Thermoelectrics utilizing convective heat flow

• US 7,926,293 B2
• Filed: 07/08/2008
• Issued: 04/19/2011
• 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:
  US12/169,583
• Publication Number:
  US 20090007572A1
• Time in Patent Office: 1,015 Days
• Field of Search: 62/32, 62/33, 62/36, 62/37, 165/80.3, 165/80.4, 165/170
• 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 system comprising:

at least one thermoelectric element array comprising at least one first side and at least one second side, the at least one first side and the at least one second side having a temperature gradient between them during operation, wherein the at least one thermoelectric element array permits flow of at least one convective medium through the at least one thermoelectric element array to provide generally steady-state convective heat transport toward at least one side of the thermoelectric element array.

2. The thermoelectric system of claim 1, wherein the at least one convective medium flows generally from the first side to the second side.

3. The thermoelectric system of claim 1, wherein the at least one convective medium flows generally from the second side to the first side.

4. The thermoelectric system of claim 1, wherein the at least one convective medium flows through the at least one thermoelectric material in at least two general directions.

5. The thermoelectric system of claim 1, wherein the at least one convective medium flows through the at least one thermoelectric element array.

6. The thermoelectric system of claim 1, wherein the at least one convective medium flows along the at least one thermoelectric element array.

7. The thermoelectric system of claim 6, further comprising at least one additional thermoelectric element array.

8. The thermoelectric system of claim 7, wherein the at least two thermoelectric element array form concentric tubes with the convective medium flow between the concentric tubes.

9. The thermoelectric system of claim 1, wherein at least part of the convective medium is a convective medium thermoelectric material, said convective medium thermoelectric material also forming at least a portion of the thermoelectric element array.

10. The thermoelectric system of claim 1, wherein at least part of the convective medium is a convective medium thermoelectric material, said convective medium thermoelectric material forming a first portion of at least a portion of the thermoelectric element array, and a solid thermoelectric material forming a second portion of the thermoelectric element array.

11. The thermoelectric system of claim 1, wherein at least part of the convective medium is a fluid.

12. The thermoelectric system of claim 1, wherein at least part of the convective medium is a solid.

13. The thermoelectric system of claim 1, wherein at least part of the convective medium is a mixture of fluid and solid.

14. The thermoelectric system of claim 1, wherein at least a portion of the thermoelectric element array comprises at least one heat transfer feature that improves heat transfer between at least some of the at least one convective medium and the at least one thermoelectric element array.

15. A method of improving efficiency in a thermoelectric system having at least one thermoelectric element array comprising at least one first side and at least one second side, the at least one first side and the at least second side having a temperature gradient between them during operation, the method comprising actively convecting heat through the at least one thermoelectric element array in a generally steady-state manner.

16. The method of claim 15, wherein actively convecting heat comprises flowing at least one convective medium through the at least one thermoelectric element array.

17. The method of claim 15, wherein actively convecting heat comprises flowing at least one convective medium along the at least one thermoelectric element array.

18. A thermoelectric system comprising:

at least one thermoelectric element array comprising at least one first side and at least one second side, the at least one first side and the at least one second side having a temperature gradient between them during operation, wherein at least a portion of the thermoelectric element array permits flow of at least one convective medium through the at least a portion of the thermoelectric element array to provide generally steady-state convection toward at least one side of the thermoelectric element array; and

at least one control system, said control system comprising;

at least one controller,

at least one input coupled to at least one controller, and

at least one output coupled to at least one controller and to said thermoelectric element array, said output controllable by said controller to modify at least one characteristic of said thermoelectric element array.

19. The thermoelectric system of claim 18, wherein the at least one characteristic impacts the convective heat transport, and wherein the control system improves efficiency by modifying the at least one characteristic.

20. The thermoelectric system of claim 18, wherein the control system varies at least a flow current of the at least one convective medium.