Thermoelectrics utilizing convective heat flow

• US 8,375,728 B2
• Filed: 03/11/2011
• Issued: 02/19/2013
• Est. Priority Date: 02/09/2001
• Status: Expired due to Fees

• Current Assignee: Gentherm Incorporated
• Original Assignee: BSST LLC (Gentherm Incorporated)
• Inventors: Bell, Lon E.
• Primary Examiner(s): Jones, Melvin
• Application Number:
  US13/046,163
• Publication Number:
  US 20110162389A1
• Time in Patent Office: 711 Days
• Field of Search: 62/32, 62/33, 62/36, 62/37
• US Class Current: 62/3.2
• 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 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

Abstract

An improved efficiency thermoelectric system is disclosed wherein convection is actively facilitated through a thermoelectric array. Thermoelectrics are commonly used for cooling and heating applications. Thermal power is convected through a thermoelectric array toward at least one side of the thermoelectric array, which leads to increased efficiency. Several different configurations are disclosed to provide convective thermal power transport, using a convective medium. In addition, a control system is disclosed which responds to one or more inputs to make adjustments to the thermoelectric system.

Claims

1. A thermoelectric power generator 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, 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, wherein at least one convective medium flows at least one of inside, outside and through at least a portion of the thermoelectric array, receives heat from the thermoelectric elements, and convects thermal power through the array, further wherein the thermoelectric power generator is fluidly connectable to either at least one co-generator or heating or cooling system configured to use the thermal power.

2. The thermoelectric power generator of claim 1, wherein at least a portion of the at least one convective medium is recycled again through the thermoelectric power generator.

3. The thermoelectric power generator of claim 2, wherein the at least one convective medium is cooled before the at least one convective medium is recycled again through the thermoelectric power generator.

4. The thermoelectric power generator of claim 1, wherein the received heat causes a phase change of at least a portion of the at least one convective medium.

5. The thermoelectric power generator of claim 1, wherein the at least one convective medium comprises a liquid, wherein the liquid exits the thermoelectric power generator and transports the thermal power away from the thermoelectric power generator.

6. The thermoelectric power generator of claim 1, wherein the at least one convective medium comprises an inert fluid.

7. The thermoelectric power generator of claim 1, wherein the at least one convective medium is a working fluid in the at least one co-generator or heating or cooling system.

8. The thermoelectric power generator of claim 1, wherein the at least one convective medium flows through 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.

9. The thermoelectric power generator of claim 1, wherein at least some of the thermoelectric elements are permeable.

10. The thermoelectric power generator of claim 1, 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.

11. The thermoelectric power generator of claim 1, 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.

12. The thermoelectric power generator of claim 1, 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.

13. The thermoelectric power generator of claim 1, wherein at least one convective medium is a solid or a fluid.

14. The thermoelectric power generator of claim 1, further comprising the at least one co-generator configured to use the thermal power.

15. The thermoelectric power generator of claim 1, further comprising the at least one heating or cooling system configured to use the thermal power.

16. A method of improving efficiency in a thermoelectric power generator 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 generator through the introduction of heat to the system, the method comprising:

actively convecting thermal power through at least a portion of the array in a generally steady-state manner with at least one convective medium, wherein the at least one convective medium flows at least one of inside, outside and through at least a portion of the thermoelectric array and receives heat from the thermoelectric elements, further wherein the power generator is fluidly connectable to either at least one co-generator or heating or cooling system configured to use the thermal power; and

generating power from the at least one thermoelectric array.

17. The method of claim 16, further comprising co-generating power at least in part with the at least one convective medium.

18. The method of claim 17, wherein co-generating comprises combusting at least a portion of the at least one convective medium in at least one co-generator.

19. The method of claim 17, wherein the step of co-generating comprises expansion of at least a portion of the at least one convective medium.

20. The method of claim 17, further comprising heating or cooling at least in part with the at least one convective medium.