GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


Bibliographic Citation



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Title: Investigations of supercritical CO2 Rankine cycles for geothermal power plants
Creator/Author: Sabau, Adrian S [ORNL] ; Yin, Hebi [ORNL] ; Qualls, A L [ORNL] ; McFarlane, Joanna [ORNL]
Publication Date:2011 Jan 01
OSTI Identifier:OSTI 1023851
Report Number(s):None
DOE Contract Number:DE-AC05-00OR22725
Document Type:Conference
Specific Type:
Coverage:
Resource Relation:Conference: Supercritical CO2 Power Cycle Symposium, Boulder, CO, USA, 20110525, 20110525
Other Number(s):
Research Org:Oak Ridge National Laboratory (ORNL)
Sponsoring Org:EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
Subject:15 GEOTHERMAL ENERGY; BRAYTON CYCLE; DESIGN; EFFICIENCY; GEOTHERMAL POWER PLANTS; HEAT EXCHANGERS; HEAT SOURCES; RANKINE CYCLE; SIMULATION; THERMODYNAMIC CYCLES; WASTE HEAT; WORKING FLUIDS
Keywords:
Description/Abstract:Supercritical CO2 Rankine cycles are investigated for geothermal power plants. The system of equations that describe the thermodynamic cycle is solved using a Newton-Rhapson method. This approach allows a high computational efficiency of the model when thermophysical properties of the working fluid depend strongly on the temperature and pressure. Numerical simulation results are presented for different cycle configurations in order to assess the influences of heat source temperature, waste heat rejection temperatures and internal heat exchanger design on cycle efficiency. The results show that thermodynamic cycle efficiencies above 10% can be attained with the supercritical brayton cycle while lower efficiencies can be attained with the transcritical CO2 Rankine cycle.
Publisher:
Country of Publication:US
Language:English
Size/Format:Medium: X
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System Entry Date:2013 Jun 06
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