Friedrich Engels (1820–1895) und die europäische Sozialdemokratie

Morina C, Lehnert D. Friedrich Engels (1820–1895) und die europäische Sozialdemokratie. In: Lehnert D, Morina C, Paul-Löbe-Stiftung, eds. Friedrich Engels und die Sozialdemokratie. Werke und Wirkungen eines Europäers. Historische Demokratieforschung. Vol 18. Berlin: Metropol; In Press: 9-52

Friedrich Engels und die Sozialdemokratie. Werke und Wirkungen eines Europäers

Lehnert D, Morina C, eds. Friedrich Engels und die Sozialdemokratie. Werke und Wirkungen eines Europäers. Historische Demokratieforschung. Vol 18. Berlin: Metropol; In Press

Zweite Geige? Friedrich Engels und der Aufstieg der europäischen Sozialdemokratie (1875–1895)

Morina C. Zweite Geige? Friedrich Engels und der Aufstieg der europäischen Sozialdemokratie (1875–1895). In: Lehnert D, Morina C, eds. Friedrich Engels (1820-1895) und die Sozialdemokratie. Werke und Wirkungen eines Europäers. Historische Demokratieforschung. Vol 18. Berlin: Metropol; In Press: 149-163

Design and Experimental Investigation of a Heat Pipe supported External Cooling System for HT-PEFC stacks

A 10-cell high-temperature polymer electrolyte fuel cell (HT-PEFC) stack with an active cell area of 200 cm2 has been built up and tested with regard to the temperature distribution from cell to cell and over the active area since not every cell is cooled. Measurements with artificial reformate as a fuel show that the vertical temperature distribution over the active area is sufficiently small, with a maximum of 5.1 K at 550 mA cm−2. Additionally, the temperature gradient from cell to cell is sufficiently small with 10.7 K at 550 mA cm−2. As a result, it can be concluded that the heat pipe supported external cooling is well suited to cool HT-PEFC stacks with large active areas in reformate operation.</jats:p

Temperature distribution in a liquid-cooled HT-PEFC stack

A liquid (heat transfer oil) cooling system for high temperature polymer electrolyte fuel cell (HT-PEFC) stacks in the power range above 1 kWel using encapsulated cooling cells was designed. Calculations showed that it is sufficient to cool every third cell to maintain an operating temperature of about 160 °C. An HT-PEFC stack module including 12 cells with an active area of 320 cm2 each was assembled and tested experimentally regarding the temperature distribution from cell to cell. It was found that sufficient cooling with an oil inlet temperature of 160 °C is guaranteed up to a current density of 450 mA/cm2 when operated with synthetic reformate (42% H2, 57% N2, 1% CO). At this current density, the maximum temperature difference from cell to cell does not exceed 8.3 K. Additionally, this cooling system provided enhanced protection against leaks