JP3064132B2 - Supercooled ice thermal storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage system utilizing supercooling.

[0002]

2. Description of the Related Art FIG. 2 is a system diagram of an air-conditioning ice heat storage system utilizing supercooling. Compressor 1, condenser 2, expansion valve 3
In the refrigeration cycle constituted by the evaporator 4 and the evaporator 4, the evaporator 4 having the heat transfer tube 5 is used as it is as a supercooler. Therefore, in this specification, the evaporator 4
Is also referred to as a “supercooler”. Cold water is supplied to the subcooler 4 from the ice heat storage tank 6 via the ice collecting filter 7, the ice making pump 8, and the valve 9. This cold water is supercooled by the supercooler 4 and becomes water at 0 ° C. or lower. This supercooled water collides with the collision plate 11 of the supercooling release device via the valve 10, the supercooling is released, ice is generated, and the supercooled water falls by gravity into the ice heat storage tank 6. In addition, this seed ice is generally called dynamic ice. The circuit having the operation described above is the ice making chilled water circuit A.
It is.

Next, during the production of cooling water for cooling, the valves 9 and 10 are closed and the valves 12 and 13 are opened. At this time, the chilled water flowing into the evaporator 4 from the cooling pump 14 via the valve 12 is cooled and then sent to the cooling load 15 via the valve 13.

FIG. 2 shows a valve opening / closing state at the time of producing supercooled water, and a dotted arrow shows a flow direction of chilled water at the time of producing chilled water for cooling. The circuit having the operation described above is the cooling water circuit for cooling.

[0005]

In a conventional supercooler, a heat transfer tube is usually formed in one pass in order to prevent icing in a vessel due to a disturbance of a flow when producing supercooled water for ice making. On the other hand, the cooling water for cooling has a larger difference between the inlet and outlet temperatures than the supercooled water, and therefore has a smaller flow rate. For this reason, in the past, the flow rate of the cooling water for cooling in the heat transfer tube became slow, and the heat transfer performance deteriorated.
The ratio between the freezing amount and the work equivalent, that is, the coefficient of performance COP, has decreased, and the efficiency of the refrigerator has been reduced.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, improve the heat transfer performance of the subcooler, and increase the system efficiency during the cooling operation. In addition, it is intended to prevent icing in the valve on the supercooled water outlet side.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and comprises a refrigeration cycle comprising a compressor, a condenser, an expansion mechanism, and an evaporator functioning as a subcooler. Supplying cold water from the heat storage tank to the cooler and cooling it to the supercooled state, then releasing the supercooled state outside the subcooler to generate ice, The present invention relates to a supercooled ice heat storage system capable of switching to a cooling water production operation for cooling and supplying cooling water circulated through a cooling load, and to a supercooled ice heat storage system having the following features. . (1) The supercooler is connected to a first water chamber on both sides and a second
A shell-and-tube type supercooler comprising a water chamber and a heat transfer tube provided between the water chamber and a first water chamber and a second water chamber;
Each chamber is divided into two by a partition plate.
When producing supercooled water for ice making, the cold water from the heat storage tank flows from the first water chamber to the second water chamber in one pass, and when producing the cooling water for cooling, the cold water is supplied to one of the divided waters of the second water chamber. From the room
After sending the water to one of the divided water chambers of the first water chamber,
One of the divided water chambers of the first water chamber to the first water chamber
Send to the other split water chamber, split the first water chamber
The other water chamber divided from the second water chamber from the other water chamber
To a to flow in two passes, it was constructed by connecting the cold water pipe. (2) In the supercooled ice heat storage system according to the above mode (1), a switching valve for switching the operation is provided in the chilled water pipe. (3) In the supercooled ice heat storage system according to the above mode (2), the valve on the outlet side of the supercooled water among the switching valves is a full bore ball valve.

[0008]

[Action]

(1) During the production of supercooled water for ice making, the cold water flows in parallel from the two inlet water chambers to the two outlet water chambers of the subcooler to form one pass. In addition, during the production of cooling water for cooling, the cold water flows in a U-shape in the evaporator (corresponding to the above-described subcooler) heat transfer tube,
Form two passes. (2) The above two types of operation are switched by the switching valve. (3) When the flow of the supercooled water is disturbed, the supercooled water freezes and becomes a flow resistance at the icing position. Ice formation is prevented by applying a full-bore ball valve to the supercooled water outlet valve where disturbance is most likely to occur.

[0009]

1 is a system diagram of a supercooled ice heat storage system according to one embodiment of the present invention. In the figure, compressor 1, condensation
, Expansion valve 3 and evaporator 4 functioning as a subcooler
Is shown. Undercooling
The inlet water chamber (first water chamber) of the recirculator 4 is filled with water by the partition plate 16.
Chamber 17A and a water chamber 17B.
The outlet water chamber (second water chamber) is separated by a partition plate 18 into a water chamber 19.
A, the water chamber 19B is divided into two. Water chamber of subcooler 4
17A and 17B, the ice collecting filter from the ice storage tank 6 is used.
7 and the valve 9 of the ice making chilled water circuit A through the ice making pump 8
These pipes are in communication with each of the two halves. Water room 1
7A communicates with the water chamber 19A, and the water chamber 17B communicates with the water chamber 19B. And the water chamber 19A is a full bore ball
The water chamber 19B is connected to the valve 20A and the valve 12 of the cooling water circuit B for cooling.
For the full bore ball valve 20B and the valve 13 of the cooling water circuit B for cooling
Communicating. The full-bore ball valves 20A and 20B are a pair of valves used as outlet valves for supercooled water. This valve is a rotary valve that forms a cylindrical passage when fully opened, and does not disturb the flow and therefore has very little resistance. On the other hand, cooling load 15 and cooling pump 14
The cooling water circuit B for cooling constituted by
12 is connected.

FIG. 1 shows the valve state during the production of supercooled water, and the dotted arrows show the flow direction of the chilled water during the production of chilled water for cooling.
You.

In the present apparatus, when producing supercooled water for ice making, the cold water from the ice heat storage tank 6 is passed through the ice making cold water circuit A.
It is supplied to the subcooler 4. After passing through valve 9, the cold water
Toki to the subcooler 4 inlet side of the divided water chamber 17A, 1
Divided water chambers 19A, 19 on the outlet side from both water chambers of 7B
It flows in parallel to both water chambers of B and forms one pass in the subcooler 4 . This cold water is supercooled to 0 ° or less by subcooler 4.
And becomes supercooled water, and full bore ball valves 20A and 20B
Collides with the collision plate 11 of the supercool release device through
The ice is released and ice is generated, and falls by gravity into the ice heat storage tank 6.
When producing cold water for cooling, full bore ball valves 20A, 20A
B and valve 9 are closed, and valves 12, 13 are opened.
As shown in FIG. 1, the chilled water exiting the cooling pump 14
Is supplied to the subcooler 4 via the cooling water circuit B for cooling.
After the cold water passes through the valve 12, the water chamber 19A, the heat transfer pipe 5, the water
Passing through the chamber 17A as the first pass, from the water chamber 17A to the water chamber 1
Around the pipeline communicating with both 7B, it enters the water chamber 17B
As a second pass, from the water chamber 17B to the heat transfer tube 5, the water chamber 19
Following the order of B, it flows in a U-shape in the evaporator (the supercooler ) 4 to form two passes. Cooled by this evaporator 4
The chilled water passes through a cooling load 15 via a valve 13 and is cooled.
Return to step 14. In addition, from the water chamber 17A to the water chamber 17B.
Communication may be appropriate.

When turbulence occurs, the supercooled water freezes and becomes a flow resistance at the icing position. By passing the full-bore ball valve to the supercooled water outlet valve where the turbulence is most likely to occur, icing is prevented.

In this embodiment, the following effects can be obtained. (1) The flow area of the cold water at the time of manufacturing the cold water for cooling is halved. Therefore, the flow velocity in the heat transfer tube does not decrease, and the heat transfer area does not change, so that the heat transfer performance is improved and the efficiency during the cooling operation is improved. (2) Switching is enabled by providing the switching valve. (3) The use of the full bore ball valve prevents icing in the supercooled water outlet valve during the production of supercooled water for ice making, and improves the reliability of the plant.

[0014]

In the supercooled ice heat storage system according to the present invention, the supercooler is connected to the first water chamber on both sides and the second water chamber.
A shell-and-tube type supercooler comprising a water chamber and a heat transfer tube provided between the water chamber and a first water chamber and a second water chamber;
Each chamber is divided into two by a partition plate.
When producing supercooled water for ice making, the cold water from the heat storage tank flows from the first water chamber to the second water chamber in one pass, and when producing the cooling water for cooling, the cold water is supplied to one of the divided waters of the second water chamber. From the room
After sending the water to one of the divided water chambers of the first water chamber,
One of the divided water chambers of the first water chamber to the first water chamber
Send to the other split water chamber, split the first water chamber
The other water chamber divided from the second water chamber from the other water chamber
The cooling water pipe is connected so that the water flows in two passes, or a switching valve for switching the above operation is provided in the same cooling water pipe, so that the heat transfer performance of the subcooler is improved, Efficiency can be improved.

Further, since the valve on the outlet side of the supercooled water among the switching valves is a full-bore ball valve, icing is prevented from occurring in the supercooled water outlet valve when producing the supercooled water for ice making.

[Brief description of the drawings]

FIG. 1 is a system diagram of a supercooled ice heat storage system according to one embodiment of the present invention.

FIG. 2 is a system diagram of a conventional supercooled ice heat storage system.

[Explanation of symbols]

 Reference Signs List A cold water circuit for ice making B cold water circuit for cooling 1 compressor 2 condenser 3 expansion valve 4 evaporator 5 heat transfer tube 6 ice heat storage tank 7 ice collecting filter 8 ice making pump 9 valve 10 valve 11 collision plate 12 valve 13 valve 14 Cooling pump 15 Cooling load 16 Partition plate 17A, 17B Water chamber 18 Partition plate 19A, 19B Water chamber 20A, 20B Full bore ball valve

Claims (3)

(57) [Claims] 1. Compressor (1) , condenser (2) , expansion mechanism
(3) A refrigeration cycle is constituted by the evaporator (4) functioning as a supercooler, and the supercooler (4) has a heat storage tank.
Supplying the cold water from (6) to cool to a supercooled state, and then canceling the supercooled state outside the supercooler (4) to produce ice for producing ice-cooled supercooled water; In the subcooling type ice heat storage system, which is capable of switching to the operation of producing cooling water for cooling, which supplies cooling water circulated through the cooling load (15) to (4) , the supercooler (4) A shell-and-tube type supercooler composed of a first water chamber and a second water chamber on both sides, and a heat transfer tube (5) provided therebetween, and the first water chamber and the second water chamber are formed. Each partition plate
In the subcooler (4) , cold water from the heat storage tank (6) is supplied to the subcooler (4 ) from the first water chamber to the second water chamber at the time of producing supercooled water for ice making. The cooling water is supplied in a pass, and when producing the cooling water for cooling, the cold water is supplied to one of the divided two water chambers.
One of the divided first water chambers from the water chamber (19A)
After being sent to the water chamber (17A), the first water chamber was split
One of the water chambers (17A) and the other of the first water chamber
To the other water chamber (17B).
The second water chamber was divided from the other water chamber (17B).
A supercooled ice heat storage system, wherein a cold water pipe is connected so as to flow to the other water chamber (19B) in two passes. 2. The supercooled ice heat storage system according to claim 1, wherein a switching valve for switching the operation is provided in the chilled water pipe. 3. The supercooled ice heat storage system according to claim 2, wherein a valve on the outlet side of the supercooled water among the switching valves is a full bore ball valve.