JP2705033B2 - Multi-room air conditioner - Google Patents

Description

The present invention relates to a refrigeration cycle control for simultaneously performing a cooling operation and a heating operation for each room in a multi-room air conditioner using air as a heat source, and heat storage. The present invention relates to a heat pump type air conditioner provided with control for use.

2. Description of the Related Art A conventional multi-room air conditioner having a plurality of indoor units includes, as shown in FIG.
After connecting the four-way valve 3, the outdoor heat exchanger 4, and the outdoor expansion valve 5, the indoor expansion valve 7 in the indoor unit 6 installed in parallel, and the indoor heat exchanger 8 in parallel, The heat pump type refrigeration cycle is configured by being sequentially connected in a ring shape. Compressor 2
Is variable in capacity, and its capacity can be changed by changing the frequency of the supplied power. The four-way valve 3 switches between the cooling operation and the heating operation. During the cooling operation, the refrigerant flows in the direction of the solid line arrow in the figure to form a cooling cycle. During the heating operation, the refrigerant flows in the direction of the broken line in the figure. A heating cycle is formed. In addition, the outdoor heat exchanger 4, and
The indoor heat exchanger 8 is provided with an outdoor blower 9 and an indoor blower 10 in close proximity to each other.

In such a multi-room air conditioner, a plurality of, for example, three indoor units 6a, 6b, 6c can be individually operated, and when only the indoor unit 6a is operated, the other indoor units 6b , 6c
, The indoor expansion valves 7b and 7c are closed frontward, and the indoor blowers 10b and 10c are also stopped. At this time, the compressor 2 performs capacity control by an inverter or the like, and can be operated with a capacity corresponding to the number of operating indoor units.

Problems to be Solved by the Invention However, in the above-described conventional example, the operation mode of the indoor unit 6 is set to the same mode for all three rooms. For example, even in winter, two rooms perform heating operation,
One room had a drawback that it wanted to perform cooling operation and could not meet the needs of simultaneous operation of heating and cooling. In addition, since the power used is daytime power mainly used by air conditioners, the peak of power consumption at the time of high load is extremely high even from a social perspective that the use of electronic devices is increasing year by year. Not only can it be in a state,
There was a drawback that the power consumption rate was higher because it was more expensive than nighttime power.

Accordingly, it is an object of the present invention to provide an air conditioner with low operating costs by realizing simultaneous operation of heating and cooling by storing heat using nighttime electric power.

Means for Solving the Problems The technical means of the present invention for solving the above problems includes a compressor,
The four-way valve, the outdoor heat exchanger, the outdoor expansion valve, and the refrigerant heat exchanger are sequentially communicated, and further, the first heat storage tank expansion valve and the first heat storage tank, and the second heat storage tank expansion valve and the second heat storage The tanks are communicated in parallel to form a primary refrigeration cycle, wherein the refrigerant heat exchanger comprises a primary heat exchange section and a secondary heat exchange section, and the primary heat exchange section is connected via a switching valve. The first heat storage tank is composed of a primary heat exchanger and a secondary heat exchanger, and the first heat storage tank is filled with a heat storage material. ,
The primary heat exchange section is in communication with the primary refrigeration cycle via a switching valve, and the second heat storage tank is composed of a primary heat exchanger and a secondary heat exchanger. 2 Heat storage material is filled in the heat storage tank,
The primary-side heat exchange unit is in communication with the primary-side refrigeration cycle via a switching valve, between the four-way valve and the outdoor heat exchanger, between the four-way valve and the first heat storage tank, and A bypass circuit is provided in parallel between the valve and the outdoor heat exchanger and between the four-way valve and the second heat storage tank via a bypass valve, respectively, while a secondary heat exchanger in the first heat storage tank is provided. , A first refrigerant transfer pump, a first secondary refrigeration cycle including a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary heat exchanger and a second refrigerant transfer pump in the second heat storage tank. And a second secondary refrigeration cycle comprising a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary refrigeration cycle provided in parallel with the secondary heat cycle of the refrigerant heat exchanger. The exchange unit communicates with the first secondary refrigeration cycle or the second secondary refrigeration cycle via the switching valve. One in which the.

Operation The operation of this technical means is as follows. The compressor, the four-way valve, the outdoor heat exchanger, the outdoor expansion valve, the refrigerant heat exchanger are sequentially communicated, and further, the first heat storage tank expansion valve and the first heat storage tank, and the second heat storage tank expansion valve A second-side heat storage tank is connected in parallel to form a primary-side refrigeration cycle, between the four-way valve and the outdoor heat exchanger, between the four-way valve and the first heat storage tank, and between the four-way valve and the outdoor heat exchanger. In a bypass circuit via a bypass valve in parallel between the heat exchanger and the four-way valve and the second heat storage tank, a primary heat exchange section of the refrigerant heat exchanger using inexpensive nighttime power at night. Is not used, by controlling the outdoor expansion valve, the first heat storage tank expansion valve, and the second heat storage tank expansion valve,
Cold storage or heat storage is performed on the heat storage material in the two heat storage tanks.

On the other hand, in the daytime, basically, the cold storage operation or the heat storage operation in the primary refrigeration cycle is stopped, and the second storage in the first heat storage tank is stopped.
A first secondary refrigeration cycle including a secondary heat exchanger, a first refrigerant transfer pump, and a switching valve provided at the entrance and exit of the indoor heat exchanger; and a secondary heat exchanger in a second heat storage tank. The operation of the secondary refrigeration cycle in which a second refrigerant transport pump and a second secondary refrigeration cycle including a switching valve provided at the entrance and exit of the indoor heat exchanger are formed in parallel. That is, the indoor unit and the first heat storage tank or the second heat storage tank are controlled by controlling the switching valve provided at the entrance / exit of the indoor heat exchanger according to the loads in the plurality of indoors.
Cool storage or heat stored in the heat storage material in each heat storage tank in communication with the heat storage tank is transferred to the indoor heat exchanger by a refrigerant transfer pump to exchange heat (cooling or heating) with indoor air. . Also, in daytime operation, if the indoor load is large and it can not be covered only by cold storage heat by night operation,
Not only the operation of the secondary refrigeration cycle due to cold storage or heat storage, but also the cooling operation or the heating operation in the primary refrigeration cycle is performed at the same time, and the secondary temperature becomes low or high through the refrigerant heat exchanger. The refrigerant in the side refrigeration cycle is transported by a refrigerant transport pump to an indoor unit having a large indoor load, and exchanges heat (cooling or heating) with the indoor air.

With the above operation, not only the simultaneous operation of heating and cooling in the daytime can be performed by the cold storage heat using the nighttime power, but also the load that cannot be covered by the cold storage heat at night can be handled. .

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The same reference numerals are given to the same components as those in the related art, and detailed description thereof will be omitted.

FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner according to one embodiment of the present invention.

The heat pump type air conditioner of this embodiment includes a compressor 2,
An outdoor unit 1 including a four-way valve 3, an outdoor heat exchanger 4, and an outdoor expansion valve 5, a two-way valve KV5, KV6, a primary heat exchange part HE1, and a secondary heat exchange part HE2. The primary heat exchange section HE1 of the refrigerant heat exchanger 17 is sequentially communicated with the first heat exchange section HE1.
X1, a two-way valve KV1, KV2, a first heat storage tank 12 comprising a primary heat exchanger 13a and a secondary heat exchanger 14b filled with a heat storage material 11.
The primary heat exchanger 13a in a and the expansion valve EX for the second heat storage tank
2, a two-way valve KV3, KV4, and a second heat storage tank 12b comprising a primary heat exchanger 13b and a secondary heat exchanger 14b filled with the heat storage material 11.
A primary refrigeration cycle is formed by communicating the primary heat exchanger 13b in parallel with the primary heat exchanger 13b, and the primary refrigeration cycle is formed between the four-way valve 3 and the outdoor heat exchanger 4 and between the four-way valve 3 and the first heat storage tank 12a. A bypass circuit is provided between the four-way valve 3 and the outdoor heat exchanger 4 and between the four-way valve 3 and the second heat storage layer 12b in parallel with the bypass valves BV1 and BV2, respectively. A secondary heat exchanger 14a, a first refrigerant transfer pump 15a, and indoor heat exchangers 8a, 8b, 8c in a first heat storage tank 12a, and a three-way valve Va1, which is provided at each of the entrances and exits, is provided with a total of six valves. A first secondary refrigeration cycle composed of Va2, Vb1, Vb2, Vc1, Vc2, a secondary heat exchanger 14b, a second refrigerant transfer pump 15b, and an indoor heat exchanger in the second heat storage tank 12b
8a, 8b, 8c, a secondary refrigeration cycle including a second secondary refrigeration cycle composed of three-way valves Va1, Va2, Vb1, Vb2, Vc1, Vc2 in parallel, and a refrigerant heat exchanger 17. Secondary heat exchange section HE2
Is connected to the first secondary refrigeration cycle via the three-way valves V1 and V3, or to the second secondary refrigeration cycle via the three-way valves V2 and V4.

 Next, the operation of the configuration of the embodiment will be described.

First, nighttime heat storage / cooling operation (primary refrigeration cycle)
Will be described. The approximate ratio between the cooling load and the heating load on the next day is estimated in advance, and the operation modes of the outdoor unit and the heat storage tank are determined. That is, 1) (total cooling load of indoor unit) ≧ (total heating load of indoor unit)
If = 0, set the outdoor unit: cooling mode and the heat storage tank: cooling mode. 2) (total cooling load of indoor unit) ≧ (total heating load of indoor unit)
If> 0, the outdoor unit is set to the cooling mode, and the heat storage tank is set to the mixed cooling / heating mode.

Conversely, 3) (total heating load of indoor unit)> (total cooling load of indoor unit)
If = 0, set the outdoor unit: heating mode and the heat storage tank: heating mode. 4) (total heating load of indoor unit)> (total cooling load of indoor unit)
If> 0, the outdoor unit is set to the heating mode and the heat storage tank is set to the mixed cooling / heating mode.

In any of the above operation modes, the heat storage tank 12a,
The two-way valve KV1: closed, KV2: open, KV3: closed, KV4: open, KV6: closed so that 12b operates and the refrigerant heat exchanger 17 does not operate, and the refrigerant transport in the secondary refrigeration cycle The pumps 15a and 15b are stopped. The operation of the primary refrigeration cycle in each of the above operation modes will be described below. In addition, regarding the mode of the four-way valve, the compressor discharge side and the outdoor heat exchanger, and the case where the compressor suction side and the heat storage tank communicate with each other, the cooling mode, the compressor discharge side and the heat storage tank, and The case where the suction side of the compressor communicates with the outdoor heat exchanger is defined as a heating mode.

1) Outdoor unit: cooling mode / heat storage tank: cooling mode 4-way valve 3: cooling mode, outdoor expansion valve 5: fully open, KV5: open,
Thermal storage tank expansion valves EX1, EX2: Predetermined opening, bypass valves BV1, BV
2: Close. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the outdoor heat exchanger 4 and decompressed by the first and second heat storage tank expansion valves EX1 and EX2 to be in a liquid or two-phase state. After evaporating and absorbing heat from the heat storage material 11 in the tubes of the primary heat exchanger 13a in the first heat storage tank 12a and the primary heat exchanger 13b in the second heat storage tank 12b (cool storage operation), Return to the outdoor unit 1.

2) Outdoor unit: cooling mode / heat storage tank: mixed cooling / heating mode (first heat storage tank 12a: heat storage, second heat storage tank 12b: cold storage) Four-way valve 3: cooling mode, outdoor expansion valve 5: fully closed, KV5 : Closed,
First heat storage tank expansion valve EX1: Fully open, second heat storage tank expansion valve EX2:
A predetermined opening degree, the bypass valve BV1: open, and BV2: closed. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 does not flow into the outdoor heat exchanger 4 but flows into the first heat storage tank via the bypass valve BV1, and the primary heat in the first heat storage tank 12a. Condensed in the tube of the side heat exchanger 13a and released heat to the heat storage material 11 (heat storage operation).
After being decompressed by the heat storage tank expansion valve EX2 to be in a liquid or two-phase state, after evaporating in the pipe of the primary heat exchanger 13b in the second heat storage tank 12b and absorbing heat from the heat storage material 11 (cooling operation), Return to the outdoor unit 1.

3) Outdoor unit: heating mode / heat storage tank: heating mode Four-way valve 3: heating mode, outdoor expansion valve 5: predetermined opening, KV
5: Open, first heat storage tank expansion valve EX1: fully open, second heat storage tank expansion valve EX2: fully open, bypass valve BV1: closed, BV2: closed. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is supplied to the primary heat exchanger 13a in the first heat storage tank 12a and the second heat storage tank 12b in the second heat storage tank 12a.
After being condensed in the tube of the primary side heat exchanger 13b and radiating heat to the heat storage material 11 (heat storage operation), the pressure is reduced by the outdoor expansion valve 5 to be in a liquid or two-phase state. It evaporates in the pipe and returns to the compressor 2.

4) Outdoor unit: heating mode / heat storage tank: mixed cooling / heating mode (first heat storage tank 12a: cool storage, second heat storage tank 12b: heat storage) Four-way valve 3: heating mode, outdoor expansion valve 5: fully open, KV5: closed,
The first heat storage tank expansion valve EX1: a predetermined opening degree, the second heat storage tank expansion valve EX2: fully open, the bypass valve BV1: closed, and BV2: open. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 does not flow into the outdoor heat exchanger 4 but flows into the second heat storage tank via the bypass valve BV2, and the primary heat of the 12b in the second heat storage tank. After condensing in the tube of the side heat exchanger 13b and releasing heat to the heat storage material 11 (heat storage operation),
The pressure is reduced by the first heat storage tank expansion valve EX1 to be in a liquid or two-phase state, and evaporates in the tube of the primary heat exchanger 13a in the first heat storage tank 12a and evaporates in the first heat storage tank 12a. After the heat is absorbed (cool storage operation), the process returns to the outdoor unit 1.

Next, in the case of daytime operation, in particular, when a secondary refrigeration cycle that does not include a refrigerant heat exchanger is used in daytime operation, that is, when the load of daytime operation can be covered by heat stored by nighttime operation (case A) ) Will be described. The operation modes of the indoor unit are divided into three modes: (I) only the cooling mode, (II) only the heating mode, and (III) the mixed cooling and heating mode. These will be described below. However, it is assumed that cooling and heating operations are performed substantially at the ratio predicted in advance. In the secondary refrigeration cycle, the three-way valves V1, V are connected to the secondary heat exchange part HE2 of the refrigerant heat exchanger 17.
It is set so that the refrigerant does not flow in 2, V3 and V4.

The three-way valves V1, V2, V3, and V4 are set with respect to the secondary heat exchanger HE of the refrigerant heat exchanger 17 in the secondary refrigeration cycle.
The setting in which refrigerant flows into 2 is defined as positive mode, and the setting in which refrigerant does not flow is defined as negative mode. Also, the three-way valves Va1, Va2, Vb1,
Regarding the setting of Vb2, Vc1, Vc2, the indoor heat exchangers 8a, 8b, 8
cDefine the setting in which each communicates with the first heat storage tank 12a as a first mode, and define the setting in communication with the second heat storage tank as a second mode,
The description will be made based on the following definitions.

(I) Indoor unit: only cooling mode In this case, both the first heat storage tank 12a and the second heat storage tank 12b are stored cold, and the indoor units that perform cooling operation using the first heat storage tank are 6a and 6b. The indoor unit performing the cooling operation using the two heat storage tanks is assumed to be 6c. Therefore, the three-way valves Va1, Va2, Vb1, Vb2 are set to the first mode, and Vc1, Vc2 are set to the second mode.

In this state, the refrigerant in the first secondary refrigeration cycle
The first refrigerant transfer pump 15a exchanges heat with the heat storage material 11 which is sent to the secondary heat exchanger 14a in the first heat storage tank 12a and is stored through the secondary heat exchanger 14a. The low-temperature refrigerant is sent to the indoor heat exchangers 8a and 8b, where it exchanges heat with the indoor air (heat absorption) to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant and is stored in the first heat storage tank 12a. Return. The refrigerant in the second secondary refrigeration cycle is sent to the secondary heat exchanger 14b in the first heat storage tank 12b by the first refrigerant transfer pump 15b, Via the heat storage material 1
Heat exchange (radiation) with 1 makes a low-temperature refrigerant, which is sent to the indoor heat exchanger 8c, where it exchanges heat with the indoor air (heat absorption) to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant Return to one heat storage tank 12b. Thus, the cooling operation in the indoor unit is performed.

(II) Indoor unit: only heating mode In this case, both the first heat storage tank 12a and the second heat storage tank 12b are storing heat, and the indoor units performing the heating operation using the first heat storage tank are 6a and 6b, The indoor unit performing the heating operation using the two heat storage tanks is assumed to be 6c. Therefore, the three-way valves Va1, Va2, Vb1, Vb2 are set to the first mode, and Vc1, Vc2 are set to the second mode.

In this state, the refrigerant in the first secondary refrigeration cycle
The first refrigerant transfer pump 15a exchanges heat (heat absorption) with the heat storage material 11 sent to the secondary heat exchanger 14a in the first heat storage tank 12a and stored through the secondary heat exchanger 14a. Becomes a high-temperature refrigerant,
The refrigerant is sent to the indoor heat exchangers 8a and 8b, where it exchanges heat with the indoor air (heat radiation) to heat the indoor air, and the refrigerant itself becomes a low-temperature refrigerant and returns to the first heat storage tank 12a. The refrigerant in the second secondary refrigeration cycle is supplied to the first refrigerant transfer pump 15.
At b, it is sent to the secondary heat exchanger 14b in the first heat storage tank 12b and exchanges heat (absorbs heat) with the heat storage material 11 stored through the secondary heat exchanger 14b to become a high-temperature refrigerant, Indoor heat exchanger 8c
Where the refrigerant exchanges heat with the indoor air (heat radiation) to heat the indoor air, and the refrigerant itself becomes a low-temperature refrigerant and becomes the first refrigerant.
Return to the heat storage tank 12b. Thus, the heating operation in the indoor unit is performed.

(III) Hybrid cooling / heating mode First, the case of the first heat storage tank 12a: cool storage and the second heat storage tank 12b: heat storage will be described. The indoor units that perform the cooling operation using the first heat storage tank are 6a and 6b, and the indoor units that perform the heating operation using the second heat storage tank are 6c. Therefore, the three-way valves Va1, Va2, Vb1,
Vb2: First mode, Vc1, Vc2: Second mode.

In this state, the refrigerant in the first secondary refrigeration cycle
The first refrigerant transport pump 15a exchanges heat (heat radiation) with the heat storage material 11 which is sent to the secondary heat exchanger 14a in the first heat storage tank 12a and stored through the secondary heat exchanger 14a. Becomes a low-temperature refrigerant,
The refrigerant is sent to the indoor heat exchangers 8a and 8b, where it exchanges heat with indoor air (heat absorption) to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant and returns to the first heat storage tank 12a. On the other hand, the refrigerant in the second secondary refrigeration cycle is
At b, it is sent to the secondary heat exchanger 14b in the second heat storage tank 12b and exchanges heat (heat absorption) with the heat storage material stored through the secondary heat exchanger 14b to become a high-temperature refrigerant. The refrigerant is sent to the inner heat exchanger 8c, where it exchanges heat with the indoor air (heat radiation) to heat the indoor air, and the refrigerant itself becomes a low-temperature refrigerant and returns to the second heat storage tank 12b. Thus, the cooling operation is performed in the first secondary refrigeration cycle, and the heating operation is performed in the second secondary refrigeration cycle.

Conversely, in the case of the first heat storage tank 12a: heat storage and the second heat storage tank 12b: cold storage, heating operation is performed using the first heat storage tank and cooling operation is performed using the second heat storage tank. The operation of the cooling operation is the same as described above.

On the other hand, a description will be given of a case where the operation is performed in a refrigeration cycle using the refrigerant heat exchanger 17 in the daytime operation, that is, a case where the load of the daytime operation is large and the heat storage by the nighttime operation cannot be sufficient (case B). Again,
It is basically the same as Case A, except for the primary refrigeration cycle operation using the refrigerant heat exchanger 17, and
That is, a secondary refrigeration cycle operation using the refrigerant heat exchanger 17 is performed. That is, in the primary refrigeration cycle, the refrigerant flows into the primary heat exchanger HE1 of the refrigerant heat exchanger 17, and the primary heat exchanger 13a of the first heat storage tank 12a and the second heat storage tank 12b. , 13b, the two-way valve KV
1: open, KV2: closed, KV3: open, KV4: closed, KV5: closed, KV6: open. Also, the bypass valves BV1, BV2 are closed.

(I) Indoor unit: only cooling mode (when the indoor cooling load of the first secondary refrigeration cycle is large) In this case, primary refrigeration cycle: cooling mode, that is,
Four-way valve 3: cooling mode, outdoor expansion valve 5: predetermined opening,
First and second heat storage tank expansion valves EX1, EX2: set to fully open. In addition, the indoor unit that performs the cooling operation using the first heat storage tank is 6a.
And 6b, an indoor unit that performs cooling operation using the second heat storage tank
6c. Therefore, the three-way valves Va1, Va2, Vb1, Vb2 are set to the first mode, and Vc1, Vc2 are set to the second mode.

At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the outdoor heat exchanger 4 and decompressed by the outdoor expansion valve 5 to be in a liquid or two-phase state. After evaporating in the tube of the side heat exchange unit HE1 and exchanging heat with the refrigerant in the tube of the secondary side heat exchange unit HE2, the process returns to the outdoor unit 1. On the other hand, regarding the secondary refrigeration cycle, the first heat storage tank 12a, the second heat storage tank 12
Since both b are stored cool and the indoor cooling load of the first secondary refrigeration cycle is large, the secondary heat exchange part HE2 of the refrigerant heat exchanger 17 operates in the first secondary refrigeration cycle. The three-way valves V1 and V3 are set to the positive mode and V2 and V4 are set to the negative mode.

In this state, the refrigerant in the first secondary refrigeration cycle
The first refrigerant transfer pump 15a sends the heat to the secondary heat exchanger 14a in the first heat storage tank and the secondary heat exchanger HE2 of the refrigerant heat exchanger, and performs heat exchange (radiation). Becomes a low-temperature refrigerant,
The refrigerant is sent to the indoor heat exchangers 6a and 6b, where it exchanges heat with the indoor air (absorbs heat) to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant and the first heat storage tank 12a and the refrigerant heat exchanger 17
Return to Also, regarding the second secondary side refrigeration cycle,
The refrigerant is pumped by the second refrigerant transfer pump 15b into the second heat storage tank.
The refrigerant is sent to the secondary heat exchanger 14b, exchanges heat (radiates) with the heat storage material 11 that has been stored through the secondary heat exchanger 14b, becomes a low-temperature refrigerant, and is sent to the indoor heat exchanger 6c, where it is indoors. The refrigerant exchanges heat with the air (radiates heat) to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant and returns to the second heat storage tank 12b. Thus, even when the indoor load of the first secondary refrigeration cycle is large, the cooling operation corresponding to the load can be performed.

(II) Indoor unit: heating mode only (when the indoor heating load of the first secondary refrigeration cycle is large) In this case, primary refrigeration cycle: heating mode, four-way valve: heating mode, outdoor expansion valve: Predetermined opening degree, 1st, 2nd
Thermal storage tank expansion valves EX1, EX2: Fully open. The indoor units that perform the heating operation using the first heat storage tank are 6a and 6b, and the indoor units that perform the heating operation using the second heat storage tank are 6c. Therefore, the three-way valves Va1, Va2, Vb1, Vb2: first mode, Vc1, Vc2: second mode
Mode.

At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the pipe of the primary heat exchange section HE1 of the refrigerant heat exchanger 17 and exchanges heat with the refrigerant in the pipe of the secondary heat exchange section HE2. Then, the pressure is reduced by the outdoor expansion valve 5 to be in a liquid or two-phase state, evaporated in the outdoor heat exchanger 4, and returned to the compressor 2.

On the other hand, for the secondary refrigeration cycle, the first heat storage tank 12
a, the second heat storage tank 12b stores heat, and the indoor heat load of the first secondary refrigeration cycle is large.
The seventeenth secondary heat exchange section HE2 is set to the three-way valves V1, V3: positive mode and V2, V4: negative mode so as to operate in the first secondary refrigeration cycle. In this state, the refrigerant in the first secondary refrigeration cycle is supplied to the first heat storage tank 1 by the first refrigerant transfer pump 15a.
2a of the secondary heat exchanger 14a and the refrigerant heat exchanger 17
The heat is sent to the next-side heat exchange section HE2, and heat exchange (heat absorption) is performed in each of them to become a high-temperature refrigerant. Upon heating, the refrigerant itself becomes a low-temperature refrigerant and becomes the first heat storage tank 12a,
Then, the process returns to the refrigerant heat exchanger 17. In the second secondary refrigeration cycle, the refrigerant is sent to the secondary heat exchanger 14b in the second heat storage tank 12b by the second refrigerant transport pump 15b.
Heat exchange (heat absorption) with the heat storage material 11 stored through the secondary heat exchanger 14b to become a high-temperature refrigerant, which is sent to the indoor heat exchanger 6c, where it exchanges heat with the indoor air (radiates heat) to perform indoor air And the refrigerant itself becomes a low-temperature refrigerant and the second heat storage tank
Return to 12b. Thus, even when the indoor load of the first secondary refrigeration cycle is large, the heating operation corresponding to the load can be performed.

(III) Hybrid cooling and heating mode III-1) A case where the indoor load coexists with cooling and heating and the daytime cooling load is so large that cooling by the heat storage tank cannot cover the load. In this case, the secondary-side refrigeration cycle performs cooling and heating operations that are good for the cold storage heat of the two heat storage tanks. For cooling with a large load, the refrigerant refrigeration does not pass through the heat storage tank in the primary-side refrigeration cycle. This is addressed by performing a cooling operation via an exchanger.

In the case of the first heat storage tank 12a: cold storage and the second heat storage tank 12b: heat storage, that is, the first secondary refrigeration cycle: cooling operation (the indoor unit 6a and
6b), second secondary refrigeration cycle (indoor unit 6c): heating operation, indoor cooling load of first secondary refrigeration cycle is large, and cooling operation is performed using first heat storage tank 12a. The indoor units to be performed are 6a and 6b, and the indoor unit that performs the heating operation using the second heat storage tank 12b is 6c. Therefore, the three-way valves Va1, Va2, Vb1,
Vb2: First mode, Vc1, Vc2: Second mode.

In this case, the primary refrigeration cycle: cooling mode, that is,
Four-way valve 3: cooling mode, outdoor expansion valve 5: predetermined opening,
First and second heat storage tank expansion valves EX1, EX2; set to fully open. Three-way valves V1, V3: positive mode, V2, V so that the secondary heat exchange part HE2 of the refrigerant heat exchanger 17 operates in the first secondary refrigeration cycle.
4: Set to negative mode.

At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the outdoor heat exchanger 4 and decompressed by the outdoor expansion valve 5 to be in a liquid or two-phase state. After evaporating in the tube of the side heat exchange unit HE1 and exchanging heat with the refrigerant in the tube of the secondary side heat exchange unit HE2, the process returns to the outdoor unit 1.

On the other hand, for the secondary refrigeration cycle, the first heat storage tank 12
a: cold storage, second heat storage tank 12b: heat storage,
The refrigerant in the secondary refrigeration cycle is the first refrigerant transport pump
At 15a, the heat is sent to the secondary heat exchanger 14a in the first heat storage tank 12a and to the secondary heat exchange part HE2 of the refrigerant heat exchanger 17, where each of them exchanges heat (dissipates heat) to produce a low-temperature refrigerant. And is sent to the indoor heat exchangers 6a and 6b, where it exchanges heat with indoor air (heat absorption).
While cooling the indoor air, the refrigerant itself becomes a high-temperature refrigerant and returns to the first heat storage tank 12a and the refrigerant heat exchanger 17.
On the other hand, the refrigerant in the second secondary refrigeration cycle is supplied to the second refrigerant transfer pump 15b by a secondary heat exchanger in the second heat storage tank 12b.
14b, and exchanges heat (absorbs heat) with the heat storage material 11 that has been stored through the secondary heat exchanger 14b to become a high-temperature refrigerant, which is sent to the indoor heat exchanger 6c, where it exchanges heat with indoor air ( While radiating heat to heat the indoor air, the refrigerant itself becomes a low-temperature refrigerant and returns to the second heat storage tank 12b. Thus, the first 2
Even when the indoor cooling load of the secondary refrigeration cycle is large, the cooling operation corresponding to the load can be performed, and at the same time, the heating operation is performed in the second secondary refrigeration cycle.

III-2) The case where the indoor load coexists with cooling and heating, and the daytime heating load is large and cannot be covered by the heat storage by the heat storage tank will be described. In this case, the secondary refrigeration cycle performs cooling and heating operations by the cold storage heat of the two heat storage tanks during the night operation, and for heating with a large load in the daytime, the primary refrigeration cycle passes through the heat storage tanks. Instead, a heating operation is performed via a refrigerant heat exchanger to cope with the problem.

For example, in the case of the first heat storage tank 12a: cold storage and the second heat storage tank 12b: heat storage, ie, the first secondary refrigeration cycle (the indoor unit 6)
a): Cooling operation, second secondary refrigeration cycle (indoor unit 6b
And 6c): The indoor unit that performs the cooling operation using the first heat storage tank 12a uses the indoor unit 6a and the second heat storage tank 12b in the heating operation and the indoor heating load of the second secondary refrigeration cycle is large. The indoor units that perform the heating operation by heating are 6b and 6c. Therefore, the three-way valves Va1, Va2 are set to the first mode, and the Vb1, Vb2, Vc1, Vc2 are set to the second mode.

In this case, the primary refrigeration cycle: heating mode, that is,
Four-way valve 3: heating mode, outdoor expansion valve 5: predetermined opening,
Expansion valves EX1 and EX2 for first and second heat storage tanks: fully open, refrigerant heat exchanger
The primary heat exchanger 13 of the first heat storage tank 12a and the second heat storage tank 12b is set so that the refrigerant flows into the primary heat exchange section HE1 of the first heat storage tank 12a.
Two-way valve KV1: open, KV2: a, 13b to prevent refrigerant from flowing
Set to closed, KV3: open, KV4: closed, KV5: closed, KV6: open. Also, the three-way valves V1, V3: negative mode, V3 so that the secondary heat exchange section HE2 of the refrigerant heat exchanger 17 operates in the second secondary refrigeration cycle.
2, V4: Set to normal mode.

At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the pipe of the primary heat exchange part HE1 in the refrigerant heat exchanger 17 and exchanges heat with the refrigerant in the pipe of the secondary heat exchange part HE2. Then, the pressure is reduced by the outdoor expansion valve 5 to be in a liquid or two-phase state, evaporated in the outdoor heat exchanger 4, and then returned to the compressor 2.

In this state, the refrigerant in the first secondary refrigeration cycle
In the first refrigerant transport pump 15a, heat exchange (radiation) occurs with the heat storage material 11 that has been stored through the secondary side heat exchanger 14a in the first heat storage tank 12a to become a low-temperature refrigerant, which is sent to the indoor unit 6a. There, heat exchange (heat absorption) with the indoor air is performed to cool the indoor air, and the refrigerant itself becomes a high-temperature refrigerant and returns to the first heat storage tank 12a.

On the other hand, the refrigerant in the second secondary refrigeration cycle is supplied to the secondary heat exchanger 14b in the second heat storage tank 12b and the secondary side of the refrigerant heat exchanger 17 by the second refrigerant transfer pump 15b. The heat is sent to the heat exchange HE2, and heat exchange (heat absorption) is performed by each to become a high-temperature refrigerant. The refrigerant is sent to the indoor units 6b and 6c, where it exchanges heat with the room air (radiates heat) to heat the room air, and the refrigerant itself. Becomes a low-temperature refrigerant and returns to the second heat storage tank 12b and the refrigerant heat exchanger 17. In this manner, even when the indoor heating load of the second secondary refrigeration cycle is large, the heating operation corresponding to the load can be performed, and
At the same time, a cooling operation is performed in the first secondary refrigeration cycle.

In the case of the first heat storage tank: heat storage and the second heat storage tank: cool storage, heating operation is performed in the first secondary refrigeration cycle and cooling operation is performed in the second secondary refrigeration cycle. The operation and cooling operation are the same as described above.

As described above, the primary heat of the refrigerant heat exchanger including the compressor, the four-way valve, the outdoor heat exchanger, the outdoor expansion valve, the switching valve, and the primary heat exchanger and the secondary heat exchanger. A first heat storage tank expansion valve, a switching valve, and a first heat exchanger and a secondary heat exchanger filled with a heat storage material.
In the primary heat exchanger in the thermal storage tank, and in the second thermal storage tank composed of the primary heat exchanger and the secondary heat exchanger filled with the thermal storage material, the expansion valve for the second thermal storage tank, the switching valve, and the thermal storage material And a primary side heat exchanger is connected in parallel to form a primary side refrigeration cycle, between the four-way valve and the outdoor heat exchanger, between the four-way valve and the first heat storage tank, and the four-way valve. And a bypass circuit via a bypass valve in parallel between each of the four-way valve and the second heat storage tank, and a secondary heat exchanger in the first heat storage tank. A first refrigerant transfer pump, a first secondary refrigeration cycle including a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary heat exchanger in the second heat storage tank, a second refrigerant transfer pump, Forming a secondary refrigeration cycle in parallel with a second secondary refrigeration cycle comprising a switching valve provided at the entrance and exit of the indoor heat exchanger; The secondary heat exchange section of the refrigerant heat exchanger communicates with the first secondary refrigeration cycle or the second secondary refrigeration cycle via the switching valve, and controls as described above. This allows not only simultaneous operation of heating and cooling in the daytime with cold storage heat using nighttime power,
It becomes possible to cope with a load that cannot be covered by cold storage heat at night.

Effect of the Invention As described above, the present invention sequentially communicates a compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, and a refrigerant heat exchanger, and further includes a first heat storage tank expansion valve and a first heat storage A first-side refrigeration cycle is formed by connecting the second heat storage tank and the expansion valve for the second heat storage tank in parallel with each other, and the refrigerant heat exchanger includes a primary heat exchange unit and a secondary heat exchange unit. The primary heat exchange unit is in communication with the primary refrigeration cycle via a switching valve, and the first heat storage tank is composed of a primary heat exchanger and a secondary heat exchanger, And the heat storage material is filled in the first heat storage tank,
The primary heat exchange section is in communication with the primary refrigeration cycle via a switching valve, and the second heat storage tank is composed of a primary heat exchanger and a secondary heat exchanger. 2 Heat storage material is filled in the heat storage tank,
The primary-side heat exchange unit is in communication with the primary-side refrigeration cycle via a switching valve, between the four-way valve and the outdoor heat exchanger, between the four-way valve and the first heat storage tank, and A bypass circuit is provided in parallel between the valve and the outdoor heat exchanger and between the four-way valve and the second heat storage tank via a bypass valve, respectively, while a secondary heat exchanger in the first heat storage tank is provided. , A first refrigerant transfer pump, a first secondary refrigeration cycle including a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary heat exchanger and a second refrigerant transfer pump in the second heat storage tank. And a second secondary refrigeration cycle comprising a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary refrigeration cycle provided in parallel with the secondary heat cycle of the refrigerant heat exchanger. The exchange unit communicates with the first secondary refrigeration cycle or the second secondary refrigeration cycle via the switching valve. By, it is possible to realize the simultaneous operation of heating and cooling by the heat storage using the nighttime power,
It becomes possible to provide an air conditioner with a low operating cost.

[Brief description of the drawings]

FIG. 1 is a refrigeration system diagram of a heat pump air conditioner according to an embodiment of the present invention, and FIG. 2 is a refrigeration system diagram of a heat pump air conditioner showing a conventional example. 1 ... outdoor unit, 2 ... compressor, 3 ... 4-way valve, 4 ... outdoor heat exchanger, 5 ... outdoor expansion valve, 8a-8c ... indoor heat exchanger, 11 ... heat storage Material, 12a ... First thermal storage tank, 12b ...
2nd heat storage tank, 13a, 13b ... primary heat exchanger of heat storage tank, 14
a, 14b: Secondary heat exchanger of heat storage tank, 15a, 15b: Refrigerant transfer pump, 17: Refrigerant heat exchanger, EX1, EX2: Expansion valve for heat storage tank, KV1-KV6: Two-way Valve, V1 to V4 ... three-way valve, Va1,
Va2, Vb1, Vb2, Vc1, Vc2 ... three-way valve, BV1, BV2 ... bypass valve, HE1 ... primary heat exchange part of refrigerant heat exchanger, HE2 ... secondary heat exchange of refrigerant heat exchanger Department.

Claims (1)

(57) [Claims] The compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, and a refrigerant heat exchanger are sequentially communicated, and further an expansion valve for a first heat storage tank, a first heat storage tank, and a second heat storage. Tank expansion valve and second
The heat storage tanks are connected in parallel to form a primary refrigeration cycle, wherein the refrigerant heat exchanger includes a primary heat exchange section and a secondary heat exchange section, and the primary heat exchange section has a switching valve. The first heat storage tank is composed of a primary heat exchanger and a secondary heat exchanger, and the first heat storage tank is filled with a heat storage material. And 1
The secondary heat exchange section communicates with the primary refrigeration cycle via a switching valve, the second heat storage tank includes a primary heat exchanger and a second heat exchanger, and The heat storage tank is filled with a heat storage material,
The secondary heat exchange section is in communication with the primary refrigeration cycle via a switching valve, between the four-way valve and the outdoor heat exchanger, between the four-way valve and the first heat storage tank, and a four-way valve. And a bypass circuit via a bypass valve in parallel between each of the four-way valve and the second heat storage tank, and a secondary heat exchanger in the first heat storage tank. , A first refrigerant transfer pump, a first secondary refrigeration cycle including a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary heat exchanger and a second refrigerant transfer pump in the second heat storage tank. And a second secondary refrigeration cycle comprising a switching valve provided at the entrance and exit of the indoor heat exchanger, and a secondary refrigeration cycle provided in parallel with the secondary heat cycle of the refrigerant heat exchanger. The exchange unit is connected to the first secondary refrigeration cycle or the second secondary refrigeration cycle via the switching valve.
A multi-room air conditioner that communicates with the downstream refrigeration cycle.