JP2022134325A - Heat storage release device - Google Patents

Abstract

To provide a heat storage release device excellent in energy efficiency.SOLUTION: A heat storage release device 1 comprises a heat storage release material 2 which stores heat by raising temperature and releases heat by pressurizing, and a pressurizing member 3 having a liner expansion coefficient different from that of the heat storage release material 2, and is constituted such that a pressurizing force which reacts to the heat storage release material 2 from the pressurizing member 3 becomes higher accompanied by lowering temperature.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a heat storage device.

In recent years, heat-storage and heat-dissipating materials, such as trititanium pentoxide (Ti ₃ O ₅ ), have been developed that release heat under pressure. Patent document 1 discloses an exhaust post-treatment system using such a heat-storage material. Then, in the system described in Patent Document 1, when the temperature of the exhaust gas drops, pressure is applied to the heat storage material to increase the temperature of the exhaust gas.

Japanese Patent Application Laid-Open No. 2018-62906

However, in the system described in Patent Literature 1, pressure is applied to the heat storage material by a piezoelectric material or the like.
In other words, external energy is used when heat is radiated from the heat accumulating material. Therefore, it can be said that there is room for improving the energy efficiency in the above system.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object thereof is to provide a heat storage and release device with excellent energy efficiency.

One aspect of the present invention is a heat storage/radiation material (2) that stores heat by increasing the temperature and releases heat by being pressurized;
a pressurizing member (3) having a coefficient of linear expansion different from that of the heat storage material;
A heat storage/radiation device (1) configured so that the pressure applied from the pressure member to the heat storage/radiation material increases as the temperature decreases.

The heat storage/radiation device is configured such that the pressure applied from the pressure member to the heat storage/radiation material increases as the temperature decreases. As a result, heat is released from the heat storage material when the temperature drops. Therefore, it is not necessary to actively apply external energy to take out the heat stored in the heat storage/radiation material when the temperature is high, from the heat storage/radiation material when the temperature is low. Therefore, it is possible to obtain a heat storage and release device with excellent energy efficiency.

As described above, according to the above aspect, it is possible to provide a heat storage and release device with excellent energy efficiency.
It should be noted that the symbols in parentheses described in the claims and the means for solving the problems indicate the corresponding relationship with the specific means described in the embodiments described later, and limit the technical scope of the present invention. not a thing

FIG. 2 is a cross-sectional explanatory diagram of the heat storage and heat dissipation device in Embodiment 1; FIG. 2 is a perspective explanatory view of the heat storage and heat dissipation device in Embodiment 1; FIG. 2 is an explanatory diagram showing an example of how to use the heat storage and heat dissipation device according to the first embodiment; Cross-sectional explanatory drawing of the heat storage/radiation device in Embodiment 2. FIG. Cross-sectional explanatory drawing of the heat storage/radiation device in Embodiment 3. FIG. FIG. 8 is a cross-sectional explanatory view of the heat storage and heat storage device in Embodiment 4, and is a cross-sectional view taken along the line VI-VI of FIG. 7; VII-VII line cross-sectional explanatory drawing of FIG. FIG. 10 is an explanatory cross-sectional view of the heat storage and heat dissipation device in Embodiment 5, and is an explanatory cross-sectional view taken along the line VIII-VIII of FIG. 9; FIG. 8 is an explanatory cross-sectional view taken along line IX-IX of FIG. FIG. 11 is an explanatory diagram showing an example of a usage method of a heat storage and heat dissipation device according to Embodiment 5; FIG. 11 is a diagram showing an example of temperature change of cooling water according to the fifth embodiment; FIG. 14 is a cross-sectional explanatory view of the heat storage and heat storage device in Embodiment 6, and is a cross-sectional view taken along the line XII-XII of FIG. 13; XIII-XIII cross-section explanatory drawing of FIG.

(Embodiment 1)
An embodiment of a heat storage/radiation device will be described with reference to FIGS. 1 to 3. FIG.
A heat storage device 1 of this embodiment has a heat storage material 2 and a pressure member 3 as shown in FIG. The heat storage/radiation material 2 stores heat by increasing its temperature and releases heat by being pressurized. The pressure member 3 has a linear expansion coefficient different from that of the heat storage/radiation material 2 .
The heat storage/radiation device 1 is configured such that the pressure applied from the pressure member 3 to the heat storage/radiation material 2 increases as the temperature decreases.

In this embodiment, the heat storage/radiation material 2 contains heat storage/radiation titanium oxide having a property of storing heat with the phase transition from the β phase to the λ phase and dissipating heat with the phase transition from the λ phase to the β phase. The heat-storage titanium oxide undergoes a phase transition from the β phase to the λ phase when heated to a phase transition temperature or higher, and undergoes a phase transition from the λ phase to the β phase when pressurized to a phase transition pressure or higher. Specifically, a trititanium pentoxide-based material is used as such a heat-storage/release titanium oxide. The trititanium pentoxide-based material is a material mainly composed of trititanium pentoxide having a composition of Ti ₃ O ₅ . In addition, the phase transition temperature and the phase transition pressure of this heat-storage titanium oxide can be appropriately adjusted by adjusting the composition of the additive.

In this embodiment, the pressure member 3 has a larger coefficient of linear expansion than the heat storage/radiation material 2 . The pressure member 3 can be, for example, a metal member such as stainless steel, or a ceramic member. More specifically, for example, SUS304 or the like can be used as the pressure member 3 . In this case, the linear expansion coefficient of the pressurizing member 3 can be about 10 to 18×10 ^-6 /K. On the other hand, the coefficient of linear expansion of the heat storage material 2 can be about 7 to 10×10 ⁻⁶ /K.

In this embodiment, the heat storage and heat device 1 can have a substantially cubic shape or a substantially rectangular parallelepiped shape as shown in FIG. The shape of the heat storage/radiation device 1 is not limited to these, and may be other shapes such as a substantially spherical shape and a substantially cylindrical shape. A pressure member 3 is formed so as to surround the outer periphery of the heat storage material 2 from all directions. Conversely, the heat storage material 2 is filled inside the housing as the pressure member 3 . In this embodiment, the heat storage material 2 is in powder form and filled inside the pressure member 3 .

By configuring the heat storage/radiation device 1 in this manner, it is possible to configure such that the pressure applied from the pressure member 3 to the heat storage/radiation material 2 increases as the temperature decreases. In other words, when the temperature of the heat storage/radiation device 1 drops below a predetermined temperature, a pressurizing force equal to or greater than the phase transition pressure can be applied from the pressing member 3 to the heat storage/radiation material 2 . As a result, when the temperature of the heat storage/radiation device 1 drops below a predetermined temperature, the heat storage/radiation material 2 can radiate heat and the heat can be taken out.

The heat storage device 1 of this embodiment can be used, for example, in a cooling water circulation system 4 as shown in FIG.
The cooling water circulation system 4 is, for example, a system for cooling the machine tool 41 by circulating cooling water in the machine tool 41 . The cooling water circulation system 4 has a tank 42 , a feed pipe 43 and a return pipe 44 . The tank 42 stores the cooling water C. A feed pipe 43 feeds the cooling water C from the tank 42 to the machine tool 41 . A return pipe 44 returns cooling water C from the machine tool 41 to the tank 42 . A pump 431 is provided in the feed pipe 43 .

During operation of the machine tool 41 , the pump 431 is operated and the cooling water C circulates between the tank 42 and the machine tool 41 . In the tank 42, the temperature of the cooling water C is adjusted within a predetermined temperature range by a temperature control system (not shown).

The heat storage device 1 can be put into the tank 42 of the cooling water circulation system 4 configured in this way and used. That is, the heat storage device 1 is submerged in the cooling water C stored in the tank 42 . In this embodiment, a plurality of heat storage and heat dissipation devices 1 are introduced.

By doing so, heat exchange is performed between the cooling water C in the tank 42 and the heat storage/radiation device 1 . For example, when the machine tool 41 is in operation, i.e., when the cooling water circulation system 4 is in operation, cooling water having a relatively high temperature is returned to the tank 42 through the return pipe 44, so the temperature of the cooling water C in the tank 42 increases. . As a result, the temperature of the heat storage/radiation device 1 also rises, and heat is stored in the heat storage/radiation material 2 .

On the other hand, for example, when the machine tool 41 is stopped for a certain period of time or more, such as at night, and the cooling water circulation system 4 is stopped, the temperature in the tank 42 decreases. In particular, in cold regions or in winter, there is concern that the temperature of the cooling water C may drop too much. In some cases, there is concern that the cooling water C may freeze.

As described above, when the temperature of the cooling water C in the tank 42 is lowered, the temperature of the heat storage device 1 is also lowered. Along with this, the volume of the pressure member 3 of the heat storage device 1 shrinks. The volumetric shrinkage of the pressurizing member 3 is greater than that of the heat storage/radiating material 2 arranged inside. Therefore, pressure is generated from the pressure member 3 to the heat storage/radiation material 2, and the pressure increases. When this pressure becomes equal to or higher than the phase transition pressure of the heat storage/radiation material 2, the heat storage/radiation material 2 starts releasing heat. As a result, heat is imparted from the heat storage/radiation device 1 to the cooling water C surrounding it. Thereby, the temperature of the cooling water C can be raised.

As described above, the phase transition temperature of the heat storage/radiating material 2 can be adjusted by adjusting the composition of additives and the like. For example, if the phase transition temperature of the heat storage/radiation material 2 is 60° C., the heat of the cooling water C can be stored in the heat storage/radiation device 1 when the temperature of the cooling water C reaches 60° C. or higher.

It is also possible to adjust the temperature at which the pressurizing force acting on the heat storage/radiating material 2 becomes the phase transition pressure. This can be achieved, for example, by adjusting the filling density of the heat storage/radiation material 2 with respect to the pressure member 3 . Alternatively, by adjusting the composition of the heat storage/radiation material 2 or the composition of the pressing member 3, it is possible to adjust the temperature at which the pressure acting on the heat/storage material 2 becomes the phase transition pressure.

If the temperature at which the pressurizing force acting on the heat-storage material 2 becomes the phase transition pressure is set to, for example, 0°C, the heat-storage material 2 releases heat when the temperature of the cooling water C reaches 0°C. , can give heat to the cooling water C. In this case, cooling water C can be prevented from freezing.

Next, the effects of this embodiment will be described.
The heat storage/radiation device 1 is constructed so that the pressure applied from the pressing member 3 to the heat storage/radiation material 2 increases as the temperature decreases. As a result, heat is radiated from the heat storage/radiation material 2 when the temperature drops. Therefore, it is not necessary to actively apply external energy to take out the heat stored in the heat storage/radiation material 2 at a high temperature from the heat storage/radiation material 2 at a low temperature. Therefore, it is possible to obtain the heat storage and release device 1 with excellent energy efficiency.

Considering the case of using the heat storage/radiation device 1 in the cooling water circulation system 4, part of the heat of the cooling water can be stored in the heat storage/radiation device 1 when the temperature of the cooling water is high. Then, when the temperature of the cooling water drops, pressure is applied to the heat storage material 2 in the heat storage device 1 to radiate heat. As a result, when the temperature of the cooling water becomes low, heat can be imparted from the heat storage/radiating material 2 to the cooling water. Such appropriate heat storage and heat dissipation can be achieved without actively applying energy from the outside.

Moreover, since the pressurizing member 3 surrounds the heat storage/radiation material 2 in the heat storage/radiation device 1 of the present embodiment, appropriate heat storage and heat dissipation can be easily performed with a simple structure.

As described above, according to this embodiment, it is possible to provide a heat storage and release device with excellent energy efficiency.

(Embodiment 2)
As shown in FIG. 4, this embodiment is a heat storage device 1 in which a pressure member 3 is arranged inside a heat storage material 2. As shown in FIG.

In this case, the heat storage material 2 can be solid instead of powder. Further, in the case of this embodiment, the linear expansion coefficient of the pressure member 3 is made smaller than the linear expansion coefficient of the heat storage material 2 . As a result, when the temperature drops, the pressurizing force of the pressurizing member 3 acts from the inside of the heat storage material 2 . As a result, the heat stored in the heat storage/radiation material 2 can be taken out at low temperatures.

Others are the same as those of the first embodiment. Note that, of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the previous embodiments represent the same components as those in the previous embodiments, unless otherwise specified.

In the case of this embodiment as well, it is possible to provide a heat storage and release device with excellent energy efficiency. In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
In this embodiment, as shown in FIG. 5, the pressurizing member 3 is arranged so as to surround the outer periphery of the heat storage material 2, and the inner member 5 is provided inside the heat storage material 2. As shown in FIG.
The pressure member 3 has a linear expansion coefficient larger than that of the inner member 5 . In this embodiment, for example, the pressure member 3 can be made of SUS304, and the inner member 5 can be made of a titanium alloy. In this case, the linear expansion coefficient of the pressure member 3 can be about 16 to 18×10 ⁻⁶ /K, and the linear expansion coefficient of the inner member 5 can be about 8 to 10×10 ⁻⁶ /K.

The heat storage material 2 is arranged in the space between the inner member 5 and the pressure member 3 . In this embodiment, the inner member 5 has a hollow shape. In this case, heat exchange objects such as cooling water and cooling oil can be circulated through the hollow portion 51 of the inner member 5 . Also, the inner member 5 can be solid.
Others are the same as those of the first embodiment.

In this embodiment, when the temperature drops, the space between the pressure member 3 and the inner member 5 tends to narrow. Therefore, the heat storage material 2 is pressurized so as to be sandwiched between the pressurizing member 3 and the inner member 5 at low temperatures. This makes it easier for heat to be released from the heat storage/radiation material 2 more effectively.

In addition, the linear expansion coefficient of the inner member 5 can be made smaller than that of the heat storage material 2 . In this case, it is possible to particularly increase the pressure applied to the heat storage/radiation material 2 from the inside. In such a configuration, for example, a cobalt alloy or the like can be used as the inner member 5 . In this case, the coefficient of linear expansion of the inner member 5 can be about 4 to 6×10 ^-6 /K.

Further, when the inner member 5 is hollow, cooling water or the like to be subjected to heat exchange can be circulated through the hollow portion 51 . Thereby, heat exchange with the heat exchange object can be effectively performed.
Also, the inner member 5 can be, for example, a rotating shaft member. In such a case, the rotating shaft member can be heated at low temperatures.
In addition, it has the same effects as those of the first embodiment.

In the third embodiment, the coefficient of linear expansion of the pressure member 3 is larger than the coefficient of linear expansion of the inner member 5, but the coefficient of linear expansion of the pressure member 3 is equal to the coefficient of linear expansion of the inner member 5. , or can be slightly smaller. This is because when the pressure member 3 is arranged on the outer peripheral side, the surface area of the pressure member 3 becomes larger than that of the inner member 5, and the volume shrinkage amount of the pressure member 3 when the temperature drops may become large. be. In such a case, even if the coefficient of linear expansion of the pressure member 3 is not necessarily greater than that of the inner member 5, it is possible to obtain the same effect as described above.

(Embodiment 4)
As shown in FIGS. 6 and 7, this embodiment is a heat storage and radiation device 1 in which each of the heat and energy storage material 2, the pressure member 3, and the inner member 5 has a cylindrical shape.
The heat storage material 2, the pressure member 3, and the inner member 5 are arranged concentrically with each other when viewed from the axial direction thereof.

Inside the inner member 5, a cylindrical hollow portion is formed along the axial direction. An inner flow path 52 for circulating a fluid to be heat-exchanged may be arranged in this hollow portion. That is, the hollow portion of the inner member 5 can be used as an inner flow path 52 through which a fluid such as cooling water or cooling oil flows.
Others are the same as those of the third embodiment.

In this embodiment, the pressure applied from the pressure member 3 to the heat storage/radiation material 2 can be made uniform over the entire circumference. Therefore, at low temperatures, it becomes easier to dissipate heat uniformly from the entire heat storage and heat storage material 2 . Moreover, since the inner flow path 52 is provided inside the inner member 5 , heat exchange between the fluid flowing through the inner flow path 52 and the heat storage/radiating material 2 can be efficiently performed.
In addition, it has the same effects as those of the third embodiment.

(Embodiment 5)
In this embodiment, as shown in FIGS. 8 to 11, a pipe 61 is passed through the inside of the inner member 5 of the heat storage device 1. As shown in FIGS.
The pipe 61 has a cylindrical shape. A heat conductive sheet 62 is interposed between the pipe 61 and the inner member 5 . The heat conductive sheet 62 is also arranged in a cylindrical shape. The heat-conducting sheet 62 is made of silicone rubber, for example, and has excellent heat-conductivity and sufficient flexibility and elasticity. Further, as shown in FIG. 9 , annular stoppers 13 are arranged on both sides of the heat storage material 2 in the axial direction, and are crimped to the pressing member 3 .

In this embodiment, the inner space of the pipe 61 serves as the inner flow path 52 . The pipe 61 can be, for example, a cooling water pipe for circulating cooling water. Then, as schematically shown in FIG. 10, the pipe 61 can be connected to a cooling channel for cooling factory equipment 410 such as a machine tool.

A cooling system for factory equipment 410 shown in FIG. A heat storage device 1 is installed in a portion of the pipe 61 outside the building 63 . In particular, it is also useful to install the heat storage device 1 on the pipe 61 exposed on the north side of the building 63 of the factory.
Others are the same as those of the fourth embodiment.

In this embodiment, it is possible to attach the heat storage/radiation device 1 to an existing pipe or to connect a pipe integrated with the heat storage/radiation device 1 to an existing pipe.

By constructing a cooling water circulation system as shown in FIG. 10, for example, the following effects can be expected.
For example, when the operation of a factory is stopped at night or the like, the installation of the heat storage device 1 can prevent the temperature of cooling water from dropping too much during the period of stoppage. That is, there is concern that the temperature of the cooling water may drop too much, especially in cold regions or in winter. In some cases, there is concern that the cooling water in the pipe 61 may freeze. Such an excessive drop in cooling water can be prevented without particularly adding energy.

First, when the factory is in operation, the temperature of the cooling water in the pipe 61 increases as the cooling water circulates through the working factory equipment 410 and the pipe 61 . Therefore, part of the heat of the cooling water is stored in the heat storage/radiation material 2 of the heat storage/radiation device 1 during factory operation.

After that, when the factory stops, such as at night, the temperature of the cooling water drops. With this temperature drop, in the heat storage/radiation device 1, pressure is applied from the pressure member 3 to the heat storage/radiation material 2, and the heat stored in the heat storage/radiation material 2 is radiated. As a result, the cooling water in the pipe 61 passing through the inside of the heat storage/radiation device 1 receives heat. As a result, it is possible to prevent the temperature of the cooling water from dropping too much.

A curve L in FIG. 11 shows an image of the temperature change of the cooling water in the pipe 61 from the time when the factory is stopped until the heat dissipation of the heat storage device 1 . In the example shown in FIG. 11, the heat storage/radiation device 1 is designed so that the phase transition temperature of the heat storage/radiation material 2 is 60° C. and the temperature when the phase transition pressure acts on the heat storage/radiation material 2 is 0° C. It is assumed that there is

During factory operation, the temperature of the cooling water is higher than 60° C., which is the phase transition temperature of the heat storage material 2 . Therefore, heat is accumulated in the heat storage/radiation material 2 during this period. After that, when the operation of the factory stops and the circulation of the cooling water stops, the temperature of the cooling water gradually decreases. Then, when the temperature of the cooling water drops to 0° C., in the heat storage/radiation device 1, the pressurizing force from the pressurizing member 3 to the heat storage/radiation material 2 reaches the phase transition pressure. As a result, the heat storage/radiation material 2 releases heat, and the cooling water in the pipe 61 receives heat. Therefore, as shown by the curve portion L1 in FIG. 11, the temperature of the cooling water rises, and freezing of the cooling water can be avoided.

If the heat storage and heat dissipation device 1 were not installed, the temperature of the cooling water in the pipe 61 would fall below 0° C., as indicated by the dashed curve portion L2 in FIG. Become.
In addition, it has the same effects as those of the fourth embodiment.

(Embodiment 6)
As shown in FIGS. 12 and 13, in the heat storage/radiation device 1 of the present embodiment, the heat storage/radiation material 2 is disposed inside the cylindrical pressure member 3, and the heat exchange target is placed on the outer peripheral side of the pressure member 3. An outer flow path 11 is formed for circulating the fluid.

The pressurizing member 3 has a cylindrical shape, and the heat storage/radiating material 2 is arranged inside the cylindrical pressurizing member 3 . The pressure member 3 has a linear expansion coefficient larger than that of the heat storage/radiation material 2 . The outer flow path 11 is formed along the axial direction of the cylindrical pressure member 3 .

The outer flow path 11 is formed inside an outer peripheral cylindrical tube 12 arranged concentrically with the pressure member 3 . That is, the cylindrical space between the pressurizing member 3 and the outer cylindrical tube 12 serves as the outer flow path 11 .

The outer flow path 11 can circulate, for example, cooling water for cooling factory equipment and the like. The outer channel 11 can be connected to, for example, a cooling channel for cooling the factory equipment 410 shown in the fifth embodiment.
Others are the same as those of the first embodiment.

In this embodiment, when the temperature is lowered, pressure is applied from the pressure member 3 to the heat storage/radiation material 2 . As a result, the heat stored in the heat storage/radiation material 2 is radiated to the outer flow path 11 . Therefore, when the temperature is low, the heat of the heat storage/radiating material 2 can be used to heat the cooling water or the like in the outer flow path 11 .

Moreover, since the pressurizing member 3 has a cylindrical shape, the pressurizing force acting from the pressurizing member 3 on the heat storage/radiating material 2 can be made uniform over the entire circumference. Therefore, at low temperatures, it becomes easier to dissipate heat uniformly from the entire heat storage and heat storage material 2 .
In addition, it has the same effects as those of the first embodiment.
In Embodiment 6, the outer flow path 11 is formed along the entire outer periphery of the pressure member 3. You can also

The present invention is not limited to the above embodiments, and can be applied to various embodiments without departing from the scope of the invention.

1 heat storage device 2 heat storage material 3 pressure member

Claims (6)

a heat storage material (2) that stores heat by increasing its temperature and releases heat by being pressurized;
a pressurizing member (3) having a coefficient of linear expansion different from that of the heat storage material;
A heat storage/radiation device (1) configured so that the pressure applied from the pressure member to the heat storage/radiation material increases as the temperature decreases. 2. The heat storage and radiation device according to claim 1, wherein the pressure member is arranged to surround the outer periphery of the heat storage and radiation material, and an inner member (5) is provided inside the heat storage and radiation material. The heat storage/radiation device according to claim 2, wherein the heat storage/radiation material, the pressure member, and the inner member all have a cylindrical shape. The heat storage and release device according to claim 2 or 3, wherein an inner flow path (52) for circulating a fluid to be heat exchanged is arranged inside the inner member. The heat storage and release device according to any one of claims 2 to 4, wherein the pressure member has a coefficient of linear expansion larger than that of the inner member. The pressure member has a cylindrical shape, the heat storage/radiation material is disposed inside the cylindrical pressure member, the pressure member has a larger coefficient of linear expansion than the heat storage/radiation material, The storage device according to claim 1, wherein an outer flow path (11) for circulating a fluid to be heat-exchanged is formed along the axial direction of the pressurizing member on the outer peripheral side of the pressurizing member. heat dissipation device.

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