JPH1123116A - Ice heat storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply an ice containing fluid to a condenser with reduced thermal loss and with excellent response in an additional operation where, when the amount of recovery of cold heat is increased upon a peak of a cooling load, an operation of an ice making machine is simultaneously performed. SOLUTION: An ice heat storage tank 1 for storing an ice containing fluid therein and an ice making machine 3 are connected with each other through a first piping 5 for supplying a fluid to be frozen, and the ice making machine 3 and the ice heat storage tank 1 are connected with each other through a second piping 8. A middle portion of the second piping 8 and the condenser 10 are connected through a third piping 12, and the condenser 10 and an upper supply pipe 9 of an upper portion of the ice heat storage tank 1 are connected through a fourth piping 13. A first opening/closing valve 7 is provided on the second piping 8, and a second opening/closing valve 11 is provided on the third piping 12. With opening/closing changeover there are changed the operation to a state where the ice containing fluid from the ice making machine 3 is directly supplied to the condenser 13 and a state where the same is directly supplied to the ice heat storage tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing ice using an ice making device by utilizing nighttime electric power, and storing the ice in an ice heat storage tank so that a heat source for cooling can be obtained at a low cost. The present invention relates to an ice heat storage system configured to recover stored cold heat and use it as a heat source for daytime cooling.

[0002]

2. Description of the Related Art An ice heat storage system as described above includes:
Conventionally, it is configured as shown in the system configuration diagram of FIG.

[0003] That is, at the bottom side of the ice heat storage tank 01 for storing the ice-containing liquid, a take-out pipe 02 for taking out the frozen liquid is provided.
The extraction pipe 02 and the ice maker 03 are connected via a first pipe 05 provided with a primary pump 04. Further, a supply pipe 06 for the ice-containing liquid is provided above the take-out pipe 02, and the supply pipe 06 and the ice maker 03 are provided.
Are connected via a second pipe 08 having an on-off valve 07.

On the other hand, a nozzle pipe 09 for returning the liquid after the heat exchange is provided in an upper part in the ice heat storage tank 01, and the nozzle pipe 09 and a bottom side of the ice heat storage tank 01 are connected to the secondary pump 0.
10 and a condenser 011 are connected via a secondary-side pipe 012. Although not shown, the condenser 011 includes:
A pipe provided over an individual air conditioner disposed in each room is connected, and the refrigerant is liquefied in the condenser 011.
On the other hand, the individual air conditioner is configured to recover and use the cold heat in the condenser 011 such that the refrigerant liquid is vaporized and flown by natural circulation to perform cooling.

[0005] With the above configuration, the heat storage operation is performed by using the nighttime electric power, and the frozen liquid is supplied from the ice heat storage tank 01 to the ice making machine 03.
To produce ice-containing liquid, supply the ice-containing liquid to the bottom of the ice heat storage tank 01, and store ice in the ice heat storage tank 01. On the other hand, in the daytime,
Cold water is supplied to the condenser 011 from the ice heat storage tank 01, and is used as a heat source for cooling.

When the cooling load increases in the summer, the ice maker 03 is operated even in the daytime,
The icing liquid is supplied from the ice heat storage tank 01 to the ice making machine 03, and the obtained ice-containing liquid is supplied into the ice heat storage tank 01, so that a so-called chasing operation is performed so as to prevent shortage of cold heat.

[0007]

However, in the conventional ice heat storage system, the ice-containing liquid produced by the ice making machine 03 is returned into the ice heat storage tank 01 during the chase operation.
Cold water cooled by the ice-containing liquid is supplied to a condenser 011.
Therefore, there is a drawback in that a low-temperature heat energy of the ice-containing liquid is consumed to cool the liquid in the ice heat storage tank 01, resulting in a heat loss. Further, as a result of the above-described configuration, the temperature of the cold water supplied to the condenser 011 becomes higher than the temperature of the ice-containing liquid, and there is a disadvantage that the response to a sudden load change is low.

[0008] Further, there has been proposed an apparatus in which a secondary pipe on a condenser side and a primary pipe on an ice making machine are directly connected in an ice heat storage tank (Japanese Patent Laid-Open No. 8-122822). Heat loss occurred when passing through the heat storage tank, and there was still room for improvement.

The present invention has been made in view of such circumstances, and the invention according to claim 1 operates the ice making machine when the amount of recovered cold heat increases, such as during peak cooling loads. It is an object of the invention according to claim 2 to make it possible to supply the ice-containing liquid to the condenser with little heat loss and good responsiveness during the chase operation in which the system is simultaneously operated. The purpose is to be able to construct at low cost.

[0010]

The invention according to claim 1 is
In order to achieve the above object, an ice heat storage tank for storing an ice-containing liquid and an ice making machine are connected via a first pipe for supplying a frozen liquid, and the ice making machine and the ice heat storage tank are connected to each other. Are connected via a second pipe for supplying the ice-containing liquid to the ice heat storage tank, and the ice heat storage tank and the cold heat recovery means are connected to each other. And a switching mechanism for switching between a state in which the ice-containing liquid from the ice making machine is directly supplied to the cold heat recovery means and a state in which the ice-containing liquid is directly supplied to the ice heat storage tank. It is composed.

According to a second aspect of the present invention, in order to achieve the above object, a pump for supplying a frozen liquid to an ice making machine is provided only in the first pipe in the first aspect of the present invention. The pump is also used as a supply unit for supplying the ice-containing liquid from the ice maker to the cold heat recovery unit.

[0012]

According to the configuration of the ice heat storage system of the first aspect of the present invention, when the normal heat storage operation is performed at night,
Supplying the ice-containing liquid from the ice machine directly to the ice thermal storage tank,
Also, during a chasing operation when the amount of recovered cold energy increases, such as during a peak cooling load, the ice-containing liquid from the ice maker is directly supplied to the cold energy recovery means without passing through the ice heat storage tank.

Further, according to the configuration of the ice heat storage system of the second aspect of the present invention, the supply of the ice-containing liquid from the ice maker to the ice heat storage tank during the normal heat storage operation and the ice maker during the chase operation. And supply of the ice-containing liquid to the cold heat recovery means by the same pump.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram showing a first embodiment of an ice heat storage system according to the present invention, and a take-out pipe for taking out a frozen liquid is provided at a bottom side of an ice heat storage tank 1 for storing an ice-containing liquid. 2, the take-out pipe 2 and the ice maker 3 are connected via a first pipe 5 provided with a pump 4. Examples of the ice-containing liquid include ethylene glycol, glycerin, propylene glycol, ethanol,
Using a special solution such as calcium chloride as a solute, using water as a solvent, and brine, which is an aqueous solution having a lower freezing point than water and a higher specific gravity than ice, freezes the water in the brine with an ice maker 3 to form a sherbet. What produces an ice slurry is used.

At the lower part of the ice thermal storage tank 1, a take-out pipe 2 is provided.
A lower supply pipe 6 for supplying an ice-containing liquid is provided at an upper portion near the lower supply pipe, and the lower supply pipe 6 and the ice making machine 3
Are connected via a second pipe 8 having an on-off valve 7.

An upper supply pipe 9 is provided in the upper part of the ice heat storage tank 1, and a portion of the second pipe 8 between the ice making machine 3 and the first opening / closing valve 7 and a condenser 10 as cold heat recovery means. And the second
The upper supply pipe 9 and the condenser 10 are connected via a fourth pipe 13. Although not shown, the condenser 10 includes:
The piping provided is connected to the individual air conditioners disposed in each room, and the refrigerant is liquefied in the condenser 10, while the individual air conditioner vaporizes the refrigerant liquid and causes the refrigerant to flow by natural circulation. It is configured to perform cooling.

With the above arrangement, during the nighttime heat storage, in the first half of the heat storage, as shown in FIG. 1A, the first on-off valve 7 is opened, the second on-off valve 11 is closed, and the liquid to be frozen is removed. Ice is supplied from the ice heat storage tank 1 to the ice making machine 3 through the first pipe 5 to produce ice, and the obtained ice-containing liquid from the ice making machine 3 is supplied to the lower part of the ice heat storage tank 1 through the second pipe 8. ,
The supplied ice is floated and stored in layers on the upper side of the ice heat storage tank 1.

On the other hand, in the second half of the heat storage, the first on-off valve 7 is closed and the second on-off valve 11 is opened, as shown in FIG. 1 pipe 5
Is supplied to the ice making machine 3 to produce ice, and the obtained ice-containing liquid from the ice making machine 3 is supplied to the second pipe 8 and the third pipe 1.
2. The ice-containing liquid is supplied to the upper part of the ice heat storage tank 1 through the condenser 10 and the fourth pipe 13, and the ice-containing liquid is supplied and stored on the layered ice stored on the upper side of the ice heat storage tank 1. At this time, if the cooling is not performed by the individual air conditioner or the like, the cool heat is not recovered by the condenser 10.
The ice-containing liquid is supplied to the ice heat storage tank 1 as it is.

When cooling in the daytime, the first
The on-off valve 7 is closed, the second on-off valve 11 is opened, and in a state where the ice making machine 3 is stopped, the cold water is taken out from the ice heat storage tank 1 and supplied to the condenser 10 through the ice making machine 3 in the stopped state. And use it as a heat source for cooling.

When the chase operation is performed, the ice maker 3 is driven in the above-described state, and the ice-containing liquid obtained by the ice maker 3 is directly supplied to the condenser 10. The same applies to the heat storage operation for the skeleton and the cooling operation during overtime.

FIG. 2 is a system configuration diagram showing a second embodiment of the ice heat storage system according to the present invention. The difference from the first embodiment is as follows. That is, in the middle of the first pipe 5, a first pumped pipe 23 having a first pump 21 and a first one-way valve 22, a second pump 24 and a second one-way valve 25, A second pumping pipe 27 having a third on-off valve 26 is connected in parallel with each other.

A portion between the second one-way valve 25 and the third on-off valve 26 in the second pumping pipe 27;
Second on-off valve 11 and condenser 10 in third pipe 12
Is connected via a fifth pipe 29 provided with a fourth on-off valve 28. Fifth pipe 13
Open / close valve 30 is provided.

With the above configuration, the nighttime heat storage operation state using inexpensive nighttime electric power at night, the daytime operation state using cold heat in the ice heat storage tank 1 during the daytime, and the ice making by the ice making machine 3 are performed at the same time. Daytime chasing operation state, nighttime body heat storage operation state for nighttime heat storage, overtime operation state for overtime work, ice machine maintenance state for performing maintenance of ice machine 3 in daytime operation state, and first and second states Pump maintenance states for performing maintenance of the pumps 21 and 24 are obtained, which will be described below.

Night heat storage operation state First, in the first half of the heat storage, only the first on-off valve 7 is opened and the second and third on-off valves 11 and 26 are opened as shown in the system configuration diagram of FIG. To close the first pump 21
Then, the ice making machine 3 is driven, and the second pump 24 is stopped. The fourth and fifth on-off valves 28, 30 may be open or closed.

As a result, the frozen liquid from the ice heat storage tank 1 is supplied from the extraction pipe 2 to the ice making machine 3 through the first pipe 5 and the first pipe 23 with the pump.
Is supplied to the lower portion of the ice heat storage tank 1 through the second pipe 8 and the lower supply pipe 6, and the ice floats and is stored in a layered manner on the upper side of the ice heat storage tank 1.

In the latter half of the heat storage after a predetermined amount of ice has been stored (for example, two hours after the start of heat storage, etc.), as shown in the system configuration diagram of FIG. Then, the second and fifth on-off valves 11, 30 are opened,
The first and third on-off valves 7 and 26 are closed to drive the first pump 21 and the ice making machine 3 and the second pump 24
Is stopped. The fourth on-off valve 28 may be open or closed.

Thus, the frozen liquid from the ice heat storage tank 1 is supplied from the extraction pipe 2 to the ice making machine 3 through the first pipe 5 and the first pumping pipe 23, and the ice making machine 3
From the second pipe 8 and the third pipe 12
Is supplied to the upper part of the ice heat storage tank 1 through the fourth pipe 13 through the condenser 10, and the ice-containing liquid is supplied onto the layered ice stored in the upper part of the ice heat storage tank 1 to store the ice. To go.

Daytime operation state and daytime chase operation state As shown in the system configuration diagram of FIG. 3, the second, fourth and fifth on-off valves 11, 28 and 30 are opened, and the first and third on-off valves are opened. 7, 26 are closed.

In the daytime operation state, the first and second pumps 21 and 24 are driven with the ice making machine 3 stopped.
Thereby, the cold water from the ice heat storage tank 1 is discharged from the outlet pipe 2 to the first pipe 5, the first pipe with a pump 23, the ice machine 3 in a stopped state, the second pipe 8, the third pipe 12, and the condensate. Vessel 1
0, the fourth pipe 13 and the upper supply pipe 9, which are supplied to the condenser 10 while flowing from the outlet pipe 2 to the first pipe 5, the second pipe 27 with a pump, and the fifth pipe 29.
Chilled water supplied through the chiller is also supplied to the condenser 10, and chilled heat is supplied to the condenser 10.

In the daytime chase operation state, the ice making machine 3 is driven in the above-mentioned daytime operation state, and the ice-containing liquid from the ice making machine 3 is supplied to the cold water supplied through the second pumped pipe 27 and the fifth pipe 29. Merged and supplied directly to the condenser 1
0 is supplied with cold.

Night frame heat storage operation state and overtime operation state As shown in the system configuration diagram of FIG. 4, the second, fourth and fifth on-off valves 11, 28 and 30 are opened, and the first and third on-off valves are opened. Open the valves 7 and 26 and set the ice making machine 3 and the first
And the second pump 24 is stopped.

Thus, the ice-containing liquid obtained in the ice making machine 3 is passed through the second and third pipes 8 and 12 to the condenser 1
In addition, it is possible to supply air directly to the air conditioner 0, perform cooling with the cool heat obtained in the condenser 10, perform heat storage in the skeleton at night, or perform cooling for the remaining workers.

Ice Machine Maintenance State As shown in the system configuration diagram of FIG. 5, the third, fourth and fifth on-off valves 26, 28 and 30 are opened, and the first and second on-off valves 7 and 11 are opened. Close and drive the first and second pumps 21, 24. Then, a connection point between the ice making machine 3 and each of the first pipe 5 and the second pipe 8 is closed (indicated by a valve symbol).

Thus, in the daytime, maintenance can be performed by supplying the cold water from the ice heat storage tank 1 to the condenser 10 and appropriately removing the ice making machine 3 while performing cooling by the cool heat obtained in the condenser 10. .

Pump maintenance state for the first pump 21 As shown in the system configuration diagram of FIG. 6, the second, third and fifth on-off valves 11, 26 and 30 are opened, and the first and fourth on-off valves are opened. The valves 7, 28 are closed and only the second pump 24 is driven. Then, with the ice maker 3 being driven or stopped, the cold water from the ice heat storage tank 1 and the ice-containing liquid from the ice maker 3 are supplied to the condenser 10. Although not shown, the first
The connection between the pipe 5 and the first pumped pipe 23 is closed.

Thus, in the daytime, maintenance can be performed by appropriately removing the first pump 21 while cooling by the cold heat obtained in the condenser 10 by the cold water or the ice-containing liquid by the chase operation.

Pump maintenance state for the second pump 24 As shown in the system configuration diagram of FIG. 7, the second and fifth on-off valves 11, 30 are opened, and the first and third on-off valves 7, 26 are opened. Close and drive only the first pump 21. Then, with the ice maker 3 being driven or stopped, the cold water from the ice heat storage tank 1 and the ice-containing liquid from the ice maker 3 are supplied to the condenser 10. The fifth on-off valve 28 may be open or closed. Although not shown, the first pipe 5
The connection between the pump and the second pipe with pump 27 is closed.

Thus, in the daytime, maintenance can be performed by appropriately removing the second pump 24 while cooling by the cold heat obtained in the condenser 10 by the cold water or the ice-containing liquid by the chase operation. The other configuration is the same as that of the first embodiment, and the description thereof will be omitted by retaining the same reference numerals.

FIG. 8 is a system configuration diagram showing a third embodiment of the ice heat storage system according to the present invention. The difference from the second embodiment is as follows. That is, the connection point of the second pipe 5 with the third pipe 12 and the halfway point of the fourth pipe 13 between the fifth on-off valve 30 and the ice heat storage tank 1 correspond to the sixth on-off valve 31. It is connected via an interposed sixth pipe 32.

With the above configuration, during the heat storage operation at night, only the first on-off valve 7 is opened in the first half of the heat storage, and the second, third, fifth and sixth on-off valves 11, 26, 30,
31 is closed, the first pump 21 and the ice maker 3 are driven, and the second pump 24 is stopped. The fourth on-off valve 28 may be open or closed.

As a result, as in the second embodiment, the liquid to be frozen from the ice heat storage tank 1 is removed from the extraction pipe 2 to the first pipe 5.
And the ice-containing liquid from the ice making machine 3 is supplied to the lower part of the ice heat storage tank 1 through the second pipe 8 and the lower supply pipe 6. Then, the ice floats and is stored in layers on the upper side of the ice heat storage tank 1.

In the latter half of the heat storage after a predetermined amount of ice is stored (for example, two hours after the start of heat storage, etc.), as shown in the system configuration diagram of FIG. Only the on-off valve 31 is opened, the first, second, third and fifth on-off valves 7, 11, 26, 30 are closed, the first pump 21 and the ice making machine 3 are driven, and the second pump 24 is stopped. The fourth on-off valve 28 may be open or closed.

Thus, the frozen liquid from the ice heat storage tank 1 is supplied from the extraction pipe 2 to the ice making machine 3 through the first pipe 5 and the first pipe 23 with the pump, and the ice making machine 3
Is supplied from the second pipe 8 to the upper portion of the ice heat storage tank 1 through the sixth and fourth pipes 32 and 13 without passing through the condenser 10, and is supplied to the upper side of the ice heat storage tank 1. The ice-containing liquid is supplied onto the stored layered ice, and the ice is stored.

The other configuration and the operation in other operating states are the same as those of the second embodiment by closing the sixth on-off valve 31, and the same reference numerals are used. The description is omitted.

According to the third embodiment, in the heat storage operation in the ice heat storage tank 1 at night, the ice-containing liquid from the ice making machine 3 does not pass through the condenser 10 and the heat loss is reduced in a state where the pipe length is short. It has the advantage that it can be supplied to the ice heat storage tank 1 with a small amount.

In the above embodiment, when the cold water taken out of the ice heat storage tank 1 is supplied to the condenser 10, the cold water flows through the ice maker 3 in a stopped state.
When the ice making machine 3 is stopped, cold water may be supplied to the condenser 10 through the bypass piping without flowing through the ice making machine 3.

In order to switch between the state in which the ice-containing liquid from the ice maker 3 is directly supplied to the ice heat storage tank 1 and the state in which the ice-containing liquid is directly supplied to the condenser 10, the first embodiment is different from the first embodiment. A configuration including the first on-off valve 7 and the second on-off valve 11, a configuration including the first on-off valve 7, the second on-off valve 11, and the fifth on-off valve 30 in the second embodiment, 3
The structure including the first on-off valve 7, the second on-off valve 11, the fifth on-off valve 30, and the sixth on-off valve 31 in the embodiment is called a switching mechanism. As the switching mechanism, for example, in the first and second embodiments, a rotary three-way valve may be provided at a connection point between the second pipe 8 and the third pipe 12, or the like.

In the second and third embodiments, the first and second pumps 2
1, 24 are provided so that maintenance of any of the pumps can be performed without interrupting the operation. However, it is possible to directly supply the ice-containing liquid from the ice making machine 3 to the condenser 10. Is always one pump, and the configurations of the second and third embodiments are also included in the scope of claim 2.

In the above-described embodiment, the condenser 10 is used to recover cold heat. However, the present invention relates to, for example, a heat exchanger configured using water instead of refrigerant on the secondary side. However, they may be collectively referred to as cold heat recovery means.

[0051]

As described above, according to the ice heat storage system of the first aspect of the present invention, during the chase operation when the amount of recovered cold energy increases, such as at the time of a peak cooling load, the ice storage system receives the ice heat from the ice maker. Since the ice-containing liquid is directly supplied to the cold heat recovery means without passing through the ice heat storage tank, the cold energy of the obtained ice-containing liquid is not consumed without cooling the liquid in the ice heat storage tank. The whole amount can be given to the cold heat recovery means with little heat loss. Moreover, since the ice is contained and supplied to the cold heat recovery means, the heat of fusion can be sufficiently utilized to recover lower-temperature heat energy, and the recovered low-temperature heat energy can be used as a cooling heat source for an individual air conditioner or the like. In such a case, the responsiveness to load fluctuations such as a sudden increase in cooling load in summer can be greatly improved.

Further, according to the ice heat storage system of the second aspect of the present invention, the supply of the ice-containing liquid to the ice heat storage tank during the normal heat storage operation and the supply of the ice-containing liquid to the cold heat recovery means during the chase operation. Since the supply is performed by the same pump, there is no need to provide an individual pump, the configuration is simplified, the system can be constructed at low cost, and the system is economical.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a first embodiment of an ice heat storage system according to the present invention.

FIG. 2 is a system configuration diagram showing a night heat storage operation state in a second embodiment of the ice heat storage system according to the present invention.

FIG. 3 is a system configuration diagram showing a daytime operation state and a daytime chase operation state.

FIG. 4 is a system configuration diagram showing a nighttime frame thermal storage operation state and an overtime operation state.

FIG. 5 is a system configuration diagram showing an ice making machine maintenance state.

FIG. 6 is a system configuration diagram showing a pump maintenance state for a first pump.

FIG. 7 is a system configuration diagram showing a pump maintenance state for a second pump.

FIG. 8 is a system configuration diagram showing a third embodiment of the ice heat storage system according to the present invention.

FIG. 9 is a system configuration diagram showing a state in which an ice-containing liquid is supplied from above the ice heat storage tank.

FIG. 10 is a system configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ice heat storage tank 3 ... Ice machine 4 ... Pump 5 ... 1st piping 7 ... 1st opening / closing valve which comprises a switching mechanism 8 ... 2nd piping 10 ... Condenser 11 ... 2nd which comprises a switching mechanism On-off valve 12 ... Third pipe 21 ... First pump 24 ... Second pump 30 ... Fifth on-off valve constituting a switching mechanism 31 ... Sixth on-off valve constituting a switching mechanism

Claims (2)

[Claims] 1. An ice heat storage tank for storing an ice-containing liquid and an ice making machine are connected via a first pipe for supplying a frozen liquid, and the ice making machine and the ice heat storage tank are connected to each other by an ice containing tank. Connected via a second pipe for supplying liquid to the ice storage tank,
In addition, in the ice heat storage system in which the ice heat storage tank and the cold heat recovery means are connected, an intermediate part of the second pipe and the cold heat recovery means are connected to a third heat recovery means.
And a switching mechanism for switching between a state in which the ice-containing liquid from the ice making machine is directly supplied to the cold heat recovery means and a state in which the liquid is directly supplied to the ice heat storage tank. An ice storage system characterized by the following. 2. A pump for supplying icing liquid to the ice making machine is provided only in the first pipe according to claim 1, and the pump is connected to the cold heat recovery means by means of the ice-containing liquid from the ice making machine. An ice heat storage system that is also configured as a supply unit.