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Methods and systems are disclosed for generating power though the use of thermodynamic engines and low-temperature liquids. A liquid cryogen maintains a temperature differential with a heat source across a thermodynamic engine. The thermodynamic engine is run to convert heat provided in the form of

Methods and systems are disclosed for generating power though the use of thermodynamic engines and low-temperature liquids. A liquid cryogen maintains a temperature differential with a heat source across a thermodynamic engine. The thermodynamic engine is run to convert heat provided in the form of the temperature differential to a nonheat form of energy. Cryogen vapor produced by vaporization of the liquid cryogen is collected and combusted to generate additional energy.

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What is claimed is: 1. A method of generating power, the method comprising: providing a liquid cryogen in thermal communication with a thermodynamic engine to maintain a temperature differential across the thermodynamic engine with a heat source; running the thermodynamic engine to convert heat pro

What is claimed is: 1. A method of generating power, the method comprising: providing a liquid cryogen in thermal communication with a thermodynamic engine to maintain a temperature differential across the thermodynamic engine with a heat source; running the thermodynamic engine to convert heat provided in the form of the temperature differential to a nonheat form of energy; collecting cryogen-vapor produced by vaporization of the liquid cryogen; and combusting the cryogen vapor to generate additional energy. 2. The method recited in claim 1 wherein the heat source comprises an ambient environment within which the thermodynamic engine is disposed. 3. The method recited in claim 1 wherein combusting the cryogen vapor comprises producing heat in thermal communication with the heat source to enhance the temperature differential across the thermodynamic engine. 4. The method recited in claim 1 wherein the heat source comprises waste heat produced by a secondary power-generation method. 5. The method recited in claim 1 wherein the liquid cryogen has a boiling point less than-150° C. 6. The method recited in claim 1 wherein the liquid cryogen is selected from the group consisting of liquid nitrogen, liquid neon, liquid helium, liquid hydrogen, liquid carbon monoxide, liquid argon, and liquid krypton. 7. The method recited in claim 1 wherein the thermodynamic engine comprises a Stirling engine and the nonheat form of energy comprises mechanical energy. 8. The method recited in claim 1 wherein the thermodynamic engine comprises a thermoelectric engine and the nonheat form of energy comprises electrical energy. 9. The method recited in claim 1 further comprising replenishing the cryogen source. 10. The method recited in claim 9 wherein: combusting the cryogen vapor comprises oxidizing the cryogen vapor to produce a cryogen oxide; and replenishing the cryogen source comprises electrolyzing the cryogen oxide. 11. The method recited in claim 1 wherein running the thermodynamic engine comprises operating a Rankine engine by generating vapor from a liquid with the heat source and condensing the vapor with the liquid cryogen. 12. A method of generating power, the method comprising: providing a Stirling engine in an ambient environment; providing liquid hydrogen in thermal communication with the Stirling engine to maintain a temperature differential across the Stirling engine with the ambient environment; running the Stirling engine to convert heat represented by the temperature differential into mechanical energy; collecting hydrogen vapor produced by vaporization of the liquid hydrogen; oxidizing the hydrogen vapor to generate additional energy; and providing heat generated by oxidizing the hydrogen vapor to a portion of the Stirling engine to enhance the temperature differential across the Stirling engine. 13. The method recited in claim 12 further comprising providing waste heat generated from a secondary power-generation method to a portion of the Stirling engine to further enhance the temperature differential across the Stirling engine. 14. A system for generating power, the system comprising: a thermodynamic engine configured to convert heat provided in the form of a temperature differential to a nonheat form of energy; a liquid-cryogen source containing liquid cryogen in thermal communication with the thermodynamic engine to maintain the temperature differential across the thermodynamic engine with a heat source; and a combustion unit disposed to collect cryogen vapor produced by vaporization of the liquid cryogen and to combust the cryogen vapor to generate additional energy. 15. The system recited in claim 14 wherein the heat source comprises an ambient environment within which the thermodynamic engine is disposed. 16. The system recited in claim 14 wherein the combustion unit is further disposed to provide heat generated by combustion of the cryogen vapor in thermal communication with the heat source to enhance the temperature differential across the thermodynamic engine. 17. The system recited in claim 14 further comprising a secondary power-generation system, wherein the heat source comprises waste heat produced by the secondary power-generation system. 18. The system recited in claim 14 wherein the liquid cryogen has a boiling point less than-150° C. 19. The system recited in claim 14 wherein the liquid-cryogen source is selected from the group consisting of a liquid-nitrogen source, a liquid-neon source, a liquid-helium source, a liquid-hydrogen source, a liquid-carbon-monoxide source, a liquid-argon source, and a liquid-krypton source. 20. The system recited in claim 14 wherein the thermodynamic engine comprises a Stirling engine and the nonheat form of energy comprises mechanical energy. 21. The system recited in claim 14 wherein the thermodynamic engine comprises a thermoelectric engine and the nonheat form of energy comprises electrical energy. 22. A system for generating power, the system comprising: means for converting heat provided in the form of a temperature differential to a nonheat form of energy; means for maintaining the temperature differential with a heat source across the means for converting heat using a liquid cryogen; and means for combusting cryogen vapor produced by vaporization of the liquid cryogen to generate additional energy. 23. The system recited in claim 22 wherein the means for combusting cryogen vapor comprises means for producing heat in thermal communication with the heat source to enhance the temperature differential across the means for converting heat. 24. The system recited in claim 22 further comprising a secondary means for generating power, wherein the heat source comprises waste heat produced by the secondary means for generating power.