Spirax Sarco, Inc.

Obadah Zaher

Jeremy Miller

There is disclosed a heat enginecomprising: a heat exchangerto transfer heat from a heat sourceto a working fluid; a positive displacement expanderconfigured to receive inlet working fluid from the heat exchangerand discharge expanded working fluid as a multiphase fluid so that there is an overall volumetric expansion ratio between the expanded working fluid and the inlet working fluid which is a function of an inlet dryness of the inlet working fluid; a variable expansion valvedisposed between the heat exchangerand the expander, the valve being configured to introduce a variable pressure drop in the working fluid to vary the inlet dryness; and a controllerconfigured to maintain the overall volumetric expansion ratio by controlling the valveto compensate for variable heat transfer to or from the working fluid.

Heat engine

A pumping apparatus for a heat engine, includes an extraction line arranged to extract a fraction of liquid working fluid from a working circuit of a heat engine; an extraction line pump for pumping the extracted working fluid; an extraction line heat exchanger for vaporising the extracted working fluid; and a pressure-operated pump for pumping the working fluid around the working circuit, wherein the extraction line pump and the extraction line heat exchanger are arranged in series to convert the liquid working fluid to a pressurised motive gas; and wherein the pump is driven by the pressurized motive gas.

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Cheltenham, United Kingdom

Obadah Zaher