JPH07113471B2 - Ice heat storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention eliminates a supercooled state of a regenerator material such as water or an aqueous solution to produce ice in the form of slurry and stores the ice in a heat storage tank. The present invention relates to an ice heat storage device.

(Prior Art) Conventionally, water or an aqueous solution as a regenerator is cooled to a supercooled state by a refrigerating device, and the supercooled state is canceled to produce slurry ice, which is stored in a heat storage tank. It is well known that an ice heat storage device that supplies the slurry ice to a heat exchanger such as an air conditioner at the time of use. As such an ice heat storage device, a conventional US patent
In Japanese Patent No. 4671077 and Japanese Patent Laid-Open No. 63-217171, a cool storage material outlet portion of a heat exchanger for supercooling generation is provided above a heat storage tank with a constant gap between the downstream end opening and the liquid surface in the heat storage tank. It is disclosed that the regenerator material is arranged so as to meet the requirement, and the regenerator material in a supercooled state flows down from the downstream end opening into the heat accumulator.

(Problems to be solved by the invention) When there is a gap between the downstream end opening of the heat exchanger outlet and the liquid surface of the heat storage tank, the supercooled state is eliminated in the heat storage tank and the outlet It is possible to prevent slurry-like ice from adhering to the part and to grow it up to the heat transfer tube of the heat exchanger, and to prevent the heat transfer tube from being blocked or damaged.

However, on the other hand, the positional relationship between the heat exchanger outlet and the heat storage tank is fixed, and the degree of freedom in design is low, and the downstream end opening of the heat exchanger outlet and the liquid surface of the heat storage tank are It is inevitable that the device becomes large in size because an extra space is required for the gap.

The present invention has been made in view of the above points, and an object thereof is to improve the arrangement and structure of the cool storage material outlet of the heat exchanger for supercooling generation to improve the heat exchanger receiving and outlet portions. While suppressing the adhesion of ice on the heat exchanger to prevent clogging and damage to the heat exchanger,
It is to increase the degree of freedom in device design and to make the device compact.

(Means for Solving the Problem) In order to achieve this object, in the invention of claim (1),
The outlet of the regenerator material of the heat exchanger is immersed in the regenerator material in the supercooling elimination tank so that the downstream end opening is located below the liquid surface of the regenerator material, and a flexible portion is provided at the outlet portion.

That is, as shown in FIG. 1, the present invention cools a cold storage material such as water or an aqueous solution to a supercooled state by heat exchange with the cooling material in a supercooling generation heat exchanger (11) and It is premised on an ice heat storage device in which a slurry-like ice generated by removing the supercooled state of the material is stored in the heat storage tank (1). Then, a subcooling elimination tank (4) for eliminating the supercooled state of the regenerator material is provided, and at least the downstream end portion of the regenerator material outlet portion (12) of the heat exchanger (11) is a flexible portion. The downstream end portion of the outlet portion (12) is located below the liquid surface of the regenerator material in the subcooling elimination tank (4).

In the invention of claim (2), the outlet of the heat exchanger is immersed in the regenerator material of the regenerator tank itself, and the supercooled state of the regenerator material is eliminated in this regenerator tank (1).

That is, according to the present invention, as shown in FIG. 3, the heat storage tank (1) eliminates the supercooled state of the cold storage material to generate ice in the form of slurry, and the ice is stored in the heat storage tank (1). In the ice heat storage device, the cold storage material outlet (1) of the heat exchanger (11)
At least the downstream end portion of 2) is a flexible portion, and the downstream end portion of the outlet portion (12) is located below the liquid surface of the regenerator material in the subcooling elimination tank (4). To do.

According to the invention of claim (3), in the invention of claim (1) or (2), at least the downstream end portion of the cool storage material outlet portion (12) of the heat exchanger (11) has a small adhesive force with ice. To form.

In the invention of claim (4), as shown in FIG. 2, a small diameter portion (12a) having a smaller passage cross-sectional area than other portions is provided at the downstream end portion of the cold storage material outlet portion (12) of the heat exchanger (11). To provide.

In the invention of claim (5), the temperature of the outlet of the heat exchanger is maintained at a temperature at which ice is unlikely to adhere, so that ice does not grow on the heat exchanger side. That is, according to the present invention, as shown in FIG. 1 or FIG. 3, the heat retaining means for maintaining the cool storage material outlet portion (12) of the heat exchanger (11) at a temperature slightly higher than the freezing point temperature of the cool storage material ( 13) is installed.

Further, in the invention of claim (6), the heat exchanger (11) for supercooling generation is configured to intermittently flow in the coolant.

(Operation) With the above configuration, in the invention of claim (1) or (2), the downstream end portion of the cool storage material outlet portion (12) of the heat exchanger (11) is the supercooling elimination tank (4) or the heat storage tank. Since it is immersed in the cold storage material in (1), the positional relationship between the heat exchanger (11) and the elimination tank (4) or the heat storage tank (1) is not limited, and the degree of freedom in design can be increased. . Further, there is no need for a gap from the liquid surface of the regenerator material in the solution tank (4) or the heat storage tank (1) to the outlet portion (12) as in the conventional case, and the device can be made compact by this amount.

Since the downstream end opening of the cold storage material outlet portion (12) is located below the liquid surface of the cold storage material, there is a risk that slurry-like ice will adhere to the cold storage material outlet portion (12). In these inventions, since at least the downstream end portion of the outlet portion (12) has flexibility, adhesion of ice to the outlet portion (12) is suppressed, and even if it adheres, the outlet portion (12) (12)
The ice will not be easily peeled off due to the deformation of ice, and ice will not grow on the upstream side to freeze or break the heat transfer tube of the heat exchanger (11).

In the invention of claim (3), at least the downstream end of the cold storage material outlet portion (12) is formed of a material having a small adhesive force with ice, so that it becomes difficult for ice to adhere to the downstream end portion, Can be effectively suppressed.

In the invention of claim (4), since the heat exchanger (11) is provided with the small diameter portion (12a) having a smaller passage cross-sectional area than the other portion at the downstream end portion of the cool storage material outlet portion (12), The small diameter part (1
The flow velocity of the regenerator material passing through 2a) is increased, and ice adhesion is prevented more effectively.

In the invention of claim (5), the inner wall surface of the outlet portion (12) is maintained at a temperature slightly higher than the freezing point temperature of the regenerator material by the heat retaining means (13). Therefore, it becomes difficult for ice to adhere to the outlet portion (12), and ice does not grow on the heat exchanger (11) side.

In the invention of claim (6), the heat exchanger (11) for generating subcooling
Since the cooling material intermittently flows into the cold storage material, the temporarily stored cold storage material passes through the outlet portion (12), and the adhesion of ice at the outlet portion (12) can be prevented.

(Example) Hereinafter, the Example of this invention is described based on drawing.

FIG. 1 shows an embodiment of the present invention, in which (1) is a heat storage tank opened upward for storing water as a cold storage material, and a drain port (2) is provided on the bottom wall of the heat storage tank (1). ) Is opened, and a first pipe (16) is connected to the drain port (2), and the first pipe (16) cools water to a subcooled state (7).
It is connected to the. (3) is a filter disposed on the inner bottom of the heat storage tank (1).

Further, (4) is a subcooling elimination tank which is installed separately from the heat storage tank (1) and is opened upward. Here, the subcooling state of the supercooled water from the refrigeration system (7) is eliminated. It produces slurry ice. A vibrator (5) vibrating by the output of the ultrasonic oscillator (5) is attached to the inner bottom surface of the supercooling elimination tank (4), and supercooling is performed by ultrasonic waves from the oscillator (5) at the initial stage of operation. A shock is given to the water, and the shock causes the supercooled state of the supercooled water to be removed to generate ice in the form of slurry, and after that, the ice formed is used as a core to continuously form ice in the form of slurry. I have to.

A discharge port (6) is opened in the bottom wall of the supercooling elimination tank (4), a second pipe (17) is connected to the discharge port (6), and the downstream end of the second pipe (17) is It opens below the water surface in the heat storage tank (1). The first pipe (16) is provided with a first pump (20) for circulation, and the second pipe (17) is provided with the second pump (21). Both pumps (20),
The water in the heat storage tank (1) is circulated between the refrigerating apparatus (7) by the operation of (21).

The refrigeration system (7) includes a compressor (8) for compressing a gas refrigerant (coolant), a condenser (9) for condensing and liquefying the gas refrigerant compressed by the compressor (8), and the liquid refrigerant. A decompression mechanism (10) for decompressing and a vaporizer (11) for vaporizing the decompressed liquid refrigerant are closed and connected in a cycle, and the vaporizer (11) constitutes a heat exchanger for supercooling generation. is doing. The water inlet of the evaporator (11) is connected to the downstream end of the first pipe (16), and the heat of evaporation of the refrigerant in the evaporator (11) cools the water to bring it into a supercooled state.

An upper end of an outlet pipe (12) as a cool storage material outlet is attached to the water outlet of the evaporator (11). The outlet pipe (12) is entirely made of a thin silicon tube having flexibility. Since this silicon tube does not have an oxide film on its surface unlike metal or the like, its adhesion to ice is small. The lower end of the outlet pipe (12), that is, the downstream end opening is located below the water surface of the water accumulated in the subcooling elimination tank (4).

Further, the outlet pipe (12) is provided with a heat retaining means (13) for keeping the inner wall surface of the outlet pipe (12) at a temperature slightly higher than the freezing point temperature of water. This heat retention means (13)
Has a tube (14) mounted concentrically around a portion of the outlet pipe (12) exposed to air,
An annular passage (15) is hermetically formed between the tube (14) and the outlet pipe (12). One end of a third pipe (18) is connected to the upper part of the annular passage (15), and the other end of the third pipe (18) is connected to the evaporator (11) and the first pump (20).
Is connected to the first pipe (16) between. On the other hand, one end of the fourth pipe (19) is connected to the lower part of the annular passage (15), and the other end of the fourth pipe (19) is opened below the water surface in the heat storage tank (1). Further, an opening / closing valve (22) is provided in the middle of the third pipe (18) and a heater (23
and a heating device (23) having a built-in a) is provided. When the opening / closing valve (22) is opened, the water in the heat storage tank (1) is heated by the heating device (23) and Circular passage (15)
The inner wall surface of the outlet pipe (12) is kept at a temperature slightly higher than the freezing point temperature of water by flowing it into the.

The use of the above embodiment will now be described.

By the operation of the first pump (20), the water in the heat storage tank (1) flows to the evaporator (11) through the first pipe (16) and is cooled by the evaporator (11) to become supercooled water. . The supercooled water flows down through the outlet pipe (12) into the supercooling elimination tank (4), and the supercooled state is eliminated by the impact of the ultrasonic oscillator (5) in the elimination tank (4), and the ice in the slurry state is removed. Is generated. This slurry ice is secondly fed by the second pump (21).
It is returned to the heat storage tank (1) through the pipe (17) and stored in the heat storage tank (1). Further, once the slurry-like ice is generated by the ultrasonic oscillator (5) in the supercooling elimination tank (4), the supercooled state of water is eliminated by using the ice as a nucleus, and the slurry-like ice is removed. Are continuously generated.

In this embodiment, since the lower end (downstream end opening) of the outlet pipe (12) is located below the water surface in the subcooling elimination tank (4), the lower end of the outlet pipe (12) is set above the water surface. The positional relationship between the evaporator (11) and the elimination tank (4) is not limited as in the case of arranging them at a distance, and the degree of freedom in design can be increased. Moreover, there is no need for a gap between the water surface of the dissolution tank (4) and the lower end of the outlet pipe (12), and the size of the ice heat storage device can be made compact.

Moreover, since the outlet pipe (12) is made of a thin-walled silicon tube having a small adhesion to ice, the outlet pipe (1
Although the downstream end opening of 2) is located below the water surface in the solution tank (4), ice adhesion to the outlet pipe (12) is suppressed. Further, since the outlet pipe (12) has flexibility, even if ice adheres to the downstream end of the outlet pipe (12),
Along with this, when the passage cross-sectional area of the downstream end portion becomes smaller and the water pressure rises, the downstream end portion of the outlet pipe (12) is bent and deformed as shown by the phantom line in the figure, and the deformation easily causes the ice to exit the outlet pipe ( It will come off from 12). Therefore, ice does not grow from the downstream end of the outlet pipe (12) to the upstream side and the heat transfer pipe in the evaporator (11) is not frozen or damaged.

Also, when necessary, the valve (22) of the heat retention means (13)
Open and the water heated by the heating device (23) flows through the annular passage (15) around the outlet pipe (12), so that the outlet pipe (12) has a temperature slightly higher than the freezing point temperature of the water inside it. Hold on. In this state, ice hardly adheres to the outlet pipe (12) maintained at the freezing point temperature or higher, and the above effect can be more reliably obtained.

Incidentally, the water in the heat storage tank (1) can be made to flow directly into the annular passage (15) which is heated by the heating device (23).

As the heat retaining means, the outlet pipe (12) is spirally covered with a heater wire such as a nichrome wire, and the heater wire is energized to heat the water in the outlet pipe (12). The structure like this can also be adopted.

Further, in the configuration of the above embodiment, as shown in FIG. 2, a small diameter portion (12a) having a passage cross-sectional area smaller than that of the other portion may be provided at the lower end portion (downstream end portion) of the outlet pipe (12). Good. By doing so, the flow velocity of the water passing through the small diameter portion (12a) becomes faster, and the adhesion of ice to the outlet pipe (12) can be prevented more effectively.

(Other Embodiments) FIG. 3 shows another embodiment (note that the same parts as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted).
The supercooling elimination tank (4) is omitted.

That is, in this embodiment, the downstream end of the outlet pipe (12) connected to the evaporator (11) is directly connected to the water in the heat storage tank (1) instead of the subcooling elimination tank (4) in the above embodiment. It is dipped and the downstream end opening of its outlet pipe (12) is located below the water surface of the heat storage tank (1). Therefore, also in this embodiment, it is possible to achieve the same effects as those of the above embodiment.

In each of the above embodiments, the compressor (8) of the refrigeration system (7) may be intermittently operated so that the refrigerant intermittently flows into the evaporator (11). Thus the evaporator (1
When the refrigerant intermittently flows into 1), the temperature of the water passing through the evaporator (11) rises temporarily, and the temperature of this raised water rises to the outlet pipe (12).
Since it passes through, it is possible to effectively prevent ice from adhering to the outlet pipe (12).

Further, in each of the above embodiments, the entire outlet pipe (12) of the evaporator (11) is made of a thin-walled silicon tube which is flexible and has a small adhesive force with ice. )
Of these, only the downstream end portion immersed in water in the supercooling elimination tank (4) or the heat storage tank (1) may be made of the same material.

Further, in each of the embodiments, the water is cooled to the supercooled state by the heat of vaporization of the refrigerant in the evaporator (11) of the refrigeration system (4), but the heat in the heat exchanger with the low temperature brine is The water may be cooled to a supercooled state by replacement. Further, an aqueous solution may be used instead of water as the cold storage material.

The heat exchanger for generating subcooling is not limited to the double-tube type heat exchanger as in each of the above-mentioned embodiments, and any form can be used as long as it can stably generate supercooling. For example,
A heat exchanger having a structure in which a pipe for circulating the coolant is spirally wound around the heat transfer pipe for circulating the cold storage medium may be used.

In addition, the outlet pipe (12) is made of a silicon tube having a small adhesion to ice, and is made of a synthetic resin pipe material having relatively high heat transfer performance and flexibility,
The outlet pipe (12) may be positively maintained at a temperature by embedding a heater wire therein. In addition, a short pipe made of resin having the above-mentioned characteristics is sandwiched between the upper and lower sides of the pipe by metal pipes and joined in a row, and the heater wire is embedded in the lower metal pipe (downstream outlet side) in an insulated state. It is also possible to form an outlet pipe consisting of In this case, it is possible to easily prevent freezing by energizing the heater wire even when the apparatus is stopped.

(Effects of the Invention) As described above, according to the invention of claim (1) or (2), at least the downstream end of the cool storage material outlet of the heat exchanger for subcooling generation in the refrigeration means has flexibility. After the portion is provided, the downstream end portion is arranged so as to be immersed in the liquid surface of the regenerator material in the subcooling elimination tank or the heat storage tank, so that the adhesion of ice to the outlet end downstream end due to the immersion becomes effective. While restraining and preventing freezing and damage of the heat exchanger, limit the positional relationship between the heat exchanger and the elimination tank or heat storage tank to increase the degree of freedom in equipment design and make the equipment compact. be able to.

In the invention of claim (3), the downstream end of the outlet of the heat exchanger for supercooling generation is formed of a material such as a silicon tube having a small adhesion to ice. Further, in the invention of claim (4), the outlet downstream end of the heat exchanger is limited to have a small diameter to accelerate the flow velocity of the regenerator material passing through the outlet. Further, in the invention of claim (5), the inner wall surface temperature of the outlet portion is kept at a temperature slightly higher than the freezing point temperature of the regenerator material. Further, in the invention of claim (6), the coolant is intermittently introduced into the heat exchanger for supercooling generation, and the regenerator material whose temperature has been temporarily raised passes through the outlet portion. Therefore, according to these inventions, it is possible to more effectively prevent ice from adhering to the cold storage material outlet of the heat exchanger.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, and FIG. 1 is a piping system diagram schematically showing the whole structure of the ice heat storage device, and FIG.
The figure is an enlarged sectional view showing a modified example of the outlet pipe. FIG. 3 is a view corresponding to FIG. 1 showing another embodiment. (1) …… Heat storage tank (4) …… Supercooling elimination tank (7) …… Refrigeration system (11) …… Evaporator (heat exchanger for supercooling generation) (12) …… Outlet piping (cooling material outlet Part) (13) …… Heat insulation

Claims (6)

[Claims] 1. A supercooling generation heat exchanger (11) cools a cold storage material composed of water, an aqueous solution or the like to a supercooled state by heat exchange with the cooling material, and eliminates the supercooled state of the cold storage material. An ice heat storage device configured to store the slurry-like ice generated by the heat storage tank (1) in a supercooling elimination tank (4) for eliminating a supercooled state of the regenerator material.
Is provided, and at least the downstream end portion of the cold storage material outlet portion (12) of the heat exchanger (11) has flexibility, and the downstream end portion of the outlet portion (12) has the supercooling elimination tank (4). ), The ice heat storage device is located below the liquid surface of the cold storage material. 2. A subcooling generation heat exchanger (11) cools a regenerator material such as water or an aqueous solution to a supercooled state by exchanging heat with the coolant, and a regenerator tank (1) stores the regenerator material. In an ice heat storage device in which a supercooled state is eliminated to generate slurry ice and the ice is stored in a heat storage tank (1), at least the cold storage material outlet portion (12) of the heat exchanger (11) is provided. The ice heat storage device, wherein the downstream end portion has flexibility, and the downstream end portion of the outlet portion (12) is located below the liquid surface of the cold storage material in the heat storage tank (1). 3. The heat exchanger (11) according to claim 1, wherein at least a downstream end portion of the cold storage material outlet portion (12) is formed of a material having a small adhesive force with ice. (2)
The ice heat storage device described. 4. A small diameter portion (12a) having a passage cross-sectional area smaller than that of other portions is provided at a downstream end portion of the cold storage material outlet portion (12) of the heat exchanger (11). The ice heat storage device according to claim (1), (2) or (3). 5. A heat retaining means (13) for retaining the cold storage material outlet (12) of the heat exchanger (11) at a temperature slightly higher than the freezing point temperature of the cold storage material. The ice heat storage device according to item (1), (2), (3) or (4). 6. The subcooling generation heat exchanger (11) is characterized in that the coolant is intermittently introduced into the heat exchanger (11), (2), (3), The ice heat storage device according to (4) or (5).