JPH05106877A - Heat storage device and operating method thereof - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to provide a heat storage device that enables heat radiation operation while heat storage operation is performed, makes it possible to take out heat storage effectively, and reduces equipment costs. It is to provide the driving method. [Structure] The refrigerator 1 and the ice making heat exchangers 4 and 5 are connected, the ice making heat exchangers 4 and 5 are installed in the heat storage tanks 2 and 3, and the heat storage tanks 2 and 3 are switched valves 9, 10, 11 ,. Connected to the load side via 12. The switching valves 9 and 10 are opened, the switching valves 11 and 12 are closed, and the refrigerator 1, the heat medium pump 6, the hot and cold water pump 15,
Operate the fan coil unit 16 to dissipate heat in the heat storage tank 2,
The heat storage operation is performed in the heat storage tank 3. When the heat storage tank 3 has completed heat storage, the switching valves 9 and 10 are closed and the switching valve 11 is opened to perform heat storage in the heat storage tank 2 and heat radiation operation in the heat storage tank 3. ..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device and a method of operating the same, and more particularly to a heat storage system which is suitable for a system that requires heat radiation operation during heat storage operation and is capable of simultaneous heat storage and heat radiation operation.

[0002]

2. Description of the Related Art In a conventional device, during heat storage operation,
The heat medium from the refrigerator is supplied only to the ice making heat exchanger in the heat storage tank. Further, since the sluice valve of the hot and cold water pipe connected to the heat storage tank is closed to shut off from the load side, the heat storage and heat radiation simultaneous operation cannot be performed. It should be noted that, as ones related to this kind, for example, Japanese Patent Laid-Open No. 1-24422
The one described in Japanese Patent No. 88 is cited.

[0003]

In the above-mentioned prior art, even if a cooling or heating load is present during the heat storage operation, the refrigerator only stores heat and cannot air-condition. Also,
When a cooling or heating load is present during the heat storage operation, it is necessary to install another refrigerator and cover the load with this refrigerator. Furthermore, when the heat dissipation operation is completed, the heat storage operation is performed with the ice remaining in one part in the heat storage tank, so that a large amount of ice is attached only to one part of the ice making heat exchanger,
There was a risk that the heat transfer from ice and water during the heat dissipation operation would be deteriorated and that the heat storage could not be effectively taken out.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a heat storage device and a method for operating the heat storage device that can perform heat radiation operation while performing heat storage operation. It is intended. Also,
Another object of the present invention is to provide a heat storage device and a method for operating the heat storage device that make it possible to effectively take out heat storage and reduce facility costs.

[0005]

In order to achieve the above object, the most basic constitution of the first invention of the heat storage device according to the present invention is at least a heat source device, a heat storage tank, and a heat medium for them. In a heat storage device having a piping system for circulating
The heat storage tank is divided into a plurality of parts, and each heat storage tank is provided with a cold / hot water pipe system connected to the load side and a switching valve thereof.

Specifically, the structure of the second invention relating to the heat storage device of the present invention is such that at least a refrigerator, a heat storage tank, an ice making heat exchanger in the heat storage tank, and a heat medium are circulated through these. In a heat storage device having a piping system for, a plurality of heat storage tanks having an ice making heat exchanger are provided, and for each heat storage tank,
The heat medium piping system connected to the refrigerator, the cold / hot water piping system connected to the load side, and the cold / hot water piping are provided for each of the plurality of heat storage tanks to perform heat radiation operation and the other heat storage tank to perform heat storage operation. Thus, a switching valve for switching the piping system is provided.

Further, the structure of the third invention relating to the heat storage device of the present invention is a heat storage device comprising at least a refrigerator, a water heat storage tank, and a piping system for circulating a heat medium in these, A plurality of water storage tanks, each of which is equipped with a heat medium piping system connected to the refrigerator, a cold / hot water piping system connected to the load side, and each cold / hot water piping And a switching valve for switching the piping system so that one of the water heat-dissipating tanks and the other water heat storage tank are heat-storing.

Further, the structure of the fourth invention relating to the heat storage device of the present invention is a heat storage device comprising at least a heat pump, a water heat storage tank, and a piping system for circulating a heat medium in these, And a heat medium piping system connected to a heat pump for each water heat storage tank,
A cold / hot water pipe system connected to the load side, and a switching valve provided in each cold / hot water pipe to switch the pipe system so that one of the plurality of water heat storage tanks performs heat radiation operation and the other water heat storage tank performs heat storage operation. Is provided.

In order to achieve the above object, the method of operating the heat storage device according to the present invention is configured such that at least a heat source device, a heat storage tank, and a pipe system for circulating a heat medium therethrough are provided. In the device, a plurality of heat storage tanks are provided, each of the heat storage tanks is provided with a cold / hot water pipe system connected to the load side and a switching valve thereof, and at least one of the plurality of heat storage tanks has a large heat storage capacity. While opening the switching valve of the hot and cold water pipes connected to and radiating heat to the load side, closing the switching valve of the hot and cold water pipes connected to other heat storage tanks of the plurality of heat storage tanks, The heat medium is circulated from the heat source device to continue the heat storage, and the heat storage tank after the heat radiation and the heat storage tank after the heat storage is completed are sequentially switched to perform the heat storage / heat radiation simultaneous operation.

[0010]

The function of each of the above technical means is as follows. Above, particularly during the cooling operation of the second invention,
During simultaneous heat storage and heat dissipation operation, cool the heat medium with a refrigerator,
This heat medium is sent to each ice making heat exchanger. On the other hand, the switching valve of the cold / hot water pipe leading to the load side of a certain heat storage tank is closed, and the heat storage operation is performed in this heat storage tank. Further, in other heat storage tanks, the switching valve of the hot / cold water pipe leading to the load side is opened, and the heat radiation operation is performed in this heat storage tank. At this time, the heat radiation operation is preferentially performed from the heat storage tank in which the heat is stored at the end of the overall heat radiation operation in which only the heat radiation operation is performed in all the heat storage tanks.

With the passage of time, the heat storage tank during the heat storage operation completes the heat storage. From this point, the cold / hot water switching valve of the heat storage tank during the heat storage operation is opened to switch to the heat radiation operation, and the cold / hot water switching valve of the other heat storage tank during the heat radiation operation is closed to switch to the heat storage operation. In this way, the heat storage tanks that perform the heat storage operation are sequentially switched, and the heat storage of all the heat storage tanks is completed by the start time of the overall heat radiation operation. This enables simultaneous operation of heat storage and heat dissipation, as well as heat storage,
The ice can be used up.

Further, in the heating operation of the second aspect of the invention, in the simultaneous heat storage / heat radiation operation, the heat medium is heated by the refrigerator, and the heat medium is sent to the respective ice making heat exchangers. On the other hand, the switching valve of the cold / hot water pipe leading to the load of a certain heat storage tank is closed, and the heat storage operation is performed in this heat storage tank. In the other heat storage tanks, the switching valve of the hot and cold water pipe is opened, and the heat radiation operation is performed in this heat storage tank. At this time, the heat radiation operation is preferentially performed from the heat storage tank in which the heat is stored at the end of the entire heat radiation operation in which only the heat radiation operation is performed in all the heat storage tanks.

With the passage of time, the heat storage tank during the heat storage operation completes the heat storage. From this point, the cold / hot water switching valve of the heat storage tank during the heat storage operation is opened to switch to the heat radiation operation, and the cold / hot water switching valve of the other heat storage tank during the heat radiation operation is closed to switch to the heat storage operation. In this way, the heat storage tanks that perform the heat storage operation are sequentially switched, and the heat storage of all the heat storage tanks is completed by the start time of the overall heat radiation operation. This enables simultaneous operation of heat storage and heat dissipation, and also allows the heat storage to be used up.

Next, in the cooling operation of the third aspect of the present invention, in the simultaneous heat storage / heat radiation operation, the water in the heat storage tank is cooled by the refrigerator, and the water is sent to each water heat storage tank. On the other hand, the switching valve of the cold / hot water pipe leading to the load of a certain water heat storage tank is closed, and the heat storage operation is performed in this water heat storage tank. Further, in other water heat storage tanks, the switching valve of the cold / hot water pipe leading to the load is opened, and the heat radiation operation is performed in this water heat storage tank. At this time, the heat radiation operation is carried out preferentially from the water heat storage tank in which the heat is stored at the end of the entire heat radiation operation in which only the heat radiation operation is performed in all the water heat storage tanks.

With the passage of time, heat storage in the water heat storage tank during heat storage operation is completed. From this point, the cold / hot water switching valve of the water heat storage tank during heat storage operation is opened to switch to heat radiation operation, and the cold / hot water switching valve of the other water heat storage tank that was in heat radiation operation is closed to switch to heat storage operation. .. In this way, the water heat storage tanks that perform the heat storage operation are sequentially switched, and the heat storage of all the water heat storage tanks is completed by the start time of the overall heat radiation operation. This enables simultaneous operation of heat storage and heat dissipation, and also allows the heat storage to be used up.

In the heating operation of the fourth aspect of the present invention, in the simultaneous heat storage / heat radiation operation, the heat pump heats the water in the water heat storage tank and sends the water to the respective water heat storage tanks. On the other hand, the switching valve of the cold / hot water pipe leading to the load of a certain water heat storage tank is closed, and the heat storage operation is performed in this water heat storage tank. Further, in other water heat storage tanks, the switching valve of the cold / hot water pipe leading to the load is opened, and the heat radiation operation is performed in this water heat storage tank. At this time, the heat radiation operation is carried out preferentially from the water heat storage tank in which the heat is stored at the end of the entire heat radiation operation in which only the heat radiation operation is performed in all the water heat storage tanks.

With the lapse of time, the heat storage operation of the water heat storage tank is completed. From this point, the cold / hot water switching valve of the water heat storage tank during heat storage operation is opened to switch to heat radiation operation, and the cold / hot water switch valve of the other water heat storage tank that was in heat radiation operation is closed to switch to heat storage operation. .. In this way, the water heat storage tanks that perform the heat storage operation are sequentially switched, and the heat storage of all the water heat storage tanks is completed by the start time of the overall heat radiation operation. As a result, the heat storage and heat dissipation can be simultaneously operated, and the heat storage can be used up.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. [Embodiment 1] FIG. 1 is a system diagram of an apparatus in which a heat storage tank according to an embodiment of the present invention is divided into two. The device shown in FIG.
The refrigerator 1 and the ice-making heat exchanger 4 and the ice-making heat exchanger 5 divided into two parts are connected by a heat medium feed pipe 7 and a heat medium return pipe 8, and a heat medium pump 6 is provided in the middle of the heat medium feed pipe 7.
Is provided, and the inside of the heat medium circulation system of the refrigerator 1, the heat medium feed pipe 7, the heat medium return pipe 8, the heat medium pump 6, the ice making heat exchanger 4, and the ice making heat exchanger 5 has heat such as antifreeze liquid. Filled with medium (eg brine). Ice making heat exchanger 4
Is installed in the heat storage tank 2, and the ice making heat exchanger 5 is installed in the heat storage tank 3.

The heat storage tank 2 is connected to the load fan coil unit 16 via the switching valve 9, the switching valve 10, the cold / hot water feed pipe 13, and the cold / hot water return pipe 14, and the heat storage tank 3 is switched to the switching valve 1.
1, a switching valve 12, a hot / cold water feed pipe 13, and a cold / hot water return pipe 14 are connected to a load fan coil unit 16, and a cold / hot water pump 15 is provided in the midway of the cold / hot water feed pipe 13.
Has been installed. In the heat storage tank 2 and the heat storage tank 3, the ice making heat exchanger 4 and the ice making heat exchanger 5 are stored so as to be submerged. In addition, the hot and cold water supply pipe 13, the hot and cold water return pipe 14,
The cold / hot water circulation system of the cold / hot water pump 15 and the load fan coil unit 16 is filled with water. A water level sensor 17 is attached to the heat storage tank 2, and a water level sensor 18 is attached to the heat storage tank 3. The control panel 19 for controlling each device and each device are electrically connected as shown by a broken line in FIG. There is.

The cooling operation mode in the air conditioning system equipped with such a heat storage device will be described. First, the case where only the heat storage operation is performed will be described. The switching valves 9, 10, 11, 12 of the hot and cold water piping system are closed to shut off the load side and the heat storage tanks 2, 3. The refrigerator 1 cools the heat medium to a temperature below zero, and the heat medium pump 6 sends it to the ice making heat exchangers 4, 5. The heat medium from which the heat of water is taken by the ice making heat exchangers 4 and 5 rises in temperature and returns to the inside of the refrigerator 1 to be cooled. By circulating the heat medium in this way, the heat storage tanks 2, 3
The water temperature inside gradually decreases and eventually reaches the outer surfaces of the ice making heat exchangers 4 and 5. Since the specific volume of ice is larger than the specific volume of water, the water level in the heat storage tanks 2 and 3 rises when ice is generated. This water level is detected by water level sensors 17 and 18. Water level information from the water level sensors 17 and 18 is control panel 1
9 is sent. When the detected water level reaches the water level preset in the control panel 19, it is determined that the ice has reached a predetermined amount, and the refrigerator 1 and the heat medium pump 6 are stopped to end the heat storage operation.

A case where only the entire heat radiation operation is performed will be described. The switching valves 9, 10, 11, 12 of the hot and cold water piping system are opened, and the hot and cold water pump 15 and the load fan coil unit 16 are operated to circulate water. The water that has taken the heat of the outside air by the load fan coil unit 16 rises in temperature and returns to the heat storage tanks 2 and 3 through the cold / hot water return pipe 14. Water is the heat of melting of ice on the surface of the ice making heat exchangers 4, 5 and the heat storage tanks 2, 3
The heat is taken away by the sensible heat of the water inside, the temperature drops, and the fan coil unit for load 1 passes through the cold / hot water feed pipe 13.
It flows into 6. As the ice in the heat storage tanks 2 and 3 decreases, the water level decreases as opposed to the heat storage operation. This water level is detected by water level sensors 17 and 18. Water level sensor 1
Water level information is transmitted from 7 and 18 to the control panel 19. When the detected water level drops to a water level preset in the control panel 19, it is determined that the ice is gone. In this way, the ice in the heat storage tanks 2 and 3 is eliminated, and the heat radiation operation is performed using the cold heat in the heat storage tanks until the water temperature rises to a predetermined temperature.

Next, the case of performing the heat storage / heat radiation simultaneous operation will be described. Of the heat storage tanks 2 or 3, the heat storage tank with the larger amount of ice remaining performs the heat radiation operation. Here, the one with a large amount of ice left is assumed to be the heat storage tank 2. Switching valve 9, 10
Is opened to operate the cold / hot water pump 15 and the load fan coil unit 16. The switching valves 11 and 12 of the heat storage tank 3 are closed to shut off the cold / hot water return pipe 14 and the cold / hot water feed pipe 13. On the other hand, the refrigerator 1 and the heat medium pump 6 are operated. Thus, the heat storage operation is performed on the heat storage tank 3 side to generate ice, and on the heat storage tank 2 side, the heat on the load side is taken through the load fan coil unit 16 and water to perform cooling. In this way, the heat storage operation is performed on the heat storage tank 2 side and the heat storage operation is performed on the heat storage tank 3 side.

While this operation is continued, the amount of ice in the heat storage tank 3 reaches a predetermined amount, and the water level sensor 18 detects that the water has reached the specified water level, and only the heat storage tank 3 completes the heat storage. From this point, the switching valves 9 and 10 are closed, and the switching valve 1
1 and 12 are opened, the heat storage tank 2 side is in the heat storage operation, and the heat storage tank 3
Switch the side to heat dissipation operation. Ice-making heat exchanger 5 of heat storage tank 3
Since the heat medium cooled by the refrigerator 1 passes through the inside of the refrigerator, the heat is radiated, but the heat of the load is taken by the heat medium, the ice does not melt, and the water temperature does not rise. In the other heat storage tank 2, the load side is shut off and the ice making heat exchanger 4
Since the cooled heat medium passes through the inside, the water temperature drops and slush ice is produced. While this operation is continued, the amount of ice in the heat storage tank 2 reaches a predetermined amount, and the water level sensor 17 detects that the water has reached the specified water level, and the heat storage tank 2 also completes the heat storage. In this way, it is possible to satisfy the predetermined amount of heat storage while performing the heat radiation operation.

The cooling operation has been described above, but the heating operation will be described below. Contrary to the cooling operation, the heating operation heats the heat medium by the refrigerator 1, raises the water temperature in the heat storage tank to a predetermined temperature to store heat, and utilizes the sensible heat of this water to heat the load side. Cover Similar to the cooling operation, the heat storage / heat radiation simultaneous operation at this time performs heat radiation operation in one heat storage tank and heat storage operation in the other heat storage tank.When the heat storage is completed, the switching valve is switched to perform heat radiation operation. The existing heat storage tank is set to heat storage operation, and the heat storage tank that was performing heat storage operation is set to heat radiation operation. In this way, the heat storage / heat radiation simultaneous operation is performed.

According to the present embodiment, the simultaneous operation of heat storage and heat radiation has a great effect on the exhaustion of ice in the heat storage tank, which makes it possible to generate uniform ice on the surface of the ice making heat exchanger. Becomes If uniform ice is generated, the contact area between water and ice will increase, and the heat transfer performance of water and ice will increase,
The ability to take out heat storage is greatly improved. Further, since heat radiation operation can be performed during heat storage operation, when one heat source device is installed, there is no limitation condition of application destination such as the prior art in which heat radiation operation is not performed during heat storage operation, and the application destination of the heat storage system is eliminated. Can be expanded.

Further, when it is desired to perform cooling or heating during the heat storage operation, conventionally, in addition to the heat storage system, it was necessary to install a heat source device for cooling or heating, but according to the present invention, only the heat storage system is used. Since heat storage and heat radiation can be operated simultaneously, heat source equipment for cooling or heating during heat storage operation is not required, and the equipment cost such as main body cost, piping cost, power supply facility cost, equipment cost etc. is reduced. In addition to being able to do this, the equipment area can be reduced by this amount, saving space. further,
This maintenance is no longer required, and labor savings can be expected.

[Embodiment 2] FIG. 2 is a system diagram showing an apparatus in which a heat storage tank according to another embodiment of the present invention is divided into three parts.
In the apparatus shown in FIG. 2, the refrigerator 20 and the ice making heat exchanger 24,
The ice making heat exchanger 25 and the ice making heat exchanger 26 are connected by a heat medium feeding pipe 28 and a heat medium returning pipe 29, and a heat medium pump 27 is provided in the middle of the heat medium feeding pipe 28.
Refrigerator 20, heat medium feed pipe 28, heat medium return pipe 2
The heat medium circulation system of 9, the heat medium pump 27, the ice making heat exchanger 24, the ice making heat exchanger 25, and the ice making heat exchanger 26 is filled with a heat medium such as antifreeze (for example, brine). The ice making heat exchanger 24 is installed in the heat storage tank 21, the ice making heat exchanger 25 is installed in the heat storage tank 22, and the ice making heat exchanger 26 is installed in the heat storage tank 23.

The heat storage tank 21 is connected to the load fan coil unit 39 via the switching valves 30 and 31, the cold / hot water feed pipe 36, and the hot / cold water return pipe 37, and the heat storage tank 22 is switched to the switching valve 3.
2, 33, the cold / hot water feed pipe 36, and the cold / hot water return pipe 37 are connected to the load fan coil unit 39, and the heat storage tank 23 is connected to the switching valves 34, 35, the cold / hot water feed pipe 36, the cold / hot water return pipe 37. Is connected to the load fan coil unit 39 via. In the middle of the hot and cold water supply pipe 36,
A cold / hot water pump 38 is installed. Heat storage tanks 21, 22,
Ice-making heat exchangers 24, 25 and 26 are stored in the water 23 so as to be submerged. Water is filled in the cold / hot water circulating system of the cold / hot water feed pipe 36, the cold / hot water return pipe 37, the cold / hot water pump 38, and the load fan coil unit 39. A water level sensor 40 is attached to the heat storage tank 21, a water level sensor 41 is attached to the heat storage tank 22, and a water level sensor 42 is attached to the heat storage tank 23. The control panel 43 controls each device.
Are electrically connected to each other as indicated by a broken line.

The cooling operation mode of the air conditioning system equipped with such a heat storage device will be described below. First, the case where only the heat storage operation is performed will be described. The switching valves 30, 31, 32, 33, 34, 35 of the cold / hot water circulation system are closed to shut off the heat storage tank from the load side. The refrigerator 20 cools the heat medium to a temperature below zero, and the heat medium pump 27 sends it to the ice-making heat exchangers 24, 25, 26. Ice making heat exchanger 24,
The heat medium that has taken away the heat of water by 25 and 26 rises in temperature and returns to the inside of the refrigerator 20 to be cooled. By circulating the heat medium in this manner, the water temperature in the heat storage tanks 21, 22, 23 gradually decreases, and eventually the ice making heat exchangers 24, 25,
The outer surface of 26 is exposed to water. Since the specific volume of ice is larger than the specific volume of water, when ice forms, the heat storage tanks 21, 22, 23
The water level of the river rises. The water level sensor 40, 41,
42 to detect. Water level information is transmitted from the water level sensors 40, 41, 42 to the control panel 43. When the detected water level reaches the water level preset in the control panel 43, it is determined that the ice has reached a predetermined amount, and the refrigerator 20 and the heat medium pump 2
7 is stopped to end the heat storage operation.

Next, the case where only the whole heat radiation operation is performed will be described. Switching valves 30, 31, 32, 3 for cold / hot water circulation system
3, 34 and 35 are opened, the cold / hot water pump 38 and the load fan coil unit 39 are operated, and water is circulated.
The water, which has taken the heat of the outside air by the load fan coil unit 39, rises in temperature and passes through the cold / hot water return pipe 37 to return to the heat storage tanks 21, 22, 23. Water is ice making heat exchanger 24,2
Heat of melting ice on the surface of 5, 26 and heat storage tanks 21, 22,
Heat is taken away by the sensible heat of the water in 23, the temperature drops, and it flows into the load fan coil unit 39 through the cold / hot water feed pipe 36. As the ice in the heat storage tanks 21, 22, 23 decreases, the water level lowers, contrary to the heat storage operation. This water level is detected by water level sensors 40, 41, 42. Water level information is transmitted from the water level sensors 40, 41, 42 to the control panel 43. When the detected water level drops to the water level set by the control panel 43, it is determined that the ice has run out. In this way, the ice in the heat storage tanks 21, 22, 23 is eliminated, and the heat radiation operation is performed using the cold heat in the heat storage tanks until the water temperature rises to a predetermined temperature.

Next, the case of performing the heat storage / heat radiation simultaneous operation will be described. Of the heat storage tanks 21, 22, 23, the heat radiation operation is performed by the heat storage tank in which the largest amount of ice remains. Here, the heat storage tank in which the largest amount of ice remains is assumed to be the heat storage tank 21. The switching valves 30 and 31 are opened, and the hot and cold water pump 38,
The load fan coil unit 39 is operated. Heat storage tank 2
2 switching valves 32 and 33 are closed, and the switching valve 3 of the heat storage tank 23
By closing 4, 35, the hot and cold water return pipe 37 and the cold and hot water feed pipe 36 are disconnected. On the other hand, the refrigerator 20 and the heat medium pump 27 are operated. As a result, heat is stored in the heat storage tanks 22 and 23 to generate ice, and in the heat storage tank 21, heat is removed from the load side via the load fan coil unit 39 and water to perform cooling. In this way, the heat storage tank 21
The heat radiation operation is carried out at, and the heat storage operation is carried out at the heat storage tanks 22 and 23.

While continuing this operation, the heat storage tank 2
At the time when the water level sensors 41 and 42 detect that the amount of ice in the batteries 2 and 23 has decreased to a predetermined half, the switching valves 30 and 31 are closed and the switching valves 32 and 33 are opened to open the heat storage tank 21. , 2
3 is switched to heat storage operation, and the heat storage tank 22 is switched to heat dissipation operation.
Since the heat medium cooled by the refrigerator 20 passes through the ice making heat exchanger 25 of the heat storage tank 22, it is a heat radiation operation, but the heat for the load is taken by this heat medium and the ice melts. In addition, the water temperature does not rise. In the other heat storage tanks 21 and 23, the load side is shut off and the ice heat exchangers 24 and 26 are
Ice is produced because the cooled heat medium passes through. While continuing this operation, the water level sensor 41 detects that the amount of ice in the heat storage tank 21 has become half of a predetermined amount, and the water level sensor 41 indicates that the amount of ice in the heat storage tank 23 has reached a predetermined amount. Sensor 4
At the time of detection in 2, the switching valves 32 and 33 are closed and the switching valves 34 and 35 are opened to switch the heat storage tanks 21 and 22 to the heat storage operation and the heat storage tank 23 to the heat radiation operation.

At this point, the heat storage tank 23 has completed heat storage, and the heat storage tanks 21 and 22 have half the heat storage amount. Since the heat medium cooled by the refrigerator 20 passes through the ice making heat exchanger 26 of the heat storage tank 23, it is a heat radiation operation, but the heat of the load is taken by this heat medium and the ice does not melt. Also, the water temperature does not rise. In the other heat storage tanks 21 and 22, the load side is cut off, and the heat medium cooled by the refrigerator 20 passes through the ice making heat exchangers 24 and 25, so that ice is generated. While this operation is continued, the amount of ice in the heat storage tanks 21 and 22 reaches a predetermined amount, and the water level sensors 40 and 41 detect that the water has reached the specified water level, and the heat storage tanks 21 and 22 also complete the heat storage.
In this way, a predetermined heat storage amount is satisfied while performing the heat dissipation operation.

Although the cooling operation has been described above, the heating operation will be described below. Contrary to the cooling operation, the heating operation heats the heat medium by the refrigerator 20 to raise the temperature of the water in the heat storage tank to a predetermined temperature for heat storage, and the sensible heat of this water is used to heat the load side. To cover. Heat storage at this time
Similar to the cooling operation, the heat radiation simultaneous operation performs heat radiation operation in one heat storage tank, heat storage operation in the other heat storage tank, and when the heat storage is completed, switches the switching valve to switch the heat storage tank that was performing heat radiation operation. The heat storage operation is performed, and the heat storage tank that was performing the heat storage operation is changed to the heat radiation operation. Thus, the heat storage / heat radiation simultaneous operation is performed. According to this embodiment, the same effect as that of the embodiment of FIG. 1 can be obtained, and the use-up characteristic of ice in the heat storage tank is further improved as compared with the embodiment of FIG.

In the above embodiments, the heat storage tank is divided into two or three, but a plurality of heat storage tanks may be installed in advance to apply the present invention. Further, in each of the above-described embodiments, the example in which the heat storage tank has the ice making heat exchanger has been described, but the present invention can be applied to a mere water heat storage tank having no ice making heat exchanger, though not shown. Is. Furthermore, in each of the above-described embodiments, an example in which a refrigerator is used as a heat source device has been described, but the present invention is not limited to this, and although not shown, it can also be realized by using a water heat storage tank using a heat pump as a heat source device. It is a thing.

[0036]

As described in detail above, according to the present invention, it is possible to provide a heat storage device and a method of operating the same that can perform heat radiation operation while performing heat storage operation. Further, it is possible to provide a heat storage device and an operating method thereof that make it possible to effectively take out heat storage and reduce facility costs.

[Brief description of drawings]

FIG. 1 is a system diagram of an apparatus in which a heat storage tank according to an embodiment of the present invention is divided into two.

FIG. 2 is a system diagram showing an apparatus in which a heat storage tank according to another embodiment of the present invention is divided into three parts.

[Explanation of symbols]

 1 Refrigerator 2, 3 Heat storage tank 4, 5 Ice heat exchanger 6 Heat medium pump 7 Heat medium feed pipe 8 Heat medium return pipe 9, 10, 11, 12 Switching valve 13 Cold / hot water feed pipe 14 Cold / hot water return pipe 15 Cold / hot temperature Water pump 16 Load fan coil unit 17,18 Water level sensor 19 ... Control panel 20 ... Refrigerator 21,22,23 Heat storage tank 24,25,26 Ice-making heat exchanger 27 ... Heat medium pump 28 ... Heat medium feed pipe 29 ... Heat medium return pipe 30, 31, 32, 33, 34, 35 Switching valve 36 Cold / hot water feed pipe 37 Cold / hot water return pipe 38 Cold / hot water pump 39 Load fan coil unit 40, 41, 42 Water level sensor 43 Control panel

Claims (5)

[Claims] 1. A heat storage device comprising at least a heat source device, a heat storage tank, and a piping system for circulating a heat medium therein, wherein the heat storage tank is divided into a plurality of heat storage tanks, and each heat storage tank has a load side. A heat storage device characterized in that a cold / hot water pipe system connected to the above and a switching valve therefor are provided. 2. A heat storage device comprising at least a refrigerator, a heat storage tank, an ice-making heat exchanger in the heat storage tank, and a piping system for circulating a heat medium therethrough, wherein the heat storage device has an ice-making heat exchanger. A plurality of tanks are provided, and for each heat storage tank, a heat medium piping system connected to the refrigerator, a cold / hot water piping system connected to the load side, and a cold / hot water piping system are provided for each of the heat storage tanks. A heat storage device provided with a switching valve that switches a piping system so that the heat is radiated to operate the other heat storage tanks. 3. A heat storage device comprising at least a refrigerator, a water heat storage tank, and a piping system for circulating a heat medium in these, wherein a plurality of water heat storage tanks are provided, and each water heat storage tank is provided with a freezer. A heat medium piping system connected to the machine, a cold / hot water piping system connected to the load side, and each cold / hot water piping are equipped, and one of the multiple water heat storage tanks performs heat dissipation operation and the other water heat storage tank operates heat storage operation. And a switching valve for switching the piping system so that the heat storage device is provided. 4. A heat storage device comprising at least a heat pump, a water heat storage tank, and a piping system for circulating a heat medium through these, wherein a plurality of water heat storage tanks are provided, and each water heat storage tank has a heat pump. The heat medium piping system to be connected, the cold and hot water piping system to be connected to the load side, and each cold and hot water piping are equipped so that one of the multiple water heat storage tanks can perform heat radiation operation and the other water heat storage tank can perform heat storage operation. A heat storage device characterized in that a switching valve for switching the piping system is provided in the. 5. A heat storage device comprising at least a heat source device, a heat storage tank, and a piping system for circulating a heat medium in these, wherein a plurality of heat storage tanks are provided, and each heat storage tank is connected to a load side. A hot / cold water pipe system and its switching valve are provided, and the switching valve of the cold / hot water pipe connected to at least one heat storage tank with a large heat storage capacity of the plurality of heat storage tanks is opened to radiate heat to the load side. Close the switching valve of the cold / hot water pipe of each heat storage tank that is connected to the other heat storage tank, continue the heat storage by circulating the heat medium from the heat source device to the heat storage tank, and the heat storage tank that has finished releasing heat and the heat storage tank. The method for operating the heat storage device is characterized in that the heat storage tank having sufficient heat is sequentially switched to perform the heat storage / heat radiation simultaneous operation.