WO1997011317A1

WO1997011317A1 - Multi-chamber air-conditioner

Info

Publication number: WO1997011317A1
Application number: PCT/JP1995/001879
Authority: WO
Inventors: Susumu Nakayama; Kensaku Oguni; Hiromu Yasuda; Yasutaka Yoshida
Original assignee: Hitachi, Ltd.
Priority date: 1995-09-20
Filing date: 1995-09-20
Publication date: 1997-03-27
Also published as: JP3199746B2

Abstract

This invention relates to a multi-chamber air-conditioner in which the consumption of electric power is minimized. The temperature of the air sucked by an indoor fan and that of the air discharged by the fan are detected, and the room cooling or heating capacity is determined on the basis of the difference between these temperatures, a target room cooling or heating capacity being set on the basis of the difference between the suction air temperature and a room temperature setting. The operating capacity of a variable-capacity compressor is controlled so that a total value of the room cooling or heating capacity agrees with that of the target room cooling or heating capacity.

Description

Specification

Multi-room air conditioner

Technical field

The present invention relates to a control device for a multi-room air conditioner, and more particularly to a multi-room air conditioner that consumes less power by ensuring the performance of an indoor unit.

Background art

Conventionally, the variable capacity compressor used in a multi-room air conditioner is such that the low pressure is equal to the set pressure during cooling, as described in JP-B-4-132298. The volume is controlled to reach the set pressure.

In the above prior art, the heat source temperature of each indoor heat exchanger can be kept almost constant, and the blowout temperature of each indoor unit is close to the heat source temperature if the imbalance of the refrigerant flow to each indoor unit does not occur. It is a control method with good controllability without temperature drop and capacity shortage. However, reducing power consumption was not considered.

Some indoor units connected to multi-room air conditioners have different indoor unit capacities and models, and some of these indoor fan airflows are not proportional to the indoor capacity. For example, if only a room unit with a large fan volume compared to the indoor unit capacity is operated with a compressor capacity commensurate with the indoor unit capacity, the low pressure pressure will increase during cooling and the high pressure pressure will decrease during heating. In the technology, since the pressure is controlled to be the set pressure, the capacity of the compressor is increased. As a result, the indoor unit has a capacity higher than the room unit capacity, and the power consumption is large.

In addition, as described in Japanese Patent Publication No. 411,139, Japanese Patent Publication No. 471,139, the refrigerant at the outlet of the indoor heat exchanger of each indoor unit is cooled. Valve opening provided on the liquid pipe side in each indoor unit so that the superheat degree at the outlet of the indoor heat exchanger becomes the set value during heating so that the superheat degree becomes the set value Is done with an adjustable motorized valve. In addition, a temperature sensor is attached to the refrigerant pipe to detect the refrigerant temperature at the outlet of the indoor heat exchanger.

During the cooling operation, moisture in the air adheres to the refrigerant pipe to which the temperature sensor is attached, and the moisture enters the temperature sensor and is erroneously detected. Sometimes not detectable. When this detection failure occurs, the error in detecting the degree of superheat of the refrigerant increases, and the refrigerant cannot be distributed to the indoor units in a satisfactory manner, resulting in an indoor unit with insufficient capacity.

For example, in the related art in which when the refrigerant superheat degree is detected to be larger than the actual one, the refrigerant superheat degree is set to a set value. Insufficient capacity of machine.

If the degree of superheat of the refrigerant is detected to be lower than it actually is, the indoor refrigerant flow regulating valve of the indoor unit is throttled, and the capacity of the indoor unit is insufficient.

During the heating operation, there are the following issues.

(1) If the indoor refrigerant flow control valve is throttled to increase the degree of subcooling and the refrigerant flow is reduced, the refrigerant temperature at the outlet between the room and heat exchanger approaches the intake air temperature, and the room and refrigerant flow control valve is opened. When the temperature is low, the refrigerant temperature at the outlet of the indoor heat exchanger hardly changes even if the opening is changed.

As a result, the indoor refrigerant flow control valve is excessively throttled, and the liquid refrigerant is excessively accumulated in the indoor heat exchanger, so that the amount of refrigerant circulating in the refrigeration cycle is insufficient, and the performance of other indoor units is reduced.

(2) The amount of refrigerant flowing to the stopped indoor unit must be reduced as much as possible from the viewpoint of power saving, and the indoor refrigerant flow control valve is controlled to be slightly opened.

However, when the opening of the chamber / refrigerant flow control valve is slightly opened and the flow rate of the refrigerant is very small, the refrigerant temperature at the outlet of the indoor heat exchanger hardly changes from the temperature when no refrigerant flows. Therefore, when the indoor refrigerant flow control valve is fully closed, the refrigerant accumulates as a liquid in the indoor heat exchanger and circulates in the refrigeration cycle as described above. Insufficient refrigerant causes a decrease in the capacity of the operating indoor unit.

Therefore, conventionally, it is difficult to control the indoor refrigerant flow control valve so as not to be fully closed in the vicinity of the slightly open state. Therefore, a minimum opening degree is provided and the control is performed so as not to be less than the minimum opening degree.

However, even if the minimum opening is set, the amount of liquid refrigerant accumulated in the indoor heat exchanger is unknown, so the amount of refrigerant circulating in the refrigeration cycle is insufficient, and some indoor units have insufficient capacity.

Further, as described in Japanese Patent Laid-Open No. 3-2944752, the distribution of the flow rate of the refrigerant flowing through each indoor unit during heating is determined by comparing the temperature of the blown air and the temperature of the intake air of each indoor unit. An indoor refrigerant flow control valve is provided on the liquid pipe side in each indoor unit that can adjust the valve opening so that the temperature difference becomes the set value.

In the conventional technology, the distribution of the outlet temperature and the short circuit in which the outlet air flows to the suction side as it is cannot distribute the refrigerant in proportion to the capacity of the indoor unit, resulting in an indoor unit with insufficient capacity.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art, control the capacity of a compressor so that the total capacity of an operating indoor unit becomes the total value of required capacity, and reduce power consumption corresponding to the required capacity of the indoor unit It provides a multi-room air conditioner that consumes less power especially in heating operation.

Another object of the present invention is to provide a multi-room air conditioner in which the amount of refrigerant circulating in a refrigeration cycle is ensured and the capacity is prevented from being insufficient.

Disclosure of the invention

The multi-room air conditioner according to the present invention includes means for determining cooling or heating capacity based on a temperature difference between an intake air temperature and an outlet air temperature of an indoor unit, and target cooling based on a difference between the intake air temperature and a room temperature set value. Or means for determining the heating capacity, and controls the operating capacity of the variable displacement compressor so that the total value of the cooling or heating capacity becomes the total value of the target cooling or heating capacity. Also provided are means for determining the cooling capacity based on the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, and means for determining the target cooling capacity based on the difference between the intake air temperature and the room temperature set value. The operating capacity of the variable capacity compressor is controlled so that the value becomes the total value of the target cooling capacity. In addition, means for determining the cooling capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the air density, the specific heat of air, and the sensible heat ratio, and the intake air temperature Means for determining the target cooling capacity based on the difference between the target cooling capacity and the room temperature setting value, and controls the operating capacity of the variable displacement compressor so that the total value of the cooling capacity becomes the total value of the target cooling capacity.

In addition, a means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the density of air, and the specific heat of air, and the setting of the intake air temperature and room temperature Means for determining the target heating capacity based on the difference between the target heating capacity and the operating capacity of the variable displacement compressor so that the total heating capacity is equal to the total target heating capacity.

In addition, a means for determining the cooling capacity based on the temperature difference between the suction air temperature and the blow-out air temperature of the indoor unit, and the target cooling when the difference between the suction air temperature and the room temperature set value is 2 to 4 T: greater than If the capacity is defined as the rated cooling capacity of the indoor unit, and if it is 2 to 4, the target cooling capacity shall be set to be equal to or less than the rated cooling capacity of the indoor unit. The operating capacity of the variable capacity pressure box machine is controlled so that the total value is obtained.

Furthermore, means for determining the heating capacity based on the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, and setting the target heating capacity when the difference in the intake air temperature is greater than 2 to 4 from the room temperature set value. A means to set the target heating capacity to be equal to or less than the rated heating capacity of the indoor unit when the rated heating capacity of the indoor unit is 2 to 4 or less, and the total value of the heating capacity is the total value of the target heating capacity The operating capacity of the variable capacity compressor is controlled so that Further, in the above description, the opening degree of the room coolant flow control valve is controlled so that the cooling capacity becomes the target cooling capacity.

Further, in the above, the opening degree of the indoor coolant flow control valve is controlled so that the heating capacity becomes the target heating capacity.

Furthermore, a means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the density of the air, and the specific heat of the air, Means for determining the target heating capacity based on the difference, means for controlling the operating capacity of the variable capacity compressor such that the total value of the heating capacity becomes the total value of the target heating capacity, and means for controlling the heating capacity to the target heating capacity. Means for controlling the opening of the indoor refrigerant flow regulating valve so that the maximum opening of the indoor refrigerant flow regulating valve is smaller than the full opening when the discharge pressure of the variable capacity pressure box is below a predetermined value. Means.

In addition, a means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the air density, and the specific heat of the air, and the intake air temperature and the room temperature set value. Means for determining the target heating capacity based on the difference between the heating capacity, means for controlling the operating capacity of the variable displacement compressor so that the total value of the heating capacity becomes the total value of the target heating capacity, and means for controlling the heating capacity to the target heating capacity. Means for controlling the degree of opening of the indoor refrigerant flow regulating valve, and a pressure switch that is turned off when the discharge pressure of the variable displacement compressor becomes 15 to 20 kcm ² or less. When the switch is turned off, the maximum opening of the indoor refrigerant flow control valve is defined as (full opening X 0.5).

Furthermore, a means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the density of the air, and the specific heat of the air, the intake air temperature and the room temperature set value, Means for determining the target heating capacity based on the difference between the heating capacity, means for controlling the operating capacity of the variable displacement compressor so that the total value of the heating capacity becomes the total value of the target heating capacity, and means for controlling the heating capacity to the target heating capacity. Means for controlling the degree of opening of the indoor refrigerant flow control valve so that the maximum opening degree of the indoor refrigerant flow control valve is smaller than the full opening degree when the intake air temperature is equal to or lower than a predetermined value. I have.

In addition, a means for determining the heating capacity from the temperature difference between the intake air temperature and the air temperature of the indoor unit and the air temperature of the indoor unit, the wind ft of the indoor unit, the density of the air, and the specific heat of the air, Means for determining the target heating capacity based on the difference from the set value, means for controlling the operating capacity of the variable displacement pressure machine so that the total value of the heating capacity becomes the total value of the target heating capacity, and means for controlling the heating capacity. Means for controlling the opening of the indoor refrigerant flow control valve to achieve the target heating capacity. When the suction air temperature is between 20 and 25, the maximum opening of the indoor refrigerant flow control valve is set to (fully open). The opening X 0.5).

Further, in the above description, the cooling capacity is obtained by correcting with the correction coefficient of the temperature distribution of the blown air temperature and the indoor air flow coefficient.

Further, in the above description, the heating capacity is obtained by correcting the correction coefficient of the temperature distribution of the blown air temperature and the indoor air volume coefficient.

In addition, a method for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the air density, and the specific heat of the air, and the intake air temperature and room temperature set value Means to determine the target heating capacity based on the difference between the two, and means to control the operating capacity of the variable capacity compressor so that the total value of the heating capacity becomes the total value of the target heating capacity. A liquid tank is provided, and during the heating operation, the opening of the indoor refrigerant flow control valve of the indoor unit is changed according to the opening of the outdoor refrigerant flow control valve.

Further, in the above, when the opening degree of the outdoor refrigerant flow control valve is equal to or less than (0.5 X full opening degree), the minimum opening degree of the indoor refrigerant flow control valve is set to (0.IX full opening degree). When the opening of the outdoor refrigerant flow regulating valve is equal to or more than (0.8 X full opening), the minimum opening of the indoor refrigerant flow regulating valve is set to (0.4 x full opening), When the opening degree of the outdoor refrigerant flow control valve is between (0.5 X full opening) and (0.8 X full opening), the minimum opening degree of the indoor refrigerant flow control valve is (0.IX full opening). It is a value proportional to the opening of the outdoor refrigerant flow control valve with a value from to (0.4 X full opening).

With the above configuration, the following operation is performed.

The means for determining the cooling or heating capacity based on the temperature difference between the suction air temperature and the blow-out air temperature of the indoor unit is to detect the temperature of the suction unit and the blow-out unit of the indoor unit using a temperature sensor and calculate the value of the difference. It means to calculate the cooling or heating capacity currently in operation based on this. Specifically, a microcomputer provided in an indoor controller or an outdoor controller is used.

Similarly, the means for determining the target cooling or heating capacity based on the difference between the suction air temperature and the set value is based on the difference between the already detected suction air temperature and the set room temperature, and the target cooling or heating capacity. This means that a specific relationship is determined in advance by a micro computer provided in an indoor controller or an outdoor controller. Controlling the operating capacity of the variable displacement compressor so that the total value of the cooling or heating capacity becomes the total value of the target cooling or heating capacity means that the cooling or heating capacity of each indoor unit calculated above and the above This means that the specified target cooling or heating capacity of each indoor unit is sent to the outdoor unit controller, and the operating capacity of the variable displacement compressor in the outdoor unit is controlled based on the sum of the two. Specifically, the microcomputer provided in the outdoor controller calculates the sum of the calculated cooling or heating capacity of each indoor unit and the determined total cooling or heating capacity of each indoor unit. This is performed by obtaining the motor speed of the variable displacement compressor from the deviation and controlling the displacement of the variable displacement compressor.

As a result, the variable capacity compressor is less than the total capacity of the operating indoor units. The compressor is no longer operated with the above capacity, and the compressor is operated with a compressor capacity corresponding to the total required capacity of each indoor unit. Therefore, the multi-room air conditioner can be operated with power consumption that matches the required capacity of each indoor unit.

Further, in the above, the capacity of the variable displacement compressor is controlled from the deviation between the total value of the cooling capacity of each of the indoor units calculated only during the cooling operation and the determined total value of the target cooling capacity of each of the indoor units. Even in this case, the power consumption can be effectively reduced.

Furthermore, the means for determining the cooling capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit and the air volume of the indoor unit, the density of air, the specific heat of air, and the sensible heat ratio are as follows. The temperature of the inlet and outlet is detected using a temperature sensor, and the difference between the temperature, the air volume of the air conditioner, the air density, the specific heat of air, and the sensible heat ratio is used to determine the current operating cooling. This means calculating the capacity. Specifically, a micro computer provided in an indoor controller or an outdoor controller is used. Thus, the cooling capacity can be accurately calculated.

Furthermore, the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit and the means for determining the heating capacity from the air volume of the indoor unit, the density of the air, and the specific heat of the air are as follows. Means to detect the temperature of the unit using a temperature sensor and calculate the heating capacity during the current operation from the value of the difference, the air volume of the indoor unit, the density of the air, and the specific heat of the air. Specifically, a microcomputer provided in an indoor controller or an outdoor controller is used. This enables accurate calculation of the heating capacity.

Furthermore, when the difference between the intake air temperature and the room temperature set value is greater than 2 to 4, the target cooling capacity is the rated cooling capacity of the indoor unit, and when the difference is 2 to 4 or less, the target cooling capacity is the indoor cooling capacity. The means for determining the cooling capacity of the indoor unit or lower is that the suction unit of the indoor unit is detected using a temperature sensor and the value is detected. If the set temperature is 2 to 4 larger than the set temperature, the cooling load is large, so the target cooling capacity is the rated cooling capacity of the indoor unit, and the difference from the room temperature set value is 2 to 4 mm or less. Means that the target cooling capacity is determined as a value equal to or less than the rated cooling capacity because the cooling load is small.Specifically, it is determined by the microcomputer provided in the indoor controller or the outdoor controller. You. As a result, the target cooling capacity can be appropriately determined according to the room temperature set value (cooling load).

In addition, when the difference between the intake air temperature and the set room temperature is larger than 2 to 4, the target heating capacity is set to the rated heating capacity of the indoor unit.When the difference is 2 to 4, the target heating capacity is set to the target heating capacity. The means for determining the capacity as being equal to or less than the rated heating capacity of the indoor unit is to detect the suction unit of the indoor unit using a temperature sensor, and if the room temperature set value is 2 to 4 mm greater than that value, heating Since the load is large, the target heating capacity is set to the rated heating capacity value of the indoor unit.When the difference from the room temperature setting value is 2 to 4 * C or less, the heating load is small and the target heating capacity is set to the rated heating capacity or less. This means that it is determined as the value of. Specifically, it is determined by a microcomputer provided in the indoor controller or the outdoor controller. As a result, the target heating capacity can be appropriately determined according to the room temperature set value (heating load).

Further, in the above, the cooling capacity of each indoor unit can be directly controlled by controlling the opening of the indoor coolant flow control valve so that the cooling capacity becomes the target cooling capacity. This will ensure that the cooling capacity of the machine will not be insufficient.

Further, in the above, the heating capacity of each indoor unit can be directly controlled by controlling the opening of the indoor coolant flow control valve so that the heating capacity becomes the target heating capacity. Heating capacity of each indoor unit can be prevented from becoming insufficient. Further, in the heating operation, when the discharge pressure of the variable capacity compressor is equal to or lower than a predetermined value, the means for making the maximum opening of the indoor refrigerant flow regulating valve smaller than the full opening is to discharge the compressor. Side, a signal is input to the outdoor controller, and when the discharge pressure falls below a predetermined value is detected by turning off or on the pressure switch. This means that the maximum opening of the room / refrigerant flow control valve is smaller than the full opening, and is specifically determined by a microcomputer provided in an indoor controller or an outdoor controller. As a result, the flow path resistance of the indoor refrigerant control valve increases, and the discharge pressure rises, and accordingly, the condensing pressure, that is, the temperature of the solidification box rises. And since the temperature of the box is the temperature of the heat source, the heating capacity also increases. Therefore, the capacity of the indoor unit is increased, and the operating capacity of the compressor is reduced by the increased amount, and power saving can be achieved.

Et al is, in the above, the discharge pressure of the variable displacement compressor becomes 1 5 to a ² 0 kg Z cm 2 or less which is a normal operating pressure when using HCF 2 2 R and 4 0 7 C the refrigerant When the pressure switch is turned off, the maximum opening of the indoor refrigerant flow control valve is smaller than the full opening, and the opening is not too restrictive (full opening X 0.5). As a result, the capacity of the indoor unit can be increased, and the operating capacity of the compressor can be reduced by the increased amount.

In addition, in the heating operation, when the suction air temperature is equal to or lower than a predetermined value, the means for making the maximum opening of the chamber / refrigerant flow control valve smaller than the full opening is that the suction unit of the indoor unit is connected to a temperature sensor. When the value is equal to or less than a predetermined value, it means that the maximum opening of the indoor refrigerant flow control valve is smaller than the full opening, specifically, The determination is made by a micro computer provided in the controller or outdoor controller. As a result, the capacity of the indoor unit is increased as described above, and the operating capacity of the compressor Power consumption can be reduced.

Further, in the above, when the heating load with the suction air temperature of 20 to 25 or less is relatively large, the maximum opening of the indoor refrigerant flow regulating valve is smaller than the full opening and the opening is not too narrow. (Full opening XO .5), it is possible to increase the capacity of the indoor unit required for heating capacity, and to reduce the operating capacity of the compressor by the increase.

Further, in the above, the cooling capacity is obtained by correcting the temperature distribution correction coefficient of the blown-out air temperature and the indoor air volume coefficient, so that the environment of the room where the indoor unit is installed (S) Humidity, short circuit, etc.) and room equipment characteristics (indoor fan airflow, blown air temperature distribution, etc.) can be corrected. This makes it possible to accurately detect the functional capacity of the room and to ensure the functional capacity of the room.

Furthermore, in the above, the heating capacity is determined by correcting the correction coefficient of the temperature distribution of the blown air temperature and the indoor air flow coefficient, so that the calculation of the heating capacity of the indoor unit is made more accurate. An accurate control of the indoor refrigerant flow regulating valve and the pressure box machine capacity can be realized.

In addition, during the heating operation, the opening degree of the indoor refrigerant flow control valve of the indoor unit is changed according to the opening degree of the outdoor refrigerant flow control valve, so that the liquid refrigerant flows into the indoor heat exchanger 內. The problem of refrigerant shortage due to excessive accumulation is eliminated. Thus, the shortage of the heating capacity of the indoor unit can be prevented.

Further, in the above, when the opening degree of the outdoor refrigerant flow control valve is equal to or less than the normal use range (0.5 X full opening degree), the minimum opening degree of the indoor refrigerant flow control valve is set to (0.IX When the opening of the outdoor refrigerant flow control valve is equal to or more than (0.8 X full opening), the refrigerant is in a shortage state and the minimum opening of the indoor refrigerant flow control valve is set to (0.4 X full opening). When the opening of the outdoor refrigerant flow control valve is between (0.5 x full opening) and (0.8 x full opening), the indoor refrigerant flow is The minimum opening of the flow control valve is a value from (0.4 IX full opening) to (0.4 X full opening) and is proportional to the opening of the outdoor refrigerant flow control valve. It is possible to prevent the shortage of the refrigerant within a practical range without excessively restricting the refrigerant flow control valve.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a configuration of a refrigeration cycle of a multi-room air conditioner according to one embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the difference between the indoor unit intake air temperature and the set temperature, and the target cooling capacity ratio of the indoor unit.

FIG. 3 is a block diagram showing a compressor capacity control method during a cooling operation.

FIG. 4 is a block diagram showing a method of controlling the opening of the indoor refrigerant flow control valve during the cooling operation.

FIG. 5 is a graph showing the relationship between the difference between the indoor unit intake air temperature and the set temperature, and the target heating capacity ratio of the indoor unit.

FIG. 6 is a block diagram showing a compressor capacity control method during a heating operation.

FIG. 7 is a block diagram showing a configuration of a refrigeration cycle of a multi-room air conditioner according to another embodiment of the present invention.

FIG. 8 is a graph showing the relationship between the operation of the pressure switch with respect to the discharge pressure and the maximum opening of the indoor refrigerant flow control valve.

FIG. 9 is a graph showing the relationship between the temperature of the chamber and the maximum opening of the refrigerant flow regulating valve with respect to the temperature of the suction air.

FIG. 10 is a plan view showing a component arrangement of a control board of an indoor controller of the indoor unit.

Fig. 11 shows the combination and operation of the ON / OFF of the dip switch on the control board. FIG. 6 is a relationship diagram showing arithmetic coefficients.

FIG. 12 is a block diagram showing a configuration of a refrigeration cycle of a multi-room air conditioner during a heating operation according to one embodiment of the present invention.

FIG. 13 is a graph showing the relationship between the opening degree of the outdoor refrigerant flow control valve, the minimum opening degree of the indoor refrigerant flow control valve, and the opening degree of the indoor refrigerant flow control valve of the stop room.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing a configuration of a refrigeration cycle of a multi-room air conditioner according to one embodiment of the present invention. In FIG. 2, the horizontal axis shows the deviation between the indoor unit intake air temperature and the set temperature, and the vertical axis shows the relationship between the indoor unit's target cooling capacity ratio and the vertical axis. FIG. 3 is a block diagram showing a capacity control method of the pressure box machine during the cooling operation. FIG. 4 is a block diagram showing a method of controlling the opening degree of the chamber / refrigerant flow control valve during the cooling operation. FIG. 5 is a graph showing the deviation between the indoor unit suction air temperature and the set temperature on the horizontal axis, and the relationship between the indoor unit's target heating capacity ratio and the vertical axis on the vertical axis. FIG. 6 is a block diagram showing a compressor capacity control method during the heating operation.

The outdoor unit 100 and the indoor units 200 and 300 are connected by a gas pipe 121 and a liquid pipe 122. The outdoor unit 100 is a compressor with variable motor rotation speed 105, a four-way valve 106, an outdoor heat exchanger 101, an outdoor refrigerant flow control valve 102, an outdoor fan 103, and an accumulator. , An outdoor controller 151, and a discharge temperature detector 115.

The outdoor controller 15 1 receives the signal of the discharge temperature detector 115, and outputs a signal for controlling the rotation speed of the motor (not shown) of the compressor 105 and the outdoor refrigerant flow control valve 102. Output. The indoor unit 200 includes an indoor heat exchanger 201, an indoor refrigerant flow control valve 202, an indoor fan 203, a temperature detector 204, 206, 207, and an indoor controller.

It consists of 208.

The indoor controller 208 receives the signals of the temperature detectors 204, 206, and 207, and controls the opening degree of the indoor refrigerant flow control valve 202.

Similarly, the indoor unit 300 includes the indoor heat exchanger 310, the indoor refrigerant flow control valve 302, the indoor fan 300, the temperature detectors 304, 306, 300, and the indoor. The controller 308 is composed of a room temperature controller 308,

The signals of 306 and 307 are input to control the opening of the indoor refrigerant flow control valve 302.

The temperature sensors 204 and 304 are attached to the liquid refrigerant pipes of the indoor heat exchangers 201 and 301, respectively, and detect the liquid refrigerant temperature. The temperature sensors 206 and 303 detect the intake air temperature of the indoor units 200 and 300, respectively. The temperature sensors 207 and 307 detect the temperature of the blown air from the indoor units 200 and 300, respectively.

The outdoor controllers 208 and 308 and the outdoor controller 151 are connected by a transmission line, and exchange various signals.

The operation of each unit during the cooling operation will be described.

Solid arrows in the gas pipe 122 and the liquid pipe 122 indicate the flow direction of the refrigerant during the cooling operation, and the solid arrows in the indoor units 200 and 300 indicate the air flow direction.

The refrigerant discharged from the compressor 105 passes through the four-way valve 106, enters the outdoor heat exchanger 101, is heat-exchanged with outdoor air sent by the outdoor fan 103, and is solidified. It becomes a liquid refrigerant. Next, the condensed refrigerant passes through the outdoor refrigerant flow control valve 102 that is fully opened, and is sent to the indoor units 200 and 300 via the liquid pipe 122. In addition, the liquid refrigerant is supplied to the indoor refrigerant flow control valve. It expands and decompresses in 202, enters the indoor heat exchanger 201, and exchanges heat with the indoor air sent by the indoor fan 203 to evaporate. Then, the cooled indoor air is blown into the room from the indoor unit 200.

Similarly, the refrigerant entering the indoor unit 300 is decompressed by the indoor refrigerant flow control valve 302, enters the indoor heat exchanger 301, and exchanges heat with the indoor air sent by the indoor fan 303. Evaporate. Then, the cooled room air is blown out from the room machine 300.

The refrigerant discharged from the indoor unit 200 and the indoor unit 300 merges and is sent to the outdoor unit 100 through the gas pipe 122. Further, the refrigerant is sucked into the compressor 105 through the four-way valve 106 and the accumulator 104, compressed, and discharged again.

Next, a control method during the cooling operation will be described step by step.

(1) The indoor controller 208 obtains the cooling capacity Qc2 of the indoor unit 200 by using the temperature difference (t206-t207) between the intake air temperature and the blown air temperature as follows: 1) Calculate from

Q c 2 = — ^ ~ —- Va 2 »(t 206- t 207) (1)

SHF 2>

(2) Similarly, the indoor controller 300 determines the cooling capacity Qc3 of the indoor unit 300 as the temperature difference between the intake air temperature and the blown air temperature (t306—t30).

It is calculated by the following equation (2) using 7).

Q c 3 = ³ ' ^{VaVa 3-} (t 306-t 307) (2)

SHF 3 '

(3) The calculated cooling capacity values Qc2 and Qc3 are sent to the outdoor controller 151, and the total cooling capacity value QcT is calculated by the following equation (3). .

Q c T = Q c 2 + Q c 3 (3)

In the above, each symbol is

Cp. , Cp ₃ : Specific heat of air SHF 2, SHF 3: Sensible heat ratio (0.7)

t206, t306: detected values of temperature sensors 206, 306

t207, t307: Detection values of temperature sensors 207, 307

V a 2, V a 3: Air volume of indoor unit 200, 300

p 2 and p 2 are the densities of air, and the sensible heat ratio S H F 2 and S H F 3 are 0.7 in this embodiment. V a2 and V a3 are the indoor airflow, which can be changed by the operation airflow tap of the indoor unit.

() The indoor controller 208 determines the indoor temperature from the relationship shown in Fig. 2 by the difference (t206-ts2) between the intake air temperature t206 of the indoor unit 200 and the room temperature set value ts2. The target cooling capacity ratio _α 2 of the machine 200

Q c 20 = α2Q c 200 (4)

Q c 200: Rated cooling capacity of room 200

As a result, the target cooling capacity Q c 20 of the indoor unit 200 is calculated.

(5) Similarly, the target cooling capacity Q c 30 of the indoor unit 300 is

Q c 30 = α3Q c 300 (5)

Q c 300: The rated cooling capacity of the room machine 300

It is calculated as

(6) The values of the target cooling capacity Qc20 and Qc30 are sent to the outdoor controller 151, and the total value of the target cooling capacity QcT0 is

Q c T 0 = Q c 20 + Q c 30 (6)

Is required.

(7) As shown in Fig. 3, the outdoor controller 15 1 calculates the pressure from the deviation between the total value QcTO of the target cooling capacity in (6) and the total value QcT of the cooling capacity in (3). The motor speed of the compressor 105 is obtained by PID calculation, and the capacity of the compressor is controlled. (8)-As shown in Fig. 4, the cooling capacity Qc2, Qc3 of the indoor units 200, 300 is the target cooling by the indoor refrigerant flow control valves 202, 302. The power is controlled so as to approach Qc20 and Qc30.

In the above, as shown in Fig. 2, the differences (t206-ts2) and (t306-ts3) between the intake air temperature and the room temperature set value are larger than 4, and sometimes the target The cooling capacity ratios α 2 and α 3 are 1 respectively, and the target cooling capacity Q c 20 and Q c 30 of the indoor units 200 and 300 are the same as the rated cooling capacity of the indoor units 200 and 300. Become.

When (t206-ts2) and (t306-ts3) are 4 or less, the target cooling capacity ratios α2 and α3 decrease to 1 or less, respectively, and the target cooling capacity Qc2 0, Qc30 becomes equal to or less than the rated cooling capacity of the indoor units 200, 300, and the capacity of the indoor units 200, 300 is controlled.

(t 206-ts 2), (t 306-ts 3) force; When it becomes 0 or less, the air conditioner turns off and the target cooling capacity ratios α 2 and α 3 become 0. Become. Note that the rated cooling capacity varies depending on the length of the gas piping 122 and the liquid piping 122, and the longer the piping length, the lower the rated cooling capacity.

Next, the operation during the heating operation will be described.

The dashed arrows shown in the gas pipe 122 and the liquid pipe 122 indicate the direction of the refrigerant flow during the heating operation.

The refrigerant discharged from the pressure box unit 105 passes through the four-way valve 106, enters the gas pipe 121, and is sent to the indoor units 200, 300. The refrigerant that has entered the indoor unit 200 enters the indoor heat exchanger 201, exchanges heat with the indoor air sent by the indoor fan 203, condenses, and warms the indoor air. Further, the condensed refrigerant exits the indoor unit 200 through the indoor refrigerant flow control valve 202.

Similarly, refrigerant entering indoor unit 300 is condensed and exits indoor unit 300. You. The refrigerants that have exited the outdoor units 200 and 300 join and enter the outdoor unit 100 through the liquid pipe 122. Further, the refrigerant is depressurized by the indoor refrigerant flow control valve 102 and enters the outdoor heat exchanger 101, where it exchanges heat with the outdoor air sent by the outdoor fan 103 to evaporate, and evaporates. It is sucked into the compressor 105 through the valve 106 and the accumulator 104, compressed, and discharged again.

Next, a control method during the heating operation will be described step by step.

(1) The indoor controller 208 of the indoor unit 200 receives the heating capacity Qh2 of the indoor unit 200, and calculates the temperature difference between the intake air temperature and the blown air temperature (t207-t

It is calculated by the following equation (7) using 206).

_{Q h 2 = C p 2 ·} ρ 2 · V a 2 · (t 207 - t 206) (7)

(2) Similarly, the room controller 300 of the indoor unit 300 determines the heating capacity Q h3 of the indoor unit 300 as the temperature difference (t 3

It is calculated by the following equation (8) using 0 7 t 3 06).

_{Q h 3 = C p 3 ·} p 3 · V a 3 · (t 307 - t 306) (8) (3) the value of the heating capacity is respectively calculated Q h 2, Q h 3 is the outdoor controller 1 5 The total value of heating capacity QhT is calculated as shown in the following equation (9).

QhT = Qh 2 + Qh 3 (9)

() The indoor controller 208 is based on the difference (ts 2 -t 206) between the intake air temperature t 206 of the indoor unit 200 and the room temperature set value ts 2 (ts 2 -t 206) from the relationship shown in FIG. The target heating capacity ratio of 200/32 is found,

Qh 20 = β2Qh 200 (1 0)

Qh200: Rated heating capacity of indoor unit 200

As a result, the target heating capacity Qh20 of the room machine 200 is calculated.

(5) Similarly, the target heating capacity Q h30 of the indoor unit 300 is

Q h 30 = β3Q h 300 (1 1) Q h 300: Rated heating capacity of indoor unit 300

It is calculated as

(6) The values of the target heating capacity Qh20 and Qh30 are sent to the outdoor controller 151, and the total value of the target heating capacity QhT0 is

Q h T 0 = Q h 20 + Q h 30 (1 2)

Is required.

(7) As shown in FIG. 6, the outdoor controller 15 1 determines the compressor based on the deviation between the total heating capacity QhTO of (6) and the total heating capacity QhT of (3). Calculate the motor speed of 105 by P 1 D operation and control the capacity of the compressor. _C (8) — The heating capacity Q h2 and Q h 3 of the indoor units 200 and 300 As in the case of cooling in FIG. 4, the indoor refrigerant flow control valves 202 and 302 are controlled so as to approach the target heating capacity Qh20 and Qh30.

Further, the outdoor refrigerant flow regulating valve 102 is controlled by the outdoor controller 15 1 so that the discharge temperature of the compressor 105 detected by the discharge temperature detector 115 becomes the set temperature.

The rated heating capacity varies depending on the length of the gas pipes 122 and liquid pipes 122, and the longer the pipe length, the lower the rated heating capacity.

According to the present embodiment, since it is not necessary to control the low pressure and the high pressure, each pressure sensor is not required, and the cost is reduced. Another embodiment of the present invention is shown in FIG. 7, FIG. 8, and FIG.

FIG. 7 is a block diagram showing a configuration of a refrigeration cycle of a multi-room air conditioner according to another embodiment of the present invention. FIG. 8 is a graph showing the relationship between the operation of the pressure switch with respect to the discharge pressure and the maximum opening of the indoor refrigerant flow control valve. FIG. 9 is a graph showing the relationship between the indoor suction air temperature and the maximum opening of the indoor refrigerant flow control valve. In the embodiment shown in FIG. 7, pressure switches 107 and 108 are mounted on the compressor discharge side of the embodiment shown in FIG. 1, and their signals are inputted to the outdoor controller 15 1. The flow and control method of the refrigerant during the cooling operation are the same as in the embodiment of FIG.

Also, the flow and control method of the refrigerant during the heating operation are the same as in the embodiment of FIG. 1, but the maximum opening degree of the indoor refrigerant flow regulating valves 202 and 302 during the heating operation is shown in FIG. As shown, the combination of the output signals of the pressure switches 107 and 108 is changed.

ON when the pressure sweep rate pitch 1 0 7 exceeds ^{2 0 kgcm 2, 2 0 kg} / cm 2 and OFF in the following, pressure sweep rate pitch 1 0 8 ² 4 kg / cm 2 the Ru exceeds the ON, Z dkg Turns off when Z cm ² or less.

When the pressure switch 108 is turned on, the indoor refrigerant flow regulating valve 202, 302 turns the full opening of the indoor refrigerant flow regulating valve to the maximum opening, and the pressure switch 107 When OFF, the full opening X 0.5 is the maximum opening.

When the pressure switch 107 is ON and the pressure switch 108 is OFF, the maximum opening is not changed.

The above is the case where HCF22 or R407C is used as the refrigerant, and when R410A or R410B is used as the refrigerant, the pressure switch 107 becomes 3 1 exceeds kg / cm ² and OFF in ON, 3 1 kg / cm ² or less, the pressure sweep rate pitch 1 0 8 is turned OFF at exceeds ^{3 5 kg Z cm 2 ON,} 3 5 kg Z cm 2 or less It is better to set it as follows.

FIG. 9 shows an example in which the maximum opening degree of the indoor refrigerant flow control valves 202 and 302 is changed according to the intake air temperatures t206 and t306 of the respective indoor units.

When the suction air temperature exceeds 30, the maximum opening of the indoor refrigerant flow control valve is the maximum opening, and when the suction air temperature is 25 or less, the full opening X 0.5 is the maximum opening. When the suction air temperature exceeds 25 and is 30 t or less, the maximum opening is not changed.

By providing the maximum opening with hysteresis as in the present embodiment, hunting of the refrigeration cycle due to frequent changes in the opening of the indoor refrigerant flow control valve can be prevented.

Another embodiment of the method for controlling the indoor refrigerant flow regulating valve will be described with reference to FIGS. 1 and 1. FIG.

FIG. 10 is a plan view showing a component arrangement of a control board of a room controller of an indoor unit, and FIG. 11 is a relational diagram showing a combination of ONOFF of a dip switch of a control board and an operation coefficient.

The basic control method is the same as in Fig. 4, but how to find the cooling capacity

Cp · p

Q c 2 = a c 2 ·-a v 2 «V a 2-(t 2 06-t 2 0 7

SHF2

( 13 )

Cp

Q c 3 = a c 3 · —— ί ~!-^-«A v 3 * V a 3, t 3 06-t 3 0 7

SHF 3!

( 14 )

The temperature difference between the intake air temperature and the blown air temperature can be changed by the correction coefficients ac2 and ac3 and the indoor air volume coefficients aV2 and av3 as equations (13) and (14). I have.

In addition, the method for determining the heating capacity is expressed by Equation (15) and Equation (16).

Q h 2 = ah 2-C p. «P ₂ » av 2 »V a 2-(t 2 07-t 206)

(15)

Q h 3 = ah 3 «C p,-p ₃ « av 3-V a 3 »(t 3 0 7-t 3 0 6)

(16)

The temperature difference between the outlet air temperature and the inlet air temperature can be changed by the correction coefficients ah2 and ah3 and the indoor airflow coefficients av2 and av3. I'm trying.

With the above correction, the calculation of the room 內 functional force can be made more accurate, and the accurate control of the indoor refrigerant flow control valve and the compressor capacity can be realized.

Next, a method of changing the sensible heat ratio of the indoor unit 200, each correction coefficient, and the indoor air flow coefficient will be described.

In FIG. 10, dip switches 2 1 1 (D SW 1) 2 1 2 (D SW 2), 2 13 (DSW 3), and 2 14 (DSW 4) are mounted on the board. ing. One dip switch is composed of four ON / OFF switches, and each coefficient can be changed by a combination of the ON / OFF switches. Fig. 11 shows an example of changing the coefficient. The sensible heat ratio is changed based on the atmosphere in which the indoor units are installed, and the value for the general office is about 0.7. This value should be set low in places with high humidity, such as in kitchens, and high in places with low humidity, as in computer rooms.

The correction coefficient ac 2 is a correction coefficient for the temperature distribution of the cooling air outlet air temperature, and is set to 1.0 when the temperature detected by the temperature detector 207 is the average outlet air temperature, and is set higher than that. For temperature, set to a value greater than 1. Also, if the detected temperature is lower than the average blowing air temperature, set a value smaller than 1.

The correction coefficient ah 2 is a correction coefficient for the temperature distribution of the outlet air temperature of the heating, and is set to 1.0 when the temperature detected by the temperature detector 207 is the average outlet air temperature, and is set higher. When the temperature is detected, the value shall be less than 1. Also, if the detected temperature is lower than the average blowing air temperature, set a value greater than 1.

The indoor controller 208 needs a large storage capacity to store all the indoor unit capacity / room / model air volume. Therefore, only the representative air volume is stored and corrected by the indoor air volume coefficient a V 2. The indoor airflow coefficient shall be 1.0 if the actual airflow is the same as the stored representative airflow, a value less than 1 if it is less than the representative airflow, and a value greater than 1 if it is more.

Another embodiment of the present invention will be described with reference to FIGS. 12 and 13. <FIG. 12 is a multi-room air conditioner at the time of heating operation according to another embodiment of the present invention. Fig. 13 is a block diagram showing the configuration of the refrigeration cycle of Fig. 13. Fig. 13 shows the outdoor refrigerant flow control valve opening, the minimum refrigerant flow control valve opening, and the indoor refrigerant flow control valve opening of the stopped indoor unit. FIG. 4 is a graph showing the relationship of FIG.

FIG. 12 shows a refrigeration cycle when the indoor units 200 and 300 are in the heating operation, and the liquid tank 109 is installed on the gas pipe 121 side. The rest is the same as the refrigeration cycle in Fig. 1 already described.

During cooling, the inside of the liquid tank 109 is at a low pressure, and the refrigerant temperature becomes lower than the ambient temperature, so that the refrigerant does not condense and remain as a liquid refrigerant.

During heating, the refrigerant becomes high pressure and the refrigerant temperature becomes higher than the ambient temperature, so that the refrigerant condenses and becomes a liquid refrigerant, and accumulates in the liquid tank 109. This allows excess refrigerant during heating to be absorbed.

The pipe that guides the refrigerant into the liquid tank 109 rises up to the top of the liquid tank 109 so that even if the four-way valve is switched due to defrosting, etc., the liquid refrigerant always accumulates. It will not return to.

In FIG. 1, the indoor unit 200 is operated at the maximum capacity, the capacity of the indoor unit 300 is controlled, the indoor refrigerant flow regulating valve 302 is throttled, and the capacity is reduced. Therefore, a large amount of liquid coolant is accumulated in the indoor heat exchanger 301 of the indoor unit 300.

The opening degree of the outdoor refrigerant flow control valve 102 of the outdoor unit 100 is controlled such that the discharge temperature of the compressor 105 detected by the discharge temperature detector 115 becomes a set value. Here, the indoor refrigerant flow control valve 302 of the indoor unit 300 is excessively throttled. As a result, the liquid refrigerant excessively accumulates in the room heat exchanger 301, and the amount of refrigerant circulating in the refrigeration cycle decreases. Therefore, the flow rate of refrigerant in the indoor unit 200 decreases, and the heating capacity of the indoor unit 200 becomes insufficient.

When the amount of refrigerant circulating in the refrigeration cycle decreases, the compressor cannot be cooled, and the discharge temperature rises. Therefore, if the discharge temperature is controlled so as to be the set value, the opening degree of the outdoor refrigerant flow control valve 102 is increased as the discharge temperature increases. Therefore, as shown in Fig. 13,

(1) When the opening of the outdoor refrigerant flow control valve 102 is less than the predetermined opening A (0.5 X full opening), the minimum opening of the indoor refrigerant flow control valves 202 and 302 is (0.1 X full opening).

(2) When the opening of the outdoor refrigerant flow control valve 102 exceeds the predetermined opening B (0.8 X full opening), the minimum opening of the room / refrigerant flow control valve 202, 302 is large. (0.4 X full opening).

(3) When the opening of the outdoor refrigerant flow control valve 102 is between the predetermined opening A and the predetermined opening B, the minimum opening of the indoor refrigerant flow control valves 202 and 302 is as follows.

The value shall be in the range from (0.IX full opening) to (0.4X full opening) and proportional to the opening of the outdoor refrigerant flow control valve 102.

As a result, the minimum opening of the outdoor refrigerant flow regulating valves 202 and 302 is determined by the opening of the outdoor refrigerant flow regulating valve 102.

As described above, it is possible to prevent the liquid refrigerant from excessively collecting in the indoor heat exchanger 內.

Further, when the indoor unit 300 is stopped, the indoor refrigerant flow regulating valve 302 is set to a predetermined slightly-opened degree, but also at this time, similarly to the above, the indoor heat exchanger 3 A large amount of liquid refrigerant accumulates in the inside of the refrigeration cycle 01, and if this amount is too large, the amount of the refrigerant circulating in the refrigeration cycle decreases, and the heating capacity of the indoor unit 200 is insufficient. Stop room at the opening of the outdoor refrigerant flow control valve 102 The degree of opening of the indoor refrigerant flow control valve of the inner unit is changed.

In other words, as shown in FIG.

(1) When the opening of the outdoor refrigerant flow control valve 102 is smaller than the predetermined opening A (0.5 X full opening), the minimum of the refrigerant flow control valves 202, 302 of the stopped indoor unit The opening shall be (0.05 X full opening).

(2) When the opening of the outdoor refrigerant flow control valve 102 reaches the predetermined opening C (full opening), the minimum opening of the refrigerant flow control valves 202 and 302 of the indoor stop indoor unit is large. (0.1 X full opening).

(3) When the opening of the outdoor refrigerant flow control valve 102 is between the above-mentioned predetermined opening A and the predetermined opening C, the minimum of the indoor refrigerant flow control valves 202 and 302 of the indoor stop indoor unit The opening shall be from (0.05 X full opening) to (0.IX full opening) and a value proportional to the opening of the outdoor refrigerant flow control valve 102.

The minimum opening of the indoor refrigerant flow regulating valves 202 and 302 of the indoor / stop indoor unit is determined by the opening of the outdoor refrigerant flow regulating valve 102.

As described above, even when the indoor unit 300 is stopped, it is possible to prevent the liquid refrigerant from being excessively accumulated in the indoor heat exchanger.

According to the present invention, since the capacity of the compressor is controlled so that the capacity of the operated indoor unit becomes the required target capacity, the compressor is operated with power consumption corresponding to the required capacity of the indoor unit. A multi-room air conditioner with low power consumption during heating operation will be provided.

In addition, especially during the heating operation, the amount of refrigerant circulating in the refrigeration cycle is secured by changing the opening of the indoor refrigerant flow control valve of the indoor unit according to the opening of the outdoor refrigerant flow control valve, resulting in insufficient capacity. A multi-room air conditioner that prevents the occurrence of air pollution is provided.

Claims

The scope of the claims

1. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger, and an indoor unit equipped with an indoor heat exchanger, an indoor fan, and a means for detecting the intake air temperature and the blown air temperature are connected to the liquid piping and In a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Means for determining the cooling or heating capacity based on the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit;

Means for determining a target cooling or heating capacity based on a difference between the suction air temperature and a room temperature set value.

A multi-room air conditioner, comprising: controlling the operating capacity of the variable displacement compressor so that the total value of the cooling or heating capacity becomes the total value of the target cooling or heating capacity.

2. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger, and a plurality of indoor units equipped with an indoor heat exchanger, an indoor fan and means for detecting the intake air temperature and the blow-out air temperature are connected to the liquid piping and In a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Means for determining the cooling capacity based on the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit;

Means for determining a target cooling capacity based on a difference between the suction air temperature and a room temperature set value;

A multi-room air conditioner, wherein the operating capacity of the variable displacement compressor is controlled such that the total value of the cooling capacity becomes the total value of the target cooling capacity.

3. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger is connected to multiple indoor units equipped with an indoor heat exchanger, an indoor fan, and means for detecting the intake air temperature and the blown air temperature. Refrigeration cycle connected by gas piping In the multi-room air conditioner,

Means for determining a cooling capacity from a temperature difference between an intake air temperature and an outlet air temperature of the indoor unit, an air volume of the indoor unit, an air density, a specific heat of air, and a sensible heat ratio,

4. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger is connected to a plurality of indoor units equipped with an indoor heat exchanger, an indoor fan and means for detecting the intake air temperature and the blown air temperature. In a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Means for determining a heating capacity from a temperature difference between an intake air temperature and an outlet air temperature of the indoor unit, an air volume of the indoor unit, an air density, and a specific heat of air;

Means for determining a target heating capacity based on a difference between the suction air temperature and a room temperature set value;

A multi-room air conditioner, wherein the operating capacity of the variable displacement compressor is controlled so that the total value of the heating capacity becomes the total value of the target heating capacity.

5. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger is connected to a plurality of indoor units equipped with an indoor heat exchanger, an indoor fan, and means for detecting the intake air temperature and the outlet air temperature. In a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Cooled by the temperature difference between the intake air temperature and the air temperature of the indoor unit. Means to determine the capacity of the tuft,

When the difference between the suction air temperature and the room temperature set value is greater than 2 to 4 * C, the target cooling capacity is the rated cooling capacity of the indoor unit.When the difference is 2 to 4 or less, the target cooling capacity is Means to be set to be equal to or less than the rated cooling capacity of the indoor unit

6-An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger, and an indoor unit equipped with an indoor heat exchanger, an indoor fan, and a means for detecting the intake air temperature and the blown air temperature are connected with liquid piping and gas. In a multi-room air conditioner connected by piping to form a refrigeration cycle,

Means for determining the heating capacity based on the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit;

When the difference between the intake air temperature and the set room temperature is larger than 2 to 4, the target heating capacity is the rated heating capacity of the indoor unit, and when the difference is 2 to 4 ^ or less, the target heating capacity is Means to be set below the indoor unit's rated heating capacity and

7. The air conditioner according to claim 3, wherein the indoor unit is provided with a room-based refrigerant flow control valve, and the opening degree of the room-based refrigerant flow control valve is controlled such that the cooling capacity becomes the target cooling capacity. And a multi-room air conditioner.

8. The device according to claim 4, wherein the indoor unit includes an indoor refrigerant flow control valve, and the indoor refrigerant flow rate is adjusted so that the heating capacity becomes the target heating capacity. A multi-room air conditioner characterized by controlling the opening of a regulating valve.

9. An outdoor unit equipped with a variable displacement compressor and an outdoor heat exchanger, a plurality of units equipped with an indoor heat exchanger, an indoor fan, an indoor refrigerant flow control valve, and means for detecting the intake air temperature and the blow-out air temperature In a multi-room air conditioner in which indoor units are connected by liquid piping and gas piping to form a refrigeration cycle,

Means for controlling the operating capacity of the variable displacement compressor so that the total value of the heating capacity becomes the total value of the target heating capacity;

Means for controlling the opening degree of the indoor refrigerant flow control valve so that the heating capacity becomes the target heating capacity;

Means for making the maximum opening of the indoor refrigerant flow regulating valve smaller than the full opening when the discharge pressure of the variable displacement compressor is equal to or less than a predetermined value.

A multi-room air conditioner characterized by having:

10. An outdoor unit equipped with a variable-capacity pressure box machine and an outdoor heat exchanger, an indoor unit heat exchanger. Liquid units are connected to multiple indoor units equipped with an indoor unit fan and suction air temperature and outlet air temperature detection means. And a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Means for determining a target heating capacity based on a difference between the suction air temperature and a room temperature set value; Means for controlling the operating capacity of the variable displacement pressure machine so that the total value of the heating capacity becomes the total value of the target heating capacity;

A pressure switch which is turned off when the discharge pressure of the variable displacement compressor becomes 15 to 20 kg / cm ² or less;

A multi-room air conditioner (11. Variable displacement pressure) wherein the maximum opening of the indoor refrigerant flow control valve is set to (full opening X 0.5) when the pressure switch is turned off. An indoor heat exchanger is connected to an outdoor unit equipped with a box machine and an outdoor heat exchanger. A plurality of indoor units equipped with an indoor fan and means for detecting the intake air temperature and the blow-out air temperature are connected by liquid piping and gas piping. In a multi-room air conditioner with a refrigeration cycle,

Means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the density of air, and the specific heat of air;

Means for controlling the operating capacity of the variable capacity pressure box machine so that the total value of the heating capacity becomes the total value of the target heating capacity;

Means for reducing the maximum opening of the chamber / refrigerant flow control valve to less than the full opening when the suction air temperature is equal to or lower than a predetermined value;

A multi-room air conditioner characterized by having:

1 2. An outdoor unit equipped with a variable-capacity pressure box machine and an outdoor heat exchanger, and an indoor heat exchanger. An indoor fan and means for detecting the intake air temperature and the outlet air temperature In a multi-room air conditioner in which a refrigeration cycle is configured by connecting multiple air conditioners equipped with liquid piping and gas piping,

A multi-chamber air conditioner, wherein the maximum opening of the indoor coolant flow control valve is set to (full opening X 0.5) when the suction air temperature is 20 to 25 and the following. Machine.

13. The multi-room air according to any one of claims 1 to 3, wherein the cooling capacity is obtained by correcting the cooling capacity with a correction coefficient of a temperature distribution of a blown air temperature and an indoor air flow coefficient. Harmony machine.

14. The method according to any one of claims 1, 4, and 6, wherein the heating power is obtained by correcting the heating power with a correction coefficient of a temperature distribution of a blown air temperature and an indoor air flow coefficient. Room air conditioner.

15. An outdoor unit equipped with a variable capacity compressor and an outdoor heat exchanger is connected to a plurality of indoor units equipped with an indoor heat exchanger, an indoor fan, and means for detecting the intake air temperature and the outlet air temperature. In a multi-room air conditioner connected by gas piping to form a refrigeration cycle,

Means for determining the heating capacity from the temperature difference between the intake air temperature and the blow-out air temperature of the indoor unit, the air volume of the indoor unit, the density of air, and the specific heat of air When,

A multi-room air conditioner, comprising: during a heating operation, changing an opening of an indoor refrigerant flow control valve of the indoor unit according to an opening of an outdoor refrigerant flow control valve.

1 6. In the method according to claim 15,

When the opening degree of the outdoor refrigerant flow regulating valve is equal to or less than (0.5 X full opening degree), the minimum opening degree of the indoor refrigerant flow regulating valve is set to (0.IX full opening degree), and the outdoor refrigerant flow adjustment is performed. When the opening degree of the valve is equal to or more than (0.8 X full opening degree). The minimum opening degree of the indoor refrigerant flow regulating valve is set to (0.4 X full opening degree), and the opening of the outdoor refrigerant flow regulating valve is performed. When the degree is between (0.5 X full opening) and (0.8 X full opening), the minimum opening of the indoor refrigerant flow regulating valve is set to (0.4 X full opening) from (0.4 X full opening). The multi-room air conditioner is characterized in that a value up to the full opening degree is proportional to the opening degree of the outdoor refrigerant flow control valve.