NOVELTY - An alternator (120) coupled to turbine shaft (116) converts rotational energy of turbine shaft to electrical energy. A second heat exchanger (126) and a condensing unit (134) coupled to a turbine unit (114) and to first heat exchanger ((102) receive working fluid from the turbine unit at fifth temperature, cools fluid, and supplies cooled fluid to the first heat exchanger at third temperature.    USE - For extracting energy from source of waste heat, such as hot waste fluid from small industrial installations, automotive combustion engines.    ADVANTAGE - Compact in scale, capable of extracting energy from relatively low temperature sources, can recover energy at reasonable efficiency from sources of heat that will otherwise be wasted, or from renewable sources.    DETAILED DESCRIPTION - The first heat exchanger receives source fluid, incorporating the waste heat, at first temperature and outputs waste fluid at second temperature, and receives the working fluid at third temperature and outputs the working fluid at fourth temperature. The fourth temperature is higher than the third temperature and higher than the boiling point of working fluid. The turbine unit is arranged to receive working fluid output from the first heat exchanger at first pressure and outputs working fluid at second pressure. The second pressure is lower than the first pressure. The turbine unit imparts rotational energy to the turbine shaft mounted within the turbine unit. INDEPENDENT CLAIMS are also included for the following:    (a) the use of HFE-7100 or hexane or water as working fluid and/or lubrication fluid in energy recovery system; and    (b) the use of one of alkane as working fluid and/or lubrication fluid in energy recovery system.    DESCRIPTION OF DRAWING(S) - The figure is the schematic diagram of the energy recovery system.    Turbine unit (114)    Turbine shaft (116)    Alternator (120)    Second heat exchanger (126)    Condensing unit (134)    First heat exchanger (102)