JPH0297845A - Ice making method and ice heat accumulator - Google Patents

Abstract

PURPOSE:To make it possible to produce ice efficiently without enclosing an ice making container and a heat accumulator by bringing non water soluble liquid into direct contact with water in order to cool said water and generating slurry-like ice at the same time while agitating water. CONSTITUTION:A refrigerant compressed by a compressor 8 is condensed by a condenser 9 and liquefied therein. Then, it is vaporized in vaporizers 11and 13, then it cools oil O. The oil O is brought into direct contact with water W positioned above and exchanges heat efficiently by agitating motion. The water W is cooled uniformly so that it may turn into excess cooling state. When this excess cooling state is cancelled by the impact of air E, the water W is frozen into ice, thereby generating slurry-like fine ice in the water layer. This ice I is fed into a heat accumulator 3 from a communication pipe 4. This construction prevents the generation of refrigerant leakage and the drop in the ice making capacity induced by mixed air even when an ice making container 2 and the heat accumulator 3 do not comprise an enclosed vessel.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an ice-making method in which ice is cooled and turned into ice by direct contact between a water-insoluble liquid as a heat transfer medium and water, and the ice-making method. The present invention relates to an ice heat storage device that is used for storing the generated ice in a heat storage tank.

(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., to reduce power demand during peak cooling load times and increase power demand during off-peak times. I have to.

The heat storage methods of this heat storage air conditioning system include a water heat storage method that uses sensible heat and an ice heat storage method that uses latent heat.
The former water heat storage method has the disadvantage that it cannot be effective unless the heat storage tank is enlarged.
In addition, demand for the ice heat storage method is increasing due to its safety and economic efficiency.

The most common type of air conditioning system that has adopted this ice heat storage method is called a static system, and as shown in Figure 3, a storage tank (a) containing an aqueous solution such as brine is used. A cooling pipe (c) for evaporating refrigerant in the refrigeration circuit (b) is introduced and arranged inside the refrigeration circuit (b), and the refrigeration circuit (b) is connected to a compressor (d) and a condenser (e) through the cooling pipe (c).
), which is connected in turn to the cooling pipe (c) via the expansion valve (f) in a closed circuit. The refrigerant in the refrigeration circuit (b) is compressed by the compressor (d), then condensed by the condenser (e), and then supplied to the cooling pipe (C) via the expansion valve (f). The refrigerant exchanges heat with the aqueous solution in the storage tank (a) in the cooling pipe (c) and evaporates, while the aqueous solution is cooled and the water in the aqueous solution is brought down to the freezing point on the surface of the cooling pipe (c). The ice is generated by cooling the container to a temperature of 100 ml, and the thorn trees are sequentially grown, and the heat is stored as a heat storage medium in the storage tank (a). On the other hand, a refrigeration load (h) is connected to the storage tank (a) via a cold water pump (g), and the aqueous solution cooled by ice in the storage tank (a) is transferred to the refrigeration load (h).
h) and used for cooling the refrigeration load (h). Further, (i) is an air pump that supplies air to the aqueous solution to cause bubbling, and is used to increase the melting speed of ice.

However, in this system, the ice adhering to the cooling pipe (C) becomes a thermal resistance, and as the thickness of the ice increases, the heat transfer performance deteriorates, resulting in a drawback that the C0P of the system decreases. Therefore, as a conventional technique to solve this problem, an ice making method (generally a dynamic method) that does not generate ice around the cooling pipe, as shown in Japanese Patent Laid-Open Nos. 61-272539 and 62-268972, is proposed. ) is attracting attention. In this method, a refrigerant liquid is directly injected into the water to evaporate it, and the latent heat of evaporation cools the water to generate ice, which then stores the thorns in a closed heat storage tank. Further, as another conventional example, there is also the one shown in Japanese Patent Laid-Open No. 63-46392.

What is shown here is a system that uses the reduced pressure boiling of a refrigerant to cool water and generate ice, i.e., a natural circulation cycle that changes the refrigerant's gas-liquid phase in a closed container without requiring external power. This is a cold storage/radiation method that uses direct contact heat transfer with water or ice.

(Problem to be solved by the invention! 0) However, in any of the above-mentioned systems, the ice storage section, that is, the heat storage tank is used to store the refrigerant in the heat storage tank. Since it utilizes liquid phase change, it needs to be a sealed container, and if the degree of sealing decreases, the ice-making capacity will decrease due to refrigerant leakage or air intrusion, so it is difficult to maintain the airtightness of the heat storage tank. requires careful attention, and its maintenance and management are complicated. Therefore, the present invention
The object of the present invention is to obtain an ice making method and an ice heat storage device that can make ice without the need for a closed container by using a water-insoluble liquid heat transfer medium.

(Means for Solving the Problems) In order to solve the above objects, the present invention takes the following measures.

The invention according to claim (1) uses a heat storage tank (3) as a heat storage medium.
) is an ice-making method for making ice (1) stored in an ice-making container (2), in which water (W) for ice making and a water-insoluble liquid (O) are stored in an ice-making container (2), and the water-insoluble liquid (O) is stored in an ice-making container (2). O) and the cooling means (
6), the cooled water-insoluble liquid (
The water (W) is cooled by direct contact between O) and the water (W), and at the same time, the Ibaraki (W) is stirred by the stirring means (E) to generate slurry ice (1). This is an ice making method.

The invention according to claim (2) provides an ice-making container (2) in which a water-insoluble liquid (O) having a specific gravity of more than 1 and water (W) are stored in direct contact with each other; The ice making container (2) and the heat storage tank (3) are connected to the heat storage tank (3) in which the ice is stored, and the ice CI in the ice making container (2) is transferred to the heat storage tank (3). Ice feeding means (4) and a heat storage tank (
3) Water return means (5) for returning the water (W) inside to the ice making container (2)
), a refrigeration circuit (6) equipped with a heat exchanger (13) immersed in the water-insoluble liquid (O) in the ice-making container (2) to cool the water-insoluble liquid (O), and an ice-making container (2). 2) and an air supply means (7) having a supply port (7b) opened at the bottom thereof and supplying air (E) for water stirring.

The invention according to claim (3) provides two types of water-insoluble liquids (LO), (HO) and water (HO), which have a specific gravity lower and higher than water.
W) an ice making container (22) stored in direct contact with the ice making container (22);
A heat storage tank (23) in which the ice (1) generated in the ice making container (22) is stored, and the ice making container (22) and the heat storage tank (2)
ice feeding means (24) that connects the ice making container (22) to the heat storage tank (23) and supplies the ice (1) in the ice making container (22) to the heat storage tank (23);
3) Water return means (
25) and a low specific gravity water-insoluble liquid (23) in the heat storage tank (23).
liquid return means (28) for returning the LO) to the ice making container (22);
Low specific gravity water-insoluble liquid (L) in the ice making container (22)
The water-insoluble liquid (LO) is transferred from the reservoir layer of LO to the ice making container (
22) to the lower part (22b) of the non-aqueous liquid (LO
); and a heat exchanger (32) installed in the middle of the water-insoluble liquid circulation means (27) to cool the water-insoluble liquid (LO). This is an ice heat storage device consisting of a circuit (26).

The invention according to claim (4) is the ice heat storage device according to claim (3), which includes liquid return means (28) of the heat storage tank (23).
This is an ice heat storage device in which a float device (F) for opening and closing the connecting portion (28a) is provided at the connecting portion (28a).

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

In the invention according to claim (1), first, an ice making container (
Cooling means (6) for cooling the non-aqueous liquid (O) stored in 2)
The water (W) is cooled by the cooled water-insoluble liquid (O). At the same time as this cooling, the water (W) is stirred by a stirring means (E) such as air, uniformly cooled to form supercooled water, and this supercooled state is eliminated by the air etc. Produces more slurry ice.

On the other hand, in the invention according to claim 2, a refrigeration circuit (
6) is cooled by evaporation of the refrigerant in the heat exchanger (13), and the water (W
) to cool the Ibaraki (W), and also feed stirring air (E) from the air supply means (7) into the ice making container (2) to cool the Ibaraki (W). The Ibaraki (W) is uniformly cooled by promoting heat exchange between the water (W) and the water (W) to form supercooled water, and this supercooled state is eliminated to form slurry ice (1).
generate. After that, ice (1
) is transported to the heat storage tank (3) by the ice feeding means (4) and stored therein, while the water (W) stored in the heat storage tank (3) by melting ice etc.
is returned to the ice making container (2) again by the water returning means (5). For this reason, there is no need to make the ice making container (2) and the heat storage tank (3) airtight containers, and there is no problem of ice making capacity decreasing due to refrigerant leakage or air contamination as in the past, making maintenance management easier. is easy.

In addition, in the invention according to claim (3), the low specific gravity water-insoluble liquid (LO) stored in a layer above the water is circulated by the water-insoluble liquid circulation means (27), and at the same time, during the circulation It is cooled by evaporation of the refrigerant in the refrigeration circuit (26), and the cooled low specific gravity water-insoluble liquid (LO) passes through the water (W) using its low specific gravity and comes into direct contact with the ibaraki (W). Water (
W) is cooled and frozen to produce slurry ice. The generated ice has a low specific gravity and is separated from water by a water-insoluble liquid (HO) with a low specific gravity, so it is easy to take out only the ice from the ice making container, so it is not necessary to put it into the heat storage tank. Since only ice is supplied, it has good heat storage efficiency.

Furthermore, in the invention according to claim (4), the heat storage tank (2
The connection part (28a) of the layer liquid means (28) in 3) is provided with a float device (F) that opens and closes the connection part (28a), so that the low temperature mixed in the heat storage tank (23) can be removed. Recovery of specific gravity non-aqueous liquid (LO) is ensured.

(First example) Next, a first embodiment of the present invention will be described using FIG.

As shown in Fig. 1, this ice heat storage device (1) has an ice making container (
2), heat storage tank (3), communication pipe (4), water return pipe (5),
The main parts are a refrigeration circuit (6) and an air supply pipe (7).

Each part will be explained below.

The ice-making container (2) is a box with an open top, and inside it contains water for ice-making (W) and a non-water-soluble liquid (O) as a heat transfer medium for cooling the Ibaraki (W). It is stored.

The upstream end (4a) of the communication pipe (4) and the downstream end (5b) of the return pipe (5) are connected to the side wall (2a), respectively, and a position corresponding to the oil layer below is connected to the side wall (2a). The second evaporator (13) of the refrigeration circuit (6) is located, and one end of the air supply pipe (7) is connected to the bottom (2b). In addition, each of these parts (4), (5) (6)
As can be seen from FIG. 1, the connection positions of the ice-making container (2) are set in advance in accordance with the liquid layers of the respective liquids stored in the ice-making container (2). That is, the upstream end (4a) of the communication pipe (4) and the downstream end (5b) of the water return pipe (5) are ice layers, and both (4)
a) and (5b) are connected so as to face each other, and a refrigerant supply port (6a) to the second evaporator (13) of the refrigeration circuit (6)
, the outlet (6b) is correspondingly connected to the oil layer.

The heat storage tank (3) stores ice (1) generated in the ice making container (2).
) is supplied and stored, and its side wall (3a) is connected to the downstream end (4b) of the communication pipe (4), and the bottom (3b) is connected to the water return pipe (5). The upstream end (5a) of is connected. Moreover, the heat storage tank (3) is
A cooling load (not shown) is connected, and during cooling operation, stored ice (1) is melted and heat is radiated.

The connecting pipe (4) connects the ice making container (2) and the heat storage tank (3), and transfers the ice (1) generated in the ice making container to the heat storage tank (3).
As mentioned above, the upstream end (4a)
The connection position corresponds to the ice layer of the ice making container (2). Moreover, the downstream end (4b) connected to the heat storage tank (3) is located at the upper part of the side wall of the heat storage tank (3).

The water return pipe (5) guides the water (W) in the heat storage tank (3) to the ice making container (2) (and makes ice by the dynamic pressure of the water (W) returned to the ice making container (2)). Ice (1) in container (2)
As mentioned above, the connection position of the downstream end (5b) corresponds to the ice layer of the ice making container (2), and the connection position of the downstream end (5b) corresponds to the ice layer of the ice making container (2). is a water circulation pump (Pl) and a heat storage tank (Pl) for generating water flow.
3) An opening/closing valve (■1) is provided which is opened when the water (W) inside is returned to the ice making container (2).

The refrigeration circuit (6) uses oil (
O), the compressor (8), condenser (
9), first expansion valve (10), first evaporator (11), second
An expansion valve (12) and a second evaporator (13) are connected in series by refrigerant piping. The second evaporator (13) is arranged so as to immerse the oil in the ice making container.

The air supply pipe (7) supplies stirring air (
E), the air pump (P2),
A heat exchange section (H) is equipped with an on-off valve (v2), and a part of its piping exchanges heat with the first evaporator (11).
It becomes. Also, the ice making container (2) of the air supply pipe (7)
) is connected to a plurality of branched air jet nozzles (7
a).

(7a)..., and the air jet nozzle (7a)...
a) The jet ports (7b), (7b), etc. at the tips are equipped with check valves (not shown). Specific examples of the check valve include a check valve containing a steel ball, a plate-shaped valve body that can be opened in only one direction, and the like.

Next, each liquid stored in the ice making container (2), which is a feature of the present invention, will be explained. The inside of the ice making container (2) consists of three layers, one solid layer and two liquid layers, that is, an ice layer, a water layer and an oil layer during ice making. The oil (O) constituting the oil layer has a higher specific gravity than water (W), and is not only water-insoluble but also non-volatile. Specifically, fluorine-based oil or silicone oil is used. In addition, this oil (O) should preferably have a low viscosity, that is, close to the viscosity of water, in order not to reduce the flow rate necessary for the stirring action of the stirring air (E) from the air supply pipe (7). . Furthermore, the oil (O) is used to prevent ice from adhering to the area around the nozzle due to contact between the nozzle (7b) of the air nozzle (7a) and water (W), and from clogging caused by this. is also contributing.

Next, the operation of the above configuration will be explained together with the ice making method according to claim (1). Note that the operation of this device consists of an ice-making operation and a stirring operation.

First, the ice making operation will be explained. In the refrigeration circuit (6), the refrigerant compressed by the compressor (8) is condensed and liquefied in the condenser (9), passes through the first expansion valve (10), and then flows into the first evaporator (11). After a part of it is evaporated, the second expansion valve (
12), is further evaporated in a second evaporator (13), is returned to the compressor (8), and circulates within the refrigeration circuit (6). The refrigerant evaporated in the second evaporator (13) cools the oil (O) through heat exchange with the oil (O). Since the oil (O) is in direct contact with the water (W) located above it, heat exchange is also performed with the ibaraki (W), thereby cooling the ibaraki (W). In other words, the water < W) is cooled by the evaporation of the refrigerant in the second evaporator (13) using oil (O) as a heat transfer medium. At this time, oil (O) and water (W) efficiently exchange heat by the stirring operation described later, and water (W) is uniformly cooled. And that water (W)
is cooled and becomes a supercooled state, and this supercooled state becomes air (
When the water (W) is dissolved by the impact of E), the water (W) is frozen and a slurry-like fine ice is generated in the water layer, and as this ice-making operation progresses, the generated ice ( Since I) has a lower specific gravity than water (W), it floats to the top layer and forms an ice layer. This is the cooling operation of this device. On the other hand, the stirring operation is performed by driving the air pump (P2) and opening/closing valve (
v2) and blow out the air from the atmosphere through the air nozzle (7).
The liquid is ejected from the spout (7b) of a) into the ice making container (2) and is stirred through each of the liquids (O) and (W) in the ice making container (2) to efficiently exchange heat between the two. At the same time, it promotes uniform cooling of water (W). At this time, the air (E) sent from the air pump (P2) passes through the first evaporator (11
) The generated ice is precooled by heat exchange with the refrigerant that evaporates in ) and is then fed into the ice making container (2) by the amount of heat of the air (E) that is blown into the ice making container (2). It will not melt, that is, it will not adversely affect the ice-making operation. In addition, this stirring operation
It also serves to prevent the generated ice (1) from coalescing into ice blocks. The air (E) after the stirring is either released into the atmosphere from the ice making container (2) or sent to the air pump (P2) again for reuse. In this way, in the operation of this device, the cooling operation and the stirring operation described above work together to make ice with high efficiency.

After performing the ice-making operation and stirring operation for a certain period of time, the water circulation pump (Pl) is driven and the on-off valve (vl) is opened to release the water (W) in the heat storage tank (3).
Water is supplied to the ice layer of the ice making container (2) through the water return pipe (5). Due to the water flow pressure of the supplied water, the ice (I) floating on the top layer in the ice making container (2) is sent to the connecting pipe (4) side, and from the connecting pipe (4) to the heat storage tank (3). will be sent. When a predetermined amount of ice (1) in the ice making container (2) is fed into the heat storage tank (3), the water circulation pump (Pl)
At the same time, the on-off valve (Vl) is closed, and the heat storage operation is completed. Furthermore, at the end of this heat storage operation, the on-off valve (v2) is closed to prevent oil (O) from entering the air supply pipe (7). Incidentally, when the ice (1) described above is fed, oil (O) may be sent into the heat storage tank (3) together with the water (1), but the oil sent into the heat storage tank (3) (
O) has a higher specific gravity than water (W), so the heat storage tank (3
), the water will be retained at the bottom of the water circulation pump (Pl
) can be easily returned to the ice making container (2) side. In this way, the present device and the present ice-making method do not require the ice-making container (2) and the heat storage tank (3) to be constructed as closed containers, and prevent refrigerant leakage and air leakage as in the conventional method. Not only does it not cause a decrease in ice-making capacity due to contamination, but since the cooling pipe does not come into contact with water unlike in conventional static systems, there is no decrease in ice-making capacity due to ice adhering to the cooling pipe. It is something. In addition, since the ice (1) generated in the ice making container (2) is prevented from turning into ice blocks due to the stirring operation, during heat dissipation (
When ice is melted), it can quickly follow changes in cooling load.

In this example, the oil (O) used as the heat transfer medium was a single component, but in addition, fine metal powder was mixed into the oil with a specific gravity of less than 1, or a solvent with a specific gravity of more than 1 was added. It may be mixed.

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

Note that the same members as in the first embodiment will only be briefly described. In this example, two types of oil and water having different specific gravities are stored in an ice making container, and a water layer and an ice layer are separated by the oil.

As shown in FIG. 2, the ice heat storage device (21) in this example
Ice container (22), heat storage tank (23), connecting pipe (24)
, a water return pipe (25), a refrigeration circuit (26), a low specific gravity oil circulation circuit (27), and a low specific gravity oil return pipe (27).

Each member will be explained below.

The ice-making container (22) is similar to that of the first embodiment, and the upstream end (24) of the communication pipe (24) is provided on its side wall (22a).
a), the downstream end (25b) of the water return pipe (25), the upstream end (27a) of the low specific gravity oil circulation circuit (27), and the downstream end (28b) of the low specific gravity oil return pipe (28) are connected to each other. On the other hand, a downstream end (27b) of a low specific gravity oil circulation circuit (27) is connected to the bottom surface (22b). In addition, these containers (
As can be seen from Fig. 2, the connection positions of 24), (25), (27), and (28) are preset at positions corresponding to the liquid layers of each liquid stored in the ice making container (22). There is. That is, the upstream end (24a) of the communication pipe (24) and the water return pipe (
The downstream end (25b) of 25) is connected to the ice layer, the upstream end (27a) of the low specific gravity oil circulation circuit (27) and the low specific gravity oil return pipe (25).
The downstream ends (28b) of 8) are each connected to a low specific gravity oil layer.

The heat storage tank (23) stores ice generated in the ice making container (22), and its side wall (23a) includes the downstream end (24b) of the communication pipe (24) and the low specific gravity oil return pipe. The upstream end (28a) of (28) is connected, and the bottom surface (
The upstream end (25g) of the water return pipe (25) is connected to 23b).

Further, a cooling load (not shown) is connected to the heat storage tank (23).

The communication pipe (24) connects the ice making container (22) and the heat storage tank (23), and as described above, the upstream end (24a)
) corresponds to the ice layer of the ice making container (22), and the downstream end (24b) is located at the upper part of the side wall of the heat storage tank (3).

The water return pipe (25) guides the water (W) in the heat storage tank (23) to the ice making container (22), and as described above,
The connection position of the downstream end (25b) corresponds to the ice layer of the ice making container (22), and a water circulation pump (Pl) is interposed at the intermediate position.

The low specific gravity oil circulation circuit (27) includes an oil circulation pump (P3),
It consists of a heat exchange part (H) and an on-off valve (V) connected in this order, and the connection point with the ice making container (22) is at the upstream end (27a
) corresponds to the low specific gravity oil layer, while the downstream end (27b
) is the bottom surface (22b) of the ice making container (22).

Further, the connection part with the bottom surface (2221) is a spouting part for the low specific gravity oil (LO) that has circulated in the low specific gravity oil circulation circuit (27), and is equipped with a spouting nozzle (27c). .

Further, the heat exchange section (H) is connected to the evaporator (32) of the refrigeration circuit (26).

As is conventionally known, the refrigeration circuit (26) includes a compressor (29).
), condenser (30), expansion valve (31) and evaporator (3
2) are connected in series by refrigerant piping, and the heat exchange section (
This is to cool low specific gravity oil (LO) flowing through H).

The low specific gravity oil return pipe (28) carries the low specific gravity oil (LO) sent together with the ice (1) from the ice making container (22) into the heat storage tank (23).
) to return it to the ice making container (22) again,
An oil return pump (P4) is provided, and as described above, its upstream end (28a) and downstream end (28b)
Each end is set at a position corresponding to the low specific gravity oil layer of each of the ice making container (22) and the heat storage tank (23). In addition, the heat storage tank (28 m) at the upstream end of the low specific gravity oil return pipe (28)
23), the connection position of which can be moved up and down, and is equipped with a float device (F) equipped with a float adapted to the specific gravity of the low specific gravity oil (LO). That is, the position of the upstream end (28a) of the low specific gravity oil return pipe (28) is always configured to be a position suitable for the low specific gravity oil layer.

Also, the upstream end (27a) tip of the low specific gravity oil circulation circuit (27) and the downstream end (28b) of the low specific gravity oil return pipe (28)
A float device is also installed at the tip.

Next, each liquid stored in the ice making container (22), which is the main part of the present invention, will be explained. The interior of the ice making container (22) consists of four layers, one solid layer and three liquid layers, during ice making, namely, an ice layer, a low specific gravity oil layer, a water layer, and a high specific gravity oil layer. The low specific gravity oil (LO) forming the low specific gravity oil layer is set to have a specific gravity of about 0°9 to 1.0, that is, water (W).
The specific gravity is set between that of ice (I) and ice (I), and specifically, turbine oil mixed with Freon 113 is used, and serves as the heat transfer medium of this device. Similar to the oil used in the first embodiment, the high specific gravity part (HO) constituting the high specific gravity oil layer has a specific gravity of 1 or more, that is, a specific gravity greater than that of water (W), and the water (W) and the ejected Shi nozzle (
27c) The purpose is to prevent the tip from freezing due to contact with the tip and thereby block the nozzle, and to cool the water (W) from the bottom.

In addition, this high specific gravity part (HO) is the jet nozzle (27c)
In order to prevent a decrease in the flow rate necessary for stirring the low specific gravity oil (LO) ejected from the LO, it is desirable that the viscosity is close to that of water.

Next, the ice making operation with the above configuration will be explained.

First, the on-off valve (V) is opened and the oil circulation pump (
P3) to drive the low specific gravity oil (L) in the ice making container (22).
O) is passed through the low specific gravity oil circulation circuit (27), and the refrigeration circuit (2
By evaporating the refrigerant in the evaporator (32) of 6), it is cooled in the heat exchange section (H), and the low specific gravity oil circulation circuit (27) is cooled.
The ice is ejected from the ejection nozzle (27c) into the ice making container (22).

After the low specific gravity oil (LO) passes through the high specific gravity oil layer due to the ejection,
It is sent to the aqueous layer, and the water (W) in the aqueous layer is stirred and
Heat exchange is performed efficiently with W). The water (W) subjected to the heat exchange becomes a supercooled state, and when the supercooled state is eliminated, slurry-like ice is generated. The generated ice (1) has a specific gravity smaller than that of water (W), so it floats to the upper layer in the ice making container (2). In addition, low specific gravity oil (L
Since the specific gravity of O) is set larger than that of Ibaraki (1), the inside of the ice making container (22) has a liquid layer structure as shown in FIG. That is, from the top, the ice layer, low specific gravity oil layer, water layer, and high specific gravity oil layer are formed, and the ice layer and the water layer are separated by the low specific gravity oil layer.

After performing this ice-making operation for a certain period of time, the water circulation pump (Pl) is driven to direct the water in the heat storage tank (23) to the ice layer of the ice-making container (22) via the water return pipe (25). Supply water. Due to the water supply, the ice in the ice making container (22) is sent to the connecting pipe (24) side, and from the connecting pipe (24) to the heat storage tank (
23). Then, when a predetermined amount of ice (1) in the ice making container (22) is fed into the heat storage tank (23),
The water circulation pump (Pl) is stopped and the heat storage work is completed. In this case, since the water layer is separated from the ice layer by the low specific gravity oil layer, the water (W) in the water layer is not fed into the heat storage tank (23) from the connecting pipe (24). Only ice (1) effective for heat storage will be sent to the heat storage tank (23). In addition, when the ice is fed, low specific gravity oil (LO) may be sent into the heat storage tank (23) together with Ibaraki (1). By driving the oil return pump (P4), the oil is returned to the ice making container (22) and is brought into a state where it can act as a refrigerant. In this case, the low specific gravity oil return pipe (28
) is provided with a float device (F) and is always set at a position corresponding to the low specific gravity oil layer, so that recovery of the low specific gravity oil (LO) is ensured.

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

In the invention according to claim (1), the water is cooled by direct contact between the cooled water-insoluble liquid and the water, and at the same time, the cooling is carried out by stirring the ibaraki with a stirring means to generate slurry ice. The operation and stirring operation work together to uniformly cool water and efficiently generate ice in the form of slurry.

On the other hand, in the invention according to claim 21, a water-insoluble liquid is cooled by evaporation of a refrigerant in a heat exchanger of a refrigeration circuit immersed in the water-insoluble liquid, and water is poured into the cooled water-insoluble liquid. In addition to direct contact, air for stirring is supplied from the air supply means to promote heat exchange between the non-aqueous liquid and water, thereby cooling and freezing the Ibaraki, sealing the ice making container and heat storage tank. It does not need to be a container, does not have the conventional problems associated with liquid leakage or air intrusion, and has a simple structure, making maintenance management easy. Unlike conventional static ice making equipment, the cooling pipe does not come into contact with water, so there is no reduction in ice making capacity due to ice adhering to the cooling pipe. Since the ice is prevented from turning into ice blocks due to the stirring operation, it is possible to quickly follow changes in the cooling load during heat dissipation (when the ice melts).

Furthermore, in the invention according to claim (3), in addition to the effects cited in the invention according to claim (2), the low specific gravity non-aqueous liquid is cooled by evaporation of the refrigerant in the refrigeration circuit, and the cooling Water is brought into direct contact with the low specific gravity water-insoluble liquid to cool and freeze the ibaraki, and the produced ice has a low specific gravity and is separated from water by the low specific gravity water-insoluble liquid. Therefore, it is easy to transport to the heat storage tank, water is suppressed from being mixed in, and only ice that is effective for heat storage is supplied, resulting in high heat storage efficiency.

Furthermore, in the invention according to claim (4), the connection part of the water-insoluble liquid return pipe of the heat storage tank is provided with a float device that opens and closes the connection part, so that when ice is fed, the inside of the heat storage tank is The recovery of low specific gravity non-aqueous liquids mixed into the water is guaranteed.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an ice heat storage device according to a first embodiment of the present invention. FIG. 2 is a circuit diagram of an ice heat storage device according to a second embodiment of the present invention. FIG. 3 is a schematic explanatory diagram of a conventional ice heat storage device. (2), (22)...ice container, (3), (23)...
... Heat storage tank, (4), (24) ... Communication pipe (ice supply means), (5), (25) ... Water return pipe (water return means),
(6), (26)... Refrigeration circuit (cooling means), (7)
... Air supply pipe (air supply means), (7b) ... Outlet, (13), (32) ... Evaporator (heat exchanger)
, (27)...Low specific gravity oil circulation circuit (water-insoluble liquid circulation means), (28)...Low specific gravity oil return pipe (layer liquid means),
(O), (LO), (HO)... water-insoluble liquid, (W
)...Water, (1)...Ice, (E)...Stirring air (stirring means), (F)...Float means. F'j 1QJj "21

Claims (4)

[Claims] (1) Ice stored in the heat storage tank (3) as a heat storage medium (
I) is an ice-making method for making ice, in which water (W) for ice making and a water-insoluble liquid (O) are stored in an ice-making container (2), and the water-insoluble liquid (O) is transferred to a cooling means (6). ), the water (W) is cooled by direct contact between the cooled water-insoluble liquid (O) and water (W), and at the same time, the water (W) is stirred by a stirring means (E). Let it become a slurry of ice (
An ice-making method characterized by producing I). (2) Water-insoluble liquid (O) with specific gravity greater than 1 and water (W
), a heat storage tank (3) in which the ice (1) generated in the ice making container (2) is stored, and the ice making container (2) and the heat storage tank. (3) and ice feeding means (4) that connects the ice making container (2) to the ice (I) to the heat storage tank (3), and the water (W) in the heat storage tank (3). A return means (5) for returning water to the ice making container (2), and a means for returning water to the ice making container (2).
) immersed in a water-insoluble liquid (O) in the heat exchanger (13
) for cooling the water-insoluble liquid (O).
6), and an air supply means (7b) having a supply port (7b) opened at the bottom of the ice making container (2) and supplying air (E) for stirring the water.
7) An ice heat storage device consisting of. (3) An ice making container (22) in which two types of water-insoluble liquids (LO), (HO) and water (W) having a specific gravity lower and higher than water are stored in direct contact with each other; ), and the ice making container (22) and the heat storage tank (23) are connected to each other, and the ice (I) in the ice making container (22) is stored in the heat storage tank. (23); water return means (25) for returning water (W) in the heat storage tank (23) to the ice making container (22);
3) Pour the low specific gravity water-insoluble liquid (LO) into the ice making container (2).
liquid return means (28) for returning the liquid to the ice making container (22);
) and a water-insoluble liquid circulation means (27) for circulating the water-insoluble liquid (LO);
27); and a refrigeration circuit (26) equipped with a heat exchanger (32) that is provided in the middle of the water-insoluble liquid (LO) to cool the water-insoluble liquid (LO). (4) In the ice heat storage device according to claim (3), the connection part (28a) of the liquid return means (28) of the heat storage tank (23) has a float device (F) for opening and closing the connection part (28a). An ice heat storage device equipped with