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Permafrost structural support with integral heat pipe means
| Details |
Inventors: Waters, Elmer Dale;
Assignee: McDonnell Douglas Corporation (Long Beach, CA)
Primary Examiner: Davis, Jr.; Albert W.
Assistant Examiner:
Attorney, Agent or Firm: Jeu; D. N., Jason; Walter J., Royer; Donald L.
Structural support assembly for use in arctic and subarctic (permafrost) areas or in any areas where the upper ground layer is subject to a severe annual freeze-thaw cycle, including the cooperative combination of a support structure and a heat pipe element installed in generally frozen soil. The heat pipe is of a suitably complementary configuration and/or disposition with respect to the support structure to provide appropriate stabilization of the surrounding frozen soil. In one embodiment, the heat pipe element is disposed externally of the support structure and, in another embodiment, it is disposed internally of (and integrally combined with) such structure. The external embodiment further includes one version employing a linear (straight) heat pipe element and another version employing an angular (helical) element. |
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DETAILED DESCRIPTION Briefly, and in general terms, my invention is preferably accomplished by providing a structural support assembly for use in arctic, subarctic and similar regions, including a cooperative combination of a support structure and a heat pipe element, which can be directly and easily installed in generally frozen soil to provide a stable support for various apparatus and structures.
The heat pipe element is of suitably complementary configuration and/or disposition with respect to the support structure to provide appropriate stabilization of the surrounding frozen soil.
Where the support structure is of the form of a wooden utility pole, for example the heat pipe element can be of either a linear (straight) configuation or an angular (helical) one positioned adjacent to the surface of the lower embedded portion of the pole.
Both straight and helical elements extend at least over the embedded length of their respective poles and protrude a predetermined distance linearly above the ground for heat exchange purposes.
The heat pipe element broadly includes an elongated tubular container having a filling or charge of a suitable working fluid, and a heat exchanger (radiator) suitably coupled or integrally incorporated with the protruding upper portion of the tubular container.
Means for attaching the lower embedded portion of the tubular container to the surface of the pole can be utilized where desired or required.
Each of the straight and helical heat pipe elements can be fabicated in a two-part assembly wherein the upper radiator section, located above the ground, can be readily separated an detached from the lower embedded section.
In this instance, the upper and lower heat pipe sections are secured together in an overlapping joint.
Heat transfer between the two parts is facilitated by, for example, a thermal paste used between the contiguous faces of the joined parts.
While the heat removal rate with the two-part assembly is about 12% less than with a one-part assembly, the two-part assembly permits easy replacement of radiator that may be damaged by large animals (migrating caribou, bears, etc
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