FIELD: heat power engineering; energy conversion. SUBSTANCE: invention relates to method using working medium for creating useful work from heat of external source. Method includes interaction of working medium with energy source and interaction of working medium with additional low-temperature energy source, Direct positron state of matter being used as low-temperature energy source. Interaction is effected by bringing working medium into quantum-mechanical resonance with said state. Method makes it possible to convert thermal energy into useful work at efficiency near theoretical value using deep-seated thermal processes in working medium without technically complicated energy regeneration systems and enlarged types of useful work at realization of method. EFFECT: provision of high efficiency of process. 3 cl, 1 dwg
