JP3505733B2 - Ice storage method and ice storage pipe system in ice thermal storage system - 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 storage method and an ice storage pipeline system in an ice heat storage system.

[0002]

2. Description of the Related Art When cooling and heating water by circulating cold / hot water stored in a heat storage tank through a water side heat exchanger of a fan coil unit or a water heat source heat pump unit installed in a building, the cold heat during cooling is stored. An ice heat storage system that stores ice in the form of ice in a tank has attracted particular attention in recent years because a large amount of cold heat can be stored even in a small-scale device. By the way, the ice stored in the heat storage tank in such an ice heat storage system is classified into an ice block type and a sherbet type depending on the type of ice to be produced and used. P.
F. (Ice filling rate) can be increased, and heat storage efficiency can be improved.

In producing such sherbet-like ice, for example, JP-A-63-217171, JP-A-63-231157 and JP-A-1-11468 are used.
In the technology disclosed in Japanese Patent Publication No. 2 etc., a method, an apparatus, etc. for continuously producing from supercooled water have already been proposed. According to these known techniques, the supercooled water is continuously discharged from the discharge port of the heat transfer tube of the supercooler into the air, and the discharge flow is collided with the supercooling releasing means such as a collision plate to give an impact. This makes it possible to continuously and efficiently generate sherbet-like ice in a slurry state with water (ice / water slurry).

On the other hand, recently, efforts are being made for large-scale heat storage equipment as demand increases, but when there is no room to install a large-capacity single heat storage tank, a so-called underground slab is used. A multi-tank type heat storage tank has been proposed. This is, for example, as shown in FIG.
54 is connected by the communication pipes 55, 56, 57 to constitute one heat storage tank as a whole. In order to store the sherbet-shaped ice in the communication type multi-tank type heat storage tank, the following method has been conventionally used.

First, the pump 58 is moved from the tank 54 on the most downstream side.
The water taken in by the supercooler 59 is turned into supercooled water by the supercooler 59 and discharged into the air.
Converted to water slurry. Thereafter, the ice / water slurry is transferred to the transfer pipe 61 and a branch pipe 6 branched from the transfer pipe 61.
2, 63, 64, 65, from which each tank 5
1, 52, 53, 54, each of the branch pipes 62, 63, 64, 65 is provided with a switching valve 62a, 63a, 64a, 65a, respectively.
By appropriately operating these switching valves 62a, 63a, 64a, 65a, first, the supply of ice / water slurry and the storage of ice are started only for the small tank 51 on the most upstream side, and then the ice volume of the ice water phase is increased. As shown in FIG. 3, the changeover valves 62a, 63a, 64a, 65a are appropriately changed over so that the ice storage is sequentially transferred to the small tanks 52, 53, 54. By storing ice in this way, a state in which the ice volume of the ice-water phase is large in this order is created in each of the small tanks 51, 52, 53, 54, as shown in FIG. As a result, ice heat storage was being achieved under a very large ice volume.

[0006]

However, the so-called serial sequential ice storage method as described above has the following problems. That is, when sherbet-shaped ice is stored in the tank, the passage pressure loss of water due to the ice layer in the tank increases as the ice storage progresses, and the tank internal pressure rises. In the method, the water level in the upstream side tank connected by the communication pipe rises due to the increase in tank pressure due to the increase in the amount of ice storage. However, since the water for the rising water level is supplied from the downstream side tank of the ice storage tank, the downstream side tank, especially the most downstream side tank 54
Then, a large drop in water level will occur.

When the inventors of the present invention actually conducted an experiment in the communication type multi-tank type heat storage tank shown in FIG. 2, the results shown in the graph of FIG. 3 were obtained. According to this, it is understood that the water level in the most downstream side tank 54 is remarkably lowered.
With this, in a place where only a shallow water tank can be installed, there is a problem that the number of small tanks connected in communication is limited, and the capacity of the entire heat storage tank cannot be increased.

Further, in order to carry out the above-mentioned serial sequential ice storage method, the switching valves 62a, 63a, 64a, 65 are used.
Although a is required, the upper part of the underground slab sewage tank that is generally used as a heat storage tank is provided in the machine room,
Therefore, these switching valves have to be installed in the tank,
Moreover, its specifications need to be waterproof. Therefore, it is not preferable in terms of construction and cost.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and in place of the above-described serial sequential ice storage method, so-called parallel simultaneous ice storage method, and The above problem is solved by providing an ice storage pipeline system suitable for carrying out the method.

Therefore, in claim 1, supercooled water is generated by a supercooler installed outside the heat storage tank for storing the heat source water for air conditioning, and ice converted from the supercooled water by the supercooling release means. In an ice heat storage system that stores ice in water slurry in the heat storage tank, the heat storage tank is a multi-tank heat storage tank consisting of multiple independent small tanks, and the ice / water slurry is supplied to the heat storage tank to store the ice. An ice storage method for an ice heat storage system is provided, in which ice / water slurry is simultaneously supplied to water in each of the small tanks to store ice.

Further, in claim 2, supercooled water is provided by a subcooler installed outside a pipe system suitable for carrying out the invention of claim 1, that is, a heat storage tank for storing heat source water for air conditioning. generates, ice converted ice-water slurry from the supercooled water by supercooling release means, a conduit system in the ice thermal storage system for storing the heat storage tank, the storage tank includes a plurality of independent a and multi-chamber heat storage tank comprising a small tank was, the intake pipe for intake of water of the small tank is connected in parallel with the first transfer pipe connected to the subcooler, and further wherein each of One end of each distribution pipe that supplies ice and water slurry into the small tank,
With respect to the transport pipe 1 connected to the supercooling releasing means, the
Each tank is connected along the transfer pipe, and
An ice storage pipeline system in an ice heat storage system is provided, wherein the other end is opened into water in the small tank .

[0012]

According to the first aspect of the present invention, ice
Since a method is adopted in which the water slurry is simultaneously supplied in parallel to the water in the small tanks to store ice, during the ice storage process in the middle, there is a difference in the line resistance of the supply pipes connected to each small tank. There is a difference in the amount of ice storage between the small tanks. However, in a small tank with a large amount of ice storage, the pressure loss increases due to an increase in the ice phase, so that in the subsequent supply, a large amount of ice storage will gradually flow into the small tank side with low resistance. That is, ice is always supplied to a small tank with a small amount of ice storage. Therefore, in the end, ice will be stored almost uniformly in each tank.

In addition, since the ice is naturally supplied to the small tanks having a small amount of ice storage by supplying them in parallel at the same time, the ice / water slurry is distributed and supplied to the respective small tanks. It is not necessary to provide a switching valve for the distribution pipe.

According to the second aspect, the water intake pipeline for supplying water to the subcooler and the supply pipeline for supplying the produced ice / water slurry to the respective small tanks are arranged in parallel. Therefore, the water intake system can be uniformly taken from each small tank, and the ice / water slurry supply system can also be simultaneously supplied to the water in each small tank. Therefore, the method of claim 1 can be carried out as it is without affecting the circulating water system.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of main constituent elements of an ice storage facility for implementing the present embodiment. 1
As is clear from the figure, is an independent multi-tank type heat storage tank consisting of three independent small tanks 2, 3 and 4.

Independent water intake pipes 5, 6, and 7 are connected to the bottoms of the small tanks 2, 3, and 4, respectively, from which water is taken in via an ice nucleus separator (not shown) such as an ice filter. The water in each of the small tanks 2, 3 and 4 thus collected is collected in one carrier pipe 8 and is supercooled by the pump 9 outside the heat storage tank 1.
Is continuously supplied to. The subcooler 10 does not transfer the transported water.
The supercooled water having a temperature of ° C or less is discharged into the atmosphere, and the discharged stream of the supercooled water drops into the vertical pipe 11.

The vertical pipe 11 is a vertical pipe having an inner diameter sufficient to receive the discharge flow of the supercooled water, and the upper end of the vertical pipe 11 is formed with a divergent receiving portion 12 formed therein to open.
The lower end communicates with the carrier pipe 13. Then, the impact of the supercooled water falling into the vertical pipe 11 produces an ice-water slurry formed of fluid fine ice and water.

The carrier pipe 13 is an in-tank pipe that penetrates each side wall of each of the small tanks 2, 3, and 4.
The distribution pipes 14, 15 and 16 are connected to the respective distribution pipes 14, 15 and 16, and the ice,
The water slurry is supplied to store ice in the small tanks 2, 3, and 4. The ice storage equipment according to the present embodiment has the above-described configuration. During the ice making / ice storage operation that is usually performed at night, the pump 9 operates to take water from each of the small tanks 2, 3 and 4. Water is uniformly taken by 5, 6, and 7, and the subcooler 1
The water of the heat storage tank 1 is supplied to 0.

The ice / water slurry produced in the vertical pipe 11 by the supercooled water discharged from the subcooler 10 is passed through the carrier pipe 13 and the respective distribution pipes 14, 15, 16 to the small tanks 2, 3 ,. It is supplied in 4 and ice is stored. In this case, in the course of storing ice in the middle, a difference in ice storage amount occurs between the small tanks 2, 3, and 4 due to the difference in pipe resistance. Due to the increase, in such a case, the ice storage amount is still small, and the ice flows into the small tank having a small conduit resistance. That is, since the ice is always supplied to the small tank with a small amount of ice storage, even if there is a slight difference in the amount of ice storage between the small tanks 2, 3, and 4 during the ice storage, the final In each of the small tanks 2, 3, 4, the ice is almost evenly stored.

Further, each of the small tanks 2, 6 is connected by the water intake pipes 5, 6, 7.
Since water is taken every 3 and 4, the water level change in each of the tanks 2, 3 and 4 is not large, and therefore there is no limit to the number of tanks to be installed. Therefore, the heat storage tank 1 as a whole can have a very large capacity. Furthermore, as described above, ice is uniformly stored in each of the small tanks 2, 3 and 4, so that it is not necessary to provide a switching valve, which was necessary for distributing ice / water slurry, unlike the above-described conventional technique. It also has great advantages in terms of construction and cost.

Furthermore, since each of the tanks 2, 3 and 4 is not connected to each other as in the conventional case but is installed independently, the degree of freedom of the installation location of each tank is increased and the inside of the building is increased. The space of can be used effectively. Moreover, since the piping work for connecting the small tanks to each other is not necessary, the amount of construction as a whole can be reduced.

Although not shown, when the cold / hot water thus stored in the heat storage tank 1 is used as the heat source water of the load side heat exchanger, the cold / hot water is taken in and circulated in each small tank 2 ,
Water may be taken every 3 and 4 and may be collected in one pipe line and supplied to the load side heat exchanger, and the return water whose temperature is raised there is also the above-mentioned carrier pipe 13 and the distribution pipe 14 for this. 1
It may be returned to each of the small tanks 2, 3, and 4 by a circulation conduit system having a configuration similar to the relationship of 5 and 16.

Further, in the above embodiment, the carrier pipe 13 is constituted by the in-tank piping which penetrates each of the small tanks 2, 3 and 4 in the horizontal direction, but the water in the tank is supplied to the subcooler 10. Similarly, the carrier pipe 8 may be an in-tank pipe, in which case the space in the building can be effectively used. On the other hand, if there is a space in the space, it is of course possible to adopt a configuration in which these transfer pipes 13 are used as outside pipes and the distribution pipes are connected to the small tanks 2, 3, 4 from outside the tank.

[0024]

According to the first aspect of the present invention, in an ice heat storage system which employs a multi-tank type heat storage tank composed of a plurality of small tanks, the water level in each small tank is not increased to be uniform in each of these small tanks. Since it can store ice, there is no limit to the number of tanks that can be installed. Therefore, it is easy to build a large capacity ice heat storage system. Further, since each of the small tanks has an independent tank structure, the degree of freedom of the installation location of the small tanks is increased, and the space in the building can be effectively used. Further, since a switching valve for distributing the ice / water slurry to each of the small tanks is not necessary and a pipe for connecting the small tanks to each other is also unnecessary, the amount of construction and the number of members can be reduced.

According to the second aspect, the method of the first aspect can be carried out as it is without affecting the system of circulating water, and the operational effect obtained in the first aspect can be provided as it is. Further, in that case, since the water intake pipe and the distribution pipe are connected in parallel to the main carrier pipe, the pipe line can be efficiently arranged in carrying out the invention of claim 1.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a main configuration according to an embodiment.

FIG. 2 is a schematic diagram of a main configuration in the related art.

FIG. 3 is a graph showing changes in water level in each small tank during ice storage in the conventional technique.

[Explanation of symbols]

1 heat storage tank 2, 3, 4 small tank 5, 6, 7 intake pipe 8 carrier tubes 9 pumps 10 Supercooler 11 vertical pipes 13 Conveyor tube 14, 15 and 16 minute piping

Front page continuation (72) Inventor Ei Kikuchi 1-3-17 Shimotsuko Hisatsu, Atsugi City, Kanagawa Prefecture (72) Inventor Masayuki Yano 2-8-21-101 Kyowa, Sagamihara City, Kanagawa Prefecture (72) Mitsuru Moriya, Zama, Kanagawa Prefecture City Sagamigaoka 3-7-25 Sunlight Hills 203 (72) Inventor Shinbu Iribe 3-20-9 Nishiokuta, Tama-ku, Kawasaki-shi, Kanagawa (72) Inventor Kazunori Eto 4-15 Morino, Machida-shi, Tokyo 12 Terada Building Morino B-311 (72) Inventor Tadashi Matsumoto 3-14-50 Atsugi Kita, Atsugi City, Kanagawa A-103 Corp Honatsugi A-103 (56) Reference JP 54-146445 (JP, A) JP HEI 5-1834 (JP, A) Actual Kaihei 6-28525 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 5/00 102 F28D 20/00

Claims (2)

(57) [Claims] 1. A subcooler installed outside a heat storage tank for storing heat source water for air conditioning generates supercooled water, and the supercooling release means converts the supercooled water into the ice / water slurry. In the ice heat storage system for storing ice in the heat storage tank, the heat storage tank is a multi-tank type heat storage tank composed of a plurality of independent small tanks, and the ice / water slurry is supplied to the heat storage tank to store ice. An ice storage method in an ice heat storage system, wherein ice and water slurry are simultaneously supplied to the water in each of the small tanks to store the ice. 2. A subcooler installed outside a heat storage tank for storing heat source water for air conditioning generates supercooled water, and the supercooling release means converts the supercooled water into the ice / water slurry. A pipe system in an ice heat storage system for storing ice in the heat storage tank, wherein the heat storage tank is a multi-tank heat storage tank composed of a plurality of independent small tanks.
, And the respective intake pipe for intake of water of the small tank is connected in parallel to the conveying pipe 1 connected to the subcooler, and further supplied to the ice-water slurry to said each of the small tank one each distribution pipe for
The end portion is connected to one transport pipe connected to the subcooling releasing means along each transport pipe for each small tank , and each
An ice storage pipeline system in an ice heat storage system, wherein the other end of the distribution pipe is opened to the water in the small tank .