JPS6230432Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cable cooling device.

It is well known that the power transmission capacity of power cables is limited by the heat generated during power transmission, and for this reason, power cables have traditionally been cooled using various methods, but recently power cables have been increasing in capacity. As a result, cooling systems are also becoming larger. For example, when water is used as a cooling heat medium and a power cable is cooled by water that has been cooled to a predetermined temperature or lower by a refrigerator, the cooling is performed by the sensible heat of the water, so even if the specific heat of the water is Even though it is large, it requires a large amount of water, so a large-capacity heat storage water tank must be installed, and there is a desire to downsize the cooling device due to the recent difficulty in locating a cooling station.

Therefore, it is possible to increase the freezing capacity of the refrigerator and continuously cool the water, thereby reducing the amount of water required. In some cases, the power cable may not be able to be cooled immediately or its cooling capacity may decrease, leading to an increase in the temperature of the power cable and an associated serious accident.

This idea was made in view of the above circumstances, and the purpose is to provide a cooling device that can be downsized and can continue cooling even in the event of an emergency stop due to a refrigerator failure, etc. It is something to do.

Embodiments of this invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an embodiment of this invention, in which reference numeral 1 indicates a storage tank, and the storage tank 1 is for temporarily storing water 2 as a cooling heat medium. It is divided into three tanks: a water tank 3, a hot water tank 4, and a heat storage material 5 located between these tanks.
The heat storage tank 5 is filled with a latent heat storage material 6 for cooling. The latent heat storage material 6 stores so-called cooling energy that absorbs latent heat from the outside during melting or crystal dislocation.
400 polyethylene glycol (freezing point 6℃, heat of fusion 36cal/g, specific heat 0.49cal/g・℃, specific gravity
1.126) or polyethylene glycol with a molecular weight of 600 (freezing point 20.3°C, heat of fusion 35 cal/g, specific heat
0.52cal/g. It consists of an aqueous solution or an organic solvent solution at a temperature of 1.127 °C and a specific gravity of 1.127). Further, in the heat storage tank 5, a heat transfer tube 7 for transferring heat between the water 2 in the cold water tank 3 and the latent heat storage material 6 is provided so as to penetrate from the cold water tank 3 to the hot water tank 4. . In addition, since the water 2 flows between the cold water tank 3 and the hot water tank 4 via the heat transfer tube 7, the heat transfer tube 7 is a communication pipe for keeping the water levels of the cold water tank 3 and the hot water tank 4 at the same level. It has also come to function as

On the other hand, the cold water tank 3 is connected via a pump 9 to an inlet of a cable or a water cooling pipe 8 arranged in parallel to the cable, and an outlet of the water cooling pipe 8 is connected to the hot water tank 4. Therefore, the low temperature water 2 in the cold water tank 3 is sent to the water cooling pipe 8 by the pump 9, where the heat emitted from the cable is taken away by the water 2, and as a result, the water 2 whose temperature has increased
is configured to return the water to the hot water tank 4.

Furthermore, the hot water tank 4 is connected to the refrigerator 11 via another pump 10, and the water in the hot water tank 4 is transferred to the refrigerator 11.
After cooling to a predetermined temperature or lower by
It is now being supplied to

Next, to explain the operation of the device configured as above, water 2 is heated below the freezing point of the latent heat storage material 6 (6°C or lower in the case of polyethylene glycol with a molecular weight of 400, and 20.3°C in the case of polyethylene glycol with a molecular weight of 600). When cooled by the refrigerator 11 (below), the latent heat storage material 6 loses heat to the water 2 and solidifies. In this state, when the water 2 in the cold water tank 3 is sent to the water cooling pipe 8 by the pump 9, the water 2 flowing inside the water cooling pipe 8 absorbs the heat generated from the cable, that is, the cable is cooled, and as a result, the temperature decreases. The rising water 2 returns to the hot water tank 4. The heated water 2 in the hot water tank 4 is sent to the refrigerator 11 by the pump 10, where it is cooled to a desired temperature and then sent to the cold water tank 3. Therefore, under normal conditions, the cable is cooled by circulating the water 2 in the order of cold water tank 3 → water cooling pipe 8 → hot water tank 4 → refrigerator 11 → cold water tank 3. When the refrigerator 11 stops for some reason, the pump 10 also stops at the same time, and as a result, the water 2 in the hot water tank 4 flows into the water tank 3 via the heat transfer tube 7. In that case, while the water 2 whose temperature has increased in the hot water tank 4 flows through the heat transfer tube 7,
The latent heat storage material 6 removes heat and cools the water, and then the cooled water 2 is sent to the water cooling pipe 8 by the pump 9. Therefore, in the above device,
Even when the refrigerator 11 is stopped, the cable can be continuously cooled. In that case,
Since the latent heat storage material 6 stores cooling energy as sensible heat and latent heat, the cable can be cooled for a long time with a small capacity.

Here, when comparing the required capacity when using polyethylene glycol with a molecular weight of 400 as a latent heat storage material and when using water as in the conventional case, polyethylene glycol with a molecular weight of 400 has a high heat of fusion.
36 cal/g, and the specific heat is 0.49 cal/g. ℃, so for example, while rising from 5℃ to 15℃, per unit weight Q = (15-5) x 0.49 + 36 = 40.9cal of heat is absorbed, and if this is converted to per unit capacity, the specific gravity is
Since it is 1.126, it absorbs approximately 46 cal/ml of heat. On the other hand, water has a specific heat of 1 cal/g·°C and absorbs it as sensible heat, so it absorbs only 10 cal/ml per unit volume while rising from 5°C to 15°C. In this way, when polyethylene glycol with a molecular weight of 400 is used as a latent heat storage material, it can store the same cooling energy but only 1/2 as much energy as water.
A volume of 4.6 would be good. This situation is the same even when other substances that store cooling energy as latent heat are used as the latent heat storage material 6. Therefore, in the above device, the overall configuration can be made much smaller than before. can.

Figure 2 shows another embodiment of this invention.
In the cooling device shown here, the heat transfer tube 7 in the cooling device shown in FIG. 1 is replaced with a heat pipe 12, and a communication pipe 13 connecting the cold water tank 3 and the hot water tank 4 is provided accordingly. That is, as shown in FIG. 2, the heat pipe 12 has one end inserted into the latent heat storage material 6 in the heat storage tank 5 and the other end projected into the cooling tank 3. 12 is configured to transfer heat between the water 2 in the cold water tank 3 and the latent heat storage material 6, and a communication pipe 13 connecting the cold water tank 3 and the hot water tank 4 is provided at the bottom of the heat storage tank 5. It is provided.

Therefore, even in the cooling device shown in FIG.
Similar to the cooling system shown in FIG.
By circulating the water in the order of hot water tank 4 → refrigerator 11 → cold water tank 3, the cable can be cooled.
Further, when the refrigerator 11 is stopped, the water 2 in the cold water tank 3 is cooled by the latent heat storage material 6 via the heat pipe 12, so that the cable can be continuously cooled. Furthermore, since the cooling device shown in FIG. 2 is also configured to store cooling energy as latent heat in the latent heat storage material 6, the entire device can be significantly miniaturized compared to conventional ones.

FIG. 3 is a schematic diagram showing still another embodiment of this invention, in which the storage tank 20 is divided into upper and lower halves, and the lower tank is a heat storage tank 22 filled with a latent heat storage material 21 similar to that described above. Further, the upper tank is a water tank 24 that stores water 23 as a cooling heat medium. Between the heat storage tank 22 and the water tank 24, the lower end is inserted into the latent heat storage material 21, and the upper end is inserted into the water tank 24.
A plurality of heat pipes 25 are arranged that protrude into the water 23 in the water 4, and the heat pipes 25
It is configured to transfer heat between the latent heat storage material 21 and the water 23 via the latent heat storage material 21 and the water 23. Further, the water tank 24 is communicated with a cable or a water cooling pipe 26 arranged in parallel to the cable via a pump 27.
The water tank 24 is connected via a pump 29 to circulate and supply water 23 to a refrigerator 28 .

Therefore, in the cooling device shown in FIG.
By cooling the water 23 in the latent heat storage material 21 by the refrigerator 28 to below the freezing point of the latent heat storage material 21 and circulatingly supplying the water 23 to the water cooling pipe 26, the cable can be cooled and at the same time, the latent heat storage material 21 can be cooled. 21 can be solidified to store cooling energy. If the refrigerator 28 stops for some reason,
Since the latent heat storage material 21 absorbs the latent heat of fusion from the water 23 via the heat pipe 25, the water 23 is cooled, and as a result, the cable can be continuously cooled.

However, in the cooling device having the configuration shown in FIG. 3, in addition to the same effects as in each of the above-described embodiments, even if the storage tank 20 is formed vertically due to installation space constraints, the heat pipe 25 allows cooling energy to be taken out from the deep part of the latent heat storage material 21, and therefore the water 23 can be cooled well by the latent heat storage material 21.

Note that the cooling heat medium in this invention is not limited to water, but may be other fluids such as oil.

In addition, the latent heat storage material in this invention has a molecular weight of 400
Alternatively, the composition is not limited to a single polyethylene glycol of 600, and may be a mixture of polyethylene glycols of appropriate molecular weights in an appropriate ratio. In other words, the freezing point of polyethylene glycol increases as the molecular weight increases, so by mixing polyethylene glycol with an appropriate molecular weight in an appropriate ratio, a latent heat storage material with an arbitrary freezing point can be obtained. The heat storage material is a mixture of polyethylene glycols, so it mixes very well.
Furthermore, no two-phase separation occurs. Therefore, when setting the freezing point or melting point to about 7 to 10°C, it is preferable to use polyethylene glycol having a molecular weight of about 440 to 480 alone or in combination.

As is clear from the above description, the cooling device of this invention uses a latent heat storage material to store cooling energy, and is configured to transfer heat between the latent heat storage material and the cooling heat medium. Compared to conventional devices that use water as a heat storage material, the capacity of the heat storage material can be significantly smaller, and as a result, the entire device can be made smaller and the installation space can be reduced.

[Brief explanation of the drawing]

FIGS. 1 to 3 are schematic diagrams each showing an embodiment of this invention. 1,20...Storage tank, 2,23...Water, 6,2
1... Latent heat storage material, 7... Heat transfer tube, 8...
Water cooling pipe, 11, 28... Refrigerator, 12, 25...
heat pipe.

Claims (1)

[Scope of utility model claims] In a cooling device configured to circulate a cooling heat medium between a storage tank and a cable or a cooling pipe arranged in parallel to the cable, and to cool a cooling heat medium in the storage tank by a cooler, A cable cooling device provided with a cooling latent heat storage material that transfers heat to and from a cooling heat medium in a storage tank.