JP2607914B2 - Underground cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a low-temperature storage in the soil that cools a storage room by transmitting the cold heat of the outside air above the ground through a heat pipe to freeze the ground. More particularly, the present invention relates to a technique for maintaining a constant temperature in a storage room.

[Prior Art] Generally, when storing grains such as rice, food, and the like, it is required to store them in a constant low-temperature, constant-humidity environment.

Conventionally, as a storage facility of this type, for example, a low-temperature storage configured to maintain the inside of a refrigerator at a constant temperature using a refrigerator is applied, but equipment costs (initial costs) and running costs are reduced. It is expensive.

"Problems to be solved by the invention" As a result of intensive research to solve such problems, the present inventor stores cold heat in winter in the form of frozen soil, and supplies this cold heat in warm summer, etc. Thus, it has been concluded that the initial cost and the running cost can be reduced as compared with a storage using a conventional refrigerator.

However, if artificial frozen soil is created by forced cooling with electric power, the actual cost cannot be significantly reduced in initial costs and running costs.
Therefore, the present inventor conducted various experiments on the creation of frozen soil using heat pipes and studied the possibility of use as a low-temperature storage.
If it is larger, the form of latent heat is ideal for building frozen ground in the ground with heat pipes and storing natural cold heat for a long time underground through heat pipes. It was found that cohesive soils with higher water content are generally more suitable than sandy soils.

However, if frozen soil is formed in a cold region, the storage room space surrounded by the frozen soil will be excessively cooled to 0 ° C. or less during the severely cold season, and therefore, it must be heated by a heater using electricity, oil, etc. Not only is it costly, but it also makes it difficult to adjust the temperature due to unevenness in humidity, which may hinder the construction of frozen soil.

The present invention has been proposed in view of the above circumstances, and has as its object to maintain a constant temperature in a storage room without increasing costs.

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

"Action" In the cold storage of the present invention, when frozen soil is formed,
Even in the water storage tank, a freezing phenomenon occurs due to the cold heat of the frozen soil in the water therein. In this case, the temperature of the water is kept constant at 0 ° C. until the whole is frozen, and heat is released at the time of freezing. Therefore, even if the frozen soil becomes too cold in a severe cold season, Supercooling can be suppressed in the storage room. In summer or the like, water can melt part of the frozen soil to effectively release cold heat, and the water can also freeze to form a new cold heat source.

Hereinafter, an embodiment of the low-temperature storage in soil according to the present invention will be described with reference to the drawings.

In this low-temperature storage, the storage room 1 is formed on the surface of the ground 2 and is covered with a roof 3 on the upper side, and a heat pipe 4 is embedded in the surrounding ground 2. The heat pipe 4 has a condensing part 4a exposed to the outside air on the ground, an evaporating part 4b buried in the soil, and a plurality of heat pipes 4 are arranged in parallel around the storage room 1 at equal intervals. Each of them is buried so as to extend from the side of the storage room 1 to below. In this case, as shown in the drawing, the lower end portions of the left and right heat pipes 4 are arranged so as to be wrapped up and down to avoid mutual interference. The radiating fins 5 are provided in the condensing section 4a on the ground.

A water storage tank 6 is formed at the bottom of the storage chamber 1 so as to form a bottom wall 1a. The water storage tank 6 is provided with a water injection system 7 for supplying water from the ground. Is provided with a thermometer (not shown) for measuring the temperature of the water 8 therein.

Reference numeral 9 in the drawing stands upright in the water storage tank 6 and
The strut supporting 1a, reference numeral 10 indicates a stock.

In the cold storage thus configured, heat is transferred between the condensing part 4a of the heat pulp 4 and the evaporating part 4b in the soil in winter, and the heat of the ground 2 around the evaporating part 4b is radiated 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, and the frozen soil 11 is constructed.
Thereby, the inside of the storage room 1 is cooled. This phenomenon is repeated in winter, and supercooled outside air energy (cooling energy) is accumulated in the frozen soil 11.

On the other hand, in warm spring or summer, cold energy accumulated in the frozen soil 11 is released, and the inside of the storage room 1 is maintained at a low temperature.

In this case, in the water storage tank 6 at the bottom of the storage room 1, a freezing phenomenon occurs due to the cold heat of the frozen soil 11 in the water 8 therein, and the ice 12
, But the temperature of the water 8 is kept constant at 0 ° C. until it is completely frozen. Further, since water (80 cal / g) is released when the water 8 freezes, an effect similar to that of a heater occurs, and even if the frozen soil 11 becomes too cold in a severe cold season or the like, the inside of the storage room 1 is not Supercooling is suppressed.

In this way, by appropriately injecting the water 8 into the water storage tank 6, the inside of the storage room 1 can be always maintained at a constant low temperature state. The water 8 is injected into the water tank 6
This may be performed when the temperature of the inside becomes 0 ° C. or less, or when the amount of unfrozen water 8 in the water storage tank 6 decreases. Also, as shown by a chain line in the drawing, a water sprinkling pipe 13 is laid on the upper inner side surface of the storage room 1 and water flows down from the water sprinkling pipe 13 along the wall surface, so that the entire inner surface of the storage room 1 is The above-described operation is exhibited, and the constant temperature can be more effectively maintained.

In the above embodiment, the water storage tank is provided at the bottom of the storage room, but in the present invention, not only the bottom portion, but also, for example, a cylindrical shape is formed to constitute the side wall of the storage room.
The design can be changed as appropriate.

"Effects of the Invention" As is clear from the above description, the low-temperature storage according to the present invention has the following effects.

(I) A part of the water in the water storage tank is frozen by the cold heat of the frozen soil to form a mixed state of water and ice, so that the storage room can be maintained at a constant temperature of approximately 0 ° C.

(Ii) Even if the frozen soil becomes too cold below 0 ° C., the supercooling is suppressed in the storage room by the heat released when the water in the water tank freezes, and the constant temperature can be effectively maintained. .

(Iii) While using abundant water resources, it can be configured by simple means of storing water with a small power source, thereby achieving cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of a low-temperature storage according to the present invention. 1 ... storage room, 2 ... ground, 3 ... roof, 4 ... heat pipe, 4a ... condensing section, 4b ... evaporating section, 5 ... radiation fins, 6 ... water tank, 7 ... note Water system, 8 ... water, 9 ... pillar, 10 ... storage, 11 ... frozen soil, 12 ... ice, 13 ... watering pipe.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masataka Mochizuki 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Electric Wire Co., Ltd. (72) Inventor Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fuji Electric Cable Co., Ltd. (56) References JP-A-62-142973 (JP, A)

Claims (1)

(57) [Claims] 1. A low-temperature underground storage for cooling a storage room by burying a heat pipe in a ground around a storage room formed in the soil and converting the ground into frozen ground by the cold heat of the outside air, A low-temperature storage medium in soil, wherein a water storage tank in which a part of water is frozen by the cold heat of the frozen soil is provided in a part of a storage room.