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Advanced Low Pressure Cycle for Concentrated Solar Power Generation

[+] Author Affiliations
Pardeep Garg, Sriram Hebbalguppe Krishna, Pramod Kumar

Indian Institute of Science, Bangalore, Bangalore, KA, India

Thomas Conboy, Clifford Ho

Sandia National Laboratories, Albuquerque, NM

Paper No. ES2014-6545, pp. V001T02A033; 10 pages
  • ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology
  • Volume 1: Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power, Solar Thermochemistry and Thermal Energy Storage; Geothermal, Ocean, and Emerging Energy Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Photovoltaics; Wind Energy Systems and Technologies
  • Boston, Massachusetts, USA, June 30–July 2, 2014
  • Conference Sponsors: Advanced Energy Systems Division
  • ISBN: 978-0-7918-4586-8
  • Copyright © 2014 by ASME


Turbine inlet pressures of ∼ 300 bar in case of CO2 based cycles call for redesigning the cycle in such a way that the optimum high side pressures are restricted to the discharge pressure limits imposed by currently available commercial compressors (∼150 bar) for distributed power generation. This leads to a cycle which is a combination of a transcritical condensing and a subcritical cycle with an intercooler and a bifurcation system in it. Using a realistic thermodynamic model, it is predicted that the cycle with the working fluid as a non-flammable mixture of 48.5 % propane and rest CO2 delivers ∼37.2 % efficiency at 873 K with a high and a low side pressure of 150 and 26 bar respectively. This is in contrast to the best efficiency of ∼36.1 % offered by a transcritical condensing cycle with the same working fluid at a high side pressure of ∼ 300 bar.

Copyright © 2014 by ASME



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