JPH07269911A - Ice-based regenerative heat source apparatus and antifreezing control - Google Patents

Abstract

PURPOSE:To prevent freeze in the heat exchanger in air-conditioning operation so as to ensure proper performance of the air conditioning by providing a means of preventing damage to the heat exchanger which is due to freeze of chilled water inside a brine-water heat exchanger at the start of the air-conditioning operation. CONSTITUTION:During air-conditioning operation heat exchange takes place between an antifreeze liquid cooled by a heat source apparatus 1 and cold water returning from the load at a brine-water heat exchanger 2. A timer function is provided to set a period of time for which to put a brine pump in forced operation. A fixed period of time in advance of the start of air conditioning and stopping the heat source apparatus 1 but leaving the heat storage mode effective, the timer function sets a brine pump 17 alone in forced operation. As a result, the water inside a regenerative tank 3 undergoes a phase change to ice by virtue of the heat capacity of the brine and the temperature of the brine increases. Moreover, the operation of the brine pump 17 causes the temperature of the brine to increase through transmission of the motive power of the brine pump 17 to the brine. Thus the chilled water inside the brine-water heat exchanger 2 can be prevented from freezing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs high density cold storage by a phase change that changes cold water into ice during periods of relatively low power demand such as nighttime power, and high density during periods of high daytime power demand. The present invention relates to an ice heat storage type heat source device for performing air conditioning by utilizing cold storage, and further relates to a freeze prevention control method for an ice heat storage type heat source device for preventing freezing of equipment in the ice heat storage type heat source device.

[0002]

2. Description of the Related Art An ice storage heat source device that uses nighttime electricity to store cold water at a high density and cools the cold water stored during the daytime for air conditioning is an efficient use of electric power. Also desirable on. Conventionally, regarding the ice heat storage type heat source device for such an air conditioner, for example, “Characteristics and Examples of Heat Pump Type Ice Heat Storage Unit (“ Air Conditioning / Sanitary Engineering ”Vol. 64, No. 7)
No.) "or" Air conditioning plan for unit type ice heat storage system "(" Air Conditioning and Refrigeration "VOL28, NO.1)
0) ”and other documents have been published and are already known.

In the prior art, as the freeze prevention control currently implemented in the ice heat storage unit, a chilled water pump start signal or a chilled water cutoff relay is provided, and if these signals are not turned on during air conditioning, the heat source device is The degree of control is such that no driving is performed.

Incidentally, there is JP-A-60-89657 as a conventional example of a system for preventing freezing of cold water in a refrigerating apparatus. This is a refrigeration system that alternately performs cold water operation and brine operation, and is intended to prevent freezing due to a failure of a solenoid valve on the cold water operation side during brine operation. That is, the solenoid valve installed at the inlet on the cold water operation side is closed during the brine operation so that the cooled refrigerant does not enter the cold water operation side. However, if a malfunction occurs in which the solenoid valve does not close and opens during brine operation, the cooled refrigerant is sent to the water cooler on the cold water operation side through the solenoid valve, and the water inside the water cooler Freezes. In order to prevent this freezing, a temperature sensor is installed in the water cooler to detect the cold water temperature, and when it reaches the set temperature at which freezing is scheduled, the compressor is stopped urgently and the cold water on the cold water operation side is also shut down. Force free operation of the pump to prevent freezing.

A conventional example relating to heat storage is Japanese Patent Laid-Open No.
There are 263724 and JP-A-4-306433.

[0006]

By the way, in such an ice heat storage type heat source device for an air conditioner, in particular, the heat source device of the ice heat storage type heat source device and the heat storage tank unit are separated from each other, and the brine piping is long and the brine ( In a system with a large heat capacity of antifreeze (for example, a system in which heat source equipment is placed on the roof and a heat storage tank unit is placed underground or above the ground), when the operation switches from heat storage (cool storage) to air conditioning (when air conditioning starts) And, there is a problem that freezing of the heat exchanger occurs during air-conditioning operation at a low brine temperature, but the above-mentioned prior art does not describe such anti-freezing, and the anti-freezing It was also not related to the antifreezing control of the ice heat storage type heat source device which is effective for.

That is, in the above-mentioned prior art, no consideration is given to the prevention of freezing immediately after the start of air conditioning and after the start of air conditioning until the brine temperature rises to 0 ° C. or higher. Therefore, immediately after the start of air conditioning. There was a risk that cold water would freeze and the brine / water heat exchanger would be damaged.

Further, Japanese Laid-Open Patent Publication No. 60-89657 relates not to a heat storage device, but to prevention of freezing due to failure of a solenoid valve, and not to freezing when switching to air conditioning.

Further, JP-A-4-263724 and JP-A-4-306433 relate to a heat storage device,
There is no description from the viewpoint of freeze prevention.

In view of the above-mentioned problems in the prior art, the present invention, in particular, does not freeze the heat exchanger during air-conditioning operation and can reliably perform air-conditioning operation, and an ice storage heat source device and its freezing. An object is to provide a prevention control method.

[0011]

In order to achieve the above object, the present invention provides a heat source device for cooling antifreeze liquid, and a brine / water heat exchanger for cooling cold water from a load by the antifreeze liquid from the heat source device. , An ice making heat exchanger that makes ice by the heat source device at night, a heat storage tank that internally stores the ice making heat exchanger to store heat, an operation of the heat source device and a flow of the antifreeze liquid from the heat source device. In the ice heat storage heat source device, which comprises a control means for controlling, and performs air conditioning by the air conditioner by utilizing high density cold storage by phase change of cold water in the heat storage tank, the brine /
There has been proposed an ice storage heat source device provided with a means for preventing damage to the heat exchanger due to freezing of cold water inside the water heat exchanger.

Further, according to the present invention, a heat source device for cooling the antifreeze liquid, a brine / water heat exchanger for cooling cold water from the load by the antifreeze liquid from the heat source device, and ice making at night by the heat source device. An ice making heat exchanger, a heat storage tank that holds an ice making heat exchanger to store heat therein, and a control means that controls the operation of the heat source device and the flow of the antifreeze liquid from the heat source device, In an ice heat storage type heat source device that performs air conditioning by utilizing high density cold storage due to phase change of cold water in a tank, at least one of antifreeze liquid supplied from the heat source device to the brine / water heat exchanger when air conditioning operation is started. There has been proposed a freeze prevention control method for an ice storage heat source device, which prevents freezing of cold water by an antifreeze solution in the brine / water heat exchanger by increasing the temperature of the section.

Further, according to the present invention, a heat source device for cooling the antifreeze liquid, a brine / water heat exchanger for cooling cold water from a load by the antifreeze liquid from the heat source device, and ice making at night by the heat source device. An ice making heat exchanger, a heat storage tank that has an ice making heat exchanger inside to store heat, control means for controlling the operation of the heat source device and the flow of the antifreeze liquid from the heat source device, and cold water from the load An ice storage heat source device, comprising: a cooling pump for supplying water to the brine / water heat exchanger, and performing air conditioning by utilizing high-density cold storage due to phase change of cold water in the heat storage tank The brine / water heat is controlled by controlling the supply of the antifreeze liquid from the heat source device to the brine / water heat exchanger according to the cold water supplied from the cooling pump to the brine / water heat exchanger. Freezing prevention control method for an ice thermal storage type heat source device that prevents cold water freezing by antifreeze in exchanger has been proposed.

[0014]

That is, according to the above-mentioned ice storage type heat source device of the present invention, means for preventing damage to the heat exchanger due to freezing of the heat exchanger during air conditioning operation, which has not been recognized in the prior art, is further provided. By providing it, the above-mentioned problems in the conventional technique are solved.

Further, according to the above-mentioned method for controlling freezing prevention of the ice heat storage type heat source device according to the present invention, particularly at least a part of the antifreeze liquid supplied from the heat source device to the brine / water heat exchanger at the start of the air conditioning operation. By increasing the temperature, the freezing of cold water from the air conditioner by the antifreeze in the brine / water heat exchanger is prevented.

Further, the above-mentioned method for controlling freezing prevention of the ice heat storage type heat source device according to the present invention, particularly at the start of the air conditioning operation, supplies the antifreeze liquid from the heat source device to the brine / water heat exchanger,
By controlling according to the cold water supplied from the cold water pump to the brine / water heat exchanger, it is possible to prevent freezing of the cold water by the antifreeze liquid in the brine / water heat exchanger.

In addition to the above-mentioned invention, in the embodiment, more specifically, in addition to the conventional cold water pump start signal or freeze prevention by a water cutoff relay, a fixed time of the air conditioning operation start time is added. Before that, the brine pump is independently operated to raise the brine temperature by the time the air conditioning starts, thereby preventing the cold water from freezing in the brine / water heat exchanger at the time of the air conditioning start.

When the chilled water pump is stopped during the air conditioning operation, a mode switching valve for switching the flow direction of brine between the brine / water heat exchanger and the ice making heat exchanger is opened on the ice making heat exchanger side, and the brine water heat exchanger is opened. It is also possible to prevent freezing of cold water in the brine / water heat exchanger by switching to side closed and preventing brine at 0 ° C. or less from flowing into the brine / water heat exchanger.

In addition, it is also possible to prevent freezing of cold water in the brine / water heat exchanger by controlling the cold water pump so that it cannot be stopped when the brine temperature is 0 ° C. or lower during air conditioning operation. It is effective in preventing freezing of cold water inside. In addition, since the ice heat storage unit cools the brine (antifreeze) to 0 ° C. or less in order to make ice in the night heat storage tank, the brine temperature during the heat storage operation is generally −
It becomes 5 to -15 ° C.

Further, according to one embodiment of the present invention, during the air conditioning operation, the brine flows into the brine / water heat exchanger for exchanging heat between the brine and the cold water, and the heat is exchanged with the cold water to cool the temperature of the cold water. However, immediately after the start of air conditioning operation, low-temperature brine during heat storage operation enters the brine / water heat exchanger, so cold water freezes in the brine / water heat exchanger and
Water heat exchanger may be destroyed. Therefore, in order to solve the above-mentioned problem, the chiller unit is stopped and the brine pump is independently operated before a predetermined time before the air conditioning operation is started. As a result, it is possible to prevent the cold brine from flowing into the brine / water heat exchanger at the start of air conditioning due to the brine heat rising due to the latent heat when the ice has a heat capacity of the brine and the power of the brine pump. , It is possible to prevent the brine / water heat exchanger from being damaged by freezing. In the control as described above, more accurate control is possible by detecting the brine temperature during the heat storage operation and determining the single forced operation time of the brine pump from this detected value.

Further, when the cold water pump is stopped during the air conditioning period, even if the brine pump is stopped, low-temperature brine flows into the brine / water heat exchanger by natural convection, and the cold water in the brine / water heat exchanger is cooled. May freeze. Therefore, when the cold water pump is stopped, the mode switching valve is switched so that the ice making heat exchanger side is opened and the brine / water heat exchanger side is closed. This can prevent low temperature brine from flowing into the brine / water heat exchanger due to natural convection, and prevent freezing of cold water.

When the heat storage operation is switched to the air-conditioning operation, the mode switching valve is switched to open the brine water heat exchanger side and close the ice making heat exchanger side, so that the brine / water heat exchanger has a low temperature brine. However, if the chilled water pump is stopped at this time, there is a high possibility of freezing. After confirming that the chilled water pump has started, control the flow direction of the brine to the brine / water heat exchanger side. This prevents low-temperature brine from flowing into the brine / water heat exchanger while the cold water pump is stopped, and prevents freezing of cold water in the brine / water heat exchanger.

As a method for preventing low-temperature brine from flowing into the brine / water heat exchanger when the cold water pump is stopped as described above, the brine temperature during air-conditioning operation is detected, and when the brine temperature is 0 ° C. or lower, This can also be achieved by controlling so that the cold water pump is not stopped.

[0024]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a basic configuration of an ice heat storage type heat source device according to the present invention. Reference numeral 1 in the figure denotes a heat source device such as a chiller unit or a refrigerator, which is used during air conditioning operation. The brine / water heat exchanger 2 exchanges heat between the antifreeze liquid cooled by the device 1 and the cold water returned from the load. Further, reference numeral 3 in the figure is a heat storage tank for storing heat generated by using nighttime electric power, and the water in the heat storage tank 3 is heated by the ice making heat exchanger 4 by using the nighttime electric power. Heat is exchanged with the low temperature brine generated by operating the device 1, and thus the heat storage tank 3
Make ice inside. Further, reference numeral 5 is a cold water pipe for guiding cold water from a load such as an air conditioner, reference numeral 6 is a sprinkling pipe for sprinkling the cold water discharged from the brine / water heat exchanger 2 in the heat storage tank 3, and reference numeral 7 is the sprinkling pipe. A control valve for controlling the amount of cold water flowing into the heat storage tank 3 for controlling the outlet temperature of the cold water sprinkled from 6 (cold water outlet temperature), reference numeral 8 is a temperature detector for detecting the cold water outlet temperature, and reference numeral 9 is temperature. A temperature controller that outputs an open / close signal to the control valve 7 based on the signal of the detector 8, and reference numeral 10 is between the heat source device 1 and the brine / water heat exchanger 2, and between the heat source device 1 and the ice making device. It is a brine pipe that connects with the heat exchanger 4.

Further, between the brine pipe 10 and the brine / water heat exchanger 2, and between the brine pipe 10 and the ice making heat exchanger 4, the flow of brine during air-conditioning operation and heat storage operation. Mode switching valve 1 for switching direction
1, 12 are provided. In addition, in the heat storage tank 3,
A water level detector 13 for detecting the water level is provided in order to estimate the heat storage amount of the heat storage amount during the heat storage operation, and the water level detector 13 is guided via the conduit 14 to the water level. In the heat storage tank 3, ice grows around the heat exchange coil and grows. The water level rises as the ice grows. Therefore, by monitoring the water level with the water level detector 13, the state of heat storage can be known. Reference numeral 15 is a temperature detector for detecting the temperature of the cold water in the heat storage tank 3, reference numeral 16 is a cold water pump, and reference numeral 17
Indicates a brine pump, reference numeral 19 indicates a brine temperature detector, and reference numeral 20 indicates a differential pressure type flow rate detector for measuring the chilled water circulation flow rate.

Further, reference numeral 18 in the drawing is a control board, and as is clear from the drawing, this control board 18 is the heat storage tank 3 described above.
The mode switching valve 1 for inputting detection signals from the water level detector 13 and the temperature detector 15 attached to the air conditioner to switch the flow direction of the brine between the air conditioning operation and the heat storage operation.
1, 12 and the operation of the heat source device 1 are controlled.

Next, a general operation of the ice heat storage type heat source device having the structure described above will be described below. First, the ice heat storage type heat source device includes a heat storage operation at night and an air conditioning operation during the day. In the heat storage operation at night, the heat source device 1 is operated (that is, as a refrigerator), the brine in the pipe 10 is cooled to 0 ° C. or lower, and the ice making heat exchanger 4 in the heat storage tank 3 is operated.
Heat is stored by changing the phase of the water in the heat storage tank 3 into ice (heat storage operation).

Usually, the heat storage operation as described above is performed during a so-called nighttime discount period (for example, 22:00 to 8:00). It is also possible to operate the heat source device 1 in a heat storage operation other than the above-mentioned nighttime discount period. In that case, the refrigerating capacity of the heat source device 1 can be reduced, so that the heat source device 1 can be downsized. It becomes possible to measure. Regarding the amount of heat stored in the heat storage tank 3, the water level detector 13 constantly measures the water level difference from the reference position (the position where the amount of heat storage is zero), and when the water level difference reaches a predetermined value, the heat storage is completed. Judge and end the heat storage operation.

On the other hand, in the cooling operation during the daytime, the heat source device 1 is operated to cool the brine to about 3 ° C., and the brine is guided to the brine / water heat exchanger 2 through the pipe 10 and returned from the load. By exchanging heat with cold water, the temperature of the cold water returning from the load is lowered. Furthermore, the control valve 7, the temperature detector 8, and the temperature controller 9 are used so that the cold water discharged through the brine / water heat exchanger 2 has a predetermined temperature (for example, 7 ° C.) at the outlet to the load. Control. The operation schedule control, the heat storage completion determination, and the like as described above are performed according to the command from the control panel 18.

Next, the freezing prevention control of the brine / water heat exchanger 2 during the air conditioning operation, which is a feature of the present invention, will be described.
The details will be described below. During the heat storage operation, the heat source device 1
Cools the brine to 0 ° C. or lower (usually −5 ° C. to −15 ° C.) and flows the brine to the ice making heat exchanger 4 in the heat storage tank 3 to perform the ice making operation in the heat storage tank 3. Therefore, the brine temperature is 0 ° C. or lower (normally −5 ° C. to −15 ° C.) at the start time of the air conditioning operation, and the air conditioning mode is switched to in this state (the mode switching valve 11 is “open” and the mode switching valve is “open”). 12 becomes "closed"),
This cold brine flows into the brine / water heat exchanger 2. Therefore, the cold water in the brine / water heat exchanger 2 may freeze and damage the exchanger.

Therefore, in addition to the conventional schedule timer function for setting the heat storage time zone and the air conditioning time zone, the control panel 18 further sets a timer function for setting the forced operation time of the brine pump. To provide.
With this timer function, the heat storage mode is set at a certain time before the air conditioning start time (usually 30 minutes to 1 hour before the air conditioning start time, but the set time may be longer or shorter depending on the system). (The mode switching valve 11 is “closed” and the mode switching valve 12 is “open”) The heat source device 1 is stopped and the brine pump 17 is forcibly operated alone. However, when the heat storage operation of the heat source device 1 is completed, only the brine pump 17 needs to be operated alone. On the other hand, when the heat storage operation is not completed, the heat source device 1 is first forcibly operated. After stopping, the brine pump 17 is operated.

As a result, the heat capacity of the brine causes the water in the heat storage tank 3 to undergo a phase change to ice, thereby raising the temperature of the brine. Further, by operating the brine pump 17, the power of the brine pump 17 is transmitted to the brine, which raises the brine temperature. Therefore,
According to the above method, since the brine temperature can be raised before the start of air conditioning, the low temperature brine does not flow into the brine / water heat exchanger 2 as it is at the start of air conditioning, but the brine whose temperature has risen is introduced. Therefore, it is possible to prevent the freezing of cold water in the brine / water heat exchanger 2.

In order to prevent the freezing of the cold water in the brine / water heat exchanger 2 more efficiently, the temperature of the brine from the heat source device 1 is detected by the brine temperature detector 19, and this detection is performed. It is effective to change the setting of the forced operation time of the brine pump 17 depending on the temperature.
That is, the brine temperature is detected by the brine temperature detector 19, the detected value is taken into the microcomputer 21 (FIG. 2) provided inside the control panel 18, and the present brine temperature is used to freeze the cold water. Calculate the time required to raise to the lowest temperature (usually -2 ° C or higher, but depending on the performance of the brine water heat exchanger, cold water may not freeze even if it is lower). Then, when the calculated time becomes equal to the time from the current time to the start of air conditioning, the single forced operation of the brine pump 17 is started.

Next, the details of the microcomputer 21 provided inside the control panel 18 will be described with reference to FIG. As shown in the figure, this microcomputer 21
U (central processing unit) 22, memory 23, CPU 22
24 for transferring data between the memory 23 and the memory 23, an input interface 25 for inputting a signal from the outside and converting it into a signal for the CPU 22, a bus 26 for transferring data between the input interface 25 and the CPU 22, CP
It is composed of an output interface 27 for converting a signal from the U22 into a signal for an external device, and a bus 28 for transferring data between the CPU 22 and the output interface 27. Furthermore, this microcomputer 21 is
Setting devices 29-1, 29-2, 2 for setting various times such as an air conditioning time period and a brine pump single forced operation time period
9-3, an input interface 30 for converting data from the various setting devices into a signal for the CPU 22, and a signal from the input interface 30 for the CPU
The memory 23 is provided with a bus 31 for transferring to the memory 22.
The input signal and the output signal are processed according to the logic of the software stored inside. According to such a method, it is possible to automatically set the operating time of the brine pump 17, rather than setting the independent forced operating time of the brine pump 17 in advance.

Further, the brine pump 17 as described above is used.
In addition to the prevention of freezing by the independent forced operation of 1, the signal indicating the operation / stop from the cold water pump 16 during the air conditioning operation of the device is input to the control panel 18 described above, and the operation signal is input from the cold water pump 16 to the control panel 18. Mode switching valve 1
When 1 and 12 are opened to the brine water heat exchanger 2 side (the mode switching valve 11 is "open" and the mode switching valve 12 is "closed"), and the stop signal of the chilled water pump 16 is input. Switching valve 11, so that the brine / water heat exchanger 2 side is closed (mode switching valve 11 is closed and mode switching valve 12 is open).
Control twelve. This makes it possible to prevent the cold brine from flowing into the brine water heat exchanger 2 by natural convection, and to prevent the cold water in the brine / water heat exchanger 2 that is stopped from freezing.

Further, the brine temperature during the air conditioning operation is detected by the brine temperature detector 19, and the brine temperature is 0 ° C.
In the following cases, by controlling the chilled water pump 16 so as not to stop even if the load is small, it is possible to realize safer control against chilled water freezing.

In addition, in order to prevent the brine / water heat exchanger 2 from freezing during the air conditioning operation, the chilled water pump 16 is activated,
After the flow rate detection value 20 exceeds a certain value, the mode switching valves 11 and 12 are set to the air conditioning mode (mode switching valve 1
It is also effective to switch 1 to “open” and the mode switching valve 12 to “closed”.

Besides the example of air conditioning, it can be applied to a low temperature warehouse and various cooling systems.

[0039]

As is clear from the above detailed description, according to the ice storage heat source device for an air conditioner and the antifreezing control method thereof of the present invention, the low temperature brine is a brine water heat exchanger at the start of the air conditioning operation. Prevention of freezing of cold water in the brine water heat exchanger due to the inflow of water to the air conditioner, ensuring the start operation of the air conditioner using the ice heat storage type heat source device that enables effective use of electric power, and realizing such an air conditioner It also has a technically excellent effect of promoting to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of an ice heat storage type heat source device for an air conditioner according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration of a microcomputer constituting a control panel which is a part of the ice heat storage type heat source device.

[Explanation of symbols]

 1 Heat Source Equipment 2 Brine / Heat Exchanger 3 Heat Storage Tank 4 Ice Making Heat Exchanger 5 Chilled Water Pipe 6 Sprinkling Pipe 7 Chilled Water Temperature Control Valve 8 Chilled Water Outlet Temperature Detector 9 Chilled Water Outlet Temperature Controller 10 Brine Pipe 11, 12 Mode Switching Valve 13 Water Level Detector 14 Water Level Detector Conduit 15 Heat Storage Tank Temperature Detector 16 Chilled Water Pump 17 Brine Pump 18 Control Panel 19 Brine Temperature Detector 20 Differential Pressure Flow Detector 21 Microcomputer 22 CPU 23 Memory 24 Bus 25 Input Interface 26 Bus 27 Output Interface 28, 31 Bus 29 Setting device 30 Input interface

Claims (14)

[Claims] 1. A heat source device for cooling an antifreeze liquid, a brine / water heat exchanger for cooling cold water from a load by the antifreeze liquid from the heat source device, and an ice making heat exchanger for making ice at night by the heat source device, A heat storage tank that holds this ice making heat exchanger to store heat therein, and a control means that controls the operation of the heat source device and the flow of the antifreeze from the heat source device, and the cold water in the heat storage tank An ice storage heat source device for air conditioning using high density cold storage due to phase change, comprising means for preventing damage to the heat exchanger due to cold water freezing inside the brine / water heat exchanger at the start of air conditioning operation. An ice storage type heat source device characterized in that 2. The ice storage heat source device according to claim 1, wherein the control means has a timer function of stopping the heat source device a predetermined time before an air conditioning operation start time. An ice storage heat source device for an air conditioner. 3. The ice storage heat source device according to claim 1, wherein the heat exchanger damage prevention means includes means for increasing the temperature of the antifreeze liquid from the heat source equipment. Heat storage type heat source device. 4. The ice storage heat source device according to claim 3, wherein the antifreeze liquid temperature raising means of the heat exchanger damage prevention means transfers the antifreeze liquid from the heat source equipment to the ice making heat exchanger of the heat storage tank. An ice storage heat source device characterized by including a brine pump for guiding. 5. The ice storage heat source device according to claim 4, wherein the control means has a timer function of stopping the heat source device a predetermined time before the air conditioning operation start time, and the brine pump alone. An ice storage type heat source device characterized by having a function of forced operation. 6. The ice storage heat source device according to claim 5, further comprising means for detecting the temperature of the antifreeze liquid from the heat source device, wherein the control means detects the temperature from the antifreeze liquid temperature detecting means. An ice storage heat source device comprising: a calculation unit that calculates an operating time for which the brine pump is forcibly operated independently based on the above. 7. The ice storage heat source device according to claim 4, further comprising a cold water pump for supplying cold water from the load to the brine / water heat exchanger,
A mode switching valve is provided in the inlet / outlet pipe of the brine / water heat exchanger, and the control means has a function of forcibly closing the mode switching valve when the chilled water pump is stopped after the start of air conditioning operation. An ice heat storage type heat source device having. 8. The ice storage heat source device according to claim 6, further comprising a chilled water pump that supplies chilled water from the load to the brine / water heat exchanger, and the control means includes the antifreeze temperature. An ice storage heat source device comprising a function of not stopping the chilled water pump when the temperature of the antifreeze liquid detected by the detection means is equal to or lower than a predetermined temperature. 9. The ice storage heat source device according to claim 4, further comprising a cold water pump for supplying cold water from the load to the brine / water heat exchanger, and the brine / water heat by the cold water pump. A means for detecting the flow rate of cold water to the exchanger is provided, and a mode switching valve is provided at the inlet / outlet piping of the brine / water heat exchanger, and the control means is provided with the cold water flow rate detected by the cold water flow rate detecting means. The ice storage heat source device is characterized in that the mode switching valve is switched after the temperature exceeds a predetermined value. 10. A heat source device for cooling an antifreeze liquid, a brine / water heat exchanger for cooling cold water from a load by the antifreeze liquid from the heat source device, and an ice making heat exchanger for making ice at night by the heat source device, A heat storage tank that holds this ice making heat exchanger to store heat therein, and a control means that controls the operation of the heat source device and the flow of the antifreeze from the heat source device, and the cold water in the heat storage tank In an ice storage heat source device that performs air conditioning by the air conditioner by utilizing high-density cold storage due to a phase change, at least a part of the antifreeze liquid supplied from the heat source device to the brine / water heat exchanger when the air conditioning operation is started. A method for preventing freezing of an ice storage heat source device, characterized in that freezing of cold water due to an antifreeze in the brine / water heat exchanger is prevented by increasing the temperature of the above. 11. The freeze prevention control method for an ice heat storage type heat source device according to claim 10, wherein the operation of the heat source device is stopped before the air conditioning operation start time to supply the brine / water heat exchanger. A method for controlling freezing of an ice storage heat source device, which comprises raising the temperature of at least a part of the antifreeze liquid. 12. The method for controlling freeze prevention of an ice storage heat source device according to claim 11, wherein heat exchange with cold water in the heat storage tank is used to raise the temperature of at least a part of the antifreeze liquid. An antifreezing control method for an ice storage type heat source device, characterized by: 13. The method for controlling freeze prevention of an ice storage heat source device according to claim 12, wherein at least a part of the temperature of the antifreeze liquid is increased by utilizing a temperature increase due to transmission of power of a pump mechanism. Freezing prevention control method for ice storage type heat source device. 14. A heat source device for cooling antifreeze liquid, a brine / water heat exchanger for cooling cold water from a load by the antifreeze liquid from said heat source device, and an ice making heat exchanger for making ice at night by said heat source device, A heat storage tank that holds the ice making heat exchanger to store heat therein, a control unit that controls the operation of the heat source device and the flow of the antifreeze liquid from the heat source device, and the cold water to the brine / water heat exchanger. An ice heat storage type heat source device comprising: a cooling pump for supplying air to the heat storage tank to perform air conditioning by utilizing high density cold storage due to a phase change of cold water in the heat storage tank; By controlling the supply of the antifreeze liquid to the water heat exchanger according to the cold water supplied from the cooling pump to the brine / water heat exchanger, cooling by the antifreeze liquid in the brine / water heat exchanger is performed. A method for preventing freezing of an ice storage heat source device, characterized by preventing freezing of water.