Exergetic Performance Investigation of Varying Flashing from Single to Quadruple for Geothermal Power Plants

[+] Author and Article Information
Osamah Siddiqui

2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada Oshawa, ON L1H7K4 Canada osamah.siddiqui@uoit.net

Ibrahim Dincer

2000 Simcoe Street North, UOIT Oshawa, ON L1H 7K4 Canada Ibrahim.Dincer@uoit.ca

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received March 16, 2019; final manuscript received May 8, 2019; published online xx xx, xxxx. Assoc. Editor: Samer F. Ahmed.

ASME doi:10.1115/1.4043748 History: Received March 16, 2019; Accepted May 08, 2019


Geothermal power plants are important renewable energy resources that are considered significant for clean energy production. Flash steam type plants constitute a significant portion of worldwide geothermal power. In this study, single, double, triple and quadruple flash-steam geothermal power plants are investigated with re-injection. The optimal operating points are determined specifically through optimal flashing pressures. The turbine power outputs, energy efficiencies and exergy efficiencies are further studied. An increase in the number of flashing stages from single to double is found to increase the power outputs considerably. However, when the flashing stages are increased from double to triple and triple to quadruple, the increase in turbine power outputs is found to drop significantly. Also, both energy and exergy efficiencies are found to decrease with increasing number of flash stages. The energy efficiencies are obtained to be 28%, 25.5%, 24.2% and 23.5% for single, double, triple and quadruple plants, respectively. Furthermore, the exergy efficiencies are found to be 72.6%, 70.9%, 70.2% and 69.8% for these plants respectively.

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