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

在此提出的项目中，应确定并表征适合卡诺电池的工作流体。重点是天然碳氢化合物和不饱和部分卤化制冷剂的非共沸混合物。通过逆向工程方法，确定有利的混合物成分和浓度，以获得高效、不易燃和低 GWP 的工作流体。根据其可燃性、传热特性和循环性能对确定的混合物进行实验检查。主要步骤是：（1）根据逆向设计方法选择流体，（2）可燃性的预测和实验表征，（3）传热测量和识别合适的相关性，（4）子系统级别工作流体混合物的性能评估。利用现有的测试台，测量全负载和部分负载以及纯混合物和选定混合物的 ORC 系统级别的功率输出和第二定律效率。除此之外，还评估了泵和膨胀机的效率。该项目位于优先计划中，其规划方式与其他项目紧密相连。它与它们协调并交互以交付和接收结果。

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.