Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EMERGY ANALYSIS FOR AN ORGANIC RANKINE CYCLE (ORC) USING DIFFERENT WORKING FLUIDS
Submission Author:
Anelize Terroni Teixeira , SP
Co-Authors:
Anelize Terroni Teixeira, Santiago del Rio Oliveira
Presenter: Anelize Terroni Teixeira
doi://10.26678/ABCM.COBEM2019.COB2019-0107
Abstract
Emergy analysis has been used in recent years to measure environmental and economic impacts associated a production of some form of energy or product. A traditional emergy analysis is divided in three phases. First, all materials required to manufacture the working fluid and cycle equipment are measured in terms of unit and transformity; Second, the necessary inputs to operate the thermodynamic cycle like electricity and waste heat are considered, and third, the inputs necessary to transport all components of system. In this paper, results of an emergy analysis in three different organic fluids were compared to determine the performance of an ORC and to rank it in a scale of short, medium and long-term sustainability, according to EIS (Emergy Index of Sustainability). As such, EES (engineering equation solver) was used to get the thermodynamics parameters for each ORC working fluid; all inputs used along the three phases of emergy analyses had been added to obtain the EIS. R134a and NH3 were classified as sustainable on medium term. R227ea was classified by sustainable in long term. These results show that ORC system is less sustainable in comparison to renewable power plants, but more sustainable than fossil fuel power plants.
Keywords
emergy, Organic Rankine Cycle, life cycle
