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Title: Convective heat flow probe

Abstract

A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansionmore » mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.« less

Inventors:
; ;
Publication Date:
OSTI Identifier:
6132297
Application Number:
ON: TI85006509
Assignee:
Dept. of Energy SNL; EDB-85-036707
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; HEAT FLOW; MEASURING INSTRUMENTS; PROBES; BOREHOLES; CONVECTION; DESIGN; HEATERS; MONITORING; TEMPERATURE MEASUREMENT; CAVITIES; ENERGY TRANSFER; HEAT TRANSFER; MASS TRANSFER; 150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys

Citation Formats

Dunn, J.C., Hardee, H.C., and Striker, R.P. Convective heat flow probe. United States: N. p., 1984. Web.
Dunn, J.C., Hardee, H.C., & Striker, R.P. Convective heat flow probe. United States.
Dunn, J.C., Hardee, H.C., and Striker, R.P. 1984. "Convective heat flow probe". United States. doi:.
@article{osti_6132297,
title = {Convective heat flow probe},
author = {Dunn, J.C. and Hardee, H.C. and Striker, R.P.},
abstractNote = {A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month = 1
}
  • A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing andmore » which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packer-type seals are provided along the probe above and below the heater pads.« less
  • A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged aroung the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing andmore » which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packer-type seals are provided along the probe above and below the heater pads.« less
  • According to one embodiment of the invention, a method includes providing a conduit having a fluid flowing therethrough, disposing a plurality of temperature measurement devices inside a wall of the conduit, positioning at least some of the temperature measurement devices proximate an inside surface of the wall of the conduit, positioning at least some of the temperature measurement devices at different radial positions at the same circumferential location within the wall, measuring a plurality of temperatures of the wall with respective ones of the temperature measurement devices to obtain a three-dimensional temperature topology of the wall, determining the temperature dependentmore » thermal conductivity of the conduit, and determining a multi-dimensional thermal characteristic of the inside surface of the wall of the conduit based on extrapolation of the three-dimensional temperature topology and the temperature dependent thermal conductivities.« less
  • This patent describes an industrial heat treat furnace comprising: (a) an insulated furnace casing defining an enclosure; (b) a sealed, imperforate, generally thin walled, shell member having a closed end within the enclosure. The shell member containing an atmospheric gas initially at a first temperature; (c) at least one workpiece within the shell member; (d) source means remotely situated from the shell member for generating a fluid medium at a second temperature different than the first temperature; (e) heat transfer means in communication with the source means and situated within the enclosure relatively close to the shell member to effectmore » heat transfer between the fluid medium at the second temperature and the exterior of the shell member's thin wall so that the temperature of the shell member's thin wall approaches the second temperature; and (f) jet pump means within the shell member producing an annular jet of atmosphere gas traveling the length of the shell member. The annular jet having an initial diameter when formed at a position remote from the closed end smaller than the inside diameter of the shell member.« less
  • This invention relates to a method and apparatus for making high -powered lasers. More particularly, this invention relates to a method and apparatus for utilizing a spiral cooling fin design to achieve convective gas transport in a laser such as a CO/sub 2/ laser.