Combined cycles for hybrid fossil/geothermal power generation

H. Ezzat Khalifa

Research output: Chapter in Book/Entry/PoemConference contribution


The paper presents a preliminary technical and economic assessment of a combined cycle in which the bottoming cycle is fed both by the exhaust energy from a combustion engine topping loop and by moderate- temperature energy from a geothermal resource. It is shown that this arrangement offers significant performance and economic advantages over the separate utilization of the two energy inputs. A gas-turbine-topped dual pressure toluene bottoming system matched to a 300 F (-150 C) hydrothermal resource can produce 10 to 20% more power than would be obtained from two separate plants; a conventional flash or binary power plant for the geothermal fluid, and a 35%-efficient combustion power plant for the oil or natural gas burned in the topping loop. The superior performance of the hybrid plant results in a commensurate reduction in the cost of electricity.

Original languageEnglish (US)
Title of host publication1983 Joint Power Generation Conference
Subtitle of host publicationGT Papers, JPGC 1983
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791879368
StatePublished - 1983
Event1983 Joint Power Generation Conference: GT Papers, JPGC 1983 - Indianapolis, United States
Duration: Sep 25 1983Sep 29 1983

Publication series

NameProceedings of the ASME Turbo Expo


Other1983 Joint Power Generation Conference: GT Papers, JPGC 1983
Country/TerritoryUnited States

ASJC Scopus subject areas

  • General Engineering


Dive into the research topics of 'Combined cycles for hybrid fossil/geothermal power generation'. Together they form a unique fingerprint.

Cite this