JP3266334B2 - Heat storage tank for air conditioning - 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 in which heat source water for air conditioning is stored in the form of ice coexistence.
The present invention relates to a pipe type heat storage tank.

[0002]

2. Description of the Related Art Conventionally, when cooling and heating by circulating cold and hot water through a water-side heat exchanger of a fan coil unit or a water heat source heat pump unit disposed in a building, the cooling heat during cooling is stored in a heat storage tank. There has been proposed a heat storage system using a so-called ice heat storage method for storing in the form of ice. According to such a system, for example, ice is driven by driving a refrigerator with nighttime electric power, a large amount of cold heat is stored in a heat storage tank in the state of ice, and during cooling operation, the cold heat of the ice is taken out as cold water and the secondary heat is removed. Since it circulates through an exchanger (load-side heat exchanger) and utilizes latent heat during the solid-liquid phase transformation of water, even small-scale devices can store a large amount of cold heat, and thus have attracted particular attention in recent years.

[0003] More recently, a large-scale heat storage system using a so-called multi-tank type heat storage tank as a cold / hot water tank, which is composed of a large number of tanks utilizing underground slabs and the like, and the tanks are successively communicated with each other by a communication pipe to flow water. Equipment has also been proposed.

In the above-described ice heat storage system, the heat source water is circulated. For example, at the time of ice storage, water is taken from any position of the ice heat storage tank to form the ice / ice.
The location from which the water slurry is released into the ice thermal storage tank is a very important issue in increasing the ice filling rate and thermal efficiency of the ice thermal storage tank. Similarly, when deicing, the location of the ice / water slurry taken out of the ice thermal storage tank and the location of the circulating water for deicing are also very important for improving the defrosting rate and thermal efficiency. This is an important issue.

[0005] However, ideal water intake and water supply positions are completely different between ice storage and ice thawing. That is,
At the time of ice storage, it is preferable to take water from a portion where an aqueous phase is formed in the ice thermal storage tank and supply ice / water slurry directly to the ice / water phase. Therefore, the water intake is installed in the water phase, and the ice / water slurry supply port is installed in the ice water phase. On the other hand, at the time of thawing, in order to promote the melting of ice, it is preferable that return water from the load side is supplied from above, and the ice / water slurry conveyed to the load side is obtained directly from the ice-water phase. Therefore, a structure is adopted in which the water supply port is installed as high as possible in the heat storage tank, and the ice / water slurry acquisition port is directly opened to the ice-water phase.

As described above, in the conventional system, complicated piping must be constructed in order to optimally drive the system at the time of ice storage and at the time of thawing, respectively, and the construction amount and construction cost increase. There was a disadvantage. Such a drawback was particularly serious in a multi-tank heat storage system using a plurality of heat storage tanks.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ice water storage system that can be used for both ice storage and thawing. It is an object of the present invention to provide a new and improved ice storage tank structure capable of forming a phase at a high ice filling rate and melting the ice at a high melting rate during thawing.

Still another object of the present invention is to provide a new and improved ice heat storage tank structure capable of uniformly and quickly melting ice stored in an ice storage tank, especially during melting of ice. It is to be.

Further, another object of the present invention can be suitably applied particularly to a multi-tank type heat storage system composed of a plurality of ice heat storage tanks, and can be applied to both ice storage and ice melting. Another object of the present invention is to provide a new and improved ice heat storage structure capable of efficiently circulating heat storage water.

[0010]

According to the present invention, there is provided an ice storage device for separating ice and water in a heat storage tank.
It is higher than this ice filter
Forms an aqueous phase that stores water, and is lower than the ice filter.
Air-conditioning ice that forms an ice-water phase that stores ice and water in the ice
A heat storage tank that opens into the aqueous phase above the ice filter.
A first line system having an end and ice below the ice filter;
A second pipeline system with an open end in the water phase is provided.
Water intake from the open end of the first pipeline system and the open end of the second pipeline system
Introduce ice / water slurry into the tank from
Intake of water from the open end of the second pipeline system and opening of the first pipeline system
Air conditioning characterized by introducing water back into the tank from the end
Provide an ice thermal storage tank. More specifically, an ice heat storage tank for storing ice / water slurry as a heat source water for air conditioning, and a supercooling tank capable of cooling water, which is installed outside the ice heat storage tank and passes through water, to a supercooling area. A cooler, a system for continuously flowing water in the ice heat storage tank into the subcooler, and discharging supercooled water from a discharge end of the supercooler,
Ice for converting into water slurry and leading into the ice heat storage tank;
A water slurry converting means, and a system for guiding return water from the load side into the ice heat storage tank to deice the ice / water slurry stored in the ice heat storage tank, An ice filter that bounds an ice water phase for storing ice / water slurry and a water phase for storing water extends horizontally in the ice heat storage tank, and has an opening above the ice filter at a predetermined interval. And a second pipe system having an opening below the ice filter at a predetermined interval from the ice filter, and the first and second pipe systems are supercooled during ice storage. Side, the water is recovered from the first pipeline system and sent to the supercooler, and the second pipeline system is connected to the ice / water slurry converting means, and the second
The ice / water slurry can be introduced into the ice heat storage tank through the pipeline system described above, and when the ice is defrosted, the first and second pipeline systems are switched to the load side, and the first pipeline system is switched to the load side. And introducing return water from the load side into the ice heat storage tank through
An ice heat storage tank for air conditioning is provided, wherein cooling water can be recovered from the second pipeline system and sent to the load side.

[0011]

Further , according to the present invention, by applying the above-mentioned ice storage tank for air conditioning to a multi-tank type ice storage system,
The ice heat storage tank is composed of a plurality of small water tanks, the first pipe systems of each small water tank are connected in parallel, and the second water tank of each small water tank is connected.
Characterized by being connected in parallel with each other,
An ice storage tank for air conditioning is provided. Further , an ice heat storage tank for air conditioning is provided, wherein both the first and second pipeline systems are piped so as to penetrate each small water tank.

[0013]

According to the first aspect, the water phase and the ice-water phase are divided by the ice filter, and the first phase is opened to the water phase during ice storage.
Ice / water slurry can be provided from a second pipeline system opening to the ice-water phase portion, and ice can be supplied from the second pipeline system opening to the ice-water phase portion at the time of thawing. -Since the water slurry is obtained and water is sprinkled from the water phase portion, that is, the first pipeline system opened at the upper part of the ice heat storage tank, the heat storage water can be efficiently circulated. In this way, the same pipeline system can be shared both during ice storage and during thaw,
Piping volume and piping costs can be reduced.

[0014]

According to the third and fourth aspects, the ice heat storage tank structure according to the present invention can be used in a multi-tank type ice heat storage system, and according to the present invention, not only inside each tank but also each tank Since the heat storage water is circulated efficiently between
The non-uniformity of the filling rate and melting rate of ice in each tank can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an ice storage tank for air conditioning according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 are explanatory diagrams in the case where an air-conditioning ice heat storage tank according to the present invention is applied to a multi-tank type ice heat storage system having three tanks. FIG. 1 shows an operation during ice storage, and FIG. This shows the operation at the time of melting ice. The components shown in FIGS. 1 and 2 are the same multi-tank type ice thermal storage system, and the same components are denoted by the same reference numerals. FIGS. 3 and 4 are enlarged sectional views showing the upper part of the air-conditioning ice heat storage tank according to the present invention. As in FIGS. 1 and 2, FIG. Shows the operation at the time of melting ice.

The illustrated multi-tank ice heat storage system includes three ice heat storage tanks 1a, 1b, and 1c for storing ice / water slurry as heat source water for air conditioning. Further, a subcooler 2 is installed outside the ice heat storage tank, and a pump 3
Thus, the heat source water in the tank can be cooled to a supercooled region of 0 ° C. or less. The supercooler 2 is composed of, for example, a shell-and-tube heat exchanger in which a number of heat transfer tubes (tubes) are disposed in a shell. The supercooled water 4 is controlled so as to be maintained at a temperature equal to or higher than 0 ° C., whereby the supercooled water 4 cooled to 0 ° C. or lower is discharged from the discharge port, and the discharged supercooled water 4 falls into the vertical pipe 5.

The vertical pipe 5 is a vertical pipe having an inner diameter sufficient to receive the supercooled water discharge flow 4, and has an opening formed at its upper end with a divergent receiving portion. Communicates with the transfer pipe 7 through the valve 6. Further, the transport pipe 7 is provided with branch pipes 8a, 8b, 8c that open downward in each of the ice heat storage tanks 1a, 1b, 1c. In this manner, the ice / water slurry generated by the impact when the supercooled water discharged from the supercooler 2 falls into the vertical pipe 5 keeps the flowing state while maintaining the flowing state. 8a, 8b, 8c, each ice thermal storage tank 1
a, 1b, and 1c. Branch pipes 8a, 8b, 8
The ice / water slurry introduced from c rises according to its specific gravity and forms an ice-water phase.

Further, ice filters 9a, 9b and 9c are stretched in the horizontal direction above the ice storage tank according to the present invention. The ice filters 9a, 9b, 9c demarcate the ice water phase and the water phase. As described later, when water is taken during ice storage, the ice filters 9a, 9b, 9c use the ice filters 9a, 9b, 9c to separate ice from water / ice slurry. 10a, 10b, and 10c are separated and collected, and only water is supplied to the branch pipe 11 of the transport pipe 12.
a, 11b, and 11c. Further, the transfer pipe 12 communicates with the subcooler 2 via the valve 13 and the pump 3, and when storing ice, heat transfer water taken from the branch pipes 11 a, 11 b, 11 c can be sent to the subcooler 2. It is possible.

As shown in FIGS. 1 and 2, branch pipes 11a and 11b branching from the transport pipe 12 are provided.
b and 11c are openings 23 above the ice filter.
a, 23b, and 23c, whereas the branch pipes 8a, 8b, and 8c that branch from the transport pipe 7 have openings 24a, 24b, and 24c below the ice filter. With this configuration, the branch pipe 11a,
11b and 11c have openings 23a and 23 only for the aqueous phase.
b, 23c and branch pipes 8a, 8b, 8
c are openings 24a, 24b, 24c only for the ice-water phase
Will have.

The conveying pipes 7 and 12 are also provided with valves 14, 15
The pump 16 also communicates with the load 16 via a pump 17.
As described later, by appropriately switching the valves 6, 13, 14, and 15, the transfer pipes 7 and 12 are connected to the pipe system 18 or 19 on either the load 16 side or the subcooler 2 side. The heat source water is selectively circulated in either the load-side pipeline system 19 or the subcooler-side pipeline system 18 in accordance with the operation mode of the system (ice storage operation or de-icing operation). It is possible.

Since the air-conditioning ice heat storage tank according to the present invention is configured as described above, it can be operated in two operation modes of ice storage operation or ice-thaw operation as described below. .

(1) Ice Storage Mode When the ice storage mode is selected in which the heat storage water is stored in an ice / water slurry state in the ice storage tank using inexpensive nighttime electric power, the valve 14, the valve 14, as shown in FIG. The valve 15 is closed, the valves 6 and 13 are opened, and a pipeline system for ice making is formed by the transport pipes 7, 12, and 18, and the ice storage operation is performed.

The water intake from the ice thermal storage tanks 1a, 1b, 1c
It is performed from the branch pipes 11a, 11b, 11c that open above the ice filters 9a, 9b, 9c. As shown in FIG. 3, since the ice 10a is separated and collected from the ice water phase by the ice filters 9a, 9b, 9c, the branch pipe 11a,
From the openings 23a, 23b, 23c of 11b, 11c, only the heat storage water in the aqueous phase is taken. The stored heat storage water is
The water is sent to the subcooler 2 by the pump 3 via the transfer pipe 12 and the valve 13, and is cooled to a subcooling area. As already described, the supercooled water 4 cooled by the supercooler 2 is converted into ice / water slurry by the vertical pipe and sent to the transport pipe 7 through the valve 6. The ice / water slurry is introduced into the ice heat storage tanks 1a, 1b, and 1c from the branch pipes 8a, 8b, and 8c of the transfer pipe 7, and stored in the tanks.

In this case, the openings 24a, 24b, 24c of the branch pipes 8a, 8b, 8c are respectively
Since the openings are opened below a, 9b, and 9c, the ice portions 10a, 10b, and 10c of the ice / water slurry are stored only below the ice filters 9a, 9b, and 9c. Further, the ice / water slurry is applied to the ice filters 9a and 9a.
When passing through b and 9c, the collected ice is compressed toward the ice filters 9a, 9b and 9c by the increase of the permeation pressure (water flow resistance) accompanying the collection of ice and the buoyancy of the ice itself. Therefore, the ice filling rate increases. Also, the ice filters 9a, 9b, 9
c, ice is collected where water easily passes, and as a result, ice filters 9a, 9b, 9c
An ice phase having a uniform thickness is formed on the surface of the substrate.

(2) Thawing Mode When the thawing operation is performed to use the ice / water slurry stored in the ice storage mode as a heat storage source, FIG.
As shown in the figure, the valves 6 and 13 are closed and the valves 14 and 15 are closed.
Is opened, and a pipeline system for deicing is formed by the transport pipes 7, 19, and 12.

The intake of the heat storage water from the ice heat storage tanks 1a, 1b, 1c is performed in the opposite manner to the above-described ice storage mode, by branch pipes 8a, 8b.
This is performed from the openings 24a, 24b, 24c of the b, 8c. As described above, since the openings 24a, 24b, 24c are opened below the ice filters 9a, 9b, 9c, heat source water having high cooling efficiency only from the ice water phase is passed through the valve 14 through the heat exchanger. And the like.

The heat source water heated and exchanged by the load 16 is sent to the transfer pipe 12 through the valve 15 by the pump 17. The hot water returned from the load side is supplied to the ice heat storage tank from the branch passages 11a, 11b, 11c of the transfer pipe 12, and the ice 10a collected below the ice filters 9a, 9b, 9c,
10b, 10c can be used to melt. This will be described with reference to FIG. Opening 23a of branch pipe 11a opening above ice filter 9a
Sprinkled from. As described above, when the ice is thawed, the return water from the load side from above the ice filters 9a, 9b, 9c is separated from the ice portion 10 separated by the ice filters 9a, 9b, 9c.
a, 10b, 10c can be melted.

In the above embodiment, the case where the air-conditioning ice heat storage tank according to the present invention is used in a multi-tank type ice heat storage tank system has been described. Needless to say, the same effect can be obtained even when used in an ice heat storage tank of a mold type.

FIG. 5 shows another embodiment of the ice heat storage tank for air conditioning according to the present invention. According to this embodiment, the perforated plate 26 in which a plurality of through holes 25 are drilled extends horizontally above the ice filter 9a. The opening 23a of the branch pipe 11a is provided at substantially the same position as the horizontal plane of the perforated plate. FIG. 5 shows the ice thermal storage tank 1a.
Although only the structure relating to the present embodiment is shown, when the present invention is applied to a multi-tank type ice heat storage system as shown in FIGS. 1 and 2, the structure of another ice heat storage tank can be similarly configured.

With such a configuration, particularly at the time of melting ice, the heat storage water supplied from the opening 23a of the branch pipe 11a can be evenly sprayed on the ice portion 10a below the ice filter 9a. It is possible to promote melting. That is, at the time of deicing, since the return water from the load side accumulates on the perforated plate, the water level 22 at the time of defrosting becomes higher than the water level 21 at the time of ice storage. Therefore, an air layer (gap) is formed between the perforated plate 26 and the ice filter 9a, and this gap promotes dispersion of the heat storage tank in which water is sprinkled, thereby increasing the melting speed of ice.

[0032]

As described above, according to the present invention, in the ice heat storage tank, the pipe system opening to the water phase portion and the pipe system opening to the ice water phase portion, which are configured as independent systems, respectively, It is possible to selectively switch to the subcooler side or the load side in accordance with the ice storage mode or the ice melting mode. That is, according to the present invention, since the water phase and the ice water phase are divided by the ice filter, by appropriately switching the first and second pipeline systems as described above, the water phase part is stored during ice storage. Water can be taken from the first pipeline system that opens to the ice water phase, and ice / water slurry can be provided from the second pipeline system that opens to the ice-water phase portion. Ice / water slurry is obtained from the pipeline system, and water is sprinkled from the aqueous phase portion, that is, the first pipeline system opened at the top of the ice thermal storage tank, so that the heat storage water can be efficiently circulated. As described above, since the same pipeline system can be shared both during ice storage and during ice-thaw, the amount of piping and the cost of piping can be reduced.

[0033]

Further, by using the above-described ice storage tank structure in a multi-tank type ice storage system, the heat storage water can be efficiently circulated between the tanks, and the ice filling rate and the melting rate of each tank can be improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an operation during ice storage of a multi-tank type ice heat storage system to which the present invention is applied.

FIG. 2 is a configuration diagram showing an operation of the multi-tank type ice heat storage system to which the present invention is applied when ice is thawed.

FIG. 3 is a schematic cross-sectional view showing an upper structure of an ice heat storage tank to which the present invention is applied when storing ice.

FIG. 4 is a schematic cross-sectional view showing an upper structure of an ice heat storage tank to which the present invention is applied when the ice is thawed.

FIG. 5 is a schematic sectional view showing a structure of an upper part of an ice heat storage tank according to another embodiment of the present invention.

[Explanation of symbols]

 1a, 1b, 1c Ice heat storage tank 2 Subcooler 3 Pump 5 Vertical pipe 6, 13, 14, 15 Valve 7, 12 Transport pipe 8a, 8b, 8c Branch pipe 9a, 9b, 9c Ice filter 11a, 11b, 11c Branch Tube 16 Load 23a, 23b, 23c Opening 24a, 24b, 24c Opening 26 Perforated plate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-137438 (JP, A) JP-A-2-97834 (JP, A) JP-A-4-363527 (JP, A) JP-A-6-634 117666 (JP, A) Special Table 62-500466 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00

Claims (3)

(57) [Claims] An ice filter for separating ice and water in a heat storage tank.
The water above the ice filter
To form an aqueous phase for storing
Ice thermal storage tank for air conditioning that forms an ice-water phase for storing water
Having an open end in an aqueous phase above the ice filter.
And the first pipeline system and the ice-water phase below the ice filter.
A second pipe system having an open end is provided, and the first pipe is used during ice storage.
Intake from the open end of the conduit system and a tank from the open end of the second conduit system
Introduce ice / water slurry into
Water intake from the open end of the pipeline system and from the open end of the first pipeline system
Ice storage for air conditioning characterized by introducing return water into the tank
Heat tank. 2. The ice thermal storage tank comprises a plurality of small water tanks, and first pipe systems of the small water tanks are connected in parallel, respectively.
The ice heat storage tank for air conditioning according to claim 1, wherein the second pipeline systems of the small water tanks are respectively connected in parallel. 3. The air-conditioning ice heat storage tank according to claim 2, wherein the first and second pipeline systems are piped so as to penetrate each small water tank.