US Patent 7506509 System for converting thermal to motive energy

The invention relates to a system for converting thermal to motive energy. Said system comprises at least one pressure vessel, having at least one upper injection orifice for a warm and/or cold fluid, and at least one liquid piston pump inside the pressure vessel which is coupled with a working cycle. The pressure vessel has a horizontal partition that is provided with a bore. Above said partition, a gas or gas mixture is present, and below the partition, the liquid piston pump is located.