JP3512209B2 - Ice thermal storage tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage tank for storing heat source water for air conditioning in the form of coexistence with ice.

[0002]

2. Description of the Related Art Conventionally, when cooling and heating water is circulated through a water side heat exchanger of a fan coil unit or a water heat source heat pump unit arranged in a building, the cold heat during cooling is stored in a heat storage tank. A heat storage system using a so-called ice heat storage method for storing in the form of ice has been proposed. According to such a system, for example, a refrigerator is driven by electric power at night to make ice, and a large amount of cold heat in the ice state is stored in the heat storage tank, and then the cold heat of the ice is taken out as cold water during the cooling operation to obtain the secondary side heat. It circulates to an exchanger (load side heat exchanger), and since latent heat at the time of solid-liquid phase transformation of water is used, a large amount of cold heat can be stored even in a small-scale device, and thus it has been particularly noted in recent years.

More recently, a large-scale heat storage using a so-called multi-tank type heat storage tank, which is composed of a large number of tanks using an underground slab, and in which each tank is sequentially connected by a communication pipe, is used as a cold / hot water tank. Equipment is also proposed.

FIG. 3 shows typical piping of a conventional multi-tank type ice heat storage tank when a double slab is used. As shown in the figure, in the conventional apparatus, the small water tanks 1a, 1b, 1c, and 1d are connected in series by a communication pipe 7, and the ice water is filtered by an ice filter 8 provided in each small water tank. Only this is collected and sent by the pump 3 to the subcooler 2 via the carrier pipe 4. The heat storage water cooled to the supercooling area by the supercooler 2 is then dropped to the vertical pipe 5, where it is converted into ice / water slurry and sent to each small water tank via the pipe line 6. It is stored as cold heat in a small water tank. As described above, by using the multi-tank type ice heat storage tank, it is possible to store a large amount of cold heat by using inexpensive nighttime electric power, for example.

However, as shown in FIG. 3 , in the case of using a constitution in which the small water tanks are connected in series by communication pipes and the stored water in the water tank separated from the ice by the ice filter is returned to the subcooler, it is sufficient. In order to ensure the circulation of cold water, it was necessary to use a pump with a large output or to connect each small water tank with a large number of communication pipes. However, the output of the pump is naturally limited, and depending on the structure of the building, it may not be possible to pipe a large number of communication pipes, and a solution to this has been desired. Furthermore, if the ice layer stored in the small water tank becomes thick, the communication pipes are connected in series even if a high-output pump is used or if a large number of communication pipes are provided. Therefore, circulation of heat storage water may become difficult.

[0006]

SUMMARY OF THE INVENTION Therefore, in view of the above problems of the conventional apparatus, an object of the present invention is to provide a high output pump even for an ice heat storage tank system including a large number of small water tanks. It is an object of the present invention to provide a structure of a new and improved ice heat storage tank that can circulate a sufficient amount of heat storage water without using the above or arranging a large number of communication pipes.

[0007]

In order to solve the above problems, the present invention provides an ice heat storage tank for storing ice / water slurry as heat source water for air conditioning, and an ice heat storage tank installed outside the ice heat storage tank. A supercooler capable of cooling the water to be passed to a subcooling area, and water in the ice heat storage tank is continuously passed into the subcooler to continuously discharge supercooled water from a discharge end of the subcooler. A system for discharging, and an ice / water slurry conversion means for converting the supercooled water into ice / water slurry and introducing it into the ice heat storage tank,
In an ice heat storage tank comprising a system for guiding return water from a load side into the ice heat storage tank for defrosting the ice / water slurry stored in the ice heat storage tank, the ice heat storage tank is the same. It comprises a plurality of small water tanks installed at a height, and the ice / water slurry is converted from the ice / water slurry converting means into a bottom portion in each of the small water tanks via a first pipeline system connecting the respective small water tanks in parallel.
While being dispensed from said each of the small water tub a second pipeline system with cold water tank in the upper from the respective small water tank via connecting in parallel
Opening for water intake provided above the ice nucleus separating means
There is provided an ice heat storage tank characterized by being configured to be recovered from . In addition, it is also possible to pipe the first and second pipeline systems so as to penetrate the small water tanks.

Further, when the number of small water layers is large, according to the present invention, the plurality of small water tanks are divided into a plurality of blocks, and each of the blocks has the first pipeline system and the first pipe system. Two
Of the ice / water slurry from the ice / water slurry conversion means to each block via a third pipeline system in which the first pipeline systems of the blocks are connected in parallel. In addition to distributing, cold water is collected from each of the blocks via a fourth pipeline that connects the second pipelines of the blocks in parallel. Also in this case, the third and fourth pipeline systems may be arranged so as to penetrate through the small water tanks.

[0009]

According to the present invention, since the second pipe line system for collecting the heat storage water of the water phase separated from the ice by the ice filter is arranged in parallel, the heat storage system can be formed from a large number of small water tanks. Even when configured, it is possible to uniformly collect the stored heat water from each small water tank. Further, since the first pipeline system for supplying the ice / water slurry to each small water tank is also arranged in parallel, it is possible to store the ice / water slurry uniformly in each small water tank. Further, by providing an appropriate valve means on a branch pipe communicating with each small water tank, it is possible to control water intake from each small water tank and supply of ice / water slurry to each small water tank as desired. . As described above, according to the ice heat storage tank of the present invention, the heat storage water can be efficiently circulated, so that the heat storage efficiency can be improved.

Further, when the number of small water tanks increases,
According to another aspect of the present invention, the small water tank is divided into several blocks, and each block is connected by a parallel pipeline system, so that each block and its blocks are configured without piping a large number of pipelines. It is possible to uniformly supply ice / water slurry to each of the small water tanks, and it is possible to uniformly collect the heat storage water from each block and each small water tank that constitutes the block.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an outline of an ice heat storage system according to the present invention.
b, 1c and 1d are a carrier pipe 6 which is a supply pipe system for supplying ice / water slurry and a branch pipe 9 branching from the carrier pipe 6.
a, 9b, 9c, 9d are connected in parallel, and at the same time, a carrier pipe 10 which is an intake pipe line system for taking water from each small water tank and branch pipes 11a, 11b, 1 branching therefrom.
It is connected in parallel by 1c and 11d. In the illustrated example, four small water tanks are connected, but the configuration according to the present invention can be applied to an ice heat storage system including a plurality of two or more small water tanks, the number of which depends on the above embodiment. Is not limited.

In the illustrated example, the branch pipes 11a, 11b, 1
1c and 11d are ice filters 13a and 13d, respectively.
b, 13c, 13d is provided with water intake openings 12a, 12b, 12c, 12d above the ice nuclei separating means, and by driving the pump 3 or the like, ice nuclei are removed from the ice water phase by the ice filter. The heat storage water that has been separated and becomes a water phase is taken from each small water tank, and is transferred via the transfer pipes 10 and 4.
It is continuously supplied to the subcooler 2. The heat storage water passed through the subcooler 2 is cooled to a supercooling region of 0 ° C. or lower, discharged as supercooled water into the atmosphere, and then dropped into the vertical pipe 5.

The vertical pipe 5 is a vertical pipe having an inner diameter sufficient to receive the discharge flow of the supercooled water, and a divergent receiving portion is formed at the upper end thereof to open the lower end thereof. Communicate with the carrier pipe 6. The transport pipe 11 and the small water tank 1a, 1b, 1c, and the bottom of 1d, freely branched pipe 9a-off by the respective valves, 9b, connected by 9c, 9 d. With this configuration, the ice / water slurry generated by the impact when the supercooled water discharged from the subcooler 2 falls into the vertical pipe 5 keeps the fluid state while maintaining the flow state. Each branch pipe 9a, 9b, 9
Each of the small water tanks 1a, 1b, 1c, and 1d can be independently conveyed through c and 9d.

According to the present invention, since the carrier pipe 6 is connected in parallel to each small water tank as described above, the generated ice
The water slurry can be uniformly distributed to each small water tank via the branch pipes 9a, 9b, 9c, 9d. Further, by providing valves on the branch pipes 9a, 9b, 9c, 9d, respectively, ice / water slurry is supplied from the small water tank located on the upstream side, and as the ice volume of each small water tank becomes almost full,
It is also possible to sequentially supply ice / water slurry to a small water tank located on the downstream side.

On the other hand, when recovering the heat storage water from each small water tank in which cold heat is stored as the ice water phase in this way,
According to the present invention, since the carrier pipe 10 is connected in parallel to each small water tank as described above, the branch pipes 11a, 11b, 1
It is possible to collect uniformly from each small water tank via 1c and 11d. As in the conventional system as shown in FIG. 3, when the small water tanks are connected in series by communication pipes, in order to efficiently circulate the heat storage water, a large number of recovery pipelines are required. However, according to the present invention, the branch pipes 11a, 11b, 11 for collection are provided in each small water tank.
Since c and 11d are connected in parallel, even when a large amount of heat storage water is desired to be recovered, it is possible to recover much more easily and quickly than the conventional serial piping configuration. In addition, branch pipes 11a, 11b, which communicate with each small water tank,
It is also possible to adjust the amount of recovery from each small water tank by providing a valve means capable of opening and closing control on each of 11c and 11d.

In the illustrated example, each of the carrier pipes 6 or 10 is
And each branch pipe 9a, 9b, 9c, 9d or 11a, 11
Although b, 11c, and 11d are piped to the outside of each small water tank, it is also possible to pipe each pipe so as to communicate with each small water tank. It can be used efficiently.

It is also possible to arrange these small water tanks by utilizing the space of the double slab of the building. In the underground structure of a building, there may be a double slab structure in which the space between the upper slab and the lower slab is partitioned by a vertical wall, and the space surrounded by this concrete is usually a dead space. When the ice heat storage of the present invention is performed, if this space is used as a small water tank, concrete plays a role of a heat insulating wall, so that effective heat storage is possible and the dead space of the building can be utilized.

FIG. 2 shows still another embodiment of the present invention. This embodiment includes more small aquariums than shown in FIG. In such cases, multiple small water tanks should be grouped together to form several groups, and an ice / water slurry supply pipe and a heat storage water recovery pipe should be connected in parallel to each group. Is possible. In FIG. 2, a group including a plurality of small water tanks is indicated by reference numerals A, B, and C, and a main carrier pipe of ice / water slurry to each group is 20, and a branch pipe from the main carrier pipe 20 to each group. Are indicated by 21a, 21b, and 21c.
Similarly, the main carrier pipe 22 for collecting the heat storage water from each group is indicated by 22, and the branch pipes connecting the main carrier pipe 22 and each group are indicated by 23a, 23b, 23c. In the illustrated example, the small water tank is divided into three groups A, B, and C, but the number of groups can be appropriately selected according to the usage situation.

Although not shown in detail, in each group, each small water tank included in the group has both a supply pipe and a recovery pipe connected in parallel, as in the configuration shown in FIG. Since the circulation of the heat storage water in each group is almost the same as that in FIG. 1, detailed description thereof will be omitted here.

By thus connecting the supply pipe and the recovery pipe in parallel to each block, the ice / water slurry produced by the subcooler 2 and the vertical pipe 5 is uniformly supplied to each block. At the same time, the heat source water can be recovered from each block uniformly from each block, and the circulation efficiency of the heat storage water can be improved. Further, the valve means 25 is provided on each branch pipe of the supply pipe and the recovery pipe, and the opening degree thereof is adjusted so that the amount of ice / water slurry supplied to each block and the amount of heat source water recovered from each block are desired. It becomes possible to control according to. Furthermore, as in the case of FIG. 1, it is possible to connect each pipe so as to communicate with each small water tank, and by doing so, a more efficient use of the building space can be achieved. it can.

[0021]

As described above, according to the present invention, since the second pipe line system for collecting the heat storage water of the water phase separated from the ice by the ice filter is arranged in parallel, a large number of pipes are provided. Even when the heat storage system is composed of small water tanks, it is possible to uniformly collect the heat storage water from each small water tank.
In addition, the first for supplying ice / water slurry to each small water tank
Since the pipeline system of is also connected in parallel, ice in each small water tank
It is possible to store ice in water slurry uniformly. Also,
It is also possible to control the intake of water from each small water tank and the supply of ice / water slurry to each small water tank as desired by providing an appropriate valve means on a branch pipe communicating with each small water tank. As described above, according to the ice heat storage tank of the present invention, the heat storage water can be efficiently circulated, so that the heat storage efficiency can be improved.

Further, when the number of small water tanks increases,
According to another aspect of the present invention, the small water tank is divided into several blocks, and each block is connected by a parallel pipeline system, so that each block and its blocks are configured without piping a large number of pipelines. It is possible to uniformly supply ice / water slurry to each of the small water tanks, and it is possible to uniformly collect the heat storage water from each block and each small water tank that constitutes the block.

Further, according to the present invention, these pipes can be pierced through each small water tank, or the underground slab of the building can be used as a small water tank, so that the dead space of the building can be effectively used. Can be used for.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a first embodiment of an ice heat storage tank according to the present invention.

FIG. 2 is a schematic diagram showing the configuration of another embodiment of the ice heat storage tank according to the present invention.

FIG. 3 is a schematic diagram showing a configuration of a conventional ice heat storage tank.

[Explanation of symbols]

1a, 1b, 1c, 1d Small water tank 2 supercooler 3 pumps 4 carrier tubes 5 vertical pipes 6 Main carrier pipe 9a, 9b, 9c, 9d Branch pipe 10 Main carrier pipe 11a, 11b, 11c, 11d Branch pipe 12a, 12b, 12c, 12d Ice filter

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-1834 (JP, A) JP-A-4-295528 (JP, A) JP-A-4-155185 (JP, A) Actual development Sho-56- 42725 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 102 C09K 5/06 F28D 20/00

Claims (7)

(57) [Claims] 1. An ice heat storage tank for storing ice / water slurry as a heat source water for air conditioning, and supercooling which is installed outside the ice heat storage tank to cool water to a supercooling region. And a system for continuously passing the water in the ice heat storage tank into the subcooler to discharge the supercooled water from the discharge end of the subcooler, and the supercooled water as ice / water. An ice / water slurry conversion means for converting into a slurry and guiding it into the ice heat storage tank;
An ice heat storage tank comprising a system for guiding return water from a load side into the ice heat storage tank in order to defrost the ice / water slurry stored in the ice heat storage tank, wherein the ice heat storage tank is the same. It comprises a plurality of small water tanks installed at a height, and the ice / water slurry is converted from the ice / water slurry converting means into a bottom portion in each of the small water tanks via a first pipeline system connecting the respective small water tanks in parallel. while being dispensed from, provided above the ice nucleus separating means cold water from said each of the small water tank is provided in the upper tank through the second conduit system for connecting said each of the small water tank in parallel
An ice heat storage tank, characterized in that the ice heat storage tank is configured to be recovered from the taken water intake opening . 2. A first pipe line system and a second pipe line system for connecting the respective small water tanks in parallel are respectively composed of a main carrier pipe and a plurality of branch pipes communicating therewith to the respective small water tanks. The ice heat storage tank according to claim 1, wherein each branch pipe is provided with valve means capable of controlling opening and closing. 3. The ice heat storage tank according to claim 1, wherein the first and second pipeline systems are arranged so as to pass through the small water tanks. 4. The ice heat storage tank comprises a plurality of small water tanks, the plurality of small water tanks are divided into a plurality of blocks, and a first pipeline system and a second pipeline system are provided for each block. Then, the ice / water slurry converting means distributes the ice / water slurry to each block via a third pipeline system that connects the first pipeline systems of the blocks in parallel to each other, 4. The cold water is collected from each of the blocks via a fourth pipeline system that connects the second pipeline systems in parallel with each other, in any one of claims 1 to 3. Ice storage tank described in crab. 5. The third pipeline system and the fourth pipeline system for connecting each of said blocks in parallel, respectively, is composed of a plurality of branch pipes to the pipe in each block and from there the main conveying pipe, each The ice heat storage tank according to claim 4, wherein the branch pipe is provided with valve means capable of opening and closing control. 6. The ice heat storage tank according to claim 4 or 5, wherein the third and fourth pipeline systems are arranged so as to pass through the small water tanks. 7. The ice heat storage tank according to claim 1, wherein the ice heat storage tank is a concrete space sandwiched between double slabs in a building.