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Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Institute of Engineering Thermodynamics (LTTT), Center of Energy Technology (ZET), University of Bayreuth, Bayreuth 95440, Germany
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The original paper was presented in: Preißinger, M.; Brüggemann, D. Thermal stability of hexamethyldisiloxane (MM) for high temperature applications. Lemort, V., Quoilin, S., De Paepe, M., Van Den Broek, M., Eds. In Proceedings of the 3rd International Seminar on ORC Power Systems, ASME-ORC 2015, Brussels, Belgium, 12–14 October 2015. ISBN:978-2-9600059-2-9.
Academic Editor: Sylvain Quoilin
Energies 2016, 9(3), 183; https://doi.org/10.3390/en9030183
Received: 19 January 2016 / Revised: 25 February 2016 / Accepted: 29 February 2016 / Published: 10 March 2016
The design of efficient Organic Rankine Cycle (ORC) units for the usage of industrial waste heat at high temperatures requires direct contact evaporators without intermediate thermal oil circuits. Therefore, the thermal stability of high-temperature working fluids gains importance. In this study, the thermal degradation of hexamethyldisiloxane (MM) is investigated in an electrically heated tube. Qualitative results concerning remarks on degradation products as well as quantitative results like the annual degradation rate are presented. It is shown that MM is stable up to a temperature of 300 °C with annual degradation rates of less than 3.5%. Furthermore, the break of a silicon–carbon bond can be a main chemical reaction that influences the thermal degradation. Finally, it is discussed how the results may impact the future design of ORC units. View Full-Text
Keywords: organic Rankine cycle (ORC); thermal stability; degradation; hexamethyldisiloxane (MM); siloxane; high-temperature; waste heat recovery organic Rankine cycle (ORC); thermal stability; degradation; hexamethyldisiloxane (MM); siloxane; high-temperature; waste heat recovery
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Preißinger, M.; Brüggemann, D. Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC). Energies 2016, 9, 183.

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