JP2008082589A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent shortage of heating capacity in defrosting an air conditioner. <P>SOLUTION: The control device 20 controls at least any of a rotating speed of a compressor 1, pressure reduction of a pressure reducing means 4, a rotating speed of an indoor blower fan 12 and a rotating speed of an outdoor blower fan 13 on the basis of a temperature sensor 10 around a heat storage body 9 in storing heat. A means for determining melting of heat storage material is disposed in the control device, so that a part between an indoor heat exchanger and a four-way valve 2 and a part between an outdoor heat exchanger and the pressure reducing means are shorted when the means for determining melting of heat storage material determines the melting of the heat storage material, and the four-way valve is switched to allow a refrigerant of high temperature to flow into the outdoor heat exchanger when it is determined that the heat storage material is not melted in defrosting under air heating. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner that defrosts an outdoor heat exchanger using heat storage of a heat storage means.

  In an air conditioner, a patent is established that balances the heating capacity and defrosting capacity during the defrosting operation and switches the three-way valve to switch between the heating operation and the defrosting operation in order to make the heat storage tank compact. It is described in Document 1. In Patent Document 1, a heat exchanger that shares a common refrigerant pipe for heating and receiving heat is provided in the heat storage layer. Furthermore, the high-temperature refrigerant | coolant from a compressor is also guide | induced to a condenser using a capillary tube, and the balance of heating capability and defrosting capability is aimed at. In this air conditioner, a heat storage material such as sodium acetate is housed in the heat storage tank.

JP-A-5-26542

  In the air conditioner described in Patent Document 1, a heat storage material such as sodium acetate provided inside the heat storage tank is heated with the refrigerant discharged from the compressor, and the heat is used to heat the room to the evaporator. The attached frost is defrosted. However, in this air conditioner, the specific procedure for defrosting is not fully taken into account, and there is a risk that effective use of the heat storage material may be difficult. This is because if a latent heat storage material such as sodium acetate is used, the heat storage capability of the heat storage material cannot be exhibited unless the temperature of the heat storage material is heated to the melting point or higher. That is, when the temperature of the refrigerant that exchanges heat with the heat storage material is low, the heat storage material is not melted and cannot be used as a heat source for defrosting. As a result, a situation in which the heating capacity and the defrosting capacity are insufficient occurs.

  This invention is made | formed in view of the malfunction of the said prior art, The objective is to avoid the shortage of a heating capability or a defrosting capability in the air conditioning apparatus which can attach a thermal storage means.

  A feature of the present invention that achieves the above object is that, in an air conditioner that stores heat using a latent heat storage material, at the time of heat storage, based on the output of a temperature sensor provided near the latent heat storage material, at least the rotational speed of the compressor, compression A control device is provided for controlling any one of the discharge temperature of the machine, the amount of decompression of the decompression means, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan.

  And in this feature, the control device may control the discharge temperature of the compressor at the time of heat storage so as to be higher than at the time other than at the time of heat storage. When defrosting at the time of heating, if the control device determines that the heat storage material is melted, it is provided between the indoor heat exchanger and the four-way valve between the outdoor heat exchanger and the pressure reducing device. If the bypass line is opened and it is determined that the heat storage material is not melted, the four-way valve may be switched to allow the high-temperature refrigerant discharged from the compressor to flow into the outdoor heat exchanger.

  Another feature of the present invention that achieves the above object is that a compressor, a four-way valve, an indoor heat exchanger, a decompression means, and an outdoor heat exchanger are connected by piping in sequence, and an indoor room disposed in the vicinity of the indoor heat exchanger. A blower fan, an outdoor blower fan disposed in the vicinity of the outdoor heat exchanger, and a control device that controls the compressor, the decompression means, the indoor heat exchanger, and the outdoor heat exchanger. Heat storage mode that stores heat with the heat of the refrigerant circulating in the refrigeration cycle in the latent heat storage means that can be placed between the compressor and the compressor, and heat dissipation that heats the refrigerant circulating in the refrigeration cycle with the heat stored in the latent heat storage means During operation of the heat storage operation mode, the compressor rotation speed or discharge temperature, the decompression amount of the decompression means, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan during execution of the heat storage operation mode At least And controls the or Re.

  In this feature, it is preferable that the control device controls the discharge temperature of the compressor to be higher than when the heat storage operation mode is not being executed while the heat storage operation mode is being executed. A hot gas bypass channel that guides the refrigerant to the outdoor heat exchanger may be provided. Further, the control device has a defrosting operation mode for defrosting the outdoor heat exchanger and a determination unit for determining melting of the heat storage material of the latent heat storage unit, and the determination unit stores the heat during the defrosting operation mode. When it is determined that the material is not melted, the controller switches the four-way valve to guide the high-temperature refrigerant to the outdoor heat exchanger and then guides it to the indoor heat exchanger, or opens the hot gas bypass flow path. May be.

  According to the present invention, in the air conditioner to which the heat storage means can be attached, even if the defrosting is performed during the heating operation, the shortage of the heating capacity and the defrosting capacity can be avoided. Moreover, according to this invention, in addition to hot gas bypass defrosting, refrigerant | coolant heating is also attained.

  Hereinafter, some embodiments of an air conditioner according to the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an embodiment of an air conditioner 100 according to the present invention, and FIG. 2 is a time chart for explaining the operation of the air conditioner 100. In the air conditioner 100 shown in the present embodiment, the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the decompression means 4, and the outdoor heat exchanger 5 are sequentially connected by pipes using refrigerant pipes 90. An electric expansion valve is used for the decompression means 4.

  A bypass pipe 6 connects an intermediate part of a pipe 90 a connecting the four-way valve 2 and the indoor heat exchanger 3 and an intermediate part of a pipe 90 b connecting the decompression means 4 and the outdoor heat exchanger 5. A two-way valve 7 is disposed in the middle of the bypass pipe 6. In the middle of the pipe connecting the four-way valve 2 and the indoor heat exchanger 3, a heat storage unit 8 described later in detail is arranged. An outdoor blower fan 13 is disposed in the vicinity of the outdoor heat exchanger 5, and an indoor blower fan 12 is disposed in the vicinity of the indoor heat exchanger 3.

  A heat storage unit 9 including a latent heat storage material is accommodated in the heat storage unit 8. The heat storage body 9 exchanges heat with the refrigerant flowing into the indoor heat exchanger 3. A temperature sensor 10 that detects the temperature of the heat storage body 9 is attached to a side surface of the heat storage body 9. The temperature of the heat storage body 9 detected by the temperature sensor 10 is input to the control device 11. When the temperature of the heat storage body 9 detected by the temperature sensor 10 is lower than the melting point of the heat storage material, the control device 11 increases the rotation speed of the compressor 1 by a predetermined rotation speed.

  The control device 11 also receives the rotational speeds of the indoor fan 12 and the outdoor fan 13 and the degree of pressure reduction of the pressure reducing means 4, and the control device 11 also controls these various amounts. Note that the decompression means 4 is an electric expansion valve in this embodiment, and the degree of decompression is expressed by its opening. The two-way valve 7 is an on-off valve such as an electromagnetic valve.

  The operation of the air conditioner 100 according to the present embodiment configured as described above will be described in detail below. In FIG. 1, a solid line arrow indicates the flow of the refrigerant in the pipe 90 during heating, and a broken line arrow indicates the flow of the refrigerant in the pipe 90 during defrosting. When the four-way valve 2 is switched as shown by a solid line, a heating operation is performed, and when the four-way valve 2 is switched as shown by a broken line, a cooling operation is performed.

  (1) Heating operation: In the heating operation, when the temperature of the heat storage body 9 is lower than its melting point, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows into the heat storage unit 8 through the four-way valve 2. To do. The high-temperature refrigerant gas heats the regenerator 9 and loses part of the heat, but it is still hot enough. This refrigerant gas flows into the indoor heat exchanger 3.

  Since the indoor blower fan 12 is disposed in the vicinity of the indoor heat exchanger 3, the air blown by the indoor blower fan 12 and the refrigerant gas exchange heat. The refrigerant gas dissipates heat and condenses, and the temperature decreases. The condensed refrigerant is decompressed to a low temperature and a low pressure by the electric expansion valve 4. When the refrigerant having become low temperature and low pressure flows through the outdoor heat exchanger 5, the refrigerant absorbs heat from the air blown by the outdoor fan 12 and evaporates. The low-temperature and low-pressure refrigerant gas exiting the outdoor heat exchanger 5 returns to the compressor 1 again via the four-way valve 2. In this heating operation, the two-way valve 7 provided in the bypass pipe 6 is kept closed.

  At this time, the temperature of the heat storage body 9 detected by the temperature sensor 10 provided in the heat storage unit 8 is lower than its melting point. Therefore, as shown in FIG. 2, the control device 11 controls the compressor 1 so that the rotational speed of the compressor 1 is increased by a predetermined rotational speed (for example, 200 rpm). Since the rotation speed of the compressor 1 is increased, the circulation amount of the refrigerant is increased. As a result, the heat absorption amount in the evaporator is increased, and the heating capacity is increased. The temperature of the refrigerant flowing into the heat storage unit 8 rises, and the heat storage body 9 is further heated and melts easily.

  Thereby, the heat storage amount of the heat storage body 9 increases. If the compressor 1 is continuously operated in this state and the heat storage body 9 is sufficiently heated, the temperature of the heat storage body 9 eventually becomes equal to or higher than the melting point of the heat storage material. At this time, the control device 11 reduces the rotational speed of the compressor 1 to return to the reference rotational speed. That is, the amount of decrease in the rotational speed is 200 rpm, which is the amount increased earlier.

  (2) Defrosting operation: When the temperature of the outdoor heat exchanger 5 acting as an evaporator is lower than a predetermined temperature, moisture in the air is condensed as frost on the outer surface of the outdoor heat exchanger 5. In a state where the outdoor heat exchanger 5 is frosted, the heat exchange capability of the outdoor heat exchanger 5 is reduced, so that a defrosting operation is required. In the defrosting operation, the two-way valve 7 of the bypass pipe 6 is opened. Since the two-way valve 7 is opened, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 passes through the four-way valve 2, and a part thereof flows into the outdoor heat exchanger 5 through the bypass pipe 6. Since the refrigerant (hot gas) flowing through the bypass pipe 6 that bypasses the indoor heat exchanger 3 is at a high temperature, the refrigerant heats the outdoor heat exchanger 5 and melts frost attached to the outer surface of the outdoor heat exchanger 5. The defrosting operation is executed by so-called hot gas bypass operation.

  In this defrosting operation, the outdoor heat exchanger 5 does not act as an evaporator, and a part of the refrigerant flows into the compressor 1 in a liquid state having a low temperature. When the refrigerant including the refrigerant having a low temperature flows into the compressor 1, the inlet temperature of the compressor 1 is lowered. Further, since the refrigerant is not sufficiently compressed in the compressor 1, the refrigerant having a low temperature is discharged from the compressor 1.

  By the way, among the refrigerant discharged from the compressor 1, the refrigerant that does not flow into the bypass pipe 6 and flows into the indoor heat exchanger 3 in the same manner as in the heating operation is stored in the refrigerant before flowing into the indoor heat exchanger 3. The body 9 absorbs heat and rises in temperature. As a result, since the high-temperature refrigerant still flows into the indoor heat exchanger 3, it is possible to suppress a decrease in heating capacity during the defrosting operation.

  In the conventional air conditioner, a part of the heat generated by the compressor 1 is used to heat the outdoor heat exchanger 5 during defrosting, causing a reduction in heating capacity. In the present embodiment, the circuit of the refrigeration cycle is configured so as to compensate for the decrease in heating capacity with the heat stored in the heat storage body 9. And the temperature of the thermal storage body 9 is raised previously more than melting | fusing point of a thermal storage material, and it heat-stores in the thermal storage body 9 at the time of heating, and it is possible to fully exhibit the performance of the thermal storage body 9.

  In the present embodiment, the rotational speed of the compressor is increased when the temperature of the heat storage body 9 is lower than the melting point of the heat storage material, but instead of increasing the rotational speed of the compressor 1, the pressure reduction amount of the decompression means 4 is increased. Or the rotational speed of the outdoor fan 13 or the indoor fan 12 may be increased. When the amount of decompression of the decompression means 4 is increased, the evaporation pressure is lowered and the degree of superheat of the suction portion of the compressor 1 is increased. At the same time, the degree of superheat at the outlet of the compressor 1 also increases, and the temperature of the refrigerant that exchanges heat with the heat storage body 9 increases. At this time, there is no need to increase the rotational speed of the compressor 1, the indoor air blowing fan 12, and the outdoor air blowing fan 13, and there is no possibility that noise will increase both indoors and outdoors.

  When the rotational speed of the outdoor blower fan 13 is increased, the refrigerant evaporation in the outdoor heat exchanger 5 is promoted. And the superheat degree of the suction part of the compressor 1 rises, and the outlet superheat degree of the compressor 1 also rises with it. Thereby, the temperature of the refrigerant | coolant which heat-exchanges with the thermal storage body 9 rises. At this time, there is no need to increase the rotation speed of the indoor fan 12, so there is no possibility that the noise in the room will increase.

  Another embodiment of the air conditioner 100 according to the present invention will be described with reference to FIGS. FIG. 3 is a system diagram of the air conditioner 100, and FIG. 4 is a time chart for explaining its operation. This embodiment is different from the above embodiment shown in FIG. 1 in that a temperature sensor for detecting the discharge temperature of the compressor 1 is provided in the compressor 1. The control device 14 increases the target discharge temperature of the compressor 1 by a predetermined value when the temperature of the heat storage body 9 detected by the temperature sensor 10 attached to the heat storage body 9 is lower than the melting point of the heat storage material.

  The operation of the air conditioner described in the present embodiment configured as described above will be described below.

(3) During heating operation, when the temperature of the heat storage body 9 is lower than the melting point of the heat storage material: Since the temperature of the heat storage body 9 detected by the temperature sensor 10 is lower than the melting point of the heat storage material, the control device 14 4, the target discharge temperature of the compressor 1 is increased by a predetermined temperature (for example, 10 ° C.). The pressure-enthalpy diagram (Molière diagram) at this time is schematically shown in FIG.

  In the Mollier chart of FIG. 5, the horizontal direction is the enthalpy of the refrigerant circulating in the air conditioner 100, and the vertical direction is the pressure. When the air conditioner 100 is controlled in a normal operation, the refrigerant flowing through the air conditioner 100 follows a locus indicated by a broken line on the Mollier chart. On the other hand, when the target discharge temperature of the compressor 1 is increased by 10 ° C., the refrigerant changes as indicated by the solid line in FIG. That is, the diagram is slightly larger than the original diagram. Specifically, the point A corresponding to the suction state of the compressor 1 changes to the point α, and the point B corresponding to the discharge state of the compressor changes to the point β. Point C corresponding to the suction state of the decompression means 4 changes to point γ, and point D corresponding to the discharge state of the expansion valve changes to point δ.

Since the target discharge temperature of the compressor 1 was changed, the curve CL indicating the phase change of the refrigerant and the indoor heat exchanger 3
The point of intersection with the straight line indicating the change in refrigerant state changes from point E to point ε. In FIG. 5, the region on the right side of the points E and ε is the superheated gas region. Therefore, when the target discharge temperature of the compressor 1 is increased, the superheated gas region of the discharge unit increases.

  The refrigerant whose superheated area has increased flows into the heat storage unit 8 disposed on the inlet side of the indoor heat exchanger 3. As a result, the heat storage body 9 is further heated and easily melted, and the heat storage amount of the heat storage body 9 increases. This operation state is continued and the heat storage body 9 is sufficiently heated. When the temperature of the heat storage body 9 becomes equal to or higher than the melting point of the heat storage material, the control device 11 reduces the target discharge temperature of the compressor 1 to the reference target temperature and returns to the normal operation mode.

  (4) Defrosting operation: A circuit configuration similar to that of the embodiment shown in FIG.

  In this embodiment, the operation of the air conditioner 100 during heating is controlled so that the discharge temperature of the compressor 1 becomes the target discharge temperature.

  Still another embodiment of the air conditioner according to the present invention is shown in a system diagram of FIG. Also in the present embodiment, heat is stored in the heat storage unit 8 during the heating operation as in the above embodiments. Therefore, the circuit configuration at the time of heating operation is the same as that in each of the above embodiments. On the other hand, in order to use the heat stored in the heat storage unit 8 in the defrosting operation, a bypass pipe 18 through which the refrigerant discharged from the compressor 1 bypasses the heat storage unit 8 is provided. The bypass pipe 18 is provided with a two-way valve 19 in order to prevent refrigerant from flowing through the pipe 18 during normal heating operation. In FIG. 6, in order to avoid complexity, the control device 11 does not show lines for controlling the decompression unit 4, the indoor / outdoor blower fans 12 and 13, the valves 2, 16, and 19.

  A three-way valve 16 is provided on the outlet side of the outdoor heat exchanger 5 and guides the refrigerant to the four-way valve 2 during normal heating operation. One opening of the three-way valve 16 communicates with the heat storage unit 8, and during the defrosting operation, the refrigerant exchanges heat with the heat storage body 9 in the heat storage unit 8 through this communication path 17 a and the temperature rises. The refrigerant whose temperature has risen is guided to the four-way valve 2 through the pipe 17b. In this embodiment, the three-way valve 16 is used to change the refrigerant flow during heating and defrosting, but a two-way valve may be used instead of the three-way valve 16. In the case of the two-way valve, a part of the refrigerant flows to the heat storage unit 8 even during heating, but since the pipe loss is larger in the flow path to the heat storage unit 8, most of the refrigerant does not flow to the heat storage unit 8 side. Since it flows to the four-way valve 2 side, there is substantially no influence.

  At the time of defrosting, the mixed refrigerant flowing out of the outdoor heat exchanger 5 is heated by the heat storage material. That is, when the electric expansion valve 4 is opened, a refrigeration cycle using the heat storage unit 8 as an evaporator is established, and the heating operation can be performed even during the defrosting operation. Thereby, the indoor heat exchanger 3 and the outdoor heat exchange 5 become high pressure and high temperature, and the outdoor heat exchanger 5 performs defrosting using this heat. Thereafter, the refrigerant is depressurized by the resistance of the three-way valve 16 and the pipe 172 and becomes a low temperature and low pressure. The refrigerant absorbs heat from the heat accumulator 9 and evaporates, and then returns to the compressor 1.

Another embodiment of the above embodiment according to the air conditioner 100 will be described with reference to FIGS. In these drawings, the same reference numerals as those in the above embodiments denote the same parts. In these drawings, the illustration of the control command line from the control device 11 is partially omitted. FIG. 7 shows a normal heating operation state in which heating is performed while storing heat in the heat storage unit 8. In FIG. 7, the control device 11 controls the rotational speed of the compressor 1, the indoor / outdoor blower fans 12, 13, and the like using the temperature of the heat storage body 9 detected by the temperature sensor 10.

  When the temperature detected by the temperature sensor 10 is lower than the melting point of the heat storage material, the control device 11 determines that the heat storage body 9 has a portion that has not yet melted. In this state, when a defrosting operation signal is detected from a defrosting sensor (not shown) attached to the outdoor heat exchanger 5, the control device 11 switches to the defrosting operation (see FIG. 8). At that time, since the heat storage body 9 is not completely melted, the control device can be used if the amount of heat necessary for heating the indoor heat exchanger 3 cannot be obtained even if the amount of heat stored in the heat storage unit 8 is used. 11 is judged. In this case, since it is difficult to achieve both heating and defrosting, the four-way valve 2 is switched to direct the high-temperature refrigerant discharged from the compressor 1 directly to the outdoor heat exchanger 5, so-called “reverse cycle defrosting”. Execute. That is, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows into the outdoor heat exchanger 5 and consumes the heat of the refrigerant gas for melting the frost in the outdoor heat exchanger 5 for a short time, thereby removing the defrost. Drive with priority.

  When the temperature detected by the temperature sensor 10 is higher than the melting point of the heat storage material, the control device 11 determines that the heat storage body 9 is completely melted. In the state in which the heat accumulator 9 is completely melted, it is possible to achieve both defrosting and heating. Therefore, when a defrost signal is detected from a defrost sensor (not shown), the control device 11 normally opens the four-way valve 2. In the heating operation state, the bypass valve 7 is opened to switch to the defrosting operation (see FIG. 9). Since the bypass valve 7 is opened, a part of the high-temperature refrigerant flows into the outdoor heat exchanger 5 and so-called “hot gas bypass defrosting” is executed.

  In this “hot gas bypass defrosting”, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 passes through the four-way valve 2, and a part thereof flows into the outdoor heat exchanger 5 through the bypass pipe 6. And the outdoor heat exchanger 5 is warmed and defrosted. In this state, since the outdoor unit heat exchanger 5 does not act as an evaporator, refrigerant gas containing liquid refrigerant having a low temperature flows into the compressor 1.

  Since the refrigerant flows into the compressor 1 in the form of a gas containing liquid, the inlet temperature of the compressor 1 is reduced, the compression efficiency of the compressor 1 is reduced, and the temperature is not sufficiently increased without being compressed sufficiently. The refrigerant is discharged from the compressor 1. Although the refrigerant discharged from the compressor 1 is lower than a predetermined temperature, a heat storage unit 8 is provided upstream of the indoor heat exchanger 3, and the heat storage unit 8 has a heat storage body 9 that stores a predetermined amount of heat. Therefore, before flowing into the indoor heat exchanger 3, the refrigerant absorbs heat from the heat accumulator 9 and rises in temperature. As a result, a high-temperature refrigerant that is not so different from that in the normal heating operation flows into the indoor heat exchanger 3, and a decrease in heating capacity can be suppressed.

  According to the present embodiment, the defrosting operation is performed using the heat of the heat storage body 9 only when the heat storage body 9 has been melted to compensate for the lack of heating capacity during the defrosting operation. The performance of the body 9 can be fully exhibited. Moreover, when the heat of the heat storage body cannot be used, the reverse cycle defrosting is used to quickly defrost and the time during which heating cannot be performed is shortened as much as possible, so that discomfort due to insufficient heating by the user of the air conditioner can be reduced.

  As the heat storage material described in the above embodiments, for example, sodium acetate can be used. Sodium acetate can store heat in a supercooled state at room temperature, and can maintain supercooling all day and night. Further, the supercooling can be released by physical means such as vibration, and can be easily used for heating the refrigerant. Thus, according to each Example of this invention, the heat of a thermal storage material can be utilized effectively at the time of winter start-up in a cold district etc., and the discomfort by insufficient heating of an air conditioning apparatus can be reduced.

The system figure of one Example of the air conditioning apparatus which concerns on this invention. The figure explaining control of the control apparatus which the air conditioning apparatus shown in FIG. 1 has. The system figure of the other Example of the air conditioning apparatus which concerns on this invention. The figure explaining control of the control device which the air harmony device shown in Drawing 3 has. It is a figure explaining operation | movement of the air conditioning apparatus shown in FIG. 3, and the Mollier diagram shown typically. The system diagram of the modification of the air conditioning apparatus shown in FIG. The system figure of the further another Example of the air conditioning apparatus which concerns on this invention. The figure explaining operation | movement of the air conditioning apparatus shown in FIG. The figure explaining operation | movement of the air conditioning apparatus shown in FIG.

Explanation of symbols

1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Electric expansion valve (pressure reduction means)
5 Outdoor heat exchangers 6, 17, 18 Bypass piping 7 Two-way valve (bypass valve)
8 Heat storage unit 9 Heat storage body 10 Temperature sensor 11 Control device 12 Indoor fan 13 Outdoor fan 16 Three-way valve 19 Two-way valve 90 Piping 100 Air conditioner

Claims (8)

  In an air conditioner that stores heat using a latent heat storage material, at the time of heat storage, based on the output of a temperature sensor provided in the vicinity of the latent heat storage material, at least the rotational speed of the compressor, the discharge temperature of the compressor, the amount of pressure reduction of the pressure reducing means An air conditioner provided with a control device for controlling either the rotational speed of the indoor fan or the rotational speed of the outdoor fan.   The air conditioner according to claim 1, wherein the control device controls the discharge temperature of the compressor to be higher at the time of heat storage than at a time other than at the time of heat storage.   The control device has melting determination means for determining melting of the heat storage material. When defrosting during heating, the control device determines that the heat storage material is melted when the control device determines that the heat storage material is melted. Open the bypass pipe between the outdoor heat exchanger and the decompression means between the two-way valve and the four-way valve, and if it is determined that the heat storage material has not melted, switch the four-way valve to remove the high-temperature refrigerant discharged from the compressor. The air conditioner according to claim 1, wherein the air conditioner is caused to flow into an outdoor heat exchanger.   A refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a decompression unit, and an outdoor heat exchanger are connected in series, an indoor fan disposed in the vicinity of the indoor heat exchanger, and in the vicinity of the outdoor heat exchanger An outdoor fan that is arranged, and a control device that controls the compressor, the decompression means, the indoor heat exchanger, and the outdoor heat exchanger, and the control device is arranged between the indoor heat exchanger and the compressor. A heat storage operation mode in which the latent heat storage means stores heat with the heat of the refrigerant circulating in the refrigeration cycle, and a heat dissipation operation mode in which the refrigerant circulating in the refrigeration cycle is heated with heat stored in the latent heat storage means, During execution of the heat storage operation mode, at least one of the rotation speed or discharge temperature of the compressor, the amount of pressure reduction of the pressure reduction means, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan is controlled based on the temperature of the latent heat storage means. An air conditioning apparatus characterized by.   5. The air conditioner according to claim 4, wherein the control device controls the discharge temperature of the compressor to be higher during execution of the heat storage operation mode than when the heat storage operation mode is not being executed.   The air conditioner according to claim 4 or 5, wherein a hot gas bypass passage is provided in the refrigeration cycle to guide the high-temperature refrigerant discharged from the compressor to the outdoor heat exchanger.   The control device includes a defrosting operation mode for defrosting the outdoor heat exchanger and a determination unit that determines melting of the heat storage material of the latent heat storage unit. During the execution of the defrosting operation mode, the determination unit stores the heat. 5. The control device performs control to switch the four-way valve to guide the high-temperature refrigerant to the outdoor heat exchanger and then to the indoor heat exchanger when it is determined that the material is not melted. The air conditioning apparatus described in 1. The control device includes a defrosting operation mode for defrosting the outdoor heat exchanger and a determination unit for determining melting of the heat storage material included in the latent heat storage unit, and the determination unit stores the heat during the defrosting operation mode. The air conditioner according to claim 6, wherein when the material is determined to be melted, the hot gas bypass channel is opened.

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