KR20100036941A - Air-conditioning method and air-conditioning system - Google Patents

Abstract

PURPOSE: An air conditioning method and air conditioner which optimizes the consumed energy of a cooling tower are provided to produce cooled energy of optimum temperate in each operation mode by controlling the number of cooling tower which needs to be driven. CONSTITUTION: An air conditioner(10) comprise a plurality of cooling towers(42A,42B,42C,42D,42E,42F,42G,42H), refrigerators(44X,44Y,44Z), a refrigerator cycle line, a pre-cooling cycle line, a line switching member, and a controller. The cooling tower cools the cooling water. The refrigerator comprises condensers and evaporators. The refrigerator cycle line circulates the cooling water cooled in the evaporator and the cooling water cooled in the cooling tower. The pre-cooling cycle line circulates the cooling water cooled in the cooling tower by a cooperation load part.

Description

Air-conditioning method and air-conditioning system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning method and an air conditioning system, and more particularly, to an air conditioning method such as a clean room or a building air conditioning and an air conditioning system.

In a clean room or building facility, cooling operations are carried out throughout the year. Therefore, energy saving is an important issue in the air conditioning system of these facilities, and thus, free cooling has recently been carried out (see Japanese Patent Laid-Open No. 2004-132651).

Free cooling is a method of operating a refrigerator using a freezer as a cooling heat source in the summer, and a winter is a system for precooling operation using a cooling tower as a cooling heat source without using a freezer. According to this system, since cooling can be performed without operating a refrigerator in winter, a large energy saving effect can be expected.

However, in such an air conditioning system, one cooling tower is shared in both a refrigerator operation and a precooling operation, and a dedicated cooling tower may be used in each case.

In either case, however, waste of energy consumption in the cooling tower occurs. For example, when one cooling tower is shared, the amount of cooling water required (ie, the amount of cooling heat) is different in the freezer operation and the precooling operation, so that one of the cooling towers is operated in accordance with one operation and is unnecessary in the other operation. Energy consumption.

In addition, when a dedicated cooling tower is adopted for each of the freezer operation and the precooling operation, there is a problem that the energy efficiency is lowered when the operation is resumed.

This invention is made | formed in view of such a situation, and an object of this invention is to provide the air conditioning method and the air conditioning system which can optimize the energy consumption of a cooling tower.

A first aspect of the present invention for achieving the above object is a refrigerator operation using a refrigerator supplied with a cooling water cooled in a plurality of cooling towers as a cold heat source, and precooling using at least a portion of the plurality of cooling towers as a cold heat source. An air conditioning method for driving, characterized in that for controlling the number of operation of the cooling tower during the precooling operation.

According to the present invention, by controlling the number of operation of the cooling tower during the precooling operation, it is possible to generate an optimal amount of cooling heat in each operation mode, thereby reducing the energy consumption in the whole.

According to a second aspect of the present invention, in the first aspect, a cooling tower which serves as the cooling heat source during interim operation while at least a part of the plurality of cooling towers is used together with the refrigerator as a cooling heat source. It is characterized by controlling the number of movable. The use of a cooling tower and a refrigerator together means that the cooling tower and the refrigerator are connected in series and used, for example, when the cooling water cooled in the cooling tower is further cooled by a freezer and supplied to the air conditioning load.

According to the present invention, since the number of movable towers is controlled even during the intermediate operation, an appropriate amount of cooling heat can be generated. This can reduce the overall energy consumption.

 According to a third aspect of the present invention, in the first or second aspect, the operation is changed according to an outside air temperature and an air conditioning load condition. According to the present invention, the amount of cooling heat (temperature or flow rate of cooling water) in which the energy consumption is minimized by the outside air temperature and air conditioning load conditions can be obtained by simulation or the like. Therefore, according to the result, by controlling the operation number of the cooling tower, it is possible to perform the air conditioning operation with the minimum energy consumption.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a plurality of the refrigerators are provided and the number of movable towers of the cooling tower is controlled for the plurality of refrigerators, respectively. According to the present invention, since the number of operating towers of the cooling tower is controlled for each refrigerator, for example, even if the amount of cooling heat required by each refrigerator is different, the minimum required amount of cooling heat can be supplied to each refrigerator, thereby reducing the energy consumption of the entire refrigerator. .

In the fifth aspect of the present invention, in any one of the first to fourth aspects, the refrigerator is a turbo refrigerator, and is characterized by inverter control. According to the present invention, it becomes possible to reduce the energy consumption of the refrigerator.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the flow rate of the cooling water is controlled by controlling the rotation speed of the pump circulating the cooling water cooled by the plurality of cooling towers or the freezer. It features. According to the present invention, the energy consumption required to circulate the cooling water can be reduced.

According to a seventh aspect of the present invention for achieving the above object, a plurality of cooling towers for cooling cooling water, a freezer having a condenser and an evaporator, and circulating the cooling water cooled in the cooling tower to the condenser, A freezer operation circulation line for circulating cooled coolant to the air conditioning load portion, a precooling operation circulation line for circulating the coolant cooled in the cooling tower to the air conditioning load portion, the freezer operation circulation line and the precooling operation Line switching means for controlling the number of cooling towers connected to the precooling operation circulation line at the same time as switching the circulation circulation line, and controlling the line switching means and controlling the operation and stop of the plurality of cooling towers individually. Provided is an air conditioning system comprising a device.

According to the present invention, the number of movable towers in the cooling tower can be controlled during the precooling operation. Thus, an amount of cooling heat suitable for each operation mode can be generated, thereby reducing the energy consumption of the entire system.

In an eighth aspect of the present invention, in the seventh aspect, the intermediate operation circulation line for connecting the plurality of cooling towers in series to the evaporator of the refrigerator is provided, and the line switching means includes the intermediate operation circulation line. And switching the number of lines and simultaneously changing the number of cooling towers connected to the intermediate operation circulation line.

According to the present invention, by connecting the cooling tower and the evaporator of the refrigerator in series, the intermediate operation in which the cooling tower and the refrigerator are used together as a cooling heat source can be performed. Furthermore, according to the present invention, the number of movable towers in the cooling tower can be controlled. Therefore, the amount of cooling heat (coolant temperature and flow rate) suitable for the intermediate operation can be adjusted to reduce the energy consumption of the entire system. Alternatively, the intermediate driving circulation line may be used as the precooling circulation line. In this case, by stopping the refrigerator, the intermediate operation circulation line can be used as the precooling operation circulation line.

According to a ninth aspect of the present invention, in the seventh or eighth aspect, the number of the cooling towers connected to each refrigerator at the same time a plurality of the refrigerators are provided is changed to the line switching means.

According to the present invention, the number of movable towers of the cooling tower can be controlled for each of the plurality of refrigerators. Therefore, even if the amount of cold heat required by the plurality of refrigerators is different, a suitable amount of cold heat can be generated. This can reduce energy consumption throughout the system.

According to the present invention, by controlling the operation number of the cooling tower, an optimal amount of cooling heat can be generated in each operation mode, thereby reducing energy consumption throughout the system.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the air conditioning method and the air conditioning system which concern on this invention is described in detail according to an accompanying drawing.

(1st embodiment)

1 is a system diagram schematically showing a configuration of an air conditioning system of a first embodiment. The air conditioning system 10 shown in the figure is a system for air conditioning the clean room facility 12.

The clean room facility 12 is provided with a fan filter unit 16 (hereinafter referred to as an FFU) on the ceiling surface of the clean room 14. The air in the ceiling space 18 is purified by the FFU (fan filter unit) to clean the room. Down flow (14). The bottom surface of the clean room 14 is a grating floor so that the air in the clean room 14 is sucked into the space below the plate 20 and returned to the ceiling space 18 through the return chamber 22. Lose. Accordingly, the air in the ceiling space 18 is sent back to the clean room 14 by the FFU (16 fan filter unit) to maintain the clean room 14 with high cleanliness.

The return chamber 22 is provided with a heat-sensitive coil 24Y to cool the air flowing in the return chamber 22 to treat the heat-sensitive heat. have. In the clean room 14, a device 26 such as a semiconductor manufacturing device is installed, and a coil 28 is installed in the device 26 so that a coolant is formed between the coil 28 and the device load heat exchanger 24X. It is supposed to circulate. In addition, the clean room facility 12 is provided with an external conditioner 30 (external conditioner). The external conditioner 30 includes a coil 24Z for an external heater, a humidifier 32, a heater 34, a fan 36, a filter (not shown), and the like. The outside air is sucked in by driving it. Then, the filter is damped in a filter (not shown), cooled in an external air conditioner coil 24Z, humidified by a humidifier 32, heated by a heater 34 as necessary, and then into the facility. It is supplied with air.

The air conditioning system 10 of this embodiment is a system which supplies cooling heat to the heat load exchanger 24X for an apparatus load, the coil for thermal processing 24Y, and the coil 24Z for external air conditioners, and procures a cooling load. The device load heat exchanger 24X, the thermal treatment coil 24Y, and the external air conditioner coil 24Z have different temperatures of the required cold water. For example, the device load heat exchanger 24X is 17 ° C, The coil 24Y for processing is set to 12 ° C, and the coil 24Z for the external air conditioner is set to 7 ° C. Hereinafter, the apparatus load heat exchanger 24X, the thermal processing coil 24Y, and the external shell coil 24Z are referred to as the load portion 24X, the load portion 24Y, and the load portion 24Z, respectively.

The air conditioning system 10 mainly consists of eight cooling towers 42A-42H and three refrigerators 44X, 44Y, 44Z. In addition, the number of a cooling tower and a refrigerator is not limited to the example of this embodiment, For example, a cooling tower may be seven towers or less, 9 towers or more, and two or less refrigerators may be four or more.

The cooling towers 42A to 42H omit their internal configuration, but are provided with a fan for forming an upward air flow of outside air in the tower, a watering pipe for watering the cooling water in the tower, and a water collecting portion for collecting the watered cooling water. According to the cooling towers 42A to 42H, the cooling water is sprinkled and brought into contact with the outside air, whereby the heat of evaporation is lost to the cooling water and cooled. In the present embodiment, the sealed cooling tower is described as an example, but an open cooling tower may be employed by adding a heat exchanger.

On the other hand, the three refrigerators 44X, 44Y, 44Z are apparatuses which generate cooling water of the temperature required for the load part 24X, 24Y, 24Z, respectively. Condensers 46X, 46Y, 46Z and evaporators 48X, 48Y, 48Z are installed inside the refrigerators 44X, 44Y, 44Z, respectively. ) Is connected by a circulation path (not shown) so that the refrigerant circulates. The coolant is cooled in the evaporators 48X, 48Y, 48Z by circulating the condensers 46X, 46Y, 46Z and the evaporators 48X, 48Y, 48Z. In addition, the structure of the refrigerators 44X, 44Y, 44Z is not specifically limited, Various configurations, such as a turbo type and an absorption type, can be employ | adopted, However, in this embodiment, it demonstrates as an example of a turbo type refrigerator.

The evaporators 48X, 48Y, 48Z of the refrigerators 44X, 44Y, 44Z are connected to the load portions 24X, 24Y, 24Z, respectively. That is, the evaporator 48X is connected to the load part 24X via piping x3 and x4, and the pump 50X is arrange | positioned at the piping x3. By driving the pump 50X, the coolant is circulated between the evaporator 48X and the load portion 24X. Similarly, the evaporator 48Y is connected to the load part 24Y through the piping y3 and y4, and the pump 50Y is arrange | positioned at the piping y3. By driving this pump 50Y, cooling water circulates between the evaporator 48Y and the load part 24Y. In addition, the evaporator 48Z is connected to the load part 24Z via the piping z3 and z4, and the pump 50Z is arrange | positioned at the piping z3. By driving this pump 50Z, cooling water circulates between the evaporator 48Z and the load part 24Z. Thus, the refrigerators 44X, 44Y, 44Z and the load parts 24X, 24Y, 24Z are connected one by one.

The condensers 46X, 46Y, 46Z of the refrigerators 44X, 44Y, 44Z are connected to the cooling towers 42A-42H, respectively. The cooling towers 42A-42H are connected in parallel with the condenser 46X, 46Y, 46Z. That is, cooling water outflow piping a1-h1 is connected to cooling tower 42A-42H, and this piping a1-h1 is connected to main pipe j1. The main pipe j1 branches into the pipes x1, y1, z1 and is then connected to each condenser 46X, 46Y, 46Z. Cooling water outflow pipes x2, y2, z2 are connected to the condenser 46X, 46Y, 46Z, and these pipes x2, y2, z2 are connected to the main pipe j2. The main pipe j2 is branched into the pipes a2 to h2 and connected to the watering pipe (not shown) of each cooling tower 42A to 42H. Thereby, the cooling water cooled by each cooling tower 42A-42H can be circulated-supplied to condenser 46X, 46Y, 46Z, and cooling tower 42A-42H can be used as a cooling means of the refrigerators 42X-42Z.

On the other hand, the pumps 52x, 52y, and 52z are disposed in the pipes x1, y1, and z1, respectively, and the pumps 52x, 52y, and 52z are individually driven and controlled to individually condenser 46X, 46Y, and 46Z. Cooling water is circulated and the amount of circulation can be adjusted.

In addition, three-way valves 54X, 54Y, and 54Z are disposed in the pipes x2, y2, and z2, respectively, and the coolant flowing through the pipes x2, y2, and z2 is operated by operating the three-way valves 54X, 54Y, and 54Z. A part of the gas flows through the bypass pipes 56X, 56Y, 56Z to the pipes x1, y1, z1 to adjust the flow rate.

By the way, the cooling towers 42A-42H are connected in series with the evaporators 48X, 48Y, 48Z of the freezers 44X, 44Y, 44Z.

That is, the pipe x3 is connected to the main pipe j2 through the pipe x6 and to the main pipe j1 through the pipe x5. Accordingly, the cooling water flowing through the pipe (x3) flows through at least one of the cooling towers (42A to 42H) through the pipe (x6) and the main pipe (j2) to the original pipe (x3) through the main pipe (j1) and the pipe (x5). Go back As a result, the cooling towers 42A to 42H are connected in series with the evaporator 48X of the refrigerator 44X. A pump 58X is provided in the pipe x6, and the coolant in the pipe x3 flows into the pipe x6 by driving the pump 58X. In addition, on / off valves 60X and 62X are provided in the pipe x3 and the pipe x6 immediately downstream of the connection portion, and on / off valve 63X is provided in the pipe x5. By opening / closing these open / close valves 60X, 62X, and 63X, it is possible to select whether or not to cool the cooling water in the pipe x3 to the cooling towers 42A to 42H. In addition, a three-way valve 64X is disposed in the pipe x6 so that a part of the coolant flowing through the pipe x6 flows into the pipe x5 through the bypass pipe 66X by operating the three-way valve 64X. Flow rate adjustment is performed.

Similarly, the pipe y3 is connected to the main pipe j2 through the pipe y6 and to the main pipe j1 through the pipe y5. Accordingly, the cooling water flowing through the pipe y3 flows through at least one of the cooling towers 42A to 42H through the pipe y6 and the main pipe j2 and returns to the original pipe y3 through the main pipe j1 and the pipe y5. Goes. As a result, the cooling towers 42A to 42H are connected in series with the evaporator 48Y of the refrigerator 44Y. The pump 58Y is provided in the pipe y6, and the coolant in the pipe y3 flows into the pipe y6 by driving the pump 58Y. In addition, on the piping y3 and the piping y6, on / off valves 60Y and 62Y are provided immediately downstream of the connecting portion, and on / off valve 63Y is provided on the pipe y5. By opening / closing these open / close valves 60Y, 62Y, and 63Y, it is possible to select whether or not to cool the cooling water flowing through the pipe y3 to the cooling towers 42A to 42H. In addition, a 3-way valve 64Y is disposed in the pipe y6, and a part of the coolant flowing through the pipe y6 flows into the pipe y5 through the bypass pipe 66Y by operating the 3-way valve 64Y. Flow rate adjustment is performed.

In addition, the pipe z3 is connected to the main pipe j2 through the pipe z6 and to the main pipe j1 through the pipe z5. Therefore, the cooling water flowing through the pipe z3 flows through at least one of the cooling towers 42A to 42H through the pipe z6 and the main pipe j2 and returns to the original pipe z3 through the main pipe j1 and the pipe z5. Goes. As a result, the cooling towers 42A to 42H are connected in series with the evaporator 48Z of the refrigerator 44Z. A pump 58Z is provided in the pipe z6. The coolant in the pipe z3 flows into the pipe z6 by driving the pump 58Z. In addition, on the piping z3 and the piping z6, on-off valves 60Z and 62Z are provided immediately downstream of the connection part, and on-pipe z5 is provided with the on-off valve 63Z. By opening / closing these open / close valves 60Z, 62Z, and 63Z, it is possible to select whether or not to cool the cooling water flowing through the pipe z3 to the cooling towers 42A to 42H. In addition, a three-way valve 64Z is disposed in the pipe z6 and a part of the coolant flowing through the pipe z6 flows into the pipe z5 through the bypass pipe 66Z by operating the three-way valve 64Z. Flow rate adjustment is performed.

As described above, in the present embodiment, the cooling towers 42A to 42H can be connected in series with the evaporators 48X, 48Y, and 48Z of the refrigerators 44X, 44Y, and 44Z. Thereby, the intermediate | middle operation which uses together as a cooling heat source can be performed using cooling tower 42A-42H and freezers 44X, 44Y, 44Z simultaneously. That is, the cooling water precooled by either of the cooling towers 42A-42H can be supplied to the refrigerators 44X, 44Y, 44Z, and can be cooled. The energy consumption of the refrigerators 44X, 44Y, 44Z can thus be reduced.

According to the present embodiment, the cooling towers 42A to 42H are connected in series with the evaporators 48X, 48Y, and 48Z of the refrigerators 44X, 44Y, and 44Z, respectively. By stopping circulation, the precooling operation which makes only cooling tower 42A-42H the cooling heat source can be performed.

The main pipes j1 and j2 described above are provided with a plurality of on-off valves 68 for selecting the cooling towers 42A to 42H. The on-off valve 68 is disposed between the connecting portions to which the pipes a1 to h1 are connected on the main pipe j1 or between the connecting parts to which the pipes a2 to h2 are connected on the main pipe j2. . By opening and closing either of these on / off valves 68, the cooling towers 42A to 42H through which the cooling water circulates can be selected. The opening and closing operation of the on-off valve 68 is performed by the control device 70.

The controller 70 is connected to a sensor 72 that measures wet-bulb temperature of outside air, and the measurement data of outside temperature is input from the sensor 72. do. Moreover, the control apparatus 70 is connected to each load part 24X, 24Y, 24Z, and the load condition data is input from each load part 24X, 24Y, 24Z. In addition, the control device 70 is connected to a drive device (not shown) such as a fan of the cooling towers 42A to 42H, so that the start and stop of the cooling towers 42A to 42H can be individually controlled. The controller 70 obtains the flow rate of the cooling water which becomes the minimum required by simulation from the data of the ambient temperature and the load condition, and determines the cooling towers 42A to 42H to be operated so that the cooling water according to the flow rate can be supplied. The cooling towers 42A to 42H are operated, and the on / off valve 68 is controlled to circulate the cooling water to the cooling towers 42A to 42H. Moreover, the cooling towers 42A-42H are stopped about the cooling towers 42A-42H which do not need to flow cooling water.

Next, the operation method of the air conditioning system 10 comprised as mentioned above is demonstrated.

In summer, when the outside air temperature is high, a freezer operation using the freezers 44X, 44Y, 44Z as a cooling heat source is performed. In the freezer operation, the on-off valves 60X, 60Y, 60Z are opened and the on-off valves 62X, 62Y, 62Z, 63X, 63Y, 63Z are closed. Thus, a conduit configuration as shown in Fig. 2A is formed. . As shown in the figure, the cooling towers 42A to 42H are connected to the condensers 46X, 46Y and 46Z of the refrigerators 44X, 44Y and 44Z, and the cooling water cooled by the cooling towers 42A to 42H is condenser 46X, 46Y, 46Z). In addition, the evaporators 48X, 48Y, 48Z of the refrigerators 44X, 44Y, 44Z and the load units 24X, 24Y, 24Z are connected, and the coolant cooled in the evaporators 48X, 48Y, 48Z is loaded in the load units 24X, 24Y. 24Z). Therefore, cold heat can be supplied to the load part 24X, 24Y, 24Z using the refrigerator 44X, 44Y, 44Z as a cold heat source. In addition, although all the cooling towers 42A-42H are used in a refrigerator operation, you may control the number of cooling towers 42A-42H used by opening / closing either of the opening-closing valves 68 (refer FIG. 1). For example, the cooling towers 42A to 42F can be used by closing the on / off valves 68 disposed in the main pipes j1 and j2 between the cooling tower 42F and the cooling tower 42G, and the number of movable towers is eight to six. Can be reduced.

Next, the intermediate operation performed at the outside temperature between summer and winter will be described. The intermediate operation is an operation in which the refrigerators 44X, 44Y, 44Z and parts of the cooling towers 42A to 42H are cold heat sources, and the opening / closing valves 62X, 62Y, 62Z, 63X, 63Y, 63Z are opened to open / close the valve 60X. , 60Y, 60Z). Accordingly, since some of the cooling towers 42A to 42H and the evaporators 48X, 48Y, and 48Z are connected in series, the cooling water is first precooled at the portions of the cooling towers 42A to 42H, and then at the evaporators 48X, 48Y, and 48Z. Cooled and supplied to the load part 24X, 24Y, 24Z. Therefore, a part of cooling tower 42A-42H and freezer 44X, 44Y, 44Z can be used together as a cooling heat source. In the intermediate operation, the cooling water cooled in the remaining part of the cooling towers 42A to 42H by connecting the remaining part of the cooling towers 42A to 42H and the condensers 46X, 46Y and 46Z of the refrigerators 44X, 44Y and 44Z. 46X, 46Y, 46Z are circulated and supplied to cool the refrigerators 44X, 44Y, 44Z.

The number of cooling towers 42A to 42H to be used can be controlled by opening or closing any of the on / off valves 68 (see FIG. 1) during the intermediate operation. As an example, opening and closing on the main pipes j1 and j2 between the cooling tower 42F and the cooling tower 42G, between the cooling tower 42D and the cooling tower 42E, and between the cooling tower 42C and the cooling tower 42D. An example of closing the valve 68 is shown in FIG. 2B. In this example, two of the cooling towers 42G and 42H are connected in series to the evaporator 48X of the refrigerator 44X, and two of the cooling towers 42E and 42F are connected in series to the evaporator 48Y of the refrigerator 44Y. One of 42D is connected in series to the evaporator 48Z of the refrigerator 44Z. Therefore, the number of cooling towers for preliminary cooling can be controlled with two, two, and one. On the other hand, three of the cooling towers 42A to 42C are connected to the condensers 46X, 46Y, 46Z of the refrigerators 44X, 44Y, 44Z. Therefore, the number of cooling towers used as the cooling means of the refrigerators 44X, 44Y, 44Z can be controlled by three. In addition, the above is an example, and by changing the position of the closing valve 68, the number of preliminary cooling towers and the number of cooling towers for refrigerator cooling in each system can be controlled separately.

In winter, when the outside air temperature is low, precooling operation is performed using any of the cooling towers 42A to 42H as a cooling heat source. In this precooling operation, the on-off valves 62X, 62Y, 62Z, 63X, 63Y, 63Z are opened, and the on-off valves 60X, 60Y, 60Z are closed. As a result, any of the cooling towers 42A to 42H is connected to the load portions 24X, 24Y, and 24Z similarly to the intermediate operation. At this time, by stopping the operation of the refrigerators 44X, 44Y, and 44Z, the cooling water cooled in the cooling towers 42A to 42H is circulated and supplied to the load units 24X, 24Y, and 24Z to free the cooling towers 42A to 42H as cooling heat sources. Cooling operation is performed. In addition, the number of cooling towers 42A to 42H to be used can be individually controlled in each system by opening and closing any one of the on-off valves 68 during the precooling operation. In addition, since different cooling towers 42A to 42H are connected to the systems of the load sections 24X, 24Y, and 24Z, the optimum temperature and amount of cooling water can be generated for each system.

The above-mentioned freezer operation, intermediate operation, and precooling operation are automatically switched according to the outside temperature or the load condition. In addition, the change of the operation mode at that time is not limited to switching simultaneously in all the systems of the load part 24X, 24Y, 24Z, You may make it control individually by each system. For example, the intermediate operation or the precooling operation may be performed in the systems of the load units 24X and 24Y, while the freezer operation may be performed in the system of the load units 24Z. In this case, since the precooling cooling tower and the precooling cooling tower are unnecessary in the system of the load part 24Z, the number of cooling towers used for the system of the load part 24X and the load part 24Y can be increased.

Various combinations of operating modes and the number of cooling towers at that time simulate various patterns with the input of outside temperature and load conditions. As a result, the required minimum amount of cooling heat is obtained, and the cooling towers 42A to 42H are selected and operated so as to procure this cooling amount. This can reduce energy consumption as a whole of the system.

As described above, according to this embodiment, since the number of cooling towers in each operation mode of the refrigerator operation, the intermediate operation, and the precooling operation can be controlled, the required energy consumption is reduced by operating the minimum number of cooling towers 42A to 42H. You can.

In the embodiment described above, the inverters may be controlled using the refrigerators 44X, 44Y, 44Z as turbo chillers. In this case, it becomes possible to reduce the energy consumption of the refrigerators 44X, 44Y, 44Z.

In the above-described embodiment, the rotation speed of the pumps 50X, 50Y, 50Z, 52X, 52Y, 52Z, 58X, 58Y, 58Z may be controlled by an inverter. Accordingly, the flow rate of the cooling water can be controlled to reduce the energy consumed in the circulation of the cooling water.

On the other hand, the above-described embodiment is an example in which pipes are connected so that the number of cooling towers of each of the load units 24X, 24Y, 24Z is two, two or one during the intermediate operation or the precooling operation. Without limiting, various suns are possible. For example, FIG. 3 is an example in which the number of cooling towers of the load part 24X can be increased. In the air conditioning system shown in the figure, bypass pipes 80 and 82 are provided so that one end (right end in the drawing) of the pipe 80 is connected to the pipe x6, and the other end (left end in the drawing) is branched, respectively. It is connected to the main pipe j2 so that communication with (a2, b2, c2) is possible. One end (right end in the drawing) of the pipe 82 is connected to the pipe x5, and the other end (left end in the drawing) is branched so that each of the main pipes j1 can communicate with the pipes a1, b1, and c1. Is connected to. In addition, open / close valves 84 are provided at branched portions of the pipes 80 and branched portions of the pipes 82, respectively, so that the cooling towers 42A, 42B, and 42C are respectively connected to the pipes (opening / closing valves 84). It communicates with or is interrupted by the load part 24X through x5 and x6. Each open / close valve 84 is electrically connected to the control device 70, and is controlled by the control device 70. Therefore, the control apparatus 70 can select whether to operate the cooling towers 42A, 42B, and 42C for the load part 24X.

In the air conditioning system of FIG. 3 configured as described above, 5 of the cooling towers 42A, 42B, 42C, 42G, and 42H are operated while the two units of the cooling towers 42E and 42F are operated for the load portion 24Y during precooling. The stand can be operated for the load part 24X, and the number of cooling towers for the load part 24X can be controlled with 0 to 5 units. Moreover, when the precooling operation | movement of the load part 24Y and the load part 24Z is stopped, the number of cooling towers for the load part 24X can also be controlled to 0-8. Therefore, according to this embodiment, the number of cooling towers for the load part 24X can be increased, and precooling operation can be performed for a long time.

FIG. 4 shows a modification of the air conditioning system 10 of FIG. The air conditioning system shown in the drawing has a system configuration in which the intermediate portion and the precooling operation are not performed in the load section 24Z. That is, the air conditioning system of FIG. 4 is a cooling tower 42D, pipes (d1, d2, z5, z6), on / off valves 60Z, 62Z, 63Z, and 3-way compared to the air conditioning system 10 of FIG. There is no valve 64Z and bypass pipe 66Z, and the structure is reduced in cost. Moreover, the connection position of the piping y5 and the main piping j1, and the connection position of the piping y6 and the main piping j2 differ.

As an example of the operation of the air conditioning system of FIG. 4 configured as described above, the refrigerator operation is performed in all the load portions 24X, 24Y, 24Z, for example, at a time when the outside air temperature is high (for example, June to September). At that time, the number of cooling towers is controlled to six units (42A, 42B, 42C, 42E, 42F, and 42G), especially when the outside air temperature is high (eg July and August), and when the outside air temperature is slightly lower (for example, In June and September, the number of cooling towers is controlled by five units (42A, 42B, 42C, 42E and 42F). In addition, control of the number of cooling towers is performed by controlling the opening / closing valve 68 and cooling towers 42A-42H by the control apparatus 70 similarly to the air conditioning system of FIG. 1 mentioned above.

When the outside air temperature is slightly lower than during the freezer operation (for example, May and October), the freezing operation is performed in the load portions 24Y and 24Z, while the load portion 24X switches to the precooling operation. At that time, three of the cooling towers 42A to 42C communicate with the condensers 46Y and 46Z of the refrigerators 44Y and 44Z, and are used to operate the refrigerators of the load portions 24Y and 24Z. In addition, four of the cooling towers 42E-42H are used for the precooling operation of the load part 24X.

Pre-cooling is performed in the load part 24X, 24Y at the time (For example, November-April) when the outside air temperature fell. At that time, the number of cooling towers may be changed in accordance with the outside temperature. Specifically, during the period when the outside air temperature is slightly high (for example, November and April), the number of cooling towers of the load unit 24Y is increased to five units 42A, 42B, 42C, 42E, and 42F, and the cooling tower of the load unit 24X is used. Reduce the number to 2 units (42G, 42H). In addition, during the period when the outside air temperature is low (for example, from December to March), the number of cooling towers of the load part 24Y is reduced to four units 42A, 42B, 42C, and 42E, thereby reducing the number of cooling towers of the load part 24X. Increase to band 42F, 42G, 42H.

Moreover, what is necessary is just to determine the said operation pattern based on the external air wet bulb temperature and the load conditions of the load part 24X-24Z. For example, the switching control of the number may be performed by the optimization calculation of the number and system which used the energy consumption evaluation function as the function of evaluating the wet bulb temperature and load conditions. In addition, the operation results may be tabulated and controlled.

(2nd embodiment)

FIG. 5 is a system diagram schematically showing the configuration of the air conditioning system 11 of the second embodiment. The air conditioning system 11 shown in the same figure is a system which air-conditions the load part 24 of one system. In addition, about the member which has the structure and effect | action similar to 1st Embodiment shown in FIG. 1, the same code | symbol (except X-Z) is attached, and the description is abbreviate | omitted.

The air conditioning system 11 shown in FIG. 5 is equipped with one refrigerator 44 and three cooling towers 42A-42C. The condenser 46 of the refrigerator 44 is connected to each cooling tower 42A-42C, and the cooling towers 42A-42C are connected in parallel with the condenser 46. As shown in FIG. That is, the cooling water outlet pipes a1 to c1 are connected to the cooling towers 42A to 42C. After the pipes a1 to c1 are connected to the main pipe j1, the main pipe j1 is connected to the condenser 46. . The main pipe j2 connected to the condenser 46 branches to the cooling water outflow pipes a2 to c2, and the pipes a2 to c2 are connected to the respective cooling towers 42A to 42C. Moreover, the pump 52 is arrange | positioned in the main pipe j1, and by driving this pump 52, cooling water circulates between cooling tower 42A-42C and the condenser 46, and the circulation amount is adjusted. In addition, a three-way valve 54 is installed in the main pipe j2 so that a part of the cooling water flowing through the main pipe j2 flows into the main pipe j1 through the bypass pipe 56 to adjust the flow rate.

The evaporator 48 of the refrigerator 44 is connected to the load section 24 through the pipes k3 and k4. The pump 52 is connected to the pipe k3. Thereby, the cooling water cooled by the evaporator 48 can be circulatedly supplied to the load part 24.

Cooling towers 42A to 42C are connected in series to the evaporator 48. That is, the pipe k3 is connected to the main pipe j2 through the pipe k6 and to the main pipe j1 through the pipe k5. Therefore, the cooling water flowing through the pipe k3 flows through at least one of the cooling towers 42A to 42C through the pipe k6 and the main pipe j2 and returns to the original pipe k3 through the main pipe j1 and the pipe k5. Goes. As a result, the cooling towers 42A to 42C are connected in series with the evaporator 48 of the refrigerator 44. A pump 58 is provided in the pipe k6, and the coolant in the pipe k3 flows into the pipe k6 by driving the pump 58. In addition, the shutoff valves 60 and 62 are provided in the piping k3 and the piping k6 just downstream of the connection part. In addition, the on-off valve 63 is installed in the pipe k5. By opening / closing these open / close valves 60, 62, and 63, it is possible to select whether or not to cool the cooling water in the pipe k3 to the cooling towers 42A to 42C. In addition, a 3-way valve 64 is disposed in the pipe k6 so that a part of the coolant flowing through the pipe k6 flows into the pipe k5 through the bypass pipe 66 by operating the 3-way valve 64. Flow rate adjustment is performed.

A plurality of on-off valves 68 for selecting cooling towers 42A to 42C are disposed in the main pipes j1 and j2 described above. The on-off valve 68 is disposed between the connecting portions to which the pipes a1 to c1 are connected on the main pipe j1 or between the connecting parts to which the pipes a2 to c2 are connected on the main pipe j2. By opening and closing either of these on / off valves 68, cooling towers 42A to 42C through which the cooling water circulates can be selected. The opening and closing operation of the on-off valve 68 is performed by the control device 70.

The control apparatus 70 is connected to the sensor 72 which measures the wet bulb temperature of the outside air, and the measurement data of the outside air temperature is input from the sensor 72. Moreover, the control apparatus 70 is connected to the load part 24, and data of a load condition is input from the load part 24. As shown in FIG. Moreover, the control apparatus 70 is connected to the drive apparatus (not shown), such as the fan of cooling tower 42A-42C, and can control the start and stop of cooling tower 42A-42C. The controller 70 determines the flow rate of the cooling water which becomes the minimum required by simulation from the data of the outside temperature and the load condition, and determines the cooling towers 42A to 42C that are operable to supply the cooling water according to the flow rate. The cooling towers 42A to 42C are operated, and the on / off valve 68 is controlled to circulate the cooling water through the cooling towers 42A to 42C. Moreover, the cooling towers 42A-42C are stopped about cooling towers 42A-42C which do not need to flow cooling water.

Next, the operation method of the air conditioning system 11 comprised as mentioned above is demonstrated.

In summer, when the outside air temperature is high, a freezer operation using the freezer 44 as a cold heat source is performed. In the freezer operation, the on-off valve 60 is opened and the on-off valves 62 and 63 are closed. As a result, a conduit configuration as shown in FIG. 6A is formed. As shown in the figure, the cooling towers 42A to 42C are connected to the condenser 46 of the refrigerator 44 so that the cooling water cooled in the cooling towers 42A to 42C is circulated and supplied to the condenser 46, and The evaporator 48 and the load part 24 are connected, and the cooling water cooled by the evaporator 48 is supplied to the load part 24. Therefore, it is possible to supply cold heat to the load unit 24 using the refrigerator 44 as a cold heat source. At this time, it is also possible to control the number of cooling towers 42A to 42C to be used by opening and closing any of the on / off valves 68.

In the intermediate operation, the on / off valves 62 and 63 are opened and the on / off valve 60 is closed. Accordingly, since some of the cooling towers 42A to 42C and the evaporator 48 are connected in series, the cooling water is first cooled in a portion of the cooling towers 42A to 42C, and then cooled in the evaporator 48 to be supplied to the load unit 24. . Therefore, a part of cooling tower 42A-42C and the refrigerator 44 can be used together as a cooling heat source. In addition, in the intermediate operation, the remaining part of the cooling towers 42A to 42C and the condenser 46 of the freezer 44 are connected, and the cooling water cooled in the remaining part of the cooling towers 42A to 42C is circulated and supplied to the condenser 46 so as to provide a freezer. Used for cooling 44. It is possible to control the number of cooling towers 42A to 42C to be used by opening or closing any of the on-off valves 68 even during the intermediate operation. As an example, FIG. 6B shows an example in which the shut-off valve 68 is closed between the cooling tower 42A and the cooling tower 42B and between the cooling tower 42B and the cooling tower 42C. In this example, since one of the cooling towers 42C is connected in series to the evaporator 48 of the refrigerator 44, the number of preliminary cooling towers is one. Moreover, since one of the cooling towers 42A is connected to the condenser 46 of the refrigerator 44, the number of cooling towers used as a cooling means of the refrigerator 44 is controlled by one. Moreover, the above is an example, and by changing the positions of the closing valve 68, the number of preliminary cooling towers and the number of cooling towers for freezer cooling can be controlled separately.

In winter, when the outside air temperature is low, precooling operation is performed using any of the cooling towers 42A to 42C as a cooling heat source. In this precooling operation, the shut-off valve 60 is closed. Thereby, the cooling towers 42A-42C are connected to the load part 24 similarly to the intermediate operation. At this time, the operation of the refrigerator 44 is stopped. Therefore, the cooling water cooled by the cooling towers 42A-42C is circulatedly supplied to the load part 24, and the precooling operation which makes the cooling towers 42A-42C the cooling heat source is performed. In addition, the number of cooling towers 42A to 42C to be used can be controlled by opening or closing any of the on-off valves 68 even during precooling operation. For example, as shown in FIG. 6C, two cooling towers 42B and 42C can be used for precooling operation.

Thus, according to this embodiment, since the number of cooling towers in each operation mode of a refrigerator operation, an intermediate operation, and a precooling operation can be controlled, energy consumption can be reduced by operating the minimum required number of cooling towers 42A-42C. have.

In addition, although the number of movable towers of the cooling tower was controlled in 1st and 2nd embodiment mentioned above, you may make it change the allocation number of a cooling water circulation destination, operating all the cooling towers.

(Third embodiment)

FIG. 7 is a system diagram schematically showing the configuration of the air conditioning system 10 of the third embodiment. The air conditioning system 10 shown in the same figure is a system which air-conditions the load part 24 of one system. In addition, about the member which has the structure and effect | action similar to 1st Embodiment shown in FIG. 1, the same code | symbol may be attached | subjected and the description may be abbreviate | omitted.

Compared with the first embodiment, except for the number of cooling towers and freezers, the third embodiment is an open cooling tower in which the cooling tower is provided with a heat exchanger, and the load portion is one system.

The air conditioning system 10 shown in FIG. 7 includes two refrigerators 44X and 44Y, five cooling towers 42A to 42E, and precooling heat exchangers 80X and 80Y connected to the cooling towers 42A to 42E. Equipped. In the present embodiment, the cooling towers 42A to 42E are configured as open cooling towers. The open cooling tower includes a watering pipe for spraying the cooling water and a water collecting part for collecting the water for the cooling water. When the cooling towers 42A to 42E are set to open cooling, in operation in the refrigerators 44X and 44Y, the cooling water temperature of the refrigerators 44X and 44Y is lower than that of the closed cooling towers, and the resultant coefficients of the refrigerators 44X and 44Y are lower. It improves and saves energy. In addition, the open cooling tower can reduce the installation area compared to the closed cooling tower can lower the cost.

The connection relationship between the heat exchangers 80V and 80Y, the cooling towers 42A-42E, and the load part 24 is demonstrated. Cooling water outflow pipes a1 to e1 are connected to the cooling towers 42A to 42E, and the pipes a1 to e1 are connected to the main pipe j1. The main pipe j1 is branched into the pipes x5 and y5 and then connected to the heat exchangers 80X and 80Y.

Cooling water outflow pipes x6 and y6 are connected to the heat exchangers 80X and 80Y, and these pipes x6 and y6 are connected to the main pipe j2. The main pipe j2 is branched into the pipes a2 to e2 and connected to the sprinkling pipe (not shown) of each cooling tower 42A to 42E. Pumps 59x and 59y are disposed in the pipes x5 and y5, respectively. By individually driving and controlling the pumps 59x and 59y, the cooling water is circulated separately between the respective heat exchangers 80X and 80Y and the cooling towers 42A to 42E.

The pipe x7 and the pipe x8 are connected to the heat exchanger 80X. The pipe x7 is connected to the pipe x3, and the pipe x8 is connected to the pipes x3 and x4. In addition, a pipe y7 and a pipe y8 are connected to the heat exchanger 80Y. The pipe y7 is connected to the pipe y3, and the pipe y8 is connected to the pipe y4. And the heat exchanger 80X is connected to the load part 24 through piping x3, x4, x7, x8. The heat exchanger 80Y is connected to the load portion 24 through the pipes y3, y4, y7, y8.

The pump 58X is arrange | positioned at the piping x7, and the pump 58Y is arrange | positioned at the piping y7. By driving the pump 58X, cold water can be circulated between the heat exchanger 80X and the load part 24. Similarly, by driving the pump 58Y, cold water can be circulated between the heat exchanger 80Y and the load part 24.

Open / close valve 60X is provided in pipe x3, open / close valve 62X is provided in pipe x7, and open / close valve 63X is provided in pipe x8. By opening / closing these open / close valves 60X, 62X, and 63X, it is selected whether to flow the cooling water in the pipes x3 and x4 to the heat exchanger 80X or to the freezer 44X.

Similarly, the on-off valve 60Y is installed in the pipe y3, the on-off valve 62Y is installed in the pipe y7, and the on-off valve 63Y is installed in the pipe y8. By opening / closing these open / close valves 60Y, 62Y, and 63Y, it is selected whether to flow cold water in the pipes y3 and y4 to the heat exchanger 80Y or to the freezer 44Y.

Next, the connection relationship between the refrigerators 44X and 44Y, the cooling towers 42A-42E, and the load part 24 is demonstrated. The freezers 44X and 44Y are respectively provided with condensers 46X and 46Y and evaporators 48X and 48Y, respectively. The evaporator 48X is connected to the load portion 24 through the pipes x3 and x4. In addition, the evaporator 48Y is connected to the load part 24 via the piping y3 and y4.

The condensers 46X and 46Y of the refrigerators 44X and 44Y are connected to the cooling towers 42A to 42E, respectively. Cooling towers 42A to 42E are connected in parallel to the condensers 46X and 46Y. Cooling water outflow piping a1-e1 is connected to cooling tower 42A-42E, and this piping a1-e1 is connected to main piping j1. The main pipe j1 is branched into the pipes x1 and y1 and then connected to each condenser 46X, 46Y. The condenser 46X, 46Y is connected to the cooling water outflow pipes x2 and y2, and these pipes x2 and y2 are connected to the main pipe j2. The main pipe j2 is branched into the pipes a2 to e2 and connected to the sprinkling pipe (not shown) of each cooling tower 42A to 42E. As a result, the cooling water cooled in each of the cooling towers 42A to 42E can be circulated and supplied to the condensers 46X and 46Y, and the cooling towers 42A to 42E can be used as the cooling means of the refrigerators 44X and 44Y.

Pumps 52x and 52y are disposed in the pipes x1 and y1, respectively. By individually driving and controlling these pumps 52x and 52y, cooling water is circulated individually to each condenser 46X and 46Y, and the circulation amount is adjusted.

The evaporator 48X of the refrigerator 44X is connected to the load portion 24 through the pipes x3 and x4. A pump 50X is disposed in the pipe x3 and the cold water is circulated between the evaporator 48X and the load part 24 by driving the pump 50X. Similarly, the evaporator 48Y of the refrigerator 44Y is connected to the load portion 24 through the pipes y3 and y4. A pump 50Y is disposed in the pipe y3 and the cold water is circulated between the evaporator 48Y and the load part 24 by driving the pump 50Y.

Pipes a1 to e1 are connected to the main pipe j1, pipes a2 to e2 are connected to the main pipe j2, and the cooling towers 42A to 42E described above are connected in parallel with the refrigerators 44X and 44Y. . Similarly, the cooling towers 42A to 42E are connected in parallel with the heat exchangers 80X and 80Y. In the present embodiment, the main pipes j1 and j2 form a circulation path of the cooling water common to the heat exchangers 80X and 80Y and the freezers 44X and 44Y.

The main pipes j1 and j2 described above are provided with a plurality of on-off valves 68 for selecting the cooling towers 42A to 42E. The on-off valve 68 is disposed between the connecting parts to which the pipes a1 to e1 are connected on the main pipe j1 or between the connecting parts to which the pipes a2 to e2 are connected on the main pipe j2. . By opening and closing either of these on / off valves 68, the cooling towers 42A-42E through which cooling water circulates can be selected. The opening and closing operation of the on-off valve 68 is performed by the control device 70.

The control apparatus 70 is connected to the sensor 72 which measures the wet bulb temperature of the outside air, and the measurement data of the outside air temperature is input from the sensor 72. Moreover, the control apparatus 70 is connected to the load part 24, and data of a load condition is input from the load part 24. As shown in FIG. In addition, the control device 70 is connected to a driving device (not shown), such as a fan of the cooling towers 42A to 42E, so that the start and stop of the cooling towers 42A to 42E can be controlled. The controller 70 determines the cooling towers 42A to 42E that are operated by simulation from the data of the outside temperature and the load conditions. The cooling towers 42A to 42E are operated, and the on / off valve 68 is controlled to circulate the cooling water to the cooling towers 42A to 42E. Moreover, the cooling towers 42A-42E are stopped about cooling towers 42A-42E which do not need to flow cooling water.

In addition, the controller 70 controls each of the inverters installed in the fans and pumps 50X, 50Y, 52X, 52Y, 58X, 58Y, 59X, 59Y of the cooling towers 42A to 42E to control the total consumption of the refrigerator, the fan or the pump. The power is driven to the minimum value.

The control is performed as follows as an example. Initially, the wet-bulb temperature of the outside air, the load, the coolant temperature at the outlet of the cooling towers 42A to 42E, and the cold water temperature at the outlet of the heat exchangers 80X and 80Y are input values. Input value data is input to the simulator which performs the simulation which calculates the sum total of power consumption, such as a fan and a pump (50X, 50Y, 52X, 52Y, 58X, 58Y, 59X, 59Y). At this time, input value data is input to the simulator while changing the input values of the coolant temperature and the cold water temperature. From the results of the simulation, the frequencies (speeds) of the pumps, such as the fans of the cooling towers 42A to 42E and the pumps 50X, 50Y, 52X, 52Y, 58X, 58Y, 59X, 59Y, whose total value of power consumption is minimized. Is obtained as the optimal value. The controller 70 sets the actual cooling water temperature and the cold water temperature to the optimum values obtained. The controller 70 controls the inverters of the cooling pumps 52X, 52Y, 59X, 59Y and the cold water pumps 50X, 50Y in response to changes in the wet bulb temperature and cooling load of the outside air. Energy consumption is realized by changing the flow rate.

In the system running the freezer, a simulator that calculates the total power consumption of the freezer, cooling tower, cooling water pump, and cold water pump is used to acquire the cooling water pump frequency, the cooling water temperature, and the cold water temperature, which minimize the total power consumption. To control the cooling tower fans or pumps.

Next, the operation method of the air conditioning system 10 comprised as mentioned above is demonstrated. In summer, when the outside air temperature is high, a freezer operation is performed using the freezers 44X and 44Y as a cold heat source. In the freezer operation, the on-off valves 60X, 60Y are opened and the on-off valves 62X, 62Y, 63X, 63Y are closed. As a result, a conduit configuration as shown in FIG. 8A is formed. As shown in the figure, cooling towers 42A to 42E are connected to condensers 46X and 46Y of refrigerators 44X and 44Y. By driving the pumps 52X and 52Y, the cooling water cooled in the cooling towers 42A to 42E is circulated and supplied to the condensers 46X and 46Y. The evaporators 48X and 48Y of the refrigerators 44X and 44Y and the load part 24 are connected. The cold water cooled by the evaporators 48X and 48Y is supplied to the load part 24 by driving the pumps 50X and 50Y. Therefore, cold heat can be supplied to the load part 24 using the refrigerators 44X and 44Y as a cold heat source. At this time, it is also possible to control the number of cooling towers 42A to 42E to be used by opening and closing any of the on / off valves 68.

In winter, when the outside air temperature is low, precooling operation is performed using any of the cooling towers 42A to 42E as a cooling heat source. In this precooling operation, the pumps 50X, 50Y are stopped, the on / off valves 60X, 60Y are closed and the on / off valves 62X, 62Y, 63X, 63Y are opened. The pressure loss of the on / off valves 63X, 63Y Since it is less than the pressure loss of 50X and 50Y, the cold water from heat exchanger 80X and 80Y flows into piping x8 and y8, and flows back to the load part 24 through on / off valve 63X and 63Y again. As a result, the cooling towers 42A to 42E are connected to the heat exchangers 80X and 80Y, and the heat exchangers 80X and 80Y are connected to the load section 24. At this time, the operation of the refrigerators 44X and 44Y is stopped. By driving the pumps 59X and 59Y, the cooling water cooled by the cooling towers 42A to 42E is circulated and supplied to the heat exchangers 80X and 80Y. The coolant cooled by the heat exchangers 80X and 80Y is supplied to the load part 24 by driving the pumps 58X and 58Y. In addition, the number of cooling towers 42A to 42E to be used can be controlled by opening or closing any of the on / off valves 68 during the precooling operation. For example, as shown in FIG. 8B, three cooling towers 42C-42E can be used for precooling operation.

Next, the intermediate operation | movement performed at the outdoor air temperature between summer and winter is demonstrated with reference to FIG. The intermediate operation switches the cooling tower to the freezer side and the precooling heat exchanger side. That is, operation | movement which uses the refrigerators 44X and 44Y and a part of cooling towers 42A-42E as a cooling heat source is used. The opening / closing valve 68 on the inlet side and the opening / closing valve 68 on the outlet side between the cooling tower 42B and the cooling tower 42C are closed. The switching to the switching valve 68 between the cooling tower 42A and the cooling tower 42B and the switching valve 68 between the cooling tower 42C and the RHK cooling tower 42D is performed by the outside air temperature or load conditions. Close the shutoff valves 60X, 63X, 60Y, 63Y and open the shutoff valves 62X, 62Y. As a result, a path for passing water to the freezer is formed at the rear end of the precooling heat exchanger. Therefore, the cold water is circulated and supplied to the evaporator 48x through the pipes x3 and x7, the heat exchanger 80x, and the pipes x8, x3 and x4 as indicated by the arrows. Similarly, cold water is circulated and supplied to the evaporator 48y through the pipes y3 and y7, the heat exchanger 80y, and the pipes y8, y3 and y4 as indicated by the arrows.

Thus, according to this embodiment, since the number of cooling towers in each operation mode of a freezer operation, an intermediate operation, and a precooling operation can be controlled, energy consumption can be reduced by operating the minimum required number of cooling towers 42A-42E. have.

In addition, the piping system including the on-off valves 63X and 63Y is eliminated, that is, the pipe connecting the pipe x3 and the pipe x4, and the pipe connecting the pipe y3 and the pipe y4, are removed. Similarly, in the case of the intermediate operation during the precooling operation, cold water may be passed through the freezer to cope with the freezer operation, the intermediate operation, and the precooling operation.

FIG. 10 shows a modification of the air conditioning system 10 of FIG. The air conditioning system shown in FIG. 10 is provided with the piping system which can switch the cooling water system which passes through every cooling tower.

As shown in FIG. 10, the main pipe j1 is connected to the refrigerators 44X and 44Y through the pipes x2 and y2. The main pipe j2 is connected to the refrigerators 44X and 44Y through the pipes x1 and y1. The pipes a1 to e1 are connected to the main pipe j1, and the cooling towers 42A to 42E and the main pipe j1 are connected to each other via the pipes a1 to e1. On-off valves 68 are provided in the pipes a1 to e1, respectively. Pipes a2 to e2 are connected to the main pipe j2, and the cooling towers 42A to 42E and the main pipe j2 are connected through the pipes a2 to e2. On-off valves 68 are provided in the pipes a2 to e2, respectively.

On the other hand, the main pipe j3 is connected to the heat exchangers 80X and 80Y through the pipes x5 and y5. In addition, the main pipe j4 is connected to the heat exchangers 80X and 80Y through the pipes x6 and y6. Pipes a3 to e3 are connected to the main pipe j3, and the cooling towers 42A to 42E and the main pipe j3 are connected to each other via the pipes a3 to e3. On-off valves 68 are provided in the pipes a3 to e3, respectively. Pipes a4 to e4 are connected to the main pipe j4, and the cooling towers 42A to 42E and the main pipe j4 are connected to each other via the pipes a4 to e4. On-off valves 68 are provided in the pipes a4 to e4, respectively.

In the present embodiment, a circulation path is formed between the refrigerators 44X and 44Y and the cooling towers 42A to 42E by the main pipes j1 and j2, and the heat exchangers 80X and 80Y and the cooling tower are formed by the main pipes j3 and j4. A circulation path is formed between 42A-42E.

By opening or closing any of the plurality of on / off valves 68 provided in the pipes a1 to e1, a2 to e2, a3 to e3, a4 to e4, the cooling water is supplied to the freezers 44X and 44Y for each of the cooling towers 42A to 42E. Any of the precooling heat exchangers 80X and 80Y can be selected.

With such a configuration, the number of on-off valves through which the coolant passes when the coolant passes through the pipe can be minimized. As a result, the pipe resistance is reduced, and the power of the pump can be reduced. In the present embodiment, the cooling water from the cooling towers 42A to 42E can be passed through the main pipe j1 or the main pipe j3 only by passing through one open / close valve 68.

On the other hand, in the cooling tower farther than the heat exchanger in the configuration shown in FIG. For example, the cooling water of the cooling tower 42A passes through the plurality of open / close valves 68 and is passed through to the heat exchangers 80X and 80Y.

In addition, in the air conditioning system 10 shown in FIG. 10, it can carry out water regardless of the order from a heat exchanger or a freezer. Therefore, the degree of freedom in selecting a cooling tower to be switched to the heat exchanger system and the refrigerator system is increased. Furthermore, the branch of the inlet and outlet of the cooling tower may be branched.

1 is a system diagram schematically showing the configuration of an air conditioning system of a first embodiment;

2A and 2B are diagrams schematically showing a conduit configuration for each operation mode;

3 is a system diagram showing an air conditioning system having a piping configuration different from that of FIG. 1;

4 is a system diagram showing a modification of the air conditioning system of FIG. 1;

5 is a system diagram schematically showing a configuration of an air conditioning system according to a second embodiment;

6A to 6C are diagrams schematically showing a conduit configuration for each operation mode;

7 is a system diagram schematically showing the configuration of an air conditioning system according to a third embodiment;

8A and 8B are diagrams schematically showing a conduit configuration for each operation mode;

9 is a diagram schematically showing a conduit configuration for each operation mode;

FIG. 10 is a system diagram showing a modification of the air conditioning system of FIG. 7.

Description of the Related Art

10: air conditioning system 12: clean room equipment

24X, 24Y, 24Z: Load part 42A to 42H: Cooling tower

44X, 44Y, 44Z: Refrigerator 46X, 46Y, 46Z: Condenser

48X, 48Y, 48Z: evaporator 68: on / off valve

Claims (9)

An air conditioning method comprising a refrigerator operation using a freezer supplied with cooling water cooled by a plurality of cooling towers as a cold heat source, and a precooling operation using at least a portion of the plurality of cooling towers as a cold heat source, wherein the cooling tower is operated during the precooling operation. An air conditioning method, characterized in that for controlling the number of operations. The air conditioner according to claim 1, wherein at least a part of the plurality of cooling towers is used together with the refrigerator as a cooling heat source, and an operation number of the cooling towers serving as the cooling heat source is controlled during the intermediate operation. Way. The air conditioning method according to claim 1, wherein the switching of the operation is performed in accordance with an ambient temperature and an air load condition. The air conditioning method according to claim 1, wherein a plurality of the refrigerators are provided and the number of movable towers of the cooling tower is controlled for the plurality of refrigerators, respectively. The air conditioning method according to claim 1, wherein the refrigerator is a turbo refrigerator and performs inverter control. The air conditioning method according to claim 1, wherein the flow rate of the cooling water is controlled by controlling the rotation speed of the pump circulating the cooling water cooled by the plurality of cooling towers or the freezer. A plurality of cooling towers for cooling the cooling water, A refrigerator having a condenser and an evaporator, A circulation line for a refrigerator operation for circulating the cooling water cooled in the cooling tower to the condenser and circulating the cooling water cooled in the evaporator to the air conditioning load unit; A precooling operation circulation line configured to circulate the cooling water cooled by the cooling tower to the air conditioning load unit; Line switching means for controlling the number of cooling towers connected to the precooling operation circulation line while switching the freezer operation circulation line and the precooling operation circulation line; And an apparatus for controlling the operation and stop of the plurality of cooling towers while controlling the line switching means. 8. An intermediate operation circulation line for connecting the plurality of cooling towers in series to the evaporator of the refrigerator, wherein the line switching means includes an intermediate operation circulation line to simultaneously switch the line change. An air conditioning system, characterized by changing the number of cooling towers connected to a circulation line for intermediate operation. 8. The air conditioning system according to claim 7, wherein a plurality of the refrigerators are installed and the number of the cooling towers connected to each refrigerator is changed to the line switching means.

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