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Type: Conference paper
Title: Air-cooled binary rankine cycle performance with varying ambient temperature
Author: Varney, J.
Bean, N.
Citation: Proceedings: Geothermal Resources Council Annual Meeting 2012 (GRC 2012): Geothermal: Reliable, Renewable, Global, 30 September – 3 October 2012, Reno, Nevada, USA: pp.1125-1131
Issue Date: 2012
Series/Report no.: Geothermal Resources Council Transactions; Vol. 36
ISBN: 9781622764341
ISSN: 0193-5933
Conference Name: Geothermal Resources Council Annual Meeting (36th : 2012 : Reno, Nevada, U.S.A.)
Statement of
Varney, J. and N. Bean
Abstract: Air-cooling is necessary for geothermal plays in dry areas and ambient air temperature significantly affects the power output of air-cooled thermal power plants. Hence, a method for determining the effect of ambient air temperature on subcritical and supercritical, air-cooled binary Rankine cycles using moderate temperature geothermal fluid and various working fluids is presented. Part of this method, includes a method for maximizing working fluid flow from a supercritical heat exchanger. In the example presented isobutane is used as the working fluid, while the geothermal fluid temperature and flowrate are set at 150°C and 126kg/s. Results of this analysis show that for every 14°C increase in ambient air temperature, above the ambient temperature used for design purposes, there is -20% loss in brine efficiency; while conversely, there is no gain in brine efficiency for any drop in ambient air temperature below the ambient air temperature used for design purposes. Using the ambient air temperature distribution from Leigh Creek, Australia, this analysis shows that an optimally designed plant produces 6% more energy annually than a plant designed using the mean ambient temperature.
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Mathematical Sciences publications

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