Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Using Organic Rankine Cycle for electricity generation from waste heat
Submission Author:
Valmir de Oliveira Junior , RJ
Co-Authors:
Valmir de Oliveira Junior, Manoel Antônio da Fonseca Costa Filho
Presenter: Valmir de Oliveira Junior
doi://10.26678/ABCM.ENCIT2018.CIT18-0679
Abstract
The Organic Rankine Cycle (ORC) operates similarly to a steam Rankine cycle with the same components, replacing the water by organic fluids with high molecular mass which have lower boiling points. This enables thermal recovery from milder temperature sources, being suitable for electricity generation from solar, geothermal, biomass and residual heat sources. The waste heat in exhaust gas from internal combustion engines corresponds to approximately 55% of the total heat released by the fuel. This manuscript aims at carrying out a thermodynamic modeling of an ORC designed to waste heat recovery from flue gas from the diesel engine Caterpillar 3516C. In this first approach, all assumptions from ideal Rankine Cycle were taken in account. The thermodynamic model for each component of the cycle is based on the mass and energy balances and was done using the software Engineering Equation Solver (EES) from the F-Chart Software. Only n-Pentane, Benzene and Toluene have proved suitable for operating at the mass flow between 0.4 kg/s and 0.5 kg/s using the regenerative cycle and the condensation, intermediary and evaporation pressures fixed ate 0.1 MPa, 1.4 MPa and 2.8 MPa, respectively. Since cycle’s efficiencies overcoming 19% were achieved, the ORC can be a practical device when applied for waste heat recovery from high size diesel engines.
Keywords
Organic Rankine Cycle, Waste heat, Energy Efficiency
