JP3072138B2 - 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 a heat storage tank for use in regenerative cooling and heating, and more particularly, to a plurality of liquid tanks for storing a heat transfer medium which are arranged in a row to form a tank row. The liquid tanks of the same tank row are connected in series so that the heat medium flows from one end to the other end of the tank row, and these tank rows are connected to a heat medium liquid delivery path and a heat medium liquid return path. And a heat storage tank connected in parallel.

[0002]

2. Description of the Related Art Conventionally, in a heat storage tank as described above, as shown in Japanese Patent Application Laid-Open No. 2-85642, liquid tanks having the same order of arrangement in adjacent tank rows (adjacent liquid tanks in the tank row juxtaposition direction). ) Are communicated with each other through openings formed in partition walls between the liquid tanks, so that the liquid level of the liquid tanks is equal among the plurality of tank rows regardless of the variation in the flow rate of the heat medium liquid to each tank row. In some cases, the storage efficiency of the heat medium liquid as a whole of the heat storage tank (the ratio of the effective heat medium liquid storage amount to the tank volume), and thus the heat storage capacity, is increased.

[0003]

However, in the above-described conventional heat storage tanks, the liquid level of the liquid tanks can be made equal among a plurality of tank rows arranged in parallel, but the heat transfer medium flowing into each tank row is heated by the heat transfer medium. Each of the tank rows may be used to prevent variations in the flow resistance of the heat transfer fluid in the portion distributed from the liquid return path, and variations in the flow resistance of the heat transfer liquid in the section in which the heat transfer liquid delivered from each tank row is collected into the heat transfer path. There is no function to adjust the flow rate of the heat medium liquid to the flow rate according to the tank volume of each tank row (the capacity of the liquid tank series connection group in each tank row). The moving speed in the tank row at the region boundary between the liquid medium and the stored heat transfer medium to be sent to the heat transfer liquid delivery path differs between a plurality of tank rows, and in a certain tank row, the transfer speed to the heat transfer liquid delivery path is different. Even if the heat storage liquid in the heat storage state to be discharged no longer remains, it should be delivered to the heating medium delivery path in other tank rows. The heat storage liquid in the heat storage state still remains, and the amount of heat stored in the remaining heat medium cannot be used effectively. In this respect, the effective utilization rate of the heat storage amount (the amount of heat that can be effectively taken out and used out of the total heat storage amount) Ratio is still low.

Further, the temperature distribution state of the stored heat transfer fluid in the tank row by the heat transfer liquid flowing from the liquid tank of the adjacent tank row through the opening portion (particularly, a method in which the heat transfer medium is stored in a temperature stratified state). Temperature distribution state) is disturbed, which causes a problem that the loss of heat storage amount (so-called mixing loss) increases.

A main object of the present invention is to provide a heat storage tank of the type in which a plurality of liquid tanks connected in series are connected in parallel to a heat medium liquid delivery path and a heat medium liquid return path. The point is to solve the problem effectively.

[0006]

According to a first feature of the present invention, a plurality of liquid tanks for storing a heat transfer medium are arranged in a row to form a tank row, and a plurality of the tank rows are arranged in parallel. The liquid tanks in the same tank row are connected in series so that the heat medium flows from one end to the other end of the tank row, and these tank rows are connected to the heat medium liquid delivery path and the heat medium liquid return path. In the heat storage tanks connected in parallel, a flow control valve for individually adjusting the flow rate of the heat medium liquid to each tank row is provided.

A feature of the invention according to claim 2 is that, in the embodiment of the invention according to claim 1, an automatic constant flow valve is used as the flow control valve.

According to a third aspect of the present invention, in the first or the second aspect of the invention, the first wall body is located on the high-temperature heat transfer medium storage side and has a communication opening at the lower end. A second wall body that is located on the storage side of the low-temperature heat medium liquid and forms a heat medium liquid overflow section at the upper end, and the first wall body in a state where a communication opening is formed in the upper and lower middle part. The third wall positioned between the second wall and the third wall constitutes a weir structure for partitioning the tank, and this weir structure is disposed between adjacent liquid tanks in the same tank row, and a plurality of dams in the same tank row are arranged. That is, the liquid tanks are partitioned in a serially connected state.

[0009]

According to the first aspect of the present invention, in a configuration in which a plurality of tank rows are connected in parallel to the heat medium liquid return path and the heat medium liquid delivery path, the flow rate of the heat medium liquid for each tank row is individually adjusted. The flow rate of the heat medium in each of the plurality of tank rows is controlled by the flow rate adjustment valve to the capacity of each tank row (the capacity of the liquid tank series connection group in each tank row).
The flow rate in the tank row at the boundary between the storage heat medium refluxed from the heat medium liquid return path and the storage heat medium liquid to be sent to the heat medium liquid delivery path can be adjusted. Can be made equal between the plurality of tank rows, and in these plurality of tank rows, the delivery of the stored heat transfer medium in the heat storage state to the heat transfer medium delivery path can be completed almost simultaneously.

That is, this causes a problem in the above-described conventional heat storage tank, that is, in a certain tank row, the heat storage liquid in the heat storage state to be sent to the heat medium liquid delivery path does not already remain, but the other heat storage tank remains. In the row, the heat storage liquid in the heat storage state to be sent to the heat medium liquid delivery path remains in a state, and the problem that the heat storage amount of the remaining heat medium liquid cannot be used effectively can be effectively avoided. The total amount of heat stored in the heat storage tank composed of the tank rows can be used more effectively.

In addition, the flow rate of the heat medium in each tank row can be adjusted to a flow rate corresponding to the tank volume of each tank row. It is also possible to equalize the liquid level in the plurality of tank rows while eliminating the need for openings communicating with each other), to increase the storage efficiency of the heat transfer fluid, and thus to increase the efficiency of the tank rows. By eliminating the need for an opening communicating with the adjacent liquid tanks in the installation direction, another problem in the above-described conventional heat storage tank, namely, by the heat transfer medium flowing from the liquid tank of the adjacent tank row through the opening. The problem that the temperature distribution state of the stored heat transfer fluid in the tank row is disturbed and the loss of heat storage amount (mixing loss) increases can also be effectively avoided.

According to the second aspect of the present invention, by using an automatic constant flow rate valve as the flow rate regulating valve, the flow rate of the heat medium in each tank row can be reduced while eliminating the need for manual valve operation. , And the adjusted flow rate can be maintained irrespective of a change in the flow resistance of the heat medium liquid.

In the invention according to claim 3, when a plurality of liquid tanks are formed by using the walls and beams in the underground double slab structure as the tank walls, the formation of openings in the walls and beams is limited. However, by making those walls and beams the third wall,
While the openings formed in the walls and beams are only the communication openings at the upper and lower middle portions, the flow of the heat medium between adjacent liquid tanks in the same tank row through the communication openings at the upper and lower middle portions is performed by the third wall. A communication opening formed at the lower end of the first wall body located on the storage side of the high-temperature heat transfer fluid with respect to the body, and a second opening located on the storage side of the low-temperature heat transfer fluid with respect to the third wall body. By performing the heating medium liquid overflowing portion formed at the upper end of the wall, the heating medium liquid can be stored in a temperature stratified state in each of the liquid tanks, thereby suppressing so-called mixing loss. As a result, the heat storage efficiency can be increased.

In the case where a plurality of liquid tanks are formed by using walls and beams in the underground double slab structure as tank walls,
One end of the high-temperature heat transfer medium is used to allow the heat transfer liquid to be stored in a temperature stratified state in each of the adjacent liquid tanks in the same tank row while the openings formed in the walls and beams are only the openings in the upper and lower middle parts. A type in which an S-shaped communication pipe that opens to the bottom of the tank on the storage side of the tank and the other end opens to the top of the tank on the storage side of the low-temperature heat transfer medium, and penetrates through the upper and lower intermediate portions of the beams and walls ( Although the above-mentioned Japanese Patent Application Laid-Open No. 2-85642 is also conceivable, in this type, the flow rate of the heat medium liquid at the pipe end opening of the S-shaped communication pipe becomes high, so that the temperature stratified state in each liquid tank is increased. The formation is likely to be incomplete.

On the other hand, if the storage of the heat transfer medium in each liquid tank is made into a temperature stratified state by the first wall and the second wall constituting the weir structure, the lower end of the first wall is formed. The opening width of the communication opening formed in the portion, and the width of the heat medium liquid overflow portion formed in the upper end portion of the second wall body can be made large,
By reducing the flow rate of the heat transfer fluid at the communication openings and the overflow portion of the heat transfer fluid, it is possible to make the formation of a temperature stratified state in each of the liquid tanks more nearly perfect and good. S
The heat storage efficiency can be more effectively improved by the formation of the temperature stratified state, as compared with the type using the letter-shaped communication pipe.

[0016]

According to the first aspect of the present invention, in the plurality of tank rows connected in parallel to the heat medium liquid return path and the heat medium liquid discharge path, the stored heat medium liquid in the heat storage state is discharged. Can be almost simultaneously completed, the effective utilization rate of the heat storage amount can be increased, and the temperature distribution state of the storage heat medium liquid is stably maintained, and the loss of the heat storage amount (mixing loss)
In addition, it is possible to increase the storage efficiency of the heat medium liquid by equalizing the liquid tank liquid level among the plurality of tank rows while suppressing the heat tank. In these respects, it is possible to make the heat storage tank more excellent than the conventional heat storage tank described above. it can.

The advantage of the type in which a plurality of tank rows formed by connecting a plurality of liquid tanks in series are connected in parallel to the heat medium liquid return path and the heat medium liquid discharge path, that is, as shown in FIG. The heat transfer liquid W is formed in a meandering manner from the end liquid tank 1a of the one end tank row La to which the liquid recirculation path 3 is connected to the end liquid tank 1x of the other end tank row Lx to which the heat medium liquid delivery path 2 is connected. Like flowing
Compared to a type in which all the liquid tanks 1a to 1x are connected in series to the heat medium liquid return path 3 and the heat medium liquid discharge path 2, the heat medium liquid flow resistance in the heat storage tank can be reduced, The power required for liquid circulation can be reduced, and the difference in liquid level between the end liquid tank on the heat medium liquid recirculation side and the end liquid tank on the heat medium liquid delivery side in the heat storage tank can be reduced. Combined with the advantage that a large effective heat medium liquid storage amount can be secured, an extremely excellent heat storage tank can be provided.

According to the second aspect of the present invention, the burden on maintenance can be reduced by eliminating the need for manual valve operation, and the heat transfer fluid in each tank row can be changed regardless of the change in the flow resistance of the heat transfer fluid. Since the flow rate can be automatically adjusted and maintained at a flow rate corresponding to the tank volume of each tank row, the effect of the invention according to claim 1 can be continuously and more reliably obtained.

According to the third aspect of the present invention, when a plurality of liquid tanks are formed by using the walls and beams in the underground double slab structure as tank walls, it is limited to form openings in the walls and beams. On the other hand, it is possible to store the heat transfer medium in a good temperature stratified state in each of the adjacent liquid tanks in the same tank row, while making only the openings formed in the upper and lower middle portions of the walls and beams. Thus, the heat storage efficiency can be effectively improved.

[0020]

Next, an embodiment will be described.

FIG. 1 shows a heat storage tank 1 composed of a large number of water tanks 1a to 1c. A plurality of water tanks 1a to 1c are arranged in a row to form a tank row L. is there.

The water tanks 1a to 1c of the same tank row L are connected in series so that stored cold water W as a heat transfer medium flows from one end of the tank row L to the other end thereof.
Are connected in parallel to a chilled water delivery path 2 which is a heating medium liquid delivery path and a chilled water reflux path 3 which is a heating medium liquid reflux path.

That is, by connecting the plurality of tank rows L in parallel to the chilled water delivery path 2 and the chilled water return path 3 as described above, all of the large number of water tanks 1a to 1c are connected to the chilled water delivery path 2 and the chilled water return path. 3, the heat storage tank 1
The cold water flow resistance as a whole is reduced, and the water level difference between the upstream end and the downstream end of the heat storage tank 1 in the cold water flow direction is reduced.

As shown in FIG. 2, the chilled water delivery path 2 is used to supply the chilled water W stored in the heat storage tank 1 to a chilled heat
The cold water recirculation path 3 is a flow path for returning the cold water W used in the cold heat consuming device 4 to the heat storage tank 1.

The formation structure of the water tanks 1a to 1c in each tank row L, and the series connection structure, are located on the upstream side in the flowing direction of the stored cold water W (in other words, on the storage side of the high-temperature cold water W) and have a lower end. A first wall body 6 that forms a communication opening 5 with the first cooling water W, and a first water body 7 that is located downstream (in other words, the storage side of the low-temperature cold water W) in the flow direction of the stored cold water W and forms a cold water overflow section 7 at the upper end. 2
The wall 8 constitutes a weir structure 9 for partitioning the tank, and the weir structure 9 is positioned between the adjacent water tanks 1a to 1c, and the water tanks 1a to 1c are partitioned and formed in series.

The connection structure between the water tank 1a at the upstream end of each tank row L and the chilled water return passage 3 and the connection structure between the water tank 1c at the downstream end of each tank row L and the chilled water delivery path 2 With regard to the above, the heat storage tank connecting portions in each of the cold water return path 3 and the cold water delivery path 2 are formed by header structures 3h and 2h, and the header structure 3h in the cold water return path 3 and the upstream end of each tank row L The water tank 1a is connected via a single pipe 10, and the header structure 2h in the cold water delivery path 2 and the water tank 1c at the downstream end of each tank row L are connected via a single pipe 11.

An upstream end wall 13 having the same configuration as the second wall 8 and forming a cold water overflow portion 12 at the upper end is provided on the single pipe connecting side of the water tank 1a at the upstream end of each tank row L. A water tank 1c at the downstream end of each tank row L
, A downstream end wall 15 having the same configuration as the first wall 6 and having a communication opening 14 at the lower end is provided on the single pipe connection side.

That is, due to the partitioning of the water tank by the weir structure 9 and the arrangement of the upstream end wall 13 and the downstream end wall 15 in the end water tanks 1a and 1c, the stored cold water W is indicated by the arrow in the figure. Is caused to flow, thereby maintaining a large cold water temperature difference between the upstream end and the downstream end of the tank row L while keeping the cold water storage state in each of the water tanks 1a to 1c in a temperature stratified state.

A flow control valve 16 and a flow meter 18 are provided in each of the single pipes 10 connecting the header structure 3h in the cold water recirculation path 3 and the water tank 1a at the upstream end in each tank row L. Each of the single pipes 11 connecting the header structure 2h in the cold water delivery path 2 and the water tank 1c at the downstream end in each tank row L is provided with a flow control valve 17 (not shown, but a cold water delivery path). The flow meter 1 is also connected to the connection end pipe 11 on the second side.
8 may be attached), and based on the flow rate measurement by the flow meter 18, each tank row L is controlled by each of the flow control valves 16 and 17.
(In this example, the amount of cold water flowing through each tank row L is equalized while the tank rows L have the same specifications in this example).

When a plurality of tank rows L in which a plurality of water tanks 1a to 1c are connected in series are connected in parallel to the chilled water delivery path 2 and the chilled water recirculation path 3, a heat storage tank configuration is required. The number of water tanks 1a to 1c in the tank row L is larger than the number of water tanks connected in series, thereby reducing the cold water flow resistance in the heat storage tank 1 and the difference in water level between the upstream end and the downstream end in the heat storage tank 1. The reduction is to be achieved more effectively.

The number of water tanks 1a to 1c connected in series in each tank row L is three or more, and cold water storage is performed without being affected by cold water delivery to the cold water delivery path 2 or cold water inflow from the cold water return path 3. By securing the water tank 1b in a stable state at the middle part of the cold water flow path of each tank row L, the heat storage efficiency of the entire heat storage tank is kept high.

In the figure, reference numeral 19 denotes a refrigerator.
The chilled water discharge path 20 is connected to the chilled water delivery path 2, and the chilled water return path 21 to the refrigerator 19 is connected to the chilled water return path 3.

That is, at the time of cold heat storage operation for the heat storage tank 1, the header structure 2h of the cold water delivery path 2 in each tank row L
The cold water W is circulated between the heat storage tank 1 and the refrigerator 19 in the form of flowing the cold water W toward the header structure 3h of the cold water return path 3, and the low-temperature cold water W generated by the refrigerator 19 is stored in the heat storage tank 1. .

Reference numeral 22 denotes a bypass for joining a part of the low-temperature chilled water W discharged from the refrigerator 19 to the chilled water return passage 21, and adjusting the combined flow rate by the three-way valve 23 to return the chilled water to the refrigerator 19. Adjust the temperature to the desired temperature.

In the figures, 24 and 25 are pumps, respectively.

Next, another embodiment will be described.

(A) In the above-described embodiment, cold water is used as the stored heat medium liquid W. However, the heat medium liquid W may be hot water or a liquid other than water.

In each of FIGS. 1 and 2 described above and FIGS. 3, 4 and 5 described below, arrows indicating the flow of the heat medium liquid W indicate cold water as the heat medium liquid W in the heat storage tank 1. In the form of storage, the flow direction in the cold energy consumption operation in which the heat storage cold heat of the heat storage tank 1 is taken out and consumed is shown, and in the cold heat storage operation in which the cold heat is stored in the heat storage tank 1, the flow direction is opposite to the flow direction. In the mode in which hot water is stored in the heat storage tank 1 as the heat medium liquid W, the flow direction during the heat consumption operation in which the heat storage heat of the heat storage tank 1 is taken out and consumed is opposite to the flow direction during the cold heat consumption operation in the cold water storage mode. Orientation, and heat storage tank 1
The flow direction at the time of the heat storage operation in which the heat is stored is also opposite to the flow direction at the time of the cold heat storage operation in the cold water storage mode.

(B) Liquid tanks 1 connected in series in the tank row L
Various configurations can be changed for the partition structures a to 1c.
As shown in FIG. 3, the liquid tanks 1 a to 3 have a weir structure 28 in which a third wall 27 having a communication opening 26 formed in the upper and lower middle part is disposed between the first wall 6 and the second wall 8. 1c may be partitioned in series connection state. In this structure, when a plurality of liquid tanks are formed by using the walls and beams in the underground double slab structure as tank walls, openings are formed in the walls and beams. However, by using the walls and beams as the third wall 27, the openings formed in the walls and beams are limited to the communication openings 26 at the upper and lower intermediate portions, and the same tank row L is formed. In each of the liquid tanks 1a to 1c, the heat medium liquid W can be stored in a good temperature stratified state.

As shown in FIG. 4, the first wall 6
The first wall is formed by partitioning the adjacent liquid tanks 1a and 1b in series connection with only the second wall body 8 and partitioning the adjacent liquid tanks 1b and 1c in series connection with only the second wall body 8 described above. The liquid tanks 1a to 1c may be partitioned and formed in series by using the bodies 6 and the second wall bodies 8 alternately.

(C) The number of liquid tanks 1a to 1c connected in series in the tank row L is not limited to three tanks, and the number of tank rows L arranged in parallel is also limited to the number of parallel arrangements in the above embodiment. Not something.

(D) As shown in FIG. 5, a plurality of heat storage tank structures 1A and 1B in which a plurality of tank rows L are connected in parallel to a heat medium liquid delivery path 2 and a heat medium liquid return path 3 are connected to a heat medium tank. The liquid delivery path 2 and the heat medium liquid return path 3 may be provided adjacent to each other while also serving as the same.

(E) An automatic constant flow valve may be used as a flow control valve for individually adjusting the flow rate of the heat medium liquid to each of the tank rows L. The flow rate of the heat medium liquid in the row L can be adjusted to a flow rate corresponding to the tank volume of each tank row L, and the adjusted flow rate can be maintained regardless of a change in the flow resistance of the heat medium liquid.

(F) Various configurations can be changed for the flow path structure of the heat medium liquid delivery path 2 and the heat medium liquid return path 3.

Incidentally, reference numerals are provided in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a plan view

FIG. 2 is a vertical sectional view of a tank row.

FIG. 3 is a vertical sectional view of a tank row showing another embodiment.

FIG. 4 is a vertical sectional view of a tank row showing another embodiment.

FIG. 5 is a plan view showing another embodiment.

FIG. 6 is a plan view showing a conventional example.

[Explanation of symbols]

 1a, 1b, 1c Liquid tank 2 Heat medium liquid delivery path 3 Heat medium liquid return path L Tank line W Heat medium liquid 16, 17 Flow control valve 5 Communication opening 6 First wall 7 Heat medium liquid overflow 8 2 wall body 26 communication opening 27 third wall body 28 weir structure

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-85642 (JP, A) JP-A-3-255831 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 5/00

Claims (3)

(57) [Claims] 1. A liquid tank (1a) for storing a heat medium (W),
A plurality of tanks (1b) and (1c) are arranged in a row to form a tank row (L). A plurality of the tank rows (L) are arranged in parallel, and the liquid tanks (1a), (1b), (1
c) are connected in series so that the heat medium flows from one end of the tank row (L) to the other end, and the tank rows (L) are connected to the heat medium liquid delivery path (2) and the heat medium liquid return path. A heat storage tank connected in parallel to (3) , wherein the flow of the heat medium liquid flowing through each tank row (L) is individually adjusted.
A heat storage tank provided with quantity regulating valves (16) and (17) . 2. The flow control valve (16), (17)
2. The heat storage tank according to claim 1, wherein a variable flow rate valve is used . 3. A high temperature heat transfer medium storage side which is located at a lower end thereof.
A first wall (6) forming a communication opening (5), and a low-temperature heat
A heating medium overflowing portion (7) is located at the upper end of the storage medium storage side.
A second wall body (8) to be formed, and a communication opening in an upper and lower middle part
With the (26) formed, the first wall (6) and the
With the third wall (27) located between the two walls (7)
A weir structure (28) for tank partitioning is formed, and this weir structure (28) is connected to an adjacent liquid tank in the same tank row (L).
(1a), (1b) and (1c)
The plurality of liquid tanks (1a), (1b), (1) in (L)
3. The heat storage tank according to claim 1, wherein c) is partitioned in a series connection state .