JP2003021437A - Cooling system and cooling method - Google Patents

Abstract

(57) [Summary] An object of the present invention is to reduce a periodical process of a ventilation air conditioning cooling water system refrigerator. When checking four refrigerators (10), a three-way valve (7) is operated by operating another refrigerator (1) adopted as a chilled water cooling system.
Then, the air conditioner 6 and the other refrigerators 1 are connected to each other, the air conditioner 6 and the four refrigerators 10 are disconnected, and the four refrigerators 10 are stopped and inspected. When checking the refrigerators of the other cooling system, the four refrigerators 10 and the air conditioner 6 are connected by the three-way valve, and the other refrigerators 1 and the air conditioner 6 are shut off, The other three-way valve 8 connects the other refrigerator 1 to the air conditioner of the other cooling system, stops all refrigerators of the other cooling system, and performs inspection. The air conditioning during the inspection is achieved by the function of the refrigerator during the inspection by the other refrigerator 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for supplying cold water cooled by a refrigerator to an air conditioner (hereinafter, simply referred to as an air conditioner). It is effectively used for machine cooling water system.

[0002]

2. Description of the Related Art Nuclear power generation facilities are regularly inspected in order to confirm the soundness of the power generation facilities, and as one of the inspections, the refrigerator of the ventilation air conditioning cooling water system is inspected. Even when the inspection is performed, the ventilation air conditioning cooling water system supplies the cold water cooled by the refrigerator to the air conditioner. That is, chilled water is supplied to the equipment that is operating even during the periodic inspection of the refrigerator and the air conditioner that cools the room in which a person stays, to protect each equipment and maintain the environment.

A plurality of refrigerators are provided in the ventilation / air-conditioning / cooling water system of each building of the nuclear power generation facility. In order to maintain the environment at the time of periodic inspection, modification or repair work of the plurality of refrigerators. The number of refrigerating machines required is operated, a spare machine is installed in addition to this, and the rest are targeted for inspection to maintain the environment. In addition, when power is supplied from two systems for multiple refrigerators, the refrigerator that is supplied with power from the other system is operated while the power facility of one system is performing periodic inspection. , We are trying to maintain the environment.

In this way, some of the refrigerators are operated and the remaining units are stopped for inspection. An example of operating a part of a plurality of refrigerators and stopping the rest of them for inspection is disclosed in JP-A-11-304990.

[0005]

In such a conventional example, the cooling capacity required by the cooling system in a season with a large heat load, such as in the summer, can be met by operating the total number of units minus the number of standby units. Therefore, insufficient cooling capacity does not occur. However, if you try to carry out inspection, remodeling or repair work in a season with a large heat load such as summer, at least one refrigerator or one refrigerator is stopped to carry out check, remodeling or repair work. This leads to a situation where cooling capacity shortage may occur.

Since at least one refrigerator or one refrigerator is stopped for inspection, modification, or repair work, it takes time to complete inspection of both systems. In addition, inspection, modification, or repair work cannot be performed during the season when the heat load is high, such as in the summer when the cooling system is required. Therefore, there is a problem that there is a limit to the shortening of the on-site work process which has been required in recent years.

[0007] Therefore, an object of the present invention is to provide a cooling system capable of shortening the on-site work process without affecting the seasonal heat load when inspecting, remodeling or repairing the refrigerator.

[0008]

The first means for solving the problems of the present invention is a cooling system for circulating cold water cooled by a plurality of refrigerators between the plurality of refrigerators and an air conditioner. , A chilled water cooling facility having at least a total chilled water cooling capacity of the maximum number of operating chillers, and the connection destination of the air conditioner is switched to either the chiller of the maximum operating number or the chilled water cooling facility A cooling system comprising means.

According to such a cooling system, the inspection, modification, or repair work of the plurality of refrigerators is performed in the summer when the heat load is maximum, that is, when the number of operating the plurality of refrigerators is maximum. It is possible to supply the cooling water required for the above to the air conditioner with chilled water which can meet the heat load in the summer by exhibiting the chilled water cooling equipment. Therefore, the communication state between the plurality of refrigerators and the air conditioner is cut off, the air conditioner and the cold water cooling facility are brought into communication, and even if all the plurality of refrigerators are stopped and inspected. The chilled water cooling facility supplies chilled water at an appropriate temperature and flow rate according to the heat load in the summer to the air conditioner without causing a capacity shortage. The maximum operating number of the plurality of refrigerators does not include the number of refrigerators used as standby machines.

Therefore, according to such a cooling system, all of the plurality of refrigerators can be stopped and all of them can be inspected, modified or constructed at the same time.
On-site work process can be shortened. Moreover, it is no longer necessary to select the timing of inspection, modification or repair work depending on the season.

Similarly, the second means is a cooling system according to the first means, in which a plurality of systems of air conditioners are connected in parallel to the chilled water cooling facility via valves. Such a second
According to the means, in addition to the effect of the first means, it is possible to selectively connect an air conditioner of a cooling system of a plurality of systems to the chilled water cooling facility, and to inspect, modify or repair cold water from the chilled water cooling facility. Since it can be supplied to the air conditioner of the system desired, for example, even if any of a plurality of cooling systems dispersed in a plurality of buildings of the nuclear power generation facility is subject to inspection, modification or repair work, the cold water cooling facility is shared. It is possible to carry out inspection, modification or repair work.

Similarly, the third means is a cooling system in which cold water cooled by a plurality of refrigerators is circulated between the plurality of refrigerators and an air conditioner, and the total cold water of the maximum operating number of the plurality of refrigerators is used. Chilled water cooling equipment having at least cooling capacity, moving means equipped with the chilled water cooling equipment, and means for switching the connection destination of the air conditioner to either the chiller of the maximum operating number or the chilled water cooling equipment. A cooling system comprising: the air conditioner; and a connecting means capable of detachably connecting the cold water cooling equipment. The maximum operating number of the plurality of refrigerators does not include the number of refrigerators used as standby machines.

According to the third means, the chilled water cooling equipment is moved to the cooling system side to be inspected, modified or repaired by the moving means, and the chilled water cooling equipment is moved by the connecting means. Connected to the air conditioner, to cut off the plurality of refrigerators from the air conditioner to supply cold water cooled by the cold water cooling facility to the air conditioner,
In the meantime, stop all of the above-mentioned refrigerators and perform inspection, modification or repair work. In this way, by moving the chilled water cooling equipment and connecting it to the cooling system of the system for inspection, modification or repair, use a long piping line between the chilled water cooling equipment and the cooling systems of multiple systems. The same effect as that of the first means can be enjoyed for the cooling systems separated from each other.

The fourth means is a cooling method for cooling the conditioned space in which the air conditioner is placed by circulating cold water cooled by the plurality of refrigerators between the plurality of refrigerators and the air conditioner. A chilled water cooling facility having at least a total chilled water cooling capacity of the maximum operating number of the chillers at the time of being simultaneously operated in a plurality of chillers is connected to the air conditioner, and inspection of the plurality of chillers, A cooling method characterized in that cold water cooled by the cold water cooling facility is supplied to the air conditioner at the time of carrying out a modification or repair work.
The same effect as the means can be obtained.

A fifth means is the fourth means, wherein the chilled water cooling equipment is moved by the moving means so as to approach the location of the cooling system to be inspected, modified or repaired, and after the chilled water cooling equipment is moved. Cooling characterized in that the cold water cooling equipment is connected to the air conditioner, and cold water cooled by the cold water cooling equipment is supplied to the air conditioner at the time of inspection, modification or repair work of the plurality of refrigerators. This is a method, and the same effect as that of the third means can be obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The first embodiment is shown in FIG. 1 and 2 are plan views showing the overall structure of a temporary ventilation air conditioning cooling water system cooling system according to each embodiment of the present invention. This temporary ventilation air conditioning cooling water system cooling system is used by being connected to a cooling system for cooling the interior of a nuclear power generation facility.

In the following, as an embodiment of the present invention, a description will be given using a water-cooled refrigerator in which four refrigerators 10 are used and another refrigerator 1 in which an air-cooled refrigerator is used as cold water cooling equipment. The combination is not necessarily limited to the above combination, and any combination may be used. Also, another refrigerator 1
Will be described below by way of example of one unit, but instead of one other refrigerator 1, a plurality of other refrigerators having a lower capacity as a refrigerator than the other refrigerators 1 will be described. It may be possible to employ a refrigerator as a cold water cooling facility.

In the first embodiment shown in FIG. 1, four refrigerators 10 are connected to the air conditioner 6 in parallel via a pump 9. The pump 9 can circulate cold water as a refrigerant in the heat transfer tube of the air conditioner 6 between the air conditioner 6 and the refrigerator 10. A cold water pipe 21 and a branch pipe 22 extending from the pipe exist as a pipe line for the circulation. A plurality of such cooling systems including four air conditioners 6 and pumps 9 are provided in the nuclear power generation facility.

One end of another cold water pipe 5 for connecting a refrigerator is connected to the middle of the cold water pipe 21 via a three-way valve 7, and the other end is connected to the heat transfer coil 23 of the evaporator 4. This three-way valve 7
Is a plurality of refrigerators 1 with four refrigerators connected to the air conditioner 6.
It is a valve used as a means for selecting 0 or another refrigerator 1. In the middle of the other chiller water pipe 5 for connecting the refrigerator, a chilled water pipe 21 portion of the cooling system of the other system is connected via a connection line 11 to the other ventilation air conditioning cooling water system and a three-way valve 8. This three-way valve 8 is a means used to select which system of the air conditioner the other refrigerator 1 is connected to. In the portion between the three-way valve 8 and the heat transfer coil 23 of the cold water pipe 5 for connecting the refrigerator, the cooling water for the air conditioner 6 is connected between the evaporator 4 and the air conditioner 6 to another cold water pipe 5 for connecting the refrigerator. It is equipped with a pump 24 that circulates through it.

Reference numeral 1 is another refrigerator. The other refrigerator 1 includes a compressor 2, a condenser 3, and an evaporator 4, which are main components of the refrigerator unit. The evaporator 4 has a function of receiving and cooling the cooling water as a refrigerant which has passed through the heat transfer pipe of the air conditioner 6 and has been heated. The compressor 2 has a function of receiving the refrigerant gas from the evaporator 4, compressing it, and sending it to the condenser 3. The condenser 3 is used to condense and liquefy the refrigerant gas compressed by the compressor 2 and supply it to the evaporator 4 to cool the refrigerant in the air conditioner 6.

The necessary power source for the other refrigerator 1 is obtained by receiving power from the power source in the nuclear power generation facility.

In the second embodiment shown in FIG. 2, as in the first embodiment, four refrigerators 10 are connected to the air conditioner 6 via the pump 9 in parallel. The pump 9 can circulate cold water as a refrigerant in the heat transfer tube of the air conditioner 6 between the air conditioner 6 and the refrigerator 10. A cold water pipe 21 and a branch pipe 22 extending from the pipe exist as a pipe line for the circulation. The four refrigerators 10 as described above are provided with a plurality of cooling systems including the air conditioner 6 and the pump 9 in the nuclear power generation facility.

One end of another chiller water pipe 5 for connecting a refrigerator is connected in the middle of the chilled water pipe 21 via a three-way valve 7, and a ventilation air conditioning cooling water system connection port 13 is attached to the other end. A pump 24 is provided at another cold water pipe 5 portion for connecting the refrigerator between the three-way valve 7 and the ventilation air conditioning cooling water system connection port 13.

Another freezer 1 is mounted and equipped on a self-propelled vehicle 14 as a moving means. Similar to the first embodiment, the other refrigerator 1 is provided with a compressor 2, a condenser 3 and an evaporator 4, which are the main components of the refrigerator unit.
The same function as that of the embodiment is exhibited. A coupling nozzle 12 is connected to the heat transfer tube in the evaporator 4 via a hose or the like, and the coupling nozzle 12 is detachable so that it can be connected to or separated from the ventilation air conditioning cooling water system connection port 13. It has the configuration of.

The necessary power source for the other refrigerator 1 may be obtained by receiving power from the power source in the nuclear power generation facility, or may be obtained from a power storage device or a generator mounted on the self-propelled vehicle 14. Is also good.

Both the first embodiment and the second embodiment are operated as follows during a period other than when the inspection, modification or repair work is performed. First, by switching the three-way valve 7, the refrigerator 10 and the air conditioner 6 are connected to each other, and the chilled water pipe 21 and the other chiller water pipe 5 for connecting a refrigerator are shut off from each other. In this state, the number of refrigerators 10, air conditioners 6, and chilled water pumps 9 that correspond to the heat load are operated. In the case of a normal nuclear power generation facility, three of the four refrigerators 10 are operated to exert the ability to cool chilled water, and the refrigerator 10 in the event of a failure of the other refrigerator 10 It is on standby as a standby machine so that it can take the place of. Therefore, the other refrigerator 1
As long as 0 does not break down, one refrigerator 10 used as a standby machine
Does not exert the cooling capacity of cold water. Therefore, this first,
In the second embodiment, the maximum number of refrigerators 10 at the time of simultaneous operation is three. In the summer of Japan, where the heat load is maximum, the maximum number of refrigerators 10 at the time of simultaneous operation is three, but in the winter of Japan when the heat load is at a minimum, the time of simultaneous operation The maximum number of refrigerators 10 may be less than 3. In any case, the maximum number of refrigerators 10 at the time of simultaneous operation throughout the year is three.

When the refrigerator 10, the air conditioner 6 and the cold water pump 9 are operated, cold water as a refrigerant is circulated between the air conditioner 6 and the refrigerator 10 through the cold water pipe 21 and the branch 22 by the force of the cold water pump. To do. In this way, the cold water cooled in the refrigerator 10 circulates in the air conditioner 6, and the air conditioner 6 exchanges heat with the surrounding air to cool the air. The cold water after cooling the air is circulated to the refrigerator 10 by the cold water pump 9 again. By circulating such cold water, the nuclear power generation equipment and human work space are maintained at appropriate temperatures.

Next, when stopping the refrigerators 10 for inspection, modification or repair work of the refrigerators 10 etc., all four refrigerators 10 are stopped. At the same time, the three-way valve 7 is switched to cut off the communication between the refrigerator 10 and the air conditioner 6, and bring the evaporator 4 and the air conditioner 6 into a communication state. Further, the three-way valve 8 is switched so that the other cold water pipes 5 for connecting the refrigerator, which extend to the left and right of the three-way valve 8, are brought into communication with each other, and the cold water pipe 5 for connecting the other refrigerator and the other ventilation air conditioning cooling water system are connected. The line 11 is cut off.

When the other refrigerator 1 and the pump 24 are operated in such a state, the cold water of the air conditioner 6 is passed by the pump 24 through the other cold water pipe 5 for connecting the refrigerator to the evaporator of the other refrigerator 1. It is distributed to the heat transfer tube 23 of No. 4 and cooled. The cold water cooled by the other refrigerator 1 circulates in the air conditioner 6 through the other cold water pipe 5 for connecting the refrigerator, and the air conditioner 6 exchanges heat with the surrounding air to cool the air. The cold water after cooling the air is again circulated to the other refrigerator 1 side by the pump 24. By circulating such cold water, the nuclear power generation equipment and human work space are maintained at appropriate temperatures.

As described above, since the other refrigerator 1 has a cooling capacity capable of maintaining the air-conditioned space by the air conditioner 6 at an appropriate temperature, the other refrigerator 1 is cooled by the cooling system in the season of inspection. Exert their abilities. In other words, even if all of the refrigerators 10 are stopped, the other refrigerators 1 have a capability of supplying the air conditioners 6 with cold water that can maintain the air-conditioned space of the air conditioners 6 at an appropriate temperature. That is, the other refrigerators 1 exert the total cooling capacity of the cold water that the three refrigerators 10 have achieved. The capability that the other refrigerator 1 can exhibit is the same in the second embodiment described later.

While the other refrigerator 1 and the air conditioner 6 are connected to maintain the air-conditioned space at an appropriate temperature, the entire refrigerator 10 which is stopped
The cold water pump 9, etc. will be inspected, modified or repaired at once.

When all of the refrigerators and chilled water pumps of other systems are to be inspected, modified or repaired at once, the three-way valve 7 is switched to connect the air conditioner 6 and the four refrigerators 10 to each other. The connection between 6 and the other refrigerator 1 is cut off. In such a state, an operation of circulating cold water between the refrigerator 10 and the air conditioner 6 is performed to maintain the air-conditioned space at an appropriate temperature. On the other hand, the three-way valve 8 is switched to change the cold water pipe 5 for connecting to another refrigerator.
And the line 11 for connection with the other ventilation air conditioning cooling water system are brought into communication with each other.

In this way, the cold water circulated from the other refrigerator 1 to the air conditioner 6 passes through the cold water pipe 5 for connecting the other refrigerator and the connection line 11 to the other ventilation air conditioning cooling water system. Is supplied to an air conditioner of another system of a cooling water system different from the system including the refrigerator 10 and the air conditioner 6. Therefore, all the refrigerators and chilled water pumps of other systems can be stopped and they can be checked, modified or repaired at once. In this way, by switching one other refrigerator 1 to a plurality of systems by switching with a three-way valve, one other refrigerator can be diverted to a plurality of systems, which is economical.

Since all the refrigerators 10 can be stopped in this way, regular inspections of all the refrigerators 10 can be carried out simultaneously, and the inspection process can be shortened.

Further, in the case of the second embodiment, when the inspection, modification or repair work is performed, the self-propelled vehicle 14 is brought close to the building in which the cooling system to be inspected, modified or repaired exists. After that, the connecting nozzle 12 is connected to the ventilation air conditioning cooling water system connection port 13 for communication.

Next, by switching the three-way valve 7, the circulation of cold water between the refrigerator 10 and the air conditioner 6 is cut off, and the air conditioner 6 and other cold water pipes 5 for connecting the refrigerator are cooled by the cold water. Switch to communication so that it circulates.

In this way, the pump 24 and other refrigerators 1
To cool the cold water of the air conditioner 6 through the cold water pipe 5 for connecting the other refrigerator to the heat transfer pipe 23 of the evaporator 4 to cool the cold water by the other refrigerator 1, and cool the cooled water after cooling. Circulate back to. The cooled chilled water cools the surrounding air by the air conditioner 6 and circulates to the other refrigerator 1 side again. By repeating such circulation, the temperature of the air-conditioned space by the air conditioner 6 can be maintained at an appropriate temperature. Therefore, it is possible to stop all the refrigerators 10 and the chilled water pumps 9 and inspect them all at the same time.

Thus, also in the second embodiment, another refrigerator 1
Has a cooling capacity capable of maintaining the air-conditioned space by the air conditioner 6 at an appropriate temperature, the other refrigerating machines 1 exhibit the cooling capacity required by the cooling system in the season when the inspection, modification or repair work is performed. In other words, even if all of the refrigerators 10 are stopped, the other refrigerators 1 have a capability of supplying the air conditioners 6 with cold water that can maintain the air-conditioned space of the air conditioners 6 at an appropriate temperature.

After the refrigerator, etc. of the cooling system shown in FIG. 2 has been inspected, modified or repaired, the three-way valve 7 is switched to connect the refrigerator 10 and the air conditioner 6 so that cold water circulates. , Cold water piping 5 for connecting other refrigerators and air conditioner 6
Cut off communication with. In such a state, cold water is circulated between the refrigerator 10 and the air conditioner 6 to return to normal operation. After returning to normal operation, the connecting nozzle 12 is removed from the ventilation air conditioning cooling water system connection port 13.

Thereafter, the self-propelled vehicle 14 is self-propelled toward the building where the cooling system to be inspected next is present, and when the inspection, modification or repair work of the other cooling system is carried out, the other refrigerator 1 is used as described above. Used for.

In the second embodiment as well, since it is possible to stop all the refrigerators 10 while maintaining an appropriate temperature in the air-conditioned space, it is possible to simultaneously carry out regular inspection, modification, or repair work of all the refrigerators 10. It is possible to shorten the inspection process. In addition, by making the other refrigerator 1 movable, the three-way valve 8 and the line 11 for connecting to the other ventilation air-conditioning cooling water system, which are required in the first embodiment, are not required, and the other ventilation is performed at the connecting nozzle 7. It becomes possible to connect to the air conditioning cooling water system. As a result, in the second embodiment, another refrigerator 1 in a nuclear power plant having a plurality of nuclear reactors while reducing the quantity of piping lines and valves added to the cooling system is used.
Can be shared.

In the above first and second embodiments, the use of other refrigerators at the time of inspection, remodeling or repair work is explained, but as another way of use, while the nuclear power plant is operating, Ventilation / air-conditioning When an unexpected event such as damage to the cooling water system and chilled water system piping occurs, and it is necessary to stop all of the refrigerators 10 except at the time of inspection, modification or repair, air conditioning is performed on the other refrigerators 1. The refrigerator 6 may be connected to another refrigerator 1 to remove the heat load so that the environment inside the nuclear power plant is maintained at an appropriate temperature.

In the above-described first and second embodiments, the three-way valve 7 is used as a means for switching the connection of the other refrigerator 1 and the plurality of refrigerators 10 to the air conditioner 6, but FIG. As described above, the other refrigerating machine connecting cold water pipes 5 and the air conditioner 6 are connected without passing through the three-way valve 7, and the valve 17 is provided at the site of the other refrigerating machine connecting cold water pipes 5 on the upstream side of the pump 24. Provided, cold water piping 21
It is also possible to use a connection switching means having a configuration in which the valve 18 is provided in the. In this case, if the valve 17 is opened and the valve 18 is closed, cold water is connected so as to circulate between the other refrigerators 1 and the air conditioner 6, and the cold water is connected between the plurality of refrigerators 10 and the air conditioner 6. The circulation of cold water in the is stopped.

On the contrary, when the valve 17 is closed and the valve 18 is opened, the circulation of cold water between the other refrigerator 1 and the air conditioner 6 is stopped,
Circulation of cold water between the plurality of refrigerators 10 and the air conditioner 6 can be achieved. The adoption of such valves 17 and 18 can be similarly used in the first embodiment as a means for switching the connection between the other refrigerator 1 and the plurality of refrigerators 10 to the air conditioner 6.

Since the adoption of the valves 17 and 18 does not affect the other constructions, the other constructions are the same as those in the first and second embodiments.

[0046]

According to the present invention, the number of refrigerators can be stopped while the air-conditioned space is being cooled for inspection, modification, or repair, so that the refrigerator inspection process can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view of a temporary ventilation air conditioning chilled water system cooling system according to a first embodiment of the present invention.

FIG. 2 is a plan view of a temporary ventilation air conditioning cold water system cooling system according to a second embodiment of the present invention.

FIG. 3 is a plan view of a temporary ventilation air conditioning cold water system cooling system according to a modification of the second embodiment of the present invention.

[Explanation of symbols]

1 ... Other refrigerator, 2 ... Compressor, 3 ... Condenser, 4 ... Evaporator, 5 ... Chilled water piping for connecting other refrigerators, 6 ... Air conditioner, 7,
8 ... Three-way valve, 9 ... Cold water pump, 10 ... Refrigerator, 11 ... Line for connecting with other ventilation air conditioning cooling water system, 12 ... Connecting nozzle, 13 ... Ventilation air conditioning cooling water system connection port.

Claims (5)

[Claims] 1. A cooling system in which cold water cooled by a plurality of refrigerators is circulated between the plurality of refrigerators and an air conditioner, and at least a total cooling water cooling capacity of maximum operating numbers of the plurality of refrigerators is provided. A cooling system, comprising: a chilled water cooling facility that has; and a unit that switches a connection destination of the air conditioner to either the chiller of the maximum operating number or the chilled water cooling facility. 2. The cooling system according to claim 1, wherein the air conditioners of a plurality of systems are connected in parallel to the chilled water cooling facility via a valve. 3. A cooling system in which cold water cooled by a plurality of refrigerators is circulated between the plurality of refrigerators and an air conditioner, and at least a total cooling water cooling capacity of maximum operating numbers of the plurality of refrigerators is provided. A chilled water cooling facility having, a moving means equipped with the chilled water cooling facility, a means for switching a connection destination of the air conditioner to either the maximum number of operating refrigerators or the chilled water cooling facility, the air conditioning A cooling system comprising a machine and a connecting means capable of detachably connecting the cold water cooling equipment. 4. A cooling method in which cold water cooled by a plurality of refrigerators is circulated between the plurality of refrigerators and an air conditioner to cool an air-conditioned space in which the air conditioner is placed. A chilled water cooling facility having at least a total chilled water cooling capacity of the maximum number of operating chillers at the time of simultaneous operation in the machine is connected to the air conditioner, and inspection or modification or repair of the plurality of chillers is performed. A cooling method, wherein cold water cooled by the cold water cooling facility is supplied to the air conditioner at the time of construction. 5. The chilled water cooling equipment according to claim 4, wherein the chilled water cooling equipment is moved by a moving means so as to come close to a location of a cooling system to be inspected, modified or repaired, and the chilled water cooling equipment is moved to a location where the chilled water cooling equipment is moved. A cooling method, wherein cooling equipment is connected to the air conditioner, and cold water cooled by the cold water cooling equipment is supplied to the air conditioner during inspection, modification, or repair work of the plurality of refrigerators.