JPH05223291A - Ice cold accumulator - Google Patents

Abstract

PURPOSE:To provide an ice cold accumulator in which an ice generating speed is fast and stable, a decrease in an efficiency of a refrigerator and damage of a heat transfer tube are prevented, and generation of corrosive gas due to mixture of water and refrigerant and change of physical properties of the refrigerant are eliminated in ice-making steps of the accumulator. CONSTITUTION:The ice cold accumulator comprises an ice-making tank 1 for storing refrigerant 4 insoluble in water and having a specific weight of 1.5 times as large as that of water and a solidifying temperature is 20 degrees or lower and water 9, a tube 7 for circulating the refrigerant to maintain a temperature of the refrigerant 4 at 0 degree or lower thereby to circulate it in the tank 1, a storage tank 2 for receiving ice crystal 10 generated in the tank 1 to store it, a water tube 12 for supplying water of the tank 2 to the tank 1, and a refrigerant nozzle 8 provided in the tank 1 to inject the refrigerant 4 from a refrigerant layer of a lower part of the ice-making tank into upper water.

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 for air conditioning.

[0002]

2. Description of the Related Art An air-conditioning system having an ice heat storage device reduces the load of heat source equipment by using inexpensive late-night power for the purpose of reducing the power demand for cooling concentrated in the daytime, such as building air-conditioning and district heat supply. There is an application to a relatively large capacity air conditioning system. There are roughly two types of ice production methods for this ice heat storage device, an indirect heat exchange method and a direct heat exchange method.

The indirect heat exchange system has a heat transfer tube for ice making in an ice heat storage tank, and a low temperature refrigerant is circulated inside or outside the heat transfer tube to generate ice outside or inside the heat transfer tube. Is.

The indirect heat exchange system is a system in which an antifreeze liquid such as ethylene glycol or Freon is used as a refrigerant to generate ice on the outside or inside of the heat transfer tube. With the increase in ice thickness to generate ice, the heat transfer from the refrigerant to the ice decreases and the ice formation rate slows down, which has the drawback of reducing the efficiency of the refrigerator for cooling the refrigerant. ing.

When the heat transfer tubes are arranged in the ice heat storage tank, since ice is generated outside the heat transfer tubes, the number of heat transfer tubes is increased to improve the efficiency of the ice heat storage tank. The filling rate of ice will be reduced by the increase of the heat tubes.

On the other hand, if the number of heat transfer tubes is reduced to increase the thickness of ice deposited on the heat transfer tubes, not only the speed of ice formation slows down, but also the portion of the heat transfer tubes where the ice is easily melted at the time of defrosting. As a result, the ice becomes uneven and the efficiency decreases,
When icing on the heat transfer tube again, icing starts from the icing part, so the thick part becomes thicker and eventually the ice and ice may come into contact with each other, causing an accident such as bending or damage of the heat transfer tube. ..

On the other hand, the direct heat exchange system is a system in which a low-temperature refrigerant is directly circulated in the ice heat storage tank to generate ice. Since water and ice are generated in the ice heat storage tank, the efficiency of the refrigerator is high. Improves, but since refrigerant gas enters water, water and refrigerant gas react with each other to generate corrosive gas or change the physical properties of the refrigerant itself, resulting in explosion under certain conditions There are some cases.

[0008]

In the indirect heat exchange system, the efficiency of the refrigerator is reduced due to the slow ice production rate,
There are problems such as reduced efficiency of the refrigerator and damage to the heat transfer tubes due to non-uniformity of ice on the icing area. Further, in the indirect heat exchange system, there are problems that water and a refrigerant gas react with each other to generate a corrosive gas, or the physical properties of the refrigerant itself change.

The present invention has been made in view of the above problems, and improves the efficiency of the refrigerator so that the physical properties of the refrigerant body itself, which does not generate corrosive gas, do not change. The purpose is to provide a new ice heat storage device.

[0010]

In order to solve the above problems, the ice heat storage device of the present invention comprises a refrigerant and water which have a specific weight of 1.5 times or more of water and a freezing point of -20 ° C. An ice making tank, a refrigerant circulation path for circulating the inside of the ice making tank while maintaining the refrigerant at 0 ° C. or less, a water storage tank for inflowing and storing the ice crystals generated in the ice making tank, and this water storage A water pipe that connects the tank and the ice making tank to supply water in the water storage tank to the ice making tank, and a refrigerant nozzle that is provided in the ice making tank and ejects a refrigerant toward the upper water from the refrigerant layer at the bottom of the ice making tank And the configuration.

[0011]

[Function] When a refrigerant, especially a Fluorinert (trade name, manufactured by 3M Company in the United States) liquid is used as an example, the Fluorinert liquid is a colorless, transparent, odorless and inert liquid having a completely fluorinated structure. In most cases, the boiling point and freezing point of the combination of carbon atom C and fluorine atom F differ depending on the number of bonds, but the freezing point is -20 ° C or lower in most cases.

The specific weight of this Fluorinert solution is 1.7 times or more that of water (about twice as much as that of ice) at around 0 ° C., and the solubility in water is 7.2 ppm at a temperature of 10 ° C. Even if they are mixed, they will be completely separated and the Fluorinert liquid will precipitate and the water will float.

By utilizing the characteristics of this refrigerant (Fluorinert liquid), the refrigerant is stored at the bottom of the ice making tank, and this refrigerant is cooled directly or indirectly by a refrigerator so that the refrigerant in the refrigerant liquid at the bottom of the ice making tank is The water is sprayed from the refrigerant nozzle to turn the water in the ice-making tank into ice crystals, and the water near 0 ° C. and the precipitated ice crystals are sent to the water storage tank for heat storage.

[0014]

FIG. 1 shows a cross-sectional structure of an essential part of an embodiment of the ice heat storage device of the present invention. The ice heat storage device is an ice making tank 1.
And a water tank 2, and a refrigerant 4 is provided on the bottom portion 3 of the ice making tank 1.
(Fluorinert liquid) is stored, the refrigerant pump 5, the refrigerator 6
The cooling medium 4 is cooled via the cooling medium and sprayed from the cooling medium nozzle 8 at the lower part of the ice making tank by the cooling medium pipe 7. The sprayed refrigerant 4 exchanges heat with water 9 to partially form ice crystals 10, and the refrigerant 4 heavier than the water 9 returns to the bottom portion 3 of the ice making tank 1 again.

The bottom of the water storage tank 2 arranged beside the ice making tank 1.
Water from 11 is supplied to the ice making tank 1 by the water pipe 12 and the water pump 13.
The upper part of the ice making tank 1 which is sent to the underwater portion 14 on the upper surface of the refrigerant 4 inside passes through the flow path 15 having a width equal to the width of the ice making tank, and the water 9 and the ice crystals 10 are mixed with each other. Flow into.

A flow path 15 connecting the ice-making tank 1 and the water storage tank 2
Is the same width as the top of the ice making tank, and the depth is 200m from the water surface.
By setting a sufficient cross-sectional area of m to 500 mm, ice crystals
10 does not stay in the ice making tank 1. FIG. 2 shows the essential structure of the refrigerant nozzle 8 of the present invention. The refrigerant nozzle 8 is installed in the liquid of the refrigerant 4, and the refrigerant 4 cooled by the refrigerator is jetted into the underwater 9 in the upper part.

The ejected refrigerant 4 exchanges heat in water 9 to generate ice crystals 10, and then the refrigerant 4 heavier than the water 9 is cooled in the bottom 3 of the ice making tank.
Then, the circulation is performed by cooling the refrigerator 5 again via the refrigerant pipe 7.

The ice crystals 10 gather in the upper portion of the ice making tank 1 by buoyancy, pass through the flow path 15, and flow into the water storage tank 2. Water tank 2
The water 9 returned from the water is supplied to the lower portion 3 of the ice making tank 1 through the water pipe 12 to generate a flow of the water 9, and the refrigerant 4 never flows into the water storage tank 2.

Further, as shown in FIG. 2, when the water nozzle 17 of the water jacket 16 is arranged on the outer periphery of the radius of 100 mm to 300 mm from the position of the refrigerant nozzle 8 and the water 9 is supplied, heat exchange with the refrigerant 4 is promoted. ..

The water 9 is jetted from the water nozzle 17 of the water jacket 16 at a right angle to the jet of the coolant 4 or at an angle of 45 degrees to form a circulating flow in the ice making tank 1. The heat exchange of can be promoted.

4 refrigerants that have exchanged heat with water 9 are water jackets
When falling onto the outer periphery of the water jacket 16, 300 mm to 6 mm from the outer circumference of the water jacket 16 to prevent four refrigerants from adhering to the inner wall of the ice making tank 1.
It is good to have a distance of 00 mm.

The heat exchange efficiency is promoted by the circulation flow of the refrigerant nozzle 8 and the circulation flow of the water nozzle 17, and the four refrigerants that have exchanged heat with the water 9 do not bond with the ice crystals 10. It will never be generated.

[0023]

As described above, according to the present invention, since the refrigerant is ejected from the refrigerant nozzle in the refrigerant liquid at the bottom of the ice making tank, the refrigerant nozzle is not in direct contact with water, so the refrigerant nozzle freezes. There is no problem, while ice crystals are efficiently generated by the circulation flow of the refrigerant nozzle and the circulation flow of the water nozzle,
It is possible to provide a safe and highly efficient ice heat storage device. Further, since the refrigerant can be directly introduced into the refrigerator, the efficiency of the ice heat storage device is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of main parts of an embodiment of an ice heat storage device of the present invention.

FIG. 2 is a main part configuration diagram showing an example of a refrigerant nozzle part of FIG.

[Explanation of symbols]

 1 ... Ice making tank 2 ... Water storage tank 4 ... Refrigerant 6 ... Refrigerator 8 ... Refrigerator nozzle 9 ... Water 10 ... Ice crystals 12 ... Water piping 15 ... Flow path 16 ... Water jacket 17 ... Water nozzle

Claims (2)

[Claims] 1. An ice making tank for storing a water-insoluble refrigerant having a specific weight of 1.5 times or more of water and a freezing point of −20 ° C. or lower, and the ice making tank for maintaining the refrigerant at 0 ° C. or lower. A coolant circulation path for circulating the inside, a water tank for inflowing and storing the ice crystals generated in the ice making tank, and connecting the water tank and the ice making tank to supply the water in the water tank to the ice making tank An ice heat storage device comprising: a water pipe; and a refrigerant nozzle which is provided in the ice making tank and ejects a refrigerant from a refrigerant layer in a lower portion of the ice making tank toward upper water. 2. A water jacket having a water nozzle for ejecting water at an angle of 45 degrees to the direction of the refrigerant jet from the refrigerant nozzle is provided at the tip of a water pipe connected to the ice making tank. The ice heat storage device according to claim 1, which is characterized in that.