JP2020085425A - Cooling system - Google Patents

Abstract

To provide a cooling system capable of finely adjusting to a desired temperature below the freezing point.SOLUTION: A cooling system includes: an ice slurry manufacturing part 1, an ice bath 2, and a flow passage 3. The ice slurry manufacturing part 1 manufactures sherbet-like ice slurry S including ice generated below the freezing point from a water solution containing solute, and a water solution which is the same as or different from the water solution containing solute. The ice slurry manufacturing part 1 includes a solute content change part 11 capable of changing the solute concentration of the water solution, and by changing the solidification point of the water solution containing solute, it changes the temperature of the ice slurry S. The ice bath 2 stores the ice slurry S. The flow passage 3 supplies the ice slurry S manufactured in the ice slurry manufacturing part 1 to the ice bath 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cooling system capable of adjusting a temperature below freezing.

Researches such as chemical experiments and physical experiments may require a temperature below freezing. Patent Document 1 describes a program freezer for freezing and thawing a biological sample below freezing. This program freezer freezes biological samples (samples) such as platelets and bone marrow, or foods while keeping the temperature gradient constant.

This program freezer comprises a chamber, a temperature detecting means, an input means, a cooling means, a heating means, and a temperature control means. The temperature detecting means detects the temperature of the sample contained in the chamber. The input means inputs a temperature gradient at the time of freezing and thawing the sample. The cooling means supplies liquid nitrogen into the chamber to lower the temperature inside the chamber. The heating means is a heater that raises the temperature in the chamber and is controlled by the heater controller. The temperature control means controls the cooling means and the heating means.

The temperature control means calculates a temperature gradient from the temperature of the sample obtained from the temperature detection means, compares the temperature gradient with the temperature gradient obtained from the input means, and heats the cooling means and the heating means so that they coincide with each other. Control means and. The temperature control means increases or decreases the supply amount of liquid nitrogen to control the heater controller. The temperature control means, for example, once cools the sample from room temperature to 5° C. at a temperature gradient of −3° C./min, holds it at this temperature for 10 minutes, and then, at a temperature gradient of −1° C./min up to −80° C. to freeze.

Japanese Patent Publication No. 60-59501

The chamber described in Patent Document 1 is supplied with liquid nitrogen and its temperature is controlled, so that it is required to have performance such as airtightness and heat insulation. However, such a chamber is large-scale, and it cannot be said that it is suitable for use in research such as chemical experiments and physical experiments.

Further, in the program freezer described in Patent Document 1, in order to control the temperature inside the chamber, the temperature inside the chamber is lowered by liquid nitrogen, while the temperature is raised by a heater. Therefore, it is difficult for this program freezer not only to cause energy loss but also to control the temperature finely and quickly.

An object of the present invention is to provide a cooling system capable of finely adjusting a desired temperature below freezing.

The cooling system according to the present invention is
Ice generated below the freezing point from a solute-containing aqueous solution, and an ice-slurry production section for producing a sherbet-like ice slurry containing the same or a different aqueous solution as the solute-containing aqueous solution,
An ice bath for storing the ice slurry,
A channel for supplying the ice slurry produced by the ice slurry producing section to the ice bath;
Equipped with
The ice-slurry manufacturing unit includes a solute-content changing unit that can change the solute concentration of the solute-containing aqueous solution, and changes the temperature of the ice slurry by changing the freezing point of the solute-containing aqueous solution.

The ice is
(A) The temperature at the time of completion of melting is less than 0° C. (b) The change rate of the solute concentration of the solute-containing aqueous solution generated from ice during the melting process is within 30%.

The cooling system according to the present invention may further include a heat conductive plate disposed on an upper surface of the ice slurry stored in the ice bath.
The ice bath includes a discharge port for discharging the stored ice slurry.
The cooling system according to the present invention may further include a return path for returning the ice slurry stored in the ice bath to the ice slurry producing unit.

According to the present invention, it is possible to provide a cooling system capable of finely adjusting to a desired temperature below freezing.

It is a conceptual diagram which shows 1st Embodiment of the cooling system of this invention. It is a conceptual diagram which shows the 2nd Embodiment of the cooling system of this invention. It is a conceptual diagram which shows 3rd Embodiment of the cooling system of this invention. It is a conceptual diagram which shows the 4th Embodiment of the cooling system of this invention.

A first embodiment of the cooling system of the present invention will be described with reference to FIG. FIG. 1 is a conceptual diagram showing a first embodiment of the cooling system of the present invention.

First, the outline of the cooling system of the first embodiment will be described. This cooling system is used to cool the sample A in, for example, a chemical experiment or a physical experiment. As shown in FIG. 1, the cooling system includes an ice slurry production unit 1, an ice bath 2, and a flow path 3.

The ice slurry production unit 1 produces a sherbet-shaped ice slurry S. The ice slurry S contains ice generated below the freezing point from the solute-containing aqueous solution and an aqueous solution which is the same as or different from the solute-containing aqueous solution. The ice slurry production unit 1 includes a solute content rate changing unit 11 capable of changing the content rate of the solute in the solute-containing aqueous solution. The solute content rate changing unit 11 can change the temperature of the ice slurry S by changing the solute content rate to change the freezing point of the solute-containing aqueous solution.

The ice bath 2 is a container having an upper surface opening for storing the ice slurry S. The ice bath 2 has a heat insulating property so that the stored ice slurry S is not melted by the outside air. The ice bath 2 may have a double structure with an air layer interposed. Depending on the size of the sample A, the ice bath 2 is provided in various sizes from a small size installed on a table to a large size installed in the experimental building. The flow path 3 is a passage for flowing the ice slurry S manufactured by the ice slurry manufacturing unit 1 into the ice bath 2. The flow path 3 is, for example, a pipe having a heat insulating property. Therefore, the ice bath 2 is formed with a through hole (not numbered) for the pipe.

Hereinafter, the ice slurry manufacturing unit 1 will be described in detail. Although not shown, the ice slurry manufacturing unit 1 includes a flake ice manufacturing device and an ice storage tank. The flake ice production apparatus produces hybrid ice from a liquid containing an aqueous solution containing a solute (hereinafter referred to as "brine"), and produces flake ice from the hybrid ice. In the ice storage tank, flake ice and brine are mixed at a predetermined ratio to produce the ice slurry S.

Brine is an aqueous solution containing a solute in a solvent such as water, for example, an aqueous solution of sodium chloride (salt water), an aqueous solution of calcium chloride, an aqueous solution of magnesium chloride, an aqueous solution of ethylene glycol, etc., and has a feature of having a low freezing point. Have Hybrid ice is instantly frozen ice that has not been given time to separate the solute and solvent in the brine. In the present invention, “ice” is hybrid ice or flake ice produced by a flake ice production device.

Ice is liquid ice containing a solute-containing aqueous solution that satisfies the following conditions (a) and (b).
(A) The temperature at the time of completion of melting is less than 0° C. (b) The change rate of the solute concentration of the solute-containing aqueous solution generated from ice during the melting process is within 30%

The condition (a) will be described. Since ice is produced from a solute-containing aqueous solution, its freezing point is lower than that of fresh water containing no solute. Therefore, ice has a characteristic that the temperature at the completion of melting is less than 0°C. "Temperature at the completion of melting" means that the ice generated by the flake ice making device is placed in an environment above the melting point (for example, room temperature and atmospheric pressure) to start melting the ice and all the ice melts. It refers to the temperature of the water when it becomes water. The temperature at the time of completion of melting is not particularly limited as long as it is less than 0°C, and can be appropriately changed by adjusting the type and concentration of the solute.

The condition (b) will be described. Since the ice produced by the flake ice production apparatus is made of liquid ice containing a solute-containing aqueous solution, it has a characteristic that the elution rate of the solute during the melting process is small. Specifically, the rate of change in the solute concentration of the solute-containing aqueous solution generated from ice during the melting process is 30%. "The rate of change of the solute concentration in the solute-containing aqueous solution generated from ice during the melting process" is the ratio of the concentration of the solute-containing aqueous solution at the completion of melting to the solute concentration in the solute-containing aqueous solution generated at any point during the melting process. Means "Solute concentration" means the concentration of the mass of solute in the solute-containing aqueous solution.

The change rate of the solute concentration in the ice produced by the flake ice manufacturing apparatus is not particularly limited as long as it is within 30%. However, from the viewpoint that the smaller the rate of change is, the higher the ice purity of the solute-containing aqueous solution having a lowered freezing point, that is, the higher the cooling capacity, the rate of change of the solute concentration is within 25%. May be.

The type of solute contained in the ice produced by the flake ice manufacturing apparatus is not particularly limited as long as it is a solute when water is used as a solvent, and is appropriately selected according to a desired freezing point, use of ice to be used, and the like. be able to. Examples of solutes include solid solutes and liquid solutes, and typical solid solutes include salts (inorganic salts, organic salts, etc.). Particularly, among salts, sodium chloride (NaCl) does not excessively lower the freezing point temperature. In addition, salt is contained in seawater, which is easy to procure. Examples of liquid solutes include ethylene glycol and the like. The solute may be contained alone or in combination of two or more.

The liquid constituting the ice produced by the flake ice manufacturing apparatus may be a liquid containing oil in addition to the solute-containing aqueous solution. Examples of such a liquid include raw milk, industrial wastes containing water and oil (waste milk, etc.). When the liquid is raw milk, it is preferable in that the organoleptic properties of the milk when it is eaten are improved. As described above, it is speculated that the reason why the organoleptic property is improved is that the oil (fat) contained in the raw milk is trapped in ice. The ice produced by the flake ice manufacturing apparatus may be composed only of the frozen solute-containing aqueous solution.

Further, the ice produced by the flake ice manufacturing apparatus may be ice of an aqueous solution containing two or more solutes having different freezing point depression degrees. In this case, the ice produced by the flake ice manufacturing apparatus may be a mixture of ice of one solute-containing aqueous solution and ice of the other solute-containing aqueous solution. In this case, for example, by adding ice of an aqueous solution containing sodium chloride as a solute having a different freezing point depression to ethylene glycol to ice of an aqueous solution containing ethylene glycol as a solute, it is possible to delay the melting of the ice in the aqueous solution containing ethylene glycol. it can.

Alternatively, the ice generated by the flake ice manufacturing apparatus may be ice of an aqueous solution obtained by dissolving two or more solutes in the same aqueous solution. It is also useful when two or more solutes having different freezing point depression degrees are used in combination, and when the melting point of ice of an aqueous solution containing the target solute is lowered. For example, when salt is used as a solute, the melting point of ice in saline can be lowered by using a solute capable of further lowering the melting point than that of sodium chloride (ethylene glycol, calcium chloride, etc.). It is possible to achieve temperatures around -30°C, which cannot be achieved with ice alone. The ratio of two or more solutes having different freezing point depression degrees can be appropriately changed depending on the purpose.

In addition, the ice produced by the flake ice manufacturing apparatus is kept stable at a temperature equal to or lower than the freezing point of fresh water, that is, the non-separated state can be maintained for a long time. Therefore, if the liquid that makes up the ice produced by the flake ice making device is a liquid that contains oil in addition to the solute-containing aqueous solution described above, the oil will last for a long time in a uniform state, that is, will not separate. The condition can be maintained for a long time.

The concentration of the solute contained in the ice produced by the flake ice manufacturing apparatus is not particularly limited, and can be appropriately selected depending on the type of the solute, the desired freezing point, the intended use of the ice used, and the like. For example, when salt is used as the solute, the concentration of the salt is 0.5% (w/v) or more in that the freezing point of the solute-containing aqueous solution can be further lowered and a high cooling capacity can be obtained. preferable.

When the liquid that composes the ice produced by the flake ice making device further contains oil, the ratio of water to oil in the liquid is not particularly limited, and is appropriately selected within the range of 1:99 to 99:1, for example. You may.

Here, the outline of the flake ice manufacturing apparatus will be described. Although not shown, the flake ice making device includes an ice making unit that rapidly freezes brine to produce thin ice-like hybrid ice, an injection unit that pours brine to the ice making unit, and a thin ice-like hybrid ice making unit. And a blade for scraping it off.

The ice making unit may be in the form of a cylindrical vertical drum or a plate in a vertical posture. The temperature of the inner peripheral surface of the vertical drum and the surface of the plate is cooled to -20°C to -25°C. Copper or a copper alloy having high thermal conductivity is adopted as a member forming the vertical drum or the plate. The surface of the vertical drum and the metal plate is plated with wear-resistant metal such as chrome.

The spraying unit intermittently sprays the brine to the ice making unit. Brine is instantaneously produced in hybrid ice in the ice making section. Flake ice is produced by the blade scraping the ice off the ice making section. The flake ice falls into the ice storage tank located just below the ice making section. The hybrid ice and the flake ice are collectively referred to as “ice” hereinafter.

The brine stored in the brine storage tank is also supplied to the ice storage tank. In the ice storage tank, the flake ice manufactured by the flake ice manufacturing device and the brine supplied from the brine storage tank are mixed at a predetermined ratio. In this way, the sherbet-shaped ice slurry S is manufactured in the ice storage tank.

The ice slurry S containing ice produced by the flake ice manufacturing apparatus may contain other components of the above-mentioned ice. For example, by containing water in addition to the above-mentioned ice, the ice-slurry S is made of a mixture of ice and water. You may. For example, when the water further contains the same solute as the solute contained in ice, the concentration of the solute in ice and the concentration of the solute in water are preferably close to each other. The reason is as follows.

When the solute concentration of ice is higher than the solute concentration of water, the temperature of the ice is lower than the saturation freezing point of water, so that the water freezes immediately after mixing water with a low solute concentration. On the other hand, when the solute concentration of ice is lower than the solute concentration of water, the saturation freezing point of water is lower than the saturation freezing point of ice, so that the ice is melted and the temperature of the ice slurry S made of a mixture of ice and water is increased. descend. That is, in order to prevent the state of the mixture of ice and water (the state of the ice slurry S) from fluctuating, it is preferable that the solute concentrations of ice and water to be mixed are approximately the same as described above. Further, in the case of a mixture of ice and water, the water may be one in which the ice is melted or may be prepared separately, but one in which the ice is melted Is preferred.

Specifically, when the ice slurry S containing ice produced by the flake ice manufacturing apparatus is composed of a mixture of ice and water, the ratio of the concentration of solute in ice and the concentration of solute in water is 75. :25 to 20:80 is more preferable, and 50:50 is the most preferable. In particular, when using sodium chloride as the solute, it is preferable that the ratio of the concentration of the solute in ice to the concentration of the solute in water is within the above range. When the ice slurry S is produced from ice obtained by freezing salt water, the salt concentration is set to 13.6 to 23.1%.

The ice slurry S containing ice produced by the flake ice production apparatus preferably further contains a solid having a higher thermal conductivity than the ice produced by the above flake ice production apparatus. However, since the ice produced by the flake ice manufacturing apparatus has a high cooling capacity as described above, it is useful in that it is possible to cool for a long time while obtaining a cooling capacity for a short time by a solid having high thermal conductivity. Is.

Examples of solids having a higher thermal conductivity than ice produced by the flake ice manufacturing apparatus include metals (aluminum, silver, copper, gold, duralumin, antimony, cadmium, zinc, tin, bismuth, tungsten, titanium, iron, Lead, nickel, platinum, magnesium, molybdenum, zirconium, beryllium, indium, niobium, chromium, cobalt, iridium, palladium), alloys (steel (carbon steel, chrome steel, nickel steel, chrome nickel steel, silicon steel, tungsten steel, Manganese steel, etc.), nickel chrome alloy, aluminum bronze, gunmetal, brass, manganin, nickel silver, constantan, solder, alumel, chromel, monel metal, platinum iridium, etc.), silicon, carbon, ceramics (alumina ceramics, forsterite ceramics, steatite) Ceramics, etc.), marble, bricks (magnesia bricks, Korhalt bricks, etc.), and the like, which have higher thermal conductivity than ice produced by the flake ice manufacturing apparatus.

Further, the solid having a higher thermal conductivity than ice produced by the flake ice manufacturing apparatus is more preferably a solid having a thermal conductivity of 2.3 W/m K or more, and a thermal conductivity of 50 W/m K or more. ) Is more preferable, the solid having a thermal conductivity of 100 W/m K or higher is even more preferable, and the solid having a thermal conductivity of 200 W/m K or higher is still more preferable. Is more preferably 200 W/m K or more, and particularly preferably a solid having a thermal conductivity of 400 W/m K or more.

When the ice slurry S containing ice produced by the flake ice manufacturing apparatus contains a solid having a higher thermal conductivity than the above-mentioned ice, as described above, it is suitable for cooling for a long time even if it contains many solids. , For example, the mass of the solid having a higher thermal conductivity than the ice produced by the flake ice making device/the ice mass contained in the ice slurry S (or the present invention contained in the ice slurry S. The total mass of the ice and the liquid containing the solute-containing aqueous solution) may be 1/100000 or more.

The solid contained in the ice slurry S containing ice produced by the flake ice manufacturing apparatus may have any shape, but is preferably in the form of particles. The solid may be contained in the ice produced by the flake ice manufacturing apparatus in a form contained in the ice, or may be contained in a form contained in the outside of the ice. Since it is easier to directly contact the object to be cooled when it is included in the form included in, the cooling capacity becomes higher. For this reason, it is preferable that it is contained in a form contained outside the ice.

When the ice slurry S containing ice produced by the flake ice production apparatus contains the above solid, it may be mixed with the above solid after producing ice by the flake ice production apparatus, or it may be a raw material in advance. Ice may be produced by a flake ice making device in a state of being mixed with water.

Here, a method of using the cooling system of the first embodiment will be described. As shown in FIG. 1, the ice slurry S manufactured by the ice slurry manufacturing unit 1 flows into the ice bath 2 through the flow path 3. The ice slurry S produced by the ice slurry producing unit 1 has a solute content changing unit 11 that changes the concentration of a solute such as sodium chloride or uses a solute such as ethylene glycol together, so If so, it is cooled to a predetermined temperature that is finely adjusted.

The ice slurry S having a predetermined temperature is stored in the ice bath 2. The sample A is tested by immersing the sample A in the ice slurry S. When another sample A is tested, the solute content changing unit 11 stores the ice slurry S manufactured at a temperature suitable for the test in the ice bath 2. Therefore, in this cooling system, the ice slurry S whose temperature is finely adjusted is stored in the ice bath 2, so that the sample A can be accurately tested.

Next, a second embodiment of the cooling system will be described with reference to FIG. FIG. 2 is a conceptual diagram showing a second embodiment of the cooling system of the present invention. In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and will not be described again.

The cooling system of the second embodiment further includes a heat conductive plate (hereinafter, mainly referred to as “plate”) 4 in the cooling system of the first embodiment. The plate 4 is put into the ice bath 2 through the opening on the upper side of the ice bath 2 and arranged on the upper surface of the ice slurry S stored in the ice bath 2. Since the plate 4 has thermal conductivity, the temperature of the ice slurry S is transferred to the surface of the plate 4. The plate 4 is formed of a metal having a large thermal conductivity, such as copper, copper alloy, or silver. Since the plate 4 shields the ice slurry S stored in the ice bath 2 from the outside air, it acts like a heat insulating material and prevents the ice slurry S from rising in temperature.

The plate 4 includes a main body portion 41 that contacts the upper surface of the ice slurry S, and an edge portion 42 that projects upward at the outer peripheral edge of the main body portion 41. The outer diameter of the plate 4 (when the plate 4 is a disk) is the inner diameter of the ice bath 2 (the ice bath 2 has a bottomed tubular shape) so that the plate 4 can be easily inserted into the ice bath 2 from the upper opening of the ice bath 2. In case of) will be slightly smaller than. The body portion 41 of the plate 4 may have a plate shape or a net shape. The plate 4 may float on the upper surface of the ice slurry S, may be supported by a plurality of columns (not shown) provided upright from the bottom surface of the ice bath 2, or the inside of the ice bath 2 may be supported. It may be supported on a collar portion (not shown) provided on the circumferential surface. Further, the body portion 41 of the plate 4 is provided with the hollow portion so as to have buoyancy, so that even if the specific gravity is larger than that of the ice slurry S, it can be floated on the upper surface of the ice slurry S.

Also in the cooling system of the second embodiment, by changing the freezing point of the solute-containing aqueous solution by the ice slurry producing unit 1, the ice slurry S finely adjusted and produced at a predetermined temperature is stored in the ice bath 2. It The plate 4 is placed on the upper surface of the ice slurry S. The plate 4 floats on the upper surface of the ice slurry S and is cooled to the same or almost the same temperature as the ice slurry S. The sample A is placed on the plate 4. The sample A is cooled by the ice slurry S via the plate 4. Even if the sample A is small and has a rolling shape, it does not fall into the ice slurry S due to the edge portion 42.

Next, a third embodiment of the cooling system will be described with reference to FIG. FIG. 3 is a conceptual diagram showing a third embodiment of the cooling system of the present invention. In the third embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and will not be described again.

The cooling system of the third embodiment is provided with at least one of the discharge port 5 and the return path 6 in the cooling system of the first embodiment. The discharge port 5 is a pipe attached to the bottom side of the ice bath 2. An on-off valve (not shown) for discharging the ice slurry S in the ice bath 2 only when necessary is attached in the middle of the return path 6.

The return path 6 is a pipe for returning the ice slurry S stored in the ice bath 2 to the ice slurry manufacturing unit 1. An on-off valve (not shown) for returning the ice slurry S in the ice bath 2 to the ice slurry producing section 1 only when necessary is attached in the middle of the return path 6. The return path 6 may be connected not only to the upper side of the ice bath 2 as shown, but also to the bottom side.

In the cooling system according to the third embodiment, when the ice slurry S stored in the ice bath 2 is contaminated with, for example, the sample A, the ice slurry S is discharged from the discharge port 5. Alternatively, when it is desired to raise or lower the temperature of the ice slurry S stored in the ice bath 2 in a short time, the ice slurry S stored in the ice bath 2 is discharged from the discharge port 5 to change the freezing point of the solute-containing aqueous solution. By doing so, the ice slurry S having a new predetermined temperature is introduced from the ice slurry manufacturing unit 1.

When the ice slurry S stored in the ice bath 2 is not contaminated and it is desired to raise or lower the temperature over time, the ice slurry S stored in the ice bath 2 is returned from the return path 6 to the ice slurry producing unit 1. The ice slurry producing section 1 produces the ice slurry S at a predetermined temperature and flows it into the ice bath 2 from the flow path 3. Therefore, the ice slurry S circulates reusably.

Note that the plate 4 may be provided as in the third embodiment or the second embodiment.

Next, a fourth embodiment of the cooling system will be described with reference to FIG. FIG. 4 is a conceptual diagram showing a fourth embodiment of the cooling system of the present invention. In the fourth embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and will not be described again.

The cooling system according to the fourth embodiment includes a solute content rate changing unit 11 provided separately from the main body (not numbered) of the ice slurry producing unit 1, the solute content rate changing unit 11, and the ice slurry production. It is provided with a flow path 7 such as a pipe that communicates with the main body of the unit 1.

The solute content rate changing unit 11 is a cartridge that stores a solute of a solute-containing aqueous solution (brine) at a predetermined concentration. For example, when the solute content changing unit 11 stores the calcium chloride aqueous solution (30% aqueous solution), the flake ice manufacturing apparatus manufactures the flake ice at -55°C. When the solute content changing unit 11 stores the ethylene glycol aqueous solution (70% aqueous solution), the flake ice manufacturing apparatus manufactures -60° flake ice. By changing the freezing point of the solute-containing aqueous solution by exchanging the solute-content changing section 11 in which the concentration of the solute-containing aqueous solution is different and further combining a plurality of solute-containing rate changing sections 11 in the form of a cartridge. The ice slurry S finely set to a desired temperature can be easily stored in the ice bath 2.

Also in the cooling system of the fourth embodiment, the sample A is cooled by the ice slurry S stored in the ice bath 2. The cooling system of the fourth embodiment may also include the plate 4 described in the second embodiment, or the cooling system of the third embodiment. At least one of the discharge port 5 and the return path 6 may be provided.

Although the first to fourth embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above-described embodiments, and the matters described in the claims are not limited thereto. It also includes other embodiments and modifications that are conceivable within the scope. Further, various modifications and combinations of the above embodiments may be made without departing from the scope of the present invention.

The flow path 3 of the first to fourth embodiments is a pipe connected to the ice bath 2. However, the flow path 3 may be in the shape of a tube or a trough that is injected from the upper surface of the ice bath 2. In this case, the ice bath 2 can be easily separated from the ice slurry producing section 1 and installed in a different laboratory or the like.

The case of one ice bath 2 in the first to fourth embodiments has been described. However, multiple ice baths 2 may be provided. In this case, the ice baths 2 may store the ice slurries S at different temperatures from the ice slurry manufacturing unit 1, or may store the ice slurries S at the same temperature.

In summary, the cooling system to which the present invention is applied is
An ice slurry producing section 1 for producing a sherbet-like ice slurry containing ice generated below the freezing point from a solute-containing aqueous solution and an aqueous solution which is the same as or different from the solute-containing aqueous solution,
An ice bath 2 for storing the ice slurry S,
A channel 3 for supplying the ice slurry S manufactured by the ice slurry manufacturing unit 1 to the ice bath 2;
Equipped with
The ice slurry production unit 1 includes a solute content rate changing unit 11 capable of changing the solute concentration of the solute-containing aqueous solution, and changes the temperature of the ice slurry S by changing the freezing point of the solute-containing aqueous solution.

In this cooling system, the ice slurry manufacturing unit 1 includes a solute content rate changing unit 11 capable of changing the solute concentration of the aqueous solution, and by changing the temperature of the ice slurry S, it is cooled to a predetermined temperature, in other words. The finely adjusted ice slurry S can be stored in the ice bath 2. The cooling system can experiment with sample A using ice slurry S.

The ice is
(A) The temperature at the time of completion of melting is less than 0° C. (b) The change rate of the solute concentration of the solute-containing aqueous solution generated from ice during the melting process is within 30%.

This cooling system can produce ice containing an aqueous solution whose freezing point is lowered by satisfying both conditions (a) and (b) above.

The heat conductive plate 4 is further provided on the upper surface of the ice slurry S stored in the ice bath 2.
This cooling system can be tested by placing sample A on plate 4.

The ice bath 2 has a discharge port 5 for discharging the stored ice slurry S.
This cooling system can discharge the ice slurry S from the discharge port 5 provided in the ice bath 2 so that the new ice slurry S can be easily stored in the ice bath 2.

A return path 6 for returning the ice slurry S stored in the ice bath 2 to the ice slurry producing unit 1 is further provided.
In this cooling system, the ice slurry S stored in the ice bath 2 is returned to the ice slurry manufacturing unit 1 by the bag, so that the ice slurry S can be circulated and reused.

1……Ice slurry manufacturing department 2……Ice bath 3……Flow path 4……Plate 5……Discharge port 6……Return path A……Sample S……Ice slurry

Claims (5)

Ice generated below the freezing point from a solute-containing aqueous solution, and an ice-slurry production section for producing a sherbet-like ice slurry containing the same or a different aqueous solution as the solute-containing aqueous solution,
An ice bath for storing the ice slurry,
A channel for supplying the ice slurry produced by the ice slurry producing section to the ice bath;
Equipped with
The ice slurry manufacturing unit includes a solute content changing unit that can change the solute concentration of the solute-containing aqueous solution, and changes the temperature of the ice slurry by changing the freezing point of the solute-containing aqueous solution,
Cooling system. The ice is
(A) the temperature at the time of completion of melting is less than 0° C. (b) the change rate of the solute concentration of the solute-containing aqueous solution generated from ice during the melting process is within 30%, both conditions are satisfied,
The cooling system according to claim 1. Further comprising a heat conductive plate disposed on an upper surface of the ice slurry stored in the ice bath,
The cooling system according to claim 1 or 2. The ice bath includes a discharge port for discharging the stored ice slurry,
The cooling system according to any one of claims 1 to 3. Further comprising a return path for returning the ice slurry stored in the ice bath to the ice slurry producing section,
The cooling system according to any one of claims 1 to 4.

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