JP2007046863A - Separation method of ice and ice heat storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To separate ice by generating bubbles from a surface of a wall surface with the ice generated thereon. <P>SOLUTION: An ice generation wall surface 2 is installed on the inside surface of a storage tank 1 for storing a fluid. Brine is run to the outer surface 9 of the ice generation wall surface in order to generate ice on the inside surface 8 of the ice generation wall surface. The brine is cooled in a cooling tank 3, run through a cooling passage 6 via a feed pipe 5 by a pump 4 and returned to the cooling tank 3 again through a return pipe 7. The ice generation wall surface 2 is cooled by running the brine through the cooling passage 6 and ice is generated on the inside surface 8 of the ice generation wall surface. Bubbles are generated from the inside surface 8 of the ice generation wall surface by a bubble generator 10 to separate the ice generated on the inside surface 8 of the ice generation wall surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for peeling ice formed on a wall surface, and can be suitably applied to, for example, an ice heat storage device.

  As a type of system for storing heat in a heat storage medium and performing heat exchange, for example, as shown in Patent Document 1, ice is used as a heat storage medium, and ice is manufactured and stored using inexpensive late-night power. There is an ice heat storage device that uses it as a cooling heat source for cooling or refrigeration of food.

  In general, an ice heat storage device has a so-called ice storage tank as a part for producing and storing ice, and the ice storage tank uses ice as a cold heat source as described above. When ice sticks, there exists a subject that the utilization efficiency as a cold heat source of manufactured ice falls.

  In order to solve this problem, as a known technique, a blade is placed in an ice storage tank, and the blade is rotated to mechanically peel off the ice fixed to the wall of the ice storage tank or ultrasonic oscillation. For example, Patent Document 2 discloses a method of arranging means and applying ultrasonic vibration to a wall surface on which ice is generated to remove ice.

Japanese Unexamined Patent Publication No. 2004-3750 JP-A-8-54163

  However, in the method described in Patent Document 2, there is a possibility that the ice accumulating tank wall surface is damaged by a blade or ultrasonic vibration that peels off ice, causing a failure of the ice heat storage device.

  Therefore, the present invention solves the above-mentioned problem, and does not damage the ice storage tank wall surface, and is a highly reliable and extremely simple method for peeling the ice formed on the wall surface, and the use of a cold heat source using this method An object is to provide an ice storage device with high efficiency.

As a result of diligent examination of the above problems, the present inventors have focused on the material of the piping used in the ice storage tank and adopted a pair of electrically conductive materials that are electrically separated into the material of the ice storage tank. Then, it was thought that by applying an electric field between them, water was electrolyzed to generate bubbles, and the ice fixed on the wall of the ice storage tank could be peeled off by the bubbles. This eliminates the need for using a mechanical means such as a blade inside the ice storage tank, eliminates the possibility of damaging the ice storage tank, and improves the utilization efficiency of the cold heat source.

  That is, the ice peeling method according to the present invention is characterized in that bubbles are generated from the surface of the wall surface on which ice is generated, and the ice is peeled off. The ice peeling method according to claim 1, further comprising: electrolyzing water to generate bubbles, and peeling the ice fixed on the wall of the ice accumulation tank by the bubbles. 2. A bubble is generated by electrolyzing water by applying an electric field between the generated wall surface and a pair of electrically conductive materials electrically separated from the wall surface. To 4 and an ice heat storage device using the method.

As described above, according to the present invention, it is possible to generate bubbles from the surface of the wall where ice is generated and peel the ice, so that it is not necessary to use a mechanical means such as a blade inside the ice storage tank, and the ice storage tank is damaged. There is no risk of causing the heat to be used, and the utilization efficiency of the cold heat source can be improved.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an ice heat storage device (hereinafter referred to as the present ice heat storage device) according to an embodiment of the present invention (hereinafter referred to as the present invention). The ice heat storage device 1 includes a brine pipe 2 that forms a circulation flow of brine, a refrigeration device 3 and a brine pump 4 that are arranged in the circulation flow formed by the brine pipe 2, and a heat storage fluid pipe that forms a circulation flow of the heat storage fluid. 5, the heat exchanger 6 and the heat storage fluid pump 7 are arranged in the circulation flow formed by the heat storage fluid pipe 5, and the inside of the circulation channel formed by the brine pipe 2 and the heat storage fluid pipe A heat transfer section 8 is connected in the circulation flow path formed by 5, and an ice storage section that stores ice is disposed, although not shown. Further, in the present ice heat storage device 1, a power supply device 9 for separating ice generated in the ice accumulating portion is connected to the heat transfer portion 8 to constitute a bubble generating device 10.

  The brine in the ice storage device 1 is circulated in the brine pipe 2 by the brine pump 4. More specifically, the brine is sent to the refrigeration apparatus 3 by the circulating flow generated by the brine pump 4 and cooled, and then sent to the heat transfer section 8 to exchange heat with the heat storage fluid by an appropriate means. Cool and freeze the heat storage fluid. Note that the brine that has exchanged heat with the heat storage fluid is sent again to the refrigeration apparatus 3 and repeats heat exchange with the heat storage fluid.

  The heat storage fluid in the ice heat storage device 1 is sent to the heat exchanger 6 by the circulating flow generated by the heat storage fluid pump 7 and absorbs heat, and then sent to the heat transfer section 8 to cool by exchanging heat with brine. Is done. The heat storage fluid that has exchanged heat with the brine is sent to the heat exchanger 6 again, and the above heat exchange is repeated.

The heat storage fluid in the present specification is not particularly limited as long as it is water or an aqueous solution, but an aqueous solution in which an electrolyte is dissolved is suitable, for example, from the viewpoint of foaming by electrolysis of water as described later. The brine in this apparatus is an aqueous solution having a melting point that is low enough not to freeze even when cooled in a refrigeration apparatus, and is not limited as long as it has this function, but specifically, an aqueous solution in which calcium chloride is dissolved is suitable. . For example, since the heat storage fluid is cooled by contacting the brine via a pipe or the like, the freezing point of the brine is preferably lower than the freezing point of the heat storage fluid from the viewpoint of the freezing point. For heat exchange, an appropriate means is selected from the efficiency and the size of the entire apparatus. It is not limited to the above.

  By the way, by repeating the above process, heat exchange with the outside of the apparatus can be performed through the heat exchanger. However, in the heat transfer section 8, the heat storage section 8 may be below the freezing point of the heat storage fluid. Ice may be generated on the inner wall of the fluid pipe 5. When this ice is generated, the flow path of the heat storage fluid is obstructed by the ice, and the heat transfer efficiency may be reduced. Therefore, in the present invention, ice on the inner wall of the heat storage fluid pipe 5 in the heat transfer section 8 is removed.

  The above will be described below. An outline of the heat transfer section 8 in the ice storage device 1 is shown in FIG. The heat transfer section 8 shown in FIG. 2 is formed in a part of the brine pipe 2 and the heat storage fluid pipe 5 to exchange heat, and the heat transfer section 8 according to the present embodiment stores the heat storage fluid inside. The thermal storage fluid piping part 51 to flow and the brine piping part 21 which is arrange | positioned on the outer side of this thermal storage fluid piping part 51 and forms a double pipe are comprised. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  As shown in FIG. 3, the cross section of the brine piping part 21 and the heat storage fluid piping part 51 in the heat transfer part 8 which concerns on this embodiment is square shape, for example, Comprising: The thermal storage fluid piping part 51 is a pair of opposing. It is composed of a conductive member 511 and a pair of opposing insulating members 512. The pair of conductive members 511 are respectively connected to the power supply device 9, and an electric field is generated between the pair of conductive members 511 by a voltage applied by the power supply device 9. When an electric field is generated in the pair of conductive members 511, bubbles are generated on the surface of the conductive member 511. As shown in FIG. 4, the ice fixed on the surface of the conductive member 511 can be peeled off by the bubbles. The power supply device 9 is not limited as long as an electric field can be generated in the pair of conductive members 511 as shown in FIG. 3, and the voltage applied by the power supply device 9 may be either DC or AC. .

FIG. 5 is an example of an ice heat storage device using a voltage power source 27 as the bubble generating device 14. A voltage is applied by the voltage power source 27 using the ice generation wall surface 20 as an anode and the ice generation wall surface 21 as a cathode, and bubbles are generated from the inner surface 28 of the ice generation wall surface and the inner surface 29 of the ice generation wall surface shown in FIG. Peel the ice.

  In this ice heat storage device, the brine circulation system 11 cools the brine with the refrigerator 15, feeds it with the pump 16, splits in half along the piping 17, and flows into the lower part of the cooling flow path 18 and the cooling flow path 19. Let And the ice production | generation wall surface 20 and the ice production | generation wall surface 21 are cooled in the process which flows through the cooling flow path 18 and the cooling flow path 19, Then, the return piping 22 is returned to the refrigerator 15 and circulated.

The heat storage fluid circulation system 12 adjusts the temperature of the heat storage fluid in the thermostatic bath 23 and causes the pump 24 to flow into the lower portion of the ice generation unit 13 through the feed pipe 25. The heat storage fluid is cooled by the ice generation wall surface 20 and the ice generation wall surface 21 in the process of flowing upward through the ice generation unit 13, and generates ice on the inner surface 28 of the ice generation wall surface and the inner surface 29 of the ice generation wall surface. The heat storage fluid that has not become ice flows out from the upper part of the ice generator 13 and returns to the thermostat 23 through the return pipe 26 to be circulated.

As the applicability of the present invention, as described above, there is an ice heat storage device first. By utilizing the present invention, ice that becomes a heat transfer resistance can be peeled off to efficiently generate ice.

    Secondly, if the inside of the pipe in the fluid transport freezes, the flow path shrinks and the pipe ruptures. Therefore, by using the present invention, it is possible to prevent flow path reduction and tube rupture.

Third, snow and icicles can be removed. Since the snow accumulated on the roof of the building melts and becomes ice on the roof surface, the present invention can be used to peel off the ice on the snow surface and drop it to the lower part of the building. Thereby, the burden on the building due to the weight of snow can be reduced. Also, it is uncertain when the icicle will fall, and the lower part of the icicle is dangerous. Therefore, the ice column can be dropped by the present invention, and danger is prevented. As described above, the present invention can be easily peeled off the ice fixed to the wall surface or the inner surface of the tube, and can be implemented in a wide range and is extremely useful.

It is a figure which shows the block diagram of the ice thermal storage apparatus which concerns on this invention. It is sectional drawing of the heat-transfer part of the ice peeling apparatus which concerns on this invention. It is a cross-sectional view of the heat transfer section of the ice peeling device according to the present invention. It is a figure which shows foaming of the heat-transfer part of the ice peeling apparatus which concerns on this invention. It is a figure which shows the structural example of the ice heat storage apparatus of the ice which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ice thermal storage apparatus 2 ... Brine piping 3 ... Refrigeration apparatus 4 ... Brine pump 5 ... Thermal storage fluid piping 6 ... Heat exchanger 7 ... Thermal fluid pump 8 ... Heat transfer part 9 ... Power supply device 10 ... Bubble generator 11 ... Brine circulation System 12 ... Thermal storage fluid circulation system 13 ... Ice generating unit 14 ... Bubble generating device 15 ... Cooling tank 16 ... Pump 17 ... Feeding pipe 18 ... Cooling channel 19 ... Cooling channel 20 ... Ice generating wall surface 21 ... Ice generating wall surface 22 ... Return pipe 23 ... Constant temperature bath 24 ... Pump 25 ... Feed pipe 26 ... Return pipe 27 ... Voltage power supply 28 ... Inner surface 29 of ice generating wall surface ... Inner surface 51 of ice generating wall surface ... Heat storage fluid piping part 511 ... Conductive member 512 ... Insulation Element

Claims (6)

An ice peeling method characterized in that bubbles are generated from the surface of a wall surface on which ice has been generated to peel the ice. The ice peeling method according to claim 1, wherein bubbles are generated by electrolysis of water, and the ice formed on the wall surface is peeled off by the bubbles. Claims characterized in that water is electrolyzed by applying an electric field between a wall surface on which ice is generated and at least a pair of conductive materials electrically separated from the wall surface to generate bubbles. Item 3. The ice peeling method according to Item 2. 2. The method according to claim 1, wherein a voltage is applied by using a wall surface where ice is generated as an anode and a wall surface where ice is formed as a cathode as a cathode, bubbles are generated from the wall surface, and ice is separated from the wall surface. Ice peeling method. A brine circulation system connected to a refrigeration system in which the brine circulates;
A heat storage fluid circulation system in which the heat storage fluid circulates;
A heat transfer section connected to the brine circulation system and the heat storage fluid circulation system, for exchanging heat between the brine circulation system and the heat storage fluid circulation system;
A power supply device and at least a pair of conductive members that generate an electric field by a voltage applied by the power supply device disposed in the brine circulation system and / or the heat storage fluid circulation system,
Bubbles are generated on the surface of the conductive member by the generation of the electric field,
An ice heat storage device characterized in that ice generated in the brine circulation system and / or the heat storage fluid circulation system is peeled off by the bubbles. A brine circulation system connected to a refrigeration system in which the brine circulates;
A heat storage fluid circulation system in which the heat storage fluid circulates;
A heat transfer section connected to the brine circulation system and the thermal storage fluid circulation system, and having an inner surface for exchanging heat between the brine circulation system and the thermal storage fluid circulation system;
A power supply,
The inner surface of the heat transfer section that is electrically connected to the power supply device is used as an anode, and the opposite inner surface is used as a cathode.
Voltage is applied by the power supply,
An ice heat storage device characterized in that bubbles are generated from the wall surface and the ice is separated from the wall surface.