JPH11304384A - Chiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by enhancing the operating efficiency of a heat exchanger producing cooling water utilizing the outer air. SOLUTION: The chiller comprises a heat storage tank 11 and a heat exchanger 12 wherein the cooling water from the low temperature tank 11c in the heat storage tank 11 used for cooling a load 13 is fed to the heat exchanger 12 when the outer air temperature is,lower than 10-13 deg.C otherwise fed to the high temperature tank 11a. The water cooled by the heat exchanger 12 is fed to the low temperature tank 11c when it is lower than 5-8 deg.C otherwise fed to the high temperature tank 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water producing apparatus for cooling water by utilizing a temperature difference between outside air temperature and water temperature, that is, a cooling apparatus having a heat exchanger.

[0002]

2. Description of the Related Art FIG. 2 is a schematic diagram showing an example of a conventional cooling apparatus using a plate heat exchanger.

A cooling device 100 shown in FIG.
1 and a heat exchanger 102 for producing cooling water using outside air
, A refrigerator 104 and an independent refrigerator 105.

The heat storage tank 101 comprises a high temperature tank 101a, a medium temperature tank 101b, and a low temperature tank 101c.
1a, the intermediate temperature tank 101b, and the low temperature tank 101c are each partitioned by a weir 110 that allows water to move therebetween. Further, the low temperature tank 101c and the high temperature tank 10
1a is connected via a load 103 to be cooled.

Here, the water in the low-temperature tank 101c is set to a low temperature necessary to cool the load 103 to be cooled, for example, 5 to 8 ° C. Cool, used and relatively hot.

The heat exchanger 102 is connected to a heat release device 106, a so-called cooling tower, by a connecting pipe 203. In the heat release device 106, the ventilation from the outside air is performed by a fan 106a in response to precipitation from a precipitation pipe 106p. The heat is released to the outside by repeating the precipitation and the circulation of water. The water cooled by this is sent to the heat exchanger 102 via the connecting pipe 204 by the pump 400.

[0007] The refrigerator 104 cools water with a refrigerant, and is connected to the heat release device 106. Here, the heat exchanger 102 and the refrigerator 104 are selectively used by opening and closing valves 301 and 302.

The independent refrigerator 105 is provided with the heat exchanger 102
In addition, regardless of the operation state of the refrigerator 104, the refrigerator 104 operates independently.

The operation of the cooling device 100 when cooling the load 103 using the cooling device 100 shown in FIG. 2 will be described below.

First, the pump 401 is moved from the low-temperature tank 101c.
Thus, for example, cold water of about 5 to 8 ° C. is pumped up, sent to the load 103 to be cooled by the cold water supply pipe 201, and cooled. Here, the used water after cooling becomes approximately 16 ° C. to 18 ° C.
It is sent to the high temperature bath 101a. At this time, the heat storage tank 10
1, the movement of water flows from the low-temperature tank 101c to the high-temperature tank 101a.
It will be about 6 ° C.

Here, when the temperature of the outside air is low, for example, about 4 ° C. or less, the heat exchanger 102 for producing cooling water using the outside air is used, and the refrigerator 104 is not used. That is, the valves 302, 304, 30
6, 308 are closed and valves 301, 303, 305, 3
07 is opened, and water is sent from the high temperature tank 101a to the heat exchanger 102 via the supply pipe 205 by the pump 402. Here, when the water is cooled by the outside air and cooled to 5-8 ° C., for example, about 7 ° C., which is low enough to cool the load 103 again, the low-temperature tank 1
01c.

On the other hand, when the temperature of the outside air is relatively high, for example, higher than 4 ° C., the cooling water cannot be produced using the outside air by the heat exchanger 102, so that the heat exchanger 10
2 is not used, and the refrigerator 104 is used instead. That is, the valves 302, 304, 306, and 308 are opened,
The valves 301, 303, 305, 307 are closed. Then, water is sent from the high-temperature tank 101a to the refrigerator 104 via the supply pipe 207 by the pump 402 to cool the water,
Heat is released to the outside by the heat release device 106. And
When the water is cooled to a low temperature of 5 to 8 ° C, for example, about 7 ° C, which is low enough to cool the load 103, the delivery pipe 2
08 to the low-temperature tank 101c.

Further, since the amount of water in the heat storage tank 101 is large, the operation efficiency of the external cooling device 100 is
Water is cooled by an independent refrigerator 105 that operates independently of the operation states of the heat exchanger 102 and the refrigerator 104. That is, water is sent from the high-temperature bath 101a to the single refrigerator 105 via the supply pipe 209 by the pump 403, where the water is cooled, and heat is released to the outside by the heat release device 107. Then, when the water is cooled to a low temperature of 5 to 8 ° C., for example, about 7 ° C., which is low enough to cool the load 103, the water is sent to the low-temperature tank 101 c via the delivery pipe 210.

The load 103 is cooled by repeatedly circulating the water as described above.

[0015]

However, in the above-described conventional cooling apparatus 100, a heat exchanger 102 for performing cooling using a temperature difference between the outside air temperature and the water temperature and a refrigerator 104 are used in combination. Therefore, in order to produce cold water at a low temperature required to cool the load 103, for example, 5 to 8 ° C., the heat exchanger 102 cannot be operated unless the temperature of the outside air is about 4 ° C. or less. Bad rate.

Therefore, in the present invention, the heat exchanger for cooling water by the outside air is used not only when the temperature of the outside air is low, for example, about 4 ° C. or less, but also when the temperature is relatively high. The cooling device 1
00, and the manufacturing cost of the cooling device itself is reduced.

[0017]

The cooling device of the present invention has a heat storage tank and a heat exchanger of a cooling water producing device, wherein the heat storage tank has at least a high temperature tank and a low temperature tank, A first control valve having a function of sending water, which has cooled a load to be cooled by cold water from a low-temperature tank, to one of a heat exchanger and a high-temperature tank according to the outside air temperature, A sensor for sensing the temperature of the water cooled by the heat exchanger, and a second control valve having a function of selecting and sending either a low-temperature tank or a high-temperature tank based on the water temperature sensed by the sensor. Shall be provided.

In the cooling device of the present invention, when the temperature of the outside air is equal to or lower than the predetermined temperature T ₁ ° C, the water after cooling the load is supplied to the heat exchanger at a temperature lower than the predetermined temperature T ₁ ° C. If it is also high, it can be sent to a hot bath. This setting of T ₁ ° C can be set in consideration of the difference between the temperature of the water after cooling the load and the temperature of the water. In addition, when the water cooled by the heat exchanger is higher than the predetermined temperature T ₂ ° C, the water can be sent to the high-temperature tank, and when the temperature is equal to or lower than the predetermined temperature T ₂ ° C, the water can be sent to the low-temperature tank. The temperature of the water cooled by the heat exchanger, that is, T ₂ ° C, can be set in consideration of the low temperature required for cooling the load. According to the cooling device of the present invention,
The heat exchanger that cools the water by the outside air can be used not only when the temperature of the outside air is low, for example, about 4 ° C. or less, but also when the temperature is relatively high. Efficiency can be improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an outside air cooling device of the present invention will be described. The cooling device of the present invention is a heat storage tank and an outside air cooling device having a heat exchanger of a cooling water producing device, wherein the heat storage tank has at least a high-temperature tank and a low-temperature tank, and is provided by cold water from the low-temperature tank. A first control valve having a function of sending water that has cooled the load to be cooled to either a heat exchanger or a high-temperature tank according to the outside air temperature, and water cooled by the heat exchanger. Depending on the temperature of the cold bath or
And a second control valve having a function of selecting one of the high-temperature tanks and sending the selected one.

FIG. 1 shows a schematic configuration diagram of an example of the cooling device 1 of the present invention. The cooling device of the present invention is not limited to those having the following structure,
Various combinations are possible.

The cooling device 1 shown in FIG.
A heat storage tank 11 composed of a medium-temperature tank 11b and a low-temperature tank 11c, a heat exchanger 12 of a cooling water producing apparatus, a refrigerator 14, and an independent refrigerator 15 are provided.
a, the first control valve 51 capable of introducing the ring water and selecting the water cooled by the heat exchanger 12 to either the low-temperature tank 11c or the high-temperature tank 11a according to the temperature of the water. It has a second control valve 52 which can be introduced as a second control valve. That is, the first control valve 51 has a function of sending water after cooling the load 13 to be cooled to either the heat exchanger 12 or the high-temperature tank 11c according to the temperature of the outside air, The second control valve 52 has a function of detecting the temperature of the water cooled by the heat exchanger 12 with the sensor 60 and then selecting and sending the water to the low-temperature tank 11c or the high-temperature tank 11a.

The high-temperature tank 11a of the heat storage tank 11 and the medium-temperature tank 1
1b and the low-temperature tank 11c are each partitioned by a weir 70 to which water can move.

The water in the low-temperature tank 11c is set to a low temperature necessary for cooling the load 13 to be cooled by the cold water, for example, 5 to 8 ° C.

The heat exchanger 12 is connected to a heat release device 16, a so-called cooling tower, by a connecting pipe 23. In the heat release device 16, ventilation from outside air is performed by a fan 16 a in response to precipitation from a precipitation pipe 16 p. The heat is released to the outside by repeating the precipitation and the circulation of water. The pump 40 feeds the heat exchanger 12 through the connecting pipe 24.

In the refrigerator 14, the supplied water is cooled by a refrigerant. Here, the heat exchanger 12 and the refrigerator 14 are selectively used by opening and closing the valves 31 and 32.

The independent refrigerator 15 is provided separately from the refrigerator 14, and independently of the operation state of the heat exchanger 12 and the refrigerator 14, cools the water independently of them. Has been made to do. That is, water is supplied from the high-temperature tank 11a to the independent refrigerator 1 via the supply pipe 29 by the pump 43.
5 where the water is cooled and heat is released to the outside by the heat release device 17. Then, when the load 13 is cooled to a low temperature of 5 to 8 ° C., for example, about 7 ° C., which is low enough to cool the load 13, the load 13 is sent to the low-temperature tank 11 c via the delivery pipe 30.

Between the low temperature tank 11c and the high temperature tank 11a,
The load 13 is connected via a load 13 to be cooled.
A first control valve 51 is provided between the first control valve 51 and the high-temperature tank 11a. The first control valve 51 includes a first valve 51
a, a second valve 51b, and a third valve 51c. The first control valve 51 has an outside air temperature T _1.
° C or lower, for example, when it is about 10 to 13 ° C or lower,
The first valve 51a is opened so that water is supplied to the heat exchanger 12.

Here, the setting of T ₁ ° C is set in consideration of the difference between the temperature of the water after cooling the load and the temperature of the water. That is, if the temperature of the water after cooling the load is considerably high, a relatively high temperature can be set in setting the outside air temperature T ₁ ° C required for cooling the load.

The heat exchanger 12 and the low temperature tank 11c are
It is connected to the sensor 60 via the second control valve 52. In this sensor 60 measures the temperature T ₂ is made. In addition, the second control valve 52 includes a first valve 52
a, a second valve 52b and a third valve 52c. The second control valve 52 has a water temperature of T ₂ ° C.
Hereinafter, in this case, when the temperature is low enough to cool the load, for example, about 5 to 8 ° C. or less, the second and third valves 52b and 52c are opened and the low-temperature tank 1 is opened.
When the water temperature is higher than T ₂ ° C., for example, higher than about 8 ° C., the first and second valves 52a and 52b are opened and the third
Is closed so that water is sent to the high-temperature tank 11a.

Using the cooling device 1 shown in FIG.
The operation state of the cooling device when cooling the load 13 will be described below.

First, cold water of, for example, about 5 to 8 ° C. is pumped from the low-temperature tank 11 c by the pump 41, sent to the load 13 to be cooled by the cold water supply pipe 21, and cooled. The used water after cooling the load 13 becomes, for example, about 16 ° C. to 18 ° C.
And reaches the first control valve 51. This first
In the control valve 51, the route of the water ring differs depending on the temperature of the outside air.

(1) When the temperature of the outside air is higher than T ₁ ° C. For example, when it is higher than 10 to 13 ° C, preferably 10 to 12 ° C. In this case, the first valve 51a is closed, and the third valve 51c is opened to guide the ring water to the high-temperature tank 11a. in this case,
Since the temperature of the outside air is high, the production of cold water by the heat exchanger 12 cannot be performed. Therefore, the valves 31, 33, 35 and 37 are closed, the valves 32, 34, 36 and 38 are opened, and the pumps 42 and 43 Pump water,
It is led from the supply pipe 27 to the refrigerator 14, where it is cooled and then led from the delivery pipe 28 to the low-temperature tank 11 c. In addition, it is led from the supply pipe 29 to the independent refrigerator 15, where it is cooled, and the delivery pipe 3
From 0, it is led to the low-temperature tank 11c.

(2) When the outside air temperature is equal to or lower than a predetermined temperature T ₁ ° C. For example, when the temperature is 13 ° C. or less, preferably 10 or less. In this case, the first valve 51a is opened, and the ring water is led to the heat exchanger 12. At this time, the refrigerator 32 is not used, and the valves 32, 34, 36, and 38 are closed. The water cooled by the outside air in the heat exchanger 12 is connected to the connecting pipe 2.
6 and reaches the second control valve 52. This second
The control valve 52 is linked to a sensor 60 for measuring the temperature of the circulating water, and the temperature of the circulating water measured by the sensor 60 is set to a low temperature T ₂ ° C. sufficient to cool the load 13. For example, when the temperature is about 5 to 8 ° C. or lower, the first valve 52a is closed, the third valve 52c is opened, and the cold water is guided to the low-temperature tank 11c. On the other hand, when the temperature of the ring water measured by the sensor 60 is not cooled down to a low temperature T ₂ ° C. sufficient to cool the load 13, for example, when the temperature is about 11 to 15 ° C. The first valve 52a is opened, the third valve 52c is closed, and water is led to the high-temperature tank 11a. The water is pumped up by the pump 43, turned into cooling water by the independent refrigerator 15, and finally led to the low-temperature tank 11c. If the temperature of the outside air is about 4 ° C. or less,
Similarly to the above-described conventional example, the ring water cooled by the outside air in the heat exchanger 12 can be cooled to about 5 to 8 ° C., and thus is guided to the low-temperature tank 11c.

As described above, according to the cooling device 1 of the present invention, not only when the outside air temperature is as low as about 4 ° C. or less, which is the outside air temperature at which a conventional heat exchanger can be used, but also when the outside air temperature is 10 ° C.
Even in the case of a relatively high temperature of about −12 ° C. or less, it is possible to effectively use the heat exchanger 12 of the chilled water production device using the difference between the temperature of the outside air and the temperature of the water ring.

Here, as an example, from October in Sendai district,
In the period up to the month, the cooling device 1 of the present invention shown in FIG.
(Table 1) shows the time during which the cooling water can be produced using the outside air in the conventional cooling device 100 shown in FIG. In this case, the cooling device 1 of the present invention operates the heat exchanger 12 when the temperature of the outside air is 10 ° C. or less, and the conventional cooling device 100 has the temperature of the outside air of 4 ° C. or less. Sometimes, it was measured that the heat exchanger 102 was operated.

[0036]

[Table 1]

As is clear from Table 1, when the cooling device 1 of the present invention is used, the temperature of the outside air is not limited to a low temperature of, for example, about 4 ° C. or less, but is relatively high, for example, If the outside air temperature is about 12 ° C. or less, preferably about 10 ° C. or less, the heat exchanger 12 can be operated and used, so that the outside air is sufficiently used in the period from October to April. Thus, the production of the cooling water can be performed. Thereby, the operation efficiency of the heat exchanger can be improved, and the operation cost of the cooling device can be reduced. In addition, since an inexpensive heat exchanger can be frequently used, the manufacturing cost of the cooling device can be reduced.

In the above case, when the temperature of the water after cooling the load 13 is 16 to 18 ° C., the heat exchanger 12 is set to a temperature T ₁ ° C. of the outside air of 13 ° C. or less, Although an example has been described in which the present invention is preferably used when the temperature is preferably 10 ° C. or less, that is, a temperature equal to or less than a temperature selected in the range of 10 to 13 ° C., the present invention is not limited to this example. When the temperature of the water after cooling is higher than the above example, the set temperature T ₁ ° C of the outside air is set to a higher temperature than the above example, and the cooling water is Can be manufactured.

In the cooling apparatus according to the embodiment of the present invention shown in FIG. 1, a case where a cooling apparatus in which one refrigerator 14, an independent refrigerator 15, and one heat exchanger 12 are installed is applied. The cooling device of the present invention is not limited to the above-described example, and has a configuration in which a plurality of these devices are installed according to the amount of water ring, the operation efficiency of each device, the temperature of the outside air, and other circumstances. You can also.

[0040]

According to the cooling device of the present invention, a heat exchanger for cooling water by utilizing the difference between the temperature of the outside air and the temperature of the circulating water is provided. Not only when the temperature is low, but also when the temperature is relatively high, for example, when the outside air temperature is 10
Below the temperature selected in the range of ~ 13 ° C, preferably 10 ° C
When the temperature is about １２12 ° C. or less, it can be operated and used for producing cooling water, and the operation efficiency of the heat exchanger can be improved. As a result, the operation time of the refrigerator operating alternatively to the heat exchanger can be reduced, and the operation cost of the cooling device can be reduced. In addition, since the inexpensive heat exchanger can be frequently used in the cooling device, the manufacturing cost of the cooling device can be reduced.

[Brief description of the drawings]

FIG. 1 shows a schematic diagram of an example of an outside air cooling device of the present invention.

FIG. 2 shows a schematic view of an example of a conventional outside air cooling device.

[Explanation of symbols]

1,100 cooling device, 11,101 heat storage tank, 11
a, 101a high temperature bath, 11b, 101b medium temperature bath, 1
1c, 101c Low temperature bath, 12, 102 heat exchanger, 1
3,103 load, 14,104 refrigerator, 15,10
5 Independent refrigerator, 16, 106 Heat release device (cooling tower) 16a, 106a Fan, 16p, 10
6p precipitation pipe, 17,107 heat release device (cooling tower), 51 first control valve, 51a first valve, 51b second valve, 51c third valve,
52 second control valve, 52a first valve, 52b
Second valve, 52c Third valve, 60 sensors, 70, 110 weir, 201 cold water supply pipe, 202 delivery pipe, 301, 302, 303, 304, 305, 30
6,307,308 Valve 400,401,40
2,403 pump

Claims (2)

[Claims] 1. A cooling device having a heat storage tank and a heat exchanger of a cooling water producing device, wherein the heat storage tank has at least a high temperature tank and a low temperature tank, and is cooled by cold water from the low temperature tank. When the outside air temperature is equal to or lower than T ₁ ° C, the water cooled the load of the object to be subjected to the heat exchanger, when the outside air temperature is higher than T ₁ ° C,
A first control valve having a function of sending the water to the high-temperature tank, a sensor for detecting the temperature of the water cooled by the heat exchanger, and when the water temperature detected by the sensor is T ₂ ° C or lower, A cooling device, comprising: a second control valve having a function of selecting and sending the low temperature tank to the high temperature tank when the temperature is higher than T ₂ ° C. 2. The method according to claim 1, wherein the outside air temperature T ₁ is a temperature selected in a range of 10 to 13 ° C., and the water temperature T ₂ is a temperature selected in a range of 5 to 8 ° C. The cooling device according to claim 1.