TY - JOUR
T1 - Material compatibility of ORC working fluids with polymers
AU - Eyerer, Sebastian
AU - Eyerer, Peter
AU - Eicheldinger, Markus
AU - Sax, Sebastian
AU - Wieland, Christoph
AU - Spliethoff, Hartmut
N1 - Publisher Copyright:
© 2017 The Author(s).
PY - 2017
Y1 - 2017
N2 - 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. 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 the material compatibility with a polyolester (POE) lubricant is also 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 determined and thus important information on chemical interaction is 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.
AB - 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. 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 the material compatibility with a polyolester (POE) lubricant is also 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 determined and thus important information on chemical interaction is 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.
KW - Organic Rankine Cycle
KW - chemical stability
KW - elastomeres
KW - hydrofluoroolefines
KW - low-GWP working fluids
KW - material compatibility
UR - http://www.scopus.com/inward/record.url?scp=85029755847&partnerID=8YFLogxK
U2 - 10.1016/j.egypro.2017.09.189
DO - 10.1016/j.egypro.2017.09.189
M3 - Conference article
AN - SCOPUS:85029755847
SN - 1876-6102
VL - 129
SP - 137
EP - 144
JO - Energy Procedia
JF - Energy Procedia
T2 - 4th International Seminar on Organic Rankine Cycle (ORC) Power Systems, ORC 2017
Y2 - 13 September 2017 through 15 September 2017
ER -