Model and transient Control strategy design of an Organic Rankine Cycle Plant for waste heat recovery of an Internal Combustion Engine

Abstract The multi-sources hybrid polygeneration energy systems are of great interest and topicality as they one the most promising technologies in European’s Green Deal panorama, with aim serving users electrical thermal using a single plant powered by or more sources. In waste heat recovery field Organic Rankine Cycle (ORC) power plants becoming increasingly popular, especially for exploiting medium low temperature sources micro-small scale plant. However, development diffusion this technology is still limited due to high costs consequently prototype experimental assessment performance very poor, non-stationary systems. work modelling validation micro-scale (WHR) coupled control system presented. An ORC has been modelled through map-based model approach piston pump scroll expander while pipes exchangers 1D thermo-fluid dynamic approach. A preliminary comparison was made between some numerical quantities same 61 different operating conditions, showing an average error 50.1%. calibrated vector optimization technique: two calibration parameters were genetic algorithm (MOGA II) reducing 5 obtained from respective 15 conditions. remaining 46 conditions used evaluate model, 3%. Furthermore, order provide use highly variable sources, such exhaust gases internal combustion engine, strategy designed perform tasks: leading where efficiency higher, acting on speed control, implemented look-up table protecting organic fluid damage caused working temperatures bypass PI depending proportional integral gains. verify behaviour at transient inputs, set simulations run, robust stable manner preserving properties limiting superheated steam inlet.