JPH06185764A - Deicing tank in cooling system - Google Patents

Abstract

PURPOSE:To perform a good deicing in a deicing tank in which ice water fed from a cold heat supplying source is mixed with returned water returned from a heat exchanger. CONSTITUTION:There is provided a deicing tank 21 in which ice water fed from a cold heat supplying source 1 is mixed with returned water returned from a heat exchanger 5. Multi-stage horizontal partition plates 25 are installed within the deicing tank 21. Each of the horizontal partition plates 25 is provided with openings which are staggered to each other at each of the stages so as to move the ice upwardly while the ice is stayed in water for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system utilizing latent heat of ice, and in particular, before sending ice water sent thereto to a heat exchanger or an air conditioner (hereinafter collectively referred to as heat exchanger). The present invention relates to a thaw tank that thaws ice in this ice water.

[0002]

2. Description of the Related Art In a system for heating and cooling a region, cold water used for cooling is often supplied by cold water. In this case, the amount of heat supplied is only due to sensible heat change. For example, the temperature of the cold water to be sent is 5 ° C., and the temperature of the reflux water used in the heat exchanger that has been refluxed is 15 ° C. at most, so that the amount of heat supplied is limited to about 10 Kcal for 1 kg of water. . Therefore, in order to supply the required cold heat, a large amount of cold water must be sent, and the power for sending the cold water becomes large.

On the other hand, there is a system of supplying cold heat with ice water which is a mixed state of ice and water. In this case, for example, if 0.2 kg of ice and 0.8 kg of water are mixed and sent, and the temperature of the reflux water is 12 ° C., the amount of heat taken from the surroundings when 1 kg of ice is thawed is 80 Kcal. , 0.2 × 80 + (12-0) = 28Kcal / kg of cold heat can be sent. This makes it possible to supply a large amount of cold heat with a small amount of ice water.

In order to reduce the diameter of the pipe, the ice filling rate (IPF) of the ice water may be increased. Such a technique is described in JP-A 1-285727.

However, when sending ice water having a large ice filling factor (IPF), the ice inside does not melt even when it reaches the end heat exchanger. Therefore, when designing the heat exchanger, it is necessary to consider ensuring the flow passage cross-sectional area necessary for ice to pass and the tank internal volume to have a residence time necessary for deicing. There is a drawback that the efficiency of heat exchange in the heat exchanger is lower than that in the heat exchanger in which only ice flows.

In order to solve this drawback, for example, Japanese Patent Laid-Open No.
There is a technique, such as the technique described in -263441, in which reflux water from a heat exchanger is sprinkled over ice water to perform deicing. That is, as shown in FIG. 2, the ice water sent from the ice heat storage tank 1 is once put in the thaw tank 3. Then, the reflux water from the heat exchanger 5 is sprinkled on the ice water in the thaw tank 3. This water spray breaks the ice in the ice water. Then, only cold water is taken out from the thaw tank 3 and sent to the heat exchanger 5.

[0007]

However, in the above-described conventional thaw tank 3, the sprinkled water only comes into immediate contact with the ice floating above the thaw tank 3, so that the thaw is sufficiently performed. There was a problem of not being able to.

The present invention has been made to solve the above problems, and is a solution in a cooling system in which ice water from a cold heat source can be sufficiently thawed by reflux water from a heat exchanger. The purpose is to provide an ice bath.

[0009]

In order to achieve the above-mentioned object, the present invention provides an ice water from a heat exchanger or an air conditioner, which is supplied from a cold heat source in a mixed state of ice and water. In the thaw tank that is melted by the refluxed reflux water, a partition plate provided in multiple stages inside the thaw tank, an opening opened in each partition plate and having staggered positions at each step, and at one end of the thaw tank It is an ice-melting tank of a cooling system, which is provided with an ice-water introducing unit provided and a cold-water extracting unit provided at the other end of the ice-melting tank.

[0010]

The ice of the ice water introduced from the ice water introducing portion of the thaw tank is blocked by the horizontal partition plate of each stage, follows the long path, and moves upward without stagnation. Therefore, it can be brought into contact with water (reflux water) in a fluidized state, that is, in a stirred state, and the deicing is sufficiently performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The cold heat supply source in this embodiment is the ice heat storage tank 1. The ice heat storage tank 1 is supplied with ice from the ice maker 7, stores the ice together with water, and sends ice water in a mixed state of ice and water toward the heat exchanger 5 at the end.

The terminal heat exchanger 5 is present, for example, for each building 9 in the area. An ice separator 11 is provided upstream of the heat exchanger 5 in this building 9. The ice separator 11 divides the sent ice water 13 into ice water 15 and cold water 17. This divided ice water 15
Is more packed with ice than the sent ice water 13 (IP
F) is getting bigger. The separated ice water 15 is mixed with a part of the reflux water 19 from the heat exchanger 5. As a result, the ice contained in the ice water 15 is thawed.

This thawing is carried out in the thawing tank 21 in order to carry out the thawing more efficiently. That is, the mixed reflux water 19 and ice water 15 are introduced into the inside from the ice water introducing portion 23 provided in the lower portion of the thaw tank 21. Horizontal partition plates 25 are provided in multiple stages inside. An opening 27 is opened in each horizontal partition plate 25, and each opening 27 has a staggered position in each step.

The size of the opening 41 can be made smaller as the opening 41 in the upper tier conforms to the size of ice that becomes smaller as it goes upward. Further, the vertical spacing between the horizontal partition plates 25 can also be gradually reduced in accordance with the changing size of ice. An ice water take-out section 29 is provided on the upper portion of the thaw tank 21.

Cold water 31 taken out from the ice water take-out section 29
Joins the cold water 17 separated by the ice separator 11. After merging, it is sent to the heat exchanger 5.

In the heat exchanger 5, heat exchange is performed between cold water and air in the room to be cooled. As a result, the air is cooled, the cold water is warmed, and is returned to the ice heat storage tank 1 as the return water 19.

The operation of this embodiment will be described below.
For example, the ice machine 7 makes ice by using electric power at night and stores it in the ice heat storage tank 1. The ice heat storage tank 1 sends ice water 13 which is a mixed state of ice and water to each building 9 through a pipe 33 in accordance with, for example, a demand for cooling in the daytime. Ice separator 1 in each building 9
After being divided into ice water 15 having a higher IPF and cold water 17 by 1, the ice water 15 is mixed with a part of the reflux water 19 to be thawed in the thaw tank 21. The cold water 31 exiting the thaw tank 21 and the cold water 17 from the ice separator 11 join together and are sent to the heat exchanger 5 to be used for cooling the inside of the building 9. After that, the cold water is warmed to become the reflux water 19 and returns to the ice heat storage tank 1.

According to the above embodiment, the IPF of the ice water sent from the ice heat storage tank 1 is large, and therefore, even if the ice remains inside when it is sent to the building 9, it is sent to the heat exchanger 5. It is not ice water, but cold water that does not contain ice. Therefore, even a conventional multi-tube type or play type heat exchanger can sufficiently improve the efficiency of heat exchange without causing ice clogging.

Then, as described above, the IPF of the ice water 13 sent to each building 9 from the ice heat storage tank 1 which is the source of cold heat.
Since it is possible to increase the temperature, it is possible to send a small amount of ice water compared to the case of supplying cold heat to the building only with cold water. This can reduce the power for sending. Furthermore, since it requires a small amount, piping 33 from the ice heat storage tank 1 to the building 9
The diameter of can be reduced.

Further, before the thawing is performed in the thawing tank 21, the ice separator 11 separates the ice water 15 having a high IPF and the chilled water 17, so that the amount of the reflux water 19 necessary for the thawing can be reduced. Therefore, the temperature of the cold water 31 discharged from the defrosting tank 21 can be maintained at a sufficiently low temperature, and the cold water produced by the merging of the cold water 31 and the cold water 17 discharged from the ice separator 11 should also have a low temperature. You can

In particular, due to the action of the horizontal partition plate 25 provided inside the thaw tank 21, the ice water passes through the openings 27 formed in each horizontal partition plate 25 to reach the horizontal partition plate 25 in the upper stage. By moving, the relative velocity at the contact surface between ice and water is increased due to the difference in specific gravity between ice and water and the difference between solid and liquid, which increases the speed of deicing Since the residence time in the thaw tank can be reduced, the thaw tank volume can be reduced. In this way, since the ice water in the thaw tank 21 moves upward while taking a sufficient flow velocity aiming at increasing the thaw speed, a sufficient amount of reflux water 19 is sufficient for the thaw operation. Therefore, the cold water 31 having a low temperature is sent from the thaw tank 21 to the heat exchanger 5, so that the heat exchange rate can be further improved.

In this embodiment, the lower part of the partition plate is
It does not necessarily have to be horizontal, but may be vertical or diagonal.

[0024]

As described above, according to the thaw tank of the cooling system of the present invention, the ice water introduced into the thaw tank is blocked by the partition plates provided in multiple stages to thaw the ice. The water moves at a flow velocity sufficient to increase the velocity, and water (reflux water) can constantly contact with ice and water in a state having a relative velocity, that is, in a stirring state, and the ice is sufficiently thawed. Be done. As a result, a sufficient amount of reflux water can be used to sufficiently thaw the temperature of the cold water sent from the thaw tank to the heat exchanger, and the heat exchange efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic waterway diagram showing an embodiment of the present invention.

FIG. 2 is a schematic waterway diagram showing a conventional example.

[Explanation of symbols]

 1 Ice Storage Tank 3 Heat Exchanger 7 Ice Maker 9 Building 11 Ice Separator 21 Thawing Tank 25 Horizontal Partition Plate

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Front page continued (72) Inventor Mitsuru Kobayashi 4-33 Kitahama Higashi, Chuo-ku, Osaka City, Osaka Prefecture Obayashi Honsha Co., Ltd. Inside the Obayashi Main Store (72) Inventor Yoshio Gomachi 4-33 Kitahama Higashi, Chuo-ku, Osaka City, Osaka Prefecture Obayashi Main Store

Claims (1)

[Claims] 1. In an thaw tank in which ice water sent from a cold heat source in a mixed state of ice and water is melted by reflux water refluxed from a heat exchanger or an air conditioner, inside the thaw tank. Partition plates provided in multiple stages, openings that are opened in each partition plate and have alternating positions at each stage, an ice water introducing part provided at one end of the thaw tank, and an other end of the thaw tank A cooling system defrosting tank equipped with a cold water extraction unit.