Airbus Defence and Space Gmbh

Dornier Gmbh

Airbus Ds Gmbh

Joerg Heitzer

Richard Spaeh

Reinhold Schamm

Klaus-Peter Zurell

Edmund Wegmann

A method for computing self-contamination processes of a spacecraft involves receiving a first set of input parameters comprising general definitions of the spacecraft, and a second set of input parameters comprising control parameters for the spacecraft orbital data, physics, numeric. A self-contamination process of the spacecraft is calculated based on the received first and second sets of input data by calculating an analytical solution of a basic equation for calculating a deposit of molecules outgassed from surfaces of the spacecraft in a single computation step with the data processing device. The calculated deposit of molecules is then output.

Method for computing self-contamination processes of a spacecraft

A method for computing self-contamination processes of a spacecraft by means of a data processing device comprising the following steps: receiving a first set of input parameters comprising general definitions of the spacecraft, receiving a second set of input parameters comprising control parameters for the spacecraft orbital data, physics, numeric, and a predetermined accuracy requirement of the computation, computing a self-contamination process of the spacecraft based on the received first and second sets of input data by either evaluating the analytical solution of a basic equation of emission or numerically solving the basic equation of emission for calculating a deposit of molecules outgassed from surfaces of the spacecraft with a numerical solver with the data processing device, wherein the numerical solver applies an adaptive stepsize control based on the preset accuracy requirement of the computation, and outputting the calculated deposit.

The invention provides a fuel cell arrangement with a plurality of fuel cell stacks which are stacked on top of one another and are enclosed in a sealed exterior housing. Supply air is freely guided to the fuel cell stacks within the enclosure, while combustion gas is provided to the respective stacks by means of pipes. A plurality of flat seals are provided between adjacent fuel cell stacks, each having a central air opening and a separate peripheral combustion gas channel. The lowermost fuel stack is mounted by means of such a seal, on a base plate into which a collective channel for exhaust air and a channel for combustion gas are integrated.

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Immenstaad, Germany

Joerg Heitzer