Abstract:
This invention is directed to transferring heat from an extremely high temperature source to an electrically isolated lower temperature receiver. The invention is particularly concerned with supplying thermal power to a thermionic converter from a nuclear reactor with electric isolation.Heat from a high temperature heat pipe (10) is transferred through a vacuum or a gap filled with electrically nonconducting gas (26) to a cooler heat pipe (18). The heat pipe (10) is used to cool the nuclear reactor while the heat pipe (18) is connected thermally and electrically to a thermionic converter (22).If the receiver requires greater thermal power density, geometries are used with larger heat pipe areas for transmitting and receiving energy than the area for conducting the heat to the thermionic converter. In this way the heat pipe capability for increasing thermal power densities compensates for the comparatively low thermal power densities through the electrically non-conducting gap between the two heat pipes.
Abstract:
A laser excited thermionic electric converter is disclosed wherein an externally located heat source causes electrons to be boiled off an electron emissive surface interiorly positioned on one end wall of an evacuated cylindrical chamber. A grid having a small negative potential traps the electron flow and the mass of electrons is then exposed to a laser pulse discharge and at the same time the potential on the grid is removed to permit a bolus of electrons to flow therethrough. The electron bolus is electrically focused and accelerated through the interior of an air core induction coil located within a transverse magnetic field, and subsequently is collected on the other end wall of the chamber functioning as a collecting plate. The EMF generated in the induction coil by action of the transiting electron bolus interacting with the transverse magnetic field is applied to an external circuit to perform work.
Abstract:
Direct conversion systems for in situ conversion of geothermal energy into electricity are described in which thermoelectric generators and/or thermionic convertors directly convert the earth's thermal energy into electrical energy. The choice of a thermoelectric or thermionic system is dictated by the temperature domain of the particular geothermal formation.The basic unit of the described system includes at least two coaxially-intersecting heat pipes, extending between a high temperature geological strata and a low temperature geological strata. Thermal-electric energy conversion devices are positioned within an annulus between the intersecting heat pipes.
Abstract:
A pool of liquid cesium is spaced apart from a collector in an enclosed vessel. A laser beam is directed to the liquid cesium pool. The beam is focused to provide sufficient laser power density at the liquid cesium surface to vaporize some of the liquid cesium and ionize the vaporized cesium, and thereby form cesium ions and free electrons. The work function of the collector is different from that of cesium. When the work function is higher, the formed ions are attracted to the collector and the electrons are attracted by the liquid cesium, while the electrons and ions are respectively attracted by the collector and liquid cesium respectively when the work function of the collector is less than that of cesium. Thus, a potential difference is generated by the liquid cesium pool and the collector, sufficient to apply electric power to a load. The collector is held at a higher temperature than the liquid cesium to repel any neutralized cesium ions at the collector surface and any vaporized cesium atoms which are not ionized by the laser beam from the collector in order to facilitate the flow of ions or electrons thereto.
Abstract:
Low temperature radioisotopic thermionic converter having a construction wherein the converter adsorption area to vapor volume ratio is sufficiently high at the converter''s operating pressure to achieve an area-dominated adsorption effect structure, is processed by first refluxing cesium at high collector temperature and high vapor pressure in the converter to purge remanent reactive impurities therein and then establishing the loci of converter maximum power versus cesium reservoir temperature for respectively different collector temperatures to allow adjustment of the converter at optimum cesium pressure and optimum collector temperature before sealing. Cesiation apparatus for batch-charging of a plurality of converters from a common cesium supply source includes a heated cesium reservoir container for enclosing the converters therein, and a collector heater, emitter and collector connection leads, and a means of sealing each converter at each converter position.
Abstract:
A thermoelectric converter diode in which the thermal energy required for the heating of the ionisable fluid which fills the space between the emitter and the collector is taken from the collector by conduction and from the emitter by radiation. To this end the ionizable substance is stored in a block having a large surface-to-volume ratio, which block is supported by the collector within the diode.
Abstract:
A system for temperature stabilization through the use of a heat pipe, that zone of the heat pipe which is remote from the heating zone having an inert gas plug whose volume varies with the vapour pressure of the heat vehicle. The plug effects variation in the heat pipe wall area actually radiating heat according to changes in the volume of the plug, and includes a secondary heat pipe which is in good thermal connection with that part of the first heat pipe where the inert gas plug is disposed.
Abstract:
A heat pipe is provided with a noncondensible gas reservoir at the condenser end. The pressure of the gas and the size of the reservoir are selected to prevent a large change in the operating pressure, and thus the operating temperature, if the heat input to the heat pipe decreases.
Abstract:
THIS INVENTION RELATES TO THERMIONIC FUEL ELEMENTS, PROVIDED WITH NUCLEAR FUEL, FOR DIRECT CONVERSION INTO ELECTRICAL ENERGY OF HEAT PRODUCED BY NUCLEAR FISSION. THE THERMIONIC ELEMENTS COMPRISE TUBULAR, CONCENTRICALLY POSITIONED EMITTERS (1) THE COLLECTORS (4). THE FUEL ELEMENTS ARE ELECTRICALLY CONNECTED IN SERIES AND ARE PROVIDED WITH RESPECTIVE DISCHARGE CHAMBERS (5) WHICH ARE SEPARATED FROM EACH OTHER BY NOVEL VACUUM-TIGHT SEALS, THE SEALS PROVIDING A MECHANICAL AND ELECTRICAL SEPARTION OF THE RESPECTIVE THERMIONIC ELEMENTS. THE DISCHARGE CHAMBER, PROFICED AT ONE END OF EACH THERMIONIC ELEMENT, IS FILLED WITH CESIUM VAPOR. THE NOVEL SEAL COMPRISES A DISCSHAPED RIGID METAL-CERAMIC COMPONENT (6,7) AT ONE END, AND A PLIABLE OR YIELDABLE METAL-CERAMIC PORTION ACTING AS A GUIDE RING (10,11) AT THE OTHER END, ACTING IN COMBINATION WITH A VACUUM-TIGHT PLATE (9).