JP2004093000A - Supply member for heat storage tank and method of operating ice heat storage system - Google Patents

Abstract

An ice storage having a high pressure density is provided in a heat storage tank for supplying sherbet-shaped ice into a heat storage tank during ice heat storage and supplying sensible heat water during sensible heat storage through the same pipe.
A tubular main body (31) attached to a supply pipe (16) for supplying sherbet-shaped ice into a heat storage tank. A first opening 32 is formed at the top of the main body 31, and a small hole 33 serving as a second opening is formed on a side surface of the main body 31. The passage resistance of the entire small hole 33 is equal to or higher than the head pressure from the small hole 33 to the first opening 32.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat storage tank supply member suitable for use in a so-called dynamic ice heat storage system, and a method for operating the ice heat storage system.
[0002]
[Prior art]
Although the ice thermal storage system can store heat at high density, the ice thermal storage system equipment may be suspended in winter, for example, depending on the demand for cold load. In such a case, if it can be used as a heat storage facility for cold water heat storage or even hot water heat storage, the equipment itself can be effectively used.
[0003]
In this regard, for example, in Japanese Patent No. 3300714, ice / water slurry is supplied to a heat storage tank of a dynamic ice heat storage system through a distributor provided below the surface of the heat storage tank during ice storage operation. On the other hand, it has been proposed to effectively use the heat storage tank of a dynamic ice heat storage system by supplying hot water into the water from near the water surface through the distributor when storing hot water.
[0004]
The distributor disclosed in the prior art has a structure in which a donut-shaped disk is attached to the tip of a supply port, and a disk having the same outer shape is attached above the disk. Due to the arrangement, sherbet-like ice in the form of ice / water slurry is discharged into the water from between the disks even during ice storage operation.
[0005]
[Problems to be solved by the invention]
However, if the sherbet-like ice in the form of ice / water slurry is discharged into the water from between the two disks located below the water surface, the discharged ice may block the discharge port between the two disks. In addition, there was a limit to the consolidation density during the process of ice storage, in which the separated ice part floated in the water, and gradually thereafter, the amount of latent heat to be stored was limited, and further improvement was expected.
[0006]
The present invention has been made in view of the above point, and provides sherbet-like ice into a heat storage tank during ice storage through the same pipe, and uses sensible heat water when the heat storage tank is used as a sensible heat storage tank. And a supply member for supplying ice with high density to the heat storage tank when ice is stored, and a supply member for the heat storage tank. It is an object of the present invention to provide an operation method of an ice heat storage system using the same.
[0007]
[Means for Solving the Problems]
To achieve the above object, according to claim 1, a supply member for supplying sherbet-like ice into a heat storage tank, the supply member being attached to a pipe for supplying the sherbet-like ice into the heat storage tank, A cylindrical body disposed vertically, a first opening formed at the top of the main body, and a second opening formed on a side surface of the main body; The supply member for a heat storage tank is provided, wherein a passage resistance of the section is equal to or higher than a water head pressure from the second opening to the first opening.
[0008]
Here, the fact that the passage resistance of the second opening formed at the top of the main body is equal to or higher than the head pressure from the second opening to the first opening means that the passage resistance is higher than the second opening. The difference in water level (head pressure) required to perform the operation is equal to or greater than the difference in water level (head pressure) from the second opening to the first opening. Such settings can be realized by adjusting the length of the portion, the opening area of the second opening, the opening ratio, and the like.
[0009]
When the supply member for a heat storage tank according to the present invention is used, it is used such that the first opening is positioned above the liquid level in the heat storage tank and the second opening is positioned below the liquid level. During storage of ice, such as during ice storage, sherbet-shaped ice is supplied through piping, and during storage of cold and hot water, cold or hot water for sensible heat is supplied through a pipe.
[0010]
By the way, comparing this type of heat storage tank with ice heat storage using latent heat and hot water heat storage using sensible heat, as shown in FIG. 1, the ratio of the amount of water circulating in the tank both during heat storage and heat release is, for example, as shown in FIG. It is extremely large at 90 to 110: 10. That is, in the case of ice heat storage, the flow rate is large, and in the case of hot water heat storage, the flow rate is about 1/10 of that.
[0011]
As described above, in the heat storage supply member of the present invention, since the passage resistance of the second opening is equal to or higher than the water head pressure from the second opening to the first opening, the transfer flow rate during ice heat storage is large. In this case, the sherbet-like ice is preferentially supplied from the first opening because the pressure loss when passing through the second opening is larger than the flow path to the upper first opening, that is, the head pressure. And is released into the heat storage tank. In this case, since it is released into the air and accumulates on the liquid surface, it is possible to realize high-density ice storage. Further, the possibility that the first opening is closed is greatly reduced as compared with the related art.
[0012]
On the other hand, since the flow rate is small when storing hot water, supplying hot water into the pipe at a flow rate that does not exceed the head pressure causes hot water to flow below the water surface in the heat storage tank from the second opening on the side surface of the main body. Therefore, it is possible to carry out the thermal stratification heat storage utilizing the density difference of the hot water.
[0013]
Moreover, in order to realize the above-mentioned operation, no artificial valve switching operation or the like is required.
[0014]
According to the present invention, there is provided a supply member for supplying sherbet-shaped ice into the heat storage tank, wherein the pipe member is attached to a pipe for supplying the sherbet-shaped ice into the heat storage tank, and is arranged vertically. , A first opening formed on the top of the main body, and a second opening formed on a side surface of the main body, wherein the second opening has a plurality of slits or small diameters. And a supply member for a heat storage tank, characterized in that the supply member comprises:
[0015]
When the heat storage tank supply member having such a configuration is used, similarly to the above heat storage tank supply member, the first opening is provided above the liquid level in the heat storage tank and the second opening is provided below the liquid level. Use it as it is positioned. During storage of ice, sherbet-shaped ice is supplied, and during storage of cold / hot water, cold or hot water for sensible heat is supplied through a pipe. At this time, when the sherbet-like ice is supplied, by setting the flow velocity to, for example, 1 m / s or more, the pressure loss when passing through the second opening increases the flow path to the upper first opening, that is, the water head. Then, the sherbet-like ice is ejected preferentially from the first opening and discharged into the heat storage tank. On the other hand, in the case of supplying cold water or hot water, sensible heat water flows out only from the second opening below the water surface in the heat storage tank by setting the flow rate to 1/10 or less, for example, 0.1 m / s or less. And does not disturb temperature stratification.
When the same heat storage tank is used, there is a difference in density between the ice / water slurry and the hot water. Therefore, as described above, when the flow rate in the case of ice heat storage is about 10 times the hot water heat storage, the flow rate of the ice / water slurry is about 10 times the flow rate of the hot water. However, the flow rate may be set to 5 times or more by selecting a punching plate and other resistance members.
[0016]
In these heat storage tank supply members, a horizontal plate may be provided around the lower side of the second opening in the main body, or another horizontal plate may be provided around the upper side of the second opening in the main body. For example, when hot water or the like flows out from the second opening, it becomes possible to uniformly diffuse the hot water and realize a suitable temperature stratification.
[0017]
According to the present invention, in the ice heat storage system configured to take water in the heat storage tank to generate sherbet-shaped ice and to supply the sherbet-shaped ice to the heat storage tank through the pipe, A heat storage tank supply member according to any one of claims 1 to 4, wherein a first opening of the heat storage tank supply member protrudes from a liquid level in the tank, and a second opening. When the supply member for the heat storage tank is positioned so that the ice is located below the liquid level in the tank and the sherbet-shaped ice is supplied, the sherbet-like ice is supplied from the first opening of the supply member for the heat storage tank. When the heat storage tank is used as a sensible heat storage tank, sensible heat water is supplied into the tank from the second opening of the heat storage tank supply member through the pipe. Operation of ice thermal storage system The law is provided.
[0018]
With this operation method, high-density ice storage is enabled by supplying sherbet-shaped ice into the heat storage tank during ice heat storage from the same heat storage tank supply member, and supplying hot water or the like during sensible heat storage. Good heat storage.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows the entire configuration of a dynamic ice heat storage system S using the heat storage tank supply member 1 according to the present embodiment, and a water intake unit 12 is provided at the bottom of the heat storage tank 11. ing. The outer shape of the water intake section 12 is surrounded by a pantang metal or a mesh, and an intake port (not shown) of an intake pipe 13 is opened therein.
[0020]
The water taken in by the pump 14 through the water intake pipe 13 is sent to a refrigerator, for example, a double-handle turbo refrigerator 15, and can be heated on the condensation side. The heated hot water can be supplied to the heat storage tank 11 through a supply pipe 16 that leads into the heat storage tank 11. In addition, a valve V1 is provided on the upstream side of the pump 14 of the water intake pipe 13, and a valve V2 is also provided in the middle of the supply pipe 16.
[0021]
One end of a branch intake pipe 21 is connected to the upstream side of the valve V1, and the other end is connected to a subcooler 22. The branch intake pipe 21 is provided with a valve V3 and a pump 23 downstream of the valve V3. The subcooler 22 has, for example, a shell-and-tube type, in which brine circulates with the brine refrigerator 24, and supercools water supplied from the branch intake pipe 21 to the subcooler 22 at 0 ° C. or lower. It is configured to discharge to the supercool release unit 25 after the state is changed. That is, a water intake pipe for taking water serving as a heat medium from the heat storage tank 11 is connected to a water heater (not shown) and a water cooler (not shown) so that the flow of water to both heat source devices can be switched. Has become. Further, the valves V1 and V2 are opened during the production of hot water and closed during the purification of ice / water slurry, and the valve V3 operates in the opposite direction to the two valves.
[0022]
The so-called sherbet-like ice of the ice / water slurry, which is generated when the supercooled state is released in the supercooled release unit 25, is transferred from the transfer pipe 26 connected to the lower part of the subcooled release unit 25 to the downstream side of the valve V2. And transferred to the supply pipe 16. The supply pipe 16 is branched from a main pipe 16a crossing the bottom of the tank in the heat storage tank 11, and a riser pipe 16b is vertically piped (two at intervals in the illustrated example). A heat storage tank supply member 1 according to the embodiment is attached.
Although not shown, the heat medium (hot water, ice, or water slurry) in the heat storage tank 11 is supplied by an air conditioner, an air conditioner load such as a heat exchanger that partitions the primary side and the secondary side, and other cooling / heating loads. After being subjected to temperature adjustment, it is returned. At this time, the heat medium intake port is provided at the bottom of the heat storage tank 11, for example.
[0023]
As shown in detail in FIGS. 3 and 4, the supply member 1 for a heat storage tank according to the present embodiment has a first opening 32 formed at the top of a cylindrical main body 31. A large number of small holes 33 serving as second openings are formed on the entire periphery of the side surface. If the region where the small holes 33 are formed in the main body 31 is formed by a perforated plate such as a punching metal, the manufacture is easy.
[0024]
The height h from the uppermost hole 33 in the heat storage tank supply member 1 to the first opening, the size and number of the holes 33, and the passage resistance when flowing out of the holes 33 are as follows. Each is set so as to be equal to or higher than the head pressure of the height h. That is, the water level difference (water head pressure) when flowing out of the small holes 33 is set to be equal to or higher than the water head pressure at the height h.
[0025]
An annular first disk 34 is concentrically attached to the lower outer periphery of the small hole 33 located at the lowermost stage in the main body 32, and is provided on the upper outer periphery of the small hole 33 located at the uppermost stage in the main body 32. Has an annular second disk 35 concentrically attached thereto. In the heat storage tank supply member 1 having such a configuration, as shown in FIG. 2, the first opening 32 protrudes from the water surface in the heat storage tank 11 and forms the second opening. In the hole 33, the small hole 33 located at the uppermost stage is attached to the tip of the supply pipe 16 and arranged so as to be located below the water surface.
[0026]
The ice heat storage system S has the above configuration. First, the operation at the time of ice heat storage using latent heat will be described. As shown in FIG. 2, the valves V1 and V2 are closed and the valve V3 is opened. Then, the supercooler 22 and the brine refrigerator 24 are operated. Then, the sherbet-like ice generated in the subcooling canceller 25 is ejected vertically from the first opening 32 of the heat storage tank supply member 1 through the supply pipe 16. At this time, the transport speed of the ice / water slurry flowing in the supply pipe 16 may be 1 m / s or more, as described above, and may be zero, as in a proposed example based on experiments by the inventors described later. The speed (superficial velocity, in other words, the flow velocity in the axial direction of the supply pipe 16) may be at least 0.8 m / s, that is, at least six times the transport speed of the hot water. Therefore, the installation height of the subcooling canceller 25, more specifically, the height of the water surface in the substantially cylindrical subcooling canceller 25 is somewhat higher than the first opening 32, for example, about 1000 mm higher. Set as follows. Of course, such a setting may be set, for example, in a range of 500 mm to 2000 mm.
[0027]
Here, since the pressure loss in the small hole 33 constituting the second opening is set to be larger than the head pressure at the height h, the sherbet-shaped ice is more first than the small hole 33. It squirts out of the opening 32 preferentially. Therefore, the sherbet-like ice is spouted vertically from the first opening 32, is uniformly discharged to the surroundings like a fountain, and accumulates on the water surface. By continuing such an ice storage operation thereafter, the ice in the heat storage tank 11 becomes highly compacted by its own weight of the accumulating ice and the pressure at the time of falling. . In addition, since the water is discharged to the surroundings in the atmosphere like a fountain, the first opening 32 is not closed.
[0028]
On the other hand, during sensible heat storage, for example, during hot water storage, operation is performed as follows. First, as shown in FIG. 5, the valve V3 of the branch intake pipe 21 is closed, and the valve V1 of the intake pipe 13 and the valve V3 of the supply pipe 16 are opened. Thereby, a circulation system is formed between the heat storage tank 11 and the double-handle turbo refrigerator 15. The water in the heat storage tank 11 from the water intake pipe 13 is heated by the operation of the double handle turbo refrigerator 15 to become hot water, and is supplied to the heat storage tank supply member 1 through the supply pipe 16. The flow rate of the hot water flowing through the supply pipe 16 at this time may be, for example, 0.1 m / s or less, or 0.15 m / s or less, that is, another example, as in a proposed example based on experiments performed by the inventors described later. As an index, a flow rate of 1/6 or less of the ice / water slurry may be used.
[0029]
The hot water supplied to the heat storage tank supply member 1 at such a flow rate is lower than the above-mentioned head pressure of the height h and does not reach the first opening at the top of the main body 31 but is located at a lower position. The liquid is discharged in the horizontal direction in the water from the small holes 33 constituting the second opening. At this time, since the first disk 34 is provided around the lower side of the lower hole 33 of the small hole 33, the hot water discharged from the small hole 33 flows along the first disk. Rectified and flows uniformly around the body at a slow speed. Therefore, the temperature stratification in the heat storage tank 11 is not disturbed. In particular, in the present embodiment, the second disk 35 is provided above the small hole 33 located at the uppermost stage among the small holes 33 forming the second opening. The rectification effect is further improved.
[0030]
When the heat storage tank supply member 1 shown in FIG. 3 is adopted, according to the experimental results of the inventors, considering the diameter and the pitch of the small holes 33, for example, the following settings are proposed for each part. be able to. Regarding the operating conditions per unit of the heat storage tank supply member 1, when the supply water amount for the ice / water slurry is 104 m ³ / h and the supply water amount for the hot water is 15.6 m ³ / h,
Diameter of first opening 32: 150 mm
Hole diameter of small hole 33: 3 mm
Pitch of small holes 33: 6 mm
Aperture ratio: 0.100835
Height h: 110mm
Distance between the first disk 34 and the second disk 35: 50 mm
Can be suggested.
In such a case, the flow rate of the ice / water slurry flowing through the main body 31 was 0.817803 m / s, while the flow rate of the hot water was 0.12267 m / s, thereby achieving the intended purpose.
[0031]
As described above, if the heat storage tank supply member 1 according to the present embodiment is used, in the dynamic type ice heat storage system S, the water storage tank 11 is used not only for ice heat storage using the latent heat of ice but also for water storage. It can be used as it is when storing hot water using sensible heat. In addition, it is possible to eject ice from the first opening 32 and deposit it on the water surface and store ice at a high density without artificial opening and closing operations of the valve. It is possible to discharge hot water in a horizontal direction from the large number of small holes 33 to realize good thermal storage of temperature stratification.
[0032]
In addition, since the sherbet-like ice is ejected like a fountain from the first opening 32 protruding above the water surface in the tank, there is no possibility that the opening is blocked by the ejected ice.
[0033]
In the heat storage tank supply member 1 used in the above-described embodiment, a large number of small holes 33 serving as second openings are formed on the entire periphery of the side surface of the main body 31. However, the small holes 33 are formed. A cylindrical member made of a punching metal or the like may be further arranged, for example, in a double or triple manner on the outer periphery of the side surface and between the first disk 34 and the second disk 35. . As a result, the rectification effect at the time of discharging hot water is further improved.
[0034]
Although the main body 31 of the heat storage tank supply member 1 used in the above-described embodiment has a cylindrical shape, the present invention is not limited to this. For example, the main body 31 may have a rectangular cylindrical shape like the main body 41 shown in FIG. May be. In this case, the rectifying plate 42 for uniformly diffusing the hot water discharged from the small holes 33 to the surroundings may also be a rectangular shape as shown in FIG.
[0035]
Further, the heat storage tank supply member 51 shown in FIG. 7 has a shape in which the main body 52 is divided into an upper part 52a and a lower part 52b, and covers the lower end of the upper part 52a and the upper end of the lower part 52b from the outer periphery. The large-diameter cylindrical member 53 is arranged between the lower end of the upper part 52a and the upper end of the lower part 52b. The gap 54 between the tubular member 53 and the main body 52 constitutes a second opening. The tubular member 53 is connected to the upper part 52a and the lower part 52b by a suitable support member 55. Even if the heat storage tank supply member 51 having such a configuration is used, sherbet-like ice is ejected from the first opening 32 formed at the top of the upper portion 52a without artificial valve switching operation. On the other hand, warm water can be discharged from the gap 54.
[0036]
Further, like the heat storage tank supply member 61 shown in FIG. 8, the main body 62 may have a double structure of a cylindrical outer main body 62a and an inner main body 62b, and an appropriate support member 63 may be passed between the two. Good. In such a case, the opening at the top of the outer body 62a forms the first opening 32, and the gap d between the outer body 62a and the inner body 62b forms the second opening on the side surface of the body 62. I do.
In addition, for example, the above-mentioned main body 52 is divided into an upper part 52a and a lower part 52b, and a space is provided between the two parts, and a connection and connection are made between the lower end of the upper part 52a and the upper end of the lower part 52b. It is also possible to adopt a configuration in which appropriate column members serving also as resistors are arranged, for example, in an annular shape at appropriate intervals. In this case, the gap between the column members constitutes the second opening.
[0037]
【The invention's effect】
According to the present invention, it is possible to supply sherbet-shaped ice into the heat storage tank during ice storage and supply sensible heat water when the heat storage tank is used as a sensible heat storage tank through the same pipe. The released ice does not block the discharge port, and ice storage with high pressure density becomes possible in the heat storage tank during ice storage. In addition, no artificial valve operation is required.
[Brief description of the drawings]
FIG. 1 is a chart showing a comparison of a water amount ratio and the like between a dynamic ice heat storage system and a temperature stratified type hot water heat storage.
FIG. 2 is a schematic diagram illustrating the configuration of an ice heat storage system using a heat storage tank supply member according to the present embodiment, and is an explanatory diagram during ice storage.
FIG. 3 is a perspective view of a heat storage tank supply member according to the present embodiment.
FIG. 4 is a side sectional view of the heat storage tank supply member of FIG. 3;
FIG. 5 is an explanatory diagram at the time of storing hot water in the ice heat storage system of FIG. 2;
FIG. 6 is a perspective view of a heat storage tank supply member according to another embodiment having a cylindrical main body.
FIG. 7 is a perspective view of a heat storage tank supply member according to another embodiment having a divided main body.
FIG. 8 is a perspective view of a heat storage tank supply member according to another embodiment having a double cylindrical main body.
[Explanation of symbols]
S Ice heat storage system 1 Heat storage tank supply member 11 Heat storage tank 16 Supply pipe 31 Main body 32 First opening 33 Small hole 34 First disk 35 Second disk

Claims (5)

A supply member for supplying sherbet-like ice into the heat storage tank,
A tubular main body attached to a pipe for supplying the sherbet-like ice into the heat storage tank and arranged vertically,
A first opening formed on the top of the main body, and a second opening formed on a side surface of the main body;
The supply member for a heat storage tank, wherein a passage resistance of the second opening is equal to or higher than a water head pressure from the second opening to the first opening. A supply member for supplying sherbet-like ice into the heat storage tank,
A tubular main body attached to a pipe for supplying the sherbet-like ice into the heat storage tank and arranged vertically,
A first opening formed on the top of the main body, and a second opening formed on a side surface of the main body;
The supply member for a heat storage tank, wherein the second opening comprises a plurality of slits or small-diameter holes. The supply member for a heat storage tank according to claim 1 or 2, wherein a horizontal plate is provided around a lower side of the second opening in the main body. 4. The heat storage tank supply member according to claim 3, wherein a horizontal plate is provided around an upper side of the second opening in the main body. In an ice heat storage system configured to take water in a heat storage tank to generate sherbet-like ice and supply the sherbet-like ice to the heat storage tank through a pipe,
The supply member for a heat storage tank according to any one of claims 1 to 4 is attached to the pipe, a first opening of the supply member for the heat storage tank projects from a liquid level in the tank, and a second opening is provided. Positioning the heat storage tank supply member such that the opening is located below the liquid level in the tank;
When supplying the sherbet-like ice, the sherbet-like ice is discharged from the first opening of the heat storage tank supply member,
In the case where the heat storage tank is used as a sensible heat storage tank, sensible heat water is supplied into the tank from the second opening of the heat storage tank supply member through the pipe. how to drive.

Images