JPS598128B2 - Power cable cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION It is known to cool a cooling medium (oil or water) circulating in a cable using a vapor compression refrigerator.

In this system, all the energy for operating the refrigerator is supplied from outside.

As cable capacity increases, its energy requirements also greatly increase.

On the other hand, all of the large amount of heat released from the condenser of the refrigerator is wasted.

However, a large amount of cooling medium circulates within the cable, and the amount of heat that the cooling medium has, whose temperature has risen due to heat generation in the cable, is extremely large.

In the present invention, this large amount of heat is used to operate an absorption refrigerator or a turbine refrigerator to cool the cable.

However, the temperature rise of the cooling medium in the cable is limited to about 70°C.

Therefore, by using a smaller refrigerator than before as a heat pump, it pre-cools the cooling medium that has risen to about 70 degrees Celsius, and at the same time releases the heat taken from the cooling medium to a higher temperature, and uses the released heat to perform the above-mentioned I started operating the heat 1 drive type refrigerator.

Example 1 (FIG. 1) This is a case where a heat pump 10 and an absorption refrigerator 30 are combined.

10 shows the entire heat pump.

This is well known and is as follows.

That is, the condensed refrigerant 12 is sent to the evaporator 16 through the expansion valve 14 to remove the heat of vaporization and cool the cooling medium 56.

A compressor 18 that operates the refrigerant gas 12' with an electric motor 20
The high-pressure liquefied refrigerant 12 is produced by compressing the refrigerant and releasing the heat of condensation in the condenser 22.

30 shows the entire absorption refrigerator.

This is also well known and is as follows.

That is, in the generator 32, refrigerant vapor 33 is generated by heat supplied from the outside, liquefied in the condenser 34, and sent to the evaporator 38 through the expansion valve 36 to remove the heat of vaporization.

The refrigerant vapor 33 is absorbed into an absorption liquid in an absorber 40 .

The absorption liquid 41 that now contains a large amount of refrigerant is sent to the generator 32, and also generates refrigerant vapor 33.

On the other hand, the absorption liquid 42, which has generated refrigerant vapor 33 and has a reduced amount of refrigerant, is returned to the absorber 40 and circulated.

50 is a cable, and the cooling medium 56 is circulated through the evaporator 16 of the heat pump 10 and further through the evaporator 38 of the absorption refrigerator 30.

In addition, the condenser 22 of the heat pump 10 and the absorption refrigerator 3
A circulation circuit 52 is formed around the 00 generator 32, and water, oil, or the like is circulated therein as a heating medium 54.

Further, as the absorption refrigerator 30, for example, a water lithium monobromide system is used.

Its action is as follows.

The cooling medium 56 of the cable 50 exits the cable 50 at a temperature of about 70° C. as described above.

It is first precooled to about 45° C. in the evaporator 16 of the heat pump 10.

On the other hand, the temperature of the heat taken from the cooling medium 56 in the evaporator 16 is raised by the heat pump 10 to 100 to 12
The temperature is reduced to 0° C. and discharged from the condenser 22.

This heat heats the heating medium 54 and transfers it to the absorption refrigerator 3.
It is used as a heat source for the 00 generator 32, and the absorption refrigerator 30
drive.

In the evaporator 38, the cooling medium 56 previously precooled by the heat pump 10 is further cooled, for example,
℃ and then fed into the cable 50 again and circulated.

In this way, the refrigerating capacity of the heat pump 10 may be % or less than that of a conventional compression refrigerator alone.

Note that if the cable load fluctuations are large, the absorption refrigerator 30 may be provided with an auxiliary heat source.

Example 2 (FIG. 2) This is a case where a heat pump 10 and a turbine refrigerator 60 are combined.

10 is a heat pump, which is the same as above.

Reference numeral 60 indicates the entire turbine type refrigerator.

This is also well known and is as follows.

That is, refrigerant 65 is compressed by a compressor 63 operated by a steam turbine 62, liquefied in a condenser 64, sent to an evaporator 70 through an expansion valve 68, removes heat of vaporization, and sent to the condenser again. .

In this case, a circulation circuit 72 is formed around the condenser 22 of the heat pump 10 and the turbine 62 of the turbine refrigerator 60.

Then, a fluid 74 that easily evaporates, such as fluorocarbons, is circulated inside.

76 is a condenser.

Its action is as follows.

Due to the heat released from the condenser 22 of the heat pump 10,
The fluid 74 in the circulation circuit 72 evaporates, and the vapor drives the turbine 62 to operate the turbine refrigerator 60 .

In this case as well, as in the first embodiment, the cooling medium 56 of the cable 50 is supplied to the cooling medium 56 by the evaporator 16 of the heat pump 10.
It is precooled from 0° C. to about 45° C., further cooled to about 20° C. by the evaporator 70 of the turbine refrigerator 60, and then sent to the cable 50.

Effects of the invention By cooling the cooling medium 56 of the cable 50,
The heat taken away from the heat is eventually released into the atmosphere, etc., but instead of wasting all of it as is the case when using conventional compression refrigerators, a portion of it is released into the atmosphere. It is used for operating the turbine type refrigerator 60.

Therefore, the amount of energy supplied from the outside can be smaller than before.

In addition, since the waste heat from the cable 50 is heated to a high temperature by the heat pump 10 and used, the absorption chiller 3
0 and the turbine type refrigerator 60 can be operated efficiently.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of different embodiments of the present invention. 10: heat pump, 30: absorption refrigerator, 50: cable, 60: turbine refrigerator.

Claims (1)

[Claims] 1. The cooling medium of the cable whose temperature has increased is led out of the cable, and it is pre-cooled using a heat pump. At the same time, the heat taken from the cooling medium is released at a higher temperature, and the high temperature is A cooling device for a power cable, characterized in that an absorption refrigerator or a turbine refrigerator is operated using the released heat of the cooling medium of the cable, which further cools the cooling medium of the cable, and sends the cooling medium to the cable for circulation.