Thermal Stability and Thermodynamic Performances of Pure Siloxanes and Their Mixtures in Organic Rankine Cycles

Gioele Di Marcoberardino, Costante Mario Invernizzi, Paolo Iora, Luca Arosio, Marcello Canavese, Angelo Lunghi and Antonella Mazzei
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Gioele Di Marcoberardino: Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
Costante Mario Invernizzi: Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
Paolo Iora: Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
Luca Arosio: NNOVHUB Stazioni Sperimentali per l’Industria, Via Galileo Galilei, 20097 San Donato Milanese, Italy
Marcello Canavese: NNOVHUB Stazioni Sperimentali per l’Industria, Via Galileo Galilei, 20097 San Donato Milanese, Italy
Angelo Lunghi: NNOVHUB Stazioni Sperimentali per l’Industria, Via Galileo Galilei, 20097 San Donato Milanese, Italy
Antonella Mazzei: NNOVHUB Stazioni Sperimentali per l’Industria, Via Galileo Galilei, 20097 San Donato Milanese, Italy

Energies, 2022, vol. 15, issue 10, 1-20

Abstract: Organic Rankine cycles are often the best solution for the conversion of thermal energy. The many working fluids include silicon oils. One crucial issue that determines the choice of a working fluid is its thermochemical stability, as this sets a limit to the maximum temperature at which the fluid can be used in a power plant. A second subject, much debated today, is the use of mixtures in ORCs. In the first part of this study, an investigation into the thermal stability of siloxanes using two different approaches was carried out. The results confirmed a limit working temperature for the considered siloxanes of about 300 °C, with a degradation that advanced significantly over time at 350 °C. In the second part of the study, an analysis of the thermodynamic performances of some siloxane mixtures was carried out. It was found that the efficiencies of the corresponding thermodynamic cycles were substantially the same as for the pure fluids used today. By changing the composition of the mixture, it was also possible to vary, within reasonable limits, the values of the condensation pressure, adapting the thermodynamic cycle to the different situations that can be encountered in current practice.

Keywords: organic Rankine cycles (ORC); thermal stability; siloxanes; mixture of fluids (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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