Resumen
[0001] An energy storage system is provided. The energy storage system includes a vessel made of a refractory material and containing a phase change material, a thermally insulating cover at least partially surrounding the vessel, an emitter, made of a refractory material, having a first side arranged to be heated by the phase change material and a second side intended to radiate thermal power, at least one photovoltaic cell arranged to receive the thermal power emitted by the second side of the emitter, and electric means for heating the phase change material.
Reivindicaciones
1. An energy storage system, comprising: a vessel made of a refractory material and containing a phase change material; a thermally insulating cover at least partially surrounding the vessel; an emitter, made of a refractory material, having a first side arranged to be heated by the phase change material and a second side intended to radiate thermal power; at least one photovoltaic cell arranged to receive the thermal power emitted by the second side of the emitter; and an electric means for heating the phase change material. 2. The energy storage system according to claim 1, wherein the phase change material is selected from the group comprising: silicon, ferrosilicon, steel, copper, iron, aluminum, manganese, nickel, chromium, boron, B<4> C, Si<3> N<4> and Al<2> O<3> . 3. The energy storage system according to any of the previous claims, wherein the electric means for heating comprises a metallic coil surrounding the thermally insulating cover and means for generating an alternating electric current through the metallic coil. 4. The energy storage system according to any of the previous claims, wherein the electric means for heating the phase change material uses resistive heating to heat the phase change material. 5. The energy storage system according to claim 4, wherein the electric means for heating the phase change material comprises a plurality of resistive heaters arranged at least partially surrounding an outer wall of the vessel. 6. The energy storage system according to any of the previous claims, wherein the electric means for heating the phase change material comprises a plurality of electrodes provided within the vessel. 7. The energy storage system according to any of the previous claims, further comprising a transparent protective window provided between the emitter and the at least one photovoltaic cell. 8. The energy storage system according to any of the previous claims, wherein the emitter is cylindrical cup-shaped, the cup-shape of the emitter forming an emitter cavity that receives the at least one photovoltaic cell, wherein an outer surface of the cylindrical cup-shaped emitter is arranged to be heated by the phase change material and an inner surface of the cylindrical cup-shaped emitter is intended to radiate thermal power towards the at least one photovoltaic cell, and the vessel comprises an open hole in which the emitter is received. 9. The energy storage system according to claim 8, further comprising a plurality of photovoltaic cells provided on each side of a polyhedral-shaped photovoltaic device. 10. The energy storage system according to any of the previous claims, wherein at least part of a wall of the vessel is configured as the emitter. 11. The energy storage system according to any of the previous claims, further comprising at least one shutter located between the emitter and the at least one photovoltaic cell, such that in a closed position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is hindered and in an open position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is permitted. 12. The energy storage system according to any of claims 1-7 or 10, wherein the emitter is configured as an upper wall of the vessel, the energy storage system comprises at least one photovoltaic cell facing towards the emitter, and the energy storage system further comprises a shutter located between the emitter and the at least one photovoltaic cell, such that in a closed position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is hindered and in an open position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is permitted. 13. The energy storage system according to any of claims 1-7 or 10, wherein the emitter is located at a bottom part of the vessel, such that the phase change material is located over the emitter, the energy storage system comprises at least one photovoltaic cell facing towards the emitter, and the energy storage system further comprises a shutter located between the emitter and the at least one photovoltaic cell, such that in a closed position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is hindered and in an open position of the shutter the passage of radiation from the emitter to the at least one photovoltaic cell is permitted. 14. The energy storage system according to any of the previous claims, further comprising a mechanism to move the at least one photovoltaic cell towards or away from the emitter. 15. The energy storage system according to any of the previous claims, further comprising a conduit suitable for carrying a fluid and arranged at least partially surrounding the vessel, between the vessel and the thermally insulating cover.
