERA solver and the Gri¬Mech thermodynamic properties. Several values of temperature and amount of gasifying agent have been taken into account for the simulations. The efficiency of the whole MCHP system has been evaluated supplementing the simulation of the gasification stage with the energy balance of the cogeneration set (i.e., internal combustion engine) and implementing the developed routines in the Matlab¬Simulink environment. In the simulations, the plant is supposed to supply thermal energy to a building considering different scenarios. Dynamic simulation through EnergyPlus software have been performed. The building¬system interactions under different operating and boundary conditions have been assessed. The paper shows the optimal operating conditions and the system size range for residential applications. The gasification¬based micro CHP technology has an high potential and also substantial room for improvement.