JP3852630B2 - Ice storage type cold water production system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice storage type cold water manufacturing apparatus capable of storing ice.
[0002]
[Prior art]
An ice heat storage system that uses ice at low cost late-night power to make ice in a heat storage tank and uses the latent heat when ice melts at the peak of cooling during the daytime is used. By performing ice heat storage, the conventional water heat storage is sensible heat storage, whereas the latent heat storage accompanying the phase change between the solid and the liquid can be used, and there is an 80 times difference compared to the water heat storage. The heat storage capacity of ice can be used. In addition, ice is an excellent heat storage material because it is cheaper and chemically stable than other heat storage materials. Therefore, ice heat storage enables large-scale heat storage with a small heat storage tank capacity by adding ice melting latent heat to general water heat storage utilizing water sensible heat. Moreover, since the volume of the heat storage tank is reduced, the surface area is also reduced, thereby reducing heat loss. Furthermore, since a relatively low temperature cold water of about 4 ° C. can be obtained in the heat storage tank, the pipe diameter of the cold water is reduced, and an ice heat storage system capable of supplying a large amount of cold water can be realized.
[0003]
When generating ice in an ice heat storage system, the generated ice grows by icing on the tube wall of the heat exchanger, etc., and the ice growth increases as the thickness of the icing increases due to the low thermal conductivity of the ice. The speed will drop. Therefore, the ice on the wall surface is peeled off and floated by regular heating, and the peeled ice is accumulated in the upper part of the heat storage tank. However, when the ice produced in the heat storage tank is full, even if heated, the ice does not peel off from the wall surface and remains attached. For this reason, ice making efficiency deteriorates, and the ice heat storage system continues to be uselessly operated. In order to prevent such a situation, the ice heat storage system is provided with a device for detecting the amount of ice accumulated in the heat storage tank, and when the ice cannot be deiced due to the stored ice, the heat exchanger system The operation is stopped.
[0004]
[Problems to be solved by the invention]
As a system for detecting the amount of ice stored, a sensor with multiple electrodes has been installed near the bottom of the heat storage tank, and whether or not ice has been stored near the bottom by the current flowing between these electrodes. A system for judging the above is adopted. Since the electrical conductivity of ice is very small compared to water, the current that flows is reduced if ice is present between the electrodes. Therefore, it is possible to determine whether or not ice has been stored up to the vicinity of the bottom surface of the heat storage tank by detecting the current flowing between the electrodes using such a system.
[0005]
However, when foreign matter such as chalk adheres to electrodes arranged in water, the amount of current flowing between the electrodes fluctuates, so that stable sensitivity cannot always be maintained. Therefore, it is necessary to frequently inspect and maintain the sensor or to strictly control the quality of water supplied to the heat storage tank. Moreover, since such a sensor is arrange | positioned in a thermal storage tank, washing | cleaning in a thermal storage tank is difficult, and especially dirt tends to accumulate in the sensor vicinity. As a result, the water quality of the cold water supplied from the ice heat storage system deteriorates, and the sensor electrode becomes dirty and the sensitivity becomes unstable. Furthermore, since it is necessary to connect the sensor arranged in the heat storage tank and the control device arranged outside the heat storage tank, it is necessary to penetrate the heat storage tank with a cable, etc. It takes time and the penetrating part is likely to cause leaks.
[0006]
Then, in this invention, since there is no detection apparatus in a thermal storage tank, it aims at providing the ice storage type cold water manufacturing apparatus which is hygienic and easy to wash | clean. In addition, by making it possible to detect the state of ice accumulation outside the heat storage tank, stable control can be performed, sensor maintenance is not required, and a heat storage tank with a simple structure is used to provide highly reliable storage. Another object of the present invention is to provide an ice-type cold water production apparatus at a low cost. It is another object of the present invention to provide an ice storage type cold water manufacturing apparatus that can detect the amount of ice storage reliably, prevent wasteful operation of the ice storage system, perform optimal control, and reduce running costs. .
[0007]
[Means for Solving the Problems]
The inventors of the present application have examined in detail the changes in the temperature of each part of the ice making device, and when the ice grows and reaches a position away from the cooling means, the temperature of the cooling wall at that position gradually decreases. It was seen. This is presumably because that part of the cooling wall is gradually cooled by the cooling means because it is covered with ice having low thermal conductivity. Therefore, in an ice making device having a heat conductive cooling wall in contact with both the aqueous solution and the cooling means capable of cooling the aqueous solution to at least the freezing point, by detecting the temperature of the cooling wall at a position away from the cooling means. It was found that the presence or absence of ice in the vicinity of the position can be determined. For this reason, by providing a control means for stopping the cooling means when the temperature of the cooling wall away from the cooling means falls below the set value, it is possible to detect the state where ice that has iced on the cooling wall has grown too much and It becomes possible to control the means. Therefore, the ice making device can be controlled by a control method including the following steps.
[0008]
1. A first step of detecting the temperature of the thermally conductive cooling wall in contact with both the aqueous solution and the cooling means at a position away from the cooling means
2. A second step of stopping the cooling of the aqueous solution when the detected temperature falls below a set value;
[0009]
In such a control means and control method, it is only necessary to be able to detect the temperature of the cooling wall, and therefore it can be provided to detect the temperature of the surface of the cooling wall opposite to the surface in contact with the aqueous solution. Therefore, the presence or absence of ice can be determined without arranging a sensor on the aqueous solution side of the cooling wall. Further, considering that the temperature of the cooling wall is lowered by the cooling means, it is possible to make a more sensitive determination by detecting the temperature at a position at least about 10 mm away from the cooling means.
[0010]
Therefore, the ice storage type cold water production apparatus of the present invention comprises a heat storage tank capable of holding water and ice, a heat conductive cooling wall formed on the bottom wall of the heat storage tank, and water or ice in the cooling wall. A cooling means for cooling from the back side opposite to the surface to be heated, a heating means for heating the cooling wall, and a temperature at a position in the non-ice-making region away from the cooling means on the back surface of the cooling wall. And a control means for controlling the cooling means and the heating means based on a temperature change detected by the temperature sensor.
[0011]
In the ice storage type cold water production apparatus of the present invention, neither cooling means nor detection means is arranged in the heat storage tank, so it is hygienic and easy to clean. Furthermore, since the ice making state can be detected from the outside of the heat storage tank, maintenance of the detecting means is not required and control with very stable sensitivity can be performed.
[0012]
The ice storage type cold water manufacturing apparatus of the present invention includes a heating unit that heats the cooling wall alternately with the cooling unit, and performs control to switch and operate the cooling unit and the heating unit according to the temperature change detected by the temperature sensor. be able to. In addition, when the ice is accumulated in the heat storage tank and the ice cannot be deiced from the cooling wall, and the icing on the cooling wall continues to grow, the temperature detected by the temperature sensor decreases. Therefore, by controlling the operation of the cooling means and the heating means according to the temperature change, useless cooling and heating can be prevented and the running cost can be reduced.
[0013]
Also in the ice storage type cold water production apparatus of the present invention, in order to prevent the influence of the cooling means and the heating means and obtain higher sensitivity, the detection means detects the temperature at a position at least about 10 mm away from the cooling means. It is desirable to install in. Also, when the cooling means is arranged facing a plurality of regions of the cooling wall, the temperature sensor is generated in the plurality of regions by arranging the temperature sensor so as to detect the temperature of the cooling wall between the plurality of regions. It is possible to judge the growth state of ice. Further, when the cooling means is arranged facing the annular region of the cooling wall, it is desirable to arrange the temperature sensor so as to detect the temperature of the cooling wall substantially at the center of the annular region.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a schematic configuration of an ice storage type cold water production apparatus which is an example of the present invention. The ice storage type cold water production apparatus 1 of this example includes a heat storage tank 10 that can hold water 7 and ice 8, and the cold water 7 manufactured in the heat storage tank 10 is supplied to an external user, for example, an air conditioning system or a food product. A cooling water supply pump 5 supplies the cooling device or the like. In the heat storage tank 10, an ice making device 20 is mounted on the bottom wall 11, and the periphery of the bottom wall 11 and the side wall 12 is covered with a heat insulating material 13 so that the ice 8 and cold water 7 generated by the ice making device 20 can be held. It has been broken. In the heat storage tank 10 of this example, the bottom wall 11 is a metallic cooling wall with good thermal conductivity, and the ice making device 20 is provided on the back side of the cooling wall 11, that is, the water 7 or ice on the cooling wall 11. 8 is disposed to face the back surface 11b opposite to the front surface 11a.
[0015]
The ice making device 20 of this example is in contact with the back surface 11b of the cooling wall 11 and has an evaporator (evaporator) 21 that cools the cooling wall 30 from the outside and a cooling system that includes a cooling unit 31 that supplies refrigerant to the evaporator 21. A heating system including a heater 22 that heats the cooling wall from the back surface 11b side of the cooling wall 11 and a heating unit 32 that supplies power to the heater to control the heating system, and a control unit 33 that controls the cooling system and the heating system are provided. ing. The evaporator 21 and the heater 22 are divided into two sections 21a, 21b, 22a and 22b, and two ice making regions 25a and 25b can be formed on the bottom wall 11. Further, a temperature sensor 23 is mounted on the back surface 11b of the cooling wall 11 at a position slightly apart from both the ice making regions 25a and 25b and between the ice making regions 25a and 25b (non-ice making region). The sensor 23 can detect the water temperature inside the heat storage tank 10 through the cooling wall 11. Therefore, the control unit 33 can take in the output of the sensor 23 and perform various controls on the cooling unit 31 or the heating unit 32. For example, in the ice storage type cold water production apparatus 1 of this example, the cooling system and the heating system are switched by a timer to make ice, and the ice produced in this process almost fills the heat storage tank 10. The ice making process can be stopped by detecting, with the temperature sensor 23, the state where the ice making is completed and the ice making is completed.
[0016]
FIG. 2 shows the heat storage tank 10 as viewed from above. As shown in this figure, two ice making regions 25a and 25b are configured on the bottom surface 11a of the heat storage tank 10 by two evaporators 21a and 21b and two heaters 22a and 22b arranged on the back surface side. And the temperature sensor 23 is arrange | positioned in the non-ice-making area | region 26 where neither the evaporator 21 nor the heater 22 is arrange | positioned between these ice-making area | regions 25a and 25b. The distance between these two ice making regions 25a and 25b is about 60 to 100 mm in the apparatus of the present example, and the temperature sensor 23 is disposed at a substantially intermediate position. Therefore, the temperature sensor 23 is installed at a position away from one ice making region by a distance X (about 30 to 50 mm). Of course, the interval between the ice making regions 25a and 25b is not limited to the above value. Further, although the arrangement of the temperature sensor 23 is not limited to this position, as will be described later, in order to determine the presence or absence of ice by the temperature sensor 23, it is separated from the ice making region 25 to some extent, for example, about 10 mm or more. It is desirable to arrange it at a position.
[0017]
FIG. 3 schematically shows how the ice making unit 20 generates ice inside the heat storage tank 10. FIG. 4 shows the temperature change detected by the temperature sensor 23 during the ice making process. Assuming that the water temperature in the heat storage tank 10 is near 0 ° C. at time t0 and the conditions for making ice are ready, the evaporator 21 of the cooling system and the heater 32 of the heating system are moved alternately in the two ice making regions 25a and 25b. Ice 8 is produced. Then, as shown in FIG. 3A, when the ice 8 has an appropriate size, the ice 8 is peeled off from the bottom surface 11a and floats above the heat storage tank 10 to be stored in ice. During this time, there is almost no temperature change detected by the temperature sensor 23 located away from the evaporator 21 (ice-making region 25), and the water temperature is moved slightly up and down by the influence of the evaporator 21 and the heater 22 in the vicinity of 0 ° C.
[0018]
When this ice storage process is continued, the ice 8 is accumulated up to the vicinity of the bottom surface 11 of the heat storage tank 10 as shown in FIG. As a result, even if the heater 22 is operated, the ice 8 is not deiced, but the next process of cooling by the evaporator 21 is started, and the ice 8 gradually grows while icing on the bottom wall 11. For this reason, the ice 8 spreads from the ice making areas 25a and 25b to the left and right non-ice making areas 26 along the bottom surface 11a, and further grows in a state where the ice 8 in the respective areas 5a and 25b come into contact with each other. . Of course, depending on the ice making capacity of the ice storage type cold water production apparatus 1, for example, in the ice storage type cold water production apparatus 1 for making ice by repeating the cycle of operating the heating system for 15 minutes after operating the cooling system for 1 hour, After the completion of the ice storage in which the ice is almost full in the heat storage tank 10, that is, about 3 to 4 hours after the ice cannot be removed, the ice 8 grown from both sides is about 60 to 100 mm in non-ice making. Region 26 is covered.
[0019]
The temperature change detected by the temperature sensor 23 located away from the ice making region 25 during this time is as shown in FIG. 4, and when the ice cannot be removed at time t1, the temperature gradually decreases. When the positioned non-ice-making region 26 is almost covered with ice, it is stabilized at a temperature lower than time t0. Such a change can be explained as follows. First, in the state where deicing is repeated before time t1, the surface (bottom surface) 11a of the cooling wall 11 on which the temperature sensor 23 is located is in contact with the cold water 7 in the heat storage tank 10, so the temperature sensor 23 detects the water temperature. Has been. When the ice cannot be removed at time t1 and the surface of the cooling wall 11 where the temperature sensor 23 is located is covered with ice, the ice itself is gradually insulated from the cold water 7 because of its very low thermal conductivity, The region of the cooling wall 11 where the temperature sensor 23 is located is also cooled by the evaporator 21. As a result, the temperature of the temperature sensor 23 gradually decreases. Therefore, it is determined whether or not the surface of the cooling wall (bottom wall) 11 at a position away from the ice making region is covered with a certain amount of ice by setting an appropriate temperature lower than the water temperature, for example, about −3 ° C. as the set temperature. can do. In addition, such a state corresponds to a state in which ice storage that cannot be deiced is completed, so that the cooling system and the heating system are stopped when the temperature of the temperature sensor 23 reaches a set value (for example, −3 ° C.). Control can be performed. Further, since the size of the ice generated in the cooling system can be determined using the temperature sensor 23, it is detected that ice of an appropriate size has been generated, and the ice is switched to the heating system for deicing. Such control is also possible.
[0020]
When the cooling system and the heating system are stopped, the cold water generated in the heat storage tank 10 is supplied to the user, and when the water is supplied to the heat storage tank 10, the ice 8 becomes insufficient, so that the icing surface rises. As a result, since the ice on the surface 11a of the cooling wall 11 where the temperature sensor 23 is installed peels off at time t3 and the water temperature can be detected, the temperature of the temperature sensor 23 also rises. Therefore, for example, when the temperature of the temperature sensor 23 reaches 0 ° C., it is possible to perform control such that the cooling system and the heating system are brought into operation again and the ice making process is restarted.
[0021]
FIG. 5 shows an example of processing of the control unit of this example using a flowchart. In this example, a process of cooling to make ice using a cooling system including the evaporator 21 and the cooling unit 31, and a process of peeling ice using a heating system including the heater 22 and the heating unit 32, Switching is controlled using a cooling timer CT and a heating timer HT, respectively. First, in step ST1, the cooling timer CT and the heating timer HT are reset to zero. Next, in step ST2, the value detected by the temperature sensor 23 is compared with the set value, and the water temperature is detected if the temperature is higher than the set value (-3 ° C. in this example), that is, the temperature sensor 23. Since the surface side 11a of the cooling wall 11 to which is attached is not covered with ice, the process proceeds to step ST3 to start the ice making process.
[0022]
In the ice making process, first, in step 3, the values of the cooling timer CT and the heating timer HT are confirmed. If both are 0, the cooling process is started, so the cooling timer CT is started in step ST4. In step ST6, cooling is started. And it returns to step ST2 and detects sensor temperature. On the other hand, if the cooling timer CT is operating, it is confirmed in step ST5 whether it is within the cooling period T1, and if it is within the cooling period T1, cooling is continued in step ST6.
[0023]
If the cooling period T1 has passed in step ST5, the ice 8 having an appropriate thickness has been formed in the ice making region. Therefore, in step ST7, the value of the heating timer HT is confirmed. If the heating timer HT is 0, heating is performed. Start the process. For this reason, the heating timer HT is started in step ST8, and heating is started in step ST10. And it returns to step ST2 and detects sensor temperature. If the heating timer HT is operating, it is confirmed in step ST9 whether or not it is within the heating period T2, and if it is within the heating period T2, heating is continued in step ST10. On the other hand, when the heating period T2 has passed, the cooling process and the heating process have been completed, and the ice 8 formed in the ice making region has been peeled off, and since one cycle of the ice making process has been completed, the process returns to step ST1. To reset the cooling timer CT and the heating timer HT.
[0024]
On the other hand, in step ST2, the temperature of the temperature sensor 23 is lower than the set value, and the surface side 11a of the cooling wall 11 where the temperature sensor 23 is installed is covered with ice. Therefore, it can be assumed that the ice storage progresses and the heat storage tank 10 is filled with ice 8 and there is no space for new ice to rise. For this reason, it transfers to step ST11 and stops a cooling and a heating process. Then, after resetting the timers CT and HT, the process returns to step ST2 to check the status of the temperature sensor 23.
[0025]
As described above, the ice storage type cold water production apparatus 1 of the present example includes the ice making device 20 using the bottom wall 11 of the heat storage tank 10 as a cooling wall, and is provided on the back surface 11 b side of the bottom wall 11 of the heat storage tank 10. The ice storage state can be determined by the temperature change of the temperature sensor 23, and the cooling system and the heating system can be turned on and off by the temperature sensor 23. Therefore, useless power consumption can be reduced by stopping the cooling system and the heating system in a state where ice storage is completed. Furthermore, in this example, since such control can be performed using the temperature sensor 23 provided on the back surface side 11b of the bottom wall 11, a control system in which the amount of ice is detected by conventional electrical conductivity. Unlike the sensor, there is no concern that the sensor will be contaminated with chlora or other impurities contained in the water in the heat storage tank and the sensitivity will be reduced, and highly reliable control is possible. Moreover, since the temperature sensor 23 is not immersed in water but is installed on the back surface side 11b of the bottom wall 11, that is, outside, no measures such as leakage or waterproofing are required and an inexpensive one should be adopted. Can do. Furthermore, since the temperature sensor 23 may be provided outside the bottom wall 11, wiring and attachment to the temperature sensor 23 are easy. For this reason, it is not necessary to employ a wiring configuration that is troublesome and causes water leakage because the wiring penetrates the bottom wall or the wiring is installed in the tank. Further, the temperature sensor can be easily maintained and replaced regardless of whether the heat storage tank 10 has water. Thus, since the ice storage type cold water manufacturing apparatus 1 of this example can install the temperature sensor outside the cooling wall and can grasp the state of ice, the configuration of the heat storage tank 10 becomes very simple, An ice storage type cold water production apparatus that is highly reliable and easy to use can be provided at low cost.
[0026]
Further, in the ice storage type cold water production apparatus 1 of this example, not only the temperature sensor 23 but also the evaporator 21 and the heater 22 are arranged on the back side 11 b of the bottom wall 11 of the heat storage tank 10. Therefore, there are no protrusions inside the heat storage tank 10, and it is very easy to clean and can always be managed hygienically. For this reason, it is suitable not only for industrial use such as air conditioning, but also for supplying cold water in business handling food. And since unnecessary power consumption can be prevented by the control using the temperature sensor 23, the running cost is low, and safe and cold water can be supplied at low cost by the ice storage type cold water producing apparatus 1 of this example.
[0027]
In the control using the temperature sensor of the present invention, the presence or absence of ice on the surface side of the cooling wall such as the bottom wall is detected by the temperature change on the back surface side. Of course, it can be used not only for determining whether or not it has been completed, but also for other controls. For example, FIG. 6 shows an example in which the above temperature sensor is used for switching between the cooling process and the heating process. In this example, in each ice making cycle, first, in step ST21, the value of the temperature sensor is compared with a set value (for example, −3 ° C. as described above), and the value of the temperature sensor becomes higher than the set value. For example, since ice has not yet been formed on the opposite surface of the temperature sensor, the process proceeds to step ST22, and cooling is continued to freeze the water in the heat storage tank. On the other hand, in step ST21, if the value of the temperature sensor becomes equal to or lower than the set value, ice is formed up to the opposite surface of the temperature sensor, so the process moves to step ST23 to switch to the heating process, and the ice is peeled off. When the peeling is completed, the opposite surface of the temperature sensor comes into contact with water again, so that the value of the temperature sensor rises, thereby restarting the cooling process in step ST22. In this manner, cooling and heating can be repeated, and the ice 8 can be efficiently stored in the heat storage tank 10.
[0028]
Moreover, although the ice storage type cold water manufacturing apparatus 1 of this example has attached the temperature sensor 23 in the middle of the ice-making area | regions 25a and 25b divided into two, the attachment position of the temperature sensor 23 is also limited to this example. It is not a thing. For example, a temperature sensor 23 may be installed between one ice making region 25a and the side wall 12 of the heat storage tank, as shown in FIG. The distance Y between the temperature sensor 23 and the ice making region 25a, that is, the evaporator 21, can be changed according to the size of ice to be detected by the temperature sensor 23, and can be set to about 10 to 40 mm, for example. However, if the temperature sensor 23 is close to the evaporator 21 or the heater 22, the temperature is likely to change due to the thermal influence from them, so it is desirable to ensure a certain distance. According to the measurement by the inventors of the present application, sufficient sensitivity can be obtained by ensuring a minimum distance of about 10 mm between the evaporator 21 and the bottom wall 11 by the temperature change detected by the temperature sensor 23. It can be determined whether or not there is ice on the surface side (bottom surface) 11a. On the other hand, in the case of the arrangement as shown in FIG. 2, since it is affected by the heat of the ice making regions 25a and 25b on both sides, it is desirable to secure a slightly longer distance X between the ice making region and the temperature sensor, about 30 to 50 mm. It is desirable to make it. In addition, as shown in FIG. 2, when a temperature sensor is installed between the two ice making regions 25a and 25b, the thickness of ice grown from both sides is reflected in the temperature change, so the rate of temperature change increases and the ice temperature increases. The state is easy to judge. There is also an advantage that the state of the ice making regions on both sides can be managed by one temperature sensor.
[0029]
FIG. 8 shows a further arrangement of the ice making regions 25. In this arrangement, the ice making area 25 is arranged almost on the entire bottom surface 11a, and a substantially circular non-ice making area 26 is formed at the center thereof. A temperature sensor 23 is installed on the back side of the center of the non-ice-making region 26. As in the example shown in FIG. 2, since an annular ice making region 25 is provided around the temperature sensor 23, the distance Y between the temperature sensor 23 and the ice making region 25 is set in consideration of the influence from an evaporator or the like. It is desirable to set to about 20 to 60 mm. Therefore, for example, the non-ice-making region 26 having a radius of about 20 to 60 mm may be provided in the ice-making region 25, and the temperature sensor 23 may be installed on the substantially back side of the center.
[0030]
FIG. 9 shows a further different arrangement of the ice making regions 25. In this arrangement, the ice making area 25 is arranged almost on the entire bottom surface 11 a, and the temperature sensor 23 is arranged between the ice making area 25 and the side surface 12. The distance Y between the temperature sensor 23 and the ice making region 25 is preferably set to 10 to 40 mm, as in the example shown in FIG.
[0031]
【The invention's effect】
As described above, the ice storage type cold water production apparatus of the present invention is slightly separated from the cooling means of the cooling wall such as the bottom wall of the heat storage tank whose surface is in contact with the cold water and whose back surface is in contact with the cooling means such as an evaporator. By detecting the temperature of the portion with a temperature sensor provided on the back surface opposite to the cold water, it is possible to determine whether or not ice has adhered to the surface. For this reason, when the cooling means or other control is performed depending on the presence or absence of ice, the output of the temperature sensor can be used, and the temperature sensor can determine whether or not ice storage is complete. . Thus, according to the present invention, it is possible to grasp the state of ice with a temperature sensor installed outside the heat storage tank. Therefore, it is possible to provide a very hygienic ice storage type cold water production apparatus, and supply cold water that can be used safely for food processing and the like from the ice storage type cold water production apparatus. Moreover, since the cooling unit and the heating unit can be stopped by judging the ice storage state by the temperature sensor, it is possible to prevent wasteful power consumption. And since it is not necessary to immerse the temperature sensor used for control in water, reliable control can be performed using an inexpensive and highly durable sensor. In addition, since the presence or absence of ice is determined based on the temperature change, a stable result can be obtained and almost no malfunction is observed. Therefore, according to the present invention, it is possible to provide an ice storage type cold water manufacturing apparatus that is inexpensive and highly reliable, and further saves power.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a schematic configuration of an ice storage type cold water producing apparatus according to an embodiment of the present invention.
FIG. 2 is a view of the bottom surface of the heat storage tank of the ice storage type cold water production apparatus shown in FIG. 1 as viewed from above, and is a view showing the arrangement of ice making regions and temperature sensors.
3 is a diagram showing how ice is generated in the ice storage type cold water production apparatus shown in FIG. 1. FIG. 3 (a) shows a state where ice making is continuously performed, and FIG. ) Indicates that ice storage is completed and ice cannot grow and ice is growing.
4 is a graph showing temperature changes detected by a temperature sensor in the ice making process shown in FIG. 3. FIG.
FIG. 5 is a flowchart showing an example of control of the ice storage type cold water producing apparatus shown in FIG. 1;
6 is a flowchart showing an example different from the control method shown in FIG.
7 is a view showing an example of attachment of a temperature sensor different from FIG. 2; FIG.
FIG. 8 is a view showing another example of attaching a temperature sensor.
FIG. 9 is a view showing another example of attaching a temperature sensor.
[Explanation of symbols]
1. Ice storage type cold water production equipment
10. Heat storage tank
11. Bottom wall (cooling wall)
11a ··· Surface of bottom wall (bottom surface of heat storage tank)
11b ... Back of the bottom wall
12. Side of heat storage tank
13. Heat insulation wall
20 .. Ice making equipment
21. ・ Evaporator
22. Heater
23. Temperature sensor
25 ... Ice making area
26..Non-ice-making area
31 ... Cooling unit
32 ... Heating unit
33 .. Control unit

Claims (3)

A heat storage tank capable of holding water and ice;
A heat conductive cooling wall formed on the bottom wall of the heat storage tank;
Cooling means for cooling from the back side opposite to the surface in contact with water or ice in the cooling wall;
Heating means for heating the cooling wall;
A temperature sensor for detecting a temperature at a position in a non-ice-making region away from the cooling means on the back surface of the cooling wall;
An ice storage type cold water manufacturing apparatus, comprising: a control unit that controls the cooling unit and the heating unit based on a temperature change detected by the temperature sensor. In claim 1,
The control means stops both the cooling means and the heating means when the temperature detected by the temperature sensor has dropped to a first preset value set in advance. apparatus. In claim 2,
When the temperature detected by the temperature sensor rises to a second set value higher than the first set value after stopping both the cooling means and the heating means, the control means Regenerating an ice making process comprising: a process of cooling the cooling wall using a heating means; and a process of peeling ice formed on the surface of the cooling wall using the heating means. apparatus.

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