H. E. Khalifa, R. DePippo, J. Kestin

Research output: Contribution to conferencePaperpeer-review

4 Scopus citations


The concept of hybrid utilization of fossil and geothermal energy is discussed. Generalized performance measures are defined. The concept is applied to two types of plant: the geothermal-preheat hybrid and the fossil-superheat hybrid. In the first, the geothermal fluid is used for preheating the feedwater in a Rankine steam power cycle; in the second, steam produced by flashing a geothermal fluid is superheated in a fossil-fired superheater. Both hybrid systems are described and analyzed; figures of merit are computed for each. Results are given for a typical case of a geofluid at 200 degree C, and show that a geothermal-preheat hybrid plant can produce 4% more work than could be obtained from using the fossil fuel in a state-of-the-art power plant, or 60% more work than a state-of-the-art geothermal plant could yield, for the same input.

Original languageEnglish (US)
Number of pages11
StatePublished - 1978
EventEnergy Technol 5, Proc of the Energy Technol Conf, 5th - Washington, DC, USA
Duration: Feb 27 1978Mar 1 1978


OtherEnergy Technol 5, Proc of the Energy Technol Conf, 5th
CityWashington, DC, USA

ASJC Scopus subject areas

  • General Engineering


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