JP2015183898A - air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time during which heating cannot be performed due to a defrosting operation and to improve comfort in a room by enabling shortening of defrosting operation time.SOLUTION: An air conditioner includes: an outdoor unit 1 (1a, 1b); and a plurality of indoor units 2 (2a-2d). Each of the plurality of indoor units includes: human detection sensors 7a-7d; and a control device for controlling a defrosting operation of the outdoor unit. The control device controls in such a manner that, when performing the defrosting operation of the outdoor unit, a fan air blowing amount of the indoor units 2b, 2d in which absence is detected by the human detection sensors is increased, and as for the indoor units 2a, 2c which have detected a person, the defrosting operation is executed by stopping fan air blowing or by blowing only a small amount of air.

Description

  The present invention relates to an air conditioner having an outdoor unit and a plurality of indoor units connected to the outdoor unit, and particularly relates to an air conditioner having a defrosting operation function of a heat exchanger of the outdoor unit.

  In an air conditioner, if the outside air temperature falls to 0 ° C. or less during heating operation, frost forms on the surface of the heat exchanger (outdoor heat exchanger) of the outdoor unit, and the ventilation resistance of the heat exchanger increases. There is a problem that the air flow is reduced and the heat exchange between the air and the refrigerant is difficult to be performed, so that the heating performance is lowered. Therefore, a defrosting operation is required periodically.

In the defrosting operation, generally, during the heating operation, the operation is temporarily switched to the cooling operation, the high-temperature refrigerant discharged from the compressor is circulated to the outdoor heat exchanger, the outdoor heat exchanger is warmed, and the heat exchange is performed. It is operated to melt and remove frost adhering to the vessel surface.
For this reason, since the heating operation is stopped during the defrosting operation, the blowing of warm air into the room is also stopped. The longer the stoppage time of the heating operation, the lower the indoor temperature and the comfort of the indoor environment.

  Therefore, conventionally, as disclosed in Japanese Patent Application Laid-Open No. 11-118380 (Patent Document 1), as a heat exchanger having a fin structure that hardly forms frost, it is difficult for heating to stop due to frost, As described in Japanese Patent No. 250517 (Patent Document 2), various devices such as a defroster for a heat exchanger that can shorten the heating stop time using a heated brush have been made.

  Furthermore, as described in Japanese Patent Application Laid-Open No. 2012-202670 (Patent Document 3), in an air conditioner system including a plurality of outdoor units and one or a plurality of indoor units connected to each of the outdoor units, a user In order to enable the defrosting control to be performed while satisfying the required capacity of the air conditioner system required by the air conditioner, it is determined whether or not each indoor unit is to perform the defrosting operation based on the operation capacity of each indoor unit and the required capacity. It has also been proposed that the execution determination is performed for each indoor unit so as not to give the user a feeling of cool air even if defrosting is started (comfort is not impaired).

JP-A-11-118380 JP 2009-250517 A JP 2012-202670 A

  In the thing described in the said patent document 1, the heat exchanger provided with the special fin structure is required, and in the thing described in the said patent document 2, the structure which scrapes off frost using a special brush is employ | adopted. There is a need to.

  With the thing of the said patent document 3, since shortening of the time concerning a defrost operation cannot be aimed at, the warm air is not blown out in the vicinity of the indoor unit which is in the defrost operation mode during the defrost operation time, Only the space will drop in temperature. For this reason, there exists a subject that a comfort fall cannot fully be suppressed.

  An object of the present invention is to obtain an air conditioner that can improve indoor comfort by reducing the time during which heating cannot be performed for the defrosting operation by reducing the defrosting operation time. .

  Another object of the present invention is to obtain an air conditioner capable of performing efficient cooling and heating simultaneous operation.

  In order to solve the above problems, a first feature of the present invention is an air conditioner including an outdoor unit and a plurality of indoor units, and a human sensor provided in each of the plurality of indoor units, And a control device that controls the defrosting operation of the outdoor unit, and the control device increases the fan blowing amount of the indoor unit that is detected by the human sensor when performing the defrosting operation of the outdoor unit. In addition, the indoor unit that has detected a person is controlled to stop the fan air flow or flow only a small amount so as to perform the defrosting operation.

  A second feature of the present invention is an air conditioner that includes an outdoor unit and a plurality of indoor units, and is configured to be able to set cooling and heating for each indoor unit so that cooling and heating can be operated simultaneously. A human sensor provided in each of the plurality of indoor units, the indoor unit detecting a person by the human sensor is operated in any mode of a heating mode or a cooling mode, and the human For indoor units that have been detected as absent by the sensation sensor, control is performed to operate in an operation mode opposite to the operation mode of the indoor unit in which a person is detected and to increase the fan air flow rate to perform heat recovery operation or heat dissipation operation. There is.

  According to the present invention having the first feature, since the defrosting operation time can be shortened, the air conditioning that can improve the comfort in the room by shortening the time that cannot be heated for the defrosting operation. There is an effect that the machine is obtained.

  According to the present invention having the second feature, an effect of obtaining an air conditioner capable of performing efficient cooling and heating simultaneous operation can be obtained.

It is a block diagram explaining Example 1 of the air conditioner of this invention. It is a flowchart explaining Example 2 of the air conditioner of this invention, and is a figure explaining the example of a process of a defrost start determination part. It is a flowchart explaining Example 3 of the air conditioner of this invention, and is a figure explaining the example of a process of an indoor temperature control part. It is a block diagram explaining Example 4 of the air conditioner of this invention. It is a block diagram explaining Example 5 of the air conditioner of this invention.

  Hereinafter, specific embodiments of the air conditioner of the present invention will be described with reference to the drawings. In each figure, the part which attached | subjected the same code | symbol has shown the part which is the same or it corresponds.

A first embodiment of an air conditioner according to the present invention will be described with reference to the block diagram shown in FIG.
In FIG. 1, 1 (1a, 1b) is an outdoor unit having an outdoor heat exchanger and an outdoor fan (none is shown), 2 (2a, 2b, 2c, 2d) is an indoor heat exchanger and an indoor fan (whichever Is also an indoor unit. In this embodiment, two outdoor units 1a and 1b and four indoor units are connected by refrigerant pipes 3 and 4 to constitute an air conditioner.

  Reference numeral 5 denotes a branch device that branches the refrigerant pipes 3 and 4 to distribute the refrigerant to the indoor units 2a to 2d, or collects the refrigerant from the indoor units 2a to 2d and returns the refrigerant to the indoor unit 1. .

Each said indoor unit 2a-2d is provided in each room 6 (6a, 6b, 6c, 6d), or is provided in each area which should be air-conditioned. 7 (7a, 7b, 7c, 7d) is a human sensor provided in each of the indoor units 2a to 2d. The human sensor 7 is a person 8 in each of the rooms 6a to 6d. You can detect if you are absent.
The air conditioner of the present embodiment configured as described above can perform heating operation, cooling operation, and defrosting operation.

  During the heating operation, the outdoor heat exchanger of the outdoor unit 1 serves as an evaporator, the indoor heat exchanger of the indoor unit 2 serves as a condenser, and hot air is supplied to the rooms (indoors) 6a to 6d. The Further, since the outdoor heat exchanger 1 is an evaporator, when the heat transfer surface becomes zero degrees or less, moisture in the air condenses and freezes on the heat transfer surface, and frost is generated. When such frost adheres to the heat transfer surface and its thickness (frost formation amount) increases, the air flow path in the outdoor heat exchanger becomes narrower, and the amount of air flow flowing through the outdoor heat exchanger becomes smaller. The heat transfer from the air to the refrigerant is hindered. For this reason, the heat exchange efficiency of an outdoor heat exchanger falls and the performance as an air conditioner falls.

  Therefore, the air conditioner of the present embodiment has a defrosting operation function for removing frost adhering to the outdoor heat exchanger, and is configured to execute the defrosting operation when the amount of frost formation increases. . For example, when the heating operation has elapsed for a certain time, it is determined that the amount of frost on the outdoor heat exchanger has increased, the heating operation is stopped, and the defrosting operation is started. When the defrosting operation is started, the flow of the refrigerant is reversed so that the outdoor heat exchanger acts as a condenser and the indoor heat exchanger acts as an evaporator. For this reason, the indoor units 2 cannot supply hot air to the rooms 6a to 6d, and therefore the indoor fan is stopped or operated in a light wind mode (operation in which only a small amount flows).

  Furthermore, in this embodiment, since the indoor units 2a to 2d are provided with human sensors 7a to 7d, respectively, whether or not a person is present in each of the rooms 6a to 6d by these human sensors 7a to 7d. Detect if you are absent. In the example of FIG. 1, a person 8 is present in the rooms 6a and 6c, and a person is absent in the rooms 6b and 6d. Therefore, in the present embodiment, the indoor fans of the indoor units 2a and 2c in the room where the person is present are stopped or operated in a breeze by the human sensor 7. Further, the rooms 6b and 6d, which are determined to be absent by the human sensor 7, are controlled so as to perform the heat recovery operation by increasing the air volume of the indoor fans of the indoor units 2b and 2d. An arrow 9 in FIG. 1 represents a state in which the heat recovery operation is performed by increasing the fan air volume with an air flow.

  In this way, by performing the heat recovery operation in the indoor units 2b and 2d in the absence of a person, the refrigerant flowing through the indoor heat exchangers of the indoor units 2b and 2d is recovered from the heat of the rooms 6b and 6d, The heat can be collected in the outdoor unit 1. In other words, during the defrosting operation, when the indoor fan is rotated and the heat recovery operation is performed, the indoor unit sucks the air in the room, the refrigerant flowing through the indoor heat exchanger absorbs heat from the air, and this heat is It can be used as the heat of fusion of frost adhering to the outdoor heat exchanger of the machine.

Therefore, according to the present embodiment, the indoor fan is actively recovered by increasing the number of rotations of the indoor fan and used as the heat of melting of frost adhering to the outdoor heat exchanger. Alternatively, the defrosting time can be greatly shortened as compared with the one that operates in a light wind. As a result, since the heating stop time can be significantly shortened, the air conditioner can significantly improve comfort by suppressing the temperature drop in the rooms 6a and 6c where people are present. You can get a chance.
In addition, since there is no person in the rooms 6b and 6d where the indoor units 2b and 2d that perform the heat recovery operation are present, even if the heat recovery operation is performed, no unpleasant feeling is given to the person.
As described above, in the present embodiment, during the defrosting operation, the heat recovery operation is performed by increasing the indoor fan air volume of the indoor unit in the room where no person is present. Heat can be efficiently recovered and used as a defrosting heat source for outdoor units. Therefore, since the defrosting operation can be completed in a short time, the heating operation stop time is shortened, and the effect of improving the indoor comfort can be obtained.

  In addition, control of the defrost operation mentioned above can be performed by the control apparatus (not shown) which controls an air conditioner. The control device is connected to devices constituting the air conditioner, a temperature sensor, a pressure sensor, the human sensor, and the like through signal lines, and operates the air conditioner in addition to the defrosting operation control. Various controls can be performed.

  In the above-described embodiment, the explanation has been made with the example in which the number of outdoor units 1 is two and the number of indoor units 2 is four. However, the number of outdoor units may be one or three or more, and the number of indoor units 2 is limited to four. Instead, the present embodiment can be similarly applied to a case where two or more arbitrary numbers are connected.

  A second embodiment of the air conditioner of the present invention will be described with reference to the flowchart of FIG. The flowchart shown in FIG. 2 is a diagram illustrating an example of processing of the defrosting start determination unit. In addition, since the structure as an air conditioner of a present Example is the same as that of what is shown in FIG. 1, those description is abbreviate | omitted and about the process of the defrost start determination part which is the characteristics of this Example 2, by FIG. explain.

  In the second embodiment, defrosting operation control is performed according to the flowchart shown in FIG. In the first embodiment described above, it is determined whether or not the outdoor heat exchanger has the amount of frost necessary for the defrosting operation, and the defrosting operation is started, but in the second embodiment, the outdoor heat exchange is performed. Even if the frost until the defrosting operation is not attached to the device, the defrosting operation is controlled to start when certain conditions are satisfied.

Hereinafter, a specific description will be given with reference to FIG.
First, when the determination of whether or not the defrosting operation is necessary is started in step S1, the process proceeds to step S2 to determine whether or not frost adheres to the outdoor heat exchanger. In this determination, for example, whether or not frosting is progressing can be determined based on whether or not the evaporation temperature is lower than a predetermined first predetermined temperature with respect to the outside air temperature. The first predetermined temperature is set as a temperature difference between the outside air temperature and the evaporation temperature at which it can be determined that frost has adhered to some extent but has not been adhered to an amount that requires defrosting operation.

In step S2, if there is no frost formation or little frost formation (in the case of NO), the determination in step S2 is repeated again after the control time has elapsed.
If it is determined in step S2 that frost formation is in progress (in the case of YES), the process proceeds to step S3, where it is determined whether frost formation has progressed to the amount to be defrosted. . In this determination, for example, whether or not frosting is necessary can be determined based on whether or not the evaporation temperature is lower than a predetermined second predetermined temperature with respect to the outside air temperature. This second predetermined temperature may be set as a temperature difference between the outside air temperature and the evaporation temperature at which it can be determined that frosting has progressed until the defrosting operation is required.

  If it is determined in step S3 that the defrosting operation is necessary (in the case of YES), the process moves to step S4, the defrosting operation is performed, and the defrosting operation is completed. The negative determination is terminated (step S5).

  If it is determined in step S3 that frosting is not performed to the extent that the defrosting operation is necessary (in the case of NO), the process proceeds to step S6 and based on signals from the human sensors 7a to 7d. , It is determined whether there is a room in which a person is absent (the presence sensor detects the absence). In this step S6, when there are one or more rooms where no person is present (in the case of YES), even if it is not frosting as much as defrosting operation is necessary, the process proceeds to step S4 and the removal is performed. Perform frost operation.

In step S6, when there is no room where no person is present (in the case of NO), the process proceeds to step S5, and the defrosting operation necessity determination is terminated.
After the step S5 is completed, the same operation is repeated from the step S1 again after a predetermined time has elapsed.

In the present embodiment, if the frost is so strong that the defrosting operation is necessary, the defrosting operation is started in the same manner as in the first embodiment. Even when the frost is not progressing, the defrosting operation is started when there is a room in which the presence sensor detects the absence. Therefore, since the defrosting operation is performed more frequently at the timing when the person is absent during the heating operation, the defrosting operation can be completed in a short time because the defrosting can be started while there is little frost. The effect is not impaired.
Thus, by performing defrosting while performing heat recovery operation in the absence of a person, the heating operation time can be ensured for a longer time, and the effect of improving indoor comfort can be obtained.
In addition, when the defrosting operation is started at the timing when frosting has progressed, when all the rooms are present at the start of the defrosting operation and there are no absent rooms, the heat recovery operation described above cannot be performed. , Defrosting time will be longer. On the other hand, in the second embodiment, since the defrosting operation is performed more frequently at the timing when the person is absent, the start of the defrosting operation can be delayed to reduce the deterioration of comfort.

  A third embodiment of the air conditioner of the present invention will be described with reference to the flowchart of FIG. The flowchart shown in FIG. 3 is a diagram illustrating an example of processing of the room temperature control unit. In addition, since the structure as an air conditioner of this Example 3 is the same as that of what is shown in FIG. 1, those description is abbreviate | omitted and about the process of the indoor temperature control part which is the characteristics of this Example 3 by FIG. explain.

In the third embodiment, room temperature control is performed during the defrosting operation along the flowchart shown in FIG.
In this embodiment, when the defrosting operation is started, the control device that controls the air conditioner is configured to also start the indoor temperature control shown in FIG.

  First, when the indoor temperature control is started in step S10, the process proceeds to step S11, where there is a room where no person is present during the defrosting operation, and whether or not the above-described heat recovery operation is performed, that is, heat The presence / absence of an indoor unit performing a recovery operation is determined. In this step S11, when there is an indoor unit that is performing the heat recovery operation (in the case of YES), the process proceeds to step S12, and whether or not the blowing temperature of the indoor unit that is performing the heat recovery operation is equal to or lower than a predetermined temperature. Determine whether. This predetermined temperature is set to a temperature lower than the indoor set temperature at which the indoor unit is provided and low enough not to give a feeling of unpleasantness when the person enters the room. Alternatively, it is preferable to set the temperature so that it does not take an abnormally long time to raise the temperature of the room when the heating operation of the room is started.

  Instead of the blowout temperature of the indoor unit, the suction temperature of the indoor unit or the room temperature (room temperature) may be used for comparison with the predetermined temperature. In the present invention, these temperatures compared with the predetermined temperature are collectively referred to as temperatures in the indoor unit.

  If the blowout temperature of the indoor unit during the heat recovery operation is not lower than the predetermined temperature determined in step S12 (NO), the control time is continued while continuing the heat recovery operation. The determination in step S12 is repeated every time.

  If it is determined in step S12 that the blowout temperature of the indoor unit during the heat recovery operation is equal to or lower than a predetermined temperature (in the case of YES), the process proceeds to step S13 and the indoor fan of the indoor unit is moved. To stop the heat recovery operation. By controlling in this way, the room can be extremely cooled for the heat recovery operation, and it is possible to reduce the discomfort of being extremely cold when a person enters the room.

  In other words, in this embodiment, when a person enters the room where the person is absent, the heat recovery operation is performed under the condition that the room is not overcooled, so that the person feels abnormally uncomfortable at the time of re-entry. It can be avoided. Thus, there is an effect that it is possible to suppress the comfort from being impaired by performing the heat recovery operation under an appropriate condition.

After the indoor fan is stopped in step S13, the indoor temperature control ends (step S14). In step S11, when there is no indoor unit that is performing the heat recovery operation (in the case of NO), the process proceeds to step S14, and the indoor temperature control ends.
In the indoor temperature control shown in FIG. 3, when there are a plurality of indoor units that are performing the heat recovery operation, the indoor temperature control shown in FIG. 3 is performed for each indoor unit.

In the first to third embodiments described above, an example of an air conditioner in which all the indoor units can be operated only by cooling or heating has been described, but the present invention can set the cooling operation and heating operation by each indoor unit. The same can be applied to an air conditioner capable of simultaneous cooling and heating.
In the fourth embodiment, the case where the present invention is applied to an air conditioner capable of simultaneous cooling and heating will be described with reference to FIG. FIG. 4 is a configuration diagram showing an air conditioner capable of simultaneous cooling and heating. In this embodiment, the outdoor unit 1 includes two units (1a and 1b), and the indoor unit 2 includes four units (2a to 2d). An example will be described.

  The outdoor unit 1 and the indoor unit 2 are connected by three refrigerant pipes, a high-pressure gas pipe 10, a low-pressure gas pipe 11, and a high-pressure liquid pipe 12. Also, high-pressure side opening / closing mechanisms 13a-13d are provided between the indoor units 2a-2d and the high-pressure gas pipe 10, respectively, and low-pressure side opening / closing mechanisms 14a-14d are provided between the low-pressure gas pipes 11, respectively. It has been. Further, indoor expansion valves 15a to 15d are provided between the indoor units 2a to 2d and the high-pressure liquid pipe 12, respectively. The indoor units 2a to 2d are provided with indoor heat exchangers 16a to 16d and indoor fans 17a to 17d, respectively.

As in the first embodiment, the indoor units 2a to 2d are also provided with human sensors 7a to 7d. An arrow 9 indicates an air flow generated when the indoor fan is driven.
Although the two outdoor units 1 are provided in this embodiment, the example shown in FIG. 4 shows a state in which the outdoor unit 1a is in the heating operation and the outdoor unit 1b is in the defrosting operation.

  In the outdoor units 1a and 1b, 20 denotes a compressor, 21 denotes an outdoor heat exchanger, 22 denotes an outdoor fan, 23 denotes an outdoor expansion valve, and 24 denotes a three-way valve. The three-way valve 24 may be used as a three-way valve by sealing one hole of the four-way valve. Moreover, after completion | finish of the defrost operation of the outdoor unit 1b, a defrost operation can be alternately performed by implementing the defrost operation of the outdoor unit 1a.

  FIG. 4 shows a situation where a person 8 is present in the rooms 6a, 6b, and 6c, the room 6d is absent, and the rooms 6a and 6c are performing heating operation, while the rooms 6b and 6d are excluded. The state which is implementing the frost operation is shown. In the rooms 6b and 6d during the defrosting operation, since the person 8 is present in the room 6b, the indoor fan 17b is stopped or the wind operation is stopped, and the heating operation is temporarily stopped. Shows the state where the rotation of the indoor fan 17d is increased and the heat recovery operation is performed.

  In the high-pressure side opening / closing mechanisms 13a to 13d and the low-pressure side opening / closing mechanisms 14a to 14d, the opening / closing mechanisms 13a, 14b, 13c, and 14d shown in white are in an open state and are shown in black. The opening / closing mechanisms 14a, 13b, 14c, and 13d are in a closed state.

  In the case of an air conditioner capable of simultaneous cooling and heating, the heat exchangers of the plurality of outdoor units 1a and 1b and the plurality of indoor units 2a to 2d can be operated as both an evaporator and a condenser. In addition, an operation in which an evaporator and a condenser are mixed in the plurality of outdoor units 1a and 1b, or an operation in which an evaporator and a condenser are mixed in the plurality of indoor units 2a to 2d can be performed. When all of the plurality of indoor units 2a to 2d are in the heating mode, each of the indoor heat exchangers 16a to 16d operates as a condenser and supplies hot air into the room. At this time, all the outdoor heat exchangers 21 are operating as evaporators.

  When the defrosting of the outdoor heat exchanger 21 becomes necessary after a lapse of time, the outdoor heat exchanger of the outdoor unit 1b, for example, which is part of the plurality of outdoor units 1a and 1b as shown in FIG. During the defrosting operation, the outdoor heat exchangers of the remaining outdoor units 1a can continue to operate in the heating mode by operating as an evaporator. For example, half of the four indoor units Operation can be continued in the heating mode. In the present embodiment, the human operation sensors 7a to 7d give priority to the indoor units 2a and 2c in the room where the person is present and continue the heating operation, and for the indoor unit 2d where the person is determined to be absent, Heating operation is stopped and heat recovery operation is performed to collect heat for defrosting.

That is, the indoor heat exchanger 16d of the indoor unit 2d flows the refrigerant so as to operate as an evaporator, and rotates the indoor fan 17d to exchange heat between the indoor air and the refrigerant to recover heat. As a result, the heat collected by the outdoor unit 1a during the heating operation and the indoor unit 2d during the heat recovery operation is used for heating in the indoor units 2a and 2c and for defrosting the outdoor unit 1b during defrosting. become.
According to the present embodiment, the heat source increases by the amount of the indoor unit 2d that is performing the heat recovery operation, so that the supply of heat to the outdoor heat exchanger that is desired to be defrosted is increased, and the defrosting time can be shortened. .

  Since the indoor unit 2b is also used for the defrosting operation, the flow of the refrigerant is the same as that of the indoor unit 2d. However, since a person is present, the indoor fan is rotated like the indoor unit 2d to recover heat. It does not drive | operate, It is set as the state which stopped the heating operation temporarily by making the indoor fan 17b stop or a light breeze operation similarly to normal defrost operation.

  In the fourth embodiment, two outdoor units 1 and four indoor units 2 are described. However, at least two indoor units may be used. It is preferable to have multiple outdoor units, but if there is an amount of heat recovered in an indoor unit that can perform heat recovery operation, and if there is an indoor unit that is cooling in winter, such as a computer room, the heat recovery amount is also combined, When the amount of heat used in the heating operation can be balanced, it may be possible to operate even with one outdoor unit. When the number of outdoor units is one, the operation of the three-way valve 24 causes the indoor unit to perform the heating operation to the outdoor heat exchanger 21 that performs a defrosting operation on a part of the high-temperature and high-pressure refrigerant from the compressor 20. To make it flow.

  Although the present embodiment 5 is also an example in the case where the present invention is applied to an air conditioner capable of simultaneous cooling and heating that can be set by each indoor unit for cooling operation and heating operation, in this embodiment, in the defrosting operation Even if it is not, by switching the indoor unit in the room where there is no person to the cooling operation and performing the heat recovery operation, it is used as a heat source for the indoor unit being heated.

  Embodiment 5 of the present invention will be described below with reference to FIG. FIG. 5 is a configuration diagram showing the fifth embodiment, and the portions denoted by the same reference numerals as those in FIGS. 1 and 4 are the same or corresponding portions, and the description of the same portions is omitted.

  In FIG. 5, 25a-25d are cooling / heating switching units, and these cooling / heating switching units 25a-25d are configured to include the high-pressure side opening / closing mechanisms 13a-13d and the low-pressure side opening / closing mechanisms 14a-14d shown in FIG. It is for making each indoor unit 2a-2d carry out heating operation, or setting it to cooling operation (or heat recovery operation).

  In the example shown in FIG. 5, the indoor units 2 a to 2 c in the rooms 6 a to 6 c where the person 8 is present are shown to be heated by the cooling / heating switching units 25 a to 25 c. Further, in the present embodiment, a state in which the heat recovery operation is performed by switching to the cooling operation mode by the cooling / heating switching unit 25d in the room 6d where no person is present is shown.

  For air conditioners that can operate both cooling and heating at the same time, heat recovery operation is performed in indoor units that detect the absence of people even when operating in modes other than defrosting mode, that is, in all-room heating mode. can do. Accordingly, by configuring the indoor unit 2d of the room 6d in which the person is absent to be automatically switched to the cooling mode, the heat recovery operation is performed, and the person is occupying the heat obtained here. Thus, it can be used as a heat source for the indoor units 2a to 2c that continue the heating operation.

  According to the present embodiment, not only the outdoor unit 1 but also the indoor unit 2d in a room in which no person is present can be used as a heat source for the heating operation. Therefore, the amount of heat recovered from the indoor unit 2d is from the outdoor unit 1. Reduces heat recovery. Thus, since the amount of heat recovered from the outdoor unit 1 can be reduced, the amount of heat transfer between the refrigerant flowing through the outdoor heat exchanger and the outdoor air is reduced, thereby causing frost formation accompanying heat transfer. Since the phenomenon slows down, the amount of frost formation can be reduced. Therefore, according to the present embodiment, the defrosting operation time can be shortened, the heating operation time of the rooms 6a to 6c in which the person is present can be lengthened, and the comfort is further improved. The effect that can be obtained.

  In the above-described fifth embodiment, the case where all the rooms in which the person is present is operated for heating has been described. About the indoor unit which detected absence by sensors 7a-7d, the room which carries out cooling operation by operating in the operation mode opposite to the operation mode of the indoor unit which detected a person, ie, heating mode, and increasing fan air flow rate. It is possible to perform the operation of dissipating the heat of the heat to the room where no person is present. Thereby, since the heat dissipation performance is improved, it is possible to improve the cooling capacity or reduce the power consumption.

  As described above, in the fifth embodiment, the indoor unit detected by the human sensor is operated in the operation mode opposite to the operation mode of the indoor unit that detects the person and the fan air flow rate is increased. By controlling the heat recovery operation or the heat radiation operation, the defrosting operation time can be shortened, the cooling capacity can be improved, or the power consumption can be reduced, so that efficient simultaneous cooling and heating operations can be performed.

  According to each embodiment of the present invention described above, when performing the defrosting operation of the outdoor unit, the fan blow amount of the indoor unit detected by the human sensor is increased, and the indoor unit detects the person. Since the fan blower is stopped or only a small amount is controlled to perform the defrosting operation, the defrosting operation time can be shortened, and the time during which the heater cannot be heated for the defrosting operation can be shortened to improve the indoor comfort. Can be improved.

  In addition, for indoor units that have been detected absent by a human sensor, they are operated in an operation mode opposite to the operation mode of the indoor unit in which a person has been detected, and the fan air flow rate is increased so that heat recovery operation or heat dissipation operation is performed. According to the embodiment that is controlled to the above, an effect of obtaining an air conditioner capable of performing efficient cooling and heating simultaneous operation can be obtained.

  In addition, this invention is not limited to the Example mentioned above, Various modifications are included. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Furthermore, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

1, 1a, 1b: outdoor unit, 2, 2a-2d: indoor unit,
3, 4: refrigerant piping, 5: branching device,
6a-6d: room,
7a-7d: Human sensor,
8: people, 9: airflow,
10: high pressure gas pipe, 11: low pressure gas pipe, 12: high pressure liquid pipe,
13a to 13d: high-pressure side opening / closing mechanism,
14a-14d: Low-pressure side opening / closing mechanism,
15a to 15d: indoor expansion valves,
16a to 16d: indoor heat exchangers,
17a-17d: Indoor fans.
20: Compressor, 22: Outdoor fan, 21: Outdoor heat exchanger,
23: outdoor expansion valve, 24: three-way valve,
25a-25d: Cooling / heating switching unit.

Claims (7)

An air conditioner comprising an outdoor unit and a plurality of indoor units,
A human sensor provided in each of the plurality of indoor units;
A control device for controlling the defrosting operation of the outdoor unit,
When the defrosting operation of the outdoor unit is performed, the control device increases the fan air flow rate of the indoor unit that has detected the absence by the human sensor, and stops the fan air flow or only a minute amount for the indoor unit that has detected a person. An air conditioner that is controlled so as to flow and perform a defrosting operation.   The air conditioner according to claim 1, wherein frosting on the heat exchanger of the outdoor unit is proceeding even when the defrosting operation start condition of the outdoor unit has not been reached. In addition, when there is at least one indoor unit whose absence is detected by the human sensor, a defrosting operation is performed.   The air conditioner according to claim 1 or 2, wherein when the indoor unit is used as a heat source for the defrosting operation by increasing the fan air flow rate for the defrosting operation, the air conditioner is used as a heat source for the defrosting operation. When the temperature in an indoor unit falls below a predetermined temperature, the air conditioner is controlled to stop or blow a small amount of fan air from the indoor unit.   It is an air conditioner of any one of Claims 1-3, Comprising: While setting the said outdoor unit in multiple units, it is set so that cooling and heating can be set for every indoor unit, and cooling and heating can be operated simultaneously. When performing the defrosting operation, the outdoor unit that performs the defrosting operation among the plurality of outdoor units is performed as the defrosting operation mode, and the other outdoor units are operated as the heating operation mode, An air conditioner characterized in that when there is an indoor unit that has been detected as being absent by a human sensor, control is performed to increase the fan air flow rate of the indoor unit to perform heat recovery operation.   5. The air conditioner according to claim 4, wherein the plurality of outdoor units are alternately switched to a defrosting operation mode and a heating operation mode to continuously operate the defrosting operation and the heating operation. An air conditioner characterized by The air conditioner according to any one of claims 1 to 3, wherein the cooling and heating can be set for each indoor unit so that the cooling and heating can be operated simultaneously.
The indoor unit detected by the human sensor is operated in the cooling mode and the fan blower amount is increased to perform the heat recovery operation, and the indoor unit detected the person is operated in the heating mode or the cooling operation mode. The air conditioner is characterized in that the outdoor fan is controlled so as to perform a heat recovery operation in which the indoor fan is stopped or operated in a breeze, and the outdoor unit is defrosted using the heat obtained by the heat recovery operation. An air conditioner comprising an outdoor unit and a plurality of indoor units, and configured to allow simultaneous operation of cooling and heating so that cooling and heating can be set for each indoor unit,
A human sensor provided in each of the plurality of indoor units,
About the indoor unit which detected the person by the human sensor, it operates in any mode of heating mode or cooling mode,
About the indoor unit which has detected absence by the human sensor, it is operated in the operation mode opposite to the operation mode of the indoor unit in which the person is detected, and the fan air flow rate is increased to perform the heat recovery operation or the heat radiation operation. An air conditioner characterized by controlling.

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