JPH0632935U - Defroster for ice storage tank - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an ice thawing device for an ice heat storage tank capable of quickly and uniformly melting the ice in the heat storage tank. [Structure] A perforated plate is stretched horizontally in an ice heat storage tank, and return water from the load side can be sprinkled from above the perforated plate. Further, it is preferable that the pore size of the perforated plate is such that the return water accumulated on the perforated plate is maintained at a predetermined water level. With this configuration, water can be uniformly sprayed on the ice, and the volume of the ice portion appearing on the water surface can be increased by lowering the water level of the ice water phase, so that melting of the ice can be promoted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ice heat storage tank in which heat source water for air conditioning is stored in the form of coexistence with ice.

[0002]

[Prior art]

 Conventionally, when cooling and heating water is circulated through a fan coil unit installed in a building and a water side heat exchanger of a water heat source heat pump unit to perform cooling and heating, the cooling heat during cooling is stored in an ice storage tank. A heat storage system using a so-called ice heat storage method for storing in a form has been proposed. According to such a system, for example, a refrigerator is driven by electric power at night to make ice, and a large amount of cold heat is stored in the heat storage tank in the ice state, and then the cold heat of the ice is taken out as cold water during the cooling operation to obtain secondary water. It is circulated to a heat exchanger (load side heat exchanger), and since latent heat of water during solid-liquid phase transformation is used, it is possible to store a large amount of cold heat even in a small-scale device. .

[0003] More recently, a large-scale heat storage that uses a so-called multi-tank type heat storage tank that is composed of a number of tanks that use underground slabs, Equipment is also proposed.

By the way, when the cold heat stored in the ice heat storage system as described above is used by using inexpensive nighttime power, the following problems have occurred. That is, when the return water from the load side is simply returned to the heat storage tank, the flow of water into the heat storage tank is generally slow, so the ice melting in the tank becomes uneven, and the latent heat of the ice The temperature of the water supplied to the load side sometimes increased before the water could not be fully utilized.

In order to improve this, for example, as seen in “Heat storage equipment for air-conditioning” of Japanese Utility Model Laid-Open No. 4-8025 disclosed by the present applicant, the circulating water from the load side is directly fed to the ice heat storage tank from the upper part of the tank. It is possible to apply the technique of watering the ice inside. It is possible to improve the uniformity of ice melting and reduce the temperature of the water supplied to the load side by lowering the temperature of the water supplied to the load side by spraying the circulating water directly onto the ice, as in the above device. However, for example, if the water level of the ice water phase stored in the heat storage tank rises and the volume of the ice portion appearing on the water surface decreases, the effect of direct watering will decrease.

[0006]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems of the conventional heat storage tank, and it is possible to solve the uneven melting of ice and to quickly melt the ice in the heat storage tank. An object of the present invention is to provide a new and improved ice defrosting device for an ice storage tank, which is possible and can be easily applied to existing heat storage equipment without the need for new piping work. It is what

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, according to the present invention, an ice heat storage tank for storing ice / water slurry as a heat source water for air conditioning, and a water flowed outside the ice heat storage tank are provided. A subcooler capable of cooling to a cooling zone, and a system for continuously passing water in the ice heat storage tank into the subcooler to discharge supercooled water from a discharge end of the subcooler. Means for converting the supercooled water into ice / water slurry and introducing it into the ice heat storage tank, and return water from the load side for defrosting the ice / water slurry stored in the ice heat storage tank In the ice heat storage tank consisting of a system for introducing the above into the ice heat storage tank, the perforated plate is stretched horizontally in the ice heat storage tank, and the return water from the load side can be sprayed from above the perforated plate. There is provided an ice thawing device for an ice heat storage tank, which is characterized by being configured.

According to another aspect of the present invention, the hole diameter of the perforated plate installed in the ice heat storage tank as described above is set so that the return water accumulated on the perforated plate has a predetermined water level, preferably 100. It is preferable to set the opening degree such that the opening degree is maintained at about mm.

[0009]

[Action]

 According to the present invention, the return water on the load side is sprinkled from the top of the perforated plate and is evenly sprinkled on the ice stored in the ice storage tank through the holes of the perforated plate. A uniform melting can be achieved. Further, according to another aspect of the present invention, since the return water of about 100 mm is constantly accumulated on the perforated plate, the water spray on the ice is continuously performed without interruption and accumulated on the perforated plate. It is possible to lower the water level of the ice water phase in the heat storage tank by the amount of the existing water level, and the volume of the ice portion appearing on the water surface can be increased by that much, thus accelerating the melting speed of ice. .

[0010]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the outline of a first embodiment of an ice storage tank defroster according to the present invention. The upper portion of the ice storage tank 1 is sprinkled with water for spraying return water from a load 2. Means 3 are installed below which a perforated plate 4 is horizontally stretched according to the present invention. Further, below the perforated plate, an ice filter 5 for separating ice nuclei from the ice water phase is provided.

At the time of ice storage, the heat source water in the ice heat storage tank 1 is taken in as a water phase in which ice nuclei are separated by the ice filter 5 and is supercooled via the carrier pipe 7 by driving the pump 7. It is continuously supplied to the waste container 8. The heat source water passed through the subcooler 8 is cooled to a supercooling region of 0 ° C. or lower, discharged as supercooled water into the atmosphere, and then dropped into the vertical pipe 9.

The vertical pipe 9 is a vertical pipe having an inner diameter sufficient to receive the discharge flow of the supercooled water from the subcooler 8, and the upper end of the vertical pipe 9 is formed with a divergent receiving portion 10 formed therein. The lower end thereof communicates with the carrier pipe 10. The carrier pipe 10 communicates with the bottom of the heat storage tank 1 through a valve means, and ice generated by the impact of the supercooled water discharged from the subcooler 8 falling into the vertical pipe 9. The water slurry is introduced into the heat storage tank 1 through the carrier pipe 10 while maintaining the fluid state. The ice / water slurry introduced into the heat storage tank 1 rises in the heat storage tank according to its specific gravity and is stored below the ice filter 5 as a sherbet-like cold heat source with a large ice volume.

On the other hand, the cold heat source thus stored in the heat storage tank 1 is taken through the carrier pipe 11 by driving the pump 12 during the operation such as air conditioning during the daytime, and the cold heat source such as a heat pump is supplied. It is sent to the load side heat exchanger 2. The circulating water that has been heat-exchanged and heated in the load 2 is sent to the heat storage tank 1 by the carrier pipe 13, is sprayed from above the heat storage tank 1 onto the perforated plate 4 through the water sprinkler 3, and the holes of the perforated plate are further supplied. The ice is melted by sprinkling water on the sherbet-shaped ice accumulated below through the water.

According to the present invention, the pore diameter of the perforated plate 4 is such that the circulating water sprinkled from the sprinkler flows downward through the holes of the multi-perforated plate, and at a predetermined water level 15 on the perforated plate 4. The opening degree is such that it holds while holding. Therefore, it becomes possible to lower the water level of the ice water phase portion in the heat storage tank 1 by the amount of water accumulated on the perforated plate 4, and thus the volume of the ice portion appearing on the water surface can be increased. , Can accelerate the melting of ice. Moreover, since a gap is formed between the perforated plate 4 and the ice filter 5, it is possible to make the water spray uniform and promote the melting of ice. In this way, the thawed cold heat source water is again sent from the carrier pipe 11 to the load side where it is taken, and is used for operating the air conditioning and the like.

FIG. 2 shows another embodiment of the present invention. The basic structure of this ice heat storage system is similar to that shown in FIG. 1, and therefore, the components having the same functions as those shown in FIG. 1 are designated by the same reference numerals.

In the embodiment shown in FIG. 2, instead of the water sprinkler 3, a distribution pipe 20 that communicates in the vertical direction from the lower part of the heat storage tank 1 is provided, and the distribution pipe 20 is located above the perforated plate 4. It has an opening 21. According to this configuration, the same effect as that of the device shown in FIG. 1 can be obtained by simply ejecting the circulating water from the load side through the opening 21 without installing a special device such as the sprinkler device 3. Is something that can be done.

That is, the circulating water spouted from the opening 21 forms a certain pool on the perforated plate 4, and then passes through the holes of the perforated plate to store the ice / water slurry stored below the ice filter 5. Poured on. At that time, water can be evenly sprayed on the ice through the holes of the perforated plate, and the volume of the ice part exposed on the water surface by lowering the water level of the ice-water phase by the amount of the pool formed on the perforated plate. Since the ice can be made larger, it becomes possible to accelerate the melting of ice.

Although the present invention is applied to a single tank type heat storage tank in the above-mentioned embodiment, the present invention is also applicable to a multi-tank type heat storage tank composed of a plurality of small water tanks. Needless to say.

[0019]

[Effect of device]

 As described above, according to the present invention, the return water on the load side is sprayed from the top of the perforated plate and is evenly sprayed on the ice stored in the ice heat storage tank through the holes of the multi-hole plate. A quick and uniform melting of ice can be achieved.

Further, according to another aspect of the present invention, since return water having a predetermined water level, preferably about 100 mm, is always accumulated on the perforated plate, the water spray on the ice is continuously performed without interruption. At the same time, the water level of the ice water phase in the heat storage tank can be lowered by the amount of water accumulated on the perforated plate, and the volume of the ice portion appearing on the water surface can be increased accordingly. , The melting speed of ice is accelerated.

Further, since the effect of the present invention can be achieved only by disposing the perforated plate as described above in the existing ice heat storage tank, it is possible to reduce the labor and cost for piping work and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing the configuration of a first embodiment of an ice heat storage tank to which the present invention is applied.

FIG. 2 is a schematic diagram showing a configuration of a second embodiment of an ice heat storage tank to which the present invention is applied.

[Explanation of symbols]

 1 Ice Storage Tank 2 Load 3 Sprinkler 4 Porous Plate 5 Ice Filter 6 Pump 7 Conveyor Pipe 8 Supercooler 9 Vertical Pipe 10 Conveyor Pipe 11 Conveyor Pipe 12 Pump 13 Conveyor Pipe

Claims (2)

[Scope of utility model registration request] 1. An ice heat storage tank for storing ice / water slurry as a heat source water for air conditioning, and supercooling which is installed outside the ice heat storage tank and which allows water to flow to a supercooling region. A vessel,
A system for continuously passing water in the ice heat storage tank into the subcooler and discharging the supercooled water from the discharge end of the subcooler, and converting the supercooled water into ice / water slurry And a system for guiding the return water from the load side into the ice heat storage tank to dissolve the ice / water slurry stored in the ice heat storage tank. In the ice heat storage tank consisting of, the perforated plate is stretched horizontally in the ice heat storage tank,
An ice-thawing device for an ice storage tank, characterized in that return water from the load side can be sprayed from above the perforated plate. 2. An ice thawing device for an ice heat storage tank, wherein the pore size of the perforated plate is set to an opening degree such that return water accumulated on the perforated plate is maintained at a predetermined water level.