Share

IIR document

Organic Rankine cycle with solution circuit for low-grade waste heat recovery.

Author(s) : KRISHNA A., GROLL E. A., GARIMELLA S. V.

Summary

The use of a power generating organic Rankine cycle with solution circuit (ORCSC), also known as the absorption-Rankine cycle, for ultra low-grade heat sources was studied. The foundation for the ORCSC is the vapour compression cycle with solution circuit (VCCSC). Reversing the VCCSC creates a power-generating cycle similar in nature to the organic Rankine cycle, but with higher thermal efficiencies. The working fluid of the ORCSC is a binary mixture consisting of carbon dioxide acting as the volatile component in the vapour phase, and acetone as the solution. The mixture properties were set using the Lee-Kesler-Plöcker equation of state. Carbon dioxide has the thermodynamic advantage of a large volumetric heat capacity, which enables the use of smaller turbines. The addition of a solution circuit results in significantly lower working pressures when compared to a cycle with pure carbon dioxide. Numerical modeling has shown that the ORCSC can achieve 45 to 50% of the Carnot thermal efficiency even for source temperatures as low as 80°C. Furthermore, this system was shown to be easily adapted for a range of source and sink temperatures by adjusting the concentration of the absorbent used in the working pair.

Available documents

Format PDF

Pages: 933-942

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Organic Rankine cycle with solution circuit for low-grade waste heat recovery.
  • Record ID : 30001298
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

Links


See other articles from the proceedings (122)
See the conference proceedings

Indexing