ZeoPTES: Zeotropic Pumped Thermal Energy Storage with an Ammonia–Water Mixture as Working Fluid

The rapid rise of renewable energy production necessitates the development largescale electricity storage systems. Pumped thermal (PTES), where is stored in hot and cold units, has recently garnered a lot interest. Previously proposed PTES systems rely on pure fluids as working Brayton- or Rankine-based power cycles. Herein, ZeoPTES, system using zeotropic mixture ammonia water fluid, introduced. exhibits nonisothermal evaporation condensation, which allows utilization industrially available sensible like molten salt, to store from these phase changes. A simulation REFPROP 10.0 database written analyze cycle. Eight parameters are identified having an effect round-trip efficiency 30 000 simulations with random values for run identify impact all. Although efficient compressors expanders necessary reach high power-to-power efficiency, largest systemwide losses arise entropy generation stream mismatch side heat exchangers. Using state-of-the-art microchannel exchangers extremely low pinch points efficiencies excess 70%.