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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EXERGY ANALYSIS OF A LOW-GRADE GEOTHERMAL SOURCE DRIVEN BY A ORGANIC RANKINE CYCLE (ORC)
Submission Author:
Carlos Eymel Campos Rodriguez , MG
Co-Authors:
Carlos Eymel Campos Rodriguez, RUBEN ALEXIS MIRANDA CARRILLO, Ariel Rodriguez, Daniel Pereira, Michael Monteiro
Presenter: Carlos Eymel Campos Rodriguez
doi://10.26678/ABCM.COBEM2017.COB17-2695
Abstract
A study on geothermal source driven by a Organic Rankine Cycle (ORC) is presented in this paper using conventional and exergy analysis methods to provide information about system components interactions. Different operating conditions are performed for system components in order to obtain the magnitude of the destroyed exergy related to the various components of a plant, and determinate which components contribute most to the inefficiency of the plant. For this analysis different operating parameters where evaluated such as: superheat vapor level at the turbine inlet, the pinch temperature and the vaporization pressure, which directly affect the performance of the system. For this analysis 15 different working fluids where studied in a geothermal heat source varying from 90 oC to 140 oC. For each temperature of the geothermal source there is a fluid where the best cycle performances are obtained. The highest net power obtained is 37.4 kW, working with R-152a. A wrong selection of the working fluid can lead to a reduction of more than 40% in power produced. For all working fluids the destroyed exergy has a similar behavior in the system. It is presented as the major responsible for the exergy destruction rate (approximately 80% of the total exergy destroyed) the evaporator, followed by the condenser, the turbine and finally the pump.
Keywords
exergy, Organic Rankine Cycle, exergy destruction rate, working fluids
