High-potential Working Fluids for Next Generation Binary Cycle Geothermal Power Plants

Abstract

Cyclopentene is not recommended for use in an ORC system at relatively high temperatures. At lower temepratures, other fluids are considered. R245fa (1,1,1,3,3-Pentafluoropropane) is a fluid with promising performance, but its environmental impact is a concern. An alternative to R245fa is the new vendor fluid. The fluid has similar or slightly better thermodynamic performance than R245fa, but a lot lower global warming and ozone depletion potential. Therefore, it is the target of this section to investigate its thermal stability as a working fluid of ORC and supercritical ORC at temperatures around 200 C and pressures greater than its critical pressure of ~ 40 bar.