Organic Brayton Cycles with solid sorption thermal compression for low grade heat utilization

P. Dutta, P. Kumar, Kim Choon NG, S. Srinivasa Murthy*, K. Srinivasan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

While organic Rankine cycles have been widely used for power generation using low grade thermal energy, Brayton cycles have not been considered feasible because the work required to compress the gas nearly compensates the turbine work output. However, if the low grade energy can be used for thermal compression of the working fluid, it may be possible to gainfully operate the Brayton cycle. With this in mind, a solid sorption based Brayton cycle is proposed in this paper. R134a, CO2, R507a, propane, R32 and R410a with activated carbon as sorbent, were considered in this proof-of-concept study due to the ready availability of adsorption data. Even though the thermal efficiency is low (<8%), the proposed scheme could add an option for distributed power generation using solar or waste heat. It is found that if irreversibilities in turbine and thermal compression are considered R32 gives a better performance than CO2 and R410a.

Original languageEnglish (US)
Pages (from-to)171-175
Number of pages5
JournalApplied Thermal Engineering
Volume62
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Activated carbon
  • Organic Brayton Cycle (OBC)
  • Solid sorption
  • Thermal compression

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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