Compact, high-efficiency thermoelectric systems
View Patent ↗A number of compact, high-efficiency thermoelectric system utilizing the advantages of thermal isolation in the direction of a working medium flow or movement, in manufacturable systems, are described. Such configurations exhibit high system efficiency and power density. Several different embodiments and applications are disclosed utilizing a plurality of thermoelectric modules or thermoelectric elements sandwiched between heat exchangers.
1. An improved thermoelectric system comprising:
a plurality of thermoelectric modules, at least some of which are substantially thermally isolated from each other, each module having a hotter side and a colder side; and
at least one solid movable working medium in thermal communication with at least two of the plurality of thermoelectric modules in sequence, such that the working medium is progressively cooled or heated in stages by at least two of the plurality of thermoelectric modules, the working medium movable relative to at least two of the plurality of thermoelectric modules as the working medium is cooled or heated.
2. The thermoelectric system of claim 1 , wherein the working medium comprises a plurality of disk-like media mounted to a rotating shaft, and said media form a stacked configuration with the thermoelectric modules sandwiching at least some of the disk-like media.
3. The thermoelectric system of claim 1 , wherein the working medium comprises a plurality of working media forming an alternating stacked configuration of thermoelectric modules and working media.
4. The thermoelectric system of claim 3 , wherein the working media substantially thermally isolate at least some of the plurality of thermoelectric modules.
5. An improved thermoelectric system comprising:
a plurality of thermoelectric modules, at least some of which are substantially thermally isolated from each other, the plurality of thermoelectric modules comprising at least one N-type thermoelectric element and at least one P-type thermoelectric element, each thermoelectric module having a hotter side and a colder side; and
a plurality of heat transfer devices, at least some of which are in different planes and in thermal communication with at least one of the plurality of thermoelectric modules, at least two of the heat transfer devices fluidly coupled together and accepting a first working fluid that flows sequentially through the at least two heat transfer devices, wherein the first working fluid is cooled or heated in stages as it flows through the at least two heat transfer devices.
6. The thermoelectric system of claim 5 , wherein each of at least some of the heat transfer devices are sandwiched between at least two thermoelectric modules.
7. The thermoelectric system of claim 6 , wherein at least one of the plurality of thermoelectric modules has its cooler side facing a sandwiched heat transfer device.
8. The thermoelectric system of claim 5 , wherein the thermoelectric modules and heat transfer devices form a stack, with the cooler sides of at least some of the thermoelectric modules generally facing one another, separated by at least one heat transfer device, and the hotter sides of at least some of the thermoelectric modules generally facing one another, separated by at least one heat transfer device.
9. The thermoelectric system of claim 5 , wherein the heat transfer devices are heat exchangers comprising a housing and heat exchanger fins, the heat exchanger fins of a heat exchanger forming stages in the direction of the working fluid flow, so as to provide additional thermal isolation for at least one of the thermoelectric modules in thermal communication with the heat exchanger.
10. The thermoelectric system of claim 5 , wherein the first working fluid flows in the same direction through each of the cooling heat transfer devices.
11. The thermoelectric system of claim 8 , wherein the heat transfer devices accept a working fluid to flow through them in a defined direction.
12. The thermoelectric system of claim 11 , wherein the heat transfer devices are heat exchangers comprising a housing with heat exchanger elements inside formed in segments, and wherein at least one of the segments is substantially thermally isolated from at least one other of the segments.
13. The thermoelectric system of claim 12 , further comprising at least one conduit providing a fluid path from a first heat exchanger to a second heat exchanger, such that working fluid travelling through the first heat exchanger and the second heat exchanger is cooled or heated in stages.