Refrigeration – Refrigeration producer – Evaporator – e.g. – heat exchanger
Patent
1980-10-29
1982-07-20
Capossela, Ronald C.
Refrigeration
Refrigeration producer
Evaporator, e.g., heat exchanger
62437, 165 80E, 165185, F25B 1900
Patent
active
043404057
ABSTRACT:
The disclosure is directed to an apparatus and method for maintaining a body at cryogenic temperatures at a remote location such as down a borehole for an extended period of time. A housing contains a body comprising a material having a high specific heat at cryogenic temperatures such as between about 2 and 15 K. The body contains an orifice for containing an instrument or instruments operable at superconducting temperatures. The apparatus is precooled at the surface and lowered into a borehole to a desired depth, such as 2 to 3 miles. The instruments are operated, and the apparatus withdrawn, the material of the body maintaining the very low temperatures at which the instrument(s) operate for a sufficient period of time at the remote or downhole location. The material may comprise a rare earth compound, such as Gd.sub.2 O.sub.3, Gd.sub.2 Se.sub.3, Gd.sub.2 O.sub.2 S or GdAlO.sub.3. Monoclinic and C-phase gadolinium oxides work well. A low temperature is maintainable at a remote location for several hours.
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NASA Tech. Brief 65-10289, "Boron Nitride Housing Cools Transistors," Sep. 1965.
Justice et al., "Thermophysical Properties of the Lanthanide Oxides I," J. Phys. Chem. 67, 339, (Feb. 1963).
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Westrum, Jr., "Thermophysical Properties of the Lanthanide Oxides III," J. Phys. Chem 67, 659, (Mar. 1963).
Overton, Jr., "Feasibility of Detecting Artificial Magnetic Anomalies in Hydrofractured Rock by Superconducting Gradiometer-SQUID Systems," Los Alamos Scientific Laboratory Report LA-6626-MS, (Dec. 1976).
Rosenblum et al., "High Specific Heat Metals for Use in Superconducting Composites," IEEE Trans. on Magnetics MAG-13, No. 1, 834, (Jan. 1977).
Overton, Jr. William C.
Steyert, Jr. William A.
Besha Richard G.
Capossela Ronald C.
Gaetjens Paul D.
The United States of America as represented by the United States
Weig Robert W.
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