JPH0798132A - Ice heat accumulator - Google Patents

Abstract

PURPOSE:To form such a state that return water flows strongly in an ice heat- accumulating tank for a long time without flowing quickly to the side of expelling, by providing the jet of a cold-water return pipe at an upper underwater part in the ice heat-accumulating tank, pointing to horizontal direction. CONSTITUTION:The jet of a cold-water return pipe 5a is located at the upper part under a waterlevel 2, pointing to almost horizontal direction at one of the walls of an ice heat-accumulating tank 1. In this way, the cold-water return pipe 5a horizontally injects a jet stream 6 consisting of return water, pointing to ice lumps 3 in the ice heat-accumulating tank 1. The heat of the jet stream 6 is exchanged in the ice lumps 3 and melts the ice lumps 3. At the same time, the jet stream 6 peels the ice lumps 3 from the walls and takes the ice lumps 3 to pieces in the limits where the jet stream 6 diffuses. Since the jet stream with a higher temperature is in direct contact with the ice lumps, at the part with max. temperature difference, the jet stream effectively receives the latent heat of ice. Furthermore, since the jet injects the jet stream horizontally, an area where the jet stream is in contact with the ice lumps lengthens and since the jet stream takes the ice lumps in pieces, the contact area of the ice to water increases. In this way, the efficiency of heat accumulation is sharply improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a harvesting method, a liquid ice method, which does not have an ice making heat transfer surface in an ice heat storage tank.
Ice is made by the plate ice method, supercooled water ice making method, etc.
The present invention relates to an ice heat storage device including an ice heat storage tank in which water and ice are stored.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show an example of a conventional ice heat storage device. When these are first outlined, FIG. 6 shows a case where the cold water after use is returned to the heat storage tank by a single nozzle or the like in the ice heat storage tank.
Shows the case where the return water was sprayed by the spray device 12 to promote the melting of ice.

Next, these will be described in detail. FIG. 6 shows an ice heat storage device comprising an ice heat storage tank 1, a water surface 2, an ice block 3, a cold water delivery pipe 4, a cold water return pipe 5, and an ice making machine 7. Here, the ice making machine 7 is of a harvesting method, a liquid ice method, a plate ice method, a supercooling ice making method, or the like.
The case where the ice-making is stored in the ice heat storage tank 1 is shown.
The cold water return pipe 5 returns the cold water to the ice heat storage tank 1 at a temperature of 8 ° C. to 14 ° C., but the ice blocks 3 in the ice heat storage tank 1 are entirely in the ice heat storage tank 1 except when using brine such as a liquid ice system. ,
Since the return water of the cold water return pipe 5 in FIG. 6 locally melts the ice block 3 to form the return water tunnel 11 and the relatively high temperature region is formed in the lower part of the ice block 3 because they are united although there is a difference in degree. At the same time as it is made, it makes a short pass to the cold water delivery pipe 4, which hinders the effective melting of the ice blocks 3 and reduces the heat storage efficiency.

On the other hand, in FIG. 7, a spraying device 12 is attached to the cold water return pipe 5 of FIG. 6 to spray return water to promote melting of the ice block 3 and improve its heat storage efficiency. When the ice lumps 3 are strongly connected, the spray water flows around the ice lumps 3, but as the ice lumps 3 become 1/2 or 1/3 of the ice storage tank 1, the cold water is dispensed without touching the ice lumps 3. The return water bypass amount to the pipe 4 increases, the cold water payout temperature rises, and the heat storage efficiency decreases.

[0005]

The above-mentioned conventional ice heat storage device has the following problems (1) to (4) to be solved.

(1). In the conventional device, the discharge from the cold water return pipe 5 is returned to the ice heat storage tank 1 in the direction of gravity, that is, in the vertical direction, but the ice block 3 itself is in a horizontally expanded state, and at the end of the heat storage payment, its thickness There is a problem that the return water of the vertical flow becomes short and the crossing distance becomes short and the contact time is short, the return water bypasses to the discharge side, and the heat storage efficiency decreases due to the increase of the discharge temperature.

(2). The density of water in the ice storage tank 1 is 4 ℃
However, the density becomes smaller due to the temperature change from 4 ° C to 0 ° C and from 4 ° C to the higher temperature side, and the vertical temperature distribution occurs in the ice storage tank 1 according to this density difference. However, there is a problem in that the heat storage efficiency is reduced due to the mixing of these water flows.

(3). For the method of discharging from the ice heat storage tank 1 to the regional water supply system, the closed method via a heat exchanger,
There are two types of open system that directly discharges the discharged cold water to the regional water supply system.

In the case of the open system, the local water supply system itself has a required pressure (4 to 6 kg / cm ² G in the return pipe) in order to enable supply to high-rise buildings and the like. There is a case where a power recovery turbine or the like is used as a method for reducing the pressure to atmospheric pressure through a return pipe, but most of the time, it is throttled by a valve and returned to the ice heat storage tank 1. In the conventional return water flow in the vertical direction, since the ice blocks 3 are moved by the secondary flow that mixes the water in the ice heat storage tank 1, the ice blocks 3 stay in the stagnation area and the kinetic energy of the return pipe jet is transferred to the ice blocks. There is a problem in that it cannot be directly used for crushing and moving of No. 3.

(4). In order to increase the heat storage efficiency of the ice heat storage tank 1, it is effective to crush the ice blocks 3 to increase the area in contact with water. However, except when brine such as liquid ice is used, there is a problem that fusion of ice occurs in clear water, the ice block 3 grows larger, the contact area with water decreases, and heat storage efficiency decreases. .

In order to solve the above-mentioned problems, the present invention makes it possible for return water to come into contact with ice blocks for as long a time as possible without bypassing to the discharge side and to form a strong flow state in the ice heat storage tank. It is an object of the present invention to provide a highly efficient ice heat storage device that decomposes and stirs ice blocks.

[0012]

The present invention is intended to provide an ice heat storage device described in the following (1) to (6) as a means for solving the above problems.

(1). In the ice heat storage device that stores the ice making ice together with water in the heat storage tank and circulates the cold water in the heat storage tank to the user side through the cold water discharge pipe and the cold water return pipe, in the heat storage tank of the cold water return pipe The ice heat storage device is characterized in that the jet nozzle of is installed in a horizontal direction at an upper part below the water surface.

(2). The ice thermal storage device according to (1) above, wherein the nozzle is installed obliquely upward.

(3). The ice heat storage device according to (1) above, wherein a plurality of the injection ports are provided and are installed obliquely upward and obliquely downward.

(4). The ice heat storage device according to (1) above, wherein the jet nozzle is installed so that its jet angle can be adjusted.

(5). The ice heat storage device according to (1) above, wherein a plurality of the jet holes are provided, and the jet heat shafts are installed on two opposing surfaces of the heat storage tank so that they do not collide with each other.

(6). The ice heat storage device according to (4) above, further comprising a drive device for adjusting the jet angle.

[0019]

Since the present invention is constructed as described above, it has the following actions.

(1). In the configuration of (1) above, the jet port from the cold water return pipe stores heat because the jet port in the heat storage tank of the cold water return pipe is installed above the water surface in the lateral direction (horizontal direction). In the tank, the ice mass near the water surface is moved horizontally, that is,
The longest direction of the ice block or the direction of contact with the small ice blocks floating in a group for the longest time flows in the direction, and the cooling efficiency of the return water increases.
That is, the bypass of the return water to the payout side is eliminated, and the heat storage efficiency is improved.

Further, since the ice blocks are broken down by the dynamic pressure of the jet flow and decomposed into small blocks, the surface area of the ice increases, more specifically, the surface ratio, volume ratio, and the heat storage efficiency also increase.

Further, heat exchange can be performed in the state where the temperature difference between the ice block and the cold water return is the highest, the bypass of return water to the discharge pipe is small, the utilization rate of latent heat of ice is improved, and the heat storage efficiency is improved and the heat storage tank is increased. Can be made small and the economic efficiency can be greatly improved.

Further, since it is a lateral jet flow, the kinetic energy of the jet flow acts on the upper half (ice block retention part) of the heat storage tank, so that the conventional vertical cold water return system acts on the entire tank. The target mass is small, the flow speed in the ice block is high, the stirring effect and the ice block decomposition effect are high, and the heat storage efficiency is improved.

(2). In the configuration of (2) above, since the injection port of the configuration of (1) is installed in an obliquely upward direction, in addition to the action of (1) above, the jet has an upward component, so that wave motion is generated in the heat storage tank. As a result, the adhered state between the ice block and the wall is separated, and the ice block is decomposed efficiently.

(3). In the configuration of (3) above, a plurality of nozzles of the above configuration (1) are provided, and the nozzles are installed obliquely upward and obliquely downward. Therefore, when the nozzles are installed obliquely upward, In addition to the action, the ice block decomposing action is further enhanced by the standing flow difference of the jet having both upward and downward components alternately.

(4). In the configuration of (4) above, since the jet nozzle of the configuration of (1) is installed so that the jet angle can be adjusted, the jet direction can be horizontal, obliquely upward, upward, obliquely downward, downward, left and right. It can be freely changed, and the same or similar action as the above (1) to (3) can be achieved by one injection port.

Further, by continuously changing the direction of the injection port, various flow states can be continuously formed, and the ice lump and water can be mixed in a state close to stirring, so that the heat storage efficiency is highly enhanced.

As a result of the higher heat storage efficiency, the number of nozzles can be reduced.

(5). In the configuration of (5) above, a plurality of nozzles of the above configuration (1) are provided and installed so that the jet axes do not collide with each other on two facing surfaces of the heat storage tank. As a result, the force exerted on the ice blocks increases synergistically, increasing the ice block breaking ability.

(6). In the configuration of (6) above, since the drive device for adjusting the jet flow angle of the jet outlet of the configuration of (4) is provided, the action of the above (4), that is, the above (1) to
The function equivalent to (3) and the function of continuously creating various flow states can be automatically performed.

Further, the jet angle can be freely adjusted by remote control, for example.

[0032]

Embodiments First to fifth embodiments of the present invention will be described with reference to FIGS. The same components as those in the conventional example or the previous example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

(First Embodiment) The first aspect of the invention according to claim 1
An embodiment will be described with reference to FIG.

FIG. 1 is a side sectional view of this embodiment, which is designated by reference numeral 1
Reference numerals 2, 3, 4, and 7 are components similar to those of the conventional example, 1 is an ice heat storage tank, 2 is a water surface, 3 is an ice block, 4 is a cold water delivery pipe, and 7 is an ice making machine.

Reference numeral 5a is an upper portion below the water surface 2, and a cold water return pipe is installed with the jet port oriented substantially horizontally (laterally) from one end of the wall of the ice heat storage tank 1, and 6 is from the jet port of the cold water return pipe 5a. It is a jet of return water ejected.

It should be noted that, in the figure, a plurality of dumpling-like figures are not called because they are an indefinite number, but they are individual ice pieces constituting the ice blocks 3.

The curved arrows in the ice heat storage tank 1 schematically show the flow state of water or ice pieces caused by the jet flow 6, or the rotation state of the ice pieces due to the flow.

Next, the operation of the above configuration will be described.

In the figure, the cold water return pipe 5a jets a jet flow 6 of the cold water return water laterally toward the ice blocks 3 in the ice heat storage tank 1. The jet flow 6 exchanges heat within the ice block 3 to melt the ice, and at the same time, the ice block 3 is separated and decomposed in the jet diffusion region.

By directly contacting the high temperature jet stream 6 and the ice block 3 at the maximum temperature difference portion, the latent heat of the ice is effectively utilized, and the jet 6 is laterally jetted so that the contact area with the ice block 3 is increased. Due to the long breakage of the ice blocks 3, the contact area of ice and water increases, which greatly improves the heat storage efficiency of the device of this embodiment.

(Second Embodiment) Second embodiment according to the invention of claim 2
An embodiment will be described with reference to FIG.

FIG. 2 is a side sectional view of the present embodiment, and 5b is a cold water return pipe installed obliquely upward from one end of the wall of the ice heat storage tank 1,
Reference numeral 8 is a free water surface formed by the upward component of the jet 6 from the cold water return pipe 5b, and 19 is the heading angle of the cold water return pipe 5b.

The other structure is not particularly different from that of the first embodiment.

Next, the operation of the above configuration will be described.

In the figure, the jet flow 6 of the return water is jetted obliquely upward at a heading angle 19. As shown in the velocity decomposition diagram in the figure, since it has both horizontal and vertical components, the free water surface 8 is formed mainly at the point where the jet flow 6 reaches the water surface 2. After reaching, the water flow flows toward the upper surface of the ice mass 3 on the wake side and the opposing wall.

As described above, in the present embodiment, the free water surface 8 swings by the upward speed and the wave formation thereof can reduce the ice adhesion near the wall surface and effectively generate the latent heat of melting of ice. .

(Third Embodiment) The third embodiment according to the invention of claim 3
An embodiment will be described with reference to FIG.

3A and 3B are views of this embodiment, FIG. 3A is a side sectional view, and FIG. 3B is a sectional view taken along the line AA of FIG.

In FIG. 3, reference numeral 5c designates a cold water return pipe provided substantially horizontally below the water surface 2 at one end of the wall of the ice heat storage tank 1.
d is a header fixed substantially vertically and horizontally to the inner end (tip) of the cold water return pipe 5c, and 5e is a plurality of nozzles (five in the figure) provided in the header 5d alternately obliquely upward and downward. Is.

The other structure is not particularly different from that of the first embodiment.

Next, the operation of the above configuration will be described.

In the figure, the jets 6 ejected from the nozzles 5e alternately incline upward and obliquely downward, forming flows having different directions in the ice blocks 3 and shearing effects between the flows, so that the ice blocks 3 Is effectively divided, and the heat storage efficiency is enhanced by the wave-making effect of the standing flow.

(Fourth Embodiment) A fourth embodiment according to the inventions of claims 4 and 6 will be described with reference to FIG.

FIG. 4 is a schematic view of this embodiment, (a) is a side sectional view, and (b) is a sectional view (partial view) taken along the line AA of (a).

In the figure, 9 is a movable nozzle which is provided at an appropriate position of the header 5d so that the jet angle can be adjusted via a drive mechanism 10a, and 10 is for driving the movable nozzle 9 installed above the header 5d. The drive unit 10 a is a drive mechanism interposed between the drive unit 10 and the movable nozzle 9 for converting the power of the drive unit 10 into swing of the movable nozzle 9.

Although not shown in particular, the drive unit 10 is constructed so as to be able to detect the payout status of the ice heat storage tank 1, the density of a group of ice blocks 3, etc., and the location of the ice blocks.

The other structure is not particularly different from that of the third embodiment.

Next, the operation of the above configuration will be described.

The driving machine 10 detects the position, the density, etc. of the ice blocks 3 and adjusts the movable nozzle 9 to the optimum jet angle. The jet flow 6 jetted from the movable nozzle 9 most effectively forms a flow in the ice block 3 and divides the ice block 3 and stirs it. As a result, high heat storage efficiency can be exhibited.

Further, since the movable nozzle 9 can be directed in a desired direction, in addition to the effects of the first to third embodiments, control such as following the remaining ice blocks 3 according to the payout situation of the ice heat storage tank 1 is performed. It is also possible to increase the range of coverage of one movable nozzle 9 and reduce the number of movable nozzles 9, thereby further improving the economical efficiency.

In this embodiment, the driving machine 10 is used to operate the movable nozzle 9. However, this can be omitted and the movable nozzle 9 can be oriented in a desired direction intermittently or in accordance with the situation at that time. The configuration may be adjusted.

That is, the use of the driving machine 10 is not limited.

(Fifth Embodiment) The fifth invention according to claim 5
An example will be described with reference to FIG.

FIG. 5 is a side sectional view of this embodiment. Cold water return pipes 5c are provided in the ice heat storage tank 1 so as to face each other from the left and right sides of the drawing. 5f is on both headers 5d, one is diagonally upward,
The other is a nozzle provided obliquely downward, and is configured so that both jet flows 6 do not collide with each other.

The other structure is similar to that of the third embodiment, for example.

Next, the operation of the above configuration will be described. In the case of the present embodiment, a strong shearing force acts between the two jets 6 facing each other, and the force received by the ice block 3 does not move the groups of the individual ice pieces due to the couples of the ice cubes 3 and stays at that position. Since it receives a large force or rotates due to a couple, the degree of contact with water increases per hour, the ice blocks 3 are divided very efficiently, and the divided ice pieces efficiently contact water. Since it absorbs heat, the heat storage efficiency is extremely high.

Although FIG. 5 shows the case where the nozzles 5f are opposed to each other by inclining them obliquely so that the jets 6 do not collide with each other, a means for preventing the mutually opposing axes of the jets 6 from colliding with each other is shown. It is not necessary to use only the inclination, and it can be applied to the horizontal jet or the obliquely upward jet shown in FIGS. 1 and 2, for example.
In that case, if the pitch of the nozzles 5f is shifted in the depth direction of the drawing, the purpose can be achieved without causing the jet flow 6 to collide.

As described above, according to the first to fifth embodiments,
The jet flow generated by the return cold water to the ice heat storage tank is horizontally or diagonally upward or downward from one end of the ice heat storage tank to the other end, or oppositely so as not to collide with each other. Or diagonally to the left or right, or using the driving force to move horizontally, vertically,
Since the flow can be formed in any direction between the left and right sides, the jet path that passes through the ice mass becomes long, and the heat exchange time with ice across the vertical direction is significantly shortened as in the past. There is an advantage that the efficiency of the heat storage tank, which was low, can be significantly increased.

Further, since the flow can be caused in a relatively upper part in the ice heat storage tank, so to speak, the ice blocks do not stay in a specific area in the tank, and the heat storage efficiency is improved also from this point. There is an advantage.

Further, the effect of dividing the ice blocks by the shear flow is enhanced, and the ice blocks are further subdivided to increase the surface area / volume / ratio to the ice, and the heat absorption efficiency from water is improved. Has the advantage that

Further, as in the conventional case, only in the vertical direction,
Unlike the jet flow due to spraying etc., a strong flow is formed in the entire upper part of the tank, so the stirring effect of the entire area except the lower layer is great, but unlike the conventional method, it does not stir up to the cold water area in the lower layer of the tank, The high specific gravity cold water required for discharging is always in the lower layer, and there is an advantage that the cooled water is always discharged effectively.

[0072]

Since the present invention is constructed as described above, it has the following effects (1) to (6).

(1). In the invention of claim 1, the cold water return water jet port is directed toward the ice block in the ice heat storage tank and jetted in the lateral direction (horizontal direction), so that the accumulated ice existing up to the wall facing the jet port is longitudinally crossed. It is possible to make contact with the maximum temperature difference. This is because the ice storage thickness (vertical direction) becomes thinner, such as when the amount of ice storage at the end of the heat storage tank delivery is getting smaller, but it keeps dramatically longer than the contact time in the vertical flow (vertical direction). The heat exchange efficiency is correspondingly increased. Further, by making the jet flow lateral, it is possible to directly transfer kinetic energy to the ice blocks, promote the decomposition of the ice blocks, improve the contact area between water and the ice blocks, and improve heat storage efficiency. The ice heat storage tank can be made smaller and the economy is improved. In addition, since the mother water pressure of the cold water return water can be used for melting and decomposing ice, mixing,
Energy is saved because auxiliary energy such as stirring is not required.

(2). In the invention of claim 2, by jetting the jet obliquely upward to give a vertical (up and down) component velocity, in addition to the effect of claim 1, freedom of jet flow in the middle of the wall surface facing the ice storage tank jet The water surface is constituted, and a wave motion is generated in the ice heat storage tank by the upward velocity component to separate the adhesion between the ice block and the wall and accelerate the decomposition of the ice block. In addition, when the ice filling rate is high, the obliquely upward jet stream efficiently decomposes the ice blocks that tend to remain in the upper layer, thus improving the heat storage efficiency.

(3). According to the third aspect of the invention, the effects of the first and second aspects can be further enhanced by the obliquely upward and downward jet flows. In particular, the oblique upper and lower jets have a high effect of mixing the divided ice blocks in the vertical direction, and the heat storage efficiency is improved.

(4). According to the invention of claim 4, by adopting the jet nozzle with a movable mechanism for freely adjusting the jet angle of the jet port, a variety of types can be obtained as compared with the case of the stationary flow in the case of the fixed nozzle of the first to third aspects. Flow patterns can be created, the mixing of ice blocks and water is promoted, the coverage area of the spout is expanded, the number of spouts required for one cold water return pipe header can be reduced, and the economic efficiency can be improved. .

(5). According to the invention of claim 5, the jet axes of the jet nozzles are arranged on two opposite surfaces of the ice heat storage tank without colliding with each other, so that the ice blocks in the area surrounded by both jet jets generate shearing force due to mutual jet jets. In the case of a one-way jet flow, the ability to divide ice blocks is doubled, and the heat storage efficiency is greatly improved.

Further, in the one-way jet, a stagnation region is likely to occur at the base of the jet, but in the opposed type, the stagnation region is reduced in the vicinity of one jet port due to the influence of the other jet, and the heat storage efficiency is improved. Economical efficiency increases.

(6). In the invention of claim 6, since the operation of the configuration of claim 4, that is, the adjustment of the jet angle is performed by the drive device, horizontal flow, obliquely upward, downward, left, right flow can be continuously created. The most ideal condition is that ice flocs can be decomposed and agitated above the inside of the ice heat storage tank by various types of flow conditions very efficiently, and by attaching an ice detector to the drive unit, the ice flocs can be traced and concentrated and decomposed. An ice heat storage device is obtained.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of an ice heat storage device according to a first embodiment of the present invention,

FIG. 2 is a schematic side sectional view of an ice heat storage device according to a second embodiment of the present invention,

FIG. 3 is a schematic view of an ice heat storage device according to a third embodiment of the present invention, (a) is a side sectional view, (b) is a sectional view taken along the line AA of (a),

FIG. 4 is a schematic view of an ice heat storage device according to a fourth embodiment of the present invention, (a) is a side sectional view, (b) is a sectional view (partial view) taken along the line AA of (a),

FIG. 5 is a schematic side sectional view of an ice heat storage device according to a fifth embodiment of the present invention,

FIG. 6 is a side sectional view of a conventional single nozzle system,

FIG. 7 is a side sectional view of another conventional spray method.

[Explanation of symbols]

 1 Ice Heat Storage Tank 2 Water Surface 3 Ice Block 4 Cold Water Discharge Pipe 5a, 5b, 5c Cold Water Return Pipe 5d Header 5e, 5f Nozzle 6 Jet Flow 7 Ice Machine 8 Free Water Surface 9 Movable Nozzle 10 Driver 10a Drive Mechanism

Claims (6)

[Claims] 1. An ice heat storage device for storing ice made ice together with water in a heat storage tank and circulating cold water in the heat storage tank to a user side through a cold water discharge pipe and a cold water return pipe,
An ice heat storage device, characterized in that a jet port of the cold water return pipe in the heat storage tank is installed in a lateral direction at an upper portion below the water surface. 2. The ice heat storage device according to claim 1, wherein the injection port is installed obliquely upward. 3. The ice heat storage device according to claim 1, wherein a plurality of the injection holes are provided and are installed alternately obliquely upward and obliquely downward. 4. The ice heat storage device according to claim 1, wherein the jet nozzle is installed so that a jet angle thereof can be adjusted. 5. The ice heat storage device according to claim 1, wherein a plurality of the jet holes are provided and they are installed on two opposing surfaces of the heat storage tank so that the jet axes do not collide with each other. 6. The ice heat storage device according to claim 4, further comprising a drive device for adjusting the jet flow angle.