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14:40
20 mins
Material compatibility of ORC working fluids with polymeres
Sebastian Eyerer, Peter Eyerer, Markus Eicheldinger, Sebastian Sax, Christoph Wieland, Hartmut Spliethoff
Session: Session 2C: Working Fluid Selection
Session starts: Wednesday 13 September, 14:20
Presentation starts: 14:40
Room: Building 27 - Lecture room 03


Sebastian Eyerer (Technical University of Munich, Institute for Energy Systems)
Peter Eyerer (Fraunhofer Institute for Chemical Technology )
Markus Eicheldinger (Technical University of Munich, Institute for Energy Systems)
Sebastian Sax (Technical University of Munich, Institute for Energy Systems)
Christoph Wieland (Technical University of Munich, Institute for Energy Systems)
Hartmut Spliethoff (Technical University of Munich, Institute for Energy Systems)


Abstract:
In this study, the material compatibility of refrigerants focusing on hydrofluoroolefines (HFO) with typical polymers in ORC plants and refrigeration units is analyzed with consistent testing conditions and a complete uncertainty analysis of the results. Therefore, one state-of-the-art refrigerant, namely R245fa, as well as the low-GWP fluids R1233zd-E and R1234yf are taken into account. The investigated polymers are ethylene-propylene-diene rubber (EPDM), fluoric rubber (FKM) and polytetrafluoroethylene (PTFE). In the case of EPDM, two different compositions are analyzed. To complement the study also the material compatibility with a polyolester (POE) lubricant is investigated. The material compatibility is evaluated by changes in volume, weight, Shore A as well as in small load hardness. With the small load hardness measurements, the hardness directly at the samples surface can be evaluated and thus important information on chemical interaction are provided. This study points out the importance of material compatibility testing especially investigating the difference between hydrofluorocarbons (HFC) and HFO, because the unsaturated characteristic of the HFO may lead to considerable changes in material compatibility compared to HFC refrigerants.