JPH074800A - Heat pipe type supercooling ice making equipment - Google Patents

Abstract

PURPOSE:To make it possible to make ice continuously and stably by producing supercooled water by using a heat pipe. CONSTITUTION:A heat pipe 1 is used as a heat exchanger and a jacket 3 so designed as to circulate and supply a refrigerant from a refrigerator 10 is provided on the upper part of this heat pipe 1, while a heater 4 is provided on the lower part thereof. Moreover, a resin tube 2 of a necessary length is wound like a coil on the central part of the heat pipe 1 so that it is in close contact with the pipe. Between this coil-shaped resin tube 2 and an ice heat storage tank 5, a circulation circuit for water to be cooled is formed. In the ice heat storage tank 5, a supercooled water destructing plate 8 is set at a position at which supercooled water discharged from the resin tube 5 drops. According to this constitution, it is possible to produce stable supercooled water and to make ice continuously with increased heat exchanger effectiveness and stably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe type subcooling ice making apparatus for producing supercooled water by using a heat pipe so as to continuously and stably make ice.

[0002]

2. Description of the Related Art Conventionally, as an ice making technique in an ice heat storage system, a refrigerant such as brine is circulated in a coiled thin tube installed in water to form and grow solid ice on the outer surface of the coiled thin tube. Solid ice method (ice-on-coil type) and fluid supercooled water are used, and shock or other means for destroying supercooling phenomenon is used to continuously crystallize this in water according to temperature. There is a supercooled ice making method for producing ice cream in the form of sherbet.

[0003]

In the solid ice making method, when ice grows around a coiled thin tube, the ice adhering to this thin tube acts as a heat insulating material, and the refrigerating capacity and efficiency of the refrigerator deteriorate. To do. This causes energy loss. In addition, the supercooled ice making method has been attracting attention in recent years as a system that has less influence on the performance and efficiency of a refrigerator than the solid ice making method.
As an example of this method, a spiral metal pipe is wound inside a shell-shaped hollow body, and a refrigerant supercooled to 0 ° C. or less by a refrigerator or brine is caused to flow through the shell-shaped hollow body, and then the coil tube is covered. The cooling water is passed through the cooling water to flow inside the shell-shaped hollow body, or the cold water of brine is used to bring the water to be cooled into a supercooled state to make ice. Therefore, there is an advantage that the structure does not require precision processing, the coil tube has high strength, and there is little risk of refrigerant leakage. However, the heat transfer efficiency is low, and a large heat transfer area cannot be obtained compared to the external dimensions. Therefore, to obtain a large amount of ice, it is necessary to install a large number of heat exchangers. Furthermore, the supercooling phenomenon is an extremely unstable physical phenomenon, and it always tries to move to a stable ice phase by some kind of destructive action, which causes this subcooling destruction to occur in the circulation system of the supercooled water, especially in the heat exchanger. ,
When ice occurs, the circulation system becomes blocked, making continuous ice making difficult.

In the supercooled ice making method of the present invention, a heat pipe and a resin tube are used as a heat exchanger, whereby stable supercooled water is produced, and the heat exchange rate is continuously and continuously increased to stably produce ice. The purpose is to do.

[0005]

The present invention has been made to achieve the above object, and uses a heat pipe as a heat exchanger, and circulates and supplies a refrigerant from a refrigerator to the upper portion of the heat pipe. The jacket is equipped with a heater at the bottom, and a resin tube of the required length is tightly wound around the center of the heat pipe in a coil shape, and a circulation circuit for the water to be cooled is provided between the coil resin tube and the ice heat storage tank. The supercooled water destruction plate is formed in the ice heat storage tank and at the position where the supercooled water discharged from the resin tube falls. Then, to this supercooled water destruction plate, a part of the refrigerant is supplied from the refrigerant circulation circuit so that the refrigerant from the refrigerator is circulated between the jackets provided on the upper part of the refrigerator and the heat pipe to destroy the supercooled water. The gist is that the plate is cooled and the supercooled water discharged from the resin tube is efficiently frozen.

[0006]

A heat pipe and a resin tube are used in the heat exchanger, and a cooling medium is circulated in the jacket attached to the upper part of the heat pipe by about -10 g to cool the heat pipe. Wrap it in a spiral shape so that it closely adheres to the
Since water is circulated at a temperature of 1 to 1 degree, by cooling the upper part of the heat pipe, the water inside the resin tube tightly wound around it is cooled, and it becomes supercooled water of about -2 degrees Celsius and becomes ice. Water is sent to the heat storage tank. The ice heat storage tank and the coil-shaped resin tube constitute a circulation circuit of the water to be cooled, and when the supercooled water returns from the resin tube to the tank, a supercooling destruction plate is provided on the water surface of the tank. The supercooled water is surely destroyed by this supercooled destruction plate to become water at 0 degrees Celsius, and then returns into the tank. At this time, ice can be crystallized in the tank according to the degree of supercooling. Moreover, since a part of the refrigerant sent from the refrigerator to the jacket provided on the heat pipe from the refrigerator to the subcooling destruction plate is circulated and cooled, and ice or frost grows on the surface, This becomes ice-forming nuclei, and supercooling destruction occurs immediately before the supercooled water returns to the inside of the tank, and ice crystallizes. Furthermore, since a heater is provided at the bottom of the heat pipe, when the ice due to supercooled water crystallizes in the coiled resin tube and blockage occurs, the heater is operated to heat the heat pipe. , Melt the ice crystallized in the coiled resin tube,
The blockage can be released early and stable ice production can be performed again.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat pipe type subcooling ice making apparatus of the present invention will be described below with reference to the illustrated embodiments. In the figure, 1 is a heat pipe which is one of the main elements constituting a heat exchanger, and has a required diameter and length according to the ice making capacity. A jacket 3 is provided above the heat pipe 1 and a heat pipe 1 is provided at the center thereof. The resin tube 2 is closely wound in a coil shape, and a heater 4 is attached to the lower part.

The resin tube is a synthetic resin pipe having a required diameter, which is wound around the center of the heat pipe 1 in a spiral shape over a length of the required diameter. Either make the resin tube heat-shrink so that it adheres to the outer peripheral surface of the heat pipe, or make it adhere to the heat pipe from the first winding, thereby improving heat transfer between the heat pipe surface and the resin tube surface. Eggplant

The resin tube 2 may be wound around the outer peripheral surface of the heat pipe by a single winding so that the spiral tubes are tightly adhered to each other as shown in the drawing, or by a double winding, and the development length of the wound resin tube is required to be supercooled. The ice-making capacity can be freely designed by appropriately setting it according to the temperature. Therefore, if the tube length is increased or the number of windings is increased, the ice making capacity will inevitably improve.

An ice heat storage tank 5 having a required volume is installed near or adjacent to the heat exchanger composed of the heat pipe 1 and the coil-shaped resin tube 2 as described above, and the inside of this tank and the coil-shaped resin tube are installed. The lower part of the pipe, the upper part of the tank and the upper part of the coiled resin tube respectively.
1, 22 to connect the ice heat storage tank 5 and the coil-shaped resin tube 2 to a circulating circuit of the water to be cooled, and a pipe 21 or 22 is provided with a circulating pump 6 and an on-off valve 7. . Then, the tip of the upper pipe 21 is opened at the upper portion in the ice heat storage tank.

In the ice heat storage tank 5, a subcooling water destruction plate 8 is preferably installed at the water surface position thereof and the jacket 3
A refrigerant supply pipe 9 for supplying a part of the refrigerant to be supplied to is connected, and thereby the supercooling water destruction plate 8 is always cooled to a predetermined temperature, and the supercooling water returned to the tank via the pipe 21 is destroyed. And then let the ice crystallize out.

A refrigerator 10 and a refrigerant circulation circuit 11 for circulating a refrigerant are connected to the jacket 3, and the refrigerant circulation circuit 11 is branched to connect the refrigerant supply pipe 9.

The heater 4 attached to the lower part of the heat pipe 1 prevents the supercooled water from crystallizing and blocking the ice in the coil-shaped resin tube wound around the outer periphery of the heat pipe, that is, freezing in the resin tube. The electric heater, steam, and hot gas of the refrigerator are used. The heater is heated in the coiled resin tube when the supercooled water becomes frozen.

Therefore, the operation of the supercooled ice making device having the above-described structure will be described below. The pump 6 provided in the circuit for circulating the water to be cooled is operated to take out the water to be cooled from the bottom of the inside of the ice heat storage tank, and the water is fed into the coil-shaped resin tube wound around the outer periphery of the heat pipe, from the tip of the pipe 21 into the tank. Discharge and circulate the water in the ice heat storage tank with the coiled resin tube. Then, when the flow rate of the circulation circuit becomes a steady state by the operation of the pump, the refrigerant from the refrigerator 10 is circulated through the refrigerant circuit 11 into the jacket 3 above the heat pipe to be supplied. The upper part of is cooled via the jacket 3.

The heat pipe 1 whose upper part is cooled removes heat from the water to be cooled flowing in the heat pipe 1 through the resin tube wound around the center thereof, and evaporates the working liquid in the heat pipe. The gas of the working fluid is condensed through the cold heat of the jacket above the heat pipe and flows down along the tube wall. In this way, the working liquid in the heat pipe circulates in the upper and lower parts of the heat pipe, and the temperature of the water to be cooled in the resin tube cooled by the heat pipe gradually decreases,
When the temperature becomes 0 ° C. or less, a part of the refrigerant is constantly circulated from the pipe 21 to be cooled and dropped onto the supercooled water destruction plate where ice or frost is formed. Crystallize. By circulating the water to be cooled in this way, stable supercooled water is obtained, and sherbet-like ice making is continuously and stably performed.

As an application of the present invention, firstly, there is an ice heat storage system for air conditioning of a building or the like. In the ice heat storage system, the ice heat storage tank 5 of the present invention is provided with a circulation pipe connected to the secondary side air conditioning equipment of the building and a chilled water pump, and ice is manufactured by the method of the above-mentioned embodiment at night using inexpensive late-night power. To do. The amount of ice that can be stored at night is 10
Instead of using 0% ice, the IPF (ice making rate) is adjusted to around 60% to contain some unfrozen water. Daytime,
The cold water pump is operated to take out approximately 0 ° C. of unfrozen water from the circulation pipe provided at the bottom of the ice heat storage tank 5 and send it to the air conditioner of the secondary side air conditioning equipment. Unfrozen water in the air conditioner exchanges heat with indoor air in a cold water coil and is blown into the building as cold air to cool the room.

On the other hand, the unfrozen water is heated to 12
The temperature is raised to 0 ° C. and returned to the inside of the ice storage tank 5 through a circulation pipe provided in the upper part of the ice storage tank 5, where the ice is melted to become 0 ° C. cold water and sent to the air conditioner. When the present invention is used in the ice heat storage system in this way, 1) Since ice can be efficiently produced with supercooled water, energy saving and low running cost performance can be obtained. 2) Since cold water from 0 ℃ to 12 ℃ can be used, the secondary side air conditioning equipment can be a highly energy-saving, low air flow, large temperature difference air conditioning system, and a high quality air conditioning environment for building users. Can be provided. 3) Nationally, it can contribute to the leveling of electricity,
In addition to the above advantages, the building owner has the advantage that the use of inexpensive late-night power can significantly reduce running costs.

The following method can be considered as other uses. ● Prevention and control of cracking due to temperature stress of concrete In mass concrete structures, temperature cracking easily occurs due to heat of hydration due to hydration reaction of cement.
To prevent or control temperature cracks, the method of lowering the casting temperature of concrete is the most efficient. Therefore, it is rational to use the ice produced in the present invention as the kneading water. In addition, cooling water at 0 ° C can be introduced into an aggregate tank or a cement silo using a circulation circuit like an ice heat storage system and the concrete material can be cooled in this to prevent temperature cracking. , Or effective in control.

Production of dairy products In a dairy production factory, a large amount of cold water is consumed. Therefore, a huge amount of money is required for constructing the cooling / heating equipment, and the running cost is also high. If the product of the present invention is connected to a manufacturing facility by using a circulation pipe, stable cold water of 0 ° C. can always be used, the quality of the product can be improved, and the running cost can be reduced by using the night power.

[Food Transport] It is also effective to reduce the transportation cost if the ice stored in the ice heat storage tank 5 is directly used as a coolant for transportation of fresh fish.

Production of Ice Dessert The ice produced in the present invention is in the form of a sherbet, and can be edible by placing it on a plate, seasoning it with molasses without shaving the ice with a shaved ice machine or the like.

[0022]

The heat pipe type subcooling ice making apparatus of the present invention uses a heat pipe as a heat exchanger, a jacket for circulating and supplying a refrigerant from a refrigerator to the upper portion of the heat pipe, and a heater to the lower portion. In addition, a resin tube of the required length is closely attached to the center of the heat pipe and wound into a coil, and a circulation circuit for the water to be cooled is formed between the coiled resin tube and the ice heat storage tank. In addition, since the subcooling water destruction plate is installed at the position where the supercooled water discharged from the resin tube falls, stable supercooled water can be produced, and this subcooled water is reliably destroyed on the water surface of the tank. There is an advantage that ice can be made stably and continuously.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a heat pipe type supercooling ice making device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat pipe 2 Coil-shaped resin tube 3 Jacket 4 Heater 5 Ice heat storage tank 6 Pump 8 Supercooling water destruction plate 10 Refrigerator

Claims (3)

[Claims] 1. A heat pipe is used as a heat exchanger, a jacket for circulating and supplying a refrigerant from a refrigerator is provided above the heat pipe, a heater is provided below the heat pipe, and a required length is provided at the center of the heat pipe. While closely winding the resin tube of the above in a coil shape and forming a circulation circuit of the water to be cooled between this coiled resin tube and the ice heat storage tank, the supercooled water discharged from the resin tube in the ice heat storage tank A heat pipe type subcooling ice making device in which a subcooling water destruction plate is installed at the falling position of. 2. A heat pipe is provided with a jacket adapted to circulate and supply a refrigerant from a refrigerator, a heater is provided under the heat pipe, and a resin tube of a required length is closely attached to the center of the heat pipe to form a coil. A heat pipe type subcooling ice making device, characterized in that a heat exchanger is formed by winding the heat exchanger, and the heat pipe exchanges heat with a fluid flowing through the coiled resin tube. 3. A resin tube having a required length, in which a jacket for circulating and supplying a refrigerant from a refrigerator is provided above the heat pipe, a heater is provided below the heat pipe, and a fluid for heat exchange is circulated in a central portion of the heat pipe. To form a heat exchanger by closely winding the coil with a supercooled water destruction plate in the ice storage tank and at the drop position of the supercooled water discharged from the resin tube. A part of the refrigerant is supplied from the refrigerant circulation circuit so that the refrigerant from the refrigerator is circulated between the refrigerator and the jacket and is constantly cooled to ensure ice crystallization of supercooled water. Heat pipe type subcooling ice making device characterized in that