International Scientific Journal

Thermal Science - Online First

online first only

Energy efficiency comparison between geothermal power systems

The geothermal water which can be considered for generating electricity with the temperature ranging from 80ºC to 150ºC in China because of shortage of electricity and fossil energy. There are four basic types of geothermal power systems, single flash, double flash, binary cycle and flash-binary system, which can be adapted to geothermal energy utilization in China. The paper discussed the performance indices and applicable conditions of different power system. Based on physical and mathematical models, simulation result shows that, when geofluid temperature ranges from 100ºC to 130ºC, the net power output of double flash power is bigger than flash-binary system. When the geothermal resource temperature is between 130ºC and 150ºC, the net power output of flash-binary geothermal power system is higher than double flash system by the maximum value 5.5%. However, the sum water steam amount of double flash power system is 2to 3 times larger than flash-binary power system, which will cause the bigger volume of equipment of power system. Based on the economy and power capacity, it is better to use flash-binary power system when the geofluid temperature is between 100ºC and 150ºC.
PAPER REVISED: 2016-03-22
PAPER ACCEPTED: 2016-03-27
  1. Barbier, E., Geothermal energy technology and current status: an overview Review Article. Renewable and Sustainable Energy Reviews, 6(2002), pp. 3-65
  2. Zheng, K., Dong, Y., A Comparison on Geothermal Development between China and the World, European Geothermal Congress 2013, Pisa, Italy, 2013, pp.1-6
  3. Luo, C., Huang, L., Thermodynamic comparison of different types of geothermal power plant systems and case studies in China, Renewable Energy, 48(2012), pp.155-160
  4. Zheng, K., Han, Z., Steady Industrialized Development of Geothermal Energy in China Country Update Report 2005-2009, Proceedings World Geothermal Congress 2010, Bali, Indonesia, 2010, pp. 1-6
  5. DiPippo, R., Geothermal Power Plants: Principles, applications, case studies and environmental impact. Second Edition, Elsevier Advanced Technology, 2008
  6. DiPippo, R., Geothermal double-flash plant with interstage reheating: An updated and expanded thermal and exergetic analysis and optimization, Geothermics, 48(2013), pp.121-131
  7. Zarrouk, S. J., Moon, H., Efficiency of geothermal power plants: A worldwide review, Geothermics, 51(2014), pp.142-153
  8. Yari, M. Exergetic analysis of various types of geothermal power plants, Renewable Energy, 35(2010), pp.112-121
  9. Clarke, J., James, T., The constrained design space of double-flash geothermal power plants, Geothermics, 51(2014), pp.31-37
  10. Dagdas, A., Oztiurk, R., Thermodynamic evaluation of Denizli Kizildere geothermal power plant and its performance improvement, Energy Conversion and management, 46(2005), pp.245-256
  11. Pasek, A. D., Soelaiman, T. A., Thermodynamics study of flash-binary cycle in geothermal power plant, Renewable and Sustainable Energy Reviews, 15(2011), pp.5218-5223
  12. Efstathios, E., Michaelides, A binary-flashing geothermal power plant, Energy, 9(1984), pp.323-331
  13. Jalilinasrabady, S., Itoi, R., Flash cycle optimization of Sabalan geothermal power plant employing exergy concept, Geothermics, 43(2012), pp75-82
  14. Rosyid, H., Koestoer. R., Sensitivity annlysis of steam power plant-binary cycle, Energy, 35(2010), pp.3578-3586
  15. Koch, C., Cziesla, F., Optimization of combined cycle power plants using evolutionary algorithms, Chemical Engineering and Processing, 46(2007), pp.1151-1159
  16. Luo, C., Huang. L., Thermodynamic parameter matching ability of geothermal flash-binary power system, J. Renewable Sustainable Energy, 6(2014), pp.1-6
  17. Wu Z., New Energy and Renewable Energy Utilization