Showing papers on "Thermal reservoir published in 1970"

Geothermal energy recovery from deep caverns in salt deposits by means of air flow

Abstract: There is disclosed a method for abstracting geothermal heat from depths below ground that are inaccessible by commercially practicable bore hole drilling techniques. More particularly, the invention is of a method for extracting heat from such an inaccessible source which comprises forming a cavern or reservoir at an accessible depth in a salt dome or spire which is in thermal communication with the otherwise inaccessible heat source, and flowing air at comparatively low speeds through the cavern in heat-exchange relation with the wall surfaces thereof to absorb heat therefrom, and then flowing it speedily through a relatively small (compared to the cavern volume) passageway to a point of use above ground, whereby it retains a substantial proportion of the heat energy absorbed in the cavern. Such energy is utilized in any suitable manner, one such preferred use being for the evaporation of brine extracted from the cavern during preparation thereof or obtained from neighboring salt deposits.

Thermal Anchoring of Wires in Cryogenic Apparatus

Abstract: Thermal anchoring of wires to heat sinks in cryogenic equipment is discussed. An analysis is presented to relate the length of tempered wire required and measurable parameters of the system. The solution of the problem is included along with tabular values for typical situations.

Thermal battery having a thermal reservoir pellet

Abstract: A THERMAL BATTERY HAVING HEAT GENERATING MEANS FORMING A PART OF STACKED CELLS OF THE BATTERY AND ACTING TO FUZE AN ELECTROLYTE TO ACTIVATE THE BATTERY AND INCLUDING A THERMAL RESERVOIR MEANS NEAR THE ENDS OF THE CELL STACK FOR ABSORBING HEAT FORM THE HEAT GENERATING MEANS DURING COMBUSTION THEREOF AND FOR THEREAFTER RELEASING HEAT TO THE CELL STACK. ELEMENTS OF THE BATTERY CELL STACK ARE FORMED AS PELLETS OR DISCS WHICH RETAIN SHAPE DURING OPERATION AND ARE STACKED IN AN ASSEMBLY WHICH REDUCES BATTERY VARIATIONS DURING OPERATION.

Process for reducing heat loss during in situ thermal recovery

Abstract: A continuous blanket of an inert gas is introduced between the hydrocarbon bearing reservoir and the overburden rock. The gas in injected in either a countercurrent or co-current direction with the progress of the thermal recovery front. By this injection an insulation medium is provided by the inert non-condensable gas such that heat losses to the overburden rock are reduced to a nominal amount and a more efficient thermal recovery process is achieved.

Heat conduction with melting simulated on a resistance-capacitance network

Abstract: The melting of materials during heating is modelled automatically on a resistance-capacitance network analogue using field effect transistor switches. Full details are given of the experimental techniques. Results are presented for the particular example of a flat slab heated by a concentrated heat source with melting occurring in the vicinity of the heat source. Non-dimensional curves are included from which the rise of temperature with time at a number of points can be determined. The latent heat of the material is also modelled on the network and for the problem of the concentrated heat source it is found to have no significant effect on the results. The results are shown to be independent of the conditions on the edge of the slab provided that the edge is a distance of at least 1?5 times the slab depth from the heat source.

A method for the engineering calculation of the temperature fields of solids under conditions of natural heat exchange with the atmosphere

Abstract: A method is developed for the engineering calculation of the temperature field of a solid [1] when its surface is subject to heat transfer by radiation, convection, and evaporation or condensation simultaneously. Solutions are given for an exponential initial temperature distribution and a two-layer system.

Thermodynamic limitation on the conversion of heat into coherent radiation

Abstract: From the thermodynamical point of view there is the possibility of supplying a small amount of the energy of coherent radiation from a thermal reservoir. This possibility is attributed to the finite flow of entropy of light which is coherent but shows amplitude and/or phase fluctuations even if the radiation field consists of only a single mode.

Nonlinear heat conduction with nonstationary boundary conditions

Abstract: We study the one-dimensional nonstationary temperature field in a solid when the thermal conductivity and heat capacity depend linearly on the temperature.