Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Experimental study and simulation of Organic Rankine Cycle using R123
Submission Author:
RICHARDSON LEANDRO NUNES , SP , Brazil
Co-Authors:
RICHARDSON LEANDRO NUNES, Juliana Silva Brasil, Thalles Coimbra Borba Roldão , Luben Cabezas Gómez, Cristiano Tibiriçá
Presenter: Juliana Silva Brasil
doi://10.26678/ABCM.ENCIT2022.CIT22-0575
Abstract
The consumption from all energy sources in the last 55 years has increased by 275% worldwide, 494% in South and Central America and 1150% in Brazil. From the total amount of the energy consumed around the world, 80% is of fossil origin (oil, natural gas and coal). In Brazil, on the other hand, 80% of the total energy consumed is renewable whereas 61% comes from hydroelectric source, 9% from the wind, other 9% from biomass and 1% from centralized solar source. The wide spread use of fossil fuels is directly related to the emissions of carbon dioxide, the main gas causing the global warming, which gradually increases the average temperature of the planet, as it prevents the rejection of heat accumulated in the earth originated from the incidence of solar radiation. The decrease in the use of fossil energy sources, the increase in the use of renewable energy sources and increase in energy efficiency, from generation to consumption, contributes to the reduction of CO2 emissions and its undesirable effects. Systems that operate according to the Rankine cycle allow the production of electrical energy from thermal sources. Traditionally, water is used as a working fluid and high temperature energy sources, above 370°C, mainly steam boilers. The Organic Rankine Cycle uses organic fluids that have temperatures and evaporation pressures lower than those of water, allowing the use of heat from sources with lower temperatures (between 60 and 250 °C) to generate electricity. In this cycle, the fluid is pressurized by the pump to the evaporator, where it heats at nearly constant pressure and turns into saturated or superheated steam. The steam expands in the expander (turbine, scroll, etc.) producing shaft work and, as a consequence, has its enthalpy decreased. Finally, it is condensed in the condenser at practically constant pressure, returning to the pump. The main objective of this paper is the thermodynamic modeling and the accomplishment of experimental measurements of a system operating according to an organic Rankine cycle (ORC) with R123. The thermodynamic behavior of the cycle was computationally simulated through the Ideal Rankine Cycle model, recording the points between each cycle process. Results were obtained for operating pressures from 171.5kPa to 361.6kPa, vapor temperatures from 68°C to 75°C and mass flow rates from 11.25kg/h to 30.7kg/h.
Keywords
Organic Rankine Cycle, renewable energy, Alternative fuel
