NOVELTY - Electrodes (1,2) are connected through a potential barrier (3) with height and width in such a way that electrons with bigger kinetic energy from the first electrode pass predominantly through the potential barrier, and get into the second electrode and create potential difference between the electrodes. When a current created in consequence of the potential difference flows across an external electrode, the electrodes and potential barrier cool and consume thermal energy from an external source of thermal energy.    USE - For generating electric energy by conversion of thermal energy into electric energy and electric energy into thermal energy, and without the need to create outside temperature difference.    ADVANTAGE - Permits two modes of operation, in which the production of electric energy and cooling are permitted and conversion of electric energy into thermal energy are permitted. Permits reversibility, conversion of thermal energy into electric energy and electric energy into thermal energy. Permits easy realization of battery of serial, parallel or mixed connected devices in one common corpus. Process of energy conversion would not require two different temperatures, and conversion is possible at lower operating temperatures of the device.    DETAILED DESCRIPTION - The energy is electrically transmitted to the external electric load. When a current from an external source of electric energy flows against the potential difference, thermal energy, which is received from the external source of electric energy is released in the electrodes and potential barrier, and transmitted thermally to an external consumer of thermal energy. An INDEPENDENT CLAIM is also included for an energy conversion device.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic illustration of the device for conversion of thermal energy into electric energy and electric energy into thermal energy.    Electrodes (1,2)    Potential barrier (3)    Corpus (4)    Conductor (5)    Output terminal (6)