JP4308090B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner including a total heat exchange element.

  In general, an air conditioner including a compressor, a heat source side heat exchanger, and a use side heat exchanger is known. The operation of the air conditioner is performed, for example, with the room closed. In this way, when the room is closed for a long time, the air in the room becomes dirty, so there is an air conditioner that performs ventilation to take in fresh air outside the room. In addition, when performing such ventilation, it is desirable that the temperature in the room does not vary much. Therefore, in the above-described air conditioner, there is a device provided with a total heat exchange element for exchanging heat between the inside air discharged to the outside and the outside air supplied to the room during indoor ventilation (for example, Patent Document 1). reference).

Moreover, the said air conditioning apparatus is equipped with the thermal storage coil in the ice thermal storage tank, and what made the ice making operation | movement which produces | generates ice in an ice thermal storage tank is known. In this type of air conditioner, for example, in summer, ice making operation is performed at night or the like, and liquid refrigerant from the heat source side heat exchanger is supplied to the heat storage coil in the heat storage tank in the daytime or the like to be in a supercooled state, This supercooled liquid refrigerant is supplied to the use side heat exchanger to perform an ice-free cooling operation for cooling the room.
JP 2001-235200 A

  However, in the above air conditioner, if the indoor heat load is low during the cooling operation, the evaporation temperature of the use side heat exchanger may be lowered, and therefore the use side heat exchanger is likely to be frozen. Therefore, when the usage-side heat exchanger is about to freeze, the compressor is stopped and the pressure inside the refrigerant circuit is controlled to prevent freezing of the usage-side heat exchanger. There has been a problem that the operation of the air conditioner becomes unstable, such as that it takes time to restart the machine and repeats starting and stopping of the compressor.

  In addition, if the indoor heat load is low during the ice-freezing cooling operation, the evaporation temperature of the use-side heat exchanger may become low, so that the ice remains in the ice heat storage tank without being completely thawed. was there. When ice remains in the ice heat storage tank in this way, the bridging phenomenon occurs in which the ice adhering to the heat storage coil comes into contact with each other, the heat storage coil is deformed, and the pressure loss of the refrigerant increases. There has been a problem that the operation of the harmony device becomes unstable.

  Therefore, an object of the present invention is to provide an air conditioner that can solve the problems of the conventional techniques described above and can perform a stable operation by increasing the refrigerant evaporation temperature of the use side heat exchanger.

In order to solve the above problems, the present invention integrates an air conditioner main body having a use side heat exchanger and a ventilator main body having a total heat exchange element, and makes the air outlets of the respective main bodies independent of each other. It has an internal air circulation air passage that leads to the utilization side heat exchanger and leads to the room through the air outlet of the air conditioner body, and the outside air that has been heat-exchanged by the total heat exchange element is connected to the air outlet of the ventilator body. The air conditioner is provided with an outside air introduction air passage that leads to the room through the interior, and the outside air introduction air passage is disposed adjacent to an upper portion of the inside air circulation air passage, and partitions the outside air introduction air passage and the inside air circulation air passage. In the upper part of the main body, a damper is provided on the downstream side of the use side fan that blows air to the use side heat exchanger so as to face the vicinity of the use heat exchanger, and the evaporation temperature of the refrigerant in the use side heat exchanger is set in advance. When the temperature falls below the specified temperature It is characterized in that it comprises a control means for opening the damper.

  In this air conditioner, the damper may block the air outlet of the ventilator body when the damper is open.

Moreover, the said air conditioning apparatus WHEREIN: The said damper may be formed so that it may extend over the width direction of the said utilization side heat exchanger.

  According to the air conditioner of the present invention, it is possible to perform a stable operation by increasing the refrigerant evaporation temperature of the use side heat exchanger.

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

  FIG. 1 is a pipeline diagram illustrating an air conditioner 10 including an ice heat storage unit to which an embodiment of an air conditioner according to the present invention is applied. Moreover, FIG. 2 is the perspective view which looked at the utilization side unit 13 of the air conditioning apparatus 10 from the bottom. FIG. 3 is a cross-sectional view showing the use side unit 13 of the air conditioner 10.

  As shown in FIG. 1, the air conditioner 10 includes a heat source unit 11, an ice heat storage unit 12 as a heat storage unit, and a use side unit 13. Refrigerant pipes 15 and 15B connecting the refrigerant pipe 14 of the heat source side unit 11 and the refrigerant pipe 30 of the use side unit 13 are connected by the refrigerant pipes 16 and 17 of the ice heat storage unit 12. The refrigerant pipe 15 </ b> A is connected to the refrigerant pipe 16, and the refrigerant pipe 15 </ b> B is connected to the refrigerant pipe 17.

  The heat source side unit 11 and the ice heat storage unit 12 are installed, for example, outdoors, and the use side unit 13 is installed in a room that is an air-conditioned room.

  The heat source side unit 11 includes a variable capacity compressor 18, an accumulator 19, a four-way valve 20, a heat source side heat exchanger 21, an electric expansion valve (decompressor) 22, and a receiver tank 23. A compressor 18 is disposed on the pipe 14, an accumulator 19 is disposed on the suction side of the compressor 18, and a four-way valve 20 is disposed on the discharge side. The heat source side heat exchanger 21 and an electric expansion valve are disposed on the four-way valve 20. 22 and the receiver tank 23 are sequentially connected through the refrigerant pipe 14. Furthermore, the heat source side unit 11 includes a heat source side blower 24 that blows air to the heat source side heat exchanger 21.

  The use side unit 13 includes a use side heat exchanger 25 and an electric expansion valve (decompressor) 26, and the use side heat exchanger 25 is disposed in the refrigerant pipe 30, and the use side heat exchanger 25 is provided in the refrigerant pipe 30. An electric expansion valve 26 is disposed in the vicinity. The opening degree of the electric expansion valve 26 is adjusted according to the air conditioning load. Further, the use side unit 13 includes a use side blower 27 that blows air to the use side heat exchanger 25, and after the air exchanges heat with the refrigerant in the use side heat exchanger 25, the air is blown into the conditioned room. Moreover, the use side unit 13 is provided with the ventilation apparatus 50 which ventilates a room. This ventilation device 50 is housed integrally in the housing of the use side unit 13 in which the various devices 25, 26, 27, etc. for air conditioning are housed.

  The ice heat storage unit 12 includes an ice heat storage tank 36 as a heat storage tank that houses the heat storage coil 35, and a receiver tank 37, an electric expansion valve 38, and a first electromagnetic valve 41 are connected to the refrigerant pipe 16 on the heat source side unit 11 side. To the use side unit 13 sequentially. In addition, one end of the heat storage coil 35 is connected to the refrigerant pipe 16 via the connection pipe 39 between the electric expansion valve 38 and the first electromagnetic valve 41. The other end of the heat storage coil 35 is connected to the refrigerant pipe 17 of the ice heat storage unit 12 via the connection pipe 40, and the second electromagnetic valve 42 is disposed in the connection pipe 40. Further, one end of a connection pipe 44 including a third electromagnetic valve 43 is connected to the refrigerant pipe 16 between the receiver tank 37 and the electric expansion valve 38. The other end of the connection pipe 44 is connected between the second electromagnetic valve 42 and the heat storage coil 35 in the connection pipe 40.

  The ice heat storage tank 36 is filled with water as a secondary medium, and the heat storage coil 35 is disposed in a submerged state. During the ice making operation of the air conditioner 10, the liquid refrigerant as the primary medium from the heat source side heat exchanger 21 flows into the heat storage coil 35 and evaporates, whereby ice adheres to the outer periphery of the heat storage coil 35. It is formed and cold energy is stored in this ice. During the ice-free cooling operation of the air conditioner 10, the liquid refrigerant from the heat source side heat exchanger 21 flows into the heat storage coil 35 in a full state, and this liquid refrigerant melts the ice adhering to the outer periphery of the heat storage coil 35. The ice becomes cold due to the cold heat.

  The heat source side unit 11 is provided with a control device 45 as control means for performing operation control of the entire air conditioner 10. Here, the control device 45 may be provided in the ice heat storage unit 12 or the use side unit 13, or provided separately from these units 11, 12, and 13 (for example, a remote controller). Also good.

  Next, the ice making operation of the air conditioner 10 will be described in detail.

  The ice making operation of the air conditioner 10 shown in FIG. 1 is performed, for example, in the time period from 10:00 at night to 8:00 in the next morning by using the refrigerant from the heat source side heat exchanger 21 in the heat source side unit 11 as ice storage in the ice heat storage unit 12. In this operation, the ice is supplied to the heat storage coil 35 in the tank 36 to produce ice in the ice heat storage tank 36.

  In this case, in the ice heat storage unit 12, the first electromagnetic valve 41 and the third electromagnetic valve 43 are closed, and the electric expansion valve 38 and the second electromagnetic valve 42 are opened. Further, the electric expansion valve 26 of the use side unit 13 is closed. In this state, the gas refrigerant discharged from the compressor 18 is condensed in the heat source side heat exchanger 21 and decompressed through the electric expansion valve 22 and the electric expansion valve 38 of the ice heat storage unit 12. Into the heat storage coil 35. The refrigerant flowing into the heat storage coil 35 is evaporated, and ice is formed on the outer periphery of the heat storage coil 35. Thereafter, the gas refrigerant in the heat storage coil 35 reaches the four-way valve 20 through the connection pipe 40, the second electromagnetic valve 42 and the refrigerant pipe 17, and is returned to the compressor 18 through the accumulator 19. Ice is formed in the ice heat storage tank 36 by this ice making operation, and the cold heat of this ice is used for the ice-freezing cooling operation.

  Next, the ice-free cooling operation of the air conditioner 10 will be described in detail.

  In the ice-freezing and cooling operation of the air conditioner 10, for example, during the daytime when the temperature rises, the liquid refrigerant from the heat source side heat exchanger 21 in the heat source side unit 11 is transferred to the ice heat storage tank 36 in the ice heat storage unit 12. The heat storage coil 35 is supplied with a supercooled state, and this supercooled liquid refrigerant is supplied to the use side heat exchanger 25 of the use side unit 13 for implementation.

  In this case, in the ice heat storage unit 12, the second electromagnetic valve 42 is closed, the first electromagnetic valve 41 and the third electromagnetic valve 43 are opened, and the opening degree of the electric expansion valve 38 is adjusted. Moreover, the opening degree of the electric expansion valve 26 of the use side unit 13 is adjusted.

  The gas refrigerant discharged from the compressor 18 is condensed in the heat source side heat exchanger 21, and the ice heat storage through the electric expansion valve 22, the refrigerant pipe 16, the connection pipe 44, and the third electromagnetic valve 43 of the ice heat storage unit 12. It flows into the heat storage coil 35 in the tank 36. The liquid refrigerant that has flowed into the heat storage coil 35 flows in the heat storage coil 35 in a full state, defrosts the ice adhering to the outer periphery of the heat storage coil 35, and becomes supercooled by the cold heat stored in the ice. Thereafter, the supercooled liquid refrigerant in the heat storage coil 35 passes through the connection pipe 39, the first electromagnetic valve 41 and the refrigerant pipe 16, and the refrigerant pipe 15 </ b> A and the electric expansion valve 26 of the usage side unit 13. 25, and the use side heat exchanger 25 evaporates to cool the room. Thereafter, the gas refrigerant passes through the refrigerant pipe 30 and the refrigerant pipe 15B, passes through the refrigerant pipe 17 of the ice heat storage unit 12, passes through the four-way valve 20 and the accumulator 19, and then returns to the compressor 18.

  Therefore, during the ice-freezing cooling operation, the cold heat of the ice in the ice heat storage tank 36 is used in the ice making operation described above, and the liquid refrigerant is supercooled in the heat storage coil 35 of the ice heat storage tank 36, and the use side heat exchanger Therefore, the efficiency of the cooling operation in the use side heat exchanger 25 can be improved.

  Next, the normal cooling operation of the air conditioner 10 will be described.

  The normal cooling operation in the air conditioner 10 is a cooling operation performed without using the cold energy stored in the ice in the ice heat storage tank 36 in the ice heat storage unit 12, and the second electromagnetic valve 42 and the third electromagnetic valve 43. Is closed, and the electric expansion valve 38 and the first electromagnetic valve 41 are opened. Further, the electric expansion valve 26 in the use side unit 13 is opened.

  In this state, when the compressor 18 of the heat source side unit 11 is started, the gas refrigerant discharged from the compressor 18 is condensed in the heat source side heat exchanger 21, and the electric expansion valve 22 and the ice heat storage unit 12 are condensed. The refrigerant pipe 16, the electric expansion valve 38, and the first electromagnetic valve 41 pass through the refrigerant pipe 15 </ b> A and the electric expansion valve 26 of the usage side unit 13 and flow into the usage side heat exchanger 25. After evaporating and cooling the room, the refrigerant passes through the refrigerant pipe 15B, passes through the refrigerant pipe 17 of the ice heat storage unit 12, passes through the four-way valve 20 and the accumulator 19, and then returns to the compressor 18.

  In the present embodiment, a temperature sensor 47 is provided in the use side heat exchanger 25 as an evaporation temperature detecting means for detecting the refrigerant evaporation temperature of the use side heat exchanger 25 when functioning as an evaporator. In addition, a temperature sensor 48 is provided in the suction grill 73, which will be described later, as indoor temperature detection means for detecting the inside air temperature. Further, a temperature sensor 49 is provided in the vicinity of an air inlet (not shown) of the heat source unit 11 as an outside air temperature detecting means for detecting the outside air temperature.

  Next, the ventilation device 50 of the use side unit 13 will be described.

  The ventilator 50 includes an outside air introduction unit 51 that guides outdoor air (outside air) to the room, and an inside air discharge unit 52 that exhausts room air (inside air) to the outside of the room. The ventilator 50 includes a total heat exchange element 53. The total heat exchange element 53 is formed by placing a flat sheet on a meander-folded folded paper, and placing the folded paper on the folded paper with the folding direction changed on the folded paper. Bending paper and flat paper are laminated in order. The total heat exchange element 53 is disposed so as to straddle the outside air introduction air passage 54 of the outside air introduction portion 51 and the inside air discharge air passage 55 of the inside air discharge portion 52, and the outside air and the inside air discharge air passage passing through the outside air introduction air passage 54. A function of exchanging heat with the inside air passing through 55 is provided.

  In other words, when the ventilator 50 performs the ventilation operation while the air conditioner 10 is performing the cooling operation, the total heat exchange element 53 exchanges heat between the warm outside air and the cold indoor exhaust air to remove the outside air. It is cooled and air is supplied indoors. When the ventilator 50 performs the ventilation operation while the air conditioner 10 performs the heating operation, the total heat exchange element 53 heats the outside air by exchanging heat between the cold outside air and the warm indoor exhaust. , Indoor air supply. Thereby, it can suppress that air-conditioning property falls by ventilation operation.

  The outside air introduction unit 51 includes an air supply fan 56 and an outside air filter 57 on the outside air inlet side of the total heat exchange element 53 in the outside air introduction air passage 54, and on the outside air outlet side of the total heat exchange element 53 in the outside air introduction air passage 54. A humidifier 58 is provided. With this configuration, the outside air introduced from the air supply duct 59 passes through the air supply fan 56 and then reaches the total heat exchange element 53 via the outside air filter 57. After heat exchange with the inside air, the humidifier 58 is Then, the air direction is adjusted by the blowout louver 66 (FIG. 3) and blown into the room. A humidifying tank 58A is connected to the humidifier 58, and humidified water from the humidifying tank 58A is sequentially supplied to the humidifier 58.

  The inside air discharge unit 52 includes an air path changing damper 60 and an exhaust fan 61 on the inside air outlet side of the total heat exchange element 53 in the inside air discharge air path 55. With this configuration, the inside air from the conditioned room reaches the total heat exchange element 53 via the suction grill 64 (FIG. 3), and after the heat exchange with the outside air, the air path change damper 60 and the exhaust fan 61 are Then, the air is exhausted outside through the exhaust duct 62.

  The air path change damper 60 can block the air path, and when the air path change damper 60 operates, the inside air outlet side of the total heat exchange element 53 is blocked, and the inside air bypasses the total heat exchange element 53 and is normally The exhaust fan 61 is reached through the ventilation air passage 63 and is exhausted outside through the exhaust duct 62.

  In the present embodiment, as shown in FIG. 2, the use side unit 13 of the air conditioner 10 is connected to and integrated with an air conditioner body 13A suspended from the ceiling and a rear portion of the air conditioner body 13A. And a ventilator main body 50A for adjusting the outside air temperature.

  As shown in FIG. 3, the use side heat exchanger 25, the use side blower 27, the drain pan 71, and the electrical box 72 are disposed inside the air conditioner main body 13 </ b> A. A filter 73A is arranged. In this air conditioner body 13A, an inside air circulation air passage 46 is formed which guides the inside air to the use side heat exchanger 25 by the operation of the use side blower 27 and guides it into the room through the air outlet 74 of the air conditioner body 13A. ing. When the air conditioner main body 13A is operated, the inside air is sucked in via the suction grill 73, and this inside air reaches the use side heat exchanger 25 via the use side blower 27, and after heat exchange with the refrigerant here. The air is blown into the conditioned room through the blowout port 74.

  The above-described total heat exchange element 53, the air supply fan 56, the exhaust fan 61, and the like are disposed inside the ventilation device main body 50A, and the filter 64A is disposed on the suction grill 64.

  In the present embodiment, the outlets 74 and 67 of the main bodies 13A and 50A are independently formed. The air outlets 74 and 67 are arranged close to each other, and the air blown out from the air outlet 74 of the air conditioner main body 13A and the air blown out from the air outlet 67 of the ventilator main body 50A are respectively connected to the air outlets 74 and 67. It is configured to be freely mixed at the exit.

  As shown in FIG. 3, the height H1 of the air conditioner main body 13A is formed lower than the height H2 of the ventilation apparatus main body 50A. A 50 A outside air introduction air passage 54B is formed. The outside air introduction air passage 54B is an air passage that guides the outside air heat-exchanged by the total heat exchange element 53 into the room through the outlet 67 of the ventilator main body 50A. The total height obtained by adding the height of the outside air introduction air passage 54B and the height H1 of the air conditioner main body 13A is substantially equal to the height H2 of the ventilator main body 50A.

  At the front end portion of the outside air introduction air passage 54B, there is provided a blowout port 67 having the same width as that of the outside air introduction air passage 54B. The full width of this blowout port 67 is as shown in FIG. It is formed so as to be equal to the entire width of the air outlet 74. In addition, although illustration is abbreviate | omitted, the utilization side heat exchanger 25 is formed so that it may become substantially equal to the full width of the blower outlet 74 of 13 A of air conditioner main bodies.

  As shown in FIG. 3, the ventilation device main body 50 </ b> A suspended from the ceiling has a housing portion R <b> 1 for the total heat exchange element 53 and a housing portion R <b> 2 for the air supply fan 56 and the exhaust fan 61. The main body 50A is provided side by side in the depth direction.

  As shown in FIG. 4, the air supply fan 56 and the exhaust fan 61 are collectively stored in an air passage forming body 202 made of foamed resin having a width W, a length L, and a height H (FIG. 3). The air passage forming body 202 has a plurality of lengths W2 and heights H3 (FIG. 3) fixed at intervals in the length L direction with both ends regulated by the regulating member 205. It is mounted on the mounting plate 203. The plurality of mounting plates 203 also serve as partition plates that partition the intake passage and the exhaust passage in the supply fan 56 and the exhaust fan 61. Further, in order to regulate the lateral position of the air passage forming body 202, as shown in FIG. 3, the total heat exchange element housing portion R1 has a foamed resin having a width W1, a length L1 (FIG. 4), and a height H2. A made element casing (not shown) is fitted, and the total heat exchange element 53 is held in the casing.

  On the surface 202A of the air passage forming body 202 facing the total heat exchange element 53, an opening 601 corresponding to the outlet of the air supply fan 56 and the opening 601 are connected to all the air blown from the air supply fan 56. And an air guide portion 602 that leads to the entire width of the heat exchange element 53.

  In the present embodiment, since the total heat exchange element 53 is disposed to face the opening 601 and the air guide portion 602 formed in the air passage forming body 202, a considerable amount of air blown by the air supply fan 56 is obtained. Then, after passing through the opening 601, the air is guided to the air guide portion 602, and is distributed almost evenly over the entire width of the total heat exchange element 53 through the air guide portion 602.

  By the way, when the indoor heat load is low during the cooling operation (normal cooling operation or ice-free cooling operation), the evaporation temperature of the refrigerant in the use side heat exchanger 25 may be lowered. As described above, when the evaporation temperature of the refrigerant is lowered, the condensed water condensed on the use side heat exchanger 25 is frozen or ice is left in the ice heat storage tank 36.

  In the present embodiment, as shown in FIG. 3, a damper 68 is provided between the outside air introduction air passage 54 </ b> B and the inside air circulation air passage 46. The damper 68 is provided to guide outside air to the use side heat exchanger 25. Specifically, an opening is provided at a position facing the use-side heat exchanger 25 in the upper part of the air conditioner body 13A, and a damper 68 is provided in the opening so as to open to the outside of the air conditioner body 13A. That is, the damper 68 is provided in the vicinity of the use side heat exchanger 25. When the damper 68 is in the closed state as shown in FIG. 3, the damper 68 blocks the opening, and the outside air heat exchanged by the total heat exchange element 53 is blown out into the room through the blowout port 67. 3, when the damper 68 is open, the air outlet 67 side of the ventilator main body 50A is closed by the damper 68, and the outside air heat exchanged by the total heat exchange element 53 is The air-conditioner main body 13 </ b> A is guided through the opening of the air-conditioner main body 13 </ b> A to the use-side heat exchanger 25 and blown out into the room through the outlet 74.

  As shown in FIG. 4, the damper 68 is formed to have a width substantially the same as the width of the outside air introduction air passage 54B. That is, the damper 68 is formed to extend over the width direction of the use side heat exchanger 25. As a result, when the damper 68 is opened, the air outlet 67 is closed over substantially the entire region, and most of the outside air heat exchanged by the total heat exchange element 53 is guided to the use side heat exchanger 25. That is, the air path can be easily changed simply by opening the damper 68. Furthermore, outside air can be guided substantially uniformly over the width direction of the use side heat exchanger 25, and the evaporation temperature of the refrigerant in the use side heat exchanger 25 can be increased more effectively.

  The opening / closing control of the damper 68 is performed by the control device 45. Hereinafter, the control operation of the damper 68 by the control device 45 will be described with reference to the control flowchart shown in FIG.

  First, the control device 45 determines whether or not the air conditioner 10 is set to a cooling operation (for example, a normal cooling operation or an ice-free cooling operation) (step S1).

  When the cooling operation is set (step S1; Yes), the control device 45 determines whether or not the outside air temperature is higher than the suction temperature (inside air temperature) (step S2). That is, the control device 45 determines whether or not the temperature detected by the temperature sensor 49 is higher than the temperature detected by the temperature sensor 48.

  Next, when the outside air temperature is higher than the suction temperature (inside air temperature) (step S2; Yes), the control device 45 sets the first predetermined temperature at which the evaporation temperature of the refrigerant in the use side heat exchanger 25 is predetermined. It is determined whether it is below (step S3). Here, the first predetermined temperature is set to such a temperature that the condensed water of the use side heat exchanger 25 is frozen.

  When the evaporating temperature of the refrigerant in the usage-side heat exchanger 25 is lower than a predetermined first predetermined temperature (step S3; Yes), the control device 45 performs control to open the damper 68 (step S4). By opening the damper 68 in this way, the outside air heat-exchanged by the total heat exchange element 53 is guided to the use side heat exchanger 25.

  Here, since the outside air temperature is higher than the inside air temperature, the outside air having a temperature higher than the room temperature is guided to the use side heat exchanger 25. Therefore, the refrigerant evaporation temperature of the use side heat exchanger 25 is increased.

  Next, the control device 45 determines whether or not the evaporation temperature of the use side heat exchanger 25 has reached the second predetermined temperature (step S5), and the evaporation temperature is the second. If the predetermined temperature is not reached (step S5; No), the damper 68 is kept open until the evaporation temperature reaches the second predetermined temperature. Here, the second predetermined temperature is set to be higher than the first predetermined temperature. That is, this is to avoid the operation of frequently opening and closing the damper 68 near the first predetermined temperature. In addition, it cannot be overemphasized that this 2nd predetermined temperature is set in the range in which the driving | operation of the air conditioning apparatus 10 operate | moves stably.

  When the evaporation temperature of the use side heat exchanger 25 reaches the second predetermined temperature (step S5; Yes), the control device 45 closes the damper 68 (step S6). When the air conditioner 10 is set to an operation other than the cooling operation (for example, heating operation) (step S1; No), or when the outside air temperature is lower than the intake temperature (inside air temperature) (step S2; No). The damper 68 is in a closed state.

  Here, when the outside air temperature is lower than the suction temperature (inside air temperature) and the evaporation temperature of the refrigerant in the use side heat exchanger 25 is lower than the first predetermined temperature (that is, the use side heat exchanger 25 is When freezing), the compressor 18 is stopped, the various valves 22, 26, 38, 41, 42, 43, etc. in the refrigerant circuit are opened to equalize the pressure in the refrigerant circuit and to operate the use side blower 27. Perform normal anti-freezing operation. Then, after a predetermined time (for example, 10 minutes) has elapsed since the compressor 18 was stopped, the temperature of the use-side heat exchanger 25 is detected, and if this temperature is equal to or higher than the second predetermined temperature, the compressor 18 Start up and perform cooling operation.

  As described above, according to the present embodiment, the damper 68 is opened when the evaporation temperature of the refrigerant in the usage-side heat exchanger 25 is lower than the first predetermined temperature during the cooling operation, so the usage-side heat exchanger The outside air through the total heat exchange element 53 is guided to 25, and freezing of the use side heat exchanger 25 can be avoided by simply opening the damper 68 without performing the above-described normal freeze prevention operation.

  In addition, since the number of times the compressor 18 is repeatedly started and stopped and the various valves 22, 26, 38, 41, 42, 43 and the like are operated decreases, the compressor 18 and the various valves 22, 26, 38, 41, 42, The durability of 43 and the like is improved. Furthermore, since it is not necessary to stop the compressor 18 in order to prevent the use side heat exchanger 25 from freezing, the air conditioner 10 can be stably operated without stopping the cooling operation.

  Further, since the outside air warmer than the inside air is guided to the use-side heat exchanger 25, the evaporation temperature of the refrigerant in the use-side heat exchanger 25 increases and the refrigerant can be sufficiently evaporated. Backing can be suppressed, and the air conditioner 10 can be operated stably.

  Here, in the cooling operation, during the ice-breaking cooling operation, for example, when performing the ice-breaking control for melting all the ice in the ice heat storage tank 36 within a predetermined time, the damper 68 is opened, and the user side The outside air may be guided to the heat exchanger 25. That is, if the ice making operation is performed with ice remaining in the ice heat storage tank 36, an ice bridge may be formed between the heat storage coils 35, and the heat storage coil 35 may be deformed. Thus, ice remains in the ice heat storage tank 36 when the indoor heat load is low and the evaporation temperature of the refrigerant in the use side heat exchanger 25 is low.

  When performing the ice melting control in the ice melting cooling operation, the control device 45 controls the damper 68 as in FIG. Here, the first predetermined temperature may be set to a temperature necessary to defrost the ice in the ice heat storage tank 36 in a predetermined time. That is, the first predetermined temperature is set to a value corresponding to each of the normal cooling operation and the ice-free cooling operation. These values are stored in advance in a storage device such as a ROM (not shown) (storage means).

  As described above, by opening the damper 68, the outside air is guided to the use side heat exchanger 25 and the evaporation temperature of the use side heat exchanger 25 is increased. Therefore, the temperature of the refrigerant flowing in the heat storage coil 35 is increased, and the ice heat storage tank The ice melting speed of the ice in 36 will increase. Therefore, it is possible to shorten the time for defrosting the ice in the ice heat storage tank 36, and to prevent bridging of ice. Therefore, deformation of the heat storage coil 35 due to ice can be suppressed, and the air conditioner 10 can be stably operated.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this.

  For example, in the above embodiment, the case where the ice heat storage unit 12 is provided has been described. However, the present invention is not limited to this, and the present invention can also be applied to an air conditioner that does not include the ice heat storage unit 12.

It is a pipe line figure showing an air harmony device provided with an ice heat storage unit to which one embodiment of an air harmony device concerning the present invention was applied. It is the perspective view which looked at the utilization side unit of an air conditioning apparatus from the bottom. It is sectional drawing which shows the utilization side unit of an air conditioning apparatus. It is a top view of the utilization side unit of an air conditioning apparatus. It is a control flowchart which shows control of the damper by a control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus 13A Air conditioner main body 18 Compressor 21 Heat source side heat exchanger 25 Use side heat exchanger 35 Thermal storage coil 36 Ice thermal storage tank 45 Control apparatus (control means)
46 Inside air circulation air passage 50A Ventilator body 53 Total heat exchange element 54B Outside air introduction air passage 67 Air outlet 68 Damper 74 Air outlet

Claims (3)

An air conditioner main body having a use side heat exchanger and a ventilator main body having a total heat exchange element are integrated, each outlet of each main body is made independent, and the inside air is led to the use side heat exchanger and the air It has an internal air circulation air passage that leads to the room through the blowout port of the conditioner body, and an outside air introduction air passage that guides the outside air heat-exchanged by the total heat exchange element into the room through the blowout port of the ventilator body. ,
Arranging the outside air introduction air passage adjacent to the upper part of the inside air circulation air passage,
The upper part of the air conditioner body that partitions the outside air introduction air passage and the inside air circulation air passage is opposed to the use heat exchanger downstream of the use side blower and in the vicinity of the use heat exchanger. A damper,
An air conditioner comprising control means for opening the damper when the evaporation temperature of the refrigerant in the use side heat exchanger is lower than a predetermined temperature. In the air conditioning apparatus according to claim 1,
The air conditioner characterized in that the damper closes the outlet of the ventilator body when the damper is open. In the air conditioning apparatus according to claim 1 or claim 2,
The said air damper is formed so that the said damper may extend over the width direction of the said utilization side heat exchanger.

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