IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0764819
(2007-06-19)
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등록번호 |
US-8104293
(2012-01-31)
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발명자
/ 주소 |
- Barve, Jayesh Jayanarayan
- Samiappan, Chandrasekhar
- Murthy, Sunil Srinivasa
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
5 |
초록
▼
A method of operating a cooling device is provided. The method includes sequentially regulating a temperature of a plurality of thermally coupled magneto-caloric elements for maximizing a magneto-caloric effect for each of the magneto-caloric elements when subjected to a magnetic regenerative refrig
A method of operating a cooling device is provided. The method includes sequentially regulating a temperature of a plurality of thermally coupled magneto-caloric elements for maximizing a magneto-caloric effect for each of the magneto-caloric elements when subjected to a magnetic regenerative refrigeration cycle.
대표청구항
▼
1. A method comprising: controlling a temperature of the plurality of magneto-caloric elements to be substantially equal to an activation temperature of each respective magneto-caloric element, wherein said controlling includes: subjecting magneto-caloric elements in a first magneto-caloric block to
1. A method comprising: controlling a temperature of the plurality of magneto-caloric elements to be substantially equal to an activation temperature of each respective magneto-caloric element, wherein said controlling includes: subjecting magneto-caloric elements in a first magneto-caloric block to a magnetic regenerative refrigeration cycle to regulate a temperature of magneto-caloric elements of a second magneto-caloric block, wherein said regulation includes selectively establishing thermal contact between the magneto-caloric elements of the first and second magneto-caloric block and one or both of a medium flow configured to transfer thermal energy to the magneto-caloric elements of the first magneto-caloric block and a medium flow configured to receive thermal energy from the magneto-caloric elements of the first magneto-caloric block;when the temperature of the magneto-caloric elements of the second magneto-caloric block is substantially equal to an activation temperature for the magneto-caloric elements of the second magneto-caloric block, and while subjecting the magneto-caloric elements in the first magneto-caloric block to the magnetic regenerative refrigeration cycle, subjecting the magneto-caloric elements in the second magneto-caloric block to a magnetic regenerative refrigeration cycle. 2. The method of claim 1, wherein the activation temperature of the magneto-caloric elements is determined based upon a Curie temperature of a respective magneto-caloric element, or a magneto-caloric effect curve of the respective magneto-caloric element, or intensity of an applied magnetic field, or combinations thereof. 3. The method of claim 1, further comprising regulating a temperature of magneto-caloric elements of a third magneto-caloric block via the magnetic regenerative refrigeration cycles of the magneto-caloric elements of the first and second magneto-caloric blocks only after initiation of the magnetic regenerative refrigeration cycles of the magneto-caloric elements of both the first and second magneto-caloric blocks. 4. The method of claim 1, further comprising: measuring a temperature of at least one of the magneto-caloric elements in the second magneto-caloric block;comparing the measured temperature of the at least one magneto-caloric element in the second magneto-caloric block with the activation temperature for each respective magneto-caloric element; andheating or cooling the at least one magneto-caloric element in the second magneto-caloric block by transferring heat through a fluid medium. 5. The method of claim 4, wherein the fluid medium comprises ethylene glycol, or water, or propylene glycol, or helium, or nitrogen, or dynalene, or combinations thereof. 6. The method of claim 1, wherein subjecting the magneto-caloric elements in the first magneto-caloric block to the magnetic regenerative refrigeration cycle comprises heating, or cooling the magneto-caloric elements through isentropic magnetization, or through isentropic demagnetization, and transferring heat from the magneto-caloric elements through the fluid medium. 7. The method of claim 1, wherein said selectively establishing thermal contact between the magneto-caloric elements of the first magneto-caloric block and one or both of a medium flow configured to transfer thermal energy to the magneto-caloric elements of the first magneto-caloric block and a medium flow configured to receive thermal energy from the magneto-caloric elements of the first magneto-caloric block includes selectively establishing thermal contact between the magneto-caloric elements of the first magneto-caloric block and one or both of a medium flow configured to transfer thermal energy to the magneto-caloric elements of the first magneto-caloric block and a medium flow configured to receive thermal energy from the magneto-caloric elements of the first magneto-caloric block based upon a measured temperature of the at least one magneto-caloric element and the activation temperature for the respective magneto-caloric element in the second magneto-caloric block. 8. A method comprising: sequentially regulating a respective temperature of each of a plurality of thermally coupled magneto-caloric elements to be substantially equal to an activation temperature of the respective magneto-caloric element, wherein said sequentially regulating a respective temperature includes selectively establishing thermal contact between the respective magneto-caloric elements and one or both of a medium flow configured to transfer thermal energy to the magneto-caloric elements and a medium flow configured to receive thermal energy from the magneto-caloric elements;when the respective temperature of each of the magneto-caloric elements is substantially equal to the activation temperature for that respective magneto-caloric element, subjecting that magneto-caloric element to a magnetic regenerative refrigeration cycle; andsimultaneously subjecting each of the magneto-caloric elements to a magnetic regenerative refrigeration cycle to maintain the respective temperature of each of the plurality of magneto-caloric elements at the temperature substantially equal to the activation temperature of the respective magneto-caloric element to facilitate cooling of an environment. 9. The method of claim 8, wherein sequentially regulating comprises: selecting a first magneto-caloric block having one or more magneto-caloric elements, at least one of the magneto-caloric elements having a temperature substantially equal to the activation temperature of the respective element;selecting a second magneto-caloric block having one or more magneto-caloric elements; andsubjecting the magneto-caloric elements in the first magneto-caloric block to a magnetic regenerative refrigeration cycle to regulate the temperature of the magneto-caloric elements of the second magneto-caloric block to be substantially equal to the activation temperature for each respective magneto-caloric element. 10. The method of claim 9, further comprising sequentially repeating the process of selecting the first and second magneto-caloric blocks and subjecting the first magneto-caloric block to the magnetic regenerative cycle for regulating temperatures of the plurality of magneto-caloric elements of the second magneto-caloric block to be substantially equal to the activation temperature for each respective magneto-caloric element. 11. The method of claim 8, wherein the activation temperature of each of the magneto-caloric elements is determined based upon a Curie temperature of the respective magneto-caloric element, or a magneto-caloric effect curve of the respective magneto-caloric element, or intensity of an applied magnetic field, or combinations thereof. 12. A cooling device, comprising: a plurality of thermally coupled magneto-caloric elements configured to be selectively subjected to a magnetic regenerative refrigeration cycle and to provide cooling of an environment;a control system configured to control a temperature of the plurality of magneto-caloric elements to be substantially equal to an activation temperature of each respective magneto-caloric element and to selectively subject the magneto-caloric elements to a magnetic regenerative refrigeration cycle;one or more reservoirs containing a fluid medium; andfirst and second heat exchangers thermally coupled to the plurality of magneto-caloric elements and at least one of the one or more reservoirs for transferring heat between the magneto-caloric elements and the environment through the fluid medium,wherein the control system is configured to subject a first, but not a second or third, of the magneto-caloric elements to a magnetic regenerative refrigeration cycle so as to regulate the temperature of the first and a second, but not the third, of the magneto-caloric elements until the temperature of the second of the magneto-caloric elements is substantially equal to the activation temperature of the second of the magneto-caloric elements, and then to subject the first and second, but not the third, of the magneto-caloric elements to a magnetic regenerative refrigeration cycle so as to regulate the temperature of the first, second, and third of the magneto-caloric elements until the temperature of the third of the magneto-caloric elements is substantially equal to the activation temperature of the third of the magneto-caloric elements, and then to subject the first, second, and third of the magneto-caloric elements to a magnetic regenerative refrigeration cycle. 13. The cooling device of claim 12, wherein the control system is configured to sequentially regulate the temperature of each of the plurality of magneto-caloric elements to be substantially equal to the activation temperature of the respective magneto-caloric element during a start-up mode of operation. 14. The cooling device of claim 13, wherein the control system is configured to maintain the temperature of each of the plurality of magneto-caloric elements to be substantially equal to the activation temperature of the respective magneto-caloric element during a steady-state mode of operation. 15. The cooling device of claim 12, wherein the control system is configured to estimate the activation temperature of each of the plurality of magneto-caloric elements based upon a Curie temperature of the respective magneto-caloric element, or a magneto-caloric effect curve of the respective magneto-caloric element, or intensity of an applied magnetic field, or combinations thereof. 16. The cooling device of claim 15, further comprising a memory configured to store Curie temperatures, or magneto-caloric effect curves, or combinations thereof for each of the plurality of magneto-caloric elements for estimation of the activation temperature of each of the magneto-caloric elements. 17. The cooling device of claim 12, wherein said one or more reservoirs include first and second reservoirs containing a fluid medium. 18. The cooling device of claim 17, further comprising: a plurality of temperature sensors configured to monitor temperature of at least one of the plurality of magneto-caloric elements; anda plurality of bypass valves configured to selectively, via the control system, control flow of the fluid medium through the plurality of magneto-caloric elements based upon a measured temperature of the at least one of the plurality of magneto-caloric elements and the activation temperature of respective magneto-caloric element. 19. The cooling device of claim 12, further comprising a valve for coupling, or decoupling the environment from the plurality of magneto-caloric elements during a steady-state, or a start-up mode of operation. 20. The cooling device of claim 12, wherein the plurality of magneto-caloric elements comprise Gadolinium alloys, or lanthanum alloys, or manganese alloys, or samarium alloys, or cobalt alloys, or tin alloys, or combinations thereof. 21. The cooling device of claim 12, wherein the device is configured to provide cooling of a refrigeration system, or a chiller, or a gas liquefaction plant, or a cryocooler, or a magnetic bearing device, or an electronic device, or an automotive, or an air conditioning system, or a rotating machine, or combinations thereof. 22. A system, comprising: at least one cooling device having a plurality of magneto-caloric elements subjected to a magnetic regenerative refrigeration cycle and configured to provide cooling of an environment;a magnet configured to magnetize and demagnetize the plurality of magneto-caloric elements;a control system configured to control a temperature of the plurality of magneto-caloric elements to be substantially equal to an activation temperature of each respective magneto-caloric element;one or more reservoirs containing a fluid medium; andfirst and second heat exchangers thermally coupled to the plurality of magneto-caloric elements and at least one of the one or more reservoirs for transferring heat between the magneto-caloric elements and the environment through the fluid medium,wherein the control system is configured to sequentially regulate the temperature of each of the plurality of magneto-caloric elements to be substantially equal to the activation temperature of the respective magneto-caloric element, and to initiate, and then simultaneously maintain, the magnetic regenerative refrigeration cycle for each of the plurality of magneto-caloric elements after the temperature of each of the plurality of magneto-caloric elements is substantially equal to the activation temperature of the respective magneto-caloric element. 23. The system of claim 22, wherein the system comprises a refrigeration system, or a chiller, or a gas liquefaction plant, or a cryocooler, or a magnetic bearing device, or an electronic device, or an automotive, or an air conditioning system, or a rotating machine, or combinations thereof. 24. The system of claim 22, wherein the control system is configured to sequentially regulate the temperature of the plurality of magneto-caloric elements to be substantially equal to the activation temperature of each respective magneto-caloric element during a start-up mode of operation. 25. The system of claim 22, wherein the control system is configured to maintain the temperature of the plurality of magneto-caloric elements to be substantially equal to the activation temperature of each respective magneto-caloric element during a steady-state mode of operation. 26. The system of claim 22, wherein the control system is configured to estimate the activation temperature of each of the plurality of magneto-caloric elements based upon a Curie temperature of the respective magneto-caloric element, or a magneto-caloric effect curve of the respective magneto-caloric element, or intensity of an applied magnetic field, or combinations thereof. 27. The system of claim 22, wherein said one or more reservoirs includes first and second reservoirs having a fluid medium. 28. The system of claim 27, further comprising: a plurality of temperature sensors configured to monitor temperature of at least one of the magneto-caloric elements; anda plurality of bypass valves configured to selectively, via the control system, control flow of the fluid medium through the plurality of magneto-caloric elements based upon a measured temperature of the at least one of the plurality of magneto-caloric elements and the activation temperature of respective magneto-caloric element.
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