JP3344813B2 - Dynamic ice heat storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes use of the endothermic effect of ice by freezing water by direct contact between water and a liquid having a specific gravity higher than that of water below the freezing point of water and not being dissolved in water. The present invention relates to a dynamic ice heat storage device.

[0002]

2. Description of the Related Art An air conditioning system provided with an ice heat storage device shifts a part of cooling power demand, which is concentrated in the daytime in summer, to nighttime, thereby enabling power leveling. In other words, by using low-cost nighttime electric power to perform cold storage heat and using this cold storage heat for daytime cooling, users can obtain air conditioning with low running costs, while the power company can install equipment due to peak shifts in power demand. The operation rate is improved.

The ice making method of the ice heat storage device is roughly classified into a static type in which icing and deicing are performed on an ice making heat exchanger, and a dynamic type in which icing is not performed on the ice making heat exchanger.

In general, the static type has a simple structure, but the heat transfer resistance increases with the growth of ice.
While the cooling temperature for ice making must be gradually lowered, there are inherent drawbacks such as reduced efficiency,
The dynamic type allows the cooling temperature of the refrigerant to be higher than that of the static type, so the coefficient of performance of the refrigerator is good, and there is no need to arrange a heat exchanger or the like in the ice heat storage tank, and the ice filling rate (IPF: Ice Packing Factor)
Also improve.

There are various types of dynamic type,
In addition, a water-insoluble liquid (refrigerant) with a specific gravity of 1 or more at low temperature
There is a method of making ice by direct contact between water and water. this is,
The non-water-soluble liquid existing at the bottom of the heat storage tank is cooled to 0 ° C. or lower and jetted into water through a nozzle arranged in the heat storage tank. Due to the circulation of the cooled water-insoluble liquid, sherbet-like ice (ice particles) is generated in the heat storage tank, and the ice rises due to buoyancy, is stored from the upper part of the heat storage tank, and floats. . Then, if necessary, the heat absorbing action at the time of melting of the ice is utilized for the cooling operation of the air conditioner.

[0006]

However, in the dynamic type ice thermal storage system as described above, since the sherbet-like ice generated and floating hardly compresses between the ices, the volume ratio occupied by the ice is low. Low, IPF
However, there is a low disadvantage.

Further, a part of the sherbet-shaped ice may fall to the bottom of the ice heat storage tank together with the water-insoluble liquid without rising, and may remain as an ice block. As this ice block grows,
There is a problem that the nozzle for ejecting the water-insoluble liquid is clogged, and it is impossible to continue ice making.

On the other hand, in order to increase the filling rate of ice, a water-insoluble liquid is further dropped from above the ice-formed sherbet-like ice to produce porous ice as if the sherbet-like ice were condensed. There is a way. However, in this method, a part of the water-insoluble liquid is trapped in the generated porous ice, and there is a problem that ice-making cannot be performed due to a shortage of the water-insoluble liquid.

Therefore, an object of the present invention is to further improve the filling rate of ice generated in an ice heat storage tank.

[0010]

Means for Solving the Problems] To achieve the above object, in the first aspect of the present invention, water and a water-insoluble liquid having a larger specific gravity than water accommodated in the ice thermal storage tank, the In the area where the water-insoluble liquid is stored in the ice heat storage tank, a feeding means for collecting the water-insoluble liquid staying at the bottom and feeding the water-insoluble liquid on the way, and a cooling means for cooling the water-insoluble liquid are provided. Connect one end of a liquid recovery pipe provided respectively, and connect one end of a water recovery pipe provided with a feeding means for collecting water and feeding water in the area of the ice heat storage tank in which water is stored. The other end of each of the liquid recovery pipe and the water recovery pipe is connected to an ice maker that directly contacts a water-insoluble liquid and water to generate ice, and a discharge port of the ice maker is connected to the ice heat storage tank. while located in the upper space of the inner, non-aqueous liquid flowing through the liquid recovery pipe A flow rate detecting means for detecting the amount, a bypass pipe through which the non-aqueous liquid flows by bypassing the cooling means, and when the flow rate detected by the flow rate detecting means becomes equal to or less than a set value, the non-aqueous liquid passes through the bypass. characterized in that it comprises a switching means capable of switching to flow in the pipe side. Further, in claim 2 of the present invention,
Water and a water-insoluble liquid having a higher specific gravity than water are stored in an ice thermal storage tank.
The area where the water-insoluble liquid of the ice thermal storage tank is stored
The water-insoluble liquid remaining at the bottom
Feeding means for feeding the water-soluble liquid and cooling the water-insoluble liquid
Connect one end of liquid recovery pipe with cooling means
And in the area of the ice heat storage tank where water is stored,
Water recovery equipped with feeding means for collecting water and feeding water on the way
Connect one end of the pipe to the liquid recovery pipe and water recovery pipe.
The other end of each tube is in direct contact with water-insoluble liquid and water
Connected to an ice maker that produces ice and discharges this ice maker
While placing the mouth in the upper space in the ice thermal storage tank,
The upper part in the ice storage tank in front of the discharge direction of the ice device discharge port
Supercooled state of water that is placed in the space and discharged from the discharge port
To release the supercooling, or discharge from the discharge port
Mixing means for mixing water and a water-insoluble liquid;
The flow rate that detects the flow rate of the water-insoluble liquid flowing through the body recovery pipe
The water-insoluble liquid flows by bypassing the detecting means and the cooling means.
And the flow rate detected by the flow rate detecting means.
Is less than the set value, the water-insoluble liquid
And cormorant switchable switching means flowing to the path piping side
It is characterized by having.

[0011]

According to the dynamic ice heat storage device having such a configuration, the water-insoluble liquid cooled by the cooling means passing through the liquid recovery pipe and the water passing through the water pipe reach the ice maker and directly interact with each other. Upon contact, the water is cooled below 0 ° C. by the non-aqueous liquid to form ice. The generated ice is discharged from the discharge port arranged in the upper space of the ice storage tank, falls into the water and accumulates, so that the space between the ice is compressed, the volume ratio occupied by the ice increases, and the ice is filled. The rate is improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a dynamic ice heat storage device according to a first embodiment of the present invention. The inside of the ice heat storage tank 1 is filled with water 3 which is a heat storage medium and a refrigerant 5 which is a water-insoluble liquid having a specific gravity higher than that of the water 3 at a liquid temperature equal to or lower than the freezing point of the water 3, that is, 0 ° C. or lower. Most of the refrigerant 5 having a higher specific gravity than the water 3 separates from the water 3 and precipitates at the bottom of the ice heat storage tank 1.

One end of a liquid recovery pipe 7 for recovering the refrigerant 5 is connected to a side surface of a region in the lower part of the ice heat storage tank 1 where the refrigerant 5 is stored. The liquid recovery pipe 7 is provided with a circulation pump 9 as a feeding means and a refrigerator 11 as a cooling means in order from the ice heat storage tank 1 side. The circulating pump 9 sucks the refrigerant 5 in the ice heat storage tank 1 and sends it to the refrigerator 11 side.
It cools below.

One end of a water recovery pipe 13 for recovering water is connected to a side surface of a region where water is stored below the ice heat storage tank 1. The water recovery pipe 13 is provided with a circulation pump 15 serving as a feeding means.

On the other hand, an ice maker 17 is placed above the ice heat storage tank 1.
Is provided. The ice maker 17 has a cylindrical shape, and a discharge port 19 at the tip thereof is disposed in an upper space 21 in the ice heat storage tank 1. The other end of the ice making device 17 on the side opposite to the discharge port 19 is disposed outside the ice heat storage tank 1, and near the end, the other ends of the liquid recovery pipe 7 and the water recovery pipe 13 are connected. Refrigerant and water are supplied into the vessel 17.

In the dynamic ice heat storage device having such a configuration, the refrigerant 5 staying at the bottom of the ice heat storage tank 1 is sent by the circulation pump 9 through the liquid recovery pipe 7 to the refrigerator 11, where the refrigerant 5 is cooled to 0 ° C. It is cooled below and supplied to the ice maker 17. The water in the ice heat storage tank 1 is also supplied to the ice maker 17 through the water recovery pipe 13 by the circulation pump 15.

In the ice maker 17, the refrigerant and the water flow toward the discharge port 19 while being in direct contact with each other. In this process, the water 3 is cooled to 0 ° C. or less, and ice is deposited. The ice generated in the ice maker 17 is discharged from the discharge port 19, falls into the water from the upper part of the ice heat storage tank 1, and accumulates in the ice heat storage tank 1 as sherbet-like ice 23. The refrigerant that has made ice by exchanging heat with water stays at the bottom of the ice heat storage tank 1 due to a difference in specific gravity.

In the process of accumulating sherbet-like ice 23 in the ice heat storage tank 1, the discharged ice falls from the upper part of the ice heat storage tank 1, so that the ice space is compressed and the volume ratio occupied by the ice is reduced. As a result, the filling rate of ice in the ice heat storage tank 1 increases.
This makes it possible to make the ice heat storage tank 1 compact when the ice filling amount is equal.

Further, since the discharge port 19 of the ice maker 17 is located in the upper space 21 of the ice heat storage tank 1, clogging of the discharge port 19 with ice is avoided, and the ice making operation can be continued for a long time. And the reliability of the device is improved. Further, the generated ice 23 has a sherbet shape and does not generate porous hard ice.
No trap is generated in the inside 3, and the circulation amount of the refrigerant 5 is maintained at a desired level without shortage, and ice making can be continuously performed.

FIG. 2 is an overall configuration diagram of a dynamic ice heat storage device showing a second embodiment of the present invention. In this embodiment, a plate-like member 25 protruding from the inner wall is installed in the upper space 21 of the ice heat storage tank 1 on the side opposite to the position where the ice maker 17 is provided. The plate-like member 25 is formed to extend in a direction perpendicular to the paper surface in FIG.
Upper space 21 of ice thermal storage tank 1 in front of discharge direction from
It is located in. Other configurations are the same as those of the first embodiment shown in FIG.

In the ice maker 17, not all of the water becomes ice. Therefore, from the discharge port 19, in addition to the generated ice, a mixed liquid of a refrigerant and supercooled water, and water and water. In some cases, a refrigerant that is not completely exchanged and remains at 0 ° C. or lower is discharged. When the supercooled water collides with the plate member 25, the impact at this time releases the supercooled state, and ice is deposited. In addition, the refrigerant at 0 ° C. or lower is
At the same time, mixing with the water being discharged at the same time is promoted, heat exchange is performed, and ice is precipitated. For this reason, the plate-like member 25 constitutes a supercooling release unit for releasing the supercooled water and a mixing unit for mixing the refrigerant and the water.

According to the above-described embodiment, the water that has not been completely turned into ice by the ice maker 17 and has been discharged in a supercooled state becomes ice when the supercooling is released and remains at 0 ° C. or lower. After the refrigerant is discharged, it mixes with water and exchanges heat to precipitate ice, so that the ice making rate can be improved as compared with the first embodiment of FIG.
Conversely, in the case of this embodiment, it is not necessary to completely cancel the supercooling of water and completely perform heat exchange (mixing of refrigerant and water) in the ice maker 17. In order to completely cancel the supercooling and perform the heat exchange in the ice maker 17, it is necessary to make the size (length) of the refrigerant and the water at the discharge port 19 constant so that the temperature becomes 0 ° C. Therefore, in the second embodiment, the size, length, and the like of the ice maker 17 can be made compact, and accordingly, the design of the ice maker 17 becomes easy.

Further, since it is not necessary to complete ice making in the ice maker 17, clogging with ice in the ice maker 17 is suppressed, clogging at the discharge port 19 is avoided, and the ice making operation can be continued. it can.

FIG. 3 is an overall configuration diagram of a dynamic ice heat storage device showing a third embodiment of the present invention. In this embodiment, a liquid recovery pipe 7 between the refrigerator 11 and the ice maker 17 is used.
Is provided with a flow rate sensor 27 as flow rate detecting means, and the liquid recovery pipe 7 between the flow rate sensor 27 and the ice maker 17 and the liquid recovery pipe 7 between the refrigerator 11 and the circulation pump 9 are provided. , Bypass pipe 29 for bypassing refrigerator 11
Connected by Refrigerator 11 of bypass pipe 29
At the connection to the liquid recovery pipe 7 between the pump and the circulation pump 9, there is provided a three-way valve 31 for flowing the refrigerant discharged from the circulation pump 9 to either the refrigerator 11 or the bypass pipe 29. . The three-way valve 31 is set so that the refrigerant discharged from the circulation pump 9 flows to the refrigerator 11 during a normal ice making operation.

The flow rate signal detected by the flow rate sensor 27 is input to the control circuit 33. When the input flow rate value becomes equal to or less than the set value, the control circuit 33 switches the three-way valve 31 to switch from the circulating pump 9. Is controlled to flow to the bypass pipe 29 side. After switching the three-way valve 31, after a predetermined time has elapsed, the refrigerant is switched again so as to flow to the refrigerator 11 side. Other configurations are the same as those of the second embodiment shown in FIG.

FIG. 4 is a flowchart showing the control operation of the control circuit 33 in the above configuration. In the state where the ice making operation is being performed (step 101), when the detected value of the flow rate sensor 27 becomes equal to or less than the set value and the refrigerant flow rate is reduced (step 103), the flow path is formed by the ice generated in the ice maker 17. When it is determined that the pressure has narrowed, the three-way valve 31 is switched (step 105), and the refrigerant discharged from the circulation pump 9 flows to the bypass pipe 29 side. After the switching of the three-way valve 31, after a lapse of a predetermined time (step 107), the three-way valve 31 is returned to the original state so that the refrigerant flows toward the refrigerator 11 (step 109), and the ice making operation is restarted.

When the refrigerant passes through the bypass pipe 29 for a predetermined time without passing through the refrigerator 11, the uncooled refrigerant is supplied to the ice maker 17 to melt the ice, thereby obstructing the passage in the ice maker 17. Thus, the ice making operation can be continued. If the flow rate decreases and a slight blockage occurs in the ice maker 17 even if the detection value of the flow rate sensor 27 does not fall below the set value, the ice flow naturally increases due to the increase in the flow velocity due to the narrow flow path. And the blockage is avoided.

[0029]

As described above, according to the present invention, the outlet of an ice maker for making ice by directly contacting water and a refrigerant cooled to 0.degree. Because it is located in the upper space in the tank, the ice generated in the ice maker and discharged from the discharge port falls into the water in the ice storage tank and accumulates, and the ice can be compressed, and the volume occupied by ice Rate can be increased, and the ice filling rate can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a dynamic ice heat storage device according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a dynamic ice heat storage device according to a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a dynamic ice heat storage device according to a third embodiment of the present invention.

FIG. 4 is a flowchart showing an operation in the embodiment of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ice heat storage tank 3 Water 5 Refrigerant (non-water-soluble liquid) 7 Liquid recovery pipe 9, 15 Circulation pump (feeding means) 11 Refrigerator (cooling means) 13 Water recovery pipe 17 Ice maker 19 Discharge port 21 Ice storage tank Upper space 23 Ice 25 Plate-like member (supercooling releasing means, mixing means) 27 Flow rate sensor (flow rate detecting means) 29 Bypass pipe 31 Three-way valve (switching means)

Continuation of the front page (72) Inventor Toshihiro Yamamoto 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Corporation Living Space Systems Research Institute (56) References JP-A-4-313658 (JP, A) JP-A-5 JP-A-248666 (JP, A) JP-A-4-143535 (JP, A) JP-A-5-141720 (JP, A) JP-A-3-59335 (JP, A) JP-A-4-353375 (JP, A) JP-A-5-18562 (JP, A) JP-A-4-129039 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25C 1/00-1/12 F25C 1 / 16-5/18 F24F 5/00

Claims (2)

(57) [Claims] 1. A water-insoluble liquid having a specific gravity greater than that of water is stored in an ice heat storage tank, and a non-water-soluble liquid staying at the bottom of the ice heat storage tank in a region where the water-insoluble liquid is stored. One end of a liquid recovery pipe, which is provided with a feeding means for feeding the water-insoluble liquid and a cooling means for cooling the water-insoluble liquid in the middle, is connected, and the water in the ice heat storage tank is stored. One end of a water recovery pipe provided with a feeding means for collecting water and feeding water on the way to the area, and connecting the other end of the liquid recovery pipe and the other end of the water recovery pipe to a water-insoluble liquid and water, respectively. Is connected directly to an ice maker that produces ice, and the outlet of the ice maker is arranged in the upper space in the ice heat storage tank .
On the other hand, a flow rate detecting means for detecting a flow rate of the water-insoluble liquid flowing through the liquid recovery pipe, a bypass pipe through which the water-insoluble liquid flows by bypassing the cooling means, and a flow rate detected by the flow rate detecting means is a set value. It follows when it becomes a dynamic type ice cold storage device, wherein a water-insoluble liquid and a switching means capable of switching to flow in the bypass pipe side. 2. An ice heat storage tank containing water and a water-insoluble liquid having a specific gravity greater than that of water, and a non-water-soluble liquid staying at the bottom of the ice heat storage tank in a region where the water-insoluble liquid is stored. One end of a liquid recovery pipe, which is provided with a feeding means for feeding the water-insoluble liquid and a cooling means for cooling the water-insoluble liquid in the middle, is connected, and the water in the ice heat storage tank is stored. One end of a water recovery pipe provided with a feeding means for collecting water and feeding water on the way to the area, and connecting the other end of the liquid recovery pipe and the other end of the water recovery pipe to a water-insoluble liquid and water, respectively. Is connected directly to an ice maker that produces ice, and the outlet of the ice maker is arranged in the upper space in the ice heat storage tank .
On the other hand, supercooling release means for releasing the supercooled state of water discharged from the discharge port , which is disposed in an upper space in the ice heat storage tank in front of the discharge direction of the discharge port of the ice making device, or discharged from the discharge port. and mixing means for mixing that the water-soluble liquid, a flow rate detecting means for detecting the flow rate of the water-insoluble liquid flowing through the liquid recovery pipe, a bypass pipe which flows bypassing the cooling means water-insoluble liquid when the flow rate the flow rate detecting unit detects is equal to or less than a set value, the dynamic ice storage water-insoluble liquid is characterized by comprising a switching means capable of switching to flow in the bypass pipe side apparatus.