JPH0541330Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a frozen soil forming device for cold storage in underground low temperature warehouses.

"Prior Art" FIG. 3 shows a conventional example of an underground low-temperature warehouse, in which reference numeral 1 indicates the ground, 2 indicates a storage chamber formed underground, and 3 indicates a heat pipe.

The heat pipe 3 encloses a working fluid in a straight cylindrical airtight container 3a that is sufficiently deaerated;
It is constructed so that heat transfer occurs with the phase change of the fluid, and is erected almost vertically on the ground, and the evaporation section 3 is located at the lower side of the closed container 3a.
b is buried underground, and the condensing part 3c located on the upper side of the closed container 3a is exposed to the outside air above the ground. In addition, in order to increase the efficiency of heat inflow and outflow, the condensation part 3c exposed to the air outside the ground is
A plurality of heat receiving and dissipating fins (radiators) 4 are provided in a protruding manner.

Such underground low-temperature warehouses store the cold energy from the outside air in the form of frozen soil in the winter.
The accumulated cold energy is used during the warm summer months, which significantly reduces equipment costs (initial costs) and running costs compared to a case where all of the cooling in storage room 2 is provided by a refrigerator, etc. can be done.

``Problems that the invention seeks to solve'' However, underground low-temperature warehouses that use heat pipes have been developed for only a short time, and there are various issues that need to be solved.

For example, in the example in Figure 3, in order for the heat pipe to function effectively in forming frozen soil, the outside air temperature must be below freezing, the formation period of frozen soil is limited to a certain period such as winter, and underground low-temperature storage is required. The disadvantage is that it takes a long time to form sufficient frozen soil around the refrigerator compartment 2 after it is constructed.

In addition, temperature changes in the outside air directly affect the effectiveness of heat pipes, and if days that are warmer than expected during the winter season continue for longer than expected, the amount of cold heat accumulated in the frozen ground becomes insufficient, and the warm season In the latter half of
Underground cold storage may become unusable.

The present invention was developed in view of the above-mentioned points, and aims to speed up the formation of initial frozen soil to shorten the time it takes to start using an underground low-temperature warehouse, and to reduce the time required to start using an underground low-temperature warehouse when the outside temperature rises due to climate warming. The purpose of this is to enable underground low temperature storage to be used without any problems.

``Means for Solving the Problems'' A frozen soil formation device for cold preservation in underground low temperature warehouses, which freezes the ground around a storage room formed underground and uses it as a cold heat source to keep the storage room cold. ,
Multiple units are installed in the ground around the storage room at appropriate intervals, the condensing part is exposed to the outside air above the ground, and the evaporating part is buried in the ground, and the cold heat of the outside air is transmitted to the ground by the working fluid sealed in the sealed container. A heat pipe, a jacket provided around the airtight container of the heat pipe for cooling, a refrigerator installed at a distance from the heat pipe to generate brine at a low temperature, and a brine cooled by the refrigerator. The structure includes a brine flow path that cools the condensing section by flowing brine through the jacket.

"Operation" When forming initial frozen soil after constructing an underground low temperature warehouse, in addition to cooling the ground with the cold heat of the outside air via heat pipes, the operation of the refrigerator also cools the ground into a low-temperature state. By generating brine and circulating the brine through the jacket through the brine flow path, the condensing section of the heat pipe is directly cooled, and this cold heat is transferred to the ground around the heat pipe, thereby cooling the frozen ground. promotes the formation of

When an underground low-temperature warehouse is in use, the cold heat of the outside air is used to keep the frozen soil cold, and if the outside temperature rises due to climate warming and it becomes difficult to maintain the frozen soil, the freezing machine is turned off. The frozen soil is kept cool by operation and circulation of low-temperature brine, which allows the underground low-temperature warehouse to be used without being affected by the surrounding conditions.

``Example'' Hereinafter, an example of a frozen soil forming apparatus for cold storage in an underground low-temperature warehouse according to the present invention will be described with reference to FIG. 1.

In FIG. 1, reference numeral 7 denotes a heat pipe for an underground low-temperature warehouse (heat pipe), 8 denotes a sealed container, 9 denotes a jacket, 10 denotes a refrigerator, and 11 and 12 denote brine flow paths.

The heat pipe 7 includes a closed container 8 filled with a working fluid, a heat receiving and discharging fin 4 attached to the outer periphery of a condensing section 8c located on the upper side of the container and exposed to the outside air on the ground, and A jacket 9 is attached to the outer periphery of the ground 1 at a position close to the surface of the ground near the bottom of the condensing part 8c, and has a different part from the example shown in FIG. 3, which will be described later. Similar to the example shown in FIG. 3, a plurality of wafers are arranged around 2 at appropriate intervals in the horizontal direction and vertically erected. Note that the reference numeral 8b is an evaporation section buried underground located at the lower side of the closed container 8.

The jacket 9 is provided so as to leave a gap around the airtight container 8 of the heat pipe 7, into which low-temperature brine, which will be described later, is circulated.

As shown in FIG. 1, the refrigerator 10 is installed at a location apart from the heat pipe 7, and generates brine at a low temperature, and is designed to reduce the temperature of the outside air on the ground and the temperature of the underground surrounding the heat pipe 7. The refrigerator 10 is equipped with a temperature detection means for detecting the temperature, and when the outside air temperature above the ground is higher than the underground temperature, etc.
It is possible to operate automatically. Furthermore, the temperature of the brine during operation of the refrigerator 10 is adjusted in accordance with changes in the temperature of the air outside the ground.

The brine channels 11 and 12 are arranged in a connected state between the jacket 9 of the heat pipe 7 and the refrigerator 10, and flow the low-temperature brine generated by the refrigerator 10 into the jacket 9 to the condensing section 8.
c.

As the brine, antifreeze such as ethylene glycol or propylene glycol is used,
It is cooled to an appropriate temperature within the range of -5°C to -40°C.

When the refrigerator 10 is operated, brine in a low temperature state is generated, and the brine in a low temperature state is fed into the jacket 9 through the brine channels 11 and 12 as shown by the arrows in FIG. By circulating, the evaporation section 8b of the heat pipe 7
The ground 1 around the evaporator 8b is brought to a low temperature below freezing point to form frozen ground, and the frozen ground can be formed by operating the refrigerator 10 as necessary.

Immediately after construction of the underground low temperature warehouse, if the outside air above ground is below freezing, the cold heat of the outside air is transferred to the evaporator section 8b via the heat pipe 7 (actually, it is a high temperature section). From the evaporating section 8b to the condensing section 8
The ground 1 around the evaporator 8b is cooled and gradually brought into a frozen state, but the ground 1 around the storage room 2
When it is desired to rapidly freeze the soil, or when the outside temperature is not low enough, the refrigerator 10 is operated to generate brine at a low temperature, and the brine is fed into the jacket 9 via the brine channels 11 and 12. The condensing part 8c of the heat pipe 7 is directly cooled by circulating the heat pipe 7, and the working fluid is condensed and cooled along with this cooling, and the cold heat is transmitted to the ground 1 around the heat pipe 7. Promote the formation of frozen soil.

Immediately after the construction of such an underground low-temperature warehouse, after the initial frozen ground is formed, or in other words, while the underground low-temperature warehouse is in use, the cold energy of the outside air is utilized to take advantage of the fact that the temperature of the outside air is below freezing. The frozen soil is continuously maintained (cooled) by being transmitted to the ground via the heat pipe 7 and cooling the ground 1.

On the other hand, when the outside air temperature rises due to climate warming and it becomes difficult to maintain frozen soil, the temperature of the outside air on the ground and the ground around the heat pipe 7 are detected by the operation of the temperature detection means described above. Freezing is achieved by automatically detecting a medium temperature, operating the refrigerator 10, sending low-temperature brine to the heat pipe 7, and cooling the frozen soil and the ground 1 for the required time. The temperature of the brine during operation of the machine 10 is adjusted in accordance with the temperature change of the air outside the ground, and the frozen soil is kept cool. These settings allow the underground low-temperature warehouse to be used without being affected by the surrounding conditions such as the outside air.

In the embodiment described so far, a flow path for flowing brine around the outer periphery of the closed container 8 was provided by attaching the jacket 9, but instead of attaching the jacket 9, a pipe was simply installed. It may be wound around the outer periphery of the sealed container 8, or the portion where the sealed container 8 is cooled with low-temperature brine may be provided, for example, so as to penetrate through the inside of the sealed container 8. Therefore, these cool the closed container 8 and promote the freezing of the ground 1 using the same concept and function as the jacket 9.

In addition, the jacket 9, as shown in FIG.
It may be attached to a portion of the airtight container 8 exposed above the ground and below the heat receiving and dissipating fins 4. However, in order to minimize the influence of outside air fluctuations, it is preferable to install it underground.

"Effects of the Invention" The frozen soil forming device for cold storage in underground low temperature warehouses according to the present invention has the following effects.

(1) It is equipped with a jacket provided around the airtight container of the heat pipe, a refrigerator that generates brine in a low-temperature state, and a brine flow path that sends the brine in a low-temperature state generated by the refrigerator. By operating the refrigerator, the ground around the storage room is quickly frozen, and the period from when the underground low-temperature warehouse is constructed until it can be used can be significantly shortened compared to conventional examples.

(2) By forcibly freezing the soil using a refrigerator, even if the temperature of the air outside the ground does not fall below freezing, freezing can be carried out effectively and underground low temperature storage warehouses can be used without any problems.

(3) In addition to cooling the ground using a combination of outside air and heat pipes, a refrigerator can also be used in cases where the outside air temperature changes or when there is a shortage of cold energy storage due to abnormal weather, etc. Even under such conditions, it is possible to keep the frozen soil cool by matching the amount of cooling energy to the environmental conditions, ensuring the stability of the frozen soil and achieving the reliability of underground low-temperature storage.

(4) Simplify the structure and obtain economic efficiency by mainly performing cold heat for frozen soil using a heat pipe, using a refrigerator as an auxiliary aid, and cooling with brine via the heat pipe. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing one embodiment of the frozen soil forming device for cold storage in underground low temperature warehouses according to the present invention, and Fig. 2 is another implementation of the frozen soil forming device for cold storage in underground low temperature warehouses according to the present invention. Schematic configuration diagram showing an example. FIG. 3 is a schematic configuration diagram showing a conventional example of an underground low temperature warehouse using heat pipes. 1... Ground, 2... Storage room, 7... Heat pipe for underground low temperature warehouse (heat pipe), 8... Sealed container, 8b... Evaporation section, 8c... Condensation section, 9...
Jacket, 10... Refrigerator, 11, 12... Brine channel.

Claims (1)

[Scope of utility model registration request] This is a frozen soil formation device for cold preservation in an underground low temperature warehouse, which freezes the ground 1 around a storage room 2 formed underground and uses it as a cold heat source to keep the storage room cold. A plurality of heat pipes 7 are arranged at appropriate intervals, a condensing section 8c is exposed to the outside air on the ground, an evaporating section 8b is buried in the ground, and the working fluid sealed in the airtight container 8 transmits the cold heat of the outside air to the ground. and a cooling jacket 9 provided around the airtight container of the heat pipe,
A refrigerator 10 that is installed at a separate position of the heat pipe and generates brine in a low temperature state, and brine channels 11 and 12 that flow the brine cooled by the refrigerator into the jacket to cool the condensation section.
A frozen soil forming device for cold storage in an underground low temperature warehouse, characterized by comprising: