JP3126521B2 - Supply method of ice / water slurry in ice thermal storage method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for supplying a water slurry.

[0002]

2. Description of the Related Art When cooling and heating by circulating cold and hot water stored in a heat storage tank to a water-side heat exchanger of a fan coil unit and a water heat source heat pump unit disposed in a building, the cooling heat during cooling is stored. In recent years, a so-called ice heat storage system for storing ice in a tank has attracted particular attention because a small-scale device can store a large amount of cold heat. 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 generated and used.
P. F. (The filling rate of ice) can be increased, and the heat storage efficiency can be improved.

[0003] In producing such sherbet-like ice, for example, JP-A-63-217171, JP-A-63-231157, and JP-A-1-1468.
In the technology disclosed in Japanese Patent Laid-Open Publication No. 2 (1993) -210, a method and an apparatus for continuously generating supercooled water have already been proposed. According to these known techniques, the supercooled water is continuously discharged into the air from the discharge port of the heat transfer tube of the supercooler, and the discharged flow collides with a supercooling release unit such as a collision plate to apply an impact. Thereby, sherbet-like ice can be continuously and efficiently generated in a slurry state with water (ice / water slurry). The ice heat storage method of generating the above-mentioned ice / water slurry with the water taken from the heat storage tank and supplying the ice / water slurry to the heat storage tank so that the ice / water coexists in the heat storage tank is extremely efficient. It is being widely used for air conditioning.

[0004] As a method for supplying the ice / water slurry thus produced to a heat storage tank, there has been the following method. For example, Japanese Unexamined Utility Model Publication No. 4-8025 discloses a method of dropping on a flat plate as a supercooling canceling means provided on the upper part of the tank and supplying the same directly to the heat storage tank. This will be described with reference to FIG.
01, water supplied by a pump 102 is supplied to a subcooler 103 provided above the heat storage tank 101, and supercooled water discharged from the subcooler 103 is supplied to the heat storage tank 1
The supercooled state is released by colliding with a flat plate 104 provided on the upper portion of the storage tank 01, and the resulting ice / water slurry is dropped directly into the heat storage tank 101 and supplied to the heat storage tank 101.

Further, according to another prior art, means for transferring ice / water slurry through a pipe by a head difference on the water surface has been proposed. This is, as shown in FIG. 7, water taken from the lower part of the heat storage tank 111 by the pump 112,
Also supplied to a supercooler 113 provided above the heat storage tank 111, the supercooled water discharged from the supercooler 113 is
The ice / water slurry generated at that time is dropped into a vertical pipe 114 serving as a subcooling canceling means provided above the heat tank 111 and below the subcooler 113, It is supplied from above the heat storage tank 111 by a branch pipe 115 connected to the side and disposed above the heat storage tank 111.

[0006] Also, there has been proposed the one shown in Fig. 8 which employs a supply method basically similar to the above-mentioned prior art.
This is because water taken by a pump 122 from the lower part of the heat storage tank 121 is supplied to a supercooler 123 provided above the side part of the heat storage tank 121, and the supercooled water discharged from the supercooler 123 is stored in a heat storage tank. The ice / water slurry generated at that time is dropped into a vertical pipe 124 provided above the side of the tank 121 and below the subcooler 123, and the ice / water slurry generated at that time is placed on the water surface (ice / water) in the vertical pipe 124. Utilizing the pressure difference due to the height difference between the water phase surface in the slurry) and the water surface in the heat storage tank 121,
The heat is supplied into the heat storage tank 121 from a lower part of the vertical pipe 124 through a branch pipe 125 that is piped into the heat storage tank 121.

[0007]

However, the above-mentioned prior art has the following problems.

That is, first, the heat storage tank 10 as shown in FIG.
In a method in which a plate-shaped supercooling release means is provided above 1 and the ice / water slurry is supplied directly to the heat storage tank by dropping, a supercooler and a plate-shaped supercooling release means are provided above the heat storage tank. Space is needed. Therefore, when there is no such space above the heat storage tank, there is a possibility that an ice heat storage system cannot be configured, or the capacity of the heat storage tank may be limited.

Further, as shown in FIG. 7, when the vertical pipe 114 is provided at the upper part of the tank as the supercooling canceling means, the heat storage tank is more space and applicable than the plate-like supercooling canceling means. Although the degree of freedom increases, the restriction that these two main devices must still be installed at the top of the tank is inevitable.

Further, in the apparatus shown in FIG. 8, a supercooler and a subcooling canceling means can be provided even if the supercooler and the supercool release means are not provided directly above the tank. , Water surface in vertical pipe 124 and heat storage tank 12
1, it is necessary to secure a height difference from the water surface in the heat storage tank 1. Therefore, the system must be installed in a place where at least the water surface in the vertical pipe 124 is higher than the water surface in the heat storage tank 121. Is still subject to significant restrictions. In particular, in recent years, in view of the increase in demand, there has been an increasing interest in large-scale ice thermal storage systems that use flat multi-tank thermal storage tanks that use underground slabs. Obviously, installing a cooler and vertical pipes is a major design constraint.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the installation location of a subcooler and a corresponding supercooling release pipe can be set at a position below the water surface of a heat storage tank. An object of the present invention is to provide a method for supplying an ice / water slurry to solve the above problem.

Therefore, first, in the first aspect, the water taken from the heat storage tank for storing the heat source water for air conditioning is supplied to a supercooler installed outside the heat storage tank, and the supercooled water discharged from the supercooler is discharged. In the ice heat storage method in which water is dropped into a supercooling release pipe and the resulting ice / water slurry is supplied into the heat storage tank, and ice / water coexists in the heat storage tank, An ice / water slurry in the ice heat storage method, wherein a pump is installed on the downstream side, and an ice / water slurry is supplied to the heat storage tank by pumping while maintaining a constant water level in the supercooling release pipe. Supply method.

In this case, in order to keep the water level in the subcooling release pipe constant, a pump bypass pipe is provided downstream of the supercooling release pipe, and the pump bypass pipe is provided in the pump bypass pipe. This can be done by operating a valve. Further, the control of the operation of the valve may be performed based on a signal from a liquid level measuring device for detecting a water level in the subcooling release pipe, as described in claim 3.

In order to keep the water level in the subcooling release pipe constant, the flow rate of the ice / water slurry to be pumped is controlled by controlling the pump (for example, inverter control). You may. Even in the case where control is performed on the pump side as described above, control can be performed based on a signal from a liquid level measuring device that detects a water level in the subcooling release pipe, as described in claim 5.

In each of the above methods, as described in claim 6, a configuration may be adopted in which water is taken from the heat storage tank by maintaining the subcooler below the water surface in the heat storage tank.

[0016]

According to the first aspect, since the ice / water slurry is supplied to the heat storage tank by pumping by a pump, it is necessary to set the position of the water surface in the supercool release pipe to a position higher than the water surface of the heat storage tank. Absent. In this case, since the water is pressure-fed while keeping the water level in the supercooling release pipe constant, the same amount of ice / water slurry as the supercooled water is supplied to the heat storage tank.

According to the second aspect of the present invention, a pump bypass pipe is provided downstream of the supercool release pipe, and the water level in the supercool release pipe is kept constant by operating a valve provided in the pump bypass pipe. There is no problem such as blockage due to ice at the sea. In addition, it is possible to increase the flow velocity in a portion where the possibility of blockage in the pipe is large, such as a reduced portion of the supercooling release pipe, whereby the supercooling is released and the ice / water slurry is transported more smoothly.

According to the third aspect, the operation of the second aspect can be automatically performed.

According to the fourth aspect, the water level in the subcooling release pipe can be kept constant without providing the bypass pipe as in the second aspect.

According to the fifth aspect, the operation of the fourth aspect can be automatically performed.

According to the sixth aspect of the invention, water can be taken by a pressure caused by a height difference between the water surface in the heat storage tank and the water surface in the subcooling release pipe.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of main components necessary for carrying out the first embodiment. This is a heat storage tank using an underground slab.
Is adjacent to A subcooler 3 and a vertical pipe 4 serving as a subcooling canceling means for converting supercooled water discharged from the subcooler 3 into ice / water slurry are installed in the machine room 2.

An ice filter 5 for separating ice nuclei is provided below the heat storage tank 1.
The water in the heat storage tank 1, which is taken in from a water intake pipe 6 arranged below, is supplied to the supercooler 3 by a pump 7. The supercooled water generated by the subcooler 3 is
It is discharged and falls into the vertical pipe 4, and the impact at that time releases the supercooled state and ice / water slurry is generated.

FIG. 2 shows the surroundings of the pipe on the downstream side of the vertical pipe 4.
The pump 8 for pumping the ice / water slurry into the heat storage tank 1 is provided in a main transfer pipe 9 connected to the bottom of the vertical pipe 4. A passing pump bypass pipe 10 is connected in parallel to the main transport pipe 9.

The pump bypass pipe 10 is provided with a motor-operated valve 11 for controlling the opening and closing of the motor-operated valve 11 by detecting a water level in the vertical pipe 4 and outputting a control signal based thereon. This is performed by the vessel 12. That is, the liquid level gauge controller 12 always monitors the water level in the vertical pipe 4,
A control signal is output to the motor-operated valve 11 so as to maintain a predetermined water level, and the motor-operated valve 11 is opened and closed by the control signal. The ice / water slurry whose flow rate has been controlled in this manner is configured to be supplied into the heat storage tank 1 from the branch discharge pipe 13 provided in the heat storage tank 1 through the main transport pipe 9.

The main equipment for carrying out the first embodiment is arranged and configured as described above. In the ice making / ice storage operation usually performed at night, heat is stored by operating the pump 7. The water taken from the tank 1 is supplied to the subcooler 3,
The supercooled water discharged therefrom falls into the vertical pipe 4 to generate ice / water slurry.

Then, the ice / water slurry is pumped through the main transfer pipe 9 by the pump 8 and supplied into the heat storage tank 1 from the branch discharge pipe 13. As described above, since the ice / water slurry is supplied into the heat storage tank by the pumping by the pump 8, the installation height of the supercooler 3 and the vertical pipe 4 can be set regardless of the height of the water surface in the heat storage tank 1. . Therefore, as shown in FIG. 1, it is possible to install the supercooler 3 and the vertical pipe 4 in the machine room 2 adjacent to the heat storage tank 1. Therefore, when a heat storage tank is configured using an underground slab, the system can be easily constructed, and the underground slab can be used most effectively.

Further, in pumping the ice / water slurry in the vertical pipe 4 by the pump 8 as described above,
Level gauge controller 12 and motor-operated valve 1 controlled thereby
1, the water level in the vertical pipe 4 is kept constant, so that the same amount of ice / water slurry as the supercooled water to be generated is supplied to the heat storage tank 1. Absent.

In this embodiment, since the pump bypass pipe 10 is provided and the flow rate is adjusted by the electric valve 11 provided in the pump bypass pipe 10, the main transfer pipe 9 is provided.
There is no risk of clogging due to ice inside, and the flow velocity increases in a portion where there is a high possibility of clogging in the pipe, such as a reduced portion of the vertical pipe 4, so that supercooling is released and the ice / water slurry is pumped more smoothly. . The ice that has not been sufficiently released from the supercooling is likely to adhere, but a reflux pipe 10 ′ for returning a part of the ice / water slurry from the pump 8 to the inside of the vertical pipe 4 as shown by a broken line in FIG. Is provided, the supercooling is more reliably released, and as a result, the adhesion of ice inside the main transport pipe 9 is more reliably prevented.

Incidentally, when the pump bypass pipe 10 is provided as in the first embodiment, the flow rate in each pipe is
It is as follows. That is, the amount of water supplied to the subcooler 3 is U ₁ , the amount of water flowing through the main transport pipe 9 between the vertical pipe 4 and the connection part of the pump bypass pipe 10 is U ₂ , Assuming that the amount to be supplied is U ₃ and the amount finally supplied to the heat storage tank 1 through the main transfer pipe 9 is U ₄ , U ₂ = U ₁ + U ₃ > U _{1. 1} = it is a U _4.

Next, a second embodiment will be described with reference to FIG. 3. This embodiment is a case where the present invention is applied to a so-called multiple water tank parallel ice storage type heat storage tank, and is shown in FIG. As described above, the heat storage tank 21 in the present embodiment includes the small tanks 21a and 21a.
b, 21c. Other configurations such as the supercooler 3 and the vertical pipe 4 are the same as those in the first embodiment, and the same reference numerals as those in FIG. The illustrated components have the same configuration as that of the first embodiment.
Although not shown, a pump bypass pipe, an electric valve, and a level gauge controller similar to those of the first embodiment are provided downstream of the vertical pipe 4.

As described above, the present invention can be applied to a heat storage tank of a plurality of water tank parallel ice storage type. In this case, too, the positions of the supercooler 3 and the vertical pipe 4 are lower than the water surface in the heat storage tank 21. The same operation and effect as in the first embodiment can be obtained, such as setting. In addition, since the pressure is fed by the pump 8, even if the conveyance distance of the ice / water slurry is increased as shown in FIG. 3, the slurry can be supplied to the small tanks 21a, 21b, 21c of the heat storage tank 21 without any trouble.

In the present invention, since the pressure is fed by the pump, for example, as in the third embodiment shown in FIG. 4, a position higher than the positions of the subcooler 3 and the vertical pipe 4, that is, the heat storage tank 31 is provided.
Even if a branch discharge pipe 32 connected to the main transfer pipe 9 is arranged in the upper part of the inside, it is possible to supply the ice / water slurry into the heat storage tank 31.

Further, as shown in the fourth embodiment shown in FIG. 5, when the supercooler 3 is set at a position lower than the water surface of the heat storage tank 41, the intake pipe is utilized by utilizing the head pressure of the water tank. 6
From the heat storage tank 41 and supply it to the subcooler 3, so that the pump 7 required for water intake in each of the above embodiments can be eliminated. Also in this case, since the ice / water slurry is pumped by the pump 8 and supplied to the heat storage tank 41, even if the supercooler 3 is installed at a position lower than the water surface position in the heat storage tank 41, There is no problem with the supply of the water slurry.

As can be seen from each of the above embodiments, according to the present invention, the installation location and height of the supercooler and the vertical pipe for the heat storage tank can be freely set. The restriction on the positional relationship of these equipments, which has been a great restriction, can be greatly eased.

[0036]

According to the first aspect, since the ice / water slurry is supplied to the heat storage tank by pumping by a pump, the position of the water surface in the supercooling release pipe is set to a position higher than the water surface of the heat storage tank. There is no necessity, so restrictions on the positional relationship of equipment when building an ice thermal storage system can be greatly relaxed. For example, when building a system in an existing building, etc., make the best use of the limited space as much as possible. Can be. In addition, since the same amount of ice / water slurry as the supercooled water is supplied to the heat storage tank, there is no problem by pumping.

According to the second aspect, since the water level in the supercooling release pipe is kept constant by operating the valve provided in the pump bypass pipe, problems such as clogging by ice inside the pipe do not occur, and furthermore, the supercooling is performed. Since the flow velocity is increased in a portion where the possibility of blockage in the pipe is large, such as a reduced portion in the release pipe, the supercooling is released and the ice / water slurry is transported more smoothly.

According to the third aspect, the invention described in the second aspect can be implemented in an automated manner.

According to the fourth aspect, the water level in the subcooling release pipe can be kept constant without providing the bypass pipe as in the second aspect, so that the amount of piping work is not increased. 1 is obtained. Further, the degree of freedom of the installation location of the equipment is greater than that of the second aspect.

According to the fifth aspect, the invention described in the fourth aspect can be implemented in an automated manner.

According to the sixth aspect, the functions and effects of the first to fifth aspects can be obtained without providing a pump for taking water. Therefore, the equipment required for the intake system can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of main components in a first embodiment.

FIG. 2 is an explanatory view showing the periphery of a pipe on the downstream side of a vertical pipe in the first embodiment.

FIG. 3 is a schematic diagram of main components in a second embodiment.

FIG. 4 is a schematic diagram of main components in a third embodiment.

FIG. 5 is a schematic diagram of main components in a fourth embodiment.

FIG. 6 is an explanatory diagram of a conventional technique using a flat plate as supercooling release means.

FIG. 7 is an explanatory diagram of a conventional technique using a vertical pipe as supercooling release means.

FIG. 8 is an explanatory view of a prior art in which a vertical pipe is used as a supercooling canceling means and a supply port for ice / water slurry is provided at a lower portion in the heat storage tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal storage tank 3 Subcooler 4 Vertical pipe 6 Intake pipe 7 Pump 8 Pump 9 Main conveyance pipe 10 Pump bypass pipe 11 Electric valve 12 Liquid level gauge controller 13 Branch discharge pipe

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Tanino 2-8-21-101 Kyowa, Sagamihara City, Kanagawa Prefecture (72) Inventor Kazunori Eto 4-15-12 Morino, Machida, Tokyo Terada Building Morino B-311 (72) Inventor Tadashi Matsumoto 3-14-50 Tsumadakita, Atsugi-shi, Kanagawa A-103 Corp Honatsutsugi A-103 (72) Inventor Mitsuru Moriya 3-7-25, Sagamigaoka, Zama-shi, Kanagawa Sunlight Hills 203 (72) Inventor Sakae Kikuchi 1-3-17 Kokyu Shimotsu, Atsugi City, Kanagawa Prefecture (72) Inventor Matake Iribe 3-20-9, Nishiikuta, Tama-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-6-123455 (JP, A) JP-A-6-123456 (JP, A) JP-A-6-94268 (JP, A) JP-A-5-1834 (JP, A) JP-A-1-114682 (JP, A) JP-A-63-217171 (JP, A) JP-A-63-231157 (JP, A) A) Japanese Utility Model Application Hei 6-32935 (JP, U) Japanese Utility Model Application Hei 4-8025 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 F28D 20/00

Claims (6)

(57) [Claims] 1. A system according to claim 1, wherein water taken from a heat storage tank for storing heat source water for air conditioning is supplied to a supercooler installed outside the heat storage tank, and supercooled water discharged from the supercooler is released from subcooling. In the ice heat storage method in which the slurry is dropped into a pipe and the resulting ice / water slurry is supplied into the heat storage tank, and ice / water coexists in the heat storage tank, a pump is provided downstream of the supercooling release pipe. A method for supplying ice / water slurry in an ice heat storage method, wherein the ice / water slurry is supplied to the heat storage tank by pumping while maintaining the water level in the supercooling release pipe at a constant level. 2. A pump bypass pipe is provided downstream of the subcooling release pipe, and a water level in the supercooling release pipe is kept constant by operating a valve provided in the pump bypass pipe. 3. The method for supplying an ice / water slurry in the ice heat storage method according to item 1. 3. The ice storage method according to claim 2, wherein the operation of the valve is controlled based on a signal from a liquid level measuring device for detecting a water level in the supercooling release pipe. How to supply water slurry. 4. The method for supplying an ice / water slurry in the ice heat storage method according to claim 1, wherein the water level in the supercooling release pipe is kept constant by controlling a pump. 5. The ice storage method according to claim 4, wherein the pump is controlled based on a signal from a liquid level measuring device for detecting a water level in the subcooling release pipe.
How to supply water slurry. 6. The ice heat storage method according to claim 1, wherein water is taken from the heat storage tank by maintaining the subcooler below the water level in the heat storage tank. How to supply ice / water slurry.