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- Title:
Thermodynamic evaluation of an ORC test rig - from comprehensive experimental results to a simulation model
- Document type:
- Konferenzbeitrag
- Author(s):
- Tobias Popp; Florian Heberle; Andreas P. Weiß; Dieter Brüggemann
- Abstract:
- Organic Rankine Cycle (ORC) systems are a widespread technology for recovering the waste heat of low to medium temperature energy sources. Despite the fact that they are commercially used in a wide range of applications, the data situation concerning the thermodynamic performance of the different components of those plants is rather poor, especially regarding part-load operation. In the scope of the present paper, comprehensive experimental results of an ORC test rig with hexamethyldisiloxane (MM) as working fluid and a Quasi-Impulse Cantilever turbine as expansion machine are presented. For preheating, evaporating and superheating the working fluid, a Plate & Shell heat exchanger was applied. Exhaust gas from a propane gas burner served the test rig as heat source. At design point, MM was evaporated at a pressure level of 6 bar. By expanding the working fluid to 0.32 bar, an electrical power output of approx. 12 kW was generated. All main components of the cycle, i.e. heat exchangers, feed pump and turbine, were analyzed concerning their thermodynamic operational behavior. Part-load operating points down to 50% of the ORC design mass flow rate were considered. Due to the fixed swallowing capacity of the used turbine, a decrease in mass flow rate was always associated with a drop of the evaporation pressure of the cycle. Experimental results for each component of the ORC system were analyzed. The corresponding off-design characteristics were implemented in a commercial cycle modelling tool for quasi-stationary simulations. Hence, a digital twin of the experimental test rig was provided. In this simulation model, it could be shown that WHR efficiency at 50% design mass flow rate could be improved from 4.6% to 7.2% by substituting the fixed geometry turbine by one with adjustable swallowing capacity.
- Editor:
- Technical University of Munich
- Book / Congress title:
- Proceedings of the 6th International Seminar on ORC Power Systems
- Organization:
- Technical University of Munich
- Date of congress:
- 11.10.2021-13.10.2021
- Publisher:
- Technical University of Munich
- Year:
- 2021
- Year / month:
- 2021-10
- E-ISBN:
- 978-3-00-070686-8
- Bookseries ISSN:
- 2709-7609
- Reviewed:
- ja
- Language:
- en
- Publication format:
- WWW
- Fulltext / DOI:
- doi:10.14459/2021mp1632936
- CC license:
- by-sa, http://creativecommons.org/licenses/by-sa/4.0
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