JPH07109324B2 - Heat storage type air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat storage type air conditioner that supercools a refrigerant by a heat storage medium of a heat storage tank that stores cold heat, and particularly relates to a reliability improvement measure thereof.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-125551, air provided with a refrigeration circuit in which a compressor, an outdoor heat exchanger, a pressure reducing mechanism, and an outdoor heat exchanger are sequentially connected. In the harmony device, a heat storage tank containing a heat storage medium capable of storing cold heat,
A heat exchanger for exchanging heat between the refrigerant in the refrigeration circuit and the heat storage medium is arranged inside the heat storage tank, and the heat exchanger is provided as a bypass path from the liquid line of the refrigerant circuit to the suction line side. During the normal cooling operation, the refrigerant circulates in the refrigerant circuit, while during the cold storage operation that stores the cold heat in the heat storage medium, the refrigerant uses the cold storage heat from the liquid line to the suction line through the bypass passage to use the cold storage heat. It is known to use a common heat exchanger of the heat storage tank by switching the circulation path of each refrigerant so that the refrigerant is returned from the liquid line to the liquid line through the bypass passage during the recovery cooling operation. There is.

(Problems to be Solved by the Invention) However, the above conventional ones have the following problems.

That is, in the normal cooling operation and the cold storage heat recovery cooling operation, since it is necessary to switch the refrigerant circulation path between the refrigerant circuit side and the bypass path side, the state of the refrigerant fluctuates when the circulation path is switched, and the control is Reliability is reduced, such as instability.

In addition, the utilization rate of the cold storage heat cannot be adjusted as necessary during the cold storage heat recovery cooling operation.

Therefore, it is conceivable to provide only the heat exchanger for recovering cold storage heat on the outside of the heat storage tank, that is, on the refrigerant circuit side. In that case, the heat exchangers are arranged at two positions on the heat storage tank side and the refrigerant circuit side, Since it is necessary to switch the circulation path of the refrigerant to each of them, there is a problem that the configuration becomes complicated.

The present invention has been made in view of such a point, and an object thereof is to provide a cold storage heat exchanger and a cold storage heat recovery heat exchanger in common in a refrigerant circuit outside the heat storage tank, thereby circulating the heat. Controls the fluctuation of the refrigerant state due to the switching of the route to improve reliability, and adjusts the heat transfer rate between the heat storage tank and the heat exchanger for recovery of cold storage heat to adjust the rate of utilization of cold storage heat. Is to enable.

(Means for Solving Problems) A first solving means for achieving the above object is, as shown in FIGS. 1 to 3, a compressor (1), a heat source side heat exchanger (2), A refrigerant circuit (7) in which the main decompression mechanism (3) and the utilization side heat exchanger (4) are sequentially connected by a refrigerant pipe (6),
A heat storage type air conditioner provided with a heat storage tank (9) for storing a heat storage material capable of storing cold heat.

And, it is provided between the heat source side heat exchanger (2) of the refrigerant circuit (7) and the main decompression mechanism (3), and performs heat exchange with the heat storage medium of the heat storage tank (9). Heat storage heat exchanger (10)
And a circulation path (11) that circulates the heat storage heat exchanger (10) and the heat storage tank (9) so that heat can be transferred, and the circulation path (11)
Forced circulation means (12) that is installed in the machine and forcibly transfers heat
And the heat storage heat exchanger (10) of the refrigerant circuit (7) and the heat source side heat exchanger (2).
In the cold storage heat depressurizing mechanism (13) for depressurizing the refrigerant during the cold storage heat, and the first bypass path (1) for circulating the refrigerant in the refrigerant circuit (7) by bypassing the cold storage heat depressurizing mechanism (13).
4), a first switching means (15) for switching the flow of the refrigerant in the refrigerant circuit (7) between the heat storage decompression mechanism (13) side and the first bypass path (14) side, and the refrigerant circuit (7). The refrigerant pipe (6) between the heat storage heat exchanger (10) and the main pressure reducing mechanism (3) is bypassed to the suction line (6b) side by the main pressure reducing mechanism (3) and the use side heat exchanger (4). Second bypass path to connect (16)
And a second switching means (30) for switching the flow of the refrigerant in the refrigerant circuit (7) between the main pressure reducing mechanism (3) side and the second bypass passage (16) side.

Further, during the cold storage heat operation, the forced circulation means (12) is operated, and the refrigerant is depressurized by the storage heat depressurization mechanism (13) and evaporated in the heat storage heat exchanger (10) and then the second bypass passage (16).
The forced circulation means (12) is operated during the cold heat recovery operation so that the refrigerant returns to the compressor (1) via the first
During the normal cooling operation, the forced circulation means (such as the above-mentioned forced circulation means () so as to be supercooled in the heat storage heat exchanger (10) via the bypass passage (14) and evaporated in the utilization side heat exchanger (4) to return to the compressor (1). 12)
Operation control means for controlling the forced circulation means (12) and the first and second switching means (15), (30) so that the refrigerant is circulated in the same manner as during the cold storage heat recovery operation. 20) is provided.

In the second solution means, the forced circulation means (12) in the first solution means is configured so that the amount of heat transfer can be adjusted, and the operation control means (20) is adapted to the operation condition during the cold heat recovery operation. The forced circulation means (12) is configured to control the heat transfer amount.

A third solving means is the above first or second solving means, wherein the heat storage material is water, and the heat storage tank (9) is provided with an ice making coil (19) for making water by heat exchange between the water and the heat exchange medium. Provided,
The circulation path (11) is connected to the heat storage heat exchanger (10) and the ice making coil (19).
Shall be connected.

Then, a heat exchange medium such as brine circulates between the ice making coil (19) and the heat storage heat exchanger (10) via the circulation path (11), and the heat exchange medium causes the heat exchange medium between the refrigerant and the water to flow. It is configured to transfer heat.

A fourth solving means is the capsule (2) having the latent heat storage material in the heat storage tank (9) according to the first or second solving means.
1) is built in, and the circulation path (11) is constituted by a forward path (11a) and a return path (11b) that connect the heat storage heat exchanger (10) and the heat storage tank (9).

Then, a heat exchange medium such as brine circulates between the heat storage tank (9) and the heat storage heat exchanger (10) via the circulation path (11),
The heat exchange medium is configured to transfer heat between the refrigerant and the latent heat storage material.

(Operation) With the above configuration, in the invention of claim (1), the operation control means (20) does not force the circuit connection by the first and second switching means (15) and (30) to force the operation. Circulation means (1
The normal cooling operation and the cold storage heat recovery cooling operation are switched only by the presence or absence of heat transfer from the heat storage tank (9) to the heat storage heat exchanger (10) by 2). That is, since the circulation path of the refrigerant cannot be switched, the state of the refrigerant does not change and the reliability is improved.

According to the invention of claim (2), the heat transfer amount of the forced circulation means (12) of the circulation path (11) is controlled by the operation control means (20) during the cold storage heat recovery cooling operation in the invention of claim (1). The utilization rate of the cold storage heat of the heat storage tank (9) is adjusted.
Therefore, the taken-out amount of the cold storage heat is controlled according to the required capacity on the indoor side, the remaining amount of the cold storage heat, and the like, and the operation efficiency is improved.

In the invention of claim (3), the above claim (1) or (2)
In the operation of the invention of claim 1, a heat exchange medium such as brine flows through the circulation path (11), and the heat storage tank (9) is passed through the heat exchange medium.
Heat is transferred between the heat storage heat exchanger (10) and the heat storage heat exchanger (10). The ice-making coil (19) makes ice in the water in the heat-storage tank (9) during the cold-storage heat-cooling operation, so that not only sensible heat but also latent heat is used to store cold heat, so that a large amount of cold storage heat can be secured. become.

In the invention of claim (4), during the cold heat storage operation, the latent heat storage material in the capsule (21) is solidified by the cold heat given to the water by heat exchange with the refrigerant, and the ice making coil or the like is stored in the heat storage tank (9). Since a high amount of cold storage heat using latent heat is secured without providing, a high amount of cold storage heat can be obtained with a simple configuration.

(Example) Hereinafter, the Example of this invention is described based on drawing.

FIG. 1 is a first example to which the inventions of claims (1) and (2) are applied.
The whole structure of the heat storage type air conditioner for exclusive use of the cooling which concerns on an Example is shown, (1) is a compressor, (2) is arrange | positioned outdoors and as a condenser which condenses the refrigerant | coolant discharged from the said compressor (1). A functioning heat source side heat exchanger, (3) a first expansion valve as a main decompression mechanism for decompressing a liquid refrigerant, (4) an indoor side heat utilization side heat exchanger functioning as an evaporator, (5) Is an accumulator for removing the liquid refrigerant in the suction refrigerant, and the above-mentioned devices (1) to (5) are sequentially connected to each other through a refrigerant pipe (6) so that the refrigerant can flow, and by heat exchange with outdoor air. A refrigerant circuit that applies the obtained cold heat to the indoor air is configured.

And the heat storage tank (9) which stores water as a heat storage material is arrange | positioned at an apparatus, The heat-source side heat exchanger (2) of the said main refrigerant circuit (7), and the 1st expansion valve (3). A heat storage heat exchanger (10) for exchanging heat with the water of the heat storage tank (9) is interposed between the heat storage tank (9) and the heat storage tank (9). ) With a forward path (11a) and a return path (11b), a circulation path (11) capable of heat transfer by water circulation is provided. A pump (12) as a forced circulation means that circulates water to forcibly transfer heat is interposed in the outward path (11a).

In addition, between the heat storage heat exchanger (10) and the heat source side heat exchanger (2) of the main refrigerant circuit (7), a second cold storage heat reducing mechanism for reducing the pressure of the refrigerant during the cold storage heat operation is provided. Expansion valve (13)
And a first bypass passage (14) for allowing the refrigerant in the main refrigerant circuit (7) to flow before and after the second expansion valve (13) by bypassing the second expansion valve (13). ing.
The first bypass passage (14) serves as first switching means for switching the flow of the refrigerant in the main refrigerant circuit (7) between the second expansion valve (13) side and the first bypass passage (14) side. The first solenoid on-off valve (15) is interposed.

On the other hand, the refrigerant pipe (6a) between the heat storage heat exchanger (10) of the main refrigerant circuit (7) and the first expansion valve (3) is connected to the suction line (6b).
A second bypass passage (16) for bypassing and connecting the first expansion valve (3) and the utilization side heat exchanger (4) is provided on the side, and the second bypass passage (16) has a second bypass passage. Road (16)
A second opening / closing valve (17) for opening and closing is installed. Further, a third opening / closing valve for opening / closing the main refrigerant circuit (7) is provided between the connection portion of the main refrigerant circuit (7) with the second bypass passage (16) and the first expansion valve (3). (18) is interposed, and the flow of the refrigerant in the main refrigerant circuit (7) is made to flow through the first expansion valve (3) by the second on-off valve (17) and the third on-off valve (18).
Second switching means (30) for switching between the side and the side of the second bypass (16).

A controller (20) as an operation control means for controlling the operation of the entire device is arranged in the device.

Hereinafter, the control of the operation by the controller (20) will be described with reference to FIGS. 1 to 3. During normal cooling operation, the first and third electromagnetic on-off valves (15) (18) open,
The operation is performed with the second electromagnetic on-off valve (17) closed, and the refrigerant condensed in the heat source side heat exchanger (2) is once discharged from the main refrigerant circuit (7) as shown by the arrow in FIG. It flows into the first bypass passage (14), returns to the main refrigerant circuit (7), is decompressed by the first expansion valve (3), is evaporated in the use side heat exchanger (4), and then returns to the compressor (1). Circulate to. At this time, the pump (12) of the circulation path (11) is stopped so that heat is not transferred between the heat storage tank (9) and the heat storage heat exchanger (10).

During cold heat storage operation, the first and third solenoid on-off valves (15), (18)
Is closed and the second electromagnetic on-off valve (17) is opened, and the refrigerant condensed in the heat source side heat exchanger (2) is transferred to the second expansion valve (17) as shown by the arrow in FIG. After being decompressed in 13) and evaporated in the heat storage heat exchanger (10), it is circulated from the second bypass passage (16) to the compressor (1) via the suction line (6b). At this time, the pump (1
2) is operating, and the cold heat applied to the water is transferred to the heat storage tank (9) by heat exchange with the refrigerant in the heat storage heat exchanger (10).

During the cold storage heat recovery cooling operation in which the cold heat stored in the cold storage operation is used for the cooling operation, the first to third electromagnetic on-off valves (15),
The opening and closing of (17) and (18) are made the same as in the above normal cooling operation, that is, as shown in FIG. 3, the pump (12) of the circulation path (11) is operated while the refrigerant circulation path remains the same. Operation is performed, and the cold storage heat of the heat storage tank (9) is stored in the heat storage heat exchanger (10).
By moving the cold heat to the refrigerant,
After supercooling the refrigerant in the main refrigerant circuit (7), the refrigerant is evaporated in the use side heat exchanger (4).

Further, during the cold storage heat recovery cooling operation, by controlling the number of rotations of the pump (12) of the circulation path (11) by the controller (20), the utilization rate of the cold storage heat, the required capacity, the residual cold storage heat,
It is adjusted according to various conditions such as driving time.

As described above, according to the invention of claim (1), the same on-off valves (15), (17), and the same in the normal cooling operation and the cold storage heat recovery cooling operation are used.
Operation is performed while maintaining the open / closed state of (18). That is, when the pump (forced circulation means) (12) of the circulation path (11) operates, heat is transferred from the heat storage tank (9) to the heat storage heat exchanger (10) and stored in the heat storage tank (9). Cold heat is applied to the refrigerant, but if the pump (12) does not operate, the heat storage tank (9)
Since there is no heat transfer between the heat storage heat exchanger (10) and the heat storage heat exchanger (10), the heat stored in the heat storage tank (9) is not added to the refrigerant in the heat storage heat exchanger (10), and the normal cooling operation is performed.

That is, since it is not necessary to switch the circulation path of the refrigerant,
It is possible to select the use or non-use of the cold storage heat according to the operating conditions without changing the state of the refrigerant.
It is possible to improve reliability.

According to the invention of claim (2), the rotational speed of the pump (12) of the circulation path (11), that is, the circulating amount of water is adjusted during the cold storage heat recovery cooling operation in the invention of the above claim (1), and the heat storage tank The utilization rate of the cold storage heat of (9) is adjusted. Therefore, the amount of cold storage heat taken out can be controlled according to the required capacity on the indoor side, the amount of cold storage heat remaining, and the like, which in turn can improve operating efficiency.

Next, a second embodiment according to the invention of claim (3) will be described.

FIG. 4 shows the structure of the heat storage tank (9) in this embodiment,
Water as a heat storage material is stored in the heat storage tank (9), and an ice making coil (19) for making water is provided, the ice making coil (19) and the heat storage heat exchanger (10). )
A circulation path (11) is provided between and.

That is, a heat exchange medium such as brine is circulated in the circulation path (11), and during cold heat storage operation, cold heat obtained by heat exchange with the refrigerant in the heat storage heat exchanger (10) is passed through the heat exchange medium such as brine. Heat is transferred to the heat storage tank (9) side to make water, and during the cold storage heat recovery cooling operation, the cold heat extracted by melting the ice is transferred to the heat storage heat exchanger (10) to supercool the refrigerant. It is done like this. The other configurations are the same as those in the first embodiment.

Therefore, in the invention of claim (3), the ice making coil (19) in the heat storage tank (9) can make not only sensible heat but also cold storage heat using latent heat by making ice in water.
A large amount of cold storage heat can be obtained.

Next, the third embodiment according to the invention of claim (4) will be described. FIG. 5 shows the state in the heat storage tank (9) in this embodiment, and A large number of capsules (21) containing a latent heat storage material having a melting point higher than that of water are incorporated, and water circulates in the circulation path (11) to store the heat storage tank (9) and the heat storage heat exchanger (10). ) Is designed to do heat transfer with. That is, during the cold storage operation,
The cold heat given to the water by heat exchange with the refrigerant solidifies the latent heat storage material in the capsule (21) to store the cold heat, and during the cold storage heat recovery cooling operation, the cold heat obtained by melting the latent heat storage material is given to the refrigerant. Then, the refrigerant is supercooled.

Therefore, in the invention of claim (4), the capsule (21) having the latent heat storage material is incorporated in the heat storage tank (9), so that the ice making coil (19) can be obtained as in the invention of claim (3).
Is not provided in the heat storage tank (9), a high amount of cold storage heat utilizing latent heat can be secured, and therefore, there is an advantage that a high amount of cold storage heat can be maintained with a simple configuration.

(Effect of the invention) As described above, according to the invention of claim (1), in the heat storage type air conditioner in which the heat storage tank for storing the heat storage material is arranged, the cold heat storage and the cold heat recovery are performed in the refrigerant circuit. The heat storage heat exchanger that performs both of the above is used to transfer heat between the heat storage tank and the heat storage heat exchanger through the circulation path.Therefore, the refrigerant is circulated in the normal cooling operation and the cold storage heat recovery cooling operation. Since it is not necessary to switch the path, it is possible to effectively prevent the change of the state of the refrigerant and improve the reliability.

According to the invention of claim (2), in the invention of claim (1), the heat transfer amount in the circulation path is adjusted according to the operating condition during the cold storage heat recovery cooling operation. The utilization rate of the cold storage heat can be controlled according to the remaining amount of the cold storage heat, and the operation efficiency can be improved.

According to the invention of claim (3), in the invention of claim (1) or (2), water is used as the heat storage material, and an ice making coil is provided in the heat storage tank, and the ice making coil and the heat storage heat exchanger are provided. Since a heat exchange medium such as brine was circulated in the circulation path between and, and heat was transferred between the heat storage tank and the heat storage heat exchanger via the heat exchange medium, latent heat of ice making of water was used. A high amount of cold storage heat can be secured.

According to the invention of claim (4), in the invention of claim (1) or (1), a capsule containing a latent heat storage material is built in the heat storage tank, and the heat storage tank and the heat storage heat are provided via a circulation path. Since water is circulated between the heat exchanger and the heat storage tank, it is possible to secure a high amount of cold heat storage using latent heat with a simple structure without providing an ice making coil or the like in the heat storage tank.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 to 3 are refrigerant piping system diagrams showing the overall configuration of an air conditioner and a refrigerant circulation path in each operation mode, and FIG. 1 is a normal cooling system. Operation, FIG. 2 is a cold storage operation, FIG. 3 is a view in cold storage recovery operation, FIG. 4 is a longitudinal sectional view showing the configuration of the heat storage tank in the second embodiment, and FIG. 5 is heat storage in the third embodiment. It is a longitudinal cross-sectional view of the tank. 1 ... Compressor 2 ... Heat source side heat exchanger 3 ... First electric expansion valve (main decompression mechanism) 4 ... Utilization side heat exchanger 6 ... Refrigerant piping 6b ... Suction line 7 ... Main refrigerant circuit 9 ...... Heat storage tank 10 ...... Heat storage heat exchanger 11 ...... Circulation path 11a ...... Forward path 11b ...... Return path 12 ...... Pump (forced circulation means) 13 ...... Second electric expansion valve (pressure reducing mechanism) 14 ...... 1 by-pass passage 15 …… first electromagnetic on-off valve (first switching means) 16 …… second bypass passage 19 …… ice making coil 20 …… controller (operation control means) 21 …… capsule 30 …… second switching means

Claims (4)

[Claims] 1. A refrigerant circuit (1) in which a compressor (1), a heat source side heat exchanger (2), a main pressure reducing mechanism (3) and a use side heat exchanger (4) are sequentially connected by a refrigerant pipe (6). 7) and a heat storage tank (9) for storing a heat storage material capable of storing cold heat, in a heat storage type air conditioner, wherein the heat source side heat exchanger (2) of the refrigerant circuit (7) and the main pressure reducing mechanism (3). ), A heat storage heat exchanger (10) for exchanging heat with the heat storage medium of the heat storage tank (9), the heat storage heat exchanger (10) and the heat storage tank (9). ) And a circulation path (11) for circulatory connection so that heat can be transferred, forced circulation means (12) interposed in the circulation path (11) for forcibly transferring heat, and heat storage in the refrigerant circuit (7). A cold storage heat reducing mechanism (13) provided between the heat exchanger (10) and the heat source side heat exchanger (2) for reducing the pressure of the refrigerant during cold storage heat in the heat storage heat exchanger (10).
And the refrigerant in the refrigerant circuit (7) to store the cold storage heat reducing mechanism (1
First bypass path (14) for bypassing 3) for circulation
And a first switching means (15) for switching the flow of the refrigerant in the refrigerant circuit (7) to the heat storage decompression mechanism (13) side and the first bypass path (14) side, and the heat storage heat of the refrigerant circuit (7). Exchanger (10)
A second bypass passage (6) for connecting the refrigerant pipe (6) between the main decompression mechanism (3) and the main decompression mechanism (3) to the suction line (6b) side by bypassing the main decompression mechanism (3) and the use side heat exchanger (4). 16)
And a second switching means (30) for switching the flow of the refrigerant in the refrigerant circuit (7) between the main pressure reducing mechanism (3) side and the second bypass path (16) side, and during the cold storage heat operation, the forced operation is performed. The circulation means (12) is operated, and the refrigerant is decompressed by the decompression mechanism (13) for heat storage, evaporated in the heat storage heat exchanger (10) and returned to the compressor (1) via the second bypass passage (16). As described above, during the cold storage heat recovery operation, the forced circulation means (12) is operated, and the refrigerant is supercooled in the heat storage heat exchanger (10) through the first bypass passage (14) and is used side heat exchanger (4). In order to evaporate and return to the compressor (1), the forced circulation means (12) is stopped during the normal cooling operation, and the forced circulation is performed so that the refrigerant circulates in the same manner as during the cold heat recovery operation. Operation control means (2) for controlling the means (12) and the first and second switching means (15), (30)
A heat storage type air conditioner characterized by being equipped with 0). 2. The forced circulation means (12) is constructed so that the amount of heat transfer can be adjusted, and the operation control means (20) sets the amount of heat transfer according to the operating conditions during the cold storage heat recovery operation. The heat storage type air conditioner according to claim 1, wherein the forced circulation means (12) is controlled. 3. The heat storage material is water, the heat storage tank (9) is provided with an ice making coil (19) for making water by heat exchange between the water and the heat exchange medium, and the circulation path (11) stores the heat storage heat. Exchanger (10)
And an ice making coil (19) are connected, and a circulation path (1) is provided between the ice making coil (19) and the heat storage heat exchanger (10).
A heat exchange medium such as brine is circulated through 1), and the heat exchange medium is configured to transfer heat between a refrigerant and water. ) Heat storage type air conditioner 4. A heat storage tank (9) contains a capsule (21) containing a latent heat storage material, and a circulation path (11) connects a heat storage heat exchanger (10) with the heat storage tank (9). (11a) and the return path (11b), the heat storage tank (9) and the heat storage heat exchanger (1
0) and a heat exchange medium such as brine circulate through the circulation path (11), and the heat exchange medium causes heat transfer between the refrigerant and the latent heat storage material. The heat storage type air conditioner according to claim (1) or (2).