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Title: GEOTHERMAL / SOLAR HYBRID DESIGNS: USE OF GEOTHERMAL ENERGY FOR CSP FEEDWATER HEATING

This paper examines a hybrid geothermal / solar thermal plant design that uses geothermal energy to provide feedwater heating in a conventional steam-Rankine power cycle deployed by a concentrating solar power (CSP) plant. The geothermal energy represents slightly over 10% of the total thermal input to the hybrid plant. The geothermal energy allows power output from the hybrid plant to increase by about 8% relative to a stand-alone CSP plant with the same solar-thermal input. Geothermal energy is converted to electricity at an efficiency of 1.7 to 2.5 times greater than would occur in a stand-alone, binary-cycle geothermal plant using the same geothermal resource. While the design exhibits a clear advantage during hybrid plant operation, the annual advantage of the hybrid versus two stand-alone power plants depends on the total annual operating hours of the hybrid plant. The annual results in this draft paper are preliminary, and further results are expected prior to submission of a final paper.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
1170300
Report Number(s):
INL/CON-14-32101
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: Geothermal Resources Council 2014 Annual Meeting,Portland, Oregon,09/28/2014,10/01/2014
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
DOE - EE
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 14 SOLAR ENERGY CSP; feedwater heating; geothermal; hybrid; solar