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Title: Magnetic refrigeration apparatus with heat pipes

Abstract

A magnetic refrigerator operating in the 4 to 20 K range utilizes heat pipes to transfer heat to and from the magnetic material at the appropriate points during the material's movement. In one embodiment circular disks of magnetic material can be interleaved with the ends of the heat pipes. In another embodiment a mass of magnetic material reciprocatingly moves between the end of the heat pipe or pipes that transmits heat from the object of cooling to the magnetic material and the end of the heat pipe or pipes that transmits heat from the magnetic material to a heat sink.

Inventors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA)
OSTI Identifier:
5531914
Application Number:
ON: DE86013752
Assignee:
Dept. of Energy TIC; ERA-11-005216; EDB-86-137245
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING; MAGNETIC REFRIGERATORS; DESIGN; HEAT PIPES; HEAT TRANSFER; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE; ENERGY TRANSFER; REFRIGERATORS; 420201* - Engineering- Cryogenic Equipment & Devices; 420400 - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Barclay, J.A., and Prenger, F.C. Jr. Magnetic refrigeration apparatus with heat pipes. United States: N. p., 1985. Web.
Barclay, J.A., & Prenger, F.C. Jr. Magnetic refrigeration apparatus with heat pipes. United States.
Barclay, J.A., and Prenger, F.C. Jr. 1985. "Magnetic refrigeration apparatus with heat pipes". United States. doi:.
@article{osti_5531914,
title = {Magnetic refrigeration apparatus with heat pipes},
author = {Barclay, J.A. and Prenger, F.C. Jr.},
abstractNote = {A magnetic refrigerator operating in the 4 to 20 K range utilizes heat pipes to transfer heat to and from the magnetic material at the appropriate points during the material's movement. In one embodiment circular disks of magnetic material can be interleaved with the ends of the heat pipes. In another embodiment a mass of magnetic material reciprocatingly moves between the end of the heat pipe or pipes that transmits heat from the object of cooling to the magnetic material and the end of the heat pipe or pipes that transmits heat from the magnetic material to a heat sink.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1985,
month =
}
  • This patent describes an about 4 to about 20 K. refrigeration apparatus comprising: a magnetic field generating means; a fluid contactable magnetic material interacting with the magnetic field produced by the magnetic field generating means so as to be subjected to a cyclically time varying magnetic field; a fluid effective to transfer heat at temperatures between about 4 and about 20K.; an external heat sink; and at least two directional heat pipes, one such pipe disposed between the fluid and the object of cooling whereby heat from the object of cooling is transmitted through the fluid to the magnetic materialmore » when the magnetic material absorbs heat. Another such pipe is disposed between the fluid and the external heat sink whereby heat from the magnetic material when the magnetic material is rejecting heat is transmitted through the fluid to the external heat sink, and also whereby the heat from the hot ends of the directional heat pipes is minimally transmitted to the cold ends of the directional heat pipes.« less
  • A magnetic refrigerator operating in the 4 to 20 K range utilizes heat pipes to transfer heat to and from the magnetic material at the appropriate points during the material's movement. In one embodiment circular disks of magnetic material can be interleaved with the ends of the heat pipes. In another embodiment a mass of magnetic material reciprocatingly moves between the end of the heat pipe of pipes that transmits heat from the object of cooling to the magnetic material and the end of the heat pipe or pipes that transmits heat from the magnetic material to a heat sink.
  • This invention is directed to transferring heat from an extremely high temperature source to an electrically isolated lower temperature receiver. The invention is particularly concerned with supplying thermal power to a thermionic converter from a nuclear reactor with electric isolation. Heat from a high temperature heat pipe is transferred through a vacuum or a gap filled with electrically nonconducting gas to a cooler heat pipe. The heat pipe is used to cool the nuclear reactor while the heat pipe is connected thermally and electrically to a thermionic converter. If the receiver requires greater thermal power density, geometries are used withmore » larger heat pipe areas for transmitting and receiving energy than the area for conducting the heat to the thermionic converter. In this way the heat pipe capability for increasing thermal power densities compensates for the comparatively low thermal power densities through the electrically nonconducting gap between the two heat pipes.« less
  • A vapor compression refrigeration and/or heat pump system employing a particular type of expansion motor replacing the expansion valve of a conventional system is disclosed.
  • An improvement in a control system is described having a multistage space thermostat with a first stage adapted to control a refrigeration heat pump apparatus and with a second stage adapted to control an auxilliary heating apparatus and having an outdoor temperature responsive means responsive to outdoor temperature for disconnecting the heat pump from the first stage to render the heat pump inoperative and connecting the auxilliary heat to be controlled by the first stage when the outdoor temperature is below a predetermined value. The improvement consists of: anticipation means for each of the first and second stages of themore » space thermostat, and means connected to the outdoor temperature responsive means to connect the anticipation means of each of the stages to be controlled by the first stage at a predetermined outdoor temperature when the auxiliary heating apparatus is controlled by the first stage to reduce the abrupt change in controlled space temperature by the transfer of the control of auxiliary heat from the second stage to the first stage.« less