Abstract: The present invention relates to a device for energy conversion, comprising: a housing provided with at least one chamber and a piston which is freely movable within said chamber, wherein said piston is capable of reciprocating movement from a central position or rest position, and wherein a gap between the piston and the wall of the chamber has a dimension that decreases as the piston moves further away from said central position or rest position.

Abstract: A low-temperature fuel cell assembly including of a low-temperature fuel cell (1) in combination with a sweeping gas circuit (2) for at least the anode part thereof. The fuel gas is prepared by filtering via a semi-permeable wall (5) and the yield from this process is increased by employing sweeping gas. This sweeping gas is obtained by producing it in the sweeping gas circuit (2). During operation some of the sweeping gas is continuously discharged and fresh sweeping gas is continuously produced. With this arrangement it is possible to use hydrogen as fuel gas. Sweeping gas is obtained by injecting air (8) and combusting (9) the oxygen contained therein with hydrogen. It is also possible to perform a methanisation reaction starting from hydrogen as fuel gas by providing CO/CO2 as a result of which the sweeping gas is methane.

Abstract: Low-temperature fuel cell assembly consisting of a low-temperature fuel cell in combination with a sweeping gas circuit for at least the anode part thereof. The fuel gas is prepared by filtering via a semi-permeable wall and the yield from this process is increased by employing sweeping gas. This sweeping gas is obtained by producing it in the sweeping gas circuit. During operation some of the sweeping gas is continuously discharged and fresh sweeping gas is continuously produced. With this arrangement it is possible to use hydrogen as fuel gas. Sweeping gas is obtained by injecting air and combusting the oxygen contained therein with hydrogen, It is also possible to perform a methanisation reaction starting from hydrogen as fuel gas. by providing CO/CO2, as a result of which the sweeping gas is methane.