JPH0439547A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent any bad influence against a life of an air conditioner or environments of the earth, assure an effect of energy saving and enable a stable thermal radiation by a method wherein heat got under an operation of a freezing cycle is accumulated in a thermal medium in a thermal accumulation tank, a capability of a variable capability compressor is varied in such a way as a temperature of the thermal medium in the thermal accumulation tank becomes a predetermined value and then a thermal medium of an amount corresponding to a load of air conditioning is flowed to each of indoor devices. CONSTITUTION:When a cooling mode is set, operations of a compressor 41 and a fan 53 are set at a time range of night time, a cooling and thermal accumulating operation is, carried out, thereby a cooling heat is accumulated in a thermal accumulating tank 54. When a heating mode is set, an operation of the compressor 41, a changing-over of a four-way valve 42 and an operation of a fan 53 are set within a time range of night. A heating and heat accumulating operation is carried out to store the heating heat in the heat accumulation tank 54. When each of the heat accumulations is performed, an operating frequency F of the compressor 41 is controlled in response to a temperature difference between the detected temperature of a thermal medium temperature sensor 55 and the set temperature and a function of a detected temperature of a heat exchanger temperature sensor 51 or a refrigerant temperature sensor 52. At a time range of daytime (other than the night time range), a flow rate adjusting valve 59 of the indoor device producing an operating signal is set to be released and then a heat transporting cooling or heating operation is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) This invention relates to a multi-type air conditioner having a plurality of indoor units.

(Prior Art) In recent years, multi-type air conditioners having a plurality of indoor units are often used in small and medium-sized buildings. - An example is shown in FIG.

In FIG. 6, 1 is a compressor, and the compressor 1 includes a four-way valve 2, an outdoor heat exchanger 3, a receiver 4, and a packed valve 5.
, liquid side piping 6, flow divider 7, multiple electric expansion valves 8, multiple indoor heat exchangers 9, gas side piping 10, packed valve 1
1. The four-way valve 2 and the accumulator 12 are connected in sequence to constitute a heat pump type refrigeration cycle.

That is, during cooling operation, the refrigerant flows in the direction of the solid arrow shown in the figure to form a cooling cycle, and the outdoor heat exchanger 3 is converted into a condenser,
Each indoor heat exchanger 9 works as an evaporator. During heating operation, each indoor heat exchanger 9 is operated as a condenser and the outdoor heat exchanger 3 is operated as an evaporator by switching the four-way valve 2.

An outdoor fan 13 is provided near the outdoor heat exchanger 3, and an indoor fan 14 is provided near each indoor heat exchanger 9.

Furthermore, the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the receiver 4, the packed valve 5, the packed valve 11, the accumulator 12, and the outdoor fan 13 constitute an outdoor unit A. Furthermore, the electric expansion valve 8, the indoor heat exchanger 9, and the indoor fan 14 constitute indoor units B1, B2+B3, respectively.

By the way, when such an air conditioner is actually installed in a building, the overall length of piping tends to become long, and accordingly, a large amount of refrigerant (for example, R-22) is required.

However, there is a problem in that the use of a large amount of refrigerant has an adverse effect on the lifespan of refrigeration cycle equipment and the global environment.

Further, as a multi-type air conditioner, there is one that performs air conditioning by storing heat obtained by operating a refrigeration cycle in a heat medium in a heat storage tank and circulating the heat medium to a plurality of indoor units.

- An example is shown in FIG.

In FIG. 7, 21 is a compressor, and the compressor 21 has
The four-way valve 22, the heat source side heat exchanger 23, the expansion valve 24, and the usage side heat exchanger 25 are connected in sequence to constitute a heat pump type refrigeration cycle.

A heat storage tank 26 stores a heat medium other than a refrigerant (for example, water). This heat storage tank 26 has on-off valves 27, 27,
A circulation pump 28, the utilization side heat exchanger 25, a plurality of on-off valves 29, and a plurality of indoor heat exchangers 30 are sequentially connected to the bridge circuit. Further, a bypass valve 31 is connected in parallel to each on-off valve 29 and each indoor heat exchanger 30.

That is, the compressor 21 and the circulation pump 28 are operated,
Furthermore, by opening each on-off valve 27 and bypass valve 31, the heat obtained in the refrigeration cycle is transferred to the user-side heat exchanger 25.
is stored in the heat medium of the heat storage tank 26 (heat storage operation)
. In addition, the circulation pump 28 is operated, and each on-off valve 27
．． By opening 29, the heat medium in the heat storage tank 26 flows to each indoor heat exchanger 30, and the heat stored in the heat storage tank 26 is released indoors (heat transfer operation).

In the case of this air conditioner, there is no need to lead each refrigerant pipe into the room, so there is an advantage that the amount of refrigerant used can be reduced.

(Problem to be Solved by the Invention) However, in the above air conditioner, when performing heat storage operation, both the compressor 21 and the circulation pump 28 must be operated, which has the disadvantage that power consumption is large. .

Furthermore, since the heat medium circulates through the bypass valve 31 during heat storage operation, there is a drawback that heat loss is large.

In addition, the heat obtained by the refrigeration cycle changes depending on the outside air temperature, and the air conditioning load changes depending on the number of operating indoor units, so the temperature of the heat medium in the heat storage tank 26 is not stable and remains unchanged. This appears as variations in the amount of heat dissipated from the indoor units.

This invention was developed in consideration of the above circumstances, and its purpose is to prevent the lifespan of refrigeration cycle equipment and adverse effects on the global environment, and to reduce power consumption and heat loss without requiring a large amount of refrigerant. An object of the present invention is to provide an air conditioner that enables stable heat dissipation corresponding to the individual air conditioning loads of each indoor unit, while ensuring an energy saving effect.

[Structure of the invention] (Means for solving problems) The air conditioner of this invention is a variable capacity compressor.

A refrigeration cycle in which a heat source side heat exchanger, a pressure reducer, and a usage side heat exchanger are connected, a heat storage tank that stores the heat of the usage side heat exchanger in a heat medium, and a means for detecting the temperature of the heat medium in this heat storage tank. a means for controlling the capacity of the variable capacity compressor according to the detected temperature; a plurality of indoor units connected in parallel to the heat storage tank via a circulation pump; and a means for controlling the amount of heat medium flowing to these indoor units. A plurality of flow rate adjustment valves to be adjusted, means for controlling the opening degrees of these flow rate adjustment valves according to the air conditioning loads of the corresponding indoor units, and a means for controlling the capacity of the circulation pump according to the sum of the air conditioning loads of the indoor units. and means for controlling.

(Function) Heat obtained by operating the refrigeration cycle is transmitted to each indoor unit via the heat medium of the heat storage tank. At this time, the capacity of the variable capacity compressor is changed so that the temperature of the heat medium in the heat storage tank becomes a predetermined value. At the same time, an amount of heat medium corresponding to the air conditioning load of each indoor unit flows to each indoor unit.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, 41 is a variable capacity compressor, and this compressor 41 includes a four-way valve 42, a heat source side heat exchanger 43, a pressure reducer such as an expansion valve 44, a packed valve 45, a liquid side pipe 46, and a heat source side heat exchanger. 47, gas side piping 48, packed valve 4
9, the four-way valve 42 and the accumulator 50 are connected in sequence to constitute a heat pump type refrigeration cycle.

That is, during cooling operation, the refrigerant flows in the direction of the solid arrow shown in the figure to form a cooling cycle, and the heat source side heat exchanger 43 functions as a condenser and the user side heat exchanger 47 functions as an evaporator. During heating operation, the user side heat exchanger 4 is switched by switching the four-way valve 42.
7 works as a condenser, and the heat source side heat exchanger 43 works as an evaporator.

A heat exchanger temperature sensor 51 is attached to the heat source side heat exchanger 43.
and a refrigerant temperature sensor 52 to the pipe between the expansion valve 44 and the packed valve 45.

A fan 53 is provided near the heat source side heat exchanger 43.

A heat storage tank 54 stores a heat medium (such as water) other than a refrigerant. Further, inside this heat storage tank 54, the above-mentioned utilization side heat exchanger 47, heat medium temperature sensor 55, and electric heater 56 as an auxiliary heat source are provided, and this electric heater 56 is connected to a commercial AC power source 57.

A plurality of indoor units B1+"2r...Bn are connected in parallel to this heat storage tank 54 via a circulation pump 58.

Indoor unit B1. B2. ...Bn is the flow rate adjustment valve 5
9 and an indoor heat exchanger 60, an indoor fan 62, and an indoor controller 63. An indoor temperature sensor 64 is connected to this indoor controller 63.

The flow rate adjustment valve 59 is for adjusting the amount of heat medium flowing into the indoor unit.

In addition, indoor unit B1. B2. ...An on-off valve 61 is connected in parallel to Bn.

In addition, the compressor 41, the four-way valve 42, the heat source side heat exchanger 43,
Expansion valve 44, packed valve 45, packed valve 49
, an accumulator 50, a heat exchanger temperature sensor 51, a refrigerant temperature sensor 52, and a fan 53 constitute a heat source unit A.

Flow rate adjustment valve 59, indoor heat exchanger 60, indoor fan 62,
and the indoor controller 63, the indoor unit Bl
, B2 + . . . constitute Bn, respectively.

The control circuit is shown in FIG.

A system controller 70 performs overall control of the air conditioner, and is composed of a microcomputer and its peripheral circuits.

This system controller 70 includes the indoor controllers 63, the four-way valve 42, the on-off valve 61, and the fan motor 53.
M1 heat exchanger temperature sensor 51, refrigerant temperature sensor 52, heat medium temperature sensor 55, circulation pump 58, and inverter circuit 71 are connected.

This inverter circuit 71 rectifies the voltage of the commercial AC power supply 72, converts it into AC with a frequency (and voltage) according to the command from the system controller 70, and supplies it as driving power to the compressor motor 41M. .

Each indoor controller 63 is connected to a flow rate adjustment valve 59, a fan motor 62M1 indoor temperature sensor 64, and a remote control type operating device (hereinafter referred to as a remote control) 65.

Each indoor controller 63 is equipped with the following functional means.

(1) Means for sending an operation signal to the system controller 70 when an operation switch (not shown) of the remote controller 65 is turned on.

(2) Find the difference between the indoor temperature Ts set by the remote controller 65 and the temperature Ta detected by the indoor temperature sensor 64, that is, the air conditioning load (cooling load Lc or heating load LH), and send a signal representing the air conditioning load to the system controller along with the above operation signal. 70
means of sending to.

(3) During the heat transfer cooling operation and the heat transfer heating operation, which will be described later, the opening degree of the flow rate adjustment valve 59 of the indoor units B11, B21, ..., Bn is determined based on the air conditioning load (cooling load Lc or heating load LH) of the corresponding indoor unit. ) means to control according to the function of.

The system controller 70 also includes the following functional means.

(1) When the cooling mode is set with the mode selector switch (not shown), the operation of the compressor 41 and the fan 53 are set during the night time period (for example, between 9:00 p.m. and 6:00 p.m.). The refrigerant discharged from the machine 41 is transferred to the four-way valve 42, the heat source side heat exchanger 43, the expansion valve 44, and the liquid side piping 46.
, usage side heat exchanger 47, gas side piping 48, four-way valve 42,
A means for setting a cooling cycle (solid line in the figure) by flowing the liquid in the liquid tank 50 in order and executing a cooling heat storage operation.

(2) Means for determining the set temperature Tcs for the heat medium in the heat storage tank 54 during cooling heat storage operation.

(3) During cooling heat storage operation, find the difference (-Tw-Tcs) between the temperature Tw detected by the heat medium temperature sensor 55 and the set temperature Tcs, and calculate this temperature difference and the temperature T1 (condensation) detected by the heat exchanger temperature sensor 51. Means for determining the operating frequency F of the compressor 41 (output frequency of the inverter circuit 71) from a function of temperature). In this case, the reason why the condensing temperature is incorporated into the determination of the operating frequency F is to suppress an abnormal increase in the pressure on the high pressure side of the refrigeration cycle, and when the condensing temperature is high, the determined value of the operating frequency F decreases.

(4) When the heating mode is set with the mode selector switch, the compressor 41 is operated during the night time, the four-way valve 42
and set the operation of the fan 53, thereby directing the refrigerant discharged from the compressor 41 to the four-way valve 42, the gas side pipe 48,
Usage side heat exchanger 47, liquid side heat exchanger 46, expansion valve 44,
Heat source side heat exchanger 43, four-way valve 42, liquid tank 50
means to set the heating cycle (broken line in the figure) and execute the heating heat storage operation.

(5) Means for determining the set temperature THs (>Tc5) for the heat medium in the heat storage tank 54 during heating heat storage operation.

(6) During heating heat storage operation, the difference between the set temperature THs and the detected temperature Tw of the heat medium temperature sensor 55 (-T Hs -T w
) and determines the operating frequency F of the compressor 41 (output frequency of the inverter circuit 71) from this temperature difference and a function of the detected temperature T2 (condensing temperature) of the refrigerant temperature sensor 52. In this case, the reason why the condensing temperature is incorporated into the determination of the operating frequency F is to suppress an abnormal increase in the pressure on the high pressure side of the refrigeration cycle, and when the condensing temperature is high, the determined value of the operating frequency F decreases.

(7) Means for controlling the output frequency of the inverter circuit 71 based on the determined operating frequency F during the cooling heat storage operation and the heating heat storage operation.

(8) During cooling heat storage operation and heating heat storage operation, when the remaining time until the end of the night time period is a certain amount or more, for example, 1 hour or more, the allowable maximum operating frequency Fmax of the compressor 41 (the allowable output frequency of the inverter circuit 71 A means of executing energy-saving operation by suppressing the maximum value) by a predetermined value.

(9) During daytime hours (other than nighttime hours) and when cooling mode is set, each indoor controller 63
When an operation signal is received from at least one of them, the compressor 41 is operated, the fan 53 is operated, the circulation pump 58 is operated, and the indoor fan 62 of the indoor unit that is issuing the operation signal is operated.
operation, and the opening of the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal, thereby controlling the refrigerant discharged from the compressor 4'i to the four-way valve 42, the heat source side heat exchanger 43, the expansion valve 44,
Liquid side piping 46, utilization side heat exchanger 47, gas side piping 48,
The liquid flows through the four-way valve 42 and the liquid tank 50 in this order to form a cooling cycle, and the heat medium in the heat storage tank 54 is passed from the circulation pump 58 to the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal and to the indoor heat exchanger 60. A means of carrying out sinking and heat transfer cooling operations.

(10) Means for determining the set temperature Tcs for the heat medium in the heat storage tank 54 during heat transfer cooling operation.

(11) During heat transfer cooling operation, the difference between the detected temperature Tw of the heat medium temperature sensor 55 and the set temperature Tcs (-Tw-THs)
means for determining the operating frequency F of the compressor 41 (output frequency of the inverter circuit 71) from this temperature difference and a function of the total cooling load Lcn.

(12) Means for controlling the output frequency of the inverter circuit 71 based on the determined operating frequency F during heat transfer cooling operation.

(13) During heat transfer cooling operation, indoor unit B1゜B2+
. . . A means for controlling the capacity (rotation speed) of the circulation pump 58 according to the sum of the cooling loads Lc of each of the Bn and en.

(14) During daytime hours and when the heating mode is set, when an operation signal is received from at least one of the indoor controllers 63, the compressor 41 is operated, the four-way valve 42 is switched, and the fan 53 is switched on. operation, the operation of the circulation pump 58, and the indoor fan 6 of the indoor unit that outputs the operation signal.
2 operation, the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal is set to open, thereby directing the refrigerant discharged from the compressor 41 to the four-way valve 42, the gas side piping 48, and the user side heat exchanger 4.
7, liquid side piping 46, expansion valve 44, heat source side heat exchanger 43,
The liquid flows through the four-way valve 42 and the liquid tank 50 in this order to form a heating cycle, and the heat medium in the heat storage tank 54 is passed through the circulation pump 58, the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal, and the indoor heat exchanger 60. Means of carrying out sinking, heat transfer heating operations.

(15) Means for determining the set temperature THs for the heat medium in the heat storage tank 54 during the heat transfer heating operation.

(16) During heat transfer heating operation, the difference between the set temperature THs and the detected temperature Tw of the heat medium temperature sensor 55 (-THs-Tw)
The operating frequency F of the compressor 41 (the inverter circuit 7
1 output frequency). In this case, the reason why the condensing temperature is incorporated into the determination of the operating frequency F is to suppress an abnormal increase in the pressure on the high pressure side of the refrigeration cycle, and when the condensing temperature is high, the determined value of the operating frequency F decreases.

(17) Means for controlling the output frequency of the inverter circuit 71 based on the determined operating frequency F during the heat transfer cooling operation and the heat transfer heating operation.

(18) During heat transfer heating operation, indoor units B1°B2.
. . . Means for controlling the capacity (rotation speed) of the circulation pump 58 according to the total sum LHn of the heating loads LH of each of the Bn.

Next, the operation of the above configuration will be explained with reference to FIGS. 3 and 4.

When the cooling mode is set, the operation of the compressor 41 and the operation of the fan 53 are set to execute the cooling heat storage operation during the night time period (for example, between 9:00 PM and 6:00 PM). Thereby, cooling heat is stored in the heat medium of the heat storage tank 54.

During this cooling heat storage operation, the detected temperature of the heat medium temperature sensor 55 (temperature of the heat medium) Tw and the predetermined set temperature Tcs
The operating frequency F of the compressor 41 is controlled according to a function of this temperature difference and the temperature T1 (condensing temperature) detected by the heat exchanger temperature sensor 51.

In this case, the operating frequency F is lowered as the detected temperature Tw approaches the set temperature Tcs, and when the detected temperature Tw reaches the set temperature Tcs (Tw-Tcs), the operation of the compressor 41 is stopped. This stop causes the detected temperature Tw to rise, and when the detected temperature Tw becomes higher than the set temperature Tcs by a certain value α (Tw−Tcs≧α), the operation of the compressor 41 is restarted.

When the heating mode is set, the means sets the operation of the compressor 41, the switching of the four-way valve 42, and the operation of the fan 53 during the night time period, and executes the heating heat storage operation.

Thereby, heating heat is stored in the heat medium of the heat storage tank 54.

During this heating heat storage operation, the preset temperature THs and the temperature detected by the heat medium temperature sensor 55 (temperature of the heat medium) Tw
The operating frequency F of the compressor 41 is controlled according to this temperature difference and a function of the temperature T2 (condensing temperature) detected by the refrigerant temperature sensor 52.

In this case, as the detected temperature Tw approaches the set temperature THs, the operating frequency F is lowered, and when the detected temperature Tw reaches the set temperature T)Is (Tw-THs), the compressor 41
stop operating. Due to this stop, the detected temperature Tw decreases, and when the detected temperature Tw becomes lower than the set temperature THs by a certain value α (THs−Tw≧α), the operation of the compressor 41 is restarted.

In addition, during cooling heat storage operation and heating heat storage operation, if the remaining time until the end of the night time period is more than 1 hour, the compressor 4
The maximum allowable operating frequency FlaX of 1 is suppressed by a predetermined value to execute energy-saving operation.

However, if the remaining time until the end of the nighttime period is less than one hour, the suppression of the maximum allowable operating frequency F laX of the compressor 41 is released, and rapid heat storage is attempted.

During daytime hours (other than nighttime hours), in the cooling mode, when an operation signal is received from at least one of the indoor controllers 63, the compressor 41 is operated, the fan 53 is operated, the circulation pump 58 is operated, The indoor fan 62 of the indoor unit that is issuing the operation signal is set to operate, and the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal is set to be opened, thereby executing the heat transfer cooling operation. That is, the cooling heat obtained by operating the refrigeration cycle is transmitted to the indoor unit via the heat medium of the heat storage tank 54.

During this heat transfer cooling operation, indoor unit) Bl.

B2+ . . . The capacity (rotation speed) of the circulation pump 58 is controlled according to the summation cn of the respective cooling loads Lc of Bn. Furthermore, indoor unit B1 + B2+...
- The opening degree of the Bn flow rate adjustment valve 59 is controlled according to a function of the cooling load Lc of the corresponding indoor unit.

At the same time, the difference (-T w - T Hs) between the detected temperature Tw of the heat medium temperature sensor 55 and the set temperature Tcs is determined, and the operating frequency F of the compressor 41 is determined according to this temperature difference and a function of the total cooling load Len. control.

Therefore, the temperature of the heat medium in the heat storage tank 54 is stabilized regardless of the number of indoor units in operation, and the amount of heat medium corresponding to the cooling load flows through the indoor units.
It is possible to ensure a stable amount of heat radiation corresponding to the individual cooling load in each indoor unit.

During daytime hours and in heating mode, when an operation signal is received from at least one of the indoor controllers 63, the compressor 41 is operated, the four-way valve 42 is switched, and the fan 5 is operated.
3 operation, operation of the circulation pump 58, operation of the indoor fan 62 of the indoor unit that is issuing the operation signal, and opening of the flow rate adjustment valve 59 of the indoor unit that is issuing the operation signal, and executes the heat transfer heating operation. do. That is, heating heat obtained by operating the refrigeration cycle is transmitted to the indoor unit via the heat medium of the heat storage tank 54.

During this heat transfer heating operation, indoor unit B.

B2. ...Total sum LH of each heating load LH of Bn
The capacity (rotation speed) of the circulation pump 58 is controlled according to n. Furthermore, indoor unit B1 * B2 +...
The opening degrees of the Bn flow rate regulating valves 59 are controlled according to a function of the heating load LH of the corresponding indoor unit.

At the same time, the difference (-THs-Tw) between the set temperature Tl(s and the temperature Tw detected by the heat medium temperature sensor 55) is calculated, and this temperature difference, the total heating load T Hn, and the refrigerant temperature sensor 5
The operating frequency F of the compressor 41 is controlled according to a function of the detected temperature T2 (condensing temperature) of No. 2.

Therefore, the temperature of the heat medium in the heat storage tank 54 is stabilized regardless of the number of indoor units in operation, and the amount of heat medium corresponding to the heating load flows through the indoor units.
It is possible to ensure a stable amount of heat radiation corresponding to the individual heating load in each indoor unit.

In particular, the piping length of the refrigeration cycle can be shortened, making it possible to downsize the heat source unit A and significantly reducing the amount of refrigerant used, which can prevent negative effects on the lifespan of refrigeration cycle equipment and the global environment. can.

In addition, in heat storage operation, only the refrigeration cycle is operated and the heat medium is not circulated, so power consumption and heat loss can be kept low, resulting in an energy saving effect.

Furthermore, heat storage has the effect of quickly increasing the cooling capacity and heating capacity.

Further, even if the heat source side heat exchanger 43 freezes and defrosting operation is performed, heating in the indoor unit can be continued.

In addition, as shown in FIG. 5, indoor units B1°B2.
...If a heater (gas combustion type or electric heater type) 80 is provided in the connecting pipe from Bn to the heat storage tank 54, and this heater 80 is operated during the heat transfer heating operation,
Heating capacity can be increased.

[Effect of the invention] As described above, according to the present invention, a variable capacity compressor,
A refrigeration cycle in which a heat source side heat exchanger, a pressure reducer, and a usage side heat exchanger are connected, a heat storage tank that stores the heat of the usage side heat exchanger in a heat medium, and a means for detecting the temperature of the heat medium in this heat storage tank. , a means for controlling the capacity of the variable capacity compressor according to the detected temperature, a plurality of indoor units connected in parallel to the heat storage tank via a circulation pump, and an amount of heat medium flowing into these indoor units. a plurality of flow rate adjustment valves for adjusting the flow rate, means for controlling the opening degrees of these flow rate adjustment valves according to the air conditioning loads of the corresponding indoor units, and a means for controlling the capacity of the circulation pump according to the sum of the air conditioning loads of the indoor units. As the system is equipped with a control means, it does not require a large amount of refrigerant, thereby preventing the life of the refrigeration cycle equipment and adversely affecting the global environment, and also ensuring energy saving effects by keeping power consumption and heat loss to a minimum. , it is possible to provide an air conditioner that enables stable heat radiation corresponding to the individual air conditioning load of each indoor unit.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the main parts of an embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of the control circuit of the same embodiment;
Fig. 3 is a flowchart for explaining the operation of the same embodiment, Fig. 4 is a diagram showing an example of a change in the operating frequency of the variable capacity compressor in the same embodiment, and Fig. 5 is a diagram of a modification of the same embodiment. 6 and 7 are diagrams showing the structure of a conventional air conditioner, respectively. A...Heat source unit, B1. B2. ...Bn...
...Indoor unit, 41...Variable capacity compressor, 43
... Heat source side heat exchanger, 47 ... User side heat exchanger, 5
4... Heat storage tank, 55... Heat medium temperature sensor, 59.
...Flow rate adjustment valve, 60...Indoor heat exchanger, 70...
system controller. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (1)

[Claims] A refrigeration cycle in which a variable capacity compressor, a heat source side heat exchanger, a pressure reducer, and a user side heat exchanger are connected; a heat storage tank that stores the heat of the user side heat exchanger in a heat medium; means for detecting temperature; means for controlling the capacity of the variable capacity compressor according to the detected temperature; a plurality of indoor units connected in parallel to the heat storage tank via a circulation pump; A plurality of flow rate adjustment valves for adjusting the amount of heat medium, a means for controlling the opening degree of these flow rate adjustment valves according to the air conditioning load of the corresponding indoor unit, and a means for controlling the capacity of the circulation pump according to the air conditioning load of each of the indoor units. An air conditioner characterized by comprising means for controlling according to the sum of the following.