THERMO-MAGNETIC ENGINE APPARATUS AND REVERSIBLE THERMO-MAGNETIC CYCLE APPARATUS

• US 20120266591A1
• Filed: 04/19/2012
• Published: 10/25/2012
• Est. Priority Date: 04/25/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Morimoto, Tsuyoshi, Yatsuzuka, Shinichi, Nishizawa, Kazutoshi, Watanabe, Naoki
• Granted Patent: US 9,027,339 B2
• Time in Patent Office: Days
• US Class Current: 60/527
• CPC Class Codes: F03G 7/00 Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
• CPC Class Codes: F25B 21/00 Machines, plants or systems, using electric or magnetic effects
• CPC Class Codes: F25B 2321/0022 with a rotating or otherwise moving magnet
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A thermo-magnetic engine apparatus includes a magnetic element having a high temperature end to which hot energy is supplied and a low temperature end to which cold energy is supplied, a magnetic-field applier device, and a power source device. Curie temperature of the magnetic element is set between a temperature of the high temperature end and a temperature of the low temperature end. The power source device gains a magnetic power generated between the magnetic element and the magnetic-field applier device as kinetic energy.

Claims

1. A thermo-magnetic engine apparatus comprising:

a magnetic element having a high temperature end to which hot energy is supplied and a low temperature end to which cold energy is supplied, the magnetic element having a Curie temperature set between a temperature of the high temperature end and a temperature of the low temperature end, a magnetism of the magnetic element decreasing when a temperature of the magnetic element is equal to or higher than the Curie temperature and increasing when the temperature of the magnetic element is lower than the Curie temperature;

a pump pumping heat transport medium toward the low temperature end from the high temperature end when the magnetic element is heated and pumping heat transport medium toward the high temperature end from the low temperature end when the magnetic element is cooled;

a magnetic-field applier device that applies an external magnetic field to the magnetic element; and

a power source device that gains a magnetic power generated between the magnetic element and the magnetic-field applier device as kinetic energy.

2. The thermo-magnetic engine apparatus according to claim 1, wherein

the magnetic element has a distribution of the Curie temperature that corresponds to a temperature distribution defined between the high temperature end and the low temperature end, and

the pump switches a flow direction of the heat transport medium so that the magnetic element alternately has a temperature equal to or higher than the Curie temperature or a temperature lower than the Curie temperature.

3. The thermo-magnetic engine apparatus according to claim 2, wherein

the magnetic element has a plurality of element units that respectively have Curie temperatures different from each other, and

the plurality of element units are arranged in series between the high temperature end and the low temperature end in order of the Curie temperatures.

4. The thermo-magnetic engine apparatus according to claim 1, further comprising:

a low-temperature heat exchanger that exchanges heat with a heat source supplying the cold energy;

a low-temperature circulation passage passing through the low-temperature heat exchanger;

a high-temperature heat exchanger that exchanges heat with a heat source supplying the hot energy; and

a high-temperature circulation passage passing through the high-temperature heat exchanger, wherein

the pump discharges the heat transport medium to the high-temperature circulation passage from the high-temperature end when the heat transport medium flows from the low-temperature end to the high-temperature end,

the pump draws the heat transport medium from the high-temperature circulation passage to the high-temperature end when the heat transport medium flows from the high-temperature end to the low-temperature end,

the pump discharges the heat transport medium to the low-temperature circulation passage from the low-temperature end when the heat transport medium flows from the high-temperature end to the low-temperature end, and

the pump draws the heat transport medium from the low-temperature circulation passage to the low-temperature end when the heat transport medium flows from the low-temperature end to the high-temperature end.

5. The thermo-magnetic engine apparatus according to claim 4, wherein

the magnetic element includes

a first magneto-caloric element arranged in a first unit, the first magneto-caloric element having the high temperature end and a middle low temperature end opposite from the high temperature end, and

a second magneto-caloric element arranged in a second unit, the second magneto-caloric element having the low temperature end and a middle high temperature end opposite from the low temperature end,

the magnetic-field applier device includes

a first permanent magnet arranged in the first unit, the first permanent magnet applying the external magnetic field for the first magneto-caloric element, and

a second permanent magnet arranged in the second unit, the second permanent magnet applying the external magnetic field for the second magneto-caloric element,

the pump discharges the heat transport medium to the high-temperature circulation passage from the high temperature end when the heat transport medium flows from the middle low temperature end to the high temperature end in the first unit,

the pump draws the heat transport medium from the high-temperature circulation passage to the high temperature end when the heat transport medium flows from the high temperature end to the middle low temperature end in the first unit,

the pump discharges the heat transport medium to the low-temperature circulation passage from the low temperature end when the heat transport medium flows from the middle high temperature end to the low temperature end in the second unit, and

the pump draws the heat transport medium from the low-temperature circulation passage to the low temperature end when the heat transport medium flows from the low temperature end to the middle high temperature end in the second unit.

6. A reversible thermo-magnetic cycle apparatus which is selectively used as the thermo-magnetic engine apparatus according to claim 1 or a magneto-caloric effect type heat pump apparatus which supplies heat of a heat source to a thermal load, wherein when the reversible thermo-magnetic cycle apparatus is used as the magneto-caloric effect type heat pump apparatus:

the magnetic element generating heat when an external magnetic field is applied to and absorbing heat when the external magnetic field is removed from, as a magneto-caloric element;

the power source device switches the external magnetic field between the applying and the removal by causing the magneto-caloric element and the magnetic-field applier device to have a relative movement, as a magnetic field switcher; and

the pump pumping heat transport medium to flow from the low temperature end toward the high temperature end when the external magnetic field is applied to the magneto-caloric element and pumping heat transport medium to flow from the high temperature end toward the low temperature end when the external magnetic field is removed from the magneto-caloric element, as a pump device.

7. The reversible thermo-magnetic cycle apparatus according to claim 6, wherein

the magneto-caloric element has a plurality of element units that respectively have efficient temperature ranges different from each other, the element unit having high magneto-caloric effect in the efficient temperature range, and

the plurality of element units are arranged in series between the high temperature end and the low temperature end in a manner that the efficient temperature ranges are aligned in order of temperature.

8. The reversible thermo-magnetic cycle apparatus according to claim 6, wherein

the pump has a phase for heat transport,

the magnetic-field applier device or the magnetic field switcher has a phase for magnetic-field variation, and

the phase for heat transport and the phase for magnetic-field variation are set to have a predetermined phase shift from each other so as to switch the reversible thermo-magnetic cycle apparatus between the thermo-magnetic engine apparatus and the magneto-caloric effect type heat pump apparatus.