Modellierung und Dimensionierung eines Systems zur Strom-, Wärme- und Kälteerzeugung auf Basis einer PEM Brennstoffzelle

Kurzfassung

Fuel Cells generate electrical energy and thermal energy in form of waste heat. The use of this waste heat is necessary for an efficient operation. Various process combinations are possible depending on the temperature level. One possibility is the combination of a PEM fuel cell and the DEC process (Desiccative Evaporation Cooling). This air cooling process is based on the principle of desiccation and evaporation. The DEC units require a relatively low temperature level and pure water for operation, which both are delivered by the PEM fuel cell. In this thesis, a model for a coupled system is created with the program EES. Furthermore, the system is calculated at stationary operating states and typical climate conditions. Based on of these results, a DEC unit is designed for a specific case. The total volume and total weight of the DEC unit is established. On the basis of the design results, optimization possibilities on the overall system are shown and further possible applications are discussed.