JP2015114051A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system designed so as to shorten rise time until blowoff of hot air when starting up heating.SOLUTION: The air conditioning system includes: a heat storage part having a compressor, a cooling/heating exchange four-way valve, an indoor heat exchanger, a throttle valve, an outdoor heat exchanger, piping and heat storage material; a control part; a first valve; and a second valve. The heat exchanging part is placed between the compressor and the throttle valve. The first valve is placed between the throttle valve and the outdoor heat exchanger. The second valve is placed between the throttle valve and the heat storage part, and includes: a first circulation pathway making refrigerant circulate among the compressor, the indoor heat exchanger and the outdoor heat exchanger; and a second circulation pathway making refrigerant circulate among the compressor, the indoor heat exchanger and the heat storage part. Open and close of the first valve and the second valve are controlled by the control part to conduct heating operation in a second step for making the refrigerant circulate into the second circulation pathway after a first step for making the refrigerant circulate into the first circulation pathway.

Description

  Embodiments relate to an air conditioning system.

  Attempts have been made to shorten the rise time until hot air is blown into the room when the air conditioning system is heated. For example, in a heat pump having a heat storage tank that stores heat generated in the compressor and a heat exchange device for heat absorption provided in the heat storage tank, one end of the endothermic heat exchanger is connected to the suction port of the compressor. In an air conditioner having a structure in which the refrigerant inflow side at the other end is connected to an on-off valve, the refrigerant remaining in the heat storage tank is heated with a heat storage material, compressed by closing the on-off valve on the refrigerant inflow side at startup. Proposals have been made to shorten the rise time by supplying a high-temperature refrigerant to the machine side. However, in order to shorten the rise time, it is necessary to raise these temperatures so that the heat of the refrigerant does not escape not only to the refrigerant but also to the compressor, the indoor heat exchanger, and the piping that are in contact with the refrigerant. Since a large amount of heat is required to raise the temperature of these devices, the method of heating only the refrigerant remaining in the heat storage tank and circulating the heat has a problem that the amount of heat that can be supplied is insufficient and the effect of shortening the rise time is small. There is.

  In addition, an air conditioner having a heat pump that places a heat storage heat exchanger having a heat storage material in the refrigerant circulation path after discharging the compressor stores heat in the heat storage material during compressor operation, and from the heat storage material to the room during stoppage. Dissipate heat. In this case, since the heat of the heat storage material is directly input to the indoor heat exchanger without going through the compressor, the rise time can be shortened, but the indoor heat exchanger and the heat storage heat exchanger Since the circulation path is connected in series with the flow, the pressure loss increases, and the heating capacity decreases. In addition, since the refrigerant temperature after discharging the compressor is higher than the refrigerant temperature before entering the compressor, the relative temperature difference between the heat storage material and the discharge refrigerant is reduced, limiting the heat absorption and heat dissipation capacity between the discharge refrigerant and the heat storage material. It becomes a problem to be done.

JP 05-187735 A

  The air conditioning system of the embodiment shortens the rise time until hot air blow-out at the time of heating activation.

  The air conditioning system of the embodiment includes a compressor, a cooling / heating switching four-way valve, an indoor heat exchanger, a throttle valve, an outdoor heat exchanger, piping, a heat storage unit having a heat storage material, a control unit, 1 and a second valve, and the pipe forms a circulation circuit for circulating a refrigerant between the compressor, the indoor heat exchanger, and the outdoor heat exchanger, and the compressor performs outdoor heat exchange. The four-way valve is arranged between the compressor and the indoor heat exchanger, the compressor and the outdoor heat exchanger, and the throttle valve is arranged in the circulation circuit between the compressor and the indoor heat exchanger. Arranged between the heat exchanger and the outdoor heat exchanger, the heat storage section is arranged between the compressor and the throttle valve, and the first valve is arranged between the throttle valve and the outdoor heat exchanger. The second valve is disposed between the throttle valve and the heat storage unit, and a refrigerant is provided between the compressor, the indoor heat exchanger, and the outdoor heat exchanger. There is a first circulation path to circulate, a compressor, an indoor heat exchanger, and a second circulation path for circulating the refrigerant between the heat storage unit, and the refrigerant is circulated through the first circulation system path. After the first step, the controller controls the opening and closing of the first valve and the second valve so that the heating operation is performed in the second step of circulating the refrigerant in the second circulation system.

Drawing 1 is a heating cycle lineblock diagram of an air harmony device (system) of an embodiment. FIG. 2 is a conceptual cross-sectional view of the heat storage unit of the embodiment. Drawing 3 is a flow chart of preheating heating operation of the air harmony device system of an embodiment. FIG. 4 is a chart according to the switching signal of the embodiment. Drawing 5 is a heating cycle lineblock diagram of an air harmony device (system) of an embodiment. FIG. 6 is a flowchart of the preheating heating operation of the air conditioner system according to the embodiment. FIG. 7 is a graph showing the rotation frequency of the rotor of the compressor according to the embodiment.

Hereinafter, embodiments will be illustrated with reference to the drawings. Note that a detailed description common to the embodiments is omitted as appropriate.
[First Embodiment]
Drawing 1 is a lineblock diagram of the heating cycle of air harmony system 100 concerning a 1st embodiment. The air conditioning system (air conditioning apparatus) of the embodiment includes a compressor 1 that compresses a refrigerant, a cooling / heating switching four-way valve 2, an indoor heat exchanger 3, a throttle valve 4, an outdoor heat exchanger 5, and a control. It is comprised from the part 6, the heat storage part 7, the 1st valve | bulb, and the 2nd valve | bulb.

  The compressor 1 is arrange | positioned between the outdoor heat exchanger 3 and the indoor heat exchanger 4, and compresses the refrigerant | coolant which is a heat medium. An accumulator that stores liquid refrigerant may be attached to a part of the compressor 1. In this case, the gasified and gasified refrigerant gasified by the accumulator is sent to the compression chamber of the compressor 1. The refrigerant exiting the compressor 1 is sucked into the compressor 1 again by the pipe P through the four-way valve 2, the indoor heat exchanger 3, the throttle valve 4, and the outdoor heat exchanger 5. As the refrigerant, for example, hydrofluorocarbon, hydrochlorofluorocarbon, or the like can be used. The pipe P includes a first circulation path for circulating a refrigerant between the compressor 1, the indoor heat exchanger 3, and the outdoor heat exchanger 5, the compressor 1, the indoor heat exchanger 3, and a heat storage unit. 7 and a second circulation path for circulating the refrigerant.

  The four-way valve 2 is disposed between the compressor 1 and the indoor heat exchanger 3 and between the compressor 1 and the outdoor heat exchanger 5. The four-way valve 2 can switch the circulation direction of the refrigerant compressed by the compressor 1. The circulation circuit in which the compressed refrigerant goes to the indoor heat exchanger 3 is a circuit during heating. In the case of heating, warmed air is blown from the indoor heat exchanger 3 into the room. A circulation circuit in which the compressed refrigerant is directed to the outdoor heat exchanger 5 is a circuit during cooling. In the case of the refrigerant, the cooled air is blown from the indoor heat exchanger 3 into the room. The preheating heating operation is the same as the heating operation except that the blowing of warm air from the indoor heat exchanger 3 into the room is restricted. Hereinafter, although an embodiment explains heating and omits about cooling, an air harmony device can be provided with both functions of cooling and heating. The air-conditioning apparatus 100 (system) having a function only for heating can omit the four-way valve.

The indoor heat exchanger 3 exchanges heat between the high-temperature and high-pressure refrigerant compressed by the compressor 1 and the room air, and discharges the air heated by condensing the refrigerant to the room. Air is discharged into the room by blowing air from a fan in the indoor heat exchanger 3 rotated by a motor. The indoor heat exchanger 3 can open and close a heat exchanged air outlet (louver).
The throttle valve 4 depressurizes the refrigerant that has passed through the indoor heat exchanger 3.
The outdoor heat exchanger 5 exchanges heat between the low-temperature and low-pressure refrigerant decompressed by the throttle valve 4 and the outdoor air, and evaporates the refrigerant to release the cooled air to the outdoors. Air is discharged to the outside by blowing air from a fan in the outdoor heat exchanger 5 rotated by a motor. Here, “indoor” and “outdoor” mean indoors or outdoors of the room to be heated.

  The controller 6 can control the frequency and torque of the rotor of the compressor 1 and the operation of an air conditioner (system) such as the indoor heat exchanger 3, the four-way valve 4, and the outdoor heat exchanger 5. Further, the control unit 6 controls the opening and closing of the nucleation means 73 that nucleates the latent heat storage material 71 of the heat storage unit 7 and the first and second valves 8 and 9. The wiring for controlling the first valve 8 is L1. The wiring for controlling the second valve 9 is L2. The wiring for controlling the compressor 1 is L3. Although wiring for controlling other configurations is also included in the control unit 6, illustration and description thereof are omitted. The control unit 6 may include a terminal such as a remote control that can be wirelessly operated by the user. The control unit 6 includes an integrated circuit such as a microcomputer, an MPU (Micro Processing Unit), a DSP (Digital Signal Processor), or an FPGA (Field-Programmable Gate Array), and is controlled by software or hardware.

  The heat storage part 7 has the latent heat storage material 71, the heat storage heat exchanger 72, the nucleation means 73, and the heat storage container 74 which accommodates these, as shown to the cross-sectional conceptual diagram of FIG. The heat storage unit 7 is disposed in parallel with the outdoor heat exchanger 5 between the compressor 1 and the throttle valve 4. The latent heat storage material 71 is preferably a latent heat storage material having supercoolability. As the latent heat storage material 71, a heat storage material without supercooling property can also be used. As the latent heat storage material 71, for example, sodium acetate hydrate, sodium sulfate hydrate, erythritol and the like are used. In the latent heat storage material 71, a melting point adjusting agent such as ethylene glycol, sodium chloride or potassium chloride may be added in a range of about 30% by mass or less with respect to the latent heat storage material 71. It is preferable that the material is selected and the melting point is adjusted so that the melting point is higher than the air temperature, for example, within the range of 30 ° C. to 70 ° C. As the heat source of the latent heat storage material 71, exhaust heat, solar heat, underground heat, or the like during the operation of the compressor 1 can be used. The heat storage heat exchanger 72 is a device for exchanging heat between the refrigerant flowing through the second circulation path and the latent heat storage material 71 of the heat storage unit 7. The heat storage container 73 is preferably used as a container for the heat storage material 71.

  When the latent heat storage material 71 has a supercooling property, the nucleation method is composed of a method of inserting two electrodes into the latent heat storage material 71 and applying a voltage between the electrodes, a plate spring having unevenness and an actuator. , A method of moving a leaf spring in the latent heat storage material 71 with an actuator, a method of applying a voltage to a thermoelectric element in the latent heat storage material 71 and prompting the extreme location, and a crystal nucleus from the crystal nucleus storage container into the latent heat storage material 71 It is possible to use a method of nucleation by charging. Depending on the nucleation method, a necessary nucleation means 73 is provided at a place in contact with the latent heat storage material 71. In the figure, the nucleation means 73 is illustrated, but when the latent heat storage material 71 does not have supercooling properties, the nucleation means 73 can be omitted.

The first valve 8 is a valve that controls the inflow of refrigerant into the outdoor heat exchanger 5 by opening and closing. The second valve 9 is a valve that controls the inflow of refrigerant into the heat storage unit 7 by opening and closing. The first valve 8 is disposed between the throttle valve 4 and the outdoor heat exchanger 5. The second valve 9 is disposed between the throttle valve 4 and the heat storage unit 7.
A circulation path can be selected by a combination of opening and closing of the first and second valves 8 and 9. The first circulation path is a state in which the first valve 8 is open and the second valve is closed. The second circulation path is a state in which the first valve 8 is closed and the second valve 9 is opened.
Note that the valve may not be able to immediately control the inflow or shut-off of the refrigerant as it opens and closes. Therefore, the opening and closing of the valve is defined as follows. The ratio of the refrigerant inflow when the valve is open and the refrigerant inflow when the valve is closed is 100 (open): 1 (closed) when the refrigerant inflow is large when the valve is closed.

  The indoor heat exchanger 3 is provided with an indoor heat exchanger temperature measuring means 10 for measuring the refrigerant temperature in the indoor heat exchanger 3 or the temperature of the refrigerant flowing into and out of the indoor heat exchanger 3. Instead of the refrigerant, it is possible to measure and determine the temperature of the pipe that substantially matches the refrigerant temperature. The control unit 6 can control the rotational frequency of the rotor of the compressor 1 according to the temperature measured by the indoor heat exchanger temperature measuring means 10. As the temperature measuring means 10, for example, a device for measuring temperature such as an electric thermometer can be used.

  Next, the operation method of the heating cycle of the air conditioning system 100 will be described. FIG. 3 shows a flowchart according to the heating cycle operation method of the air-conditioning system 100 of the first embodiment. In addition, in embodiment, although the description regarding a cooling operation method is abbreviate | omitted, other operation methods, such as a cooling operation, may be contained in the air conditioning system.

FIG. 3 shows a flowchart according to the heating cycle operation method of the air conditioning system 100.
In step S01, the air conditioning system 100 operates a timer (step S01), and when an operation start command is issued (step S02), starts the first step operation (step S01 → step S02 → step S03). The first step is a preheating heating operation for heating the compressor 1, the refrigerant, and the heat exchangers 3 and 5 having a large heat quantity. In the operation of the first step, the control unit 6 operates by opening the first valve 8 and closing the second valve 9 to flow the refrigerant through the first circulation path (step S03).

  The timer (timer) is set in advance by the user (user), and when the time reaches the start state, the heating time of the user is learned, the control unit 6 automatically determines the start time, outside the air conditioner (for example, There is a method of receiving a command from a mobile phone or the like and determining the time. Moreover, on-off of a switching signal can be switched based on the timetable created based on the information of at least any one of an air conditioning system use frequency, external temperature, and the temperature of the indoor heat exchanger 3. FIG.

  In the first step, the temperature of the refrigerant or refrigerant pipe in the indoor heat exchanger 3 is measured by the indoor heat exchanger temperature measuring means 10, and the frequency of the compressor 1 is manipulated so that the measured value becomes a required value. (Step S04). Here, the required value can be set at a temperature higher than the outside air temperature and lower than the temperature of the refrigerant in the second step, and specifically takes a value between 30 ° C. and 50 ° C. it can. When the value measured by the temperature measuring means 10 is higher than the required value, the frequency of the rotor of the compressor 1 is reduced or stopped. As a rule, the louver of the indoor heat exchanger 3 is not opened and the hot air is not blown out.

  Next, when the switching signal is turned on in step S05, the operation is switched from the first step to the second step (step S05 → step S06). In the operation of the second step, the controller 6 operates the first valve 8 to be closed and the second valve 9 to be opened. In the second step, the switching signal is turned on, the refrigerant flow path is switched from the first circulation system path to the second circulation path, and the refrigerant is supplied to perform the heating operation. The conditions for turning on the switching signal in step S05 are shown in the chart of FIG.

  In FIG. 4A, the user gives a heating start command to the air conditioning system 100 to turn on the switching signal. For example, it is turned on by pressing the heating button on the remote control. In FIG. 4B, the switching signal is turned on based on a time table stored in advance. A schedule that is automatically turned on after a lapse of a certain time after the start of step S01 is recorded in the timetable. Moreover, the time etc. which memorize | store the time which uses a user's heating and are automatically turned on are recorded on the control part 6 previously. If the above condition is not satisfied, the switching signal remains off. If the switching signal is off, the switching signal is determined again in step S05 after the required time has elapsed. If the value measured by the temperature measuring means 10 is lower than the required value, the switching signal can be kept off. In this case, the determination of the switching signal may be performed when the value measured by the temperature measuring means 10 becomes equal to or greater than the required value.

When the process proceeds to the second step in step S05, in step S06, the control unit 6 operates the first valve 8 to open and the second valve 9 to close so that the refrigerant flows through the second circulation path. Drive. The refrigerant temperature in the indoor heat exchanger 3 as measured in the indoor heat exchanger temperature measuring means 10 after a predetermined time has elapsed, a determination is made whether the refrigerant temperature T _c reaches the required temperature T _{The set} (step S07 ). Note that T _set is a required value and may be a fixed value or a value that varies depending on the set temperature of the heating operation or the like. When T _c ≧ T _set , the fan rotation speed of the indoor heat exchanger 3 is increased, the louver of the indoor heat exchanger 3 is opened, and the indoor warm air blowing is started (step S08). The refrigerant absorbs heat from the heat storage material 71 of the heat storage unit 7 through the second circulation path, and the temperature of the refrigerant sucked into the compressor 1 rises. Therefore, the temperature of the refrigerant flowing through the compressor 1, the indoor heat exchanger 3, and the heat storage unit 7 rises, and warm air can be immediately supplied indoors when the hot air blowing is started in step S08. On the other hand, if T _c <T _set , it is preferable to perform the determination in step S07 again after the required time has elapsed. Before re-determination, if necessary, the rotational frequency of the rotor of the compressor 1 can be adjusted to raise the refrigerant temperature (step S09).

  When a heat storage material having a supercooling characteristic is used as the latent heat storage material 71, it is preferable to perform the nucleation operation of the heat storage material 71 by operating the nucleation means 74 when the process proceeds to the second step in Step S06. The heat storage material 71 starts to solidify by the nucleation operation, and solidification latent heat is generated. The generated latent heat of solidification is absorbed by the refrigerant that is in thermal contact with the heat storage heat exchanger 72.

  The first embodiment is characterized by switching to the second step after the first step and performing hot air blowing. This is because by preheating the indoor heat exchanger 3 and the compressor 1 housing in the first step, the heat of the refrigerant that has become high temperature in the second step is absorbed by these before reaching the room. This is to prevent it from falling out. By preheating, the refrigerant that has become high temperature in the heat storage unit 7 at the same time as switching to the second step can transport high-temperature heat into the room, and it is possible to shorten the rise time until hot air blows out. Further, in the first step, the frequency of the rotor of the compressor 1 is manipulated so that the temperature of the indoor heat exchanger 3 does not exceed the required temperature. Therefore, when the outside air temperature is low, the air conditioning system 100 moves to the outside air. The amount of heat that escapes can be reduced, and energy savings are possible.

  In addition, when hot air blowing is performed only in the first step without performing the second step (for example, steps S01 → S02 → S03 → S08), the refrigerant temperature cannot be rapidly heated in the heat storage unit 7. Therefore, the temperature of the refrigerant supplied to the indoor heat exchanger 3 is low, and a rise time until the hot air blows out is required. On the other hand, when the hot air blowing is performed only in the second step at the same time as the start without performing the first step (for example, steps S01 → S02 → S06 → S08), the indoor heat exchanger 3 and the compressor 1 Since the casing is cold, the heat of the refrigerant that has absorbed heat at the heat storage section 7 is absorbed by these devices before reaching the room, and the rise time until the hot air is blown out becomes very long. .

  As described above, in the embodiment of the present invention, in the first step, the indoor heat exchanger 3 and the compressor 1 housing are preheated, and in the second step, the first circulation path is changed to the second circulation path. By switching and supplying the heat absorbed from the heat storage unit 7 to the indoor heat exchanger 3 without any other heat absorption, it is possible to shorten the rise time until the hot air blows out.

[Second Embodiment]
FIG. 5 is a configuration diagram of a heating cycle 200 of the air-conditioning system according to the second embodiment.
The air conditioner (system) of the second embodiment includes a heat storage section refrigerant inflow temperature measuring means 11 that measures the temperature of the refrigerant flowing into the heat storage section 7 and a heat storage section refrigerant that measures the temperature of the refrigerant flowing out of the heat storage section 7. Except for further comprising the outflow temperature measuring means 12, it has the same configuration as the air conditioning apparatus (system) of the first embodiment. The refrigerant circulation path is the same as that of the air-conditioning apparatus (system) of the first embodiment.

  Next, the operation method of the heating cycle of the air conditioning system 200 will be described with reference to the flowchart of FIG. The air conditioning system of the second embodiment performs the heating operation by the third step after the second step of the first embodiment. Up to step S08 of the second step, the operation method of the first embodiment and the second embodiment is common, and the description thereof is omitted.

After starting the hot air blowing in step S08, the heat storage section inlet temperature measuring means 11 and the heat storage section outlet temperature measuring means 12 measure the inlet temperature (T _in ) and the outlet refrigerant temperature (T _out ) of the heat storage section 7, respectively. Then, the magnitude relationship between the measured value difference (T _out -T _in ) (ΔT) and the required value (T _l ), which is the judgment value, is determined (step S10). In the case of ΔT <T ₁ , in the third step, the control unit 6 operates the first valve to open and the second valve to close so that the flow path from the second circulation system path to the first circulation path And the operation is performed by flowing the refrigerant through the first circulation path (step S11). If ΔT> T _i , the determination in step S10 is performed again after the required time has elapsed. When the refrigerant outlet temperature absorbs heat from the heat storage unit 7 in the second step, the temperature of the heat storage material 71 decreases with time. When the temperature of the heat storage material 71 is low, there is a problem that the heat absorption amount of the refrigerant decreases and the heating capacity decreases. Therefore, in the present embodiment, the inlet temperature “T _in ” of the heat storage unit 7 and the refrigerant temperature “T _out ” of the outlet are measured, and when “T _out −T _in ” is lower than the required lower limit value, It is determined that the heat absorption amount is insufficient, and the flow is switched to the third step to flow the refrigerant through the first circulation path, and the outdoor heat exchanger 5 absorbs heat from the air. Here, the lower limit value of “T _out −T _in ” is recorded in advance in the control unit 6, and a required value can be used according to the operating conditions and the like. Therefore, also when the heat absorption from the heat storage part 7 falls, it becomes possible to suppress the fall of heating capability.

  In the first and second embodiments, when the refrigerant flows through the second circulation path, the refrigerant sucked into the compressor 1 by heating from the heat storage unit 7 becomes a high-temperature gas. When the refrigerant supplied to the compressor 1 is a high-temperature gas, it is possible to suppress the problem that the liquid refrigerant is supplied to the compressor 1 and the problem that the lubricity of the compressor 1 decreases at low temperatures. Therefore, df / dt, which is the maximum frequency increase rate when increasing the frequency of the compressor 1, is increased only when the refrigerant flows through the second circulation path. Hereinafter, the frequency of the rotor of the compressor 1 will be described with reference to the graph of FIG. In FIG. 7, the solid line indicates the rotational frequency of the rotor of the compressor 1 when the refrigerant flows through the first circulation system path. Moreover, the broken line in FIG. 7 shows the rotational frequency of the rotor of the compressor 1 when the refrigerant flows through the second circulation system path.

  Here, the frequency maximum increase rate is defined by the compressor frequency increase amount (Δf) per unit time (Δt), and is expressed by Expression (1).

Applicable when Δt> 0 and Δf> 0

When the maximum compressor frequency increase rate when the refrigerant flows through the first circulation path is df ₁ / dt, and the maximum compressor frequency increase rate when the refrigerant flows through the second circulation path, df ₂ / dt The frequency of the rotor of the compressor 1 is controlled so that Formula (2) is satisfied.

The values of df ₁ / dt and df ₂ / dt are recorded in the control unit 6 in advance. Then, by controlling the frequency of the compressor 1 under the condition of the expression (2), the circulation flow rate of the refrigerant is increased when flowing through the second circulation path with respect to the flow through the first circulation path, and the rise time It is possible to shorten the power consumption and increase the heating capacity.

  DESCRIPTION OF SYMBOLS 100, 200 ... Air conditioning apparatus (system), 1 ... Compressor, 2 ... Cooling / heating switching four-way valve, 3 ... Indoor heat exchanger, 4 ... Throttle valve, 5 ... Outdoor heat exchanger, P ... Piping, 6 ... Control part , 7 ... heat storage section, 8 ... first valve, 9 ... second valve, 10, 11, 12 ... temperature measuring means, 71 ... latent heat storage material, 72 ... latent heat heat exchanger, 73 ... nucleation means, 74 ... Heat storage material container, L ... Wiring, P ... Piping

Claims (9)

A compressor, a cooling / heating switching four-way valve, an indoor heat exchanger, a throttle valve, an outdoor heat exchanger, piping, a heat storage unit having a heat storage material, a control unit, a first valve, and a second valve A valve,
The pipe forms a circulation circuit for circulating a refrigerant between the compressor, the indoor heat exchanger, and the outdoor heat exchanger,
The compressor is disposed in a circulation circuit between the outdoor heat exchanger and the indoor heat exchanger,
The four-way valve is disposed between the compressor and the indoor heat exchanger and between the compressor and the outdoor heat exchanger,
The throttle valve is disposed across the indoor heat exchanger and the outdoor heat exchanger of the circulation circuit,
The heat storage unit is disposed between the compressor and the throttle valve,
The first valve is disposed between the throttle valve and the outdoor heat exchanger,
The second valve is disposed between the throttle valve and the heat storage unit,
A first circulation path for circulating a refrigerant between the compressor, the indoor heat exchanger, and the outdoor heat exchanger;
A second circulation path for circulating a refrigerant between the compressor, the indoor heat exchanger, and the heat storage unit;
After the first step of circulating the refrigerant in the first circulation system path, the control unit performs the heating operation in the second step of circulating the refrigerant in the second circulation system path. An air conditioning system that controls opening and closing of the second valve.   The air conditioning system according to claim 1, wherein the control unit switches from the first step to the second step based on a switching signal.   The air conditioning system according to claim 1 or 2, wherein the first step is started at a time previously registered by a timer.   The air conditioning system according to claim 2 or 3, wherein the switching signal is switched according to a command from an air conditioning system user.   5. The control unit according to claim 2, wherein the control unit switches the switching signal based on at least one of an air conditioning system usage frequency, an outside air temperature, and an indoor heat exchanger temperature. Air conditioning system.   6. The maximum frequency increase rate of the compressor rotor in the second step is faster than the maximum frequency increase rate of the compressor rotor in the first step. The air conditioning system according to any one of the above.   In the second step, the refrigerant temperature at the inlet of the heat storage section and the refrigerant temperature at the outlet are measured, and when the difference between the measured outlet temperature and the inlet temperature is lower than a required value, the first circulation path The air conditioning system according to claim 1, wherein the air conditioning system is switched to a circulation path.   The frequency of the rotor of the compressor is adjusted so that the temperature of the indoor heat exchanger becomes smaller than a required value in the first step. Air conditioning system. The heat storage material has supercooling properties,
The heat storage unit has a supercooling release means for the heat storage material,
The air conditioning system according to any one of claims 1 to 8, wherein the supercooling of the heat storage material is released when the first step moves to the second step.