Energy conversion efficiency of thermoelectric power generation utilizing convective heat flow

• US 20020148235A1
• Filed: 07/31/2001
• Published: 10/17/2002
• Est. Priority Date: 02/09/2001
• Status: Active Grant

• Current Assignee: Gentherm Incorporated
• Original Assignee: BSST, Inc.
• Inventors: Bell, Lon E.
• Granted Patent: US 6,598,405 B2
• Time in Patent Office: Days
• US Class Current: 62/3.3
• CPC Class Codes: F02G 1/043 the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
• CPC Class Codes: F02G 2254/11 Catalytic burners
• CPC Class Codes: F25B 21/02 using Peltier effect; using Nernst-Ettinghausen effect
• CPC Class Codes: F25B 2321/021 Control thereof
• CPC Class Codes: F25B 27/02 using waste heat, e.g. from internal-combustion engines
• CPC Class Codes: F25B 33/00 Boilers; Analysers; Rectifiers boiler-absorbers F25B35/00
• CPC Class Codes: H10N 10/00 Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects integrated devices or assemblies of multiple devices H10N19/00
• CPC Class Codes: H10N 10/13 characterised by the heat-exchanging means at the junction
• CPC Class Codes: H10N 10/17 characterised by the structure or configuration of the cell or thermocouple forming the device
• CPC Class Codes: Y02A 30/274 using waste energy, e.g. from internal combustion engine
• CPC Class Codes: Y02E 20/14 Combined heat and power generation [CHP]
• CPC Class Codes: Y02P 80/15 On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

An improved efficiency thermoelectric power generation system is disclosed wherein convection is actively facilitated through a thermoelectric array, and the thermoelectric array is used to generate electrical power. Thermal power is convected through the thermoelectric array or arrays toward at least one side of the thermoelectric array, which leads to increased efficiency. Thermal power is applied to the array, creating a temperature gradient across the array. The thermoelectric system may also be combined with other power generation systems, forming a co-generation system.

Claims

1. A thermoelectric power generator system comprising:

A plurality of thermoelectric elements forming at least one thermoelectric array with at least one first side and at least one second side exhibiting a temperature gradient between them during operation, wherein at least a portion of the at least one thermoelectric array is configured to permit generally steady-state convective heat transport toward at least one side of at least a portion of the thermoelectric array.

2. The thermoelectric power generator of claim 1, wherein at least one convective medium flows through the at least a portion of the array to provide the generally steady-state convective heat transport, wherein the at least one convective medium flows generally from the at least one first side to the at least one second side.

3. The thermoelectric power generator of claim 2, wherein the at least one convective medium flows along at least some of the thermoelectric elements.

4. The thermoelectric power generator of claim 2, wherein the at least one convective medium flows along at least some of the thermoelectric elements and through at least some of the thermoelectric elements.

5. The thermoelectric power generator of claim 2, wherein the at least one convective medium flows through at least some of the thermoelectric elements.

6. The thermoelectric power generator of claim 5, wherein at least some of the thermoelectric elements are permeable.

7. The thermoelectric power generator of claim 6, wherein at least some of the thermoelectric elements are porous.

8. The thermoelectric power generator of claim 5, wherein at least some of the thermoelectric elements are a honeycomb structure.

9. The thermoelectric power generator of claim 5, wherein at least some of the thermoelectric elements are tubular.

10. The thermoelectric power generator of claim 9, wherein at least some of the tubular elements are constructed of at least one thermoelectric material of a first conductivity type, and at least some of the tubular elements are constructed of at least one thermoelectric material of a second conductivity type.

11. The thermoelectric power generator of claim 9, wherein at least one first set of concentric tubes forms at least one thermoelectric element.

12. The thermoelectric power generator of claim 11, wherein at least some of the concentric tubes alternate between thermoelectric material of a first conductivity type, and thermoelectric material of a second conductivity type.

13. The thermoelectric power generator of claim 2, wherein at least a portion of the array comprises at least one heat transfer feature that improves heat transfer between at least some of the convective medium and at least a portion of the at least one thermoelectric array.

14. The thermoelectric power generator of claim 13, wherein at least some of the thermoelectric elements are tubular, and wherein the at least one heat transfer feature is inside at least some of the tubular thermoelectric elements.

15. The thermoelectric power generator of claim 13, wherein the at least one heat transfer feature is between at least some of the thermoelectric elements.

16. The thermoelectric power generator of claim 13, wherein the at least one heat transfer feature is at least one convective medium flow disturbing feature.

17. The thermoelectric power generator of claim 2, wherein a first plurality of thermoelectric elements is configured for heat transport of a first type and a second plurality of thermoelectric elements is configured for convective heat transport of a second type.

18. The thermoelectric power generator of claim 2, wherein at least part of the at least one convective medium is at least one thermoelectric material, said convective medium thermoelectric material also forming at least some of the thermoelectric elements.

19. The thermoelectric power generator of claim 2, wherein at least part of the at least one convective medium is at least one thermoelectric material, said convective medium thermoelectric material forming a portion of at least some of the thermoelectric elements, and at least one solid thermoelectric material forming a second portion of the same thermoelectric elements.

20. The thermoelectric power generator of claim 2, wherein at least part of the at least one convective medium is at least one fluid.

21. The thermoelectric power generator of claim 20, wherein at least a portion of the at least one convective medium is at least one gas.

22. The thermoelectric power generator of claim 20, wherein at least a portion of the at least one convective medium is at least one fuel.

23. The thermoelectric power generator of claim 20, wherein at least a portion of the at least one convective medium is at least one working material also used in a co-generation process.

24. The thermoelectric power generator of claim 2, wherein at least some of the thermoelectric elements are each formed of a thermoelectric array.

25. The thermoelectric power generator of claim 1, further comprising at least one co-generator configured to operate in conjunction with the thermoelectric power generation system with the convective medium as the co-generator working fluid.

26. The thermoelectric power generator of claim 25, wherein at least a portion of the at least one co-generator comprises at least one combustion process involving combustion of the at least one convective medium.

27. The thermoelectric power generator of claim 26, wherein the at least one co-generator comprises at least one internal combustion engine.

28. The thermoelectric power generator of claim 26, wherein the at least one co-generator comprises at least one external combustion engine.

29. The thermoelectric power generator of claim 26, wherein the at least one co-generator comprises at least one turbine generator.

30. The thermoelectric power generator of claim 25, wherein at least a portion of the at least one co-generator comprises at least one expansion process involving expansion of the at least one convective medium.

31. The thermoelectric power generator of claim 30, wherein the at least one co-generator comprises at least one turbine generator.

32. The thermoelectric power generator of claim 25, wherein at least a portion of the at least one co-generator comprises at least one phase change process in the at least one convective medium.

33. The thermoelectric power generator of claim 25, wherein at least a portion of the co-generator working fluid is water or steam.

34. The thermoelectric power generator of claim 25, wherein at least a portion of the at least one co-generator comprises at least one electrochemical process with the at least one convective medium.

35. The thermoelectric power generator of claim 34, wherein the at least one electrochemical process comprises at least one fuel cell.

36. The thermoelectric power generator of claim 1, further comprising at least one heating or cooling system configured to operate at least in part with the at least one convective medium.

37. The thermoelectric power generator of claim 36, wherein the at least one heating or cooling system comprises at least one absorption system.

39. The method of claim 38, wherein the step of convecting heat comprises flowing at least one convective medium through at least a portion of the at least one thermoelectric array.

40. The method of claim 39, further comprising the step of co-generating power at least in part with said at least one convective medium.

41. The method of claim 40, wherein the step of co-generating comprises combusting at least a portion of the at least one convective medium in at least one co-generator.

42. The method of claim 41, wherein the at least one co-generator comprises at least one turbine generator.

43. The method of claim 40, wherein the step of co-generating comprises expansion of at least a portion of the at least one convective medium.

44. The method of claim 43, wherein the at least one co-generator comprises at least one turbine generator.

45. The method of claim 40, wherein the step of co-generating comprises at least one electrochemical process with at least a portion of the at least one convective medium.

46. The method of claim 45, wherein the at least one electrochemical process comprises at least one fuel cell.

47. The method of claim 40, further comprising the step of heating or cooling at least in part with the at least one convective medium.

48. The thermoelectric power generator of claim 47, wherein the heating or cooling system is at least one absorption system.

38. A method of improving efficiency in a thermoelectric power generation system having a plurality of thermoelectric elements forming at least one thermoelectric array having at least one first side and at least one second side exhibiting at least one temperature gradient between them during operation of the thermoelectric power generation system through the introduction of heat to the system, the method comprising the steps of:

actively convecting thermal power through at least a portion of the array in a generally steady-state manner; and

generating power from the at least one thermoelectric array.