JPH0498096A - Ice heat accumulating device and heat accumulating method of ice - Google Patents

Abstract

PURPOSE:To prevent ice, reserved in a heat accumulating tank, from being introduced into a water sucking means and an ice making means by reserving non cold- accumulating material, whose specific gravity is set at an intermediate value between the cold heat accumulating material and the ice, in the heat accumulating tank. CONSTITUTION:When water-soluble liquid W, flowing through a water sucking pipe 3a, has arrived at an ice making tube 4c, the liquid is cooled in a cooling pipe 4b and becomes overcooled condition. Thereafter, when the liquid W is dropped and supplied into a heat accumulating tank 2 from the downstream end of the ice making tube 4c, the overcooled condition of the same is eliminated by the force of shock due to dropping and is changed into ice, then, is reserved in the heat accumulating tank 2 as heat accumulating medium. The produced ice I is separated from the water- soluble liquid W by oily liquid O and is precluded from being mixed with the layer of the water-soluble liquid whereby the ice I will never be introduced into the water sucking pipe 3a. Accordingly, the inflow of the ice I into the ice making means 4 and the elimination of the overcooled condition in the part are precluded whereby a predetermined ice making operation can be effected and the clogging of the water sucking pipe 3a and the ice making tube 4c by the ice I can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ice heat storage method for storing generated ice in a heat storage tank, and an ice heat storage device used in the ice heat storage method.

(Prior art) In recent years, thermal storage air conditioning systems have been used in relatively large-scale air conditioning systems in industrial plants, buildings, etc. As an example of the thermal storage method of this thermal storage air conditioning system,
The ice heat storage method is known to be highly safe and economical.

In addition, as this ice heat storage method, for example, JP-A-63-2
As shown in Japanese Patent No. 17171, a method (generally called a dynamic method) that generates ice without adhering it to a cooling surface is attracting attention.

As an example of this method, a water-soluble liquid is stored as a cold storage material for ice making in a heat storage tank, and this water-soluble liquid is led out through a water suction pipe, and while flowing through this water suction pipe, It is cooled down to a supercooled state in the supercooling section. After that, this supercooled water-soluble liquid is dropped and supplied into the heat storage tank, and the impact force caused by this drop eliminates the supercooled state of the water-soluble liquid, thereby producing ice as a heat storage medium.
This ice is suspended and stored in the upper layer of the water-soluble liquid in the heat storage tank.

(Invention or problem to be solved) However, in the method described above,
Because ice and water-soluble liquid coexist in the heat storage tank and are stored in a state where the ice layer and the aqueous solution layer are in contact with each other, it is easy for ice to mix into the water-soluble liquid layer, and this mixed ice Sometimes it was discharged together with water-soluble liquid into the water suction pipe and led to the supercooling section. In this way, when ice is introduced into the supercooled section, the water-soluble liquid in this supercooled section is desupercooled near the surface of the ice, and turns into ice in this supercooled section, preventing the prescribed ice-making operation. I can't do it anymore and it's not good. In some cases, the water pipes may become clogged with ice.

In order to solve this problem, it has been proposed to install a heater upstream of the supercooling section to melt the ice in the water suction pipe. I don't like it in terms of aspects either. It also leads to a complicated structure. Additionally, a filter or the like may be provided to prevent the flow of water to the water suction pipe, but this is not practical as the filter may become clogged with ice.

The present invention has been made in view of these points, and
It is an object of the present invention to provide an ice heat storage method and an ice heat storage device used therein, which have a simple structure and prevent ice in a heat storage tank from being guided to a supercooled part.

(Means for Solving the Problems) In order to solve the above object, in the present invention, a non-cold storage material is stored in a heat storage tank, and the non-cold storage material is used to separate the cold storage material and ice. Specifically, the invention according to claim (1), as shown in FIG. ), a water absorption means (3) whose at least one end communicates with the heat storage 1 (2) and which draws out the cold storage material (W), and a water absorption means (3) which draws out the cold storage material (W) by the water absorption means (3), and supercools the cool storage material (W) drawn out by the water absorption means (3). After cooling to
1) and supplying the ice (1) to the heat storage tank (2).

Then, the specific weight is such that the cold storage material (W) and the ice (1) in the heat storage tank (2) are separated and stored in the heat storage tank (2). The configuration was such that the non-cool storage material (O) set to the intermediate value of 1) was stored.

The invention according to claim (2), as shown in FIG. A water absorption means (3) whose at least one end is connected to the side wall of the heat storage tank (2) and which draws out the cool storage material (W), and a water absorption means (3) which cools the cool storage material (W) drawn out by the water absorption means (3) to a supercooled state. After that, this supercooling state is canceled to generate ice (1), and the ice making means (4) is provided for supplying the ice (1) to the heat storage tank (2). In the heat storage tank (2), the heat storage tank (2)
To store the cold storage material (W) and ice (1) separately, the non-cold storage material (O) whose specific weight is set to an intermediate value between the cold storage material (W) and ice (1) is stored. are doing. Furthermore, a heat storage chamber (2b) for storing ice (1), and a discharge chamber (disposed closer to the water absorption means than the heat storage chamber (2b) for storing a cold storage material (W) to be led out to the water absorption means (3)). 2c) and a partition wall (2a) that partitions the inside of the heat storage tank (2).

The invention according to claim (3) stores a cold storage material (W) made of water or an aqueous solution for ice making in a heat storage tank (2), and uses water absorption means to absorb the cold storage material (W) in the heat storage tank (2). (3), this cold storage material (W) is cooled to a supercooled state by an ice making means (4), and then the supercooled state is eliminated to generate ice (1). The heat storage tank (
2). In addition, by storing a non-cold storage material (O) whose specific weight is set to an intermediate value between the cold storage material (W) and ice (I) in the heat storage tank (2), the cold storage material (W) This is an ice heat storage method in which ice (1) is separated and stored.

(Actions) The effects of the configurations of the inventions according to each of the above claims are as described below.

In the inventions according to claims (1) and (3), the cold storage material (W) in the heat storage tank (2) is drawn out by the water absorption means (3), and this cold storage material (W) is drawn out by the ice making means (4). After cooling to a supercooled state, this supercooled state is canceled and ice (1)
This ice (1) is stored in a heat storage tank (2). In the heat storage tank (2), the specific weight is the cold storage material (W).
Since the non-cold storage material (O) is stored at an intermediate value between the non-cold storage material (O) and the ice (1), the non-cold storage material (O) separates the cold storage material (W) and ice (1). stored. As a result, the ice (I) is prevented from mixing with the cold storage material (W), and the ice (I) stored in the heat storage tank (2) is removed from the water absorption means (3) and the ice making means (4). derived or prevented.

In the invention according to claim [2], heat storage $'! ! (
The ice (1) stored in the heat storage chamber (2b) of 2) is prevented from entering the extraction chamber (2c) by the partition wall (2a), and is further connected to the side wall of the heat storage tank (2). Ice (1) is prevented from being led out to the water absorption means (3).

As a result, together with the effect of the invention according to claim (1), the water (1) stored in the heat storage tank (2) can be led out to the water absorption means (3) and the ice making means (4). or will definitely be prevented.

(No. 1 Example) Next, a first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the ice heat storage device (1) in this example mainly includes a heat storage tank (2), water absorption means (3), and ice making means (4).

The heat storage tank (2) is a box with an open top, and serves as a so-called heat storage portion in which generated heat storage ice (1) is stored. Further, inside the heat storage tank (2), a water-soluble liquid (W) as a cold storage material for ice making and an oily liquid (O) as a non-cold storage material are stored. In addition, this heat storage tank (2
) is connected to the cooling load (5), and during cooling operation, the stored ice (1) melts and heat is radiated. The water absorption means (3) is connected to the lower surface of the heat storage tank (2).

The water absorption means (3) includes a water absorption pipe (3a) and a water absorption pipe (3a).
) and a manual on-off valve (3c), and the upstream end of the water suction pipe (3a) is connected to the lower surface of the heat storage tank (2). In addition, the manual on-off valve (3c) is opened during ice making operation and the water suction pipe (3a) is opened during ice making operation.
) to allow the flow of the water-soluble liquid (W) into the water-soluble liquid (W).

The ice making means (4) includes a refrigeration circuit in which a compressor, a condenser, etc. (not shown) are connected in series by a refrigerant pipe (4a), and a cooling pipe (4b) for evaporating the refrigerant of this refrigeration circuit.
) is arranged so as to be in contact with the outer peripheral surface of the ice-making tube (4C). Furthermore, the upstream end of the ice-making pipe (4c) is connected to the water absorption pipe (3a), and the downstream end is opened and extends above the heat storage tank (2), so that the water-soluble liquid (W) is transferred to the heat storage tank. The heat storage tank (2) is supplied by falling from above the heat storage tank (2). The ice-making means (4) cools the water-soluble liquid (W) flowing through the ice-making tube (4C) to a supercooled state, and eliminates the supercooling by supplying it dropwise to the heat storage tank (2) to make ice. It is supposed to be done.

Next, the water-soluble liquid (W) and oil-based liquid (O) stored in the heat storage tank (2) will be explained.

The water-soluble liquid (W) is a so-called brine aqueous solution made by mixing water with an antifreeze such as ethylene glycol, and its specific weight is set to approximately 1.0.
) is turned into ice (I), which is produced in the form of a slurry.

On the other hand, the oily liquid (O) is water-insoluble and non-volatile, and specifically those shown in the table below are employed. As shown in the same table, its specific weight is set to 0.92 to 1.0, which is an intermediate value between the water-soluble liquid (W) and ice (I). In this table, d
20 indicates the specific weight at 20°C, hereinafter d)
4. (15+dO, d13 indicates the specific weight at each temperature.

As a result of (2), each stored material (1) (O) is in the heat storage tank (2).
, (W), an ice layer, an oily liquid layer, and a water-soluble liquid layer are formed from the top. That is, the ice (1) in the top layer is converted into a water-soluble liquid (O) by an oily liquid (O).
W) and are prevented from mixing with the aqueous liquid layer.

Next, the operation of the apparatus (1) configured as described above will be explained together with the ice heat storage method according to claim (3).

The manual on-off valve (3c) of the water suction means (3) is opened, and the water pump (3b) is driven to drain the water-soluble liquid (W) in the heat storage tank (2) from the upstream end of the water suction pipe (3a). Derive. Also, the ice making means (4) is driven and the cooling pipe (4) is driven.
The refrigerant in b) and the water-soluble liquid flowing through the ice-making tube (4c)
W) to perform heat exchange.

In such a driving state, when the water-soluble liquid (W) flowing through the water absorption pipe (3a) reaches the ice-making tube (4C), the water-soluble liquid (W) becomes a refrigerant that evaporates in the cooling pipe (4b). It is cooled by heat exchange between the In this way, the water-soluble liquid (W) is transferred to the heat storage tank (2) and the water absorption means (3).
and the ice making means (4), and through this circulation, the water-soluble liquid (W) is brought into a supercooled state in which it maintains a liquid phase below freezing point. Thereafter, the supercooled water-soluble liquid (W) flows downstream through the ice-making tube (4C) and is supplied from the downstream end into the heat storage tank (2). Then, due to the impact force caused by this fall, the water-soluble liquid (W) loses its supercooled state and turns into ice, and the ice produced here (
1) is stored in a heat storage tank (2) as a heat storage medium. Moreover, this ice (1) is in the form of a slurry and has good ability to follow the cooling load.

As mentioned above, this generated ice (1) is separated from the water-soluble liquid (W) by the oily liquid (O) and is prevented from mixing with the water-soluble liquid layer, so it absorbs water. It is not led out to the pipe (3a). Therefore, it is possible to carry out the prescribed ice-making operation without the ice (1) flowing into the portion where the ice-making means (4) is disposed and the overcooling state being eliminated in this portion.
3a) and the ice-making tube (4c) are prevented from becoming clogged with ice (1).

In this way, in the present device and the present ice heat storage method, since the ice (1) does not flow into the water absorption pipe (3a),
There is no need to provide the water suction pipe (3a) with a heater for melting the ice (1), a filter for blocking the flow of the ice (I), etc., and a predetermined ice-making operation can be obtained with a simple configuration.

(Second example) Next, a second embodiment of the present invention will be described.

However, in this example, we will focus on the differences from the first example described above.

As shown in FIG. 2, the upstream end of the water suction pipe (3a) of the water suction means (3) in this example is connected to a substantially central portion in the vertical direction of the side wall of the heat storage tank (2). Also, heat storage T! (2) is provided with a partition wall (2a) inside thereof. This partition wall (2a) is located at a water absorption pipe (
3a) and at a position with a predetermined distance between it and the side wall of the heat storage tank (2).
) is formed so that a gap exists between the bottom end of the heat storage tank (2) and the bottom surface of the heat storage tank (2). In other words, through this partition wall (2a), the inside of the heat storage tank (2) is divided into a heat storage chamber (2b) where ice (1) is stored, and a water-soluble liquid (W) which is guided to the water absorption pipe (3a). The heat storage chamber (2b) and the extraction chamber (2c) are separated by a partition wall (2a).
) is connected below.

And even in the device (1) configured in this way,
Similar to the effect in the first embodiment described above, the oil-based liquid (
O) prevents ice (1) from being mixed into the aqueous liquid layer. Not only that, but the heat storage chamber (2b
) ice (1) is extracted from the extraction chamber (2c) by the partition wall (2a).
The water intake pipe (3a
) can now be more reliably blocked.

In this way, in the present device (1), the water suction pipe (3a)
Even if the ice (1) is connected to the side wall of the heat storage tank (2), it is possible to reliably prevent the ice (1) from flowing into the water suction pipe (3a) and the ice making pipe (4C), and the predetermined supercooling elimination operation can be performed. There are two things you can do to make sure you get it.

Further, the partition wall (2a) is limited to a plate-like member, and only the portion corresponding to the ice layer and the oily liquid layer may be plate-shaped, and the lower part thereof may be formed into a net shape.

In addition, in each of the above examples, the supercooled water-soluble liquid (W)
is supplied dropwise from above the heat storage tank (2), and supercooling is eliminated by the impact force caused by the drop. However, the present invention is not limited to this, and a separate A means for eliminating supercooling may be provided. Furthermore, the cold storage material is not limited to an aqueous brine solution, and water alone may be used.

(Effects of the Invention) As described above, according to the present invention, the following effects are achieved.

In the ice heat storage device according to the invention described in claim (1), the non-cold storage material whose specific weight is set to an intermediate value between the cold storage material and ice is stored in the heat storage tank, so that the cold storage material and the ice The ice is separated and stored using a non-cold storage material, and this prevents the ice stored in the heat storage tank from flowing into the water absorption means and ice making means, making it possible to perform continuous ice making operation, and the equipment The reliability of the system can be improved.

In the ice heat storage device according to the invention described in claim (2), by providing a partition wall that partitions the inside of the heat storage tank into a heat storage chamber and a discharge chamber, ice stored in the heat storage chamber of the heat storage tank can be discharged. This prevents ice from entering the chamber and reliably prevents ice from flowing into the water absorption means and ice making means.

In the ice heat storage method according to the invention described in claim (3), the cold storage material and ice are separated and stored by the non-cold storage material, thereby preventing ice from mixing with the cold storage material,
It is possible to prevent the ice stored in the heat storage tank from flowing out to the water absorption means and the ice making means.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an ice heat storage device according to a first embodiment of the present invention, and FIG. 2 is a circuit diagram of an ice heat storage device according to a second embodiment of the present invention. (1)... Ice heat storage device (2)... Heat storage tank (2a)... Partition wall (2b)... Heat storage chamber (2C)... Output chamber (3)... Water absorption means...・Ice making means

Claims (3)

[Claims] (1) A heat storage tank (2) for storing a cold storage material (W) made of water or an aqueous solution for ice making, and ice for heat storage (I), at least one end of which is in communication with the heat storage tank (2); A water absorbing means (3) for deriving W) and a cold storage material (W) derived by the water absorbing means (3) are cooled to a supercooled state, and then the supercooled state is canceled to generate ice (I). and the ice (I)
and an ice making means (4) for supplying ice to the heat storage tank (2);
In order to separate and store W) and ice (I), a non-cold storage material (O) with a specific weight set to an intermediate value between the cold storage material (W) and ice (I) is stored. Features: Ice heat storage device. (2) A heat storage tank (2) for storing a cold storage material (W) made of water or an aqueous solution for ice making and ice for heat storage (I), and at least one end connected to the side wall of the heat storage tank (2), for storing cold Material (W)
a water absorbing means (3) for deriving the water; and after cooling the cold storage material (W) derived by the water absorbing means (3) to a supercooled state, the supercooled state is canceled to generate ice (I); an ice making means (4) for supplying the ice (I) to the heat storage tank (2);
In order to separate and store W) and ice (I), a non-cold storage material (O) whose specific weight is set to an intermediate value between the cold storage material (W) and ice (I) is stored, and A heat storage chamber (2b) for storing ice (I);
) is provided with a partition wall (2a) that partitions the heat storage tank (2) from a discharge chamber (2c) that is disposed closer to the water absorption means and stores the cool storage material (W) to be led out to the water absorption means (3). An ice heat storage device characterized by: (3) A cold storage material (W) made of water for ice making, water-soluble liquid, etc. is stored in the heat storage tank (2), and the cold storage material (W) in the heat storage tank (2) is drawn out by the water absorption means (3). After that, the derived cold storage material (W) is cooled to a supercooled state by the ice making means (4), and then this supercooled state is eliminated to generate ice (I), and this ice (I) is used as the heat storage material. While being stored in the tank (2), a non-cold storage material (O) whose specific weight is set to an intermediate value between the cold storage material (W) and ice (I) is stored in the heat storage tank (2).
An ice heat storage method characterized in that the cold storage material (W) and the ice (I) are separated and stored using the non-cold storage material (O).