JP3907822B2 - Ice heat storage device and method of operating ice heat storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice heat storage device and an operation method of the ice heat storage device, and more particularly to an ice heat storage device and an operation method of the ice heat storage device that can prevent a lack of cooling capacity during operation using cold water.
[0002]
[Prior art]
An ice heat storage device has been widely used in recent years because it can not only use late-night power for heat storage but also has a very high heat storage capacity. As such an ice heat storage device, a cooling coil and a water storage tank whose water surface is maintained below the cooling coil are provided, and the stored water from the water storage tank is received on the outer surface of the cooling coil during ice making operation to cool the cooling coil. Ice is formed and stored on the outer surface, and in cold water operation, the water stored in the water tank is supplied to the cold water utilization section and used, and then the used water is allowed to flow around the ice surface on the outer surface of the cooling coil. An ice heat storage device of a type that cools and circulates the cooled water to a water storage tank is known. A falling liquid film type ice heat storage device disclosed in Japanese Patent Laid-Open No. 5-240538 (Japanese Patent Publication No. 8-20152) by the present applicant corresponds to this type.
[0003]
FIG. 3 shows a specific example 100 of a conventional falling liquid film type ice heat storage device, in which a lower part of a casing 104 is a water storage tank 102 and the inside of the casing 104 is used for making ice above the water surface of the water storage tank 102. A cooling coil 101 through which the refrigerant passes is disposed, and a plurality of watering devices are disposed above the cooling coil 101. The cooling coil 101 is connected to a refrigerator 105 outside the casing 104, and an ice-making refrigerant is circulated between the cooling coil 101 and the refrigerator 105.
[0004]
At the time of ice making, water in the water storage tank 102 is directly supplied to the sprinkler 103 by the ice-making water supply pump 106 and sprayed from the sprinkler 103 onto the cooling coil 101. In the process of flowing down the outer surface of the cooling coil 101 from the upper part to the lower part, the sprayed water is cooled by the ice-making refrigerant circulating in the cooling coil 101 to become ice. The icing position gradually advances from the lower part to the upper part of the cooling coil 101 and finally reaches the entire cooling coil 101. In this way, ice is stored on the outer surface of the cooling coil 101.
[0005]
On the other hand, during the cold water use operation, the cold water in the water storage tank 102 is supplied to the cold water use unit 110 by the cold water supply pump 111 and is used (heat exchange) in the cold water use unit 110. Next, the used water is supplied to the sprinkler 103 and sprayed from the sprinkler 103. The sprayed water is cooled while flowing down around the surface of the ice stored on the surface of the cooling coil 101, and then returned to the water storage tank 102. At this time, some ice peels off from the cooling coil 101 and falls, and this falling ice cools the water in the water storage tank 102.
[0006]
Conventionally, in such a falling liquid film type ice heat storage device, in order to always obtain cold water having a water temperature required in the cold water utilization unit 110 during cold water utilization operation, it is more than the amount required for one cold water utilization operation. A large amount of ice (hereinafter also referred to as extra ice storage) was produced and stored. In this case, a certain amount of ice remains on the outer surface of the cooling coil 101 even after the cold water operation is finished.
[0007]
On the other hand, in the falling liquid film type ice heat storage device, the amount of water stored in the water storage tank 102 is reduced by the amount of ice stored in the cooling coil 101. Further, the sum of the ice storage amount and the water storage amount is equal to the initial water storage amount (the water storage amount when the ice amount is 0) and is constant. Therefore, conventionally, for example, before the start of ice making operation, the amount of water stored in the water storage tank 102 is measured, and the amount of remaining ice in the cooling coil 101 is obtained by taking the difference between this amount of stored water and the initial amount of stored water. Based on the above, the amount of ice making during the ice making operation was determined.
[0008]
[Problems to be solved by the invention]
However, in such a conventional falling liquid film type ice heat storage device, the cooling capacity is insufficient during the operation using cold water, and cold water having a desired temperature may not be obtained.
[0009]
Therefore, a main problem of the present invention is to prevent a lack of cooling capacity during operation using cold water, which occurs in a falling film type ice heat storage device.
[0010]
[Means for Solving the Problems]
Of the present invention that has solved the above problems, the ice heat storage device according to claim 1 includes a cooling coil and a water storage tank in which a water surface is maintained below the cooling coil.
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage In an ice storage device to be circulated in the tank;
A replenishing means for supplying makeup water from the outside to the water tank, and a water temperature measuring means for measuring the temperature of the water to be supplied to the cold water utilization unit,
If the measured water temperature by the water temperature measuring means exceeds a set temperature during the cold water use operation, then supply water is supplied to the water tank by the replenishing means, and the water stored in the water tank is supplied to the cooling coil. It is characterized in that the remaining ice is melted by flowing down the remaining ice surface on the outer surface.
[0011]
The ice heat storage device according to claim 2 includes a cooling coil and a water storage tank in which a water surface is maintained below the cooling coil.
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage In an ice storage device to be circulated in the tank;
Replenishing means for supplying makeup water from the outside to the water tank;
Water storage amount adjusting means in the water tank;
Water temperature measuring means for measuring the temperature of the water supplied to the cold water utilization unit,
When there is residual ice on the outer surface of the cooling coil, supply water is supplied to the water storage tank by the replenishing means, and the water stored in the water storage tank is allowed to flow around the residual ice surface of the outer surface of the cooling coil. The residual ice is melted, and the amount of water stored in the water tank after melting is adjusted to a predetermined amount by the water storage amount adjusting means, and the water temperature measured by the water temperature measuring means is set during the cold water use operation. When the temperature is exceeded, supply water is then supplied to the water storage tank by the replenishing means, and the water stored in the water storage tank is allowed to flow around the remaining ice surface on the outer surface of the cooling coil to remove the residual ice. The water storage amount in the water storage tank after being melted is adjusted to a predetermined amount by the water storage amount adjusting means.
[0012]
On the other hand, the operation method of the ice heat storage device according to claim 3 includes a cooling coil and a water storage tank in which a water surface is maintained below the cooling coil,
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage Using an ice storage device to circulate in the tank;
Measure the temperature of the water supplied to the cold water utilization unit during the cold water utilization operation, and when the measured water temperature exceeds a set temperature, then supply makeup water from the outside to the water tank, and The method is characterized in that the water stored in the tank is made to flow down around the surface of the remaining ice on the outer surface of the cooling coil to melt the remaining ice.
[0013]
<Action>
The present inventor has found that the cooling capacity deficiency during the cold water use operation that occurs in the falling film type ice heat storage device is due to at least the following two causes.
[0014]
(A) First cause The first cause is bridging in the cooling coil. That is, in this type of ice heat storage device, the next ice making operation is performed while leaving the ice in the cooling coil without using up all the ice by the cold water operation as described above. Then, in this ice making operation, the remaining ice portion is also icing, so that the remaining ice portion grows into thicker ice than the surroundings. In addition, since this thick ice is naturally difficult to melt in the subsequent operation using cold water, it remains as thicker ice after the operation. As described above, as the ice making operation and the cold water production operation are repeated, a large ice block straddling the cooling coils is formed at a specific portion of the cooling coil.
[0015]
And when such bridging occurs, the surface area of ice becomes extremely small, the inside of the ice block does not substantially contribute to cooling, and the ice is unevenly distributed in the ice block part, so that it does not contact the ice. Alternatively, the cooling capacity is remarkably lowered by increasing the amount of water that comes into contact but is hardly cooled and reaches the water storage tank. As a result, even though a necessary and sufficient amount of ice remains in the cooling coil, the cooling capacity is insufficient during the operation using cold water, and cold water having a desired temperature cannot be obtained. Hereinafter, such ice or ice portion that does not substantially contribute to cooling is referred to as invalid ice, and conversely, effective ice or ice portion that substantially contributes to cooling is also referred to as effective ice.
[0016]
When this water temperature rise phenomenon is seen over time, a graph shown in FIG. 4 is obtained. When ice making operation (solid line) and cold water use operation (dotted line) are repeated, there is no abnormality in the amount of ice stored, but as the time goes by, invalid ice increases as indicated by the two-dot chain line, and effective ice increases. Will decrease. And if there is no effective ice in the cooling coil during the operation using cold water and there is only invalid ice, it seems that the ice is stored in the cooling coil in spite of the apparent amount of ice stored in the cooling coil. The temperature of the water supplied to the cold water utilization section suddenly rises.
[0017]
(B) Second cause As a second cause, there is a partial disappearance of retained water due to evaporation, leakage, etc. of water outside the water circulation path. That is, conventionally, for example, the amount of stored water is measured before the start of ice making operation, the amount of remaining ice is obtained based on the relationship between this measurement result and “initial amount of stored water = stored amount + ice stored amount”, and based on this amount of remaining ice, The amount of ice making in the ice making operation was determined. Therefore, when a part of the retained water has disappeared, the amount of ice making is reduced by estimating the amount of remaining ice too much, resulting in insufficient cooling capacity during the next cold water operation.
[0018]
The present invention has been made on the basis of these findings. First, the ice heat storage device according to claim 1 measures the temperature of the water supplied to the cold water utilization section by the water temperature measuring means, and the measured water temperature is the set temperature. In this case, only the invalid ice remains in the cooling coil, so that the supply water is supplied to the water storage tank by the replenishing means, and the water stored in the water storage tank is used as the remaining ice surface on the outer surface of the cooling coil. The remaining ineffective ice is melted by flowing down the water.
[0019]
By melting the remaining ice in this manner, the invalid ice is eliminated or reduced, and a lack of cooling capacity during the operation of using cold water due to the increase in the invalid ice (the first cause described above) can be prevented. In addition, if the remaining ice is melted on the condition that the remaining ice becomes only invalid ice during the operation using cold water, it is not necessary to melt unnecessary ice, and the operating cost of the apparatus can be minimized. .
[0020]
Next, the ice heat storage device according to claim 2 supplies replenishment water to the water storage tank by the replenishment means at the time when there is residual ice on the outer surface of the cooling coil, and the stored water in the water storage tank In addition to melting the remaining ice while flowing down the ice surface, the amount of water stored in the water storage tank after melting is adjusted to a predetermined amount by the storage amount adjusting means.
[0021]
In this way, the residual ice is melted with the makeup water, and the stored water amount in the storage tank after melting is adjusted to a predetermined amount by the stored water amount adjusting means, so that the retained water amount is surely reset, and a part of the retained water is If it has disappeared, water for that disappearance is replenished.
[0022]
Therefore, in this ice heat storage device, the invalid ice is eliminated or reduced by melting the residual ice, and it is only possible to prevent the lack of cooling capacity during the operation of using cold water due to the increase in invalid ice (the first cause described above). Without resetting the amount of retained water, it is possible to prevent a lack of cooling capacity due to partial disappearance of the retained water (the second cause described above).
[0023]
Further, in the ice heat storage device according to claim 2, when water temperature measuring means for measuring the temperature of the water supplied to the cold water utilization unit is provided, and the measured water temperature by the water temperature measuring means exceeds the set temperature during the cold water use operation Then, the replenishing means supplies the replenishing water to the water storage tank, and the stored water in the water storage tank flows down around the remaining ice surface on the outer surface of the cooling coil to melt the residual ice, and in the water storage tank after melting The stored water amount is adjusted to a predetermined amount by the stored water amount adjusting means.
[0024]
Therefore, in this ice heat storage device, it is possible to prevent insufficient cooling capacity during cold water use operation due to the increase in invalid ice due to melting of residual ice, and to prevent insufficient cooling capacity due to partial loss of retained water by resetting the amount of retained water In addition, by melting the remaining ice on the condition that the remaining ice becomes only invalid ice during the operation using cold water, it is not necessary to thaw unnecessary residual ice and minimize the operating cost of the device. be able to.
[0025]
Since the operation method of the ice heat storage device according to the third aspect is the same as the operation of the ice heat storage device according to the first aspect, a description thereof is omitted here.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a flow chart of an ice thermal storage air conditioning system 1 using a falling liquid film type ice thermal storage device 10 according to the present invention. In this ice heat storage device 10, a lower portion of a casing 14 is a water storage tank 12, a cooling coil 11 through which ice-making refrigerant passes is disposed above the water surface of the water storage tank 12 in the casing 14, and above the cooling coil 11. A plurality of watering devices are provided. In the casing 14, a water level measuring means 16 for measuring the water level of the water storage tank 12 is provided. As the water level measuring means 16, a non-contact type sensor such as an ultrasonic sensor is preferably used, but a contact type sensor can also be used. On the other hand, outside the casing 14, a refrigerator 15 that circulates and circulates ice-making refrigerant in the cooling coil 11 is installed. P1 represents an ice-making refrigerant circulation pump.
[0027]
In the present system 1, the water storage tank 12 of the ice heat storage device 10 and the air conditioner 2 serving as the cold water use section are connected by a cold water supply path R1 having a cold water supply pump P2, and the air conditioner 2 and the water sprinkler 13 are connected to the hot water return path. Connected by R2, a water circulation path during cold water use operation is formed. Further, the cold water supply path R1 and the hot water return path R2 are connected by an ice making water supply path R3 to form a water circulation path during ice making operation, and an ice making water supply pump P3 is arranged in the ice making water supply path R3. It is installed.
[0028]
And in this structure, in order to measure the temperature of the water supplied from the water storage tank 12 to the air conditioner 2 according to the present invention, the water temperature measuring means 19 is provided near the water storage tank 12 of the cold water supply path R1. Further, as a replenishing means, a replenishing water adjusting valve B1 is provided, a replenishing water channel 17 leading to the inside of the casing 14 is provided on the upper side of the water storage tank 12, and a water storage amount in the water storage tank 12 is set to a predetermined amount (for example, a water storage amount adjusting means). An overflow path 18 is provided for discharging the stored water in the water storage tank 12 to the outside at least after the remaining ice melts when the amount exceeds the initial water storage amount.
[0029]
Hereinafter, the operation method of the ice heat storage type air conditioning system 1 will be described.
<Ice making operation>
During ice making, the ice making refrigerant circulation pump P1 circulates the ice making refrigerant between the refrigerator 15 and the cooling coil 11, and the water in the water storage tank 12 is returned to the cold water supply path R1, the ice making water supply path R3, and the hot water return. The water is supplied to the sprinkler 13 via the path R <b> 2, and is sprayed from the sprinkler 13 toward the coiled cooling coil 11. In the process of flowing down the surface of the cooling coil 11 from the upper part to the lower part, the sprayed water is cooled by the ice-making refrigerant passing through the cooling coil 11 to become ice. This icing position gradually moves from the lower part to the upper part of the cooling coil 11. In a normal case, the entire cooling coil 11 is iced. In this way, ice is stored on the surface of the cooling coil 11.
[0030]
Extra ice storage amount was added to the amount of ice storage required for one cold water use operation (ie, the amount of ice that can continue to send cold water within the allowable water temperature range of the cold water use section during one cold water use operation) When the amount is reached, finish the ice making operation.
[0031]
This ice making amount is determined according to the remaining ice amount before the start of the ice making operation. This residual ice amount can be obtained from the difference between the water storage amount before the start of the ice making operation and the initial water storage amount as in the conventional example. That is, as shown in FIG. 2, the water level measurement means 16 measures the water level of the water storage tank 12, determines the difference between this measured water level and the initial water level (the water level of the ice making section when the ice storage amount is 0). Based on the difference and the size of the water storage tank 12, a difference between the water storage amount of the water storage tank 12 and the initial water storage amount is obtained, and this is defined as the amount of remaining ice.
[0032]
<Cold water operation>
When using cold water, the cold water in the water storage tank 12 is supplied to the air conditioner 2 via the cold water supply path R1 and used (heat exchange) in the air conditioner 2. Next, the used water is supplied to the sprinkler 13 via the hot water return path R <b> 2 and sprayed onto the cooling coil 11 from the sprinkler 13. The sprayed water is gradually cooled in the process of flowing down the surface of the ice stored on the outer surface of the cooling coil 11, and then dropped and supplied to the water storage tank 12. At this time, the ice adhering to the cooling coil 11 melts. There is also ice that peels off from the cooling coil 11 due to melting and falls, and the water in the water storage tank 12 is cooled by the falling ice. The water cooled and returned to the water storage tank 12 is supplied to the air conditioner 2 again. In addition, for example, when cold water having a temperature required by the air conditioner 2 cannot be sent due to a shortage of ice storage, ice making operation can be performed simultaneously.
Further, during such cold water use operation, the temperature of the cold water supplied from the water storage tank 12 to the air conditioner 2 is measured by the water temperature measuring means 19, and the measured water temperature and the set temperature (for example, the upper limit of the cold water temperature necessary for the air conditioner 2, More specifically, the comparison with 7 ° C. is performed periodically or continuously. As a result, if the measured water temperature of the water temperature measuring means 19 does not exceed the set temperature during the cold water operation, the ice making operation is performed again after the cold water operation.
[0033]
On the other hand, when the measured water temperature of the water temperature measuring means 19 exceeds the set temperature during the cold water use operation, for example, after the cold water use operation is completed, the following residual ice melting and retained water amount reset operation are performed.
[0034]
<Remaining ice melting and retained water volume reset operation>
In the actual operation, first, the makeup water adjustment valve B1 is opened, and makeup water (eg, normal temperature or high temperature water such as tap water) is supplied from the outside to the water storage tank 12 through the makeup water channel 17. When the amount of water stored in the water storage tank 12 reaches the overflow level, the water in the water storage tank 12 is discharged via the overflow path 18. When this drainage begins, the make-up water adjustment valve B1 is closed and the ice making water supply pump P3 is operated to supply the water in the water storage tank 12 to the cold water supply path R1, the ice making water supply path R3, the hot water return path R2, and the water sprinkler. 13, the cooling coil 11 arrangement part, and the water storage tank 12 are circulated in this order. In this case, the cold water supply pump P2 is operated to circulate the water in the water storage tank 12 in the order of the cold water supply path R1, the air conditioner 2, the hot water return path R2, the sprinkler 13, the cooling coil 11, and the water storage tank 12. it can.
[0035]
This circulating water flows down around the remaining ice surface on the outer surface of the cooling coil at the portion where the cooling coil 11 is disposed, and melts inactive ice adhering to the outer surface of the cooling coil 11 in the flow-down process. In addition, ice floating in the water stored in the water storage tank 12 is also melted. When the remaining ice melts, the amount of circulating water increases, but this increased amount of water is discharged through the overflow path 18. This water circulation is performed until the residual ice is completely melted according to the amount of residual ice. If the remaining ice melts, the ice making water supply pump P3 (or the cold water supply pump P2 when water circulation is performed via the air conditioner 2) is stopped. If the drainage from the overflow path 18 stops, the operation is terminated. In this way, there is no residual ice in the cooling coil 11 and there is no excess or deficiency of the retained water amount. After the main operation, the ice making operation is started again.
[0036]
According to the experiments of the present inventor, the residual ice melting and the retained water reset are performed when the set temperature is 7 ° C., and at most once or twice a month. Knows that it is about 5% of the initial water content.
[0037]
<Others>
(B) In the above example, the remaining ice was melted on the condition that the measured water temperature of the water temperature measuring means 19 exceeded the set temperature during the operation using cold water, but without providing the water temperature measuring means 19, You may make it perform residual ice melting | fusing etc. as needed. In particular, the rate of increase of invalid ice and the rate of disappearance of retained water tend to be approximately constant for each device. It is also possible to obtain a period until the cooling capacity is insufficient due to the disappearance of the retained water amount, and to periodically melt the remaining ice and reset the retained water amount according to these periods.
[0038]
Further, as in the above example, if only the condition that the measured water temperature of the water temperature measuring means 19 exceeds the set temperature during the operation using cold water is a condition such as the remaining ice melting, the cooling capacity is insufficient due to a cause that cannot be solved by the remaining ice melting or the like. If this happens, the remaining ice will melt. Therefore, when the temperature is measured by the water temperature measuring means during the operation using cold water, the ice storage amount is obtained by the above-described method, and the measured water temperature by the water temperature measuring means exceeds the set temperature and the ice storage amount exceeds the predetermined amount. It is also proposed to perform the aforementioned residual ice melting. In this case, it can be detected more reliably that the remaining ice is only invalid ice during the cold water operation.
[0039]
(B) In the present invention, the location where the water temperature measuring means is disposed can be appropriately determined as long as the temperature of the water supplied from the water storage tank to the cold water utilization unit can be measured. For example, in the ice heat storage device 10 of the above example, the water temperature measuring means 19 can be provided in the vicinity of the cold water delivery portion in the water storage tank 12.
[0040]
(C) In the above example, makeup water is directly supplied to the water storage tank 12 through the makeup water channel 17. However, in the present invention, it is only necessary to supply makeup water to the water storage tank 12 from the outside. Therefore, makeup water may be indirectly supplied to the water storage tank. In the above example, makeup water may be supplied from the outside to the water storage tank 12 through the sprinkler 13, the cold water supply path R1, the hot water return path R2, the ice making water supply path R3, and the like. good.
[0041]
(D) In the above example, as the water amount adjusting means, the overflow path 18 is provided for draining the stored water when the water storage amount of the water storage tank 12 exceeds a predetermined amount, but the water storage amount adjusting means of the present invention is not limited to this. For example, as shown in FIG. 1, a drainage channel 20 is communicated with an appropriate position (for example, the lower end of the side wall or the bottom wall) of the water storage tank 12, and a drainage adjustment valve 21 is provided in the drainage channel 20, The water storage amount is obtained from the water level measurement result of the water, and when the water storage amount is equal to or greater than a predetermined amount (for example, the initial water storage amount), the drainage adjustment valve 21 is opened to discharge the stored water in the water storage tank 12 through the drainage channel 20. When the water storage amount reaches a predetermined amount, the water amount adjustment may be performed by closing the drainage adjustment valve 21.
[0042]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent a lack of cooling capacity during operation using cold water, which occurs in a falling film type ice heat storage device.
[Brief description of the drawings]
FIG. 1 is a flow diagram of an ice heat storage air conditioning system using an ice heat storage device according to the present invention.
FIG. 2 is an explanatory diagram showing the principle of measuring the amount of ice stored.
FIG. 3 is a schematic view of a conventional ice heat storage device.
FIG. 4 is a graph showing changes in ice storage amount and invalid ice amount during operation of the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ice thermal storage type | formula air conditioning system, 2 ... Air conditioner, 10 ... Ice thermal storage apparatus, 11 ... Coiled cooling coil, 12 ... Water tank, 13 ... Sprinkler, 14 ... Casing, 15 ... Refrigerator, 16 ... Water level measurement means 17 ... Supply water channel, 18 ... Overflow channel, 19 ... Water temperature measuring means, R1 ... Cold water supply channel, R2 ... Warm water return channel, R3 ... Water supply channel for ice making, P1 ... Cooling water circulation pump for ice making, P2 ... Cool water supply pump, P3 ... Water supply pump for ice making.

Claims (3)

A cooling coil and a water storage tank whose water surface is maintained below the cooling coil;
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage In an ice storage device to be circulated in the tank;
A replenishing means for supplying makeup water from the outside to the water tank, and a water temperature measuring means for measuring the temperature of the water to be supplied to the cold water utilization unit,
If the measured water temperature by the water temperature measuring means exceeds a set temperature during the cold water use operation, then supply water is supplied to the water tank by the replenishing means, and the water stored in the water tank is supplied to the cooling coil. An ice heat storage device configured to melt down the remaining ice by flowing down the remaining ice surface on the outer surface. A cooling coil and a water storage tank whose water surface is maintained below the cooling coil;
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage In an ice storage device to be circulated in the tank;
Replenishing means for supplying makeup water from the outside to the water tank;
Water storage amount adjusting means in the water tank;
Water temperature measuring means for measuring the temperature of the water supplied to the cold water utilization unit,
When there is residual ice on the outer surface of the cooling coil, supply water is supplied to the water storage tank by the replenishing means, and the water stored in the water storage tank is allowed to flow around the residual ice surface of the outer surface of the cooling coil. The residual ice is melted, and the amount of water stored in the water tank after melting is adjusted to a predetermined amount by the water storage amount adjusting means, and the water temperature measured by the water temperature measuring means is set during the cold water use operation. When the temperature is exceeded, supply water is then supplied to the water storage tank by the replenishing means, and the water stored in the water storage tank is allowed to flow around the remaining ice surface on the outer surface of the cooling coil to remove the residual ice. An ice heat storage device configured to be melted and to adjust a water storage amount in the water storage tank after melting to a predetermined amount by the water storage amount adjusting means. A cooling coil and a water storage tank whose water surface is maintained below the cooling coil;
During the ice making operation, the stored water from the water storage tank is received and cooled by the outer surface of the cooling coil, and ice is formed and stored on the outer surface of the cooling coil,
During cold water use operation, the water stored in the water tank is supplied to the cold water use section and used, and then the used water is cooled while flowing around the ice surface on the outer surface of the cooling coil, and the cooled water is stored in the water storage Using an ice storage device to circulate in the tank;
Measure the temperature of the water supplied to the cold water utilization unit during the cold water utilization operation, and when the measured water temperature exceeds a set temperature, then supply makeup water from the outside to the water tank, and An operation method of the ice heat storage device, wherein the water stored in the tank is made to flow down around the surface of the remaining ice on the outer surface of the cooling coil to melt the remaining ice.

Images