Identification and characterisation of non-flammable and low-GWP fluid mixtures for thermodynamic cycles in Carnot Batteries

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In the project proposed here, working fluids suitable for Carnot Batteries shall be identified and characterized. The focus is placed on zeotropic mixtures of natural hydrocarbons and unsaturated partially halogenated refrigerants. By an inverse engineering method, favorable mixture components and concentrations are determined in order to obtain an efficient, non-flammable and low-GWP working fluid. Identified mixtures are examined experimentally according to their flammability, heat transfer characteristics and cycle performance. Main steps are: (1) the fluid selection according to the inverse design approach, (2) the prediction and experimental characterization of flammability, (3) heat transfer measurements and identification of suitable correlations, (4) a performance evaluation of the working fluid mixture on subsystem level. With an existing test rig power output and second law efficiency on ORC system level is measured for full and part load as well as for pure and selected mixtures. Next to this, pump and expander efficiency are also evaluated. Located in the Priority Programme this project is planned in a way that it is closely networked with other projects. It coordinates and interacts with them to deliver and receive results.