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Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications

Title data

Popp, Tobias ; Weiß, Andreas P. ; Heberle, Florian ; Winkler, Julia ; Scharf, Rüdiger ; Weith, Theresa ; Brüggemann, Dieter:
Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications.
In: Energies. Vol. 15 (2022) Issue 1 . - No. 25.
ISSN 1996-1073
DOI: https://doi.org/10.3390/en15010025

Official URL: Volltext

Abstract in another language

Micro turbines (<100 kWel ) are commercially used as expansion machines in waste heat recovery (WHR) systems such as organic Rankine cycles (ORCs). These highly loaded turbines are generally designed for a specific parameter set, and their isentropic expansion efficiency significantly deteriorates when the mass flow rate of the WHR system deviates from the design point. However, in numerous industry processes that are potentially interesting for the implementation of a WHR process, the temperature, mass flow rate or both can fluctuate significantly, resulting in fluctuations in the WHR system as well. In such circumstances, the inlet pressure of the ORC turbine, and therefore the reversible cycle efficiency must be significantly reduced during these fluctuations. In this context, the authors developed an adaptive supersonic micro turbine for WHR applications. The variable geometry of the turbine nozzles enables an adjustment of the swallowing capacity in respect of the available mass flow rate in order to keep the upper cycle pressure constant. In this paper, an experimental test series of a WHR ORC test rig equipped with the developed adaptive supersonic micro turbine is analysed. The adaptive turbine is characterized concerning its offdesign performance and the results are compared to a reference turbine with fixed geometry. To create a fair data basis for this comparison, a digital twin of the plant based on experimental data was built. In addition to the characterization of the turbine itself, the influence of the improved pressure ratio on the energy conversion chain of the entire ORC is analysed.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 18 Jan 2022 07:55
Last Modified: 18 Jan 2022 07:55
URI: https://eref.uni-bayreuth.de/id/eprint/68398