NOVELTY - The system has first heat exchanger (204) transferring heat from a working medium (206) e.g. ammonia or ammonia and water mixture, output from an energy extraction device (202) to a heating agent (232) to vaporize the agent, where the agent is selected from a group of n-Octane, n-Heptane, Butylformte, Diethylamine, Pentylamine and Pentylalcohol. Second heat exchanger (240) transfers further heat to the vaporized agent. A compressor (231) is coupled to the second exchanger to compress the further-heated agent. Third heat exchanger (211) transfers heat from the compressed agent to the medium.    USE - System for recycling thermal heat or energy of a working medium e.g. ammonia or ammonia and water mixture, output from an energy extraction device e.g. turbine such as power turbine, for a heat engine and a heat pump (all claimed) for producing mechanical work or other forms of energy in a power generation apparatus for producing electrical energy in a power plant.    ADVANTAGE - The system operates a heat engine system at a lower working medium vaporization temperature than that of a set of existing power generating plants operating on a Rankine Cycle that is mainly operated with water as the working medium, and at or even higher vapor and gas pressures of the turbine. The heat engine is operated with minimum requirement for rejection of condensation latent heat of working medium spent to an outside environment with cooling agents or can be operated without the need for rejection of condensation latent heat of a condensing step of a set of existing power cycles to the outside environment. The system improves efficiency of the heat engine and produces more work and power from the energy used to operate the power plant.    DETAILED DESCRIPTION - The compressor is a single or multi-stage compressor. The energy extraction device is a turbine i.e. power turbine. The heat exchangers are super heaters. INDEPENDENT CLAIMS are also included for the following:    (1) a method for recycling heat    (2) a method for operating a refrigeration cycle.    DESCRIPTION OF DRAWING(S) - The drawing shows a hydraulic circuit block diagram of a thermodynamic cycle and a heat engine with a single component working medium system.    Energy extraction device (202)    Heat exchangers (204, 211, 240)    Working medium (206)    Compressor (231)    Heating agent (232)