JPH01300176A - Underground low temperature storage - Google Patents

Abstract

PURPOSE:To control overcooling and effectively maintain constant temperature by providing a water storage vessel in which part of water is frozen by cool of frozen soil in a part of a storage room when cooling the storage room by making the frozen soil by cool of the ground outside air. CONSTITUTION:In winter the transfer of heat is performed between the condensing part 4a of a heat pipe 4 and the evaporating part 4b of soil and the heat of the ground 2 of the circumference of the evaporating part 4b is radiated in the outside air while the cool of the outside air is transferred to the soil, the ground 2 of the circumference thereof is frozen, frozen soil 11 is constructed and a storage room 1 is cooled by the frozen soil 11. In a water storage vessel 6 of the bottom part of the storage room 1, a freezing phenomenon by the cool of the frozen soil 11 occurs in the water 8 thereof and ice 12 is formed, but the water 8 is maintained at the constant temperature of 0 deg.C until the whole water is frozen. Further, since heat (88cal/g) is radiated when the water 8 is frozen, overcooling is controlled in the storage room 1. Thus the storage room 1 can always be maintained at constant low temperature.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to an underground low-temperature storage facility that cools the inside of a storage room by transmitting cold heat from the air outside the ground into the soil via a heat pipe and freezing the ground. In particular, the present invention relates to a technique for maintaining a constant temperature within a storage chamber.

"Conventional technology" Generally, when storing grains such as rice, food, etc.
It is required to be carried out in an environment of constant low temperature and constant humidity.

Conventionally, this type of storage facility has been applied, for example, to a low-temperature storage facility that uses a refrigerator to maintain the interior at a constant temperature, but the equipment cost (initial cost) and running cost are high. It is expensive.

"Problems to be Solved by the Invention" As a result of intensive research to solve these problems, the inventor of the present invention found that it is possible to store cold heat in the winter in the form of frozen soil and supply this cold heat during the warm summer months. The idea was that the initial cost and running cost would be lower compared to storage using conventional refrigerators.

However, the reality is that if artificial frozen soil is created by forced cooling using electricity, it is not possible to significantly reduce initial costs and running costs. Therefore, the present inventor conducted various experiments on the creation of frozen soil using heat pipes, and as a result of researching the possibility of using it as a low-temperature storage storage, the inventor found that the cumulative final value was 400℃・da.
If it is larger than y, it means that frozen soil can be built in the ground by heat vibrator, and the form of latent heat is ideal for storing natural cold energy underground for a long time via heat vibrator.
For this purpose, we learned that the ground is more preferable than bedrock, and that clay soil, which generally has a high moisture content, is more suitable than sandy soil.

However, if frozen soil forms in a cold region, the storage room space surrounded by frozen soil will become too cold to below 0°C during the severe cold season, so it must be heated with heaters using electricity, oil, etc. Not only is this expensive, but it also causes unevenness in temperature, making it difficult to adjust the temperature, and may impede the construction of frozen soil.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to maintain a constant temperature within a storage chamber without increasing costs.

"Means for Solving the Problems" The present invention is characterized in that a water storage tank is provided in a part of the storage room, in which a part of the water is frozen by the cold heat of frozen soil.

"Operation" When frozen soil is formed in the low-temperature storage of the present invention, a freezing phenomenon occurs in the water in the water storage tank due to the cold heat of the frozen soil. In this case, the temperature of the water is maintained constant at 0℃ until it is completely frozen, and when it freezes, it releases heat, so even if the frozen soil becomes too cold during the severe cold season, etc. Supercooling can be suppressed within the storage room.

In addition, in summer and the like, water can thaw part of the frozen ground and effectively release cold energy, and the water can also freeze to form a new source of cold energy.

"Example" Hereinafter, an example of the underground low temperature storage of the present invention will be described based on the drawings.

In this low-temperature storage, a storage room l is formed on the surface of the ground 2 and is covered above with a roof 3, and
A heat vibrator 4 is buried in the ground 2 around it. The heat vibrator 4 has a condensing part 4a exposed to the outside air on the ground, and an evaporating part 4b buried in the soil, and a plurality of heat vibes 4 are arranged in parallel at equal intervals around the storage room l. , are buried so as to extend from the side to the bottom of the storage chamber 1, respectively. In this case, as shown in the drawings, the lower ends of the left and right heat barbs 4 are arranged in a vertically wrapped manner to avoid mutual interference. Note that heat radiation fins 5 are provided in the condensation section 4a on the ground.

A water storage WI6 is formed at the bottom of the storage chamber l so as to constitute the bottom wall 1a thereof, and a water injection system 7 for supplying water from the ground is connected to the water storage tank 6, and the inside is , a thermometer (shown in the diagram), etc. for measuring the temperature of the water 8 therein is provided.

In addition, the reference numeral 9 in the figure is installed vertically in the water storage tank 6 and is connected to the bottom wall 1.
The column supporting a, the reference numeral 10, indicates a storage item.

In the low-temperature storage warehouse configured in this way, heat is transported between the condensation part 4a of the heat barb 4 and the evaporation part 4b in the soil in winter, and the heat in the ground 2 around the evaporation part 4b is dissipated to the outside air. At the same time, the cold heat of the outside air is carried into the soil, the surrounding ground 2 is frozen, frozen soil 11 is constructed, and the interior of the storage room 1 is cooled by the frozen soil 11. This phenomenon is repeated in the winter, and appropriately cool outside air energy (cold energy) is accumulated in 1K of frozen soil.

On the other hand, during warm spring and summer months, the cold energy stored in the frozen soil 1 is released, and the inside of the storage room 1 is maintained at a low temperature.

In this case, the storage room! In the water storage tank 6 at the bottom, a freezing phenomenon occurs in the water 8 therein due to the cold heat of the frozen soil 11, and ice 1
2 is formed, but the water 8 remains at a constant temperature of 0° C. until it is all frozen. In addition, when the water 8 freezes, it releases heat (80 cal/g), so it has the same effect as a heater, so even if the frozen soil 11 becomes too cold during the severe cold season, it will remain in the storage room l. Supercooling is suppressed.

In this way, by appropriately injecting water 8 into the water storage tank 6, the interior of the storage chamber 1 can be maintained at a constant low temperature. Note that the water 8 is preferably injected when the temperature in the water tank 6 becomes 0° C. or lower, or when the amount of unfrozen water 8 in the water tank 6 becomes low. In addition, as shown by the chain line in the drawing, a water sprinkler pipe 13 is installed on the inner surface of the upper part of the storage room 1, and water is allowed to flow down from the water pipe 13 along the wall surface, thereby covering the entire inner surface of the storage room 1. The above-mentioned effect is exerted, and the temperature can be more effectively maintained at a constant temperature.

In the above embodiments, the water tank was provided at the bottom of the storage chamber, but in the present invention: 1. In addition to the bottom, for example, the water tank may be constructed in a cylindrical shape to constitute the side wall of the storage chamber.
The design can be changed as appropriate.

"Effects of the Invention" As is clear from the above description, the low temperature storage of the present invention can provide the following effects.

(i) A portion of the water in the water tank is frozen by the cold heat of the frozen soil, creating a mixed state of water and ice, thereby making it possible to maintain the inside of the storage room at a constant temperature of approximately 0°C.

(ii) Even if the frozen soil cools down to below 0°C, the heat released when the water in the water storage tank freezes suppresses supercooling in the storage room, making it possible to effectively maintain a constant temperature. .

(iii) It utilizes abundant water resources and can be constructed by simple means of water storage with little power source,
Cost reduction can be achieved.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the low temperature storage of the present invention. l...Storage room, 2...Ground, 3...
...Roof, 4...Heat pipe, 4a...
...Condensing section, 4b... Evaporation section, 5...
Radiation fin, 6...Water tank, 7...Water injection system, 8...Water, 9...Strut, IO・
...Stored materials, 11...Frozen soil, 12...
...Water, 13...Water pipe.

Claims (1)

[Claims] An underground low-temperature storage facility that cools the inside of a storage room by burying a heat pipe in the ground surrounding a storage room formed in the soil and turning the ground into frozen soil using the cold heat of the air outside the ground, which is a part of the storage room. An underground low-temperature storage facility comprising a water storage tank in which a portion of the water is frozen by the cold heat of the frozen soil.