JPH10122606A - Ice heat storage tank in ice heat storage cooling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent operation failure of a cooling water pump from being produced owing to drying-up of a fluid by spraying temperature raised concentrated brine onto an upper surface of an ice layer to make it contact with ice, and providing a bypass passage which opens below an ice layer surface at its upper end and opens below an interface between the ice layer and the concentrated brine layer at its lower end. SOLUTION: A plurality of ice slurry supply nozzles 10 are connected with an ice slurry supply header 9 connected with a line L2 for supplying ice slurry S. A bypass passage 12 is provided on an internal wall surface of an ice heat storage tank 1. The bypass passage 12 is disposed with its upper end located in the vicinity of a surface E of the ice layer 4 and with its lower end 12b opened below an interface C between the ice layer 4 and a concentrated brine 5. A plurality of the bypass passages 12 are disposed vertically along an internal wall of the ice heat storage tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an ice storage tank in an ice storage type cooling / cooling method, and more particularly, an ice maker is operated by using electric power at night to produce an ice slurry. The present invention relates to a structure of an ice heat storage tank in an ice storage type cooling / cooling method in which the heat stored in a heat storage tank is used for cooling in the daytime or the like.

[0002]

2. Description of the Related Art Conventionally, an ice heat storage type in which an ice slurry is manufactured using electric power at night, the ice slurry is stored in an ice heat storage tank, and the cold heat of the ice slurry is taken out during daytime cooling to cool the ice. Cooling and cooling methods are known. That it is supplied to the ice maker 3 with brine pump 2 brine B accommodated in the ice thermal storage tank 1 from the line L ₁ as shown in FIG. 10 to produce ice slurry S, the line L ₂ to the ice slurry S After that, it is introduced into the ice heat storage tank 1. The ice slurry S introduced into the ice heat storage tank 1 separates and floats the ice particles from the brine due to a difference in specific gravity, thereby forming a sherbet-shaped ice layer 4 and a concentrated brine layer 5 below.

During daytime cooling, the cooled concentrated brine B ₁ is sent from a line L ₃ to a heat exchanger 7 by a chilled water pump 6, where water W as a heat medium supplied from a line L _{4 is} supplied. The concentrated brine B ₂ , which has been cooled and raised in temperature, is sprayed from a spray nozzle 8 onto the ice layer 4 in the ice storage tank 1 from a line L ₅ and cooled by contact with ice. The cooled water W in the heat exchanger 7 is transferred from the line L ₆ to the load side, such as a cooling device.

[0004]

However, there is a problem in the structure of the ice heat storage tank in the conventional ice heat storage type cooling / cooling system as described above. That is, since the surface of the ice layer 4 floating in the air in the ice heat storage tank 1 is dehydrated to form a firmly tight ice layer, the sprayed concentrated brine is applied to the ice layer 4.
Since the water stays on the surface and penetrates into the ice layer 4 to be cooled and descends to the lower concentrated brine layer 5, the descending process requires a long time.

Therefore, the amount of the concentrated brine B ₁ forming the concentrated brine layer 5 tends to be reduced, and the concentrated brine B ₁ supplied to the heat exchanger 7 tends to run out. Moreover, the worst that if a case where the amount of concentrated brine B ₁ is often lowers the suction pressure of the cold water pump 6 brine permeation rate through the ice layer 4 becomes a rate-determining also the cold water pump 6 is inoperable Things can happen.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an ice slurry produced by an ice maker is introduced into an ice heat storage tank to form an ice layer on an upper part. Is stored by forming a concentrated brine layer at the bottom, heat exchanges the concentrated brine in the ice heat storage tank with the heat medium on the load side, and brings the heated concentrated brine into contact with ice in the ice heat storage tank to cool. In the ice storage cooling and cooling method, the heated concentrated brine is sprayed on the upper surface of the ice layer so as to come into contact with ice, and further the upper end is opened below the ice layer surface, and the lower end is opened. It is an object of the present invention to provide an ice storage tank in an ice storage type cooling / cooling method provided with a bypass path opened below an interface between the ice layer and the concentrated brine layer.

Further, the ice slurry produced by the ice maker is introduced into an ice heat storage tank to form an ice layer at the upper part and a concentrated brine layer at the lower part to store the ice layer, and the concentrated brine in the ice heat storage tank is loaded. In the ice storage type cooling / cooling method in which heat exchange is performed with the heat medium on the side and the heated concentrated brine is brought into contact with ice in an ice storage tank and cooled, a lower portion has a jet port in the ice layer. An ice storage type cooling / cooling method in which a water path nozzle is disposed, and the heated concentrated brine is injected into the ice layer through the water path nozzle to bring the concentrated brine into contact with the ice. A heat storage tank is provided.

In the ice storage tank in the ice storage type cooling / cooling method configured as described above, the concentrated brine sprayed on the upper surface of the ice layer and heated first is cooled while flowing on the surface of the ice layer. The brine enters the lower concentrated brine layer via a bypass path. In the method of injecting the heated concentrated brine into the ice layer from the water channel nozzle, the heated concentrated brine perforates the ice layer relatively easily and flows down while being cooled. The sprayed concentrated brine flows down the surface of the ice layer, is cooled, passes through the water path perforated by the bypass path and the water path nozzle,
Since the water quickly flows down to the concentrated brine layer in a short time, there is no danger that the operation of the chilled water pump becomes inoperable.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ice storage tank in an ice storage type cooling / cooling method according to the present invention will be described below with reference to FIGS. In these drawings, the same reference numerals as those in FIG. 10 indicate the same names. 1 and 9 in FIG. 2, an ice slurry supply header connected to the supply line L ₂ the ice slurry S, the ice slurry supply header 9
Are connected to a plurality of ice slurry supply nozzles 10. An impingement plate 11 is provided at the lower end of the ice slurry supply nozzle 10 as shown in FIGS. 3 and 4, and the ice in the supplied ice slurry S diffuses in the ice heat storage tank 1 without a short path. Is considered.

[0010] A bypass path 12 is provided on the inner wall surface of the ice heat storage tank 1.
The bypass path 12 is arranged such that the upper end 12a is opened near the surface E of the ice layer 4 and the lower end 12b is opened below the interface C between the ice layer 4 and the concentrated brine layer 5.
Specifically, the distance from the liquid level D of the concentrated brine B ₁ to the upper end 12 a of the bypass path 12 is h ₁ , and the concentrated brine B ₁
When the liquid surface D of the distance to the surface E of the ice layer 4 and h _2, relationship between the two distances, 0 upper end of ≦ h ₂ to be in the range of ≦ h ₁ bypass passage 12 is defined. In this case, even if both distances h ₁ <h ₂ , the ice layer 4 is kept on the bypass route 1
Since the surface 2 ascends while maintaining its cross-sectional shape, the bypass path 12 is not closed.

On the other hand, the distance from the bottom surface 1a of the ice heat storage tank 1 to the lower end 12b of the bypass path 12 is h ₃ ,
When the distance from a to the interface C between the concentrated brine layer 5 and the ice layer 4 is h ₄ , both distances are such that h ₃ ≦ h ₄ and from the bottom surface 1 a to the lower end of the ice slurry supply nozzle 10. when the distance between h _5, by selecting the position of the lower end 12b of the bypass passage 12 so that both distances becomes h ₃ ≦ h _5, without the ice particles to flow into the bypass passage 12, therefore the ice No closure due to

A plurality of such bypass paths 12 are vertically arranged along the inner wall 1b of the ice heat storage tank 1 as shown in FIG. Of course, the number and position of the bypass paths 12 may be appropriately selected depending on the shape of the ice heat storage tank 1 and the like. In the ice storage tank used in the ice storage type cooling / cooling method having the above-described configuration, the concentrated brine B _{2, which} has now been heated in the heat exchanger 7, passes through the line L ₅ and the watering header 13 from the spray nozzle 8 to the ice layer 4. Sprayed on surface E.

At the start of defrosting (at the start of cooling), the sprayed concentrated brine B ₂ contains the ice layer 4.
Is cooled while flowing on the surface E, and a part thereof permeates into the ice layer 4, but the rest is supplied to the concentrated brine tank 5 via the bypass path 12. By this operation, the solidified layer of the surface E of the ice layer 4 gradually melts,
As a result, the lower sherbet-shaped ice layer 4 floats, so that the sprayed concentrated brine B ₂ always flows on the surface of the ice layer 4, is cooled, and flows down into the concentrated brine layer 5.

FIGS. 5 to 9 show an embodiment of the structure of the ice heat storage tank in another type of ice storage type cooling / cooling method in which the concentrated brine B ₂ heated to the ice layer 4 is injected. 1 to 4 and FIG.
The same reference numeral as 0 indicates the same name. In this embodiment, a structure in which the bypass path is omitted can be adopted.

In these figures, the concentrated brine B ₂ heated in the heat exchanger 7 is supplied from a line L ₅ to a sprinkling header 13, and a part thereof is sprayed from a spray nozzle 8 onto the surface E of the ice layer 4. The remaining part is configured to be injected from the water path nozzle 14 into the ice layer 4, specifically, from a relatively upper part of the ice layer 4 mainly from the horizontal direction and downward.

The water path nozzle 14 has a function of injecting the concentrated brine B ₂ into the ice layer 4. As shown in FIG. 7, the lower end 14 a is closed with a blind cover 15, and the concentrated brine B _{2 is} moved in the lateral direction. 8 or a plurality of fountain nozzles 17 in the vertical direction below the water path nozzle 14 as shown in FIG. 8, or as shown in FIG. Various structures such as forming the tapered portion 14b at the lower end and providing a large number of fountain nozzles 17 on the tapered portion 14b are employed.

[0017] and preferably ice-start at (cooling start) is by opening the valve 19 while squeezing the valve 18, reducing the amount to be sprayed concentrated brine B ₂ from the spray nozzle 8, whereas, water conducting nozzle Control is performed so as to increase the amount injected from 13 into the ice layer 4. When the ice layer 4 is pierced, the valve 19 is closed, while the valve 18 is fully opened, and the concentrated brine B ₂ is sprayed from the spray nozzle 8 onto the surface E of the ice layer 4.

Of course, the injection method for injecting the concentrated brine B ₂ into the ice layer 4 and the above-mentioned bypass method have the same effect as each other, but both methods can be combined.

[0019]

As is apparent from the above description, according to the ice heat storage type cooling and cooling method of the present invention, the bypass path is provided so as to penetrate the ice layer.
Especially during thawing starts, concentrated brine B ₂ was raised is cooled in contact with the surface of the ice layer, it is possible to flow into concentrated brine layer through the bypass passage, and flows down to the concentrated brine layer in a short time In addition, it is possible to prevent the operation of the chilled water pump from being disabled due to running out of liquid or the like.

Further, a water path nozzle is provided so as to jet brine into the ice layer, and at the start of de-icing, brine is actively supplied into the ice layer from the water path nozzle, whereby brine is introduced into the ice layer. Drain the passing water path and spray the concentrated brine, which is sprayed from the spray nozzle onto the ice layer surface and flows over the ice layer surface, and is cooled down through the water path into the concentrated brine layer, while melting the ice layer. The brine can be cooled.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an ice storage tank in an ice storage type cooling / cooling system according to the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a side view showing a lower structure of the ice slurry supply nozzle.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side sectional view of an ice storage tank in another type of ice storage type cooling / cooling method according to the present invention.

FIG. 6 is a plan sectional view of FIG. 5;

FIG. 7 is a side view showing the tip of the water path nozzle.

FIG. 8 is a side view showing the tip of another structure of the water path nozzle.

FIG. 9 is a side view showing a tip portion of still another structure of the water path nozzle.

FIG. 10 is a side sectional view of an ice heat storage tank in a conventional ice storage type cooling / cooling method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ice heat storage tank 2 Brine pump 3 Ice maker 4 Ice layer 5 Concentrated brine layer 6 Cold water pump 7 Heat exchanger 8 Spray nozzle 9 Ice slurry supply header 10 Ice slurry supply nozzle 11 Impact plate 12 Bypass path 13 Watering header 14 Water path nozzle 15 Blind lid 16 Spout port 17 Spout head 18, 19 Valve

Claims (4)

[Claims] 1. An ice slurry produced in a brine by an ice maker is introduced into an ice heat storage tank to form an ice layer at an upper portion and a concentrated brine layer at a lower portion to be stored therein. An ice storage type cooling system in which the brine is heat-exchanged with a heat medium on the load side, and the heated concentrated brine is brought into contact with ice in an ice storage tank to be cooled, and the cooling method includes the steps of: By spraying on the upper surface of the ice layer so as to make contact with the ice, further provided is a bypass path having an upper end opening near the ice layer surface and a lower end opening below an interface between the ice layer and the concentrated brine layer. Ice storage tank in the ice storage type cooling / cooling method. 2. The ice heat storage tank according to claim 1, wherein a bypass path is provided along the inner wall. 3. An ice slurry produced in a brine by an ice maker is introduced into an ice heat storage tank to form and store an ice layer at an upper part and a concentrated brine layer at a lower part. In the ice storage type cooling / cooling method in which the brine is heat-exchanged with the heat medium on the load side, and the heated concentrated brine is brought into contact with ice in the ice storage tank to cool the ice, the lower part is injected into the ice layer. An ice storage type cooling / cooling system in which a water path nozzle having an outlet is arranged, and the heated concentrated brine is ejected into the ice layer through the water path nozzle to bring the concentrated brine into contact with the ice. Ice storage tank in the method. 4. The water path nozzle according to claim 3, wherein a plurality of ejection ports for ejecting the concentrated brine in a plurality of directions are provided.