JPS62223583A - Cold storage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a low-temperature storage warehouse in which the inside of the warehouse is cooled by freezing a J (hard plate) using a heat pipe.

``Conventional technology J 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 warehouse 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 aimed at solving these problems, the applicants have developed a technology that stores cold energy in the winter in the form of frozen soil and supplies this cold energy during the warm summer months. The idea was that this would result in lower initial costs and running costs 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 applicants conducted various experiments on the creation of frozen soil using heat pipes, and researched the possibility of using it as a low-temperature storage facility.
If it is larger than C-day, it is possible to build frozen soil in the ground using a heat pipe, and in order to store natural cold heat underground for a long time via a heat pipe, the form of latent heat is ideal. We obtained the knowledge that clay soil, which has a high water content, is generally more suitable than sandy soil.

The present invention was made based on this knowledge, and uses heat pipes to store cold energy underground in the winter, and uses this as a cold heat source to keep the inside of the refrigerator at a low temperature, thereby reducing initial costs and running costs. The purpose is to provide a cold storage that can significantly reduce costs.

"Means for Solving the Problems" The low temperature storage according to the present invention uses an excavated hole drilled on the surface of the ground that opens to the outside air as a storage location, and freezes the ground using a heat pipe buried around the ground of the hole. In order to cool the inside of the excavation hole by forming frozen soil, a roof covering the top surface of the excavation hole is placed on the ground around the excavation hole, and the heat pipe is connected to the side wall of the excavation hole. In addition, a circulation pipe filled with brine is inserted into the frozen ground formed by the heat pipe, and at least a portion of it is inserted into the excavation hole. while being led to
It is buried along the heat pipe.

“Effect” M! According to Sei, in the winter, the energy from the cool outside air can be stored as frozen soil and ice in the ground surrounding the excavation type, and during the warm spring and summer months, the stored cold heat energy can be used to move the inside of the excavation hole. Can be kept at low temperatures. At that time, by circulating the brine filled in the circulation pipe buried in the ground along the heat pipe, it becomes possible to efficiently and evenly use the cold storage thermal energy, and control the circulation operation. By doing this, it is easy to maintain a constant low temperature inside the drilled hole.

"Example" The present invention will be described below with reference to the drawings. 1 to 3 show one embodiment of the present invention, and in the figures, reference numeral l
indicates an excavated hole (inside the warehouse) that is opened to the outside air and is excavated on the surface of the ground G. This excavated hole 1 is excavated in a generally rectangular shape as a whole and constitutes a storage place for food, etc. In the illustrated example, the rectangular bottom 2 of the excavated hole 1 is formed into a flat surface, and this bottom A side wall 3 around the opening 2 is formed into an inclined surface that slopes upward toward the opening.

Further, a floor slab 4 is constructed on the upper surface of the bottom portion 2 using concrete, crushed stone, etc., and sandbags 5 are stacked on the sloped side wall portion 3 in order from the bottom portion 2, and On the upper surface of the embankment 6 around the excavated hole l, there is a concrete foundation 8 on which a roof 7 to be described later is placed.
is formed.

Then, the ground G around the Horiki excavation hole l has this ground G.
A plurality of heat pipes 10 are installed along the periphery of the excavation hole 1 at equal intervals to form frozen soil and cool the inside of the excavation hole 1.

As shown in FIG. 1, this heat pipe 10 is constructed so that a working fluid is sealed in a long cylindrical airtight container 11 that is sufficiently deaerated, and heat transfer occurs as the fluid changes phase. In the illustrated example, the upper end 11 of the airtight container 11
a protrudes from the base part 8, extends from its lower side or parallel to the side wall part 3 to the vicinity of the bottom, and furthermore, its tip (lower end) 11
b is buried in such a manner that it extends to the lower part of the bottom (floor) 2.

Further, a plurality of heat receiving and dissipating fins 12 are provided protruding along the length of the upper outer periphery of the airtight container 11 exposed to the outside air in order to increase the efficiency of heat transfer.

In the illustrated example, the lower ends of the left and right heat pipes 10 (lower ends 11b of the airtight container 11) are arranged alternately under the floor so as not to interfere with each other, but this arrangement structure is limited to this case. For example, it may be a structure in which these are slightly wrapped.

In the ground G around the excavation hole 1, a plurality of brine circulation pipes 13 are arranged along the heat pipe 10 in the cross section shown in FIG. It is buried so as to be located between the heat pipes 10 (see FIG. 2). However, unlike the heat pipe 1 (l), this brine circulation pipe 13 does not protrude outward from the foundation part 8 at both ends, and is connected to a header 14 installed in the excavated hole l, making a loop. The brine circulation pipe 13 contains an antifreeze solution such as a calcium chloride solution,
It is filled with so-called brine, and this brine is circulated through the header 14 by a separately prepared circulation device.

A roof 7 covering the upper surface of the excavated hole 1 is placed on a foundation 8 around the excavated hole 1, and has a structure in which a roof plate 7b having an insulating structure is placed over a beam 7a having a truss structure. Note that the structure of the roof 7 is not limited to this one, and other structures may be used.

In the figure, the reference numeral 15 indicates a heat insulating material laid on the outer surface of the embankment, and is especially provided when the outside air temperature is high, such as in summer.

In addition, Figure 3 shows a state in which multiple low-temperature storage units with this structure are installed side by side (in clusters).If this arrangement is used, the heat load will be reduced and efficiency will be increased. Therefore, it is preferable.

Next, a method of constructing the low temperature storage A having such a configuration, a method of using the same, etc. will be explained.

As shown in Figure 1, in order to construct this low-temperature storage A, the ground surface of the storage location is excavated to form an excavated hole l for forming a storage space, and a heat pipe and brine circulation Dig a trench for burying the pipe. Next, the heat pipe 10 and the brine circulation pipe I3 are installed in these grooves, and after backfilling these, the side wall portion 3 is
Sandbags 5 are stacked vertically along the bottom 2 of the excavated hole 1, and concrete or the like is placed on the bottom 2 of the excavated hole 1 to construct the floor slab 4 and form the foundation 8. Then, a roof 7 is attached to the upper surface of this foundation 8, a header 14 for the brine circulation pipe 13 is attached to the roof 7a of the roof 7, and the header 14 is connected to the brine circulation pipe 13 as shown in FIG. Such a cold storage facility will be constructed.

This construction is a simple work of excavating the ground from the surface, backfilling, and forming concrete, and does not require special techniques (such as polling) for the construction (such as installing heat pipes). Since the heat pipe 10, which is maintenance-free, is used instead of the heat pipe 10 as a cold source, installation is simple and costs can be reduced.

Further, in the low temperature storage A of the embodiment, since the side wall portion 3 is formed as an inclined surface, it is possible to support it with inexpensive materials such as sandbags 5, and the cost of constructing the storage place can be reduced.

To use a low temperature storage with such a configuration, first, in winter, the upper part of the heat pipe 10 is cooled with cold air, frozen soil F is built around the heat pipe 10, and supercooled outside air energy is stored. That is, the heat pipe 10
When the upper part of the airtight container 1 is cooled by the cold air in winter, the airtight container 1
The working fluid in 1 condenses into a liquid, which flows down the pipe wall of the airtight container due to gravity. As a result, the cold heat is carried to the lower part, and the ground G around the airtight container 11 is frozen by this carried cold heat, and the ground G around the airtight container 11 is
As shown in Figure 1, frozen soil F is constructed. This phenomenon is repeated in winter, and frozen soil F is built around the heat pipe 10, and supercooled outside air energy (cold energy) is stored in the ground G in the form of frozen soil F and water.

On the other hand, in warm spring and summer months, the cold energy in the frozen soil F is released, and the temperature inside the refrigerator is maintained at a low temperature. At this time, by circulating the brine in the brine circulation pipe 13, the cold heat stored in the frozen soil F can be recovered and sent into the warehouse. As a result, by controlling the circulation of brine, it is possible to maintain the internal temperature at a constant level.

According to the low-temperature storage with the above structure and operation, the excavated hole 1 is used as a storage place, the heat pipe 10 and the brine circulation pipe 13 are installed around it, and the upper surface of the excavated hole 1 is simply covered with the roof 7. Since the heat pipe 10 is maintenance-free, the frozen soil F, water, etc. are constructed, so the running cost is almost negligible.

In the above-mentioned embodiments, the excavated hole I itself is used as a storage place and the roof 7 is attached above it.
It is also possible to install a large-diameter corrugated pipe, box culvert, etc. in this excavated hole I and backfill it as a storage place.

"Effects of the Invention" As explained above, according to the present invention, in winter, energy from outside air can be stored as frozen soil and ice in the ground around the excavation type. Conversely, during the warm spring and summer months, the stored cold heat can be used to lower the temperature inside the drilling hole.
Moreover, by circulating the brine, it is possible to maintain a constant temperature, so it is possible to provide a low-temperature storage with excellent initial and running costs.

Further, according to the present invention, by excavating the ground from its surface,
Since the structure is such that the heat pipe and brine circulation pipe are installed in this excavated hole, there is an advantage that the installation is easy.

[Brief explanation of drawings]

1 to 3 show an embodiment of the low temperature storage according to the present invention. FIG. 1 is a side sectional view showing the configuration of the low temperature storage, FIG. 2 is a plan view thereof, and FIG. It is a perspective view showing a state where low temperature storages are arranged in groups. G...Ground, A...2...Low temperature storage,
I...Drilling hole, 2...Bottom, 3
...Side wall part, 4...Floor slab, 5.
...Sandbag, 6...Embankment, 7.
...Roof, 8...Foundation, 10.
... Heat pipe, 11 ... Airtight container,
13...Brine circulation pipe, 14...
・Header, 15... Insulation material.

Claims (1)

[Claims] A low-temperature storage facility that uses an excavated hole on the surface of the ground and opens to the outside air as a storage place, and cools the inside of the excavated hole by forming frozen soil in the ground using a heat pipe buried in the ground around the excavated hole. A roof is arranged on the ground around the excavation hole to cover the upper surface of the excavation hole, and the lower end of the heat pipe extends along the side wall of the excavation hole to a lower part of the floor of the excavation hole. Moreover, a circulation pipe filled with brine is buried in the ground formed in the frozen ground by the heat pipe, and at least a part of the circulation pipe is guided into the excavation hole. Cold storage.