JPH07190534A - Heat storage type air conditioning equipment - Google Patents

Abstract

PURPOSE:To enable simultaneous execution of a cold storage operation with an indoor cooling operation corresponding to each indoor requested capacity without causing the problem of gathering of a refrigerant due to a difference in an evaporation temperature and to reduce the quantity of power consumption by suppressing an input at the time of the cooling operation utilizing a cold storage. CONSTITUTION:An operation frequency of a compressor 25 is made prescribed and a gas-side electronic control valve 43 on the indoor heat exchanger 33 side is used for a capacity distribution control according to an indoor requested capacity, while a liquid-side electronic control valve 47 on the same side is used for an overheat control of an indoor heat exchanger 33. The opening of a gas-side electronic control valve 51 on the heat storage heat exchanger 39 side is made prescribed, while a liquid-side electronic control valve 55 on the same side is used for the overheat control of a heat storage heat exchanger 39, and a control time of the the liquid-side electronic control valve 47 and the one of the liquid-side electronic control valve 55 are made asynchronous.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type air conditioner having a heat storage tank in which a heat storage material is stored.

[0002]

2. Description of the Related Art As a heat storage type air conditioner capable of performing cold storage and cooling operation in which the outside air is used as a heat source, the heat storage material stores cold (storage of cold heat) and the room is cooled at the same time, a refrigeration cycle as shown in FIG. There is one having a configuration (for example, see Japanese Patent Laid-Open No. 3-28671).

This refrigeration cycle comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an indoor heat exchanger 4, a heat storage tank 5, electronic control valves 6, 7, 8, 9, 10, 11 and the like. ing. The heat storage tank 5 is filled with water W as a heat storage material, and the heat storage heat exchanger 12 is provided in the water W. Cold water (ice) is stored in the summer using the water W and is used for indoor cooling in the daytime.

FIG. 10 shows a refrigerant circulation path during the cold storage / cooling operation in the heat storage type air conditioner as described above. The refrigerant pressurized and heated in the compressor 1 is condensed in the outdoor heat exchanger 3 and then divided into two, one is decompressed by the electronic control valve 10 and evaporated in the heat storage heat exchanger 12, and the other is The pressure is reduced by the electronic control valve 11 and evaporated in the indoor heat exchanger 4 to become gas. The gasified refrigerant merges and is sucked into the compressor 1. The cold storage in such a cool storage cooling operation is performed by the remaining amount of the indoor cooling performed by the indoor heat exchanger 4.

FIG. 11 shows a control method in the cold storage / cooling operation. According to this, as the cold storage in the water W progresses, the evaporation temperature of the heat storage heat exchanger 12 decreases. Therefore, the pressure corresponding to the decrease in the evaporation temperature is reduced by using the electronic control valve 11, so that the indoor heat exchange is performed. The control is performed such that the evaporation temperature of the cooler 4 is lowered to the same level as the evaporation temperature of the heat storage heat exchanger 12 and the cold storage operation and the cooling operation are performed at the same time.

This is because the water temperature is high at the start of the cold storage / cooling operation and the evaporation temperature of the indoor heat exchanger 4 and the heat storage heat exchanger 12
However, since the evaporation temperature of the cold storage heat exchanger 12 decreases as the cold storage progresses, the electronic control valve 11 is set to a certain value (in order to reduce the pressure of the indoor heat exchanger 4 corresponding to the decrease in the evaporation temperature). (Maximum opening for evaporation temperature)
By lowering the evaporation temperature of the indoor heat exchanger 4, the overall evaporation temperature is lowered, and thereby the cold storage operation and the cooling operation can be performed at the same time.

FIG. 12 shows the operation frequency (Hz) control operation of the compressor 1 in the cold storage operation. According to this, the compressor operating frequency is determined by the remaining cold storage operation time and the current amount of cold storage. Therefore, when the remaining cool storage time is short and the cool storage amount is small, the compressor 1 is operated at a high frequency.

In contrast to the cold storage cooling operation in which the cold storage operation and the cooling operation are performed at the same time as described above, a heat storage type air conditioner capable of performing the cool storage use cooling operation in which the amount of heat stored in the heat storage material is used for indoor cooling is shown in FIG. There is one having a refrigeration cycle configuration as shown in (see, for example, Japanese Patent Laid-Open No. 2-306064).

This refrigeration cycle comprises a compressor 13, an outdoor heat exchanger 14, an indoor heat exchanger 15, a heat storage tank 16, electronic control valves 17, 18, 19, two-way valves 20, 21 and the like. In the heat storage tank 16, as in the case of FIG. 9,
Water W, which is a heat storage material, is filled, and a heat storage heat exchanger 22 is provided in the water W. The water W is used to store cold water (ice) in the summer and use it for indoor cooling in the daytime.

FIG. 14 shows a refrigerant circulation path during the cooling operation using the cold storage in the heat storage type air conditioner as described above. The refrigerant pressurized and heated by the compressor 13 is condensed by the outdoor heat exchanger 14 and is supercooled by the heat storage heat exchanger 22.
The supercooled liquid refrigerant is decompressed by the electronic control valve 19 and evaporated in the indoor heat exchanger 15 to perform indoor cooling,
It is sucked into the compressor 13.

FIG. 15 shows the control operation during the cooling operation using the cold storage. According to this, the refrigerant temperature Tho entering the electronic control valve 19 is detected, and the electronic control valves 17, 1 are controlled so that the refrigerant temperature Tho becomes the same temperature as the target refrigerant temperature Tso.
Control eight. The target refrigerant temperature Tso is calculated and determined by the refrigerant circulation amount of the compressor 13 and the indoor required capacity. By such control, the cool storage utilization rate can be adjusted. For this reason, when the cooling capacity of the indoor demand is large,
It is possible to increase the compressor operating frequency, increase the refrigerant circulation amount, increase the cool storage utilization rate, and obtain a large cooling capacity.

[0012]

However, the following problems occur in the conventional control methods for the cold storage cooling operation and the cold storage utilizing cooling operation. (1) Problems caused by electronically controlled valve control of cold storage / cooling operation When cold storage progresses and the evaporation temperature of the heat storage heat exchanger 12 decreases, the electronic control valve 11 is throttled to lower the evaporation temperature of the indoor heat exchanger 4, so that indoor cooling is performed. Ability becomes large. For this reason, if the cooling capacity required by the room at this time is small, there is a risk of performing unnecessary cooling operation.

Further, the indoor required capacity is low and the heat storage heat exchanger 1
When the evaporation temperature of 2 is low, the electronic control valve 11 is further throttled, so that it becomes difficult for the refrigerant to flow into the indoor heat exchanger 4, and the refrigerant may accumulate in the heat storage heat exchanger 12. (2) Problem caused by control of compressor operating frequency in cold storage / cooling operation When the compressor operating frequency is high, it is possible to store cold in the heat storage tank 5 by the residual refrigerant amount while performing indoor cooling.
When the compressor operating frequency becomes low, there is a possibility that the remaining amount of the refrigerant will be exhausted when the indoor cooling is performed and the cold storage cannot be performed.

Further, when the cold storage progresses and ice adheres to the heat storage heat exchanger 12 and the compressor operating frequency becomes low, the refrigerant circulation amount evaporated in the heat storage heat exchanger 12 and the indoor heat exchanger 4 decreases. . Therefore, even if the electronic control valve 11 is squeezed to reduce the evaporation temperature of the indoor heat exchanger 4, the pressure equivalent to the evaporation temperature of the heat storage heat exchanger 12 is not reached. As a result,
The refrigerant accumulates in the heat storage heat exchanger 12, which causes a problem that indoor cooling cannot be performed. When the refrigerant accumulates in the heat storage heat exchanger 12 and the refrigerant does not flow into the indoor heat exchanger 4, the evaporation temperature of the indoor heat exchanger 4 rises, and accordingly the electronic control valve 11 is narrowed down. Heat exchanger 4
Refrigerant does not flow further. (3) Problems caused by compressor operating frequency control of cooling operation using cold storage In order to produce the ability to comply with indoor demand, if the required capacity is high, the compressor frequency will be increased, and the ratio of the amount of stored cold heat will also increase, Ability is further improved. For this reason, not only the capacity higher than the indoor required capacity is obtained, but also the power consumption is increased and the peak cut effect of the power due to the cold storage by using the night power is reduced.

Therefore, according to the present invention, the cold storage operation and the indoor cooling operation according to the required indoor capacity can be simultaneously performed without causing the problem of refrigerant pooling due to the difference in the evaporation temperature. The purpose is to reduce the power consumption by suppressing the input of.

[0016]

In order to achieve the above object, the present invention relates to a heat storage heat exchange provided in a heat storage tank in a refrigerant circuit provided with a compressor, an outdoor heat exchanger, an indoor heat exchanger and the like. A heat exchanger connected in parallel with the indoor heat exchanger, and a first control valve and a second control valve are respectively provided in the gas-side refrigerant passage and the liquid-side refrigerant passage of the indoor heat exchanger, and the heat storage heat exchanger A third control valve and a fourth control valve are respectively provided in the gas side refrigerant flow path and the liquid side refrigerant flow path, the compressor is set to a constant frequency operation control, and the first control valve is set to a capacity distribution control based on indoor required capacity. And the second control valve is used for superheat control of the indoor heat exchanger, the third control valve is set to a constant opening, and the fourth control valve is used for superheat control of the heat storage heat exchanger. As a configuration in which the control times of the second control valve and the fourth control valve are asynchronous That.

[0017]

According to the heat storage type air conditioner having such a configuration, the cold storage operation and the indoor cooling operation according to the indoor required capacity are performed by the refrigerant accumulation due to the difference in the evaporation temperature between the heat storage heat exchanger and the indoor heat exchanger. It can be done at the same time without the problem of.
Further, during the cooling operation using cold storage, the input during the operation is suppressed and the power consumption is reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a refrigeration cycle in a heat storage type air conditioner showing an embodiment of the present invention. This refrigeration cycle includes a compressor 25, four-way valves 27 and 29 for switching the flow direction of the refrigerant between a solid line state and a broken line state, an outdoor heat exchanger 31 serving as a condenser during cooling and an evaporator during heating, and evaporation during cooling. It is provided with an indoor heat exchanger 33 that serves as a container and a condenser during heating, and a heat storage tank 35.

The heat storage tank 35 is filled with a heat storage material 37 such as water, and a heat storage heat exchanger 39 for exchanging heat with the heat storage material 37 is provided in the heat storage material 37. Heat storage heat exchanger 3
9 and the indoor heat exchanger 33 are connected in parallel.

The gas side refrigerant passage 41 of the indoor heat exchanger 33 is provided with a gas side electronic control valve 43 as a first control valve, and the liquid side refrigerant passage 45 is provided with a liquid side electronic control as a second control valve. Valve 4
7 are provided respectively. On the other hand, the heat storage heat exchanger 39
The gas side refrigerant passage 49 is provided with a gas side electronic control valve 51 as a third control valve, and the liquid side refrigerant passage 53 is provided with a liquid side electronic control valve 55 as a fourth control valve. .
Further, the liquid-side refrigerant flow passage 45 between the indoor heat exchanger 33 and the liquid-side electronic control valve 47 and the liquid-side refrigerant flow passage 53 between the heat storage heat exchanger 39 and the liquid-side electronic control valve 55 are Short-circuit refrigerant flow path 57
A liquid side electronic control valve 59 is provided in the short-circuit refrigerant flow path 57. Further, a two-way valve 63 is provided in the liquid side refrigerant flow path 61 of the outdoor heat exchanger 31, and the compressor 25
A check valve 65 is provided in the flow path between the suction side of the valve and the four-way valve 27.

The gas side refrigerant passage 41 and the liquid side refrigerant passage 45 on both sides of the indoor heat exchanger 33 bypass the indoor heat exchanger 33 and detect the saturation temperature of the refrigerant. Are connected. The liquid-side refrigerant flow passage 45 connected to the indoor heat exchanger 33 is provided with a capillary 69 for reducing the refrigerant noise of the liquid-side electronic control valve 47, and the gas-side refrigerant flow passages 41, 49 and the liquid side. Refrigerant flow paths 45, 5
3, a strainer 71 and a packed valve 73 are provided, and an accumulator 74 is provided on the suction side of the compressor 25.

On the discharge side and the suction side of the compressor 25, temperature sensors 75 and 77 for detecting the discharge gas temperature Td and the suction gas temperature Tsu, respectively, are provided.
7, a temperature sensor 79 for detecting the saturation temperature Tx in the indoor heat exchanger 33 is provided in the gas-side refrigerant flow path 4 of the indoor heat exchanger 33.
1, a temperature sensor 81 for detecting the gas temperature Tx1 of the indoor heat exchanger 33, and an intermediate temperature Tc for the indoor heat exchanger 33.
The temperature sensor 83 for detecting the temperature of the heat storage heat exchanger 39, the temperature sensor 85 and 87 for detecting the liquid temperature TB1 and the gas temperature TB2 in the gas side refrigerant flow passage 49 of the heat storage heat exchanger 39, respectively, the outdoor heat exchange. A temperature sensor 89 for detecting the liquid temperature Te of the outdoor heat exchanger 31 is provided in the liquid-side refrigerant flow path 61 of the device 31.
However, each of the outdoor heat exchangers 31 is provided with a temperature sensor 91 for detecting the outside air temperature To. Further, in the heat storage tank 35, a temperature sensor 9 for detecting the temperature of the heat storage material 37.
3 is provided. Using these, the electronic control valve and the compressor 25 in various operations are controlled, and the cold storage operation, the cold storage cooling operation, the cold storage cooling operation, the normal cooling operation, the heat storage operation, the heat storage heating operation, the heat storage heating operation, the normal heating Drive.

FIG. 2 shows a refrigerant circulation path in the cold storage / cooling operation. This is an operation mode required when cold storage is performed by using nighttime electric power, which enables cooling operation even during nighttime electric power hours, and is particularly effective for tropical nights. The refrigerant discharged from the compressor 25 passes through the four-way valve 27, reaches the outdoor heat exchanger 31, and is condensed into a liquid refrigerant, and then divided into two, one of which is throttled and expanded by the liquid side electronic control valve 55 to store heat. It evaporates in the heat exchanger 39 to become a gas refrigerant, and returns to the compressor 25 through the four-way valve 29. The other is throttled and expanded by the liquid side electronic control valve 47, evaporated in the indoor heat exchanger 33 to become a gas refrigerant, and returns to the compressor 25 through the four-way valve 27. This allows
Cooling and indoor cooling are performed simultaneously.

The control of each electronic control valve at this time is shown in FIGS. 3 and 4. Here, the operating frequency of the compressor 25 is controlled to be constant at a high frequency. First, as shown in FIG. 3, the indoor required capacity is input (step 301), the electronic control valve control is performed according to the required capacity (step 303), and the operation frequency is kept constant until the indoor request is stopped (step 303). Step 305).

FIG. 4 shows the control operation for the electronic control valve. That is, the gas side electronic control valve 51 of the heat storage heat exchanger 39 is kept at a constant opening, and the liquid side electronic control valve 59 provided in the short-circuit refrigerant flow path 57 is fully closed (step 401). The gas side electronic control valve 43 of the indoor heat exchanger 33 is used for capacity distribution control according to the required indoor capacity, and the liquid side electronic control valve 47 is used for superheat control of the indoor heat exchanger 33 (step 40).
3). In this superheat control, the difference Tx1 between the gas temperature Tx1 of the indoor heat exchanger 33 and the saturation temperature Tx of the indoor heat exchanger 33.
-Tx = 5 ° C.

After that, when the predetermined time S (about 30 seconds) has elapsed (step 405), the liquid side electronic control valve 55 of the heat storage heat exchanger 39 is used for controlling the degree of superheat of the heat storage heat exchanger 39 (step 407). That is, the liquid side electronic control valve 47 on the indoor heat exchanger 33 side and the liquid side electronic control valve 55 on the heat storage heat exchanger 39 side have control times asynchronous with each other.
In the superheat control of the heat storage heat exchanger 39, the heat storage heat exchanger 39
Difference between liquid temperature TB1 and gas temperature TB2 on both sides of
Set TB1 = 5 ° C. Then, after the superheat control, the control of the electronic control valve ends when a predetermined time S has elapsed.

At the start of the cold storage / cooling operation, the indoor heat exchanger 3
The evaporation temperature Tei of No. 3 is about 10 ° C., and the heat storage heat exchanger 39
Since the evaporation temperature Tet of is about 7 ° C. lower than the water temperature, the difference between them is represented by ΔTe = | Tei−Tet |. As the cold storage is performed, the water temperature decreases, and the evaporation temperature Tet of the heat storage heat exchanger 39 also decreases. Further, the evaporation temperature T of the indoor heat exchanger 33
ei is almost constant because the indoor temperature does not change much.
Therefore, the evaporation temperature Tet of the heat storage heat exchanger 39 becomes lower than the evaporation temperature Tei of the indoor heat exchanger 33. Therefore, when the refrigerant flow rate decreases, the pressure difference between the inlet and the outlet of the heat exchanger decreases, and the refrigerant easily accumulates in the heat storage heat exchanger 39 having a low temperature. By making the high frequency constant, the refrigerant flows through both heat exchangers 39 and 33 without the refrigerant accumulating in the heat storage heat exchanger 39, a pressure difference between the inlet and the outlet of the heat exchanger is given, and with the cold storage operation, The indoor cooling operation can also be performed.

Further, when the cold storage progresses and the ice making is started, the evaporation temperature Tet of the heat storage heat exchanger 39 decreases to -4 ° C. and ΔTe = 14 ° C., so that the evaporation temperature becomes the indoor heat exchanger 33. The heat storage heat exchanger 39 is significantly different from the heat storage heat exchanger 39, and the refrigerant easily accumulates in the heat storage heat exchanger 39.
The gas side electronic control valve 51 on the 9 side is throttled to a constant opening degree, and the capacity distribution according to the indoor required operating capacity is performed by the gas side electronic control valve 43 on the indoor heat exchanger 33 side, whereby the heat storage heat exchanger 39
The cold storage operation and the indoor cooling operation can be performed at the same time without the refrigerant being accumulated therein.

When controlling the superheat degree of the indoor heat exchanger 33, if the liquid side electronic control valve 47 is throttled, the indoor heat exchanger 3
The evaporation pressure of 3 becomes high, and it becomes difficult for the refrigerant to flow. Therefore, the surplus refrigerant flows into the heat storage heat exchanger 39, and the heat storage heat exchanger 39 has a low evaporation temperature and a low pressure. Therefore, especially when the liquid side electronic control valve 55 is in the opening direction, the refrigerant easily accumulates, The superheat degree control is performed by the liquid side electronic control valve 47 of the indoor heat exchanger 33, and the temperature changed by the control is used,
Since the superheat control of the heat storage heat exchanger 39 is performed, the refrigerant does not accumulate in the heat storage heat exchanger 39 having a low evaporation temperature,
It is possible to control the degree of superheat on both the indoor side and the heat storage tank side.

Next, FIG. 5 shows a refrigerant circulation path when the cooling operation using cold storage is performed in the refrigeration cycle configuration of FIG. The refrigerant compressed / heated by the compressor 25 is a four-way valve 29.
Through the heat storage heat exchanger 39 to become a refrigerant liquid, which is throttled (decompressed) by the electronic control valve 59 to expand, and evaporated at the indoor heat exchanger 33 to become a gas refrigerant, and passes through the four-way valve 27. Return to the compressor 25. As a result, indoor cooling is performed using the cold heat stored in the heat storage tank 5.

The operation frequency control of the compressor 25 at this time is shown in FIG. The compressor 25 has a frequency X1 of the indoor required capacity.
It operates at [Hz] (step 601) and then compares this operating frequency X1 with a preset upper limit value X [Hz] (step 603).
If the operating frequency X1 is lower than the upper limit X, the operating frequency X1 is operated at the operating frequency X1 according to the indoor required capacity as it is (step 605). The operation is continued until the indoor request is stopped (step 609).

The upper limit value X [Hz] of the operating frequency is determined as follows.

FIG. 7 shows the compressor 2 during the cooling operation using the cold storage.
5 shows the relationship between the operating frequency Hz of 5 and the input (shown by a chain line) / capacity (shown by a solid line). The input during driving is
As indicated by the alternate long and short dash line, it increases as the operating frequency increases. Further, the rate of increase of the input also increases as the operating frequency increases. On the other hand, the capacity indicated by the solid line also increases as the operating frequency increases, but the capacity increase rate decreases as the operating frequency increases. Here, the operation frequency at the time when the decrease in the capacity increase rate becomes large is X [Hz]
And

FIG. 8 shows operating frequency Hz and operating efficiency (CO
P) is shown. COP is from low Hz to high H
It gradually decreases as it becomes z. Then, the rate of change of COP from low Hz operation to the above X [Hz] and X [H
Comparing the change rate of COP from z] to high Hz operation, the low Hz operation up to X [Hz] shows less decrease in COP than the high Hz operation exceeding X [Hz].

As described above, by setting the above-mentioned X [Hz] to the above-mentioned upper limit value X of the operating frequency, it is possible to suppress the input as much as possible and to keep the capacity large, and to keep the COP at a high level during the operation. Is possible. As a result, it becomes possible to perform the cooling operation by using the cold heat stored in the cold storage tank 5 by using the nighttime power with less power consumption, and the power leveling / peak cut effect is further exerted. Will be.

The control function shown in the cold storage / cooling operation in FIGS. 2 to 4 is applicable not only to the configuration of the above embodiment but also to superheat control of two or more heat exchangers.

[0038]

As described above, according to the present invention, the cold storage cooling operation for storing cold heat in the heat storage tank and the indoor cold storage operation for simultaneously performing indoor cooling according to the indoor required capacity are performed.
This can be performed without causing the problem of refrigerant pooling due to the difference in evaporation temperature between the heat storage heat exchanger in the heat storage tank and the indoor heat exchanger.

Further, in the cooling operation using cooling storage in which the stored cooling heat is used to perform the cooling operation, the upper limit value of the operating frequency of the compressor is set, and when the indoor required cooling capacity is equal to or higher than the upper limit value, the upper limit value is set. When the indoor required cooling capacity is less than the upper limit value, the compressor frequency of the required capacity is followed, so that the input during operation can be suppressed and the power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle in a heat storage type air conditioner showing an embodiment of the present invention.

FIG. 2 is a refrigerant circulation path diagram when a cold storage / cooling operation is performed in the heat storage type air conditioner having the refrigeration cycle configuration of FIG.

FIG. 3 is a flowchart showing the overall control operation when a cold storage / cooling operation is performed.

FIG. 4 is a flowchart showing a control operation of an electronic control valve when a cold storage / cooling operation is performed.

FIG. 5 is a refrigerant circulation path diagram in the case of performing a cool storage utilizing cooling operation in the heat storage type air conditioner having the refrigeration cycle configuration of FIG. 1.

FIG. 6 is a flowchart showing a control operation of a compressor operating frequency when a cooling operation using cold storage is performed.

FIG. 7 is a correlation diagram of the operating frequency and the input and capacity in the cooling operation using the cold storage.

FIG. 8: Operating frequency and COP in cooling operation using cold storage
It is a correlation diagram with.

[Fig. 9] Fig. 9 is a refrigeration cycle configuration diagram of a heat storage type air conditioner performing a cold storage cooling operation as a conventional example.

FIG. 10 is a refrigerant circulation path diagram in the case of performing a cool storage / cooling operation in the heat storage type air conditioner having the refrigeration cycle configuration of FIG. 9.

FIG. 11 is a flowchart showing a control operation of the electronic control valve when a cool storage / cooling operation is performed in the heat storage type air conditioner of FIG. 9.

FIG. 12 is a flowchart showing a control operation of a compressor operating frequency when a cold storage / cooling operation is performed in the heat storage type air conditioner of FIG. 9.

FIG. 13 is a refrigeration cycle configuration diagram of a heat storage type air conditioner that performs a cooling operation using cooling storage as a conventional example.

FIG. 14 is a refrigerant circulation path diagram in the case of performing a cooling storage utilizing cooling operation in the heat storage type air conditioner having the refrigeration cycle configuration of FIG. 13.

FIG. 15 is a flowchart showing a compressor operating frequency and a control operation of an electronic control valve when a cooling storage utilizing cooling operation is performed in the heat storage type air conditioner of FIG. 13.

[Explanation of symbols]

 25 compressor 31 outdoor heat exchanger 33 indoor heat exchanger 41,49 gas-side refrigerant flow passage 43 gas-side electronic control valve (first control valve) 45,53 liquid-side refrigerant flow passage 47 liquid-side electronic control valve (second) Control valve) 51 Gas side electronic control valve (third control valve) 55 Liquid side electronic control valve (fourth control valve)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000156938 Kansai Electric Power Co., Inc. 3-3-22 Nakanoshima, Kita-ku, Osaka-shi, Osaka (71) Applicant 000211307 Chugoku Electric Power Co., Inc. 4-33 Komachi, Naka-ku, Hiroshima-shi, Hiroshima No. (71) Applicant 000180368 Shikoku Electric Power Co., Inc. Marunouchi No. 2-5, Takamatsu City, Kagawa Prefecture (71) Applicant 000164438 Kyushu Electric Power Co., Inc. 2-82 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture (71) Applicant 000003078 TOSHIBA CORPORATION 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture (72) Inventor Takashi Doi 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Incorporated, Toshiba Living Space Systems Research Institute (72) Inventor Katsuaki Yamagishi Yokohama, Kanagawa 8 Shinsita-cho, Isogo-ku, Yokohama, Ltd. Incorporated company Toshiba Living Space Systems Engineering Laboratory (72) Inventor Hirokazu Yamaguchi Iso, Yokohama, Kanagawa Shin-Sugita-cho, Ward 8 Incorporated company Toshiba Living Space Systems Research Institute (72) Inventor Eiji Kuwabara 336 Tatehara, Fuji City, Shizuoka Prefecture 336 Toshiba Corporation Fuji Factory (72) Yasuji Ogoshi, 336 Tatehara Fuji City, Shizuoka Prefecture 336 Toshiba Corporation Inside the Fuji factory

Claims (3)

[Claims] 1. A heat storage heat exchanger provided in a heat storage tank is connected in parallel with the indoor heat exchanger to a refrigerant circuit equipped with a compressor, an outdoor heat exchanger, an indoor heat exchanger, etc. A first control valve and a second control valve are provided in the gas-side refrigerant passage and the liquid-side refrigerant passage of the exchanger, respectively, and a third control is performed in the gas-side refrigerant passage and the liquid-side refrigerant passage of the heat storage heat exchanger. Valve and a fourth control valve are provided respectively, the compressor is operated for constant frequency operation, the first control valve is used for capacity distribution control according to indoor required capacity, and the second control valve is used for overheating of the indoor heat exchanger. Temperature control, the third control valve is set to a constant opening degree, the fourth control valve is used for superheat degree control of the heat storage heat exchanger, and the control times of the second control valve and the fourth control valve are asynchronous. A heat storage type air conditioner characterized by the above. 2. The first control valve with the third control valve at a constant opening
The control valve performs capacity distribution control according to the required indoor capacity, the second control valve controls the superheat degree of the indoor heat exchanger, and after a lapse of a predetermined time, the fourth control valve controls the superheat degree of the heat storage heat exchanger. The heat storage type air conditioner according to claim 1. 3. An upper limit value is set for a compressor operating frequency during a cooling operation using cold storage using cold heat in a heat storage tank,
If there is an indoor required cooling capacity above this upper limit value, operation is performed at the upper limit value, while if there is an indoor required cooling capacity below the upper limit value, a control function that follows the compressor frequency of the required capacity is provided. Heat storage type air conditioner characterized by.