JPH042871B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to an ice heat storage system, and more specifically, brine is circulated between a refrigerator and an ice heat storage tank to cool the water in the ice heat storage tank. This relates to an ice heat storage system in which a portion of ice is frozen to cool the ice, and the cooled water in the ice heat storage tank is circulated to the cooling load.

≪Conventional technology≫ Regarding the use of cooling and cold water supply for houses, buildings, etc.
There are thermal storage cooling systems that use water thermal storage or ice thermal storage. This system consists of a refrigerator and a cold water heat storage tank or an ice heat storage tank.In order to adjust the time lag between heat generation and heat demand, this system uses electricity at night to store cold water or ice, and uses this cold heat storage during the day. The system saves energy by extracting the water and using it for cooling and supplying cold water when necessary. When comparing the water heat storage method and the ice heat storage method, the ice heat storage method has the advantage of being able to significantly reduce the cold heat storage capacity than the water heat storage method, and this ice heat storage method is being widely adopted. It's reached.

This ice heat storage method is roughly divided into two types: solid ice method and liquid ice method. The liquid ice method involves bringing refrigerant and cold water into direct or near-contact contact to create sleet-like ice (slurry), which is then stored in a heat storage tank, but a system for practical use has not yet been completed. In contrast, the solid ice system that is currently commonly used passes refrigerant or brine through the coil holes provided inside the ice storage tank, generates ice on the outer surface of the coil, and supplies the resulting cold heat to the cooling load. It performs cooling.

≪Problems to be solved by the invention≫ However, in the conventional solid ice ice storage system, as ice forms on the outer surface of the coil, the cold heat of the brine inside the coil is conducted to the water in the ice storage tank. This has the disadvantage that the freezing ability decreases and the coefficient of performance of the refrigerator gradually decreases. Furthermore, because of the structure in which a coil is provided inside the heat storage tank, there is a drawback that the water filling ratio (ice volume/water volume) cannot be increased, and therefore, the equipment cost is relatively high.

The present invention was made in view of the problems of the conventional solid ice system as described above.The purpose of the present invention is to improve the freezing ability by effectively transmitting the cold heat of the brine to the water in the ice storage tank, and to improve the freezing ability of the ice storage tank. The object of the present invention is to provide an ice heat storage system that can increase the heat exchange rate and has a low equipment cost.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention circulates brine between the refrigerator and the ice heat storage tank to partially freeze and cool the water in the ice heat storage tank. In an ice heat storage system in which cooled water in an ice heat storage tank is circulated to the cooling load, the ice heat storage tank is deformable in the vertical direction and has concave and convex portions successively formed in an alternating manner below the ice heat storage tank. A heat transfer plate is disposed over the space, and the area above the plate is used as an ice storage chamber, and the area below the plate is partitioned off as a brine circulation chamber, and a circulation path for returning brine to the refrigerator is formed through this brine circulation chamber. Then, a pressurizing pump and an on-off valve are provided in the circulation path, and the on-off valve is closed when necessary to increase the pressure in the brine circulation chamber, thereby bending the plate upward, and inserting the plate into the concave portion of the plate. The frozen ice is detached from the plate and floated to the surface, thereby accumulating ice in the upper part of the ice storage tank.

<<Operation>> When the refrigerator is operated and the brine is circulated through the brine circulation chamber below the ice storage tank, the cold heat of the brine is conducted to the water directly above the heat transfer plate, and the water in the recesses of the plate is frozen, causing the water in the recesses to freeze. Ice is formed inside. In this state, when the on-off valve in the brine circulation path is closed and the brine is forced into the brine circulation chamber by the pressurizing pump, the plate bends upward and the ice in the recess is released from the recess, causing the difference in specific gravity to occur. Therefore, it floats to the upper part of the ice heat storage tank and is accumulated there. After that, when the on-off valve is opened, brine flows through the brine circulation chamber again, the plate returns to its normal state, and when ice is generated in the recesses of this plate again, the above operation is repeated and ice is accumulated one after another. .

<<Example>> Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an ice storage cooling system using an ice storage system according to a first embodiment of the present invention. In this system, a refrigerator 1 and a brine circulation chamber 3 formed below an ice storage tank 2 Brine circulation path 4 that circulates brine, which is a refrigerating power transmission medium, between
is formed, and the brine in this circulation path 4 is forcibly circulated between the refrigerator 1 and the brine circulation chamber 3 by a pressure pump 5. On the other hand, an ice storage chamber 6 in which ice and cold water are stored is formed in the upper part of the ice heat storage tank 2, and this cold water is supplied to a cooling load 9 by a pump 8 via a cold water circulation path 7 to cool the room. Used for cold drinking water, etc.

In the present invention, in the ice heat storage tank 2, a vertically deformable thin heat transfer plate 10 that partitions the brine circulation chamber 3 and the ice storage chamber 6 is provided in the lower part of the ice heat storage tank 2 over the entire surface in the horizontal direction. The brine circulation chamber 3 and the ice storage chamber 6 are partitioned off in a liquid-tight manner. As shown in FIG. 2, this plate material 10 has a folded plate structure in which concave and convex portions are formed in succession alternately, and both sides of each concave and convex portion are formed in a tapered shape.
Further, a heat insulating material 11 is fixed to the upper surface of the convex portion to prevent freezing in this portion.

Further, a tension spring 12 is interposed between the lower surface of this plate material 10 and the bottom surface of the brine circulation chamber 3, and when the plate material 10 is bent upward, as will be described later, it returns to the downward horizontal state. It acts to cause

Further, a solenoid valve 13 is provided in the brine circulation path 4 on the outlet side of the brine circulation chamber 3, and the pressure pump 5 is provided on the inlet side of the brine circulation chamber 3.

Next, we will discuss the operation of the above system.
During ice making, the solenoid valve 13 is in an open state, and the brine cooled to a predetermined temperature by the refrigerator 1 is sent to the brine circulation chamber 3 by the pressure pump 5, from where it passes through the solenoid valve 13. It is returned to the refrigerator 1. This circulation of brine conducts cold heat upward through the plate material 10, and the cold water contained in the recesses 14 of the plate material 10 is frozen. When the electromagnetic valve 13 is closed when the ice has grown to the upper part of the recess 14, the pressure within the brine circulation chamber 3 increases, thereby causing the plate material 10 to curve upward in an arc shape. Due to this curvature, the third
As shown in the figure, the inner wall of the recess 14 of the plate material 10 expands, and when the ice block 15 frozen in the recess separates from the recess 14, new cold water enters the recess 14 above. The ice block 15 floats above the ice storage chamber 6 and is accumulated due to the difference in specific gravity. In this way, the ice block 15 is transferred to the plate material 10.
When the solenoid valve 13 is opened again after the separation from the brine circulation chamber 3 and the pressure in the brine circulation chamber 3 decreases, the tension spring 12 causes the plate member 10 to assume the approximately horizontal state shown in FIGS. 1 and 2. occupy,
The cold water in the recess 14 starts freezing again.

By repeating the above operations, ice blocks are accumulated one after another in the ice storage chamber 6, and this ice accumulation is mainly performed using nighttime electricity.

On the other hand, when cooling is required, the pump 8 of the cold water circulation path 7 may be operated to circulate the cold water in the ice storage chamber 6 to the cooling load 9.

FIG. 4 shows an ice heat storage system according to a second embodiment of the present invention, and to explain the differences between this embodiment and the first embodiment, in this embodiment, the refrigerator 1
A brine heat storage tank 16 is provided between the ice heat storage tank 2 and the ice heat storage tank 2.

The refrigerator 1 and the brine heat storage tank 16 are communicated through a primary brine circulation path 4a,
In between, a primary pump 17 is provided to forcefully circulate brine. In addition, brine heat storage tank 1
6 and the brine circulation chamber 3 of the ice heat storage tank 6 are communicated by a secondary brine circulation path 4b, and a secondary pump 5a is provided in the brine circulation path from the brine heat storage tank 16 to the brine circulation chamber 3. and a check valve 18 are provided. The other configurations are substantially the same as in the first embodiment.

In this second embodiment, the primary pump 17 and the secondary pump 5a are driven during ice making at night,
As in the first embodiment, ice blocks are sequentially generated and stored in the ice heat storage tank 2, while low-temperature brine is stored in the brine heat storage tank 16. If the daytime cooling load is extremely large and lasts for a long time, the system of the first embodiment may not be able to cope with this cooling load, but in the second embodiment, pre-cooled brine is stored in the brine heat storage tank 16. This brine is used to generate ice in the ice storage tank 2 and is sequentially cooled by a refrigerator, so that it can cope with a large cooling load over a long period of time. Conversely, for the same cooling load, the capacity of the refrigerator 1 in the second embodiment can be made smaller than that in the first embodiment.

<<Effects>> As described above, in the ice heat storage system according to the present invention, ice blocks 15 are sequentially generated in the recesses of the deformable heat transfer plate 10 provided below the ice heat storage tank, and the ice blocks 15 are transferred to the brine circulation. When the pressure in the chamber is increased and the plate 10 is bent upward, it separates from this recess and floats above the ice storage tank, so that the ice cubes gradually separate from the ice-making recess of the plate, so that the ice-freezing ability is extremely good and the ice formation is very good. Since the ice blocks float upward and accumulate, the ice filling rate is extremely high, and the equipment cost is low compared to the ice making capacity.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the ice heat storage system according to the first embodiment of the present invention, FIG. 2 is a partial sectional view showing the ice making section in the ice heat storage tank of the first embodiment, and FIG.
The figure is a partial cross-sectional view showing the state in which the ice cubes made as shown in Figure 2 are separated, and Figure 4 is a partial cross-sectional view showing the state in which the ice cubes made as shown in Figure 2 are separated.
It is a diaphragm showing an ice heat storage system according to an example. 1... Refrigerator, 2... Ice heat storage tank, 3... Brine circulation chamber, 4... Brine circulation path, 9... Cooling load, 10... Deformable heat transfer plate, 13...
Opening/closing valve, 14... recess, 15... ice block.

Claims (1)

[Claims] 1 Circulating brine between the refrigerator and the ice heat storage tank to partially freeze and cool the water in the ice heat storage tank,
In an ice heat storage system configured to circulate the cooled water in the ice heat storage tank to the cooling load, the ice heat storage tank is deformable in the vertical direction and has uneven portions formed in a continuous and alternating manner below the ice heat storage tank. A heat transfer plate is provided across the plate, and the upper part of the plate is used as an ice storage chamber, and the lower part of the plate is partitioned as a brine circulation chamber, and a circulation path is formed through the brine circulation chamber to return the brine to the refrigerator. , a pressurizing pump and an on-off valve are provided in the circulation path, and when necessary, the on-off valve is closed to increase the pressure in the brine circulation chamber, thereby bending the plate upward, and forming a recess in the plate. An ice heat storage system characterized in that ice frozen therein is detached from said plate and floated to accumulate ice in an upper part of said ice heat storage tank.