JPH1038325A - Ice heat storage type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ice heat storage type air conditioner in which ice in an ice heat storage tank can be uniformly formed in a short time and a tube in the ice heat storage tank is hardly clogged. SOLUTION: An ice heat storage type air conditioner comprises a brine path A having a refrigerating machine 1, a water heat exchanger 2, an ice heat storage tank 3 and a brine circulating pump 4 which are connected together by a pipeline and a cold water path B having the water heat exchanger 2, an air conditioner 6 and a cold water pump 5 which are connected together by a pipeline. A passage selector valve 10 is attached in the brine path A. When the passage selector valve 10 is switched, the direction for feeding brine passing through the ice heat storage tank 3 is converted into a normal direction or a reverse direction. A control means 11 in which a timer is housed is provided so that the passage selector valve 10 is switched at regular intervals and the direction of the brine passing through the ice heat storage tank 3 is converted. Further, a differential pressure detecting means 12 is attached so that the differential pressure in brine pressure between the outlet and the inlet of the ice heat storage tank 3 is detected. When the differential pressure becomes not lower than a prescribed value, the passage selector valve 10 is switched to convert the direction of the brine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice storage type air conditioner suitable for producing and melting ice in an ice storage tank.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional ice regenerative air conditioning system comprises a refrigerator 1, a water heat exchanger 2, an ice regenerator 3, and a regulating valve 9.
And a brine circulating pump 4 and a chilled water path b formed by connecting the water heat exchanger 2, the air conditioner 6 and the chilled water pump 5 by piping. I have.

[0003] During the heat storage operation at night or the like, the brine cooled by the refrigerator 1 is passed through a heat exchange tube in the ice heat storage tank 3 to freeze the water in the ice heat storage tank 3 to store heat.

[0004] On the other hand, during the heat dissipation operation in the daytime or the like, similarly to the heat storage operation, the brine is cooled by passing heat through the heat exchange tube in the ice heat storage tank 3 to exchange ice with ice, and the cooled brine is transferred to the water heat exchanger 2. Then, the cooling water in the cooling water path b is cooled by the water heat exchanger 2 to take out the cooling capacity from the air conditioner 6.

The control valve 9 controls the temperature of the brine flowing through the water heat exchanger 2, and the control valves 7 and 8 control the amount of the brine flowing through the water heat exchanger 2 by a load.

[0006]

However, according to the above-described conventional ice storage type air conditioner, the flow direction of the brine flowing through the heat exchange tube in the ice storage tank 3 is always constant during the heat storage operation and the heat dissipation operation. . For this reason, the following problems have occurred.

[0007] The ice generated in the ice heat storage tank 3 during the heat storage operation is biased in the ice heat storage tank 3, and the heat exchange efficiency with the brine of the ice heat storage tank 3 decreases, and the ice storage tank 3 is not fully charged. Time will be long.

As the heat exchange tube in the ice heat storage tank 3, a thin tube of about 6 mm is often used in order to increase the ice filling rate, so that dust, scale deposits and the like are clogged in the tube. In some cases, once clogged tubes will have difficulty flowing brine, creating areas where ice is not possible. In this case, the inside of the tube must be cleaned by a troublesome flushing operation or the like, and if the tube cannot be removed by the flushing operation, the entire tube must be replaced.

The present invention has been made in view of the above points, and has as its object to produce ice in an ice heat storage tank uniformly and in a short time, and to make tubes in the ice heat storage tank clogged. An object of the present invention is to provide an ice storage type air conditioner which is difficult to store.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a flow path switching valve installed in a brine path,
By switching the flow path switching valve, the supply direction of the brine flowing into the ice heat storage tank can be changed in the forward and reverse directions. Further, a control means with a built-in timer is attached, and the direction of the brine flowing in the ice heat storage tank is changed by switching the flow path switching valve at regular intervals. Further, a differential pressure detecting means for detecting a differential pressure between the entrance and exit of the brine to the ice heat storage tank is attached, and the flow path switching valve is switched when the differential pressure of the brine pressure between the entrance and the exit becomes a predetermined value or more. It was configured to change the direction of the brine.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 and FIG. 2 are schematic configuration flowcharts showing an ice storage type air conditioner according to an embodiment of the present invention.

As shown in both figures, this ice regenerative air conditioner has a brine path formed by connecting a refrigerator 1, a water heat exchanger 2, an ice heat storage tank 3, a control valve 9, and a brine circulating pump 4 by piping. A, the water heat exchanger 2, the air conditioner 6, and the cold water pump 5
And a cold water path B which is connected by piping.

Here, the water heat exchanger 2 of the brine path A
The control valves 7 and 8 are mounted on the upstream side of the water heat exchanger 2 and in the piping that bypasses the water heat exchanger 2, respectively.

A control valve 9 is provided in a pipe between the ice heat storage tank 3 and the brine pump 4. The control valve 9 controls the temperature of the brine supplied to the water heat exchanger 2 by adjusting the brine passing through the ice heat storage tank 3 and the brine bypassing the ice heat storage tank 3.

In the piping between the water heat exchanger 2 and the ice heat storage tank 3, a flow switching valve 10 composed of a four-way valve is mounted.

A differential pressure switch 12 for detecting a differential pressure of brine pressure between the entrance and the exit is provided between pipes connected to the entrance and exit of the ice heat storage tank 3.

The control panel 11 shown in FIGS. 1 and 2 has a built-in timer and outputs a valve drive signal to the flow path switching valve 10. The control panel 11 receives a differential pressure signal from the differential pressure switch 12.

Next, the operation of the ice storage type air conditioner will be described mainly with reference to FIG. That is, during thermal storage operation at night, etc.,
The brine cooled by the refrigerator 1 is guided to the flow path switching valve 10 without passing through the water heat exchanger 2 by fully closing the control valve 7 and fully opening the control valve 8. The brine enters through the opening 10 a of the flow path switching valve 10, exits through the opening 10 b, and is introduced into the ice heat storage tank 3 from one of the pipes connected to the ice heat storage tank 3. As a result, the brine passes through the heat exchange tube in the ice heat storage tank 3 and exchanges heat with the water in the ice heat storage tank 3 to freeze the water.

The brine coming out of the other pipe connected to the ice heat storage tank 3 enters again through the opening 10d of the flow path switching valve 10, exits through the opening 10c, and returns to the refrigerator 1.

On the other hand, during the heat dissipation operation, the control valve 7 which is fully closed and the control valve 8 which is fully open during the heat storage operation are connected to the cold water path B.
The amount of brine passing through the water heat exchanger 2 is adjusted by controlling the load according to the side load. The other flow of the brine is the same as in the heat storage operation.

Thus, the ice is melted by exchanging heat between the brine flowing in the heat exchange tube in the ice heat storage tank 3 and the frozen ice, and at the same time, the brine is cooled. The water is supplied to the heat exchanger 2 to cool the cold water in the cold water path B.

Next, the operation of the flow path switching valve 10 will be described. As described above, the brine is initially connected to the flow path switching valve 10.
And enters through the opening 10a, exits through the opening 10b, enters the ice storage tank 3 from one of the pipes connected to the ice storage tank 3, and exits through the other pipe connected to the ice storage tank 3 to form the opening 10d. And came out of the opening 10c and returned to the refrigerator 1 (FIG. 1).

On the other hand, when the valve of the flow path switching valve 10 is switched by a valve drive signal from the control panel 11, as shown in FIG.
From the opening 10d, enters the ice heat storage tank 3 from the other pipe connected to the ice heat storage tank 3, exits from one pipe connected to the ice heat storage tank 3, enters the opening 10b,
It comes out of the opening 10c and returns to the refrigerator 1.

That is, the inlet and outlet of the brine to the ice heat storage tank 3 are reversed, and the direction of the brine flowing in the heat exchange tube in the ice heat storage tank 3 is reversed.

The switching of the flow path switching valve 10 is periodically performed by a valve drive signal from a control panel 11 equipped with a timer. That is, the flow direction of the brine supplied into the heat exchange tube of the ice heat storage tank 3 is periodically switched between the forward and reverse directions.

As a result, during the heat storage operation, the ice in the ice heat storage tank 3 is uniformly generated without being biased to one side, and during the heat dissipation operation, the ice is similarly melted uniformly. Heat exchange efficiency is improved.

Further, dust and scale clogged in the heat exchange tube can be removed by the backwash effect.

On the other hand, apart from the periodic change of the flow direction of the brine, the differential pressure switch 12 detects that the differential pressure between the outlet and the inlet of the brine to the ice heat storage tank 3 has reached a predetermined value or more. When it is detected, the flow switching valve 10 is forcibly switched to reverse the flow of the brine in the heat exchange tube of the ice heat storage tank 3.

The fact that the pressure difference is large means that the brine is difficult to flow due to clogging of the heat exchange tube and the like of the ice heat storage tank 3. Therefore, in such a case, the clogged dust and scale are removed by the backwashing effect of the backflow of the brine.

[0030]

As described above in detail, according to the present invention, the flow path switching valve for switching the supply direction of the brine to the ice heat storage tank in the forward and reverse directions is provided in the brine path.
It has the following excellent effects.

Since the generation and melting of ice in the ice heat storage tank can be uniformly performed as a whole, the heat storage time can be shortened and the heat exchange efficiency of the heat radiation operation can be improved.

Even if the heat exchange tube in the ice storage tank is clogged, the clogging can be eliminated by the backwash effect by reversing the flow of the brine, and maintenance such as flushing work is almost unnecessary.

In particular, when the switching by the flow path switching valve is periodically performed by a timer, the flow of the brine is periodically converted, so that the above-described effects can be more effectively exerted.

Further, if the switching by the flow path switching valve is performed when the pressure difference between the inlet and the outlet of the brine to the ice heat storage tank becomes a predetermined value or more, the heat exchange tube in the ice heat storage tank is actually used. When clogging is caused, the clogging can be eliminated, which is more effective.

[Brief description of the drawings]

FIG. 1 is a schematic configuration flowchart of an ice storage type air conditioner according to an embodiment of the present invention.

FIG. 2 is a flow path switching valve 10 of the ice storage type air conditioner shown in FIG.
FIG. 4 is a schematic configuration flowchart when switching is performed.

FIG. 3 is a schematic flow chart of a conventional ice storage type air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Water heat exchanger 3 Ice storage tank 4 Brine circulation pump 5 Cold water pump 6 Air conditioner 7, 8, 9 Control valve 10 Flow path switching valve 11 Control panel 12 Differential pressure switch A Brine path B Chilled water path

Claims (3)

[Claims] 1. A brine path formed by connecting a refrigerator, a water heat exchanger, an ice storage tank, and a brine circulation pump with a pipe, and connecting the water heat exchanger, an air conditioner, and a chilled water pump with a pipe. A cold water path, wherein heat is stored by freezing the water in the ice heat storage tank with brine cooled by the refrigerator, and the brine cooled by melting the ice in the ice heat storage tank is cooled by the water. An ice regenerative air conditioner having a structure in which the water in the cold water path is guided by a heat exchanger and heat of the cold water is taken out from the air conditioner. In the brine path, supply of brine to the ice heat storage tank during the brine path An ice regenerative air conditioner equipped with a flow path switching valve for switching between the forward and reverse directions. 2. The ice heat storage air conditioner according to claim 1, wherein a control means with a built-in timer is installed in said ice storage type air conditioning equipment, and said flow path switching valve is switched at regular intervals by said control means. Air conditioning. 3. The ice storage type air conditioner is provided with a differential pressure detecting means for detecting a differential pressure between an outlet and an inlet of the brine to the ice storage tank, and the flow path switching valve is provided with the differential pressure detecting means. 2. The ice storage type air conditioner according to claim 1, wherein the switching is performed when the detected differential pressure becomes equal to or more than a predetermined value.