JP3790207B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner having an ice heat storage tank.
[0002]
[Prior art]
Generally, a heat source side unit having a compressor and a heat source side heat exchanger, an ice heat storage unit in which a coil is disposed in a submerged state in an ice heat storage tank, and a usage side unit having a usage side heat exchanger The air conditioning apparatus which it has is known (for example, refer patent document 1).
[0003]
In this type, the ice heat storage operation is performed by evaporating the refrigerant in the coil to produce ice, and the ice heat storage operation is performed by condensing the refrigerant in the coil and defrosting the ice around the coil. Do.
[0004]
By the way, conventionally, in order to promote heat transfer in the ice heat storage tank, an air supply pipe is provided at the bottom of the ice heat storage tank.
[0005]
During the operation using ice heat storage, air is guided through the pipe into an annular water column formed around the coil by the above ice melting, and an ascending water flow is formed in the water column to accelerate the ice melting speed.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-46434
[Problems to be solved by the invention]
However, in the conventional configuration, in addition to providing the air supply pipe at the bottom of the ice heat storage tank, a support member for fixing the lower part of the coil is provided, which makes it difficult to assemble the ice heat storage tank. There's a problem.
[0008]
Accordingly, an object of the present invention is to solve the problems of the conventional techniques described above, enable air supply to the whole with a simple configuration, and promote air transfer in an ice heat storage tank. To provide an apparatus.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 performs ice heat storage by evaporating the refrigerant in the coil and making ice, and uses ice heat storage by condensing the refrigerant in the coil and defrosting the ice around the coil. In the air conditioner including an ice heat storage tank, a plurality of bottom members are arranged side by side at the bottom of the ice heat storage tank, air supply means is provided on at least one bottom member, and the air supply means is provided on the bottom member. A support member having an air storage part for storing air supplied through is spanned, and an air supply hole is formed in the support member so as to be able to introduce air around the coil in communication with the air storage part. It is what.
[0010]
The invention according to claim 2 includes a heat source side unit including a compressor and a heat source side heat exchanger, an ice heat storage unit in which a coil is disposed in a submerged state in an ice heat storage tank, and a use side heat exchanger. Ice storage by making the ice in the coil by evaporating the refrigerant in the coil and condensing the refrigerant in the coil to defrost the ice around the coil. A plurality of bottom members are arranged side by side at the bottom of the ice heat storage tank, air supply means is provided on at least one bottom member, and the air is supplied to the bottom member through the air supply means. A support member having an air storage part for storing air is passed over, and an air supply hole is formed in the support member so as to be able to introduce air around the coil in communication with the air storage part. is there.
[0011]
According to a third aspect of the present invention, in the first or second aspect, the lower portion of the coil extends into the lower space of the support member.
[0012]
According to a fourth aspect of the present invention, in any one of the first to third aspects, the bottom member having the air supply means and the support member are each formed of a box-shaped member having an open bottom surface, and the coil is supported. It is fixed to the side wall of the member.
[0013]
According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a partition that divides the air reservoir is provided inside the support member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows an air conditioner equipped with an ice heat storage unit to which an embodiment of an air conditioner equipped with a heat storage unit according to the present invention is applied, and is a pipeline diagram during ice making operation. FIG. 2 is a pipeline diagram during the cooling operation in the embodiment of FIG.
[0016]
The air conditioner 10 shown in FIGS. 1 and 2 includes a heat source side unit 11, an ice heat storage unit 12 as a heat storage unit, and a use side unit 13. The refrigerant pipes 14 of the heat source unit 11 and the refrigerant pipes 15A and 15B connecting the refrigerant pipes 30, 31 and 32 arranged in parallel of the use side unit 13 are connected by the refrigerant pipes 16 and 17 of the ice heat storage unit 12. The The refrigerant pipe 15 </ b> A is connected to the refrigerant pipe 16, and the refrigerant pipe 15 </ b> B is connected to the refrigerant pipe 17.
[0017]
In the heat source side unit 11, variable capacity compressors 18A, 18B, 18C are arranged in parallel with the refrigerant pipe 14, an accumulator 19 is provided on the suction side of these compressors 18A, 18B, and 18C, and a four-way valve is provided on the discharge side. The heat source side heat exchanger 21, the electric expansion valve 22, and the receiver tank 23 are sequentially connected to the four-way valve 20 via the refrigerant pipe 14.
[0018]
In the usage-side unit 13, usage-side heat exchangers 24, 25, and 26 are disposed in the refrigerant pipes 30, 31, and 32, respectively, and the usage-side heat exchangers 24, 25, and 26 are provided in the refrigerant pipes 30, 31, and 32. Electric expansion valves 27, 28, and 29 are arranged in the vicinity. The opening degree of these electric expansion valves 27, 28, and 29 is adjusted according to the air conditioning load.
[0019]
The ice heat storage unit 12 includes an ice heat storage tank 36 as a heat storage tank containing the coil 35, and a receiver tank 37, an electric expansion valve 38, and a first electric open / close valve 41 are provided on the refrigerant source 16 side of the heat source side unit 11. To the use side unit 13 sequentially. In addition, one end of a coil 35 is connected to the refrigerant pipe 16 via a connection pipe 39 between the electric expansion valve 38 and the first electric open / close valve 41. The other end of the coil 35 is connected to the refrigerant pipe 17 of the ice heat storage unit 12 via the connection pipe 40, and the second electric opening / closing valve 42 is disposed in the connection pipe 40. Furthermore, one end of a connection pipe 44 having a third electric opening / closing valve 43 is connected to the refrigerant pipe 16 between the receiver tank 37 and the electric expansion valve 38. The other end of the connection pipe 44 is connected between the second electric on-off valve 42 and the coil 35 in the connection pipe 40.
[0020]
The ice heat storage tank 36 is filled with water as a secondary medium, and the coil 35 is disposed in a submerged state. At the time of ice making operation as the heat storage operation of the air conditioner 10, the liquid refrigerant as the primary medium from the heat source side heat exchanger 21 flows into the coil 35 and evaporates, whereby ice adheres to the outer periphery of the coil 35. In this way, cold energy is stored in this ice. During the ice-free cooling operation as the heat dissipation operation of the air conditioner 10, the liquid refrigerant from the heat source side heat exchanger 21 flows into the coil 35 in a full state, and this liquid refrigerant removes ice adhering to the outer periphery of the coil 35. It is melted and becomes supercooled by the heat radiation of the cold stored in the ice.
[0021]
[A] Ice making operation (Figure 1)
In the ice making operation of the air conditioner 10 shown in FIG. 1, for example, the liquid refrigerant from the heat source side heat exchanger 21 in the heat source side unit 11 is stored in ice during a time when the electricity rate from 10:00 to 8:00 the next morning is low. This is an operation for supplying ice to the coil 35 in the ice heat storage tank 36 in the unit 12 and making ice in the ice heat storage tank 36.
[0022]
In this case, in the ice heat storage unit 12, the first electric on-off valve 41 and the third electric on-off valve 43 are closed, and the electric expansion valve 38 and the second electric on-off valve 42 are opened. Further, the electric expansion valves 27, 28 and 29 of the use side unit 13 are closed. In this state, when the compressors 18A, 18B, 18C of the heat source side unit 11 are started, the gas refrigerant discharged from these compressors 18A, 18B, 18C is condensed in the heat source side heat exchanger 21, The pressure is reduced through the electric expansion valve 22 and the electric expansion valve 38 of the ice heat storage unit 12 and flows into the coil 35 in the ice heat storage tank 36. The refrigerant flowing into the coil 35 is evaporated and formed in a state where ice is attached to the outer periphery of the coil 35. Thereafter, the gas refrigerant in the coil 35 reaches the four-way valve 20 through the connection pipe 40, the second electric opening / closing valve 42 and the refrigerant pipe 17, and is returned to the compressors 18A, 18B, 18C through the accumulator 19.
[0023]
Ice is formed in the ice heat storage tank 36 by this ice making operation, and the cold energy stored in the ice is used for the next ice-freezing and cooling operation.
[0024]
[B] Ice-free cooling operation (Figure 2)
The ice-freezing and cooling operation of the air conditioner 10 shown in FIG. 2 is performed by, for example, liquid refrigerant from the heat source side heat exchanger 21 in the heat source side unit 11 and ice in the ice heat storage unit 12 during the daytime when the temperature rises. This is performed by supplying the coil 35 in the heat storage tank 36 to a supercooled state and supplying the supercooled liquid refrigerant to the use side heat exchangers 24, 25, 26 of the use side unit 13.
[0025]
In this case, in the ice heat storage unit 12, the second electric on-off valve 42 is closed, the first electric on-off valve 41 and the third electric on-off valve 43 are opened, and the opening degree of the electric expansion valve 38 is described later. It is adjusted as follows. Further, the electric expansion valves 27, 28 and 29 of the use side unit 13 are opened.
[0026]
In this state, when the compressors 18A, 18B, 18C of the heat source side unit 11 are started, the gas refrigerant discharged from these compressors 18A, 18B, 18C is condensed in the heat source side heat exchanger 21, It flows into the coil 35 in the ice heat storage tank 36 through the electric expansion valve 22, the refrigerant pipe 16 of the ice heat storage unit 12, the connection pipe 44, and the third electric opening / closing valve 43. The liquid refrigerant that has flowed into the coil 35 flows in the coil 35 in a full state, defrosts the ice adhering to the outer periphery of the coil 35, and becomes supercooled by the cold heat stored in the ice. Thereafter, the supercooled liquid refrigerant in the coil 35 is used via the connection pipe 39, the first electric opening / closing valve 41 and the refrigerant pipe 16, and the refrigerant pipe 15 </ b> A and the electric expansion valves 27, 28, 29 of the use side unit 13. The refrigerant flows into the side heat exchangers 24, 25, and 26, and evaporates by each of the use side heat exchangers 24, 25, and 26 to cool the room.
[0027]
Thereafter, the gas refrigerant passes through the refrigerant pipes 30, 31, 32 and the refrigerant pipe 15B, passes through the refrigerant pipe 17 of the ice heat storage unit 12, passes through the four-way valve 20 and the accumulator 19, and then is returned to the compressors 18A, 18B and 18C. .
[0028]
Therefore, during this ice-freezing cooling operation, the cold heat stored in the ice in the ice heat storage tank 36 in the ice making operation described above is used, and the liquid refrigerant is supercooled in the coil 35 of the ice heat storage tank 36 to use side heat. Since it supplies to replacement | exchange 24,25,26, the efficiency of the cooling operation in these utilization side heat exchangers 24,25,26 can be improved.
[0029]
Further, in the ice-freezing cooling operation described above, in the ice heat storage unit 12, the liquid refrigerant temperature E <b> 1 flowing into the refrigerant pipe 16 on the first electric on-off valve 41 side from the coil 35 via the connection pipe 39 is When the liquid refrigerant temperature E2 in the use side heat exchangers 24, 25, 26 is lower than the liquid refrigerant temperature E2, the opening degree of the electric expansion valve 38 is adjusted, and the liquid refrigerant supercooled by the coil 35 in the ice heat storage tank 36 is obtained. The liquid refrigerant from the heat source side heat exchanger 21 and the electric expansion valve 22 is merged, and the merged liquid refrigerant is supplied to the use side heat exchangers 24, 25, and 26. In such an ice-free cooling operation, the liquid refrigerant from the heat source side heat exchanger 21 and the electric expansion valve 22 has a higher temperature than the liquid refrigerant supercooled in the coil 35, and therefore the use side heat exchanger 24. , 25, 26, the temperature of the liquid refrigerant flowing to the interior, 25, 26 is raised to optimize the indoor cooling operation by the use side heat exchangers 24, 25, 26.
[0030]
"C" normal cooling operation (Fig. 2)
The normal cooling operation in the air conditioner 10 shown in FIG. 2 is a cooling operation that is performed without using the cold energy stored in the ice in the ice heat storage tank 36 in the ice heat storage unit 12, and the second electric on-off valve 42 and The third electric on-off valve 43 is closed, and the electric expansion valve 38 and the first electric on-off valve 41 are opened. Further, the electric expansion valves 27, 28 and 29 in the use side unit 13 are opened.
[0031]
In this state, when the compressors 18A, 18B, 18C of the heat source side unit 11 are started, the gas refrigerant discharged from these compressors 18A, 18B, 18C is condensed in the heat source side heat exchanger 21, The use side heat passes through the electric expansion valve 22, the refrigerant pipe 16 of the ice heat storage unit 12, the electric expansion valve 38 and the first electric opening / closing valve 41, and through the refrigerant pipe 15 </ b> A of the use side unit 13 and the electric expansion valves 27, 28 and 29. The refrigerant flows into the exchangers 24, 25, and 26, evaporates by each of the use-side heat exchangers 24, 25, and 26, cools the room, passes through the refrigerant pipe 15B, and passes through the refrigerant pipe 17 of the ice heat storage unit 12. After passing through the four-way valve 20 and the accumulator 19, it is returned to the compressors 18A, 18B, 18C.
[0032]
“D” Structure of Ice Storage Tank 36 According to the Present Embodiment FIG. 3 shows a part of the internal structure of the ice storage tank 36. The ice heat storage tank 36 is filled with water, and the coil 35 (FIG. 1) arranged in a meandering manner is provided with its upper end portion 35A protruding above the water surface. During the ice making operation, the ice is stored by evaporating the refrigerant in the coil 35 and making ice, and during the ice opening operation, the refrigerant is condensed in the coil 35 and the ice around the coil 35 is defrosted to store the ice. Make use. At the time of this ice melting, as shown in FIG. 5, the ice 100 around the coil 35 is melted, and an annular water column 91 is formed around the coil 35 by this ice melting.
[0033]
In the present embodiment, as shown in FIG. 4, a plurality of bottom members 111 are arranged side by side at the bottom of the ice heat storage tank 36, and air supply means (pipe) 95 is provided to at least one of the bottom members 111 </ b> A. Is provided.
[0034]
On these bottom members 111 and 111A, a plurality of support members 93 having an air storage portion 92 for storing the air supplied through the pipe 95 are spanned so as to be substantially orthogonal to the bottom member 111. Yes.
[0035]
Each of the bottom members 111 and 111A and the support member 93 is a box-shaped member having an open bottom surface. When air is supplied through the pipe 95, air is first stored in one bottom member 111A. Next, air is uniformly distributed and stored in the air storage portions 92 of all the support members 93 through the through holes 113 formed on the upper surface of the bottom member 111A.
[0036]
The straight pipe portion 35B of the meandering coil 35 is fixed to the side wall 96 of the support member 93 by using a fixture 97, and the curved pipe portion (lower portion) 35C of the coil 35 extends into the lower space 94 of the support member 93. I'm out. An air supply hole 98 composed of a fine hole is formed in the vicinity of the fixture 97, and the air supply hole 98 communicates with the air storage portion 92 and is formed so that air can be introduced around the straight pipe portion 35 B of the coil 35. ing.
[0037]
In the present embodiment, during the ice making operation described above, ice 100 is made around the coil 35 as shown in FIG. In this case, since the upper end portion 35A of the coil 35 protrudes above the water surface, ice is not made around the upper end portion 35A.
[0038]
Next, when the above-described ice melting operation is executed, as shown in FIG. 5, first, the ice around the coil 35 is melted, and an annular water column 91 is formed around the coil 35 by this ice melting. Further, the air supply hole 98 formed in the side wall 96 of the support member 93 by this ice melting communicates with the water column 91, and the air bubbles 101 are supplied into the water column 91 as shown in FIG. When the bubbles 101 are supplied to the water column 91, the bubbles 101 rise in the water column 91 and are exhausted to the outside from the vicinity of the upper end portion 35A of the coil 35 protruding on the water surface. According to this, since an ascending water flow is generated in the water column 91, the heat transfer property is improved and the ice melting speed is promoted.
[0039]
In the present embodiment, the following effects (1) to (5) are obtained.
[0040]
(1) Since the support member 93 serves as a so-called air supply pipe and a support member for fixing the lower portion 35C of the coil 35, the piping structure is simplified, the cost can be reduced, and the ice heat storage tank 36 can be easily assembled. become.
[0041]
(2) When air is supplied through the pipe 95, air is first stored in one bottom member 111A, and then air is stored in all the support members 93 through the through holes 113 formed in the upper surface of the bottom member 111A. Since air is supplied to the portion 92, air is uniformly stored in all the support members 93.
[0042]
{Circle around (3)} Since the coil 35 and the air storage portion 92 do not intersect with each other as in the prior art, a sealing function is not required and uniform evacuation is performed.
[0043]
(4) Since the coil 35 is fixed to the side wall 96 of the support member 93, the ice around the side wall is melted by the temperature of the coil 35 during the ice-melting operation, and the air supply hole 98 and the water column 91 communicate with each other. . Therefore, unlike the conventional case, it is not necessary to provide new ice melting means for communication, and the piping structure is simplified.
[0044]
(5) Even if the size of the ice heat storage tank 36 is different, the support member 93 can be shared because a plurality of support members 93 can be combined.
[0045]
FIG. 6 shows another embodiment.
[0046]
According to this, the partition 103 which extends in the short direction and divides the air reservoir 92 into a plurality of parts is provided inside the support member 93.
[0047]
A height H1 of the partition 103 is formed to be lower than a height H2 of the support member 93. When the support member 93 is installed in the ice heat storage tank 36, the support member 93 is inclined and installed. The amount of air stored in each of the chambers A to C is kept constant by the height H1 of the partition body 103.
[0048]
Therefore, in each of the chambers A to C, there is no extreme difference in how the bubbles 101 come out, and almost uniform evacuation is possible.
[0049]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this. For example, in the above-described embodiment, the support member is configured by a box-shaped member having an open bottom surface. However, the present invention is not limited to this, and various forms can be applied without departing from the gist of the present invention. Absent.
[0050]
【The invention's effect】
In the present invention, since the support member serves as a so-called air supply pipe and a support member for fixing the coil, the piping structure is simplified, the cost can be reduced, and the ice heat storage tank can be easily assembled.
[Brief description of the drawings]
FIG. 1 is a pipe diagram showing an air conditioner equipped with an ice heat storage unit to which an embodiment of an air conditioner equipped with a heat storage unit according to the present invention is applied, during ice making operation.
FIG. 2 is a pipeline diagram during cooling operation in the embodiment of FIG. 1;
FIG. 3 is a cross-sectional view of an ice heat storage tank.
FIG. 4 is a cross-sectional perspective view of an ice heat storage tank.
FIG. 5 is a cross-sectional view showing ice around a coil.
FIG. 6 is a perspective view of a support member showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus 11 Heat source side unit 12 Ice heat storage unit 13 Use side unit 21 Heat source side heat exchanger 24 Use side heat exchanger 35 Coil 36 Ice heat storage tank 91 Water column 92 Air storage part 93 Support member 94 Lower space 95 Pipe (Air Supply means)
96 Side wall 97 Fixing tool 98 Air supply hole 111, 111A Bottom member

Claims (5)

Air conditioning with an ice storage tank that performs ice heat storage by evaporating the refrigerant in the coil and making ice, and condensing the refrigerant in the coil to defrost the ice around the coil. In the device
A plurality of bottom members are arranged side by side at the bottom of the ice heat storage tank,
Air supply means is provided on at least one bottom member;
A support member having an air storage part for storing the air supplied through the air supply means is placed on the bottom member,
An air conditioner characterized in that an air supply hole is formed in the support member so as to be able to introduce air around the coil in communication with the air storage section. A heat source side unit including a compressor and a heat source side heat exchanger, an ice heat storage unit in which a coil is disposed in a submerged state in an ice heat storage tank, and a utilization side unit including a utilization side heat exchanger ,
In the air conditioner that performs ice heat storage by evaporating the refrigerant in the coil and making ice, and condensing the refrigerant in the coil and defrosting the ice around the coil to use ice heat storage,
A plurality of bottom members are arranged side by side at the bottom of the ice heat storage tank,
Air supply means is provided on at least one bottom member;
A support member having an air storage part for storing the air supplied through the air supply means is placed on the bottom member,
An air conditioner characterized in that an air supply hole is formed in the support member so as to be able to introduce air around the coil in communication with the air storage section. The air conditioner according to claim 1 or 2, wherein a lower portion of the coil extends into a lower space of the support member. The bottom member and the support member having the air supply means are each formed of a box-shaped member having an open bottom surface, and the coil is fixed to a side wall of the support member. The air conditioning apparatus described. The air conditioner according to claim 4, wherein a partition that divides the air reservoir is provided inside the support member.

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