JP2002031377A - Ice heat storage method and device using cold sensible heat - Google Patents

Abstract

(57) [Problem] To provide an optimum heat storage capacity for an actual load by setting an operation cooling temperature corresponding to an actual load size, and to cope with a large load even with a small capacity. In addition, when the load is small, an ice heat storage method and an ice heat storage device using cold and sensible heat that can improve the thermal efficiency by performing the heat storage operation at 0 ° C. or more and reduce the operating cost are provided. I do. SOLUTION: Only when a load in a building is at a peak, the cold heat generating device 1 performs a supercooling operation and stores heat in an ice heat storage tank 8 via a supercooled heat transfer medium.
By dissipating the cold and sensible heat from the building, it is possible to obtain the optimal heat storage capacity for the actual load by setting the operating cooling temperature corresponding to the actual load in the building, By using this, it is possible to cope with a large load even with a small capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage method utilizing cold and sensible heat, and more particularly to a method of designing a small heat storage capacity of an ice heat storage tank and performing supercooling operation of a cold heat generating device when a load is at a peak. The heat storage capacity suitable for the load can be set. On the other hand, when the load is small,
The present invention relates to an ice heat storage method for storing and radiating only cold sensible heat of at least ℃.

[0002]

2. Description of the Related Art As is well known, a heat storage method using a latent heat storage material has a large heat storage density and a considerable amount of heat can be obtained as compared with a sensible heat utilization technique, and the apparatus can be compact. For some reason, it has recently attracted attention. Therefore, latent heat storage materials, heat storage tanks using the same, and latent heat storage methods, devices and systems using the same have been developed, and proposals focusing on latent heat storage materials especially for heat of the sun and the like have been developed. Has been made.

For example, as shown in FIG. 11, a heat storage mode in which a heat transfer medium that has exited a compressor A and a condenser B passes through a heat storage tank C and is circulated again, A regenerative cooling device that enables a heat dissipation mode to circulate between the air coolers D is known.

[0004] Although this is a very effective technique, in this conventional technique, in the heat dissipation mode, the entire amount of the heat transfer medium that always exits the air cooler D passes through the heat storage tank C, and is again returned to the air cooler D. It is a simple structure that is returned to the equipment, and there is no special contrivance to control and supply the heat transfer medium of the temperature that matches the conditions to the equipment using heat according to the heat use conditions of the equipment such as the air cooler. Therefore, there are many problems to be solved in order to put this into practical use without departing from the scope of experimental research.

Therefore, the present applicants have paid attention to the fact that if the flow rate of the heat transfer medium passing through the heat storage tank is changed, the amount of heat released from the heat storage tank to the heat transfer medium will change. By detecting the actual temperature of the heat transfer medium entering the heat exchanger on the heat-using equipment side and operating the flow rate of the heat transfer medium passing through the heat storage tank as an operation signal, We have developed a device that can always control the temperature of the supplied heat transfer medium in accordance with the predetermined heat use conditions of the heat use equipment, and can easily and easily perform the control. It has been disclosed as Japanese Patent Publication No. 5-81832.

[0006]

However, with regard to cooling, this technology is designed to match the load at the peak of the summer hot season as a condition for determining the heat storage capacity when designing the ice heat storage tank. Therefore, during most of the other periods when the load is small, the cooling /
Since the ice heat storage tank is operated at an output of about 0%, the ice storage tank has a considerably large capacity, and on the other hand, the ice making operation with low thermal efficiency has been performed even in winter when the cooling load is small.

Therefore, the applicants have further studied and, even if the heat storage capacity of the ice heat storage tank is set to a small capacity corresponding to a period other than the above, the cooling device is supercooled only when a load exceeding this capacity occurs. By transmitting the heat, the capacity can be reduced by dissipating the heat as cold sensible heat in the early stage of heat dissipation, and when the load is small, the load can be handled with only the cold sensible heat of 0 ° C or more without ice making The present invention was completed by paying attention to the following point.

Therefore, an object of the present invention is to set an operation cooling temperature corresponding to the actual load, thereby obtaining an optimum heat storage capacity for the actual load and a large heat storage capacity for a small load. An object of the present invention is to provide an ice heat storage method capable of coping with a load and, when the load is small, performing a heat storage operation at 0 ° C. or higher to improve thermal efficiency and reduce operating costs. .

[0009]

In order to achieve the above object, the present invention has the following technical means. That is, this will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments of the present invention. The present invention relates to a method in which the heat transfer medium discharged from the heat exchanger 3 of the cold heat generating device 1 is transferred by the pump 10 in the heat storage mode. Heat tube 9
After passing through the ice heat storage tank 8 again,
The heat transfer medium circulating through the heat exchanger 3 and flowing out of the ice heat storage tank 8 is branched by the pump 10 from the upstream side of the ice heat storage tank 8 in the heat transfer tube 9 in the heat storage mode, and the heat transfer of the cold heat use equipment 2 is performed. After passing through the exchanger 7, it passes through the ice heat storage tank 8 via the heat transfer tube 17 in the heat dissipation mode connected downstream of the ice heat storage tank 8,
In the ice heat storage method in which the heat is returned to the heat exchanger 7 of the cold heat use equipment 2 again, the ice heat storage tank 8 is designed and manufactured as a heat storage capacity based on an average annual load in a building, When the load is normal, a normal ice making operation is performed in which the temperature in the ice heat storage tank 8 is 0 ° C. Only when the load is at a peak, the cold heat generating device 1 sets the temperature in the ice heat storage tank 8 to 0 ° C. or less. A supercooling operation is performed, and the heat transfer medium supercooled by the heat exchanger 3 is passed through the ice heat storage tank 8 via the heat transfer tube 9 in the heat storage mode to store heat, and is stored in the ice heat storage tank 8 in the heat release mode.
This is an ice heat storage method utilizing cold / sensible heat, characterized in that cold / sensible heat is radiated at the time of initial heat release. According to the above, only when the load in the building peaks,
The cold heat generating device 1 performs a supercooling operation, stores heat in the ice heat storage tank 8 via the supercooled heat transfer medium, and radiates cold and sensible heat from the ice heat storage tank 8 at the time of initial heat release.
By setting the operating cooling temperature corresponding to the actual load in the building, it is possible to obtain the optimal heat storage capacity for the actual load, and to use the cold sensible heat to increase the load even with a small capacity. The initial cost can be reduced at the same time.

Further, according to the present invention, the ice heat storage tank 8 is designed and manufactured as a heat storage capacity based on an annual average load in a building. Store cold heat of 0 ° C or more in the heat storage tank 8,
In the heat dissipation mode, only the cold and sensible heat is radiated to provide an ice heat storage method using cold and sensible heat. According to the above, in winter when the load is small, the ice making operation is not performed, and only the cold and sensible heat of 0 ° C. or more is stored to correspond to the load, thereby improving the thermal efficiency of the heat storage operation and reducing the operation cost. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings and FIGS. First, an ice heat storage device for performing an ice heat storage method using cold and sensible heat according to the first embodiment of the present invention will be described. FIG. 1 is an overall view showing an example of an ice heat storage device according to a first embodiment of the present invention, and FIG. 2 is a side view of an example of an ice heat storage device in which a part of a cold storage tank is cut away.

In the overall view of the ice heat storage device shown in FIG. 1, reference numeral 1 denotes a refrigerator as a cold heat generating device, 2 denotes a device using cold heat, and a refrigerator 1 includes an evaporator 3 as a heat exchanger, a compressor 4, The cooling / heating equipment 2 includes a condenser 5 and an expansion valve 6, and has a cooler 7 as a heat exchanger.

In order to circulate the heat medium between the evaporator 3 and the ice heat storage tank 8 in the heat storage mode, a heat transfer tube 9 is provided between the evaporator 3 and the ice heat storage tank 8, and the evaporation in the heat transfer tube 9 in the heat storage mode is performed. A pump 10 is provided downstream of the vessel 3,
On-off valves 11 and 12 are provided on the upstream and downstream sides of the ice heat storage tank 8, respectively, and on-off valves 13 and 14 are provided upstream of the evaporator 3 and downstream of the pump 10, respectively.

The heat transfer tube 17 in the heat dissipation mode, which branches off from the branch point 15 upstream of the ice heat storage tank 8 in the heat transfer tube 9 in the heat storage mode, passes through the cooler 7 and is located downstream of the ice heat storage tank 8. A pump 18 is arranged upstream of the cooler 7 of the heat transfer tube 17 and connected to the branch point 16.

Next, in the heat dissipation mode, a portion between the branch point 19 between the pump 18 and the branch point 15 upstream of the cooler 7 in the heat transfer tube 17 and a branch point 20 downstream of the cooler 7. The three-way control valve 2 is connected to the branch point 19 by a bypass pipe 21.
2 is arranged.

The three-way control valve 22 uses a signal from a load detection unit 23 such as a detected temperature in a building, a sensed temperature of a person, or a set temperature scheduled on a program as an operation signal by the controller. The three-way switching operation is performed under proportional control. In the figure, reference numeral 24 denotes a temperature transmitter, 25 denotes a controller, and 26 denotes a setter.

The refrigerator 1 also uses the signal from the load detection unit 23 as an operation signal as a condition for starting overload operation.

Further, the pump 10 disposed in the heat transfer tube 9 in the heat storage mode is operated so as to be driven only in the heat storage mode.
Alternatively, a control system is incorporated so as to be automatically operated, and the pump 18 arranged in the heat transfer tube 17 in the heat dissipation mode is operated or automatically operated so as to be driven only when the heat dissipation mode is taken.

Next, the ice heat storage tank 8 constituting this apparatus will be described.

As shown in FIG. 2, the ice heat storage tank 8 is a capsule-type ice heat storage tank, which is configured as a horizontal stationary type, and is attached to a cylindrical body 27 and left and right ends thereof. It has body lids 28 and 29.

Connection ports 30 and 31 are formed at the centers of the body lids 28 and 29, respectively, and are connected to the heat transfer tubes 9 via the connection ports 30 and 31.

Near the left and right ends of the body 27, flow diffusion members 32, 33 are attached to the body in the form of partition walls facing the connection ports 30, 31, respectively.
A plurality of flow ports 34 are formed in 33, and a drain removing means 41 is provided at the bottom of the body 27.

That is, the circulation port 34 is formed to communicate between the partition chamber 35 partitioned by the member 32 and the inside 36 of the tank, and is formed radially from the center in the circumferential direction. It is desirable that the number of formed parts increases in the circumferential direction so that the number of formed parts per unit area becomes substantially uniform.

In the inside 36 of the ice heat storage tank 8, a large number of small spherical heat storage bodies 37 formed as spherical shells are densely stored in the tank. The small spherical heat storage body 37 stores cold heat as latent heat of solidification when the solid phase changes from the liquid phase to the solid phase, and releases the cold heat previously stored when the solid phase changes to the liquid phase (not shown). ) Is filled in a spherical shell.

The individual size of the small spherical heat storage 37 is as follows.
The diameter is in the range of 20 mm to 200 mm, for example, about 90 mm, and this may be determined based on cooling and freezing conditions, heat storage and heat radiation operation conditions, and the like, in order to secure the entire necessary heat storage tank. Desirably, at the same time, the larger the number of pieces stored in the fixed volume of the ice heat storage tank 8, that is, the smaller the diameter of each small spherical heat storage body 37, the higher the production cost, and thus the above condition is satisfied. It is preferable to work in such a way as to satisfy this manufacturing condition.

As the material of the spherical shell, there are various materials such as metal and synthetic resin. The material is selected from those which can hold the sphere against external and internal forces, heat resistance, production processing and the like. However, in the present invention, the size of the heat storage medium is determined such that a space not occupied by the heat storage medium is formed in the spherical shell when the heat storage medium is in a liquid phase. At the same time, the size of the space is determined so that the expansion amount during volume expansion due to solidification of the heat storage medium is absorbed by the expansion of the space and the spherical shell.

Further, in the present invention, the small spherical heat storage 37
The inside thereof is filled with a heat storage material having a phase change temperature of + 200 ° C. or lower as a heat storage medium.

Next, a first embodiment of the ice heat storage method using cold and sensible heat of the present invention will be described. FIG. 3 to FIG. 5 are explanatory diagrams in the heat storage and heat dissipation modes according to the first embodiment of the ice heat storage method of the present invention.

A series of operations will be described with reference to the above figures.
FIG. 3 shows the heat storage mode. Normally, this heat storage operation is performed using a cheap night time zone.

Here, the signal from the load detection unit 23 is used as an operation signal to control backup operation of the refrigerator 1 or control the constant sending temperature to the heat exchanger 7 by controlling a control system (not shown).

That is, the refrigerant vapor generated in the evaporator 3 by this drive is compressed by the compressor 4 to become high-pressure superheated vapor, and the condenser 5 loses heat to the cooling water to become liquid. The high-pressure liquid is decompressed by the expansion valve 6, the low-pressure low-temperature refrigerant is evaporated by the evaporator 3, and the heat is evaporated from the heat transfer medium having a low freezing point to be cooled.

On the other hand, while the pump 10 is operated, the three-way control valve 22 is switched between the opening a, the opening b, and the opening c, and the pump 18 is also stopped. The heat transfer medium cooled by 3 is pump 10
As a result, circulation is performed between the evaporator 3 and the ice heat storage tank 8 as indicated by an arrow 49.

When the heat transfer medium passes through the ice heat storage tank 8 and the heat storage medium comes into contact with a large number of small spherical heat storage bodies 37 in the ice heat storage tank 8, the heat storage medium in the small spherical heat storage body 37 reaches the freezing point. And harden. At the time of solidification, cold heat is stored in the heat storage medium of the small spherical heat storage 37 as latent heat of solidification.

Next, FIG. 4 shows a heat radiation mode. At this time, the refrigerator 1 is stopped and the pump 10 is also stopped under the control of a control system (not shown). On the other hand, the pump 18
Is driven, and the three-way control valve 22 controls the opening degree according to the degree of load (for example, an electric signal of the load detection unit 23), and
The heat transfer medium is circulated between the ice heat storage tank 8 and the cooler 7 by the pump 18 as described above.

When the heat transfer medium after passing through the cooler 7 passes through the ice heat storage tank 8, the inside of the ice heat storage tank 8 is filled with small spherical heat storage elements 37.
When the melting point is reached, it is melted and the previously stored cold heat is radiated as latent heat of melting. Therefore, the heat transfer medium is cooled and responds to cooling and freezing loads.

Next, FIG. 5 shows the heat dissipation mode of the backup operation, which is performed as needed. That is, in the above-mentioned heat dissipation mode, when the actual detected temperature and the set temperature are controlled equally, the three-way control valve 22 is switched to control the opening degree according to the degree of the load in the same manner as in the heat dissipation mode. A part of the load that cannot be dealt with is handled by operating the pump 10 and the refrigerator 1.

Thus, the heat transfer medium exiting the cooler 7 is
As shown by an arrow 52, not only the ice heat storage tank 8 but also the heat transfer medium exiting the ice heat storage tank 8 through the evaporator 3 by the pump 10 and joined at the branch point 15 and sent to the cooler 7. It is.

In the case of this embodiment, the refrigerator 1 is supercooled only at the peak load time, so that
It is possible to increase the heat storage amount, to cope with a very large load while having a small heat storage capacity, and to reduce the initial cost.

In winter, when the load is small, the output temperature of the refrigerator 1 is set to 0 in the heat storage mode (see FIG. 3).
Set to ℃ or more, do not perform ice making operation in the heat storage tank, and store only the cold sensible heat of 0 ℃ or more. Thereby, the operation efficiency of the refrigerator is improved, and the operation cost can be reduced. The heat dissipation mode (see FIGS. 4 and 5) is as described above.

Next, an ice heat storage device for performing the ice heat storage method according to the second embodiment of the present invention will be described. The same components as those of the above-described embodiment are denoted by the same reference numerals, and detailed description will be omitted.

FIG. 6 is an overall view showing an example of the ice heat storage device according to the second embodiment of the present invention. This ice heat storage device is obtained by adding an additional refrigerator as an additional cold heat generating device to the ice heat storage device shown in FIG.

In FIG. 6, reference numeral 38 denotes an additional refrigerator.
The additional refrigerator 38 has the same configuration as the refrigerator 1 and is arranged between the refrigerator 1 and the ice heat storage tank 8.

More specifically, the additional refrigerator 38 is provided in a bypass pipe 48 connected to a branch point 42 downstream of the evaporator 3 in the heat transfer tube 9 in the heat storage mode. A pump 43 is provided on the downstream side, an on-off valve 44 is provided on the downstream side, and a three-way control valve 40 is provided on the branch point 42.

The three-way control valve 40 uses a signal from the load detecting unit 23 such as a detected temperature in a building, a human sensed temperature, or a set temperature scheduled on a control system program as an operation signal. The three-way switching operation is performed under the control, and the condition is the backup operation control of the refrigerator 1 or the control of the constant sending temperature to the heat exchanger 7.

Next, a second embodiment of the ice heat storage method of the present invention will be described. FIG. 7 to FIG. 10 are explanatory diagrams in a heat storage and heat dissipation mode according to the second embodiment of the ice heat storage method of the present invention. The same parts as those of the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

A series of operations will be described with reference to the above figures.
FIG. 7 shows the heat storage mode. Here, the load detector 2
The signal from 3 is used as an operation signal under the control of a control system (not shown) as a condition for the backup operation of the refrigerator 1 or the constant control of the sending temperature to the heat exchanger 7.

When the pump 10 is operated, the three-way control valve 40 is switched between opening the inlet a, closing the inlet b, and opening the outlet c, so that the heat transfer medium cooled by the evaporator 3 is 10 circulates between the evaporator 3 and the ice heat storage tank 8 as indicated by an arrow 50.

Next, FIG. 8 shows a heat storage mode. When the temperature inside the building rises and this is detected, for example, electrically by the load detection unit 23, the three-way control valve 40 is switched to the entrance. a is opened, the inlet b is opened, and the outlet c is switched to close to open the flow path of the bypass pipe 48.
8 starts the supercooling operation.

In the case of the heat storage mode, the ice heat storage tank 8 is stored as supercooled cold sensible heat by storing the amount of heat stored in the normal period or more by supercooling the refrigerator 38 only at the peak load.

Next, FIG. 9 shows the heat radiation mode, and the arrow 53 showing this circulation path is the same as the arrow 50 of the circulation path in the heat radiation mode in the above embodiment shown in FIG.

FIG. 10 shows a heat dissipation mode of the backup operation, which is performed as needed. That is, in the above-mentioned heat dissipation mode, the temperature inside the building rises,
When this is detected, for example, electrically by the load detection unit 23, the three-way control valve 40 opens the inlet a by the detection signal,
The inlet b is opened and the outlet c is switched to closed, and the bypass pipe 48 is opened.
Of the pump 43 and the refrigerator 3
8 is driven.

Thus, the heat transfer medium exiting the cooler 7 is
As indicated by an arrow 54, the evaporator 3 passes through the evaporator 3 not only by the ice heat storage tank 8 but also by the pump 10 and further along the arrow 51 by the pump 43 from the switched three-way control valve 40. And the heat transfer medium that has exited the ice heat storage tank 8 merges at the branch point 15 and is sent to the cooler 7.

In the case of this embodiment, the supercooling operation of the refrigerator 38 only at the peak of the load can increase the amount of cold and sensible heat and the amount of stored heat. Therefore, it is possible to obtain the optimum heat storage capacity for the actual load.

In winter, when the load is small, in the heat storage mode (see FIG. 7), the output temperature of the refrigerator 1 is set to 0 ° C. or higher, and the ice making operation in the heat storage tank is not performed. Only save. Thereby, the operation efficiency of the refrigerator is improved, and the operation cost can be reduced. The heat dissipation mode (see FIGS. 9 and 10) is as described above.

[0055]

The present invention has the following effects.

As described in detail above, according to the first aspect of the present invention, the supercooled heat transfer medium is stored by performing the supercooling operation of the cold heat generating device only when the load in the building is at a peak, and By dissipating cold and sensible heat during heat dissipation, the operating temperature can be set according to the actual load, so that the ice heat storage tank can obtain the optimal heat storage capacity for the actual load and small capacity. However, it is possible to cope with a large load and to reduce the initial cost. In addition, it is possible to cope with a change in design load, and the degree of freedom in designing a heat storage tank is improved.

According to the invention of claim 2 of the present application, in winter when the load is small, the ice making operation is not performed, and only the cold sensible heat of 0 ° C. or more is stored and released, so that the thermal efficiency during the heat storage operation is improved. Operating costs can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall view showing an example of an ice heat storage device according to a first embodiment of the present invention.

FIG. 2 is a side view showing an example of an ice heat storage device, in which a part of a cold heat storage tank is cut away.

FIG. 3 is an explanatory diagram in a heat storage and heat dissipation mode according to the first embodiment of the ice heat storage method of the present invention.

FIG. 4 is an explanatory diagram in a heat storage and heat dissipation mode according to the first embodiment of the ice heat storage method of the present invention.

FIG. 5 is an explanatory diagram in a heat storage and heat radiation mode according to the first embodiment of the ice heat storage method of the present invention.

FIG. 6 is an overall view showing an example of an ice heat storage device according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram in a heat storage and heat release mode according to a second embodiment of the ice heat storage method of the present invention.

FIG. 8 is an explanatory diagram in a heat storage and heat dissipation mode according to a second embodiment of the ice heat storage method of the present invention.

FIG. 9 is an explanatory diagram in a heat storage and heat radiation mode according to a second embodiment of the ice heat storage method of the present invention.

FIG. 10 is an explanatory diagram in a heat storage and heat dissipation mode according to a second embodiment of the ice heat storage method of the present invention.

FIG. 11 is an overall view of a conventional heat storage cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator (Cold heat generation apparatus) 2 Equipment using cold energy 3 Evaporator (Heat exchanger) 4 Compressor 5 Condenser 6 Expansion valve 7 Cooler (Heat exchanger) 8 Ice heat storage tank 9 Heat storage tube in heat storage mode 10 Pump 11 , 12 on-off valve 13, 14 on-off valve 15, 16 branch point 17 heat transfer pipe 18 in heat dissipation mode 18 pump 19, 20 branch point 21 bypass pipe 22 three-way control valve 23 load detector 27 body 28, 29 body lid 30, 31 connection Ports 32, 33 Diffusion member 34 Distribution port 35 Partition chamber 36 Inside of tank 37 Small spherical heat storage 38 Additional refrigerator 40 Three-way control valve 41 Drain removal means 42 Branch point 43 Pump 44 Open / close valve 48 Bypass pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru 5-34-6 Shiba, Minato-ku, Tokyo Mitsubishi Chemical Engineering Co., Ltd. Project 3 Headquarters Thermal Storage Division (72) Inventor Seiichi Kubokawa Port of Tokyo Metropolitan Government 5-34-6 Shiba-ku, Mitsubishi Thermal Engineering Co., Ltd.

Claims (2)

[Claims] 1. A heat transfer medium flowing out of a heat exchanger 3 of a cold heat generating device 1 is passed by a pump 10 through an ice heat storage tank 8 via a heat transfer tube 9 in a heat storage mode, and then heat exchange of the cold heat generating device 1 is performed again. The heat transfer medium circulating in the vessel 3 and flowing out of the ice heat storage tank 8 is
In the heat storage mode, the pump 10 branches off from the upstream of the ice heat storage tank 8 in the heat transfer tube 9 and the heat exchanger 7 of the cold use equipment 2.
After passing through the ice heat storage tank 8, it passes through the ice heat storage tank 8 via the heat transfer tube 17 in the heat dissipation mode connected downstream of the ice heat storage tank 8, and returns to the heat exchanger 7 of the cold heat use equipment 2 again. In the above, the ice heat storage tank 8 is designed and manufactured as a heat storage capacity based on an annual average load in a building, and when the load is normal, the temperature in the ice heat storage tank 8 is set to 0 ° C. Only when the load is at a peak, the cold heat generating device 1 performs a supercooling operation in which the temperature in the ice heat storage tank 8 is 0 ° C. or less. The heat is stored in the ice heat storage tank 8 through the heat transfer tube 9 in the heat storage mode, and heat is radiated by the cold and sensible heat during the initial heat release from the ice heat storage tank 8 in the heat release mode. Ice storage method using sensible heat. 2. The ice heat storage tank 8 is designed and manufactured as a heat storage capacity based on an annual average load in a building. In the winter when the load is small, the ice heat storage tank 8 is not operated. 2. The method according to claim 1, wherein only the cold and sensible heat is dissipated in the heat radiation mode when the cold heat of 0.degree.