Estudo do uso do ciclo de Rankine Orgânico para geração de eletricidade a partir da recuperação do calor residual de motores a diesel

Abstract

The Organic Rankine cycle (ORC) operates similarly to a steam Rankine cycle with the same components, replacing water with high molecular weight organic fluids that have lower vaporization points. This allows thermal recovery from milder temperature sources and is suitable for generating electricity from solar, geothermal, biomass and residual heat sources. This work presents an energetic and economical analysis of the use of the residual heat of five diesel internal combustion engines using a ORC, seeking to show through modeling which working fluid has the best eficiency when applied to the energy generation by residual heat recovery . Initially, modeling is carried out with the help of the EES (Engineering Equation Solver) software of the company F-Chart, in which the states are defined, allowing later mass and energy balances. Next, graphs are designed with the behavior of the fluids within a certain mass flow range, so that the restrictions commonly used in CRO are applied, evaluating the electric energy production of the system and its eficiency. Finally, the economic viability of the cycle implementation is discussed, evaluating the cash flow, net present value, internal rate of return and the Payback method.