JP4046477B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner including a heat storage unit.
[0002]
[Prior art]
Generally, a heat source side unit provided with a compressor and a heat source side heat exchanger, a machine room containing a receiver tank, piping, etc., an ice heat storage tank, an ice heat storage unit provided with a coil, and a use side heat exchanger 2. Description of the Related Art An air conditioner having a use side unit provided is known. In this type of air conditioner, the heat source side unit and the ice heat storage unit are often arranged in a narrow space such as a rooftop, and it is an important development theme to reduce the installation space.
[0003]
[Problems to be solved by the invention]
The conventional ice heat storage unit is equipped with an ice heat storage tank and a coil placed in a submerged state in this tank, and further accommodates a large receiver tank, piping, etc. There is a problem of doing.
[0004]
On the other hand, in the heat source side unit, the compressor is generally disposed at the center thereof, and generally U-shaped heat source side heat exchangers are disposed facing each other so as to surround the compressor on the left and right sides thereof. . In this case, the refrigerant pipe including the accumulator is tightly accommodated in the inner space of one heat source side heat exchanger with almost no gap, but almost nothing is accommodated in the inner space of the other heat source side heat exchanger. Is the current situation. Therefore, in the conventional heat source side unit, the side on which one heat source side heat exchanger is arranged becomes heavy, the weight balance becomes worse, and when lifting when transporting the heat source side unit, it is difficult to lift and transport it. is there.
[0005]
An object of the present invention is to eliminate the problems with the prior art described above, provides an air conditioning system installation space of equipment such that Ru is reduced in the roof or the like.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a heat source side unit including a compressor and a heat source side heat exchanger, a machine room storing a receiver tank, piping, and the like, a heat storage tank, and a heat storage unit including a coil, and use In the air conditioner having a use side unit equipped with a side heat exchanger, the heat storage unit has two upper and lower chambers, a heat storage tank and a coil are arranged in the lower chamber, and the upper chamber is the It is configured as a machine room, the width dimension of the upper chamber is formed smaller than the width dimension of the lower chamber, a ladder reaching the upper surface of the lower chamber is disposed, and further, on the upper surface of the lower chamber An internal inspection port of the heat storage tank is formed, and a canopy is disposed in the internal inspection port.
[0007]
In the present invention, since the ice heat storage units are formed in two upper and lower stages, the installation space is reduced as compared with the side by side. Therefore, even when the heat source side unit and the ice heat storage unit are arranged in a narrow space such as a rooftop, the installation space is small and a wide space is obtained between the units. Therefore, in the case of an air cooling type, heat exchange efficiency can be improved.
[0008]
A second aspect of the present invention is the heat source side heat exchanger according to the first aspect, wherein the heat source side unit has a substantially U-shaped heat exchanger disposed so that a compressor is disposed at a substantially central portion and the compressors are surrounded on the left and right sides thereof. placed face to face, the refrigerant piping including accumulator inside space of one of the heat source side heat exchanger is disposed, the receiver tank to be disposed in the machine room to the inside space of the other of the heat source-side heat exchanger It is characterized by the arrangement.
[0009]
In the present invention, the refrigerant pipe or the like is arranged in the inner space of one heat source side heat exchanger, and the receiver tank to be arranged in the machine room is arranged in the inner space of the other heat source side heat exchanger. Can be balanced.
[0010]
Therefore, when the heat source side unit is lifted when it is transported, the lifting and transporting can be easily performed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows an air conditioner including an ice heat storage unit to which an embodiment of an air conditioner according to the present invention is applied, and is a pipe diagram during ice making operation. FIG. 2 is a pipeline diagram during the cooling operation in the embodiment of FIG.
[0013]
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.
[0014]
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 tanks 23A, 23 are sequentially connected to the four-way valve 20 via the refrigerant pipe 14.
[0015]
The receiver tank 23 is the one that has been connected to the refrigerant pipe 16 of the ice heat storage unit 12 in the past and transferred to the heat source side unit 11, and is connected in series with the receiver tank 23A that originally existed.
[0016]
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.
[0017]
The ice heat storage unit 12 includes an ice heat storage tank 36 as a heat storage tank containing the coil 35, and an electric expansion valve 38 and a first electric opening / closing valve 41 are provided on the refrigerant pipe 16 from the heat source side unit 11 side to the use side unit. 13 are arranged 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 on-off valve 43 is connected to the refrigerant pipe 16 between the receiver tank 23 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.
[0018]
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.
[0019]
[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.
[0020]
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.
[0021]
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.
[0022]
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.
[0023]
[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.
[0024]
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.
[0025]
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.
[0026]
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. .
[0027]
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.
[0028]
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.
[0029]
"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.
[0030]
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.
[0031]
In the present embodiment, as shown in FIG. 3, the ice heat storage unit 12 is formed in two upper and lower stages. In the lower chamber A, an ice heat storage tank 36 and a water circumference such as a coil 35 disposed in a submerged state are arranged.
[0032]
The coil 35 is formed in a multi-pass state by four distributors 75 and a collecting pipe 76 and is supported by a frame 73 in the tank. The frame 73 includes an upper frame 77 that holds the upper portion of the coil 35 horizontally, a lower frame 79 that holds the U-shaped bent portion 78 below the coil 35 horizontally, and a vertical frame 80 that connects the upper and lower frames 77, 79. It consists of and.
[0033]
In addition, a machine room B is arranged in the upper stage, and although not shown in this machine room B, the electric expansion valve 38, the first electric on-off valve 41, the connection pipe 39, the connection pipe 40, the refrigerant pipe of FIG. 17, pipes including the second electric on-off valve 42, the refrigerant pipe 16, the third electric on-off valve 43, the connection pipe 44, and the like are arranged.
[0034]
This machine room B is formed smaller in width than the lower room A, and an internal inspection port of the ice heat storage tank is formed in a part of the top plate of the room A, and a canopy 68 is disposed there. Yes. 100 is a ladder.
[0035]
According to the said structure, since the ice thermal storage unit 12 is formed in two steps of upper and lower sides, an installation space is reduced compared with the side-by-side thing. Therefore, even when the heat source side unit 11 and the ice heat storage unit 12 are arranged in a narrow space such as a rooftop, the installation space is small and a wide space is obtained between the units. Therefore, in the case of an air cooling type, heat exchange efficiency can be improved.
[0036]
In the present embodiment, with reference to FIG. 1, the two receiver tanks 23 </ b> A and 23 are collectively arranged in the heat source unit 11.
[0037]
In the air conditioner using this kind of ice heat storage unit 12, a large amount of refrigerant is required, and large-sized receiver tanks 23A and 23 are necessary to temporarily store the surplus refrigerant due to the operating state. Conventionally, one receiver tank 23 is arranged in the ice heat storage unit 12, but in the present embodiment, it is arranged in the heat source side unit 11 as described above.
[0038]
As shown in FIGS. 4 and 5, the heat source side unit 11 is provided with a machine room 11A containing three compressors 18A, 18B, 18C, etc. in the approximate center of the unit, and substantially U-shaped on both sides thereof. And a heat exchange chamber 11B in which the heat source side heat exchanger 21 is stored facing each other. 7 is a blower.
[0039]
Although not shown, the refrigerant pipe including the accumulator 19 is closely arranged in the inner space of one heat source side heat exchanger 21 with almost no gap, and the other heat source side heat exchanger 21 has a wide inner side. The receiver tanks 23A and 23 are disposed in the space. 8 is an electrical equipment box.
[0040]
In this configuration, the weight of the refrigerant pipe including the accumulator 19 and the weight of the receiver tanks 23 </ b> A and 23 are balanced to achieve a weight balance as a whole of the heat source side unit 11. Accordingly, when the heat source side unit 11 is lifted during the transfer, the lifting transfer and the like are facilitated.
[0041]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0042]
【The invention's effect】
In the invention according to claim 1, since the ice heat storage units are formed in two stages, upper and lower, the installation space is reduced as compared with the horizontally arranged units. Therefore, even when the heat source side unit and the ice heat storage unit are arranged in a narrow space such as a rooftop, the installation space is small and a wide space is obtained between the units. Therefore, in the case of an air cooling type, heat exchange efficiency can be improved.
[0043]
In the invention according to the second aspect, the weight balance can be achieved as the whole heat source side unit. Accordingly, when the heat source side unit is lifted during the transfer, the lifting transfer is facilitated.
[Brief description of the drawings]
FIG. 1 shows an air conditioner equipped with an ice heat storage unit according to the present invention, and is a pipeline diagram 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 a heat storage unit.
FIG. 4 is a side cross-sectional view of a heat source side unit.
FIG. 5 is a plan sectional view of a heat source side unit.
[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 A Lower chamber B Machine room

Claims (2)

A heat source unit provided with a compressor and a heat source side heat exchanger, a machine room containing piping and the like, a heat storage tank, a heat storage unit provided with a coil, and a use side unit provided with a use side heat exchanger; In an air conditioner having
The heat storage unit has two upper and lower chambers, a heat storage tank and a coil are disposed in the lower chamber, and the upper chamber is configured as the machine chamber,
The width dimension of the upper chamber is formed smaller than the width dimension of the lower chamber,
A ladder reaching the upper surface of the lower chamber is disposed, and further, an internal inspection port of the heat storage tank is formed on the upper surface of the lower chamber, and a canopy is disposed in the internal inspection port. Air conditioner to do. The heat source side unit has the compressor arranged at substantially the center thereof, and the left and right sides of the heat source side heat exchanger are arranged facing each other so as to surround the compressor, and one heat source side heat exchange is arranged. vessels refrigerant piping disposed including accumulator inside space, according to claim 1, characterized in that a said receiver tank to be disposed in the machine room to the inside space of the other of the heat source-side heat exchanger Air conditioner.

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