JP3018191B1 - Heat storage device - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To store large amounts of heat energy from the outside while simultaneously storing heat and cold respectively.
A heat storage device capable of quickly changing the capacity of the hot region and the cool region is obtained. SOLUTION: A wall surface facing each area of a movable wall 2 that partitions a heat storage tank 1 into which a heat storage material for storing given heat is filled into a heat area 7 and a cold area 8 has heat insulation. At the same time, a heat storage area 3 for taking in a part of the heat storage material in the areas 7 and 8 is formed inside the movable wall 2 through flow holes 4a and 4b communicating with the areas 7 and 8 provided in the wall. Then, in the heat storage region 3, there is provided a temperature hierarchy forming means for suppressing the convection of the heat storage material flowing from the flow holes and forming a temperature hierarchy between the hot heat and the cold heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device for storing heat for a certain period of time, and more particularly to a heat storage device capable of simultaneously storing hot and cold heat.

[0002]

2. Description of the Related Art FIG. 6 is a schematic sectional view of a heat storage device disclosed in Japanese Utility Model Laid-Open Publication No. Hei 6-10730, in which a heat storage tank 51 is provided with a movable partition wall 52 made of a heat insulating material.
The upper compartment 53 is divided into an upper compartment 53 and a lower compartment 54, and the upper compartment 53 stores warm heat and the lower compartment 54 stores cold heat. . In the upper section 53, hot water h as a heating element manufactured by a water heater 55 is supplied from a heating pipe 57 by a pump 56, and when the hot water h is used, the pump 58 passes through the heating pipe 59 from the upper section 53 by the pump 58. The hot water h is supplied to the heat utilization facility 60. On the other hand, the lower section 54 includes the refrigerator 6
The cold water c as the cooling body manufactured by
When the cold water c is used, the pump 64 is connected so that the cold water c is supplied to the cold heat utilization equipment 66 through the cold heat pipe 65 when the cold water c is used.

In the heat storage device configured as described above, the capacity can be changed between the upper section 53 storing hot water h and the lower section 54 storing cold water c by moving the movable partition 52. It is. However, in this heat storage device, due to a change in capacity due to the movement of the movable partition wall 52, the excess hot water h or cold water c from the section having reduced capacity is temporarily taken out to the outside, and the external water heater 55 is used. Alternatively, it is necessary to operate the refrigerator 61 to convert the water to cold water or hot water having completely different temperatures, supply the cold water or warm water to the compartment having a larger capacity, and store the water again. Therefore, the upper compartment 53 and the lower compartment 54 in the heat storage tank 51
When the capacity is changed, a large amount of external heat energy is required by the operation of the water heater 55 or the refrigerator 61 in order to turn the surplus hot water h or cold water c into the insufficient cold water or hot water. is there. Moreover, the above-mentioned warm water h
Alternatively, it takes a considerable amount of time to complete a series of processes from temperature conversion to storage of the cold water c, and it may not be possible to cope with a change in the demand of hot or cold water. In addition, extra hot water h or cold water c is temporarily taken out,
Since separate equipment for storage is required, the entire apparatus may be large.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its technical problem is to provide a movable wall having a heat storage function inside a heat storage tank. Another object of the present invention is to provide a heat storage device capable of quickly changing the capacities of a warm region and a cool region without inputting large heat energy from the outside while simultaneously storing heat and cool heat. Another technical problem of the present invention is that, when changing the capacity of the hot region and the cold region, it is not necessary to take out extra hot water or cold water even temporarily, and consequently suppress the increase in size of the entire apparatus. An object of the present invention is to provide a heat storage device that enables the above.

[0005]

In order to solve the above-mentioned problems, a heat storage device according to the present invention comprises a heat storage tank in which a heat storage material for storing given heat is filled, and a hot and cold heat storage chamber. In the heat storage device, a movable wall that partitions each of the regions into heat storage areas is provided, and the movable wall is made movable by an external force in the heat storage tank, so that the volume ratio of each area can be changed. In addition to providing heat insulation to the wall surface facing each region, a heat storage region is formed inside the movable wall through a flow hole communicating with each region provided on the wall surface to take in a part of the heat storage material in those regions. Further, a temperature hierarchy forming means is provided in the heat storage area for suppressing the convection of the heat storage material flowing from the flow hole to form a temperature hierarchy between hot and cold heat.

In the present invention, the temperature layer forming means is formed of a liquid absorbing material or a second heat storage material,
The flow holes may be formed by holes from which they do not flow out, and the liquid-permeability and heat-storage solid in which the temperature layer forming means is fixedly disposed in the heat storage area in the movable wall. It can be formed by a member.

In the heat storage device having the above-described structure, the movable wall having a heat insulating wall surface divides one heat storage tank into a hot region and a cold region, and the two walls are appropriately moved by external force. The volume ratio can be varied. In the heat storage area inside the movable wall, a heat storage material is taken in through a communication hole communicating with the heating area and the cooling area, and the heat storage material allows the communication hole on the heating and cooling area side from the communication hole on the heating area side. , Respectively, flows in and is stored. The hot and cold heat flowing into the heat storage area is also stored in the liquid-absorbing substance, the second heat storage material, or the heat-storing solid member contained in the heat storage area. , A temperature hierarchy is formed between hot and cold heat, and the warm region side is closer to the warm temperature, and conversely, the cool region is closer to the cool temperature. In addition, the generation of natural convection is suppressed by the liquid-absorbing substance, the second heat storage material, or the heat storage solid member, and the temperature hierarchy is maintained.

When changing the ratio of the volume of the hot region to the volume of the cold region in the heat storage tank, the movable wall is moved by an external force. At this time, the heat storage material in the region in which the volume decreases decreases flows into the heat storage region of the movable wall, and the heat storage material in the heat storage region is extruded toward the region in which the volume increases. Is formed, the heat storage material flowing from one region into the heat storage region extrudes a heat storage material close to the temperature of the heat storage material in the other region. Further, the heat storage material flowing into the heat storage region in the movable wall gradually exchanges heat with the liquid-absorbing substance, the second heat storage material, or the heat storage fixed member accommodated in the heat storage region, thereby gradually increasing the heat storage material. The temperature of the heat storage material passing through the heat storage area reaches a temperature substantially equal to the temperature of the destination area, and flows out to the destination area. The temperature change in each area due to the change in the ratio is reduced. Therefore, it is not necessary to input a large amount of heat energy from the outside to convert the temperature of the heat storage material as in the related art, and the volume of each region can be easily and quickly changed.
In addition, since there is no need for a facility for temporarily taking out the excess heat storage material to the outside and storing it, it is possible to suppress an increase in the size of the entire heat storage device.

[0009]

[First Embodiment] FIG. 1 is an example of a sectional view of a heat storage device according to the present invention. This heat storage device has a heat storage tank 1 containing water therein as a heat storage material for storing heat.
And a movable wall 2 that divides the inside of the heat storage tank 1 into a warm region 7 for storing warm heat and a cool region 8 for storing cool heat, and the movable wall 2 can be moved by an appropriate external force. By doing so, it is possible to change the ratio of the volume of the warm region 7 and the cool region 8 in the heat storage tank 1. In the case of this embodiment, the upper section of the heat storage tank 1 is a warm area 7 and the lower section is a cool area 8. In this embodiment, water is used as the heat storage material. However, the material is not limited as long as it is a fluid substance such as alcohol, ethylene glycol, or chlorofluorocarbon.

On the side of the heat area 7 in the heat storage tank 1, a heat transfer path 9 for supplying a heat storage material in which heat is stored to various heat utilization equipments 10, and a used heat storage material from the heat utilization equipment 10 Return path 11 for returning heat into the heating area 7 by the pump 12, and the heat storage material in the heating area 7 to the pump 1.
6 is provided with a heating outlet 13 for sending out by the heating means 6 and a heating inlet 15 for feeding the heat storage material into the heating area 7 after being heated by the heating means 14. On the other hand, heat storage tank 1
A cold heat delivery path 19 for supplying a heat storage material in which cold heat is stored to various cold heat utilization equipments 18 on the side of the cold heat area 8 in the inside;
The used heat storage material from the cold heat utilization equipment 18 is pumped by pump 2
0, a return path 17 for cooling and returning to the inside of the cold area 8 by a pump 0, a lead-out path 23 for cooling and sending out the heat storage material in the cold area 8 by a pump 24, and cooling the heat storage material by the cooling means 22 before cooling the cooling area 8 And a cooling / heating introduction path 21 to be fed into the inside.

In the above-mentioned heat storage device, the return path 1 for hot and cold for which adaptability to the movement of the movable wall 2 is required.
A deformable flexible tube is used for the introduction passages 1 and 17 and the heating and cooling passages 13 and 23, and the heating means 14 and the cooling means 22 are provided with a water heater or a refrigerator, or a solar heat or an atmospheric radiation cooler. The heat source is not limited as long as it can appropriately supply hot and cold heat, such as natural energy, industrial waste heat, and urban waste heat.

The movable wall 2 has at least each of the regions 7 and 8.
2 and 3, the interior of the movable wall 2 communicates with the regions 7 and 8 provided on the wall, as shown in FIGS. A hollow heat storage region 3 is formed in which a part of the heat storage material in those regions 7 and 8 flows in through the flow holes 4a and 4b.

The heat storage area 3 has a flow hole 4 therein.
Temperature stratum forming means for suppressing the natural convection of the heat storage material flowing from a and 4b to form a temperature stratum between hot and cold heat is provided. In the case of this embodiment, a liquid absorbing material 5 made of a polymer material is used as the temperature hierarchy forming means, and the apparent viscosity is increased by absorbing the heat storage material flowing into the heat storage region 3. In addition, the flow holes 4a,
4b is formed in a mesh net shape smaller than the diameter of the liquid-absorbing substance 5 so that only water as a heat storage material easily passes so that the liquid-absorbing substance 5 does not flow out. As the liquid-absorbing substance 5, not only a polymer but also a substance having various liquid-absorbing properties, for example, a cotton thread or a sponge can be used.

Inside the heat storage area 3, two barriers 6 are provided to physically prevent the heat storage material from directly and largely moving in the heat storage area 3 in the vertical direction. These barriers 6 form a flow path of the heat storage material from one flow hole 4a to the other flow hole 4b in the heat storage area 3, and the flow path meanders from the flow hole 4a to form the flow hole 4b. , The barriers 6 are provided so as to be alternately positioned. The number of the barriers 6 may be one or three or more, and can be set to any number.

Next, the operation of the heat storage device configured as described above will be described. In the heat storage tank 1 partitioned by the movable wall 2 into a warm region 7 and a cool region 8, both regions 7 and 8 can simultaneously store warm and cool heat, respectively. At this time, the heat storage region 3 of the movable wall 2 sandwiched between the warm region 7 and the cool region 8 has a mesh mesh flow hole 4.
Water as a heat storage material flows from a and 4b, and stays in the heat storage region 3 while being absorbed by the liquid absorbing material 5 in the heat storage region 3. With the passage of time, the water located on the side closer to the thermal region 7 in the thermal storage region 3
The temperature of the existing heat in the warm area 7 approaches the temperature of the existing heat due to the inflow of heat from the water, while the water located on the side closer to the cool area 8 approaches the temperature of the cool heat in the cool area 8 due to the outflow of the heat from the flow holes 4b. . As a result, in the heat storage region 3, a temperature difference occurs between the heat storage material closer to the warm region 7 and the heat storage material closer to the cool region 8. If the liquid-absorbing substance 5 forming the temperature hierarchy forming means does not exist, heat transfer due to natural convection easily occurs in the water in the heat storage region 3, and therefore, the water existing in the heat storage region 3. Is almost eliminated, and thereby the temperature of the water in the heat storage area 3 tends to be almost the middle temperature between the hot water and the cold water. However,
In the present embodiment, the apparent viscosity of water is increased by the liquid-absorbing substance 5 contained in the heat storage region 3, natural convection in water in the heat storage region 3 is suppressed, and the barrier 6 As a result, unnecessary heat transfer due to natural convection is suppressed, and as a result, a temperature hierarchy is formed in the heat storage tank 1 between the hot temperature and the cold temperature.

In such a heat storage device in which a temperature hierarchy is established between the temperature of hot and the temperature of cold, when the heat is required, the pump 12 is used to send the heat from the heat delivery path 9. After the hot water is drawn out and used in the heat utilization facility 10, it is returned to the heat area 7 through the heat return path 11. Although the temperature of the water in the heating area 7 decreases due to the utilization of heat,
The water in this area 7 is supplied to a heating outflow path 13 by using a pump 16.
To the heating means 14, and after reheating, the water is returned from the heating introduction path 13 to the heating area 7, whereby the heating area 7
Is maintained at an appropriate temperature. Similarly, in the case where cold heat is required, cold water is extracted from the cold heat delivery path 19 using the pump 20 and used in the cold heat utilization equipment 18, and then returned to the cold heat return path 17.
To return to the cooling / heating area 8. Although the temperature of the water in the cold region 8 rises due to the utilization of the cold heat, the water is guided from the cooling outlet line 23 to the cooling means 22 by using the pump 24, and after re-cooling, the water is removed from the cooling inlet passage 21. By returning the temperature to 8, the cold region 8 is maintained at an appropriate temperature.

Next, a case will be described in which the required amount of heat and the required amount of cold change, and the ratio of the volume of the hot region 7 to the cool region 8 in the heat storage tank 1 is changed. For example, when increasing the volume of the cooling / heating area 8, the movable wall 2 is moved upward. At this time, a part of the warm water in the warm region 7 enters the heat storage region 3 of the movable wall 2 through the upper circulation hole 4a. Along with this, the water that was originally in the heat storage area 3 is pushed out by the flowing hot water and is
It moves to the b side, and flows out to the cold / hot area 8 through the circulation hole 4b. In this case, since the water in the heat storage region 3 is warmer as it is closer to the flow hole 4a on the warming region 7 side and cooler as it is closer to the flow hole 4b on the cold region 8, the temperature of the cold region 8 is lower. From the water closer to the cooling zone 8. Conversely, when increasing the heating area 7, the basic operation is the same as described above, except that the direction in which the water flows is reversed, and the water closer to the temperature of the heating area 7 is sequentially moved to the heating area 7. It will be pushed out. Therefore, unlike the related art, it is not necessary to use large energy for warming or cooling water having extremely different temperatures when changing the hot region 7 and the cold region 8.
Since there is no need for a facility to temporarily take out and store the excess water generated with the ratio of the volume of 8,
An increase in the size of the entire heat storage device can be suppressed.

In the heat storage device of this embodiment, even if the water in the heat storage region 3 flows out to the hot region 7 or the cold region 8,
Since the flow holes 4a and 4b have a structure that does not allow the liquid-absorbing substance 5 to flow out of the heat storage area 3, the heat storage effect of the heat storage area 3 due to repeated use is not impaired. In addition, movable wall 2
By adjusting the substantial capacity of the heat storage area 3 by changing the overall thickness, it is possible to adapt to the changed volume of each of the areas 7 and 8.

When the fluid heat storage material is used as a heat exchange medium, a capsule filled with a phase-change substance such as paraffin or inorganic hydrate is placed in a heating zone 7.
Alternatively, it is also possible to store the heat in the cold region 8. In addition, the inlets of the hot and cold delivery passages 9 and 19, and the hot and cold introduction passages 13 and 23 are formed as openings through which the liquid-absorbing substance 5 cannot pass. 8, it is possible to disperse the absorbent material 5
Thereby, natural convection in the warm region 7 and the cool region 8 can be suppressed, so that the heat storage effect of the warm and cool regions in the regions 7 and 8 can be enhanced.

[Embodiment 2] FIG. 4 is a sectional view of a movable wall 2 used in Embodiment 2. In the first embodiment, as the temperature tier forming means accommodated in the heat storage region 3,
Although the polymer liquid absorbing material 5 is used, in this embodiment,
Instead of the liquid absorbing material 5, a capsule 25 in which a heat storage material is sealed in a small container is used as a second heat storage material. That is, the movable wall 2 of this embodiment accommodates a large number of the capsules 25 in the heat storage area 3 therein, and the capsule 25 stores the flow holes 4a and 4b communicating with the respective areas provided on the wall surface of the movable wall 2. It is formed so as not to flow out of the region 3. Other configurations are the same as those in the first embodiment.

The heat storage device provided with the movable wall 2 having the above-described structure includes:
Although the basic operation is the same as that of the first embodiment, in this embodiment, the heat storage material present in the hot region 7 and the cold region 8 and the heat storage material sealed in the small container may not be the same material. Therefore, a phase change heat storage material such as paraffin or inorganic hydrate can be used in the capsule 25.

The heat storage device having the movable wall 2 configured as described above is advantageous when the relative change in the volume ratio between the hot region 7 and the cold region 8 is larger than the capacity of the heat storage region 3. It is. In the first embodiment, when the amount of change in the volume ratio between the hot region 7 and the cold region 8 is larger than the capacity of the heat storage region 3, the heat storage material that first exists in the heat storage region 3 due to the movement of the movable wall 2. Are all extruded into the warm region 7 or the cool region 8 which increases the proportion of the volume, and thereafter,
The heat storage material that has flowed into the heat storage region 3 when the ratio of the volume is changed from the cold region 8 or the warm region 7 passes through the heat storage region 3 and is sent out to the warm region 7 or the cool region 8. In this case, since the movable wall 2 and the high-molecular liquid-absorbing substance 5 in the case of the first embodiment cannot have such a large heat capacity, after the heat storage material originally existing in the heat storage area 3 has run out, the heat storage area 3 There is not much heat exchange between the heat storage material flowing into the movable wall 2 and the polymer liquid absorbing material 5 in the movable wall 2, and therefore, the heat storage material sent from the heat storage region 3 to the warm heat region 7 or the cool heat region 8. Is not so different from the original temperature of the cooling region 8 or the heating region 7. That is, in the movable wall 2 of the first embodiment, the heat storage region 3
Although the heat storage material having a temperature close to the required temperature can be secured for the capacity of, the heat storage material having a temperature close to the required temperature which is equal to or larger than the capacity cannot be secured.

On the other hand, when the capsule 25 of this embodiment is used as the second heat storage material, depending on the heat storage material sealed in the small container, the heat capacity is larger than that of the movable wall 2 or the polymer liquid absorbing material 5. Therefore, the heat storage effect in the heat storage area 3 can be maintained, whereby the heat storage material sent from the warm area 7 or the cold area 8 to the heat storage area 3 with the movement of the movable wall 2 can be used as the heat storage area. Since heat can be exchanged with the capsule 25 when passing through 3,
It is possible to secure a heat storage material having a temperature close to the required temperature and an amount equal to or larger than the capacity of the heat storage region 3, and to transfer a large amount of heat storage material due to a change in the volume ratio of the regions 7 and 8. Can also be adapted.

In this embodiment, the capsule 25 having a single characteristic is used.
However, the capsule 25 may be made of a material having different characteristics. For example, when the temperature of the warm region 7 and the temperature of the cool region 8 are substantially constant, the transition point of the movable wall 2 near the warm region 7 in the heat storage region 3 is set to a temperature slightly lower than the temperature of the warm region 7. A capsule 25 sealed with a heat storage material is provided, and a capsule 25 sealed with a heat storage material having a transition point at a temperature slightly higher than the temperature of the cold region 8 is provided in a portion close to the cold region 8. In addition to the above, the region between the cooling region 8 and the heating region 7
If the capsule 25 sealed with the heat storage material whose transition point is gradually increased toward the side is arranged, when the heat storage material moves between the heat storage region 7 side and the cold heat region 8 side in the heat storage region 3, A large transition energy having a different temperature can be used for each capsule 25, and a large amount of the heat storage material having a small temperature difference from the destination can be moved.

Embodiment 3 In Embodiment 2 described above, the movable wall 2
As the second heat storage material accommodated in the heat storage area 3 in the inside, a capsule 25 in which a heat storage material is sealed in a small container was used. In this embodiment, however, as shown in FIG. A liquid solid member is used. That is, the movable wall 2 of the present embodiment fixes the heat storage grid 26 formed of a material having a large heat capacity and a stable shape, such as metal, resin, or ceramic, to the heat storage area 3 in the movable wall 2. It is configured to be arranged in a typical manner. Other configurations are the same as those in the first and second embodiments.

In the movable wall 2 configured as described above, not only the grid 26 itself functions in the same manner as the second heat storage material of the second embodiment, but also the heat storage material flowing into the heat storage region 3 inside the grid 26. Since the heat storage material can be made to stay and the apparent viscosity of the heat storage material can be increased, the effects of Embodiment 1 and Embodiment 2
Can be combined. Also, this grid 26
Can be easily fixed to the movable wall 2, and the size and location of the flow holes 4a and 4b in the wall surface of the movable wall 2 can be set arbitrarily.

[0027]

As described above in detail, the heat storage device of the present invention forms a heat storage region for taking in a part of the heat storage material in the hot or cold region and storing the heat in the movable wall, and also forms the heat storage region in the heat storage region. In addition, since the temperature layer forming means for suppressing the convection of the heat storage material that has flowed in and forming a temperature layer between the hot heat and the cold heat is provided, the heat storage material in the heat storage region has a temperature of the heat region on the side of the heat region. Nearly, on the contrary, the heat storage area side is stored heat in a state close to the temperature of the cold heat, so that when the ratio of the volume of the warm area and the cold area is changed, the heat storage material flowing from one area into the heat storage area causes the other. Since the heat storage material close to the heat storage material temperature of the region is extruded into the region, as a result, the temperature change in each region due to the change in the volume ratio is small. Therefore, it is not necessary to input large heat energy from the outside to convert the temperature of the heat storage material as in the related art, and the volume of each region can be easily and quickly changed,
In addition, since there is no need for a facility for temporarily taking out the excess heat storage material to the outside and storing it, it is possible to suppress an increase in the size of the entire heat storage device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a heat storage device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration example of a movable wall according to the first embodiment of the present invention.

FIG. 3 is a top view of the movable wall of FIG. 2;

FIG. 4 is a cross-sectional view illustrating a configuration example of a movable wall used in a second embodiment of the heat storage device according to the present invention.

FIG. 5 is a cross-sectional view illustrating a configuration example of a movable wall used in a heat storage device according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a conventional heat storage device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat storage tank 2 Movable wall 3 Heat storage area 4a, 4b Flow hole 7 Hot area 8 Cold area

Claims (4)

(57) [Claims] A movable wall is provided in a heat storage tank filled with a heat storage material for storing given heat, the movable wall dividing the inside of the tank into regions for storing hot and cold heat, respectively. In the heat storage device in which the ratio of the volume of each region can be changed by allowing the movable wall to move by an external force in the heat storage tank, the wall facing each region of the movable wall has heat insulation, and the movable wall has Inside, a heat storage region that takes in a part of the heat storage material in the region through a communication hole communicating with each region provided on the wall surface is formed, and in the heat storage region, convection of the heat storage material flowing from the communication hole is suppressed. A heat stratum forming means for forming a temperature stratum between hot heat and cold heat. 2. The heat storage device according to claim 1, wherein the temperature layer forming means is formed by a liquid-absorbing substance, and the flow holes are formed by holes from which the liquid-absorbing substance does not flow. 3. The heat storage device according to claim 1, wherein the temperature layer forming means is formed of a second heat storage material.
A flow hole formed by a hole from which the second heat storage material does not flow. 4. The heat storage device according to claim 1, wherein the temperature hierarchy forming means is formed of a solid member having liquid permeability and heat storage property fixedly disposed in a heat storage area in the movable wall.