JP4156296B2 - Ice heat storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice heat storage device, and more particularly to an ice heat storage device that can keep the temperature of cold water supplied to a load side low even if the amount of ice storage in a heat storage tank decreases.
[0002]
[Prior art and its problems]
Conventional ice storage devices store ice produced at night in an ice storage tank, and during the day when the heat load is high, cool water from the melting of ice stored in the ice storage tank is transferred to the load side by a water pump. The return water whose temperature has risen due to the heat exchange on the load side is sprayed on the ice in the ice heat storage tank, cooled, and sent again to the load side.
[0003]
By the way, the ice heat storage device can make ice using night electricity with low electricity charges, so it can be used for facilities that consume large amounts of cold during the day, such as air conditioning in buildings or processes that require cooling of food factories. It is used as a source of cold water, and the temperature of the supplied cold water must always be maintained at a constant low temperature.
[0004]
However, in the conventional ice heat storage device, the ice stored in the ice heat storage tank generated and stored at night is consumed during the day, so the amount of ice stored in the ice heat storage tank (the amount of ice storage) increases over time during the day. When the amount of ice storage gradually decreases and the ice storage amount decreases, the temperature in the ice heat storage tank becomes uneven, and the temperature of the water supplied to the load cannot be kept constant.
[0005]
Therefore, in order to supply water at a constant low temperature to the load side with a conventional ice heat storage device, a sufficient amount of ice must not be stored in the ice heat storage tank at all times. In this case, the volume of the ice heat storage tank is increased, and the ice making device is made large so that a much larger amount of ice can be stored than the amount corresponding to the cold energy consumed per day. In other words, there is a problem that the apparatus becomes large-scale, occupies a large space, and the apparatus cost increases.
[0006]
【the purpose】
The object of the present invention is that the temperature of the cold water supplied to the load side can always be maintained at a constant temperature, and the volume of the ice heat storage tank corresponds to the amount of cold heat consumed per day on the load side. It is an object of the present invention to provide an ice heat storage device that is sufficient if it can store a necessary and sufficient amount of ice and that the space occupied by the device is small and the device cost can be reduced.
[0007]
In order to achieve the above object, an ice heat storage device according to the present invention includes an ice heat storage tank in which water and ice are stored, and a water cooling operation and an ice making operation by controlling the temperature of the supplied water and the cooling capacity. An ice heat storage tank in which sherbet-like ice is stored in which ice is mixed with small pieces of ice by ice-making operation using supercooled water generated by the cooling device while the heat load is small as can be supplied to the load side substantially cooled to a temperature of 0 ° C., always cold cold water constant temperature fluctuation of the load is a large by further cooling device solutions ice water through the return water from the load side within It is as the thing of the structure.
[0008]
In addition, the ice heat storage tank is partitioned into an ice storage part where ice is stored and a non-ice storage part where ice is not stored by a vertical partition plate, and a cold water return pipe from the load side is connected to the non-storage part side, Depending on the temperature of the return water detected by the temperature sensor provided in the middle of the pipe, the deiced water cooled to a low temperature by the ice stored in the storage section and the return in the non-storage section where the ice in the storage section does not contact either water or a mixture of return and water to these solutions ice water to a predetermined temperature Ri sent to the cooling device, always cold water approximately 0 ℃ stably generated and the load side at the same cooling device there as a configuration to allow you to supply.
[0009]
Furthermore, when the cooling device is operated at a cooling capacity of 100%, a predetermined flow rate of water can be cooled by ΔT, and the lower limit value of the capacity capable of stably controlling the cooling capacity of the cooling device is K%. Furthermore, when the temperature of the cold water to be supplied to the load side is T _S , if the heat load is large and the temperature T _{1 of the} return water is T ₁ > T _S + ΔT, The temperature of the mixed water is adjusted to T _S + ΔT by mixing and then sent to the cooling device, and chilled water cooled to a predetermined temperature T _S by the cooling device is supplied to the load side, so that the heat load is relatively If the temperature T _{1 of the} return water is small and T _S + ΔT × K / 100 ≦ T ₁ ≦ T _S + ΔT, the return water is sent to the cooling device and cooled to a predetermined temperature T _S by the cooling device. Is supplied to the load side, the heat load is small, and the temperature T _{1 of the} return water is T ₁ <T _{In the case of S} + ΔT × K / 100, the deicing water is supplied to the load side without being cooled.
[0010]
【Example】
Embodiments of the ice heat storage device according to the present invention will be described below in detail based on specific examples shown in the accompanying drawings.
The ice storage tank 1 is divided into an ice storage part 1A in which ice 3 is stored by a vertical partition plate 2 and a non-ice storage part 1B in which ice is not stored. The ice storage part and the non-ice storage part are at least a lower opening of the vertical partition plate. It communicates with 2a.
[0011]
The other end of the first intake pipe 4 having one end to the non-ice storage portion 1B side is connected is connected to the first inlet port a water intake control valve V ₁ consisting way control valve, also, the ice storage unit 1A side The other end of the second intake pipe 5 is connected to the second inlet port b of the intake control valve V ₁ via the intake header 6 and is connected to the outlet port c of the intake control valve V ₁ at one end. Is connected to the inlet of the cooling device 8 via a water pump P ₁ .
The second intake pipe 5 is connected to a position farthest from the non-ice storage part 1B of the ice heat storage tank 1.
[0012]
The cooling device 8 acts as a water cooling device for supplying cold water or an ice making device for generating ice water by controlling the temperature and cooling capacity of the water supplied from the water supply pipe 7, and generates ice water. In this case, the water from the water pipe is supercooled to a temperature below the freezing point, for example, about −2 ° C., and a special vibration is applied to the supercooled water to release the supercooled state, thereby mixing the ice pieces and water. It is configured to generate so-called sherbet-like ice water.
[0013]
Thus, the other end of the outlet pipe 8a whose one end is connected to the outlet of the cooling device 8 is connected to one end of the cold water supply pipe 10 and the ice supply pipe 11 via the switching mechanism 9, and the cold water supply pipe 10 The other end of the ice supply pipe 11 is connected to the cold water header 12, and the other end of the ice supply pipe 11 faces the ice storage section 1 </ b> A side in the ice heat storage tank 1 from above.
[0014]
The switching mechanism 9 is composed of, for example, on-off valves V ₂ and V ₃ provided in the cold water supply pipe 10 and the ice supply pipe 11, respectively. When one of the on-off valves V ₂ and V ₃ is open, the other is closed. In other words, the open / close state can be switched between each other, and the switching mechanism may be constituted by a three-way open / close valve.
[0015]
The other end of the chilled water outgoing pipe 13 having one end connected to the chilled water header 12 is connected to a load-side cooler 14 such as an air cooling heat exchanger in the air-conditioned room, and the other end is connected to the cooler 14. The other end of the cold water return pipe 15 connected to is connected to face the non-ice storage part 1B side in the ice heat storage tank 1.
[0016]
A first bypass pipe 16 having an on-off valve V ₄ and a bypass pump P ₂ is provided in the middle between the intake header 6 and the cold water header 12, and the cold water outlet pipe 13 and the return pipe 15 are connected to each other. A second bypass pipe 17 is provided between them, and an opening / closing control valve V ₅ is provided in the middle of the second bypass pipe.
[0017]
Thus, any code S ₁ to S ₄ in FIG. 1 shows a temperature sensor for detecting the water temperature in each section of the device, in particular downstream of the connection portion of the second bypass pipe 17 in the cold water condensate pipe 15 The provided temperature sensor S ₁ detects the return water temperature T ₁ from the load side cooler 14, and the temperature sensor S ₂ provided on the downstream side of the water supply pump P ₁ in the water supply pipe 7 is at the inlet of the cooling device 8. The temperature sensor S ₃ provided to the outlet pipe 8 a of the cooling device 8 detects the water temperature T ₂ of the supplied water, detects the water temperature T ₃ at the outlet of the cooling device, and the temperature sensor S provided to the cold water outgoing pipe 13. ₄ detects the supply water temperature T ₄ to the load side.
[0018]
Next, control of each part in the apparatus of the present invention configured as described above will be described.
In the apparatus of the present invention, the cooling-only operation mode and the de-icing / cooling operation mode in which the water in the ice heat storage tank 1 is cooled by the cooling device 8 and supplied to the load side, the cooling device 8 stops, and the ice heat storage De-icing operation mode that supplies water to the load side without cooling the water in the tank, and supplies water to the load side as it is without cooling the water in the ice heat storage tank, while cooling the water in the ice heat storage tank There are four operating modes of the ice-making operation mode for generating ice, and return water temperatures T ₁ from the load side switching detected by the temperature sensor S ₁ in principle of these operating modes, the cooling capacity of the cooling device 8 And the ice storage condition in the ice storage tank.
[0019]
By the way, if the temperature of the predetermined amount of water can be lowered by ΔT ° C. when the cooling device is driven with a cooling capacity of 100%, the temperature of water to be supplied to the load side (supply water set temperature) T _S The temperature T ₂ of water supplied to the cooling device is 0 ≦ T ₂ ≦ T _S + ΔT
Must.
[0020]
Therefore, the heat load is large, and the return water temperature T ₁ from the load side is T ₁ > T _S + ΔT.
In this case, the return water from the load side and the deicing water in the ice storage section 1A of the ice heat storage tank at approximately 0 ° C. are mixed by the three-way control valve V _{1 and} the temperature of the water supplied to the cooling device T ₂ is T ₂ = T _S + ΔT
Then, chilled water is supplied to the load side cooler 14 by the chilled water outgoing pipe 13 (ice removal / cooling operation mode).
[0021]
The mixing of the return water and the deicing water described above is based on the supply water temperature T ₂ to the cooling device 8 detected by the temperature sensor S ₂ , and the first _one in the three-way control valve V ₁ is T ₂ = T _S + ΔT. The opening degree on the inlet port a side and the second inlet port b side is automatically controlled.
[0022]
In addition, the heat load T is relatively small and the return water temperature T ₁ from the load side is T ₁ ≦ T _S + ΔT.
In this case, the return water can be cooled to the supply water set temperature T _S by the cooling device 8, so that the ice in the ice heat storage tank 1 is not defrosted, and the cold water return pipe 15 does not melt the ice in the tank. The return water returned into the ice storage section 1B is led out from the first intake pipe 4 without contacting the ice in the tank, cooled to the supply water set temperature T _S by the cooling device 8, and cooled by the chilled water outgoing pipe 13. Chilled water is supplied to the load side cooler 14 (cooling-only operation mode).
[0023]
When returning water is cooled by the cooling device 8 as described above, the temperature T ₂ of water supplied to the cooling device is:
T ₂ = T ₁ ≦ T _S + ΔT
∴T _S ≧ T ₁ −ΔT
So,
T _S = T ₁ −ΔT × K / 100 (0 ≦ K ≦ 100)
The capacity control of the cooling device of K% is performed in accordance with the difference between the return water temperature T ₁ and the supply water set temperature T _S.
[0024]
However, in the capacity control operation of the cooling device 8, the cooling efficiency decreases as the capacity decreases. Therefore, when the heat load decreases and the capacity of the cooling device reaches a preset value, for example, 50% (K = 50), the cooling is performed. The operation of the apparatus is stopped, and the deicing water in the ice storage section 1A of the ice heat storage tank is sent to the load side cooler 14 without being cooled (deicing only operation).
[0025]
The lower limit of the value of the capacity K that determines the switching from the cooling-only operation to the ice-free operation described above varies depending on the specifications of the cooling device 8, but is generally set to 30% to 70%.
[0026]
Therefore, in the ice melting operation, the ice melting water in the ice storage section 1A of the ice heat storage tank 1 at approximately 0 ° C. is sent to the cooling device 8 through the second intake pipe 5 and the water supply pipe 7, and in the cooling apparatus. It passes without being cooled and is supplied to the load side cooler 14 through the outlet pipe 8a, the cold water supply pipe 10 and the cold water forward pipe 13.
[0027]
When the heat load is extremely small in this ice melting exclusive operation, the open / close control valve V ₅ of the second bypass pipe 17 is opened to adjust the amount of cold water supplied to the load side cooler 14.
[0028]
In addition, when the heat load is small and the ice storage amount is small, the deicing water in the ice heat storage tank is sent to the cooling device 8 for supercooling, so-called sherbet in which small pieces of ice and water are mixed. Ice water is generated and sent into the ice heat storage tank, while the deicing water in the ice heat storage tank is supplied to the load side cooler 14 by the first bypass pipe 16 and the cold water forward pipe 13 (ice making operation).
[0029]
At this time, the cooling device is operated with a cooling capacity of 100%, and the temperature of the deicing water that is approximately 0 ° C. is lowered by ΔT ° C. to cool to a temperature below the freezing point, that is, a state of supercooling.
In addition, the ice making operation described above is performed at night, and the running cost is reduced by using night electricity as power for ice making. However, if the heat load is small and the amount of ice stored is small. For example, ice making operation may be performed at night.
[0030]
Next, the operation of the device of the present invention in each operation mode will be specifically described based on the relation table shown in FIG.
In the following specific example, when the cooling device is operated at a cooling capacity of 100%, it is assumed that the water at a predetermined flow rate can be lowered by 2 ° C. (ΔT = 2 ° C.), and the lower limit value of the capacity control of the cooling device. Is 50% (K = 50), and the set temperature to be supplied to the load side is 0 ° C. (T ₃ = 0 ° C.).
Therefore, when the return water temperature T ₁ detected by the temperature sensor S ₁ exceeds 2 ° C, the ice-freezing / cooling operation is performed. In the case of, ice-only operation or ice-making operation is performed.
[0031]
<Ice making operation>
The ice making operation is performed when the heat load at which the return water temperature T ₁ detected by the temperature sensor S ₁ is less than 1 ° C. is small and the ice storage amount is not full. As a rule, it is performed at night.
[0032]
In this ice making operation, the three-way control valve V ₁ is fully opened to the second inlet port b side, the water pump P ₁ is driven, the cooling device 8 is operated with a cooling capacity of 100%, and the switching mechanism 9 is Open on the supply pipe 11 side, that is, the on-off valve V ₂ is closed and V ₃ is opened.
Further, the on-off valve V ₄ of the first bypass pipe 16 is opened and the bypass pump P ₂ is driven.
[0033]
Accordingly, the deicing water, which has reached approximately 0 ° C. due to contact with the ice 3 in the ice storage section 1A of the ice heat storage tank 1, flows into the intake header 6 from the second intake pipe 5 by driving the pumps P ₁ and P _2. The deicing water in the header is sent to the water pipe 7 and the bypass pipe 16.
[0034]
The deicing water that has flowed into the water supply pipe 7 is sent to the cooling device 8, where it is cooled by 2 ° C. to become super-cooling water of about −2 ° C., and this super-cooling water enters the cooling device or the outlet pipe 8a. The ice is mixed with small pieces of ice and water, and is supplied into the ice heat storage tank 1 through the ice supply pipe 11.
[0035]
Further, the deicing water flowing into the bypass pipe 16 is sent to the load side cooler 14 through the cold water header 12 through the cold water header 12, and the temperature is raised by exchanging heat with the heat load in the cooler. Then, it is sent to the non-ice storage part 1 </ b> B of the ice heat storage tank 1 by the cold water return pipe 15.
[0036]
The return water in the non-ice storage part 1B flows into the ice storage part 1A from the opening 2a at the lower part of the vertical partition plate 2, contacts with the ice 3 in the ice storage part, is cooled to almost 0 ° C. 2 Derived from the intake pipe 5 to the outside.
[0037]
Therefore, ice is made in the cooling device 8 and ice is stored in the ice heat storage tank 1, and the ice cooler at approximately 0 ° C. is supplied from the ice storage section 1 A of the ice heat storage tank 1 to the cooler 14 on the load side. Is done.
[0038]
<De-icing operation>
When the return water temperature T ₁ from the load side detected by the temperature sensor S ₁ is less than 1 ° C. or when the ice in the ice heat storage tank becomes full due to the ice making operation at night, the three-way control valve V ₁ Fully opened on the second inlet port b side, the water pump P ₁ is driven, the cooling device 8 is stopped, the switching mechanism 9 is opened on the cold water supply pipe 10 side, that is, the on-off valve V ₂ is opened, and V ₃ is closed. Is done.
Further, the on-off valve V ₄ of the first bypass pipe 16 is closed and the bypass pump P ₂ is also stopped.
[0039]
Thus, the deicing water, which is approximately 0 ° C. due to contact with the ice 3 in the ice storage section 1A of the ice heat storage tank 1, flows into the intake header 6 from the second intake pipe 5 by the drive of the pump P _1. The deicing water inside is sent to the water pipe 7.
[0040]
The deicing water that has flowed into the water supply pipe 7 is sent to the cooling device 8, but since the cooling device is in a stopped state, the deicing water is sent from the outlet pipe 8a at the same temperature, and the cold water supply pipe 11, the cold water header 12 is sent to the cooler 14 on the load side by the chilled water outgoing pipe 13.
[0041]
The water whose temperature has been increased by heat exchange with the heat load in the cooler 14 is sent to the non-ice storage part 1B of the ice heat storage tank 1 through the cold water return pipe 15 and from the opening 2a below the vertical partition plate 2 It flows into the ice storage unit 1A, contacts with the ice 3 in the ice storage unit, is cooled to approximately 0 ° C., and is led out from the second intake pipe 5 as deiced water again.
[0042]
Therefore, although the cooling device 8 is stopped, the ice cooler at approximately 0 ° C. is supplied from the ice storage section 1A of the ice heat storage tank 1 to the cooler 14 on the load side.
[0043]
<Exclusive cooling operation>
When the heat load increases and the return water temperature T ₁ from the load side detected by the temperature sensor S ₁ becomes 1 ° C. or higher and 2 ° C. or lower, the three-way control valve V ₁ is fully opened to the first inlet port a side. At the same time, the water pump P ₁ is driven, the cooling device 8 is operated, the switching mechanism 9 is opened on the cold water supply pipe 10 side, that is, the on-off valve V ₂ is opened, and V ₃ is closed.
[0044]
Thus return water returned to the ice thermal storage tank from the load side by the water ie cold condensate pipe 15 of the non-ice storage portion 1B of the ice thermal storage tank 1, the water pipe 7 from the first intake pipe 4 by the driving of the pump P ₁ The deicing water that has been sent and flowed into the water pipe 7 is sent to the cooling device 8.
[0045]
In the cooling device, capacity control of the cooling capacity is performed based on the supply water temperature T ₂ detected by the temperature sensor S ₂ provided in the water pipe.
More specifically, the supply water temperature T ₂ is ₁ to 2 ° C. which is substantially the same as the return water temperature T _1, and the set temperature T ₃ to be supplied to the load side is 0 ° C. Therefore, the cooling device 8 is connected to the supply water temperature T 2. The capacity of the cooling capacity is controlled to 50 to 100% according to the difference from the set temperature T ₃ .
[0046]
The cold water cooled to the set temperature of 0 ° C. by the cooling device 8 is sent from the outlet pipe 8a to the load side cooler 14 through the cold water supply pipe 11 and the cold water header 12 through the cold water forward pipe 13.
[0047]
The water whose temperature has been raised by heat exchange with the heat load in the cooler 14 is sent to the non-ice storage part 1B of the ice heat storage tank 1 through the cold water return pipe 15, and is stored in the ice storage part 1A. 3, the first intake pipe 4 is led out to the outside at substantially the same temperature without contact with the first intake pipe 3.
[0048]
The return water from the cold water return pipe 15 passes through the non-ice storage part 1B partitioned by the vertical partition plate 2 from the ice storage part 1A and does not come into contact with the ice in the ice storage part. Therefore, the amount of ice stored in the ice heat storage tank is maintained almost constant in this cooling-only operation.
[0049]
The return water may contain bubbles depending on the usage state in the cooler 14 on the load side, but the bubbles in the return water are separated by flowing into the ice storage part 1B and into the first intake pipe 4. Air bubbles are prevented from entering.
[0050]
<De-icing / cooling operation>
When the heat load further increases and the return water temperature T ₁ from the load side detected by the temperature sensor S ₁ exceeds 2 ° C., the three-way control valve V ₁ is connected to the first inlet port a side and the second inlet port b. The water supply pump P ₁ is driven and the cooling device 8 is operated, the switching mechanism 9 is opened on the cold water supply pipe 10 side, that is, the on-off valve V ₂ is opened and V ₃ is closed.
[0051]
Accordingly, the water in the non-ice storage portion 1B of the ice heat storage tank 1, that is, the return water returned to the ice heat storage tank from the load side by the cold water return pipe 15 by the drive of the water supply pump P ₁ is transferred from the first intake pipe 4 to the three-way control valve. V ₁ enters the first inlet port a and is sent from the outlet port c to the water supply pipe 7, and the deicing water that has reached approximately 0 ° C. due to contact with the ice 3 in the ice storage unit 1 A is discharged from the second intake pipe 5. The water enters the second inlet port b of the three-way control valve V ₁ through the intake header 6 and is sent to the water pipe 7 from the outlet port c.
That is, the return water in the non-ice storage part 1B and the deicing water in the ice storage part 1A are mixed together and sent out from the water pipe 7 to the cooling device 8.
[0052]
The three-way control valve V ₁ has openings on the first inlet port a side and the second inlet port b side based on the supply water temperature T ₂ to the cooling device detected by the temperature sensor S ₂ provided in the water pipe 7. Specifically, when the supply water temperature T ₂ is always 2 ° C., that is, when the cooling device has a cooling capacity of 100%, the outlet water temperature of the first inlet port a and the first Therefore, when the return water temperature rises, the opening on the first inlet port a becomes smaller and the opening on the second inlet port b becomes larger.
At this time, the cooling device 8 is operated so that the cooling capacity becomes 100%.
[0053]
The cold water cooled to the set temperature of 0 ° C. by the cooling device 8 is sent from the outlet pipe 8a to the load side cooler 14 through the cold water supply pipe 11 and the cold water header 12 through the cold water forward pipe 13.
[0054]
The water whose temperature is increased by heat exchange with the heat load in the cooler 14 is sent to the non-ice storage part 1B of the ice heat storage tank 1 through the cold water return pipe 15, and a part of the return water is the ice storage part. It is led out from the first intake pipe 4 at substantially the same temperature without coming into contact with the ice 3 stored in 1A, and the rest of the return water is stored in the ice storage section from the opening 2a below the vertical partition plate 2. It flows into 1A, contacts with the ice 3 in the ice storage section, is cooled to about 0 ° C., and is led out from the second intake pipe 5 as deicing water again.
[0055]
Therefore, in this cooling / de-icing operation, it is not necessary to change the cooling capacity of the cooling device while keeping the cooling capacity constant at 100% even if the fluctuation of the thermal load is large, and the automatic opening degree at the three-way control valve V ₁ By controlling, it is possible to immediately respond to the fluctuation of the load, and the temperature T ₄ of the water supplied to the load side can always be kept constant.
[0056]
Although the embodiment described above is configured to include one of the cooling device 8, a structure comprising a plurality of cooling devices, from the three-way control valve V _1, the water pump P _1, the cooling device 8, switching mechanism 9 and cold water supply pipe In some cases, a plurality of water supply paths leading to 10 and the ice supply pipe 11 are provided in parallel. In this case, the operation of each water supply path and the ice making and cooling operations of each cooling device are individually controlled to cope with fluctuations in heat load. Then, the number of operating cooling units and capacity control are performed. In this way, it is sufficient that the cooling device and the water pump are small, and when the load is small, the number of operating cooling devices and the number of water pumps can be minimized, thereby reducing the running cost. be able to.
[0057]
[Operation and effect of the present invention]
According to the present invention, since the water in the ice heat storage tank is cooled to a predetermined temperature by the cooling device and then sent to the load side, the temperature of the water derived from the ice heat storage tank due to the decrease in the amount of ice stored in the ice heat storage tank Even if fluctuates, the temperature of the cold water supplied to the load side can always be maintained at a constant temperature.
[0058]
Therefore, it is sufficient that the ice storage tank has a capacity that can store a necessary and sufficient amount of ice corresponding to the amount of cold consumed per day on the load side. Can be reduced.
[0059]
In addition, the ice storage tank is partitioned into an ice storage part and a non-ice storage part by a partition plate that opens at the bottom, and the return water from the load side is allowed to flow into the non-ice storage part, and the fluctuation of the heat load, that is, the load Depending on the temperature change of the return water from the side, either the deiced water in the ice storage part and the return water in the non-ice storage part or these are mixed and adjusted to the required temperature before being supplied to the cooling device. Even if fluctuates rapidly, low-temperature cold water having a constant temperature can always be supplied to the load side.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of an ice heat storage device according to the present invention.
FIG. 2 is a table showing an example of operation control of the apparatus according to the first embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ice thermal storage tank 2 Vertical partition plate 3 Ice 4 1st intake pipe 5 2nd intake pipe 6 Intake header 7 Water supply pipe 8 Cooling device 9 Switching mechanism 10 Cold water supply pipe 11 Ice supply pipe 12 Cold water header 13 Cold water forward pipe 14 Load side Cooler 15 Cold water return pipe 16 First bypass pipe 17 Second bypass pipe V ₁ Three-way control valve V ₂ , V ₃ , V ₄ Open / close valve V ₅ Open / close control valve S ₁ , S ₂ , S ₃ , S ₄ Temperature sensor

Claims (3)

Equipped with an ice heat storage tank that stores water and ice, and a cooling device that can switch between water cooling and ice making operations by controlling the temperature and cooling capacity of the supplied water, and cooling while the heat load is small A cooling device that further supplies deiced water that has passed through the return water from the load side into an ice heat storage tank in which sherbet-like ice mixed with small pieces of ice and water is mixed by ice-making operation using supercooled water generated by the device The ice heat storage device that cools to a temperature of approximately 0 ° C. and can always supply low-temperature cold water at a constant temperature to the load side even if the load fluctuates greatly. The ice heat storage tank is partitioned into an ice storage part where ice is stored and a non-ice storage part where ice is not stored by a vertical partition plate, and a cold water return pipe from the load side is connected to the non-storage part side, Depending on the temperature of the return water detected by the temperature sensor provided in the middle, the deicing water cooled to a low temperature by the ice stored in the storage section and the return water in the non-storage section that does not contact the ice in the storage section Ri feed and any or water return these solutions ice to the cooling device as a mixture to a predetermined temperature, to always supply the cold water approximately 0 ℃ to stably generated by the load-side at the same cooling device The ice heat storage device according to claim 1, wherein the ice heat storage device can be used. When the cooling device is operated at a cooling capacity of 100%, a predetermined flow rate of water can be cooled by ΔT, and the lower limit value of the capacity capable of stably controlling the cooling capacity of the cooling device is K%. When the temperature of cold water to be supplied to the load side is T _S ,
The heat load is large and the temperature T _{1 of the} return water is T ₁ > T _S + ΔT
In this case, the temperature of the mixed water is adjusted to T _S + ΔT by mixing the deicing water and the return water, and then sent to the cooling device, and the chilled water cooled to the predetermined temperature T _S by the cooling device is supplied. Supply to the load side,
The heat load is relatively small and the temperature T _{1 of the} return water is T _S + ΔT × K / 100 ≦ T ₁ ≦ T _S + ΔT
If it is, the return water is sent to the cooling device, and the cold water cooled to the predetermined temperature T _S by the cooling device is supplied to the load side,
Furthermore, the heat load is small, and the temperature T _{1 of the} return water is T ₁ <T _S + ΔT × K / 100
In such a case, the ice heat storage device according to claim 2, wherein the ice heat storage device is configured to be supplied to the load side without cooling.

Images