NOVELTY - The heat energy conversion system has descent pipes (21) with liquid column of cycle fluid (20), comprising fanned condenser (17) and heat insulated anti-freeze fluid tanks (19) to collect and store the coolness of night at high elevation. The heat exchangers (13) provide for heat reclamation to obtain cycle efficiency from hot vapor. The hydraulic engine generates mechanical energy from high pressure of fluid, and an electrical generator converts the mechanical energy and completes the reversible cycle.    USE - Heat energy conversion system for collecting idle heat energies in natural environments such as sun, sea, air, mountains, and plains, storing them, and converting them into uninterrupted electrical energy.    ADVANTAGE - The thermal energies can be collected from natural heat sources like sun, with large quantities. Large quantities of thermal energies can be stored as latent heat at ambient temperatures, using inexpensive chemical materials like paraffin. All natural environments such as plains, mountains, hills, sun, sea, air, geothermal, etc., can be used as thermal energy sources, depending on the regions. Simple sun collectors can be used for producing hot water. All kinds of different natural heat energy sources with temperature gradients smaller than 80 degrees C can used. Electrical energy can be generated efficiently from these small temperature gradients with thermodynamic cycles. The system can be built easily and at low cost of investment. The electrical energy can be generated uninterruptedly even during the night by using large amounts of reserved solar heat energies. The service life of the system can be improved with silent operation. The maintenance costs can be reduced, and production of greenhouse gasses is prevented. Electrical energy can be produced from renewable energy sources.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the heat energy conversion system including two exchanger installations.    Heat exchanger (13)    Fanned condenser (17)    Anti-freeze fluid tank (19)    Cycle fluid (20)    Descent pipe (21)