JPH0791692A - Ice heat accumulation device - Google Patents

Abstract

PURPOSE:To enable an efficient ice making and ice storing operation to be carried out by a method wherein refrigerant liquid is injected into an ice making tank, a water swirl is generated and the produced ices are transported and flowed into an ice storing tank through a swirl. CONSTITUTION:Refrigerant liquid 2 cooled by a cooling device 1 to 0 deg.C or less is injected from a nozzle 4 within an ice making tank 3 into water 5. The injected refrigerant liquid 2 drops into the ice making tank 3 while being swirl and stored at the ice making tank 3. The refrigerant liquid 2 is fed again from it to a cooling device 1. At this time, refrigerant having a high specific weight is dropped downwardly while being pushed against a wall surface of the ice making tank 3 under a centrifugal separating action, resulting in that the refrigerant liquid 2 and the water 5 are separated from each other. Since ice and water at a central part of the tank 3 are carried upwardly together with the swirl and an upward directed flow toward the central part of the ice making tank 3 produced due to a difference in density, ice 6 containing refrigerant liquid 2 is prevented from being accumulated at an interface between the refrigerant liquid 2 and the water. With such an arrangement as above, it is possible to perform an efficient ice making and ice storing operation.

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 device which stores ice as a heat storage medium and utilizes an endothermic action due to its melting during cooling load.

[0002]

2. Description of the Related Art In recent years, an air conditioning system in an industrial plant or a high-rise building operates a heat pump by using cheap electric power at night to generate cold water or hot water to store heat, which is mainly used for daytime air conditioning load. Various heat storage type air-conditioning systems used for the above have been proposed. In recent years, the cooling load in the summer has increased rapidly, and it has started to become a social problem from the viewpoint of stable power supply. To cope with this, the ice storage capacity, which has a dramatic increase in heat storage capacity compared to conventional water, increases. Practical application of heat storage devices is steadily progressing.

By the way, a buffer substance (ex. Water) is intended for use as an accumulator because of a low temperature source.
Further, a method of directly contacting a refrigerant liquid having a higher specific gravity than that and generating a low temperature source is disclosed in JP-A-56-25664. US Pat. No. 2,996,894 proposes a patent of the above type for the purpose of using it as a low heat source for a heat pump. In the proposal, the refrigerant liquid has a specific gravity smaller than that of the buffer substance. Further, in French Patent No. 1360833, a coolant liquid cooled below the freezing point of the buffer substance is suspended on the buffer substance,
It has been proposed to vigorously stir with a stirrer to transfer heat and cool the buffer substance. Further, in German Laid-Open Patent Publication No. 2508447, a buffer substance is pumped from the bottom of the container to the top and brought into contact with the cooled refrigerant liquid or gas circulating therein to accumulate a low temperature. There is.

Various types of these ice heat storage devices have been proposed as described above, but one of their outstanding advantages is that they produce sherbet-shaped ice.
Other examples include JP-A 1-144721, JP-A 1-244225, JP-A 2-097845, and JP-A 3-140767.

That is, the direct contact ice making method for producing ice in the sherbet state described above is a type in which a part of water is made into ice by cooling the refrigerant liquid and bringing it into direct contact with water for heat exchange. Therefore, the heat transfer efficiency is extremely high and the ice making efficiency is high.

However, the refrigerant liquid in the system intended to be used as the above-mentioned accumulator is not necessarily excellent in heat transfer property. Also,
If you try to increase the ice making speed by strongly ejecting the refrigerant liquid whose specific gravity is close to that of water into the water in the heat storage tank or stirring the inside of the heat storage tank, the water and the refrigerant liquid become an emulsion state and become turbid. It takes a long time to separate the two.

Particularly, when a refrigerant liquid having a specific gravity smaller than that of water is used, it is almost impossible to separate it from the produced ice. Therefore, recently, a refrigerant liquid having a larger specific gravity than water is mainly used.

As a method of extracting cold heat stored in the form of ice, a method of supplying cold water obtained as a result of thawing by sprinkling water to a load has been performed conventionally, but recently, power for cold heat transfer has been used. In order to reduce the pipe diameter, cold heat transfer by two-phase flow of ice water, which has a high heat transfer force, has been attempted. At that time, it is clear from the results of the study that the flow resistance of the ice water in the pipe becomes smaller when the size of the ice is different.

[0009]

In the system as described above, when a water-insoluble refrigerant having a higher specific gravity than water is jetted into water to cool the water and cause the ice to precipitate, most of the ice is buoyant. It moves to the upper part, but when the refrigerant liquid is ejected into the water, and the ice just generated due to the momentum when it falls is dragged downward, and the refrigerant liquid falls on it and contains the refrigerant liquid. This has the adverse effect that ice that does not rise accumulates at the interface between the coolant and water. In such a state, the circulation of the refrigerant liquid is hindered by the non-floating ice accumulated on the interface.

Further, there is a possibility that the dragged ice water is caught in the refrigerant liquid, and the refrigerant liquid mixed with water enters the cooler. If the refrigerant liquid mixed with ice water enters the cooler, there is a risk of freeze blocking inside the evaporator.

Further, in order to reduce the flow resistance in the pipe during the transportation of ice water, a method of making ice of various sizes has been carried out up to now to break large ice into large, medium and small ones. The idea is to make ice of a size. This method requires extra power and control mechanisms to break the ice. An object of the present invention is to provide an ice heat storage device capable of efficiently making and storing ice.

[0012]

According to the present invention, a cooling device capable of cooling a water-insoluble refrigerant liquid having a larger specific gravity than water to 0 ° C. or less, and the refrigerant liquid cooled to 0 ° C. or less are jetted. An ice-making tank in which water is stored, the refrigerant liquid is ejected through a nozzle portion provided in the ice-making tank to generate a swirling water flow, and a circulation pump that circulates between the cooling device and the stored water. It comprises a reflux means for refluxing the water in the tank to the ice making tank, and a carrying and circulating means for carrying and circulating the ice produced in the ice making tank to the water storage tank through the swirling flow.

[0013]

With the above structure, it is possible to efficiently make ice and store water.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the refrigerant liquid 2 cooled in the cooling device 1 is jetted into the water 5 from the jet nozzle 4 provided in the ice making tank 3. At this time, the nozzle 4 is installed at a predetermined angle with respect to the wall surface of the ice making tank so that a swirling flow is generated in the water 5. The ice making tank 3 has a cylindrical shape body 7 in which a swirl flow is likely to occur, and the bottom of the ice making tank 3 has a conical shape body 8. The jetted refrigerant liquid 2 is swirling, falls in the ice making tank 3, and collects at the bottom of the ice making tank 3. From there, the coolant liquid 2 is led again to the cooling device 1. Since the refrigerant liquid 2 is jetted so as to cause a swirl flow in the water 5 in the ice making tank 3, the refrigerant having a large specific gravity is pressed against the wall surface of the ice making tank 3 due to the centrifugal separation action and settles downward,
The refrigerant liquid 2 and the water 5 are separated. In addition, the swirling flow and the upward flow in the center of the ice making tank 3 caused by the density difference cause the ice water in the center of the tank to be carried upward,
It is possible to prevent ice containing the refrigerant liquid from accumulating at the refrigerant liquid-water interface.

As shown in FIGS. 2 and 3, the ice 6 produced in the ice making tank 3 is conveyed to the ice storage tank 11 by the circulating water (outgoing) 13, and the circulating water (return) 14 from the ice storage tank 11 is made into ice. It flows into the tank 3 so as to generate a swirling flow. FIG. 3 is a top view of the inside of the ice making tank 3.

Another embodiment will be described with reference to FIGS. A swirl avoidance plate (15) for avoiding the influence of a swirling flow is installed above the refrigerant liquid intake port (10). When the above-mentioned configuration is adopted and the refrigerant liquid 2 is ejected into water, the refrigerant liquid 2 is recovered from the bottom of the ice making tank 3 without entraining the water 5 and the ice 6, and the ice 6 is the refrigerant liquid 2-water. 5 It rises quickly without accumulating at the interface. Further, the swirl avoidance plate 15 can prevent the ice water from entering the refrigerant liquid suction port 10 into the ice water.

As shown in FIG. 6 and FIG. 7, three types of refrigerant liquid ejection nozzles having different shapes are prepared. Nothing is inserted into the nozzle port 16, and a pipe with a diameter of about 12 mm is provided at the nozzle port. There are three types, 17 of which are inserted in a bundle and 18 of which a tube with a diameter of about 5 mm is inserted in a bundle at the nozzle opening. This produces ice of different sizes,
It is possible to reduce flow resistance in the pipe when ice water is transported from the ice making tank to the water storage tank and when cold heat is supplied to the load destination.

[0018]

As described above, according to the present invention,
It is possible to provide an ice heat storage device that efficiently makes ice and stores water.

[Brief description of drawings]

FIG. 1 is a partial configuration diagram showing an ice heat storage device according to an embodiment of the present invention.

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

FIG. 3 is a top view of a main part according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of main parts for explaining another embodiment of the present invention.

5 is a top view according to FIG.

FIG. 6 is a configuration diagram of a main part according to still another embodiment of the present invention.

FIG. 7 is an enlarged view of an example of the refrigerant liquid ejection nozzle port shown in FIG.

[Explanation of symbols]

 1 ... Cooling device 2 ... Refrigerant liquid 3 ... Ice making tank 4 ... Nozzle 5 ... Water 6 ... Ice 7 ... Cylindrical body 8 ... Conical body 9 ... Refrigerant liquid circulation pump 10 ... Refrigerant liquid suction port 11 ... Ice storage tank 12 ... Water circulation Pump 13… Circulating water (forward) 14… Circulating water (return) 15… Vortex entrainment avoidance plate 16… Nozzle that does not insert anything into the nozzle port 17… Nozzle in which a 12 mm tube is bundled and inserted into the nozzle port 18… Nozzle Nozzle with a bundle of about 5 mm tubes inserted into the mouth

Claims (4)

[Claims] 1. A cooling device capable of cooling a water-insoluble refrigerant liquid having a larger specific gravity than water to 0 ° C. or less, and an ice-making tank storing water from which the refrigerant liquid cooled to 0 ° C. or less is jetted. And a circulation pump for ejecting the refrigerant liquid through a nozzle portion provided in the ice making tank to generate a swirling water flow and circulating between the cooling device and water in the water storage tank to the ice making tank. An ice heat storage device comprising: a reflux means for refluxing; and a transport circulation means for transporting the ice generated in the ice making tank to the water storage tank through the swirling flow. 2. The ice heat storage device according to claim 1, wherein the reflux means includes a nozzle portion provided in the ice making device and ejecting water to generate a swirling flow. 3. The ice heat storage device according to claim 1, wherein the nozzle portion includes a plurality of nozzles having different ejection port shapes of the refrigerant liquid. 4. The ice heat storage device according to claim 1, wherein the bottom of the ice making device is provided with an avoiding means for avoiding an influence of the swirling flow to facilitate recovery and circulation of the refrigerant liquid.