RATIONAL THERMODYNAMIC PARAMETERS OF MULTISTAGE POWER CYCLES APPROPRIATE FOR LOW-TO-MODERATE GEOTHERMAL RESOURCES

The geofl uid temperatures of the most promising geothermal areas of Ukraine are estimated to be less than approximately 130^oC. This paper presents the results of a theoretical design study on the thermodynamic cycle parameters of a geothermal power station that would utilize these geothermal resources, and these results are similar to ones given elsewhere. Various confi gurations of the organic Rankine cycle (ORC) are considered. Thermal schemes of 3-stage geothermal power installations are studied. The effectiveness of geothermal power stations with various working fl uids at each stage is investigated. The results of a numerical study of the thermal 3-stage geothermal installation schemes show that at a geothermal liquid temperature of 130^oC the possible total specifi c power output of a turbine is 20.7–20.8 kW per kg/s of a geofl uid flow. The combined 3-stage cascaded system with a bottoming cycle can generate about 15% more power than a simple single-stage binary plant at the same brine inlet conditions
   
Author:  A. Redko ,  O. Redko ,   N. Kulikova ,  S. Pavlovskyi ,  R. DiPippo
Keywords:  geothermal power, organic Rankine cycle, 3-stage cycle, thermal effi ciency, utilization effi ciency, geothermal areas of Ukraine
Page:  380