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Investigation of Performance Enhancements for Air Brayton/ORC Combined Cycles for Small (~ 2 MWe) Power Systems and a Moderate Heat Source Temperature

  • Joseph Litrel
  • Donna Post Guillen
  • Michael McKellar
Computational Approaches for Energy Materials and Processes
  • 9 Downloads

Abstract

Attractive power generation cycles from economic and sustainability considerations are highly efficient and require minimal cooling water. Air Brayton cycles (ABCs) require no cooling water; however, air Brayton combined cycles (ABCCs), which require a minimal water, are more efficient. Several ABCs and ABCCs designed to operate at 5 MWth (~ 2 MWe) were evaluated in temperate environments with a constant temperature heat source at 650°C. An Organic Rankine cycle (ORC) operating with r143a was selected for the bottoming cycle based on previous analyses. Efficiency can increase from 22.0% in the standard ABC to 39.8% in the ABCC. Various performance enhancements were explored, including air inlet cooling, ORC regeneration, and ORC reheat. For the recuperated ABCC with evaporative cooling, the capital cost is < US$17M and the payback period is < 13 years. The major exergy losses are 56.4% spent as work at the ABC turbine and 23.5% lost at the heat source.

Notes

Acknowledgements

This manuscript was authored by Battelle Energy Alliance, LLC, under Contract No. DE-AC07-05-ID14517 with the U.S. Department of Energy. Support for Joseph Litrel was provided by the U.S. DOE Office of Science, Office of Workforce Development for Teachers and Scientists under the SULI program. Funding for Michael McKellar was provided by the Center for Advanced Energy Studies Visiting Summer Faculty Program. Donna Guillen wishes to thank Gabriel Ilevbare of Idaho National Laboratory for providing support for this work.

Supplementary material

11837_2018_3257_MOESM1_ESM.pdf (373 kb)
Supplementary material 1 (PDF 373 kb)

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Copyright information

© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2018

Authors and Affiliations

  • Joseph Litrel
    • 1
  • Donna Post Guillen
    • 2
  • Michael McKellar
    • 3
  1. 1.Georgia Institute of TechnologyAtlantaUSA
  2. 2.Idaho National LaboratoryIdaho FallsUSA
  3. 3.University of Idaho - Idaho FallsIdaho FallsUSA

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