JPS5941421Y2 - Cooling heat storage tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling heat storage tank used in electric wire cooling systems and the like.

In conventional cooling heat storage tanks, a heat insulating material is placed around the outer periphery of the tank body to prevent heat transfer between the cooling medium inside the tank chamber of the tank body and the earth outside the tank.

However, although insulating materials have the advantage of not transmitting heat from the ground to the cooling medium, they have the disadvantage that they do not have the ability to dissipate or cool down the cooling medium when its temperature rises.

Furthermore, when cooling electric wires, for example, with a cooling heat storage tank that utilizes sensible heat such as water, there is a drawback that a large volume cooling heat storage tank is required.

For example, a base with a capacity of 800 tons requires a tank capacity of about 900 tons.

If the tank becomes large, it becomes difficult to secure a space for its installation, and a large amount of construction cost is required, which is undesirable.

An object of the present invention is to provide a cooling heat storage tank that can exchange heat with the earth and reduce the volume of the tank.

The present invention relates to a cooling heat storage tank in which a cooling medium is housed in a tank chamber of a tank body buried in the ground, in which a cavity is provided in the tank body adjacent to the inner and outer surfaces of the tank body. A heat storage material that uses latent heat is housed in the cavity, and the inner surface of the tank body is a non-insulated surface that can exchange heat with the cooling medium inside the tank chamber, and the outer surface of the tank body can exchange heat with the earth. It is characterized by being a non-insulating surface.

When the temperature of the cooling medium increases, such a cooling heat storage tank cools the tank by exchanging heat with the heat storage material in the tank body and absorbing the heat storage material as heat that changes state.

In addition, when the temperature of the cooling medium in the tank body is above 0 and the state of the heat storage material changes accordingly, the specific heat of the heat storage material becomes smaller and the thermal conductivity improves, and the heat of the cooling medium is transferred. Heat is radiated to the earth via the heat storage material.

Conversely, heat that attempts to enter the tank chamber from the ground is absorbed by the latent heat storage material as state-changing heat, thereby preventing heat from the ground from being transferred to the cooling medium.

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

As shown in the figure, the cooling heat storage tank of this embodiment has a box-shaped tank main body 1 with an open top, and the tank main body 1 is entirely or partially buried in the ground.

The tank chamber of the tank body 1 is partitioned by a plurality of partition walls 2A, 2B, and 2C, and divided into a plurality of heat storage chambers 3A, 3B, 3C, and 3D.

A cooling medium 5 such as water is accommodated in the tank chamber of the tank body 1 .

The inner surface of the tank body 1 is a non-insulated surface capable of exchanging heat with the cooling medium 5, and the outer surface is a non-insulated surface capable of exchanging heat with the earth.

The adjacent heat storage chambers 3A to 3D are sequentially communicated through communication holes 4A, 4B, and 4C that are vertically and alternately bored in the partition walls 2A to 2C, so that the cooling medium 5 in the tank chamber of the tank body 1 flows as shown by the arrows. It gradually flows into the adjacent heat storage chamber.

In order to cool down the coolant 5 whose temperature has increased, a cooler 6 is installed outside the tank body 1, and the cooler 6 is located at the beginning and end of the heat storage chamber 3A in the direction in which the coolant 5 flows.

3D through piping 7, 8, and a pump 9 is connected to the piping 7 side to pump up the cooling medium 5 in the heat storage chamber 3A and return it to the heat storage chamber 3IM.

A cavity 10 is provided throughout the tank body 1 adjacent to the inner and outer surfaces of the tank body 1, and a heat storage material 11 utilizing latent heat is accommodated within the cavity 10.

The heat storage chambers 3D and 3A at the terminal and starting ends are connected to both ends of a heat exchange path 14 with a cable as a load through piping 12°13,
The cooling medium 5 is configured to circulate and flow through this heat exchange path 14.

A pump 15 is connected to the piping 12 side.

For example, the following materials are used as the heat storage material 11 that utilizes latent heat.

In such a cooling heat storage tank, the heat that tries to enter the tank chamber from the ground outside the tank body 1.

The heat storage material 11 that utilizes latent heat is absorbed as heat that changes its state from solid to liquid, and prevents the temperature of the cooling medium 5 from rising due to heat from the earth.

In this state, the cable side generates heat and operates the cable side pump 15, and when the cooler 6 is stopped, the cooling medium 5 flows in the tank body 1 in the direction of the arrow.

In this case, since the heat storage material 11 that utilizes latent heat is placed in the tank body 1, heat is exchanged on the inner surface of the tank body 1 due to the state change of the heat storage material 11 from solid to liquid, and the cooling medium 5 is cooled. is sent from the heat storage chamber 3D to the cable side.

When the cable side generates more heat and the temperature of the cooling medium 5 rises, the heat storage material 11 changes state and becomes liquid, has a small specific heat, and has good thermal conductivity, so the heat of the cooling medium 5 is transferred to the heat storage material 11. Heat is radiated to the ground outside the tank body 1 through the tank body 1.

In addition, in this state, the cooler 6 is operated, the cooling medium 5 in the heat storage chamber 3A is sucked up, cooled by the cooling device 6, and supplied to the heat storage chamber 3D. 5 is sent to the cable side to cool the cable.

Furthermore, in this state, the cooling medium 5 in the tank body 1 flows in the direction opposite to the arrow, and is cooled entirely.

When the temperature of the cooling medium 5 falls below the freezing point of the heat storage material 11, the liquefied heat storage material 11 returns to a solid state.

Note that the operation of returning the liquefied heat storage material to a solid state is not limited to the above example, and it is also possible to remove the liquefied heat storage material and replenish the tank body 1 with a new solid heat storage material instead. good.

In addition, heat storage materials that utilize latent heat are not limited to those listed above, but include those that change state from liquid to gas;
Alternatively, a material whose state changes from solid to gas can also be used.

For example, in the case of a heat storage material that changes state from liquid to gas, the gaseous heat storage material is taken out of the tank body, cooled by a cooler, returned to liquid, and then returned to the tank body. You can also.

As explained above, the cooling heat storage tank according to the present invention has a cavity provided in the tank body adjacent to the inner and outer surfaces of the tank body, and a heat storage material utilizing latent heat is housed in the cavity. Since the outer surface of the tank body is a non-insulated surface that can exchange heat with the ground, heat that attempts to enter the tank chamber from the ground outside the tank body is absorbed by the heat storage material that uses latent heat as heat that changes state. However, it is possible to prevent the temperature of the cooling medium in the chamber from rising due to heat from the earth.

In addition, the inner surface of the tank body is a non-insulated surface that can exchange heat with the cooling medium, so if the temperature of the cooling medium inside the tank rises and the state of the heat storage material changes accordingly, the heat storage material will The specific heat of the material is reduced, the thermal conductivity is improved, and the heat of the cooling medium can be radiated to the earth via this heat storage material.

Further, according to the present invention, the cooling medium can be cooled using the latent heat of the heat storage material, and the amount of heat stored in the cooling heat storage tank can be increased.

Therefore, if a cooling heat storage tank with the same amount of heat storage is made according to the present invention, the tank volume can be made smaller than that of the conventional tank, land can be easily secured, and construction costs can be reduced.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the cooling heat storage tank according to the present invention. 1... Tank body, 5... Cooling medium, 10
...Cavity, 11... Heat storage material.

Claims (1)

[Scope of utility model registration request] In a cooling heat storage tank in which a cooling medium is housed in a tank chamber of a tank main body buried in the ground, a cavity is provided in the tank main body adjacent to an inner surface and an outer surface of the tank main body, and a cavity is provided in the tank main body adjacent to the inner surface and outer surface of the tank main body. A heat storage material utilizing latent heat is housed inside, the inner surface of the tank body is a non-insulated surface that can exchange heat with the cooling medium, and the outer surface of the tank body can exchange heat with the ground. A cooling heat storage tank characterized by having a non-insulated surface.