Abstract: The invention provides a method and apparatus for recovering work from a heat source and providing a cooling source that comprises: a. providing a selected working fluid comprising at least two components; to a first low pressure pump; b. feeding the selected working fluid to a dividing means; c. dividing the working fluid into a first stream and a second stream, d. feeding the first stream at a first low pressure to a first heat transfer zone to transfer heat to the working fluid stream heating the stream to a higher temperature, e. feeding the higher temperature stream to a separation means, f. separating a volatile component enriched stream and a volatile component depleted stream; g. heating the volatile component enriched stream; h. feeding the volatile component enriched stream to an expansion means i. expanding the volatile component enriched stream to a lower temperature and pressure; j.