Thermoelastic cooling

Patent metadata

Field	Value
Publication number	US-10808159-B2
Application number	US-201816180649-A
Country	US
Kind code	B2
Filing date	Nov 5, 2018
Priority date	Apr 11, 2011
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A cooling system based on thermoelastic effect is provided. The system comprises a heat sink, a refrigerated space and a regenerator coupled to the refrigerated space and to the heat sink to pump heat from the refrigerated space to the heat sink. The regenerator comprises solid thermoelastic refrigerant materials capable of absorbing or releasing heat.

First claim

The invention claimed is:

1. A cooling system, comprising:
a heat sink;
a refrigerated space; and
a regenerator connected to the refrigerated space and to the heat sink such that the regenerator can pump heat from the refrigerated space to the heat sink,
wherein the regenerator comprises:
a plurality of solid refrigerant materials capable of exhibiting a thermoelastic effect, each refrigerant material being a solid columnar thermoelastic member having a top face;
a center driving shaft; and
a top compression-loading plate obliquely fixed to the center driving shaft,

wherein the solid columnar thermoelastic members are disposed around the center driving shaft with their respective top faces abutting the top compression-loading plate such that, when the center driving shaft is driven to rotate the top compression-loading plate, the solid columnar thermoelastic members are successively stressed by compression and relaxed.

2. The cooling system of claim 1 , wherein the solid refrigerant materials comprise a composite of at least one of Nickel Titanium alloys, Copper Aluminum Nickel, Copper Zinc Nickel, Copper Zinc Aluminum, Iron Palladium, Gold Cadium, Nickel Manganese Gallium, Iron Manganese, and derivative alloys of Nickel Titanium alloys, Copper Aluminum Nickel, Copper Zinc Nickel, Iron Palladium, Gold Cadium, Iron Manganese, or Nickel Manganese Gallium.

3. The cooling system of claim 1 , wherein the regenerator is connected to the refrigerated space and to the heat sink through direct contact.

4. The cooling system of claim 1 , wherein the regenerator is connected to the refrigerated space and to the heat sink through a circulating heat exchange medium.

5. The cooling system of claim 1 , wherein:
the solid columnar members have respective longitudinal axes that are parallel to and spaced apart from each other, and
the longitudinal axes of the solid columnar members are parallel to and spaced apart from a first axis about which the top compression-loading plate is rotated.

6. The cooling system of claim 1 , wherein the solid columnar thermoelastic members and the compression-loading plate are arranged such that:
a first member of the solid columnar thermoelastic members is compressed by the compression-loading plate to have a fully stressed state, so as to fully transform to martensite phase thereby releasing heat;
at a same time, a second member of the solid columnar thermoelastic members is relaxed by the compression-loading plate to have a fully relaxed state, so as to fully transform to austenite phase thereby absorbing heat, the second member being on an opposite side of the center driving shaft from the first member; and
at the same time, third and fourth members of the solid columnar thermoelastic members are compressed by the compression-loading plate to have a partially stressed state, so as to be in a middle of a reversible transformation between martensite and austenite phases, the third and fourth members being between the first and second members in a side view, the fourth member being on an opposite side of the center driving shaft from the third member.

7. The cooling system of claim 1 ,
wherein the solid refrigerant materials release heat to the heat sink when the solid refrigerant materials are in thermal contact with the heat sink while the solid refrigerant materials are being stressed; and
wherein the solid refrigerant materials absorb heat from the refrigerated space when the solid refrigerant materials are in thermal contact with the refrigerated space while the solid refrigerant materials are being relaxed from a previously stressed state.

8. The cooling system of claim 7 , wherein the solid columnar thermoelastic members are arranged with respect to the center driving shaft such that a first one of the solid columnar thermoelastic members is compressed by the top compression-loading plate to stress said first one at a same time as a second one of the solid columnar thermoelastic members, which is on an opposite side of the center driving shaft from the first one, is relaxed by the top compression-loading plate.

9. The cooling system of claim 1 , wherein the solid refrigerant materials undergo reversible austenite to martensite phase transition upon application of stress.

10. The cooling system of claim 9 , wherein heat is released when the solid refrigerant materials undergo reversible austenite to martensite phase transition, and wherein said heat is greater than 1 J/g.

11. The cooling system of claim 9 , wherein the solid refrigerant materials comprise a composite of polymers that exhibit reversible solid to solid transition associated with absorbing or releasing heat.

12. The cooling system of claim 9 , wherein the solid refrigerant materials completely transform from martensite to austenite phase at a temperature that is equal to or lower than the designed temperature of the refrigerated space.

13. A cooling system, comprising:
a heat sink;
a refrigeration space; and
a regenerator comprising:
a plurality of columnar thermoelastic members, each columnar thermoelastic member having an end face, each columnar thermoelastic member further having an austenite phase and a martensite phase, the columnar thermoelastic members undergoing:
a phase transition from the austenite phase to the martensite phase, releasing latent heat, when mechanically stressed; and
a phase transition from the martensite phase to the austenite phase, absorbing latent heat, when relaxed from the mechanically-stressed state; and

stress and relax means for:
successively mechanically stressing by compression each columnar thermoelastic member to cause the phase transition from the austenite phase to the martensite phase to release the latent heat to the heat sink, and
successively relaxing the mechanically-stressed state of each columnar thermoelastic member to cause the phase transition from the martensite phase to the austenite phase to absorb the latent heat from the refrigeration space.

14. The cooling system of claim 13 , wherein:
the stress and relax means comprises a center driving shaft and a top compression-loading plate obliquely fixed to the center driving shaft, and
the plurality of columnar thermoelastic members are disposed around the center driving shaft with their respective end faces abutting the top compression-loading plate such that, when the driving shaft is driven to rotate the top compression loading plate, the plurality of columnar thermoelastic members are successively stressed and relaxed.

15. A regenerator for use in a heat exchange system to extract heat from a refrigeration space and release heat to a heat sink, the regenerator comprising:
a plurality of columnar thermoelastic members, each columnar thermoelastic member having an austenite phase and a martensite phase, the columnar thermoelastic members undergoing:
a phase transition from the austenite phase to the martensite phase, releasing latent heat, when mechanically stressed; and
a phase transition from the martensite phase to the austenite phase, absorbing latent heat, when relaxed from the mechanically-stressed state; and

stress and relax means for:
successively mechanically stressing by compression each columnar thermoelastic member to cause the phase transition from the austenite phase to the martensite phase to release the latent heat, and
successively relaxing the mechanically-stressed state of each columnar thermoelastic member to cause the phase transition from the martensite phase to the austenite phase to absorb the latent heat.

16. The regenerator according to clai

Assignees

• Univ Maryland
• Cui Jun

Inventors

• Takeuchi Ichiro
• Cui Jun
• Wuttig Manfred R
• Wu Yiming
• Radermacher K Reinhard
• Hwang Yunho
• Muehlbauer Jan

Classifications

• F03G7/0646

  for pumping or compressing fluids · CPC title

• F03G7/062

  characterised by the activation arrangement · CPC title

• F03G7/0614

  using shape memory elements · CPC title

• F25B23/00

  Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect · CPC title

• C09K5/14 Primary

  Solid materials, e.g. powdery or granular · CPC title