JPH05280819A - Multi-chamber type cooling or heating device - Google Patents

Abstract

PURPOSE:To improve stability in operation of a system and further improve efficiency of the operation of the system by a method wherein the system is provided with a refrigerant transporting device having a proper refrigerant transporting capability and a divided flow of the refrigerant into each of outdoor units is made most suitable. CONSTITUTION:There are provided an outdoor flow rate valve 14 arranged in series with the second auxiliary heat exchanger 9, refrigerant transporting device 11 arranged outside the outdoor units (a1) and (a2), the first temperature sensor 15 for detecting an inlet refrigerant temperature of the second auxiliary heat exchanger 9 during the cooling operation, the second temperature sensor 16 for sensing an outlet refrigerant temperature, a temperature difference calculating means 17 for calculating a temperature difference between the values of the first temperature sensor 15 and the second temperature sensor 16, and the outdoor side flow rate valve controlling means 18 for controlling a degree of opening of the outside flow rate valve 14 in response to the value calculated by the temperature difference calculating means 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-chamber cooling / heating apparatus which is divided into a heat source side refrigerant cycle and a use side refrigerant cycle.

[0002]

2. Description of the Related Art Conventionally, a refrigerant cycle of a multi-chamber cooling and heating apparatus separated into a heat source side refrigerant cycle and a use side refrigerant cycle is
As shown in Japanese Patent Application Laid-Open No. 62-238952, FIG.
Was configured like.

In FIG. 5, 1 is a compressor, 2 is a heat source side four-way valve, 3 is a heat source side heat exchanger, 4 is a cooling decompression device, 5 is a heating decompression device, and 6 is a cooling decompression device 4 during heating. Is a check valve for closing the heating decompression device 5 during cooling, and 8 is a first auxiliary heat exchanger, and these are connected in an annular shape to form a heat source side refrigerant cycle. .. 9 is the second
The auxiliary heat exchanger is integrally formed so as to exchange heat with the first auxiliary heat exchanger 8.

Reference numeral 10 is a refrigerant amount adjusting tank for adjusting the amount of refrigerant during cooling and during heating. Reference numeral 11 is a refrigerant transfer device. The constituent elements of the heat source side refrigerant cycle, the refrigerant amount adjustment tank 10 and the refrigerant transfer device 11 are the outdoor units a1 and a.
It is stored in 2. 12a and 12b are heat exchangers on the use side, which are housed in the indoor units b1 and b2, respectively, and are connected to the multi-liquid side connecting pipe c1, the small liquid side connecting pipe c2, and the small liquid side branch pipe d
1, d2 and the multi-liquid side branch pipes e1, e2, the heat source side unit a
Connected with.

Numeral 13 is a four-way valve on the use side, which is an indoor unit b
The flow direction of the refrigerant to 1 and b2 is changed by cooling and heating.

Second auxiliary heat exchanger 9, refrigerant amount adjusting tank 1
0, refrigerant transfer device 11, use side heat exchangers 12a, 12
b, use side four-way valve 13, multi-liquid side connecting pipe c1, low-liquid side connecting pipe c2, low-liquid side branch pipes d1, d2, multi-liquid side branch pipe e1,
The e2 and the e2 are connected in a ring shape to form a use side refrigerant cycle.

The operation of the cooling and heating apparatus configured as described above will be described. During the cooling operation, the refrigerant cycle is indicated by the solid arrow in the figure, and in the heat source side refrigerant cycle, the compressor 1
The high-temperature high-pressure gas from the heat source side four-way valve 2 radiates heat in the heat source side heat exchanger 3 to be condensed and liquefied, passes through the check valve 6 and is decompressed by the cooling expansion valve 4, and the first auxiliary heat exchanger. Evaporate at 8 and pass through the heat source side four-way valve 2 and circulate to the compressor 1.

At this time, the second auxiliary heat exchanger 9 and the first auxiliary heat exchanger 8 of the use side refrigerant cycle exchange heat, the gas refrigerant of the use side refrigerant cycle is cooled and liquefied, and the refrigerant amount adjusting tank 10, It is sent to the refrigerant carrier device 11 through the user-side four-way valve 13, and by this refrigerant carrier device 11, the user-side four-way valve 1
3, the use side heat exchanger 12 through the multi-liquid side connection pipe c1
It is sent to a and 12b, cooled and endothermicly evaporated, gasified and circulated to the second auxiliary heat exchanger 9 through the small liquid side connection pipe c2.

On the other hand, during the heating operation, the refrigerant cycle is indicated by the broken line arrow in the figure. In the heat source side refrigerant cycle, the high-temperature high-pressure refrigerant from the compressor 1 is transferred from the heat source side four-way valve 2 to the first
It is sent to the auxiliary heat exchanger 8, radiates heat to be condensed and liquefied, decompressed from the check valve 7 by the heating decompression device 5, absorbed and evaporated by the heat source side heat exchanger 3, and compressed through the heat source side four-way valve 2. Circulate to machine 1.

At this time, the second auxiliary heat exchanger 9 and the first auxiliary heat exchanger 8 of the utilization side refrigerant cycle exchange heat, the liquid refrigerant in the utilization side refrigerant cycle is heated and gasified, and the small liquid side connecting pipe It is sent to the use side heat exchangers 12a and 12b through c2 and the small liquid side branch pipes d1 and d2, and is heated and radiated to liquefy heat, and the multiple liquid side branch pipes e1 and e2 and the multiple liquid side connecting pipe c1 and the use side four-way valve are provided. It is sent to the refrigerant transfer device 11 through 13 and circulates from the refrigerant amount adjustment tank 10 to the second auxiliary heat exchanger 9.

[0011]

However, in the above-mentioned configuration, since the refrigerant transfer device 11 is provided for each of the outdoor units a1 and a2, the refrigerant transfer capacity of the entire system depends on the number of outdoor units a1 and a2. Therefore, the connection pipes c1, c2, d1, d2, e1, e2 of the outdoor units a1, a2 and the indoor units b1, b2 become longer than the refrigerant transport capacity of the entire system,
If the number of indoor units b1 and b2 increases, the capacity of the refrigerant transport device 11 becomes insufficient, and the capacity of each indoor unit b1 and b2 decreases and the capacity control becomes unstable.

Further, when the outdoor units a1 and a2 are operated with different capacities, it becomes difficult to properly divert the refrigerant to the outdoor units a1 and a2, and the efficiency of the system is significantly lowered, There was a risk that the protective device would operate and the operation would stop.

In view of the above-mentioned problems, the present invention provides the outdoor unit and the indoor unit with long pipe lengths, or when the outdoor units operate with different capacities, depending on the pipe lengths of the outdoor unit and the indoor unit. It is an object of the present invention to provide a multi-room cooling and heating apparatus which is provided with a refrigerant transporting device having the above-mentioned refrigerant transporting capacity and optimizes the refrigerant splitting flow to each outdoor unit so as to always perform stable operation with high efficiency.

[0014]

In order to solve the above-mentioned problems, a multi-room cooling and heating apparatus of the present invention is an outdoor unit having a second auxiliary heat exchanger and an outdoor flow valve arranged in series, A use-side refrigerant cycle formed by connecting a plurality of indoor units, a plurality of second auxiliary heat exchangers, the outdoor flow valve and the refrigerant transfer device in an annular shape, and an inlet refrigerant temperature of the second auxiliary heat exchanger during cooling A first temperature detector for detecting the temperature, a second temperature detector for detecting an outlet refrigerant temperature of the second auxiliary heat exchanger during cooling, and a second temperature detector based on a detection value of the first temperature detector.
When the value calculated by the temperature difference calculating means is larger than a predetermined value, the temperature difference is calculated by subtracting the detected value of the temperature detector to calculate the temperature difference between the inlet and the outlet of the second auxiliary heat exchanger,
And a controller provided with an outdoor flow valve control means for opening the outdoor flow valve by a predetermined amount and closing the outdoor flow valve by a predetermined amount when the temperature difference is smaller than a predetermined value.

Further, another multi-room cooling and heating apparatus of the present invention comprises an average temperature difference calculating means for averaging the values calculated by the temperature difference calculating means of a plurality of outdoor units and calculating an average temperature difference. When the value calculated by the average temperature difference calculating means is larger than a predetermined value, each outdoor side flow valve is opened by a predetermined amount, and when the value calculated by the average temperature difference calculating means is smaller than the predetermined value, the temperature difference calculating means is The calculated value and the value calculated by the average temperature difference calculation means are compared, and the value calculated by the temperature difference calculation means is larger than the value calculated by the average temperature difference calculation means. A control device comprising an outdoor flow valve control means for opening a predetermined amount and closing the outdoor flow valve of the outdoor unit by a predetermined amount, the value calculated by the temperature difference calculation means being smaller than the value calculated by the average temperature difference calculation means. Equipped And is're.

[0016]

The multi-room air conditioner of the present invention has the above-described structure and can be provided with a refrigerant carrier having a refrigerant carrying capacity according to the lengths of the outdoor unit and the piping of the indoor unit. 2 By controlling the outdoor flow rate valve of each outdoor unit so that the temperature difference between the refrigerant at the inlet and the outlet of the auxiliary heat exchanger is always kept at a predetermined value, the diverting of the refrigerant to each outdoor unit is always optimized. be able to.

Further, when the temperature difference between the refrigerant at the inlet and the outlet of each of the second auxiliary heat exchangers of the plurality of outdoor units is smaller than a predetermined value, the temperature difference of each second auxiliary heat exchanger is By controlling the opening of the outdoor flow valve so that it becomes equal to the average value of the temperature difference of the second auxiliary heat exchanger of the entire system, the outdoor flow rate of the outdoor unit whose temperature difference is less than the average value for the entire system. Since the opening of the outdoor flow valve of the outdoor unit whose temperature difference is greater than the average value is increased by the smaller opening of the valve, it is possible to always optimize the flow distribution of the refrigerant and open the outdoor flow valve. You can always keep the sum of degrees above a certain level,
It is possible to prevent overload operation of the refrigerant transfer device.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-room air conditioner according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a refrigerant cycle of a multi-room cooling and heating system according to an embodiment of the present invention.

In FIG. 1, 14 is the second auxiliary heat exchanger 9
An outdoor flow rate valve arranged in series with 11, a refrigerant transfer device 11 provided outside the outdoor units a1 and a2, and a first temperature 15 for detecting an inlet refrigerant temperature of the second auxiliary heat exchanger 9 during cooling. A detector, 16 is a second temperature detector for detecting the outlet refrigerant temperature of the second auxiliary heat exchanger 9 during cooling.

Reference numeral 17 is a temperature difference calculation means for subtracting the detection value of the second temperature detector 16 from the detection value of the first temperature detector 15 to calculate the temperature difference between the inlet and the outlet of the second auxiliary heat exchanger 9. 1
When the value calculated by the temperature difference calculating means 17 is larger than a predetermined value, the outdoor flow valve 14 is opened by a predetermined amount, and when the value calculated by the temperature difference calculating means 17 is smaller than the predetermined value, the outdoor flow valve 14 is placed. The temperature difference calculation means 17 and the outdoor flow rate valve control means 18 are an outdoor flow rate valve control means for quantitatively closing, and are configured in a control device 19.

The other structure is the same as that of the conventional example, and therefore the same reference numerals are used here and the description thereof is omitted.

The operation of this refrigerant cycle is also the same as that of the conventional example and the details thereof will be omitted. However, different from the conventional example, the refrigerant transfer device 11, the outdoor flow valve 14, the first temperature detector 15, and the second temperature detection. The device 16 and the control device 19 will be described below.

The refrigerant transfer device 11 includes the outdoor unit a1,
Since it is provided outside a2,
Refrigerant transfer device 11 having a refrigerant transfer capability according to the lengths of the pipes of the outdoor units a1 and a2 and the indoor units b1 and b2.
Can be installed.

Next, the refrigerant flow distribution to the outdoor units a1 and a2 will be described below. During the cooling operation, the first temperature detector 15 detects the temperature of the refrigerant which has been gasified and returned to the inlet of the second auxiliary heat exchanger 9 through the small liquid side connection pipe c2, and the second auxiliary heat exchanger 9 is detected. The second temperature detector 16 detects the temperature of the refrigerant at the outlet of the second auxiliary heat exchanger 9, which has been cooled by exchanging heat with the first auxiliary heat exchanger 8.

On the other hand, during the heating operation, the refrigerant amount adjusting tank 1
The temperature of the refrigerant sent from 0 to the inlet of the second auxiliary heat exchanger 9 is detected by the second temperature detector 16, and the second auxiliary heat exchanger 9
The first temperature detector 15 detects the temperature of the refrigerant overheated by exchanging heat with the first auxiliary heat exchanger 8.

The temperature difference calculating means 17 includes the first temperature detector 1
The detection value of the second temperature detector 16 is subtracted from the detection value of 5 (step 1), and when the value calculated by the temperature difference calculation means 17 is larger than the predetermined value, the outdoor flow valve control means 18 controls the outdoor flow valve. 14 is opened by a predetermined amount, and when it is smaller than the predetermined value, the outdoor flow valve 14 is closed by a predetermined amount (step 2).

Therefore, since the refrigerant circulation amount is controlled by each outdoor flow valve 14 so that the heat exchange amount of each second auxiliary heat exchanger 9 is always constant, the refrigerant distribution to the outdoor unit a is always appropriate. Becomes

As described above, according to the present embodiment, the refrigerant transfer device 11 having the refrigerant transfer ability according to the lengths of the pipes of the outdoor unit a and the indoor units b1 and b2 can be installed. It is possible to build a high lift system.

Further, in order to always keep the temperature difference between the inlet refrigerant temperature and the outlet refrigerant temperature of the second auxiliary heat exchanger 9 of each of the plurality of outdoor units a1 and a2 at a predetermined value, By controlling the outer flow rate valve 14, the split flow of the refrigerant to each of the outdoor units a1 and a2 can be always optimized, so that the system operation can always be stabilized and the operation efficiency can be improved.

Next, the second multi-chamber cooling and heating apparatus according to the present invention
Embodiment will be described with reference to the drawings, but the same reference numerals will be given to portions having the same configurations as those in the first embodiment, and detailed description thereof will be omitted.

FIG. 3 is a refrigerant cycle diagram of a multi-room cooling and heating system according to the second embodiment of the present invention.

In FIG. 3, 20 is an outdoor unit a.
1, a2 is an average temperature difference calculating means for calculating an average temperature difference from the temperature difference of the second auxiliary heat exchanger 9, 21 is a system control device accommodating the average temperature difference calculating means 20, and 18 is The outdoor flow rate valve control means controls the outdoor flow rate valve 14 based on the value calculated by the average temperature difference calculation means 20, the predetermined value at which the diversion is appropriate, and the value calculated by the temperature difference calculation means 17.

The control of the refrigerant split flow performed by the above configuration will be described below. FIG. 4 shows the outdoor flow valve 14
3 is a flowchart showing the flow of control of FIG.

In STEP 1, the average temperature difference calculating means 20
The values of the average temperature difference calculated in step 1 are taken in by the outdoor units a1 and a2, respectively, and the process proceeds to step 2.

In STEP 2, the average temperature difference calculating means 20
If the average temperature difference is smaller than the predetermined value, ST is compared with the predetermined value at which the refrigerant distribution is appropriate.
When the flow proceeds to EP3 and the value is larger than the predetermined value, the outdoor flow valve 14 is opened by the predetermined value. In this case, the outdoor units a1, a
Since each of the outdoor flow valves 14 of No. 2 is opened to a predetermined value, the value of the average temperature difference is reduced and is controlled to be a predetermined value.

In STEP 3, the average temperature difference calculating means 20
The outdoor unit whose average temperature difference value calculated in step 1 is larger than the value calculated by the temperature difference calculation means 17 closes the outdoor flow valve 14, and the outdoor unit whose value is smaller than the value calculated by the temperature difference calculation means 17 is the indoor unit. The outer flow valve 14 is opened to a predetermined value.

Therefore, when the temperature difference of the second auxiliary heat exchanger 9 of the outdoor unit a1 is less than or equal to the average value of the temperature difference of the entire system, the outdoor flow rate valve 1 of the outdoor unit a1.
Although the opening degree of 4 is small, the temperature difference of the second auxiliary heat exchanger 9 of the outdoor unit a2 at that time is more than the average value,
Since the opening degree of the outdoor side flow valve 14 is made large, the branching of the refrigerant can always be optimized, and the total opening degree of the outdoor side flow valve 14 as the entire system is always kept constant or more. The same applies when the temperature difference between the second auxiliary heat exchangers 9 of the outdoor unit a1 is equal to or higher than the average value of the temperature differences between the second auxiliary heat exchangers 9 of the entire system.

As described above, according to this embodiment, when the average value of the temperature difference between the refrigerant at the inlet and the outlet of each of the second auxiliary heat exchangers 9 of the outdoor units a1 and a2 becomes larger than the predetermined value. Increases the opening degree of each of the outdoor side flow valves 14 so that the temperature difference of the refrigerant in each of the second auxiliary heat exchangers 9 becomes a predetermined value, and each of the second auxiliary heat exchangers 9 of the outdoor units a1 and a2. When the average value of the temperature difference between the inlet and outlet refrigerants is smaller than a predetermined value, the temperature difference between the second auxiliary heat exchangers 9 is
By controlling the opening degree of the outdoor flow valve 14 so as to be equal to the average value of the temperature difference of the second auxiliary heat exchanger 9 of the entire system, the branch flow of the refrigerant can be always optimized and the chamber of the entire system can be controlled. Since the total opening of the outer flow valves is always maintained at a certain level or more, it is possible to always optimize the flow distribution of the refrigerant, and to prevent wear and damage due to overload operation of the refrigerant transfer device and extend the service life. can do.

[0040]

As described above, the multi-room air conditioner of the present invention has the outdoor unit having the second auxiliary heat exchanger and the outdoor flow valve arranged in series, the plurality of indoor units, and the plurality of indoor units. A second auxiliary heat exchanger, a use-side refrigerant cycle in which the outdoor flow valve and the refrigerant transfer device are connected to each other in an annular shape, and a first refrigerant temperature detecting means for detecting an inlet refrigerant temperature of the second auxiliary heat exchanger during cooling
A temperature detector, a second temperature detector that detects the outlet refrigerant temperature of the second auxiliary heat exchanger during cooling, and a detection value of the second temperature detector that is subtracted from the detection values of the first temperature detector Then
Temperature difference calculating means for calculating a temperature difference between the inlet and the outlet of the second auxiliary heat exchanger; and when the value calculated by the temperature difference calculating means is larger than a predetermined value, the outdoor flow valve is opened by a predetermined amount, and When the temperature difference is smaller than a predetermined value, the control device is provided with an outdoor flow valve control means that closes the outdoor flow valve by a predetermined amount. It is possible to provide a refrigerant transfer device having a refrigerant transfer capacity according to the temperature, so that the temperature difference between the inlet refrigerant temperature and the outlet refrigerant temperature of each of the second auxiliary heat exchangers of the plurality of outdoor units is always maintained at a predetermined value,
By controlling the outdoor flow valve of each outdoor unit,
Since the split flow of the refrigerant to each outdoor unit can be optimized, there is an effect that the operation of the system is always stabilized and the operation efficiency is improved.

Further, the present invention averages the values calculated by the respective temperature difference calculating means of the plurality of outdoor units, and calculates the average temperature difference, and the average temperature difference calculating means. When the measured value is larger than a predetermined value, each outdoor flow valve is opened by a predetermined amount, and when the value calculated by the average temperature difference calculating means is smaller than the predetermined value, the value calculated by the temperature difference calculating means and the average temperature are calculated. The values calculated by the temperature difference calculation means are compared with each other, and the value calculated by the temperature difference calculation means is larger than the value calculated by the average temperature difference calculation means. By providing a control device comprising an outdoor flow valve control means for closing the outdoor flow valve of the outdoor unit by a predetermined amount, the value calculated by the difference calculation means being smaller than the value calculated by the average temperature difference calculation means. , If the temperature difference between the refrigerant inlet and outlet of the second auxiliary heat exchanger of the plurality of the outdoor units becomes a predetermined value less than the temperature difference between the second auxiliary heat exchanger,
By controlling the opening of the outdoor flow valve so that it becomes equal to the average value of the temperature difference of the second auxiliary heat exchanger of the entire system, the outdoor flow rate of the outdoor unit whose temperature difference is less than the average value for the entire system. Since the opening of the outdoor flow valve of the outdoor unit whose temperature difference is greater than the average value is increased by the smaller opening of the valve, it is possible to always optimize the flow distribution of the refrigerant and open the outdoor flow valve. You can always keep the sum of degrees above a certain level,
It is possible to prevent overload operation of the refrigerant transfer device.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of a multi-room cooling and heating apparatus according to a first embodiment of the present invention.

FIG. 2 is a control flowchart of the outdoor flow valve according to the first embodiment of the present invention.

FIG. 3 is a refrigeration cycle diagram of a multi-room cooling and heating apparatus according to a second embodiment of the present invention.

FIG. 4 is a control flowchart of an outdoor flow valve according to a second embodiment of the present invention.

FIG. 5 is a refrigeration cycle diagram of a conventional multi-room air conditioner

[Explanation of symbols]

 3 Heat Source Side Heat Exchanger 8 First Auxiliary Heat Exchanger 9 Second Auxiliary Heat Exchanger 11 Refrigerant Transfer Device 12a, 12b Utilization Side Heat Exchanger 14 Outdoor Flow Valve 15 First Temperature Detector 16 Second Temperature Detector 17 Temperature difference calculating means 18 Outdoor flow rate valve controlling means 19 Control device 20 Average temperature difference calculating means 21 System control device a1, a2 Outdoor unit b1, b2 Indoor unit

Claims (2)

[Claims] 1. A heat source side refrigerant cycle comprising a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger connected in an annular shape, and the first auxiliary heat exchanger. A plurality of outdoor units each having a second auxiliary heat exchanger that is formed into a heat exchanger and that exchanges heat, an outdoor flow rate valve that is arranged in series with the second auxiliary heat exchanger, and a plurality of use-side heat exchangers Of the indoor units connected in parallel with each other, a plurality of the indoor units, a plurality of the second auxiliary heat exchangers, the outdoor side flow valve and a refrigerant transfer device, which are connected to each other in a ring shape; A first temperature detector for detecting an inlet refrigerant temperature of the second auxiliary heat exchanger, a second temperature detector for detecting an outlet refrigerant temperature of the second auxiliary heat exchanger during cooling, the first temperature detector The detection value of the second temperature detector is subtracted from the detection value of the detector, A temperature difference calculating means for calculating a temperature difference between the inlet and the outlet of the auxiliary heat exchanger, and when the value calculated by the temperature difference calculating means is larger than a predetermined value, the outdoor flow valve is opened by a predetermined amount, and the temperature difference is A multi-room cooling and heating device comprising: an outdoor flow valve control means for closing the outdoor flow valve by a predetermined amount when the value is smaller than a predetermined value. 2. A heat source side refrigerant cycle comprising a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger connected in an annular shape, and the first auxiliary heat exchanger. A plurality of outdoor units each having a second auxiliary heat exchanger that is formed into a heat exchanger and that exchanges heat, an outdoor flow rate valve that is arranged in series with the second auxiliary heat exchanger, and a plurality of use-side heat exchangers Of the indoor units connected in parallel with each other, a plurality of the indoor units, a plurality of the second auxiliary heat exchangers, the outdoor side flow valve and a refrigerant transfer device, which are connected to each other in a ring shape; A first temperature detector for detecting an inlet refrigerant temperature of the second auxiliary heat exchanger, a second temperature detector for detecting an outlet refrigerant temperature of the second auxiliary heat exchanger during cooling, the first temperature detector The detection value of the second temperature detector is subtracted from the detection value of the detector, A temperature difference calculating means for calculating the temperature difference between the inlet and the outlet of the auxiliary heat exchanger, and an average temperature difference for calculating the average temperature difference by averaging the values calculated by the temperature difference calculating means of the plurality of outdoor units. When the value calculated by the calculating means and the average temperature difference calculating means is larger than a predetermined value, each outdoor side flow valve is opened by a predetermined amount, and when the value calculated by the average temperature difference calculating means is smaller than the predetermined value, The value calculated by the temperature difference calculation means is compared with the value calculated by the average temperature difference calculation means, and the value calculated by the temperature difference calculation means is larger than the value calculated by the average temperature difference calculation means. An outdoor flow valve control means for opening the outdoor flow valve by a predetermined amount and closing the outdoor flow valve of the outdoor unit by a predetermined amount, the value calculated by the temperature difference calculating means being smaller than the value calculated by the average temperature difference calculating means. Equipped with Multi-chamber air conditioner characterized in that it is composed of a control unit.