SU757637A1 - Apparatus for cooling and freezing soil - Google Patents

Description

The invention relates to the construction and can be used for cooling and freezing the soil.

A device for cooling and freezing the soil, made in the form of a pipe partially placed in the soil, filled with coolant is known [1].

When the coolant circulates in the soil, its upward and downward flows are mixed, which leads to a decrease in the operating efficiency of the device.

The closest to the invention is a device for cooling and freezing the soil, including a partially enclosed pipe system in the soil with ascending and descending coolant flows, the above-ground part of the pipe with ascending coolant flow being made with a lower thermal conductivity compared to the thermal conductivity of the surface part of the pipe with descending and underground parts with upward coolant flow [2].

In this device, the temperature differential of the coolant in the underground

2

parts of pipes with ascending flows are insignificant, as a result of which the coolant circulates through the pipes insufficiently intensively, and the efficiency of operation of the device is not high enough.

The purpose of the invention is to increase the efficiency of the device.

This is achieved due to the fact that in the device for cooling and freezing the soil, including a closed tube system partially placed in the ground, with ascending and descending coolant flows, than the above-ground pipe portion with upward coolant flow is made with a lower heat transfer compared to its ground heat transfer plot, elevated 20 section of the pipe with a downward flow of the coolant is made with increased heat transfer compared to the heat transfer from its underground section.

In this case, it is preferable that the underground section of the pipe with the ascending flow of the coolant would be made with increased heat transfer compared with the heat transfer from the underground section of the pipe with the downward flow of the heat carrier. Difference heat conductor3

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The above sections of the pipe system can be provided by performing an above-ground pipe section with an ascending and underground pipe section with a downward flow of heat carrier and a material with lower thermal conductivity compared to that of an underground pipe section with an ascending and aboveground pipe section with a downward flow of heat carrier or by the execution of the above-ground section of the pipe with a downward flow of the coolant with fins.

FIG. 1 shows the described general view of the device (an embodiment of pipe sections of materials with different thermal conductivity); figure 2 is the same, top view; FIG. 3 shows the described device, an embodiment of the above-ground section of the pipe with a downward flow of heat carrier with fins; figure 4 - the same, the entrance from the top.

The device consists of a closed pipe system filled with coolant. The pipe system includes overhead 1 and underground 2 areas with a downward flow of coolant, underground 3 and aboveground 4 sites with an upward flow of coolant and expander 5 in the upper part of the device.

Above-ground section 4 of a pipe with an upward flow of coolant has less heat transfer than its underground section 3, and an overground section 1 of a pipe with downward coolant flow has a heat transfer higher than that of its underground section 2. The difference in heat transfer between sites can be achieved by performing section 4 with heat insulation 6, and section 1 - with fins 7 or by making sections 2 and 4 of a material whose thermal conductivity is less than the thermal conductivity of the material of sections 1 and 3.

The device is installed in the working position, immersing the lower part in the ground, and filled with coolant, such as kerosene, so that the level of kerosene is above the top of the pipe sections 1 and 4,

The device works as follows.

With the onset of cold weather, the coolant in the pipe system begins to move. In the expander 5 and pipe 1, the coolant is cooled by outside air, acquiring a large density? ness Dense coolant under the action of its own weight falls through the pipe 2. From pipe 2, the heat carrier enters the pipe 3 and takes heat from the soil surrounding the pipe 3. The temperature of the heat carrier rises, the density decreases.

Ie pipe 3 coolant enters

in the pipe 4 with a low thermal conductivity, and then in the expander 5. In pipes 4 and 1, the temperature and density of the coolant have significant differences. This leads to an increase in the intensity of movement of the coolant in the above-ground pipe system.

Due to the implementation of the pipe 1 with a greater heat transfer, and the pipe 4 with a lower one.

In the case of performing an underground section of pipes 2 with heat transfer, less heat transfer from the underground section is rough 3. Due to the implementation of these sections with the appropriate heat conduction, there is a temperature differential of the heat transfer medium in pipes 2 and 3, thereby increasing the intensity of the heat carrier movement in the underground part of the pipe system .

Thus, due to the increase in the intensity of the coolant movement in the above-ground and underground parts of the pipe system, the efficiency of the device is increased. This leads to an increase in the volume of the frozen ground of the base of the structure, as a result of which a higher stability of the structure is ensured and the possibility of an emergency due to uneven subsidence of foundations and foundations is excluded.

The invention can be used to strengthen the foundations of structures, such as port embankments, built in the northern regions of the country.

Claims (4)

Claim 1. A device for cooling and freezing the soil, including a closed pipe system partially placed in the soil with ascending and descending heat carrier flows, the surface portion of the pipe with the ascending heat carrier flow being made with a lower heat transfer compared to the heat output of its underground portion, characterized in that in order to improve the efficiency of the device, the above-ground section of the pipe with a downward flow of the heat carrier is made with heat transfer compared to the heat output of its underground section but. 2. The device according to claim 1, which is based on the fact that the underground section of the pipe with an upward flow of heat carrier is made with increased heat transfer compared to the heat transfer from the underground section of the pipe with a downward flow of heat carrier. 3. The device according to claims 1 and 2, which is characterized by the fact that the elevated section of the pipe with ascending and the underground section of the pipe with descending flow of the coolant are made of five 757637 6 material with a lower thermal conductivity compared to thermal conductivity, respectively, of an underground pipe section with an ascending and above-ground pipe section with a downward flow of the heat carrier. five 4. The device pop. 1, characterized in that the aboveground part the pipe with a downward flow of the coolant is made with fins. *