JPH0814607A - Chilled water circulating method and system for cooler - Google Patents

Abstract

PURPOSE:To simply and suitably regulate the circulating quantity of chilled water from a chilled water tank by controlling the flow rate of the water of a bypass line based on the chilled water temperature of the inlet side of a load side heat exchanger. CONSTITUTION:A chilled water tank 1 is connected to a load side heat exchanger 4 via a chilled water supply line 7 and a chilled water reflux line 8 to form a chilled water circulating line 9. A bypass line 11 for connecting the line 7 to the line 8 is inserted to the line 9. The part of the chilled water is bypassed to be circulated from the line 8 to the line 11. The flow rate of the water of the line 11 is controlled based on the chilled water temperature of the inlet side 5 of the exchanger 4. Thus, the circulated quantity of the water from the tank 1 can be simply and suitably regulated, and supercooling, insufficient cooling of a material to be treated of the load side can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device of the type for circulating cold water, and more particularly to a cooling water circulation method and a cooling water circulation system in this type of cooling device.

[0002]

2. Description of the Related Art Conventionally, in a cooling device for a food pack product, a cooling device used in a liquefaction process, etc., separately generated cold water is circulated through a heat exchanger provided in the cooling device, a so-called load side heat exchanger. I am letting you. That is, the separately generated cold water is simply circulated to the load side heat exchanger.

[0003]

However, in the chilled water circulation in the conventional cooling device, regarding the required level of the cooling temperature on the load side, the required level such as the level change during operation and the system switching in a plurality of cooling systems is required. If there is a change in, it is not possible to respond accurately, and it was necessary to always prepare a large amount of cold water at a predetermined temperature. Therefore, there are problems such as overcooling and undercooling on the load side. On the other hand, on the other side of the cold water generating side, there is a problem that the energy loss for always ensuring the cold water at the predetermined temperature is large and the equipment for preparing a large amount of the cold water at the predetermined temperature becomes large.

Further, in order to meet the various required levels, it is necessary to reset the set values such as the cold water temperature on the cold water producing side each time, which is very inconvenient.
It was poor in versatility.

[0005]

The present invention has been made to solve the above-mentioned problems. First, the cold water circulation method of the present invention is of a type in which cold water in a cold water tank is circulated to a load side heat exchanger. A method of circulating cold water in a cooling device,
The outlet side of the cold water tank and the inlet side of the load side heat exchanger are connected by a cold water supply line, and the inlet side of the cold water tank and the outlet side of the load side heat exchanger are connected by a cold water return line. A cold water circulation line is formed, a bypass line connecting the cold water supply line and the cold water return line is inserted into the cold water circulation line, and a part of the cold water is bypass-circulated from the cold water reflux line to the bypass line. And, the cold water flow rate of the bypass line is controlled based on the cold water temperature at the inlet side of the load side heat exchanger, and the cold water circulation system of the present invention uses the cold water in the cold water tank as the load side heat. In a cooling device of a type that circulates to the exchanger, the outlet side of the cold water tank and the inlet side of the load side heat exchanger are connected by a cold water supply line, and A bypass line that connects the inlet side of the tank and the outlet side of the load side heat exchanger with a cold water circulation line to form a cold water circulation line, and connects the cold water supply line and the cold water circulation line to the cold water circulation line. Is provided, a flow rate control valve that controls the flow rate of cold water in the bypass line is provided, and a temperature detector that controls the flow rate control valve is provided on the inlet side of the load side heat exchanger.

[0006]

According to the present invention, the cold water temperature at the inlet side of the load side heat exchanger is detected, and the flow rate of cold water flowing through the bypass line is adjusted based on the detected value. That is, if the cold water temperature at the inlet side of the load side heat exchanger is equal to or lower than the set value with respect to the required level of the cooling temperature at the load side, the flow rate of cold water circulating from the cold water return line through the bypass line is large, Circulation of cold water from the tank is reduced.
And, the cold water temperature at the inlet side of the load side heat exchanger is
When the value is equal to or more than the set value, the flow rate of cold water circulating in the bypass line is small and the circulation amount of cold water from the cold water tank is large.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, a cold water tank 1 equipped with an appropriate cooling means (not shown) stores a predetermined amount of cold water cooled to a predetermined temperature, for example, 0 ° C. The cold water contained is
It is configured to circulate to the heat exchanger provided in the cooling device for the edible pack product or the cooling device used in the liquefaction process, that is, the load side heat exchanger 4.

The cold water tank 1 and the load side heat exchanger 4
The circulation route of cold water in and is configured as follows. That is, the outlet side 2 of the cold water tank 1 and the inlet side 5 of the load side heat exchanger 4 are connected via a cold water supply line 7, and the inlet side 3 of the cold water tank 1 and the load side heat are connected. The outlet side 6 of the exchanger 4 is a cold water return line 8
Connected through. As a result, the cold water supply line 7
The cold water recirculation line 8 constitutes a cold water circulation line 9 that connects the cold water tank 1 and the load side heat exchanger 4 to each other. Therefore, the cold water in the cold water tank 1 circulates between the cold water tank 1 and the load side heat exchanger 4 by the circulation pump 10 provided in the cold water supply line 7, and the load side heat exchanger 4 The object to be processed (not shown) is cooled to a predetermined temperature via.

In the present invention, a bypass line 11 that bypasses the cold water circulation line 9 is provided. The bypass line 11 is provided in a state where the cold water supply line 7 and the cold water return line 8 are connected. As a result, a part of the cold water flowing through the cold water return line 8 does not flow back to the cold water tank 1, but is circulated to the load side heat exchanger 4 through the bypass line 11. The bypass line 11 is provided with a flow rate adjusting valve 12 for adjusting the flow rate of the cold water branched from the cold water return line 8.
The flow rate control valve 12 adjusts its opening degree so that the load side heat exchanger 4 passes through the bypass line 11.
When the opening is large, the flow rate of the cold water circulating through the bypass line 11 is large, so that the circulation amount of the cold water from the cold water tank 1 is small and the opening degree of the cold water is small. When the degree is low, the flow rate of cold water circulating through the bypass line 11 is small, and therefore the circulation amount of cold water from the cold water tank 1 is large.

In order to circulate the cold water flowing through the bypass line 11, the circulation pump 10 connects the cold water supply line 7 and the bypass line 11 with each other and the load side heat exchange as shown in the figure. It is preferable to provide the cold water supply line 7 between the inlet side 5 of the vessel 4.

Further, in the present invention, a temperature detector 13 for controlling the opening degree of the flow rate control valve 12 is provided. The temperature detector 13 is provided in the cold water supply line 7 at a position close to the inlet side 5 of the load side heat exchanger 4. The temperature detector 13 detects the cold water temperature on the inlet side 5 of the load side heat exchanger 4 and outputs the detected value to the controller 15 via the communication line 14.
The controller 15 is configured to output a signal for adjusting the opening degree of the flow rate control valve 12, and presets a temperature set value for the required level of the cold water temperature in the load side heat exchanger 4. This set value and temperature detector 13
If the detected value is equal to or less than a set value, a signal for maintaining or increasing the opening degree of the flow rate control valve 12 is output to the flow rate control valve 12 and detected. If the value is equal to or larger than the set value, a signal for reducing the opening is output to the flow rate control valve 12. As a result, if the detected value of the temperature detector 13 is equal to or more than the set value, the circulation amount of cold water from the cold water tank 1 is small, and conversely, if the detected value is equal to or less than the set value, the cold water from the cold water tank 1 is obtained. The circulation amount of is increased. That is, in the present invention, the flow rate of cold water flowing through the bypass line 11 is controlled based on the detection value of the temperature detector 13.

As described above, according to the present invention, the temperature detection is performed for the fluctuation of the required level of the cold water temperature in the load side heat exchanger 4 during operation and also for the various required levels. This can be dealt with by adjusting the opening degree of the flow rate control valve 12 based on the detection value of the device 13. As a result, the amount of cold water used in the cold water tank 1 can be greatly saved, so that the cold water tank 1 can be downsized and the cold water production cost can be reduced.

While one embodiment of the present invention has been described in detail with reference to FIG. 1, an embodiment in which the present invention is applied to a more specific cooling device will be described in detail with reference to FIG. To do. FIG. 2 illustrates an ice storage type cooling device using a supercooled water type ice making device as a specific example of the cooling device of the present invention.

In the embodiment shown in FIG. 2, the cold water tank 1 described with reference to FIG. 1 comprises an ice storage tank 20 for storing ice made by supercooled water. Similar to the embodiment shown in FIG. 1, the ice storage tank 20 is connected to the load side heat exchanger 4 via the cold water supply line 7 and the cold water recirculation line 8 to cool the load side heat exchanger 4. Circulation line 9
Is equipped with a bypass line 11.

In the embodiment shown in FIG. 2, the circulation pump 10 having the same function as described in FIG.
A flow rate control valve 12, a temperature detector 13, and a controller 15 are provided.

The ice storage tank 20 shown in FIG. 2 is equipped with a refrigerator 21 for making ice with supercooled water and a heat exchanger 22 for supercooled water. By operating these, the ice storage tank 20 is shown. Ice is stored inside. Further, since the cold water that flows back from the cold water return line 8 to the ice storage tank 20 is used as the defrosting water in the ice storage tank 20, the cold water recirculation line 8 is used in the defrosting water nozzle 23 provided in the ice storage tank 20. It is connected to the. Further, the ice storage tank 20 is provided with a water level sensor 24 for detecting the water level in the tank.

A water storage tank 25 for supplying ice making water to the supercooling water heat exchanger 22 or for collecting cold water in the ice storage tank 20 is arranged in the ice storage tank 20 in a close state. Has been done. The water storage tank 25 is connected to the supercooling water heat exchanger 22 via an ice making water supply line 26, and the first pump 2 provided in the ice making water supply line 26.
7, the water in the water storage tank 25 is supplied to the supercooling water heat exchanger 22 as ice making water. Further, a recovery line 28 branched from the cold water supply line 7 is connected to the water storage tank 25, and at the time of completion of cooling or the like, a second pump 29 provided in the recovery line 28 causes the inside of the ice storage tank 20. Collect cold water from. And the water tank 2
5, a cold water storage line 30 branched from the cold water return line 8 is connected, and when cold water is flowing back through the cold water return line 8, by a constant flow valve 31 provided in the cold water storage line 30, A predetermined amount of reflux water is stored in the water storage tank 25. Further, a tap water supply line 32 is connected to the water storage tank 25.

As described above, according to the embodiment shown in FIG. 2, the cold water in the ice storage tank 20 circulates through the load side heat exchanger 4 by the same operation as in the embodiment of FIG. Therefore, as in the case of the embodiment of FIG. 1, the amount of ice storage in the ice storage tank 20 can be greatly reduced. In an experiment conducted by the inventors, it was confirmed that the required ice amount was reduced by about 25% to 45% as compared with the conventional case according to this example. As a result, the ice storage tank 20 can be made compact and the ice making cost can be reduced. This is particularly effective when using a supercooled water type ice making device that uses nighttime electricity. It will play.

[0019]

As described above, according to the present invention, the chilled water temperature at the inlet side of the load side heat exchanger is detected, and the chilled water flow rate flowing through the bypass line is adjusted based on the detected value. The circulation amount of cold water from the tank can be adjusted easily and appropriately. As a result, on the load side, it is possible to eliminate overcooling or undercooling of the object to be processed, and on the cold water generation side, it is sufficient to generate cold water corresponding to the required level of cooling temperature on the load side, thus saving energy. This can be realized, and the equipment can be made compact. In addition, it is possible to quickly respond to changes or changes in various required levels on the load side, which is versatile. Furthermore, it can be realized with a simple configuration, and maintenance and management are very easy.
This type of cooling device is extremely effective.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram when applied to an ice storage type cooling device by a supercooled water type ice making device as another embodiment of the present invention.

[Explanation of symbols]

 1 Chilled water tank 2 Chilled water tank outlet side 3 Chilled water tank inlet side 4 Load side heat exchanger 5 Load side heat exchanger inlet side 6 Load side heat exchanger outlet side 7 Chilled water supply line 8 Chilled water circulation line 9 Chilled water circulation Line 10 Circulation pump 11 Bypass line 12 Flow control valve 13 Temperature detector 14 Signal line 15 Controller 20 Ice storage tank 21 Refrigerator 22 Supercooling water heat exchanger 25 Water storage tank 26 Ice water supply line 28 Recovery line 30 Cold water storage line

Claims (3)

[Claims] 1. A method of circulating cold water in a cooling device of the type in which cold water in a cold water tank 1 is circulated to a load side heat exchanger 4, comprising: an outlet side 2 of the cold water tank 1 and a load side heat exchanger 4. The inlet side 5 is connected by a cold water supply line 7, and the inlet side 3 of the cold water tank 1 and the outlet side 6 of the load side heat exchanger 4 are connected by a cold water return line 8 to form a cold water circulation line 9. Then, a bypass line 11 that connects the cold water supply line 7 and the cold water return line 8 is inserted into the cold water circulation line 9, and a part of the cold water from the cold water return line 8 is bypass-circulated to the bypass line 11. The flow rate of cold water in the bypass line 11 is controlled on the basis of the cold water temperature at the inlet side 5 of the load side heat exchanger 4 in the cooling device. 2. In a cooling device of the type in which the cold water in the cold water tank 1 is circulated to the load side heat exchanger 4, the cold water is fed to the outlet side 2 of the cold water tank 1 and the inlet side 5 of the load side heat exchanger 4. While being connected by a supply line 7, an inlet side 3 of the cold water tank 1 and an outlet side 6 of the load side heat exchanger 4 are connected by a cold water return line 8 to form a cold water circulation line 9,
A bypass line 11 connecting the cold water supply line 7 and the cold water return line 8 is provided in the cold water circulation line 9,
A flow rate control valve 12 for controlling the flow rate of cold water in the bypass line 11 is provided, and a temperature detector 1 for controlling the flow rate control valve 12 is provided.
3. A chilled water circulation system in a cooling device, wherein 3 is provided on an inlet side 5 of the load side heat exchanger 4. 3. The chilled water circulation system in a cooling device according to claim 2, wherein the flow rate control valve 12 is provided in the bypass line 11.