JP3447317B2 - Air conditioning equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning equipment for controlling the air blowing capacity of an air conditioner according to a status signal of a variable air volume device.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Publication No. 60-47497, for example, when a single air conditioner is used to supply air to a plurality of air conditioning zones, they are connected to each air conditioning zone. Variable air volume (VA)
It is known that V) is provided and optimum control is performed according to the air conditioning load of each air conditioning zone by individually controlling each variable air volume device. In the case of this conventional air conditioning equipment, among the plurality of variable air flow rate devices, at least one variable air flow rate device has the throttle valve in the maximum open state, and the required air flow rate and the actual passing air flow rate are equalized so that the inverter and the inlet are provided. By changing the control output to the capacity control means such as the vane step by step, the air blowing capacity is changed little by little to obtain the desired air conditioning state. Such a control method is called floating control or cascade control and has a problem that it takes a long time to complete the control, but the control is extremely accurate and hunting of the air blowing capacity is avoided.

Further, in an air conditioner equipped with a variable air volume control device similar to that described above, the throttle valve of the variable air flow volume control device does not change substantially from the maximum open state (100% opening) to the permitted throttle state. There is also known a device that controls the blowing capacity by floating control so that the throttle valve is in the range.

[0004]

The air conditioning equipment using the above-mentioned variable air flow rate device is characterized in that it is possible to individually control only the air conditioning zone in use. That is,
Optimal air conditioning control can be performed for each air conditioning zone while using one air conditioner. So, for example, in an office building, when business hours are over,
It is not uncommon to turn off the air conditioning in the majority of the rooms other than the one with overtime workers.

In such a case, since the variable air volume devices in the room where the air conditioning is stopped are all closed at once by the throttle valve, it is necessary to reduce the air blowing capacity of the air conditioner. Since the above-mentioned floating control is performed, the air blowing capacity is changed to a lower value by slow control. For this reason, the closing speed of the throttle valve of each variable air volume device cannot be followed at all, and the blower capacity may temporarily become excessive, the pressure in the duct may rise, and abnormal noise may occur. For example, while the throttle valve closes in about 45 to 60 seconds, it may take 7 to 8 minutes for the air volume of a floating-controlled air conditioner to reach near the target value. The above abnormal noise may continue.

Conventionally, as a means for preventing the above-mentioned abnormal noise, even if a plurality of variable air volume devices are turned off in order to prevent the plurality of variable air volume devices from being in the throttle valve closed state at the same time, By making a sequence control circuit that allows the closing time of the variable air volume device to shift slightly,
Although it was tried to prevent the pressure in the duct from rising, this measure was not versatile because it could not change the pattern of stopping the air conditioning.

FIG. 5 is a general static pressure-air volume characteristic diagram of a blower. Here, as in the procedure of the air conditioning control described above, when the rotational speed of the blower gradually decreases after the throttle valve of the variable air volume device is first closed, the air volume and the static pressure are the points a to b in FIG.
It will move from point to point c. Therefore, excess pressure is generated in the air duct by the difference between points b and c. When the change in air volume due to the blower is small, the excess pressure is also relatively small, so that abnormal noise is not generated from the variable air volume device. However, when the amount of air volume change is large as shown in c ′ of FIG. The pressure also increases and abnormal noise is generated from the variable air volume device, which is a serious problem for air conditioning equipment.

As a characteristic of the blower, it is well known that when the device resistance curve is constant, the air volume is proportional to the rotation speed of the blower and the static pressure is proportional to the square of the rotation speed, and the capacity control means It is also well known that when an inverter or the like is used, the control output of the blower capacity control device is proportional to the rotation speed of the blower. Theoretically, when the air volume change of the variable air volume device and the air volume change due to the blower capacity control are equal, the air volume and the static pressure change along the device resistance curve as shown by the broken line arrow F in FIG. The actual device resistance curve varies depending on the difference in duct work and the position where the air volume changes, so
c ′ is not a fixed point, but an indefinite point with variations that cannot be predicted in advance. For this reason, even if the rotation speed of the blower is controlled in proportion to the amount of change in the air flow, the optimum air blow capacity is not necessarily obtained.

Although the case where the air volume decreases has been described above, the same can be said for the case where the air volume increases. For example, during the daytime, only some employees are seated, so only some rooms are air-conditioned, but in preparation for many employees returning to work in the evening, the air-conditioning that had been stopped until then was large. When restarting the air conditioning of a part of the room, the throttle valve of each variable air volume device will be fully opened as the air conditioning of each room is restarted. I was driving in 100
Must be increased to%.

In such a case, the throttle valves of the variable air volume device are opened all at once, but the blower of the air conditioner itself is controlled by the floating control so as to slowly increase the air volume, so that the room where air conditioning is restarted is restarted. Not only that, the air supply amount becomes insufficient to the room where the air conditioning is appropriately performed, and it takes 5 to 10 minutes to reach the predetermined air supply amount. For these reasons, in reality, it was not possible to restart air conditioning in too many air conditioning zones at once. That is, slow control such as floating control has a problem that it cannot follow abrupt changes.

The second problem is resonance. When the blower is controlled by the capacity control means such as an inverter that controls the rotation speed, some air conditioners may resonate at a specific rotation speed. Therefore, when resonance may occur, it may be possible to operate the capacity control means by giving a control output considering the jumping range so as to avoid a specific resonance speed. Is merely trying to set the jumping area in the capacity control means such as an inverter. However, since the inverter or the like is a general-purpose control means and is not designed in consideration of the capacity control characteristics of the air conditioning equipment, there are the following problems.

In order to prevent resonance by an inverter or the like, as shown in FIG.
When the control input reaches b, the control output is held at the value of β until the control input becomes smaller than b. When the capacity is increased, when the control input reaches b, the control output is held at the value of α until the control input reaches a. To do. For example, when the air-conditioning load requires a blowing capacity corresponding to point A, the control output β is too large for the control output β, the control input decreases from a to b, and the control output decreases to α. However, the control output α is insufficient in blowing capacity, so the control input increases from b to a and the control output increases to β.

Therefore, when the jumping control described above is combined with the floating control, for example, in the case of a mode in which the air volume is reduced, the control output is originally fixed to β in the jumping range, which means that the blower capacity is excessive. Therefore, the blower capacity control device operates to lower the control output. However, at this time, the indoor air supply air volume is regulated by the variable air volume device, and the indoor temperature condition is kept appropriate.

Moreover, the pressure in the terminal duct is not so great as to cause abnormal noise. Nevertheless, the control output drops to α, and due to the difference in control speed, the control output drops to α or less, so that the blowing capacity becomes too small. In this way, the control output rises after the indoor temperature is adversely affected. However, since the control output is fixed to α this time, the control output rises without recovering the room temperature, and even when β is reached, that state is not immediately recovered and the control output continues to rise.

As described above, the control state continues to be hunted, and it cannot be effectively used in practice. As described above, in the combination of the resonance prevention jumping control and the floating control by the conventional control method, hunting may occur, and stable capacity control operation of the blower may not be possible.

Therefore, the first object of the present invention is to rapidly follow a large air volume change so that the individual control, which is one of the greatest features of the air conditioning equipment using the variable air volume apparatus, can be maximally utilized, and an abnormality can be detected. It is to be able to perform the optimum air volume control without noise. Further, a second object is to avoid the resonance of the air conditioner caused by the control of the blower capacity, and to enable the stable control of the blower capacity without deteriorating the room temperature controllability.

[0017]

The first aspect of the present invention, which has been developed to achieve the above first object, uses a single air conditioner whose operation is controlled by a blower capacity control device, and a blower duct and In the air conditioning equipment that supplies air to multiple air conditioning zones via multiple branch ducts,

A variable air volume device is arranged in each of the branch ducts, and each variable air volume device drives an air volume detector, a throttle valve, an opening degree detecting means for detecting the opening degree of the throttle valve, and a throttle valve. An actuator and a control unit that controls the opening degree of the throttle valve according to the required air volume of the air conditioning zone,

In the air blowing capacity control device, the sum ΣQ ₁ of the required air volumes of all the variable air volume devices at a certain time point changes with respect to the total sum ΣQ ₀ of the required air volumes of all the variable air volume devices at the previous time point. Or asking for the degree of change,

When the degree of the above-mentioned change is within a certain reference value, the required air flow rate and the actual air flow rate are set in a state where the position of the throttle valve of at least one variable air flow device is substantially close to the minimum pressure loss. Or the position of the throttle valve is changed from the maximum opening state to within the allowable throttle range, the control output to the air conditioner is changed step by step and relatively slowly, and the floating control is executed. ,

Further, when the degree of the change exceeds a certain reference value, the air blowing capacity control device responds to the increase / decrease of the new sum total ΣQ ₁ of the required air volumes with respect to the previous total sum ΣQ ₀ of the required air volumes. The floating so that it becomes the amount of change
It is characterized in that the control is changed to a proportional control proportional to the amount of change in the air flow rate to promptly complete the change of the blower capacity by the air conditioner, and then the floating control is performed.

A second aspect of the present invention for attaining the second object is, in addition to the first aspect of the present invention, an apparatus for controlling the blowing capacity by controlling the rotational speed of an inverter or the like.
When the new control output to be changed enters the jumping range where resonance of the air conditioner should be avoided, the blower capacity control device replaces this new control output with the minimum control output that exceeds the jumping range. When it is sent to the air conditioner, and when the change of the air blowing capacity is further requested next, it is determined whether or not the new control output I ₁ to be changed goes out of the jumping area before the jumping area. The feature is that the determination is performed based on the control output I ₀ of the old data and the total sum ΣQ ₀ of the required air flow rates.

[0023]

By using the blower volume control device of the present invention,
When a large change in air flow occurs, control is performed to increase or decrease the air flow in a so-called quick mode, and a large change in air flow corresponding to the difference in air flow is immediately made by the air conditioner, and then fine control is performed in the floating mode. As a result, the target state is accurately reached in a short time. Therefore, even if a large reduction in air volume is required, it is possible to prevent the rise in pressure in the duct and the occurrence of abnormal noise due to it, and when a large increase in air volume is required, it is caused by the shortage of air volume in all air conditioning zones. Deterioration of room temperature controllability can be prevented, an increase in air conditioning load can be dealt with promptly, and the air conditioning zone in which air conditioning is newly started can be quickly started up.

In the second aspect of the present invention, when the control output is predicted to fall within the jumping range, the control output is set to β
By changing the blast capacity to the next value, the old data at that time, which is the old data, and the sum of the required air flow (the data before entering the jumping area), which is the old data at that time, are stored as they are. At times, it is determined based on the old data whether or not the new control output enters the jumping area. Thus, only when you really get out of the jumping area,
Since the control output is shifted from β to the normal control output value, there is no room temperature deterioration due to hunting. In this way, by determining whether the control output goes out of the jumping range, and by keeping the control output at β when the control output is within the jumping range, both when the control output rises and when it falls, Stable control can be performed without hunting.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows the air conditioning equipment 10 of this embodiment.
An outline of the overall configuration of is shown. The air conditioning equipment 10 includes a single air conditioner 12 whose operation is controlled by a blower capacity control device 11. The air conditioner 12 includes a blower 14 that is rotationally driven by a motor 13, and a heat exchanger 1
5 and capacity control means 16 such as an inverter.
The air conditioner 12 is connected via a blower duct 17 and a plurality of branch ducts 18 so as to be able to supply air to a plurality of air conditioning zones 20 such as the interior of a building.

In each air conditioning zone 20, a room thermostat 21 for detecting the room temperature and setting the room temperature is provided as an example of an air volume setting device. Further, each branch duct 18 is provided with a variable air volume device (VAV) 25. The schematic configuration of the variable air volume device 25 is as shown in FIG.
An air flow detector 26 that detects the amount of passing air, a throttle valve 27 that controls the amount of passing air, an actuator 28 that drives the throttle valve 27, and a fully open detector 30 and a fully closed valve as an example of an opening detection unit of the throttle valve 27. The detector 31 and the control unit 32 that controls the control are provided.

The variable air volume device 25 receives an electric signal from the room thermostat 21 to individually determine the required air volume corresponding to the air conditioning load of the air conditioning zone 20, and adjust the opening degree of the built-in throttle valve 27. The amount of air supplied to the air conditioning zone 20 is controlled by. The room thermostat 21 arranged in the air conditioning zone 20 transmits the detected temperature and the room temperature set value to the variable air volume device 25.

The blower capacity control device 11 includes an air conditioner 12
Is arranged in the vicinity of. Each variable air volume device 25 transmits a respective status signal to the air blowing capacity control device 11. Then, the air blowing capacity control device 11 uses the variable air volume devices 25.
The control signal necessary for controlling the blowing capacity is transmitted to the capacity control means 16 of the air conditioner 12, as will be described later. The capacity control unit 16 controls the air volume of the air conditioner 12 by an inverter or the like that controls the rotation speed of the motor 13 that drives the blower 14.

Generally, each air conditioning zone 20 has a different size and a different air conditioning load. Therefore, each variable air volume device 25 has various sizes according to the designed air conditioning load for each air conditioning zone 20. Different size (capacity) is installed.

The control unit 32 of the variable air volume device 25 compares the detected temperature of the room thermostat 21 with the room temperature set value, and determines the air supply volume to the air conditioning zone 20 in which the room thermostat 21 is installed. Then, this required air volume (set air volume) is compared with the actual passing air volume (detected air volume) detected by the air volume detector 26, and if the detected air volume is larger than the required air volume, the throttle valve 27 is used to reduce the supply air volume.
When the detected air volume is smaller than the required air volume, the throttle valve 27 is opened so as to increase the supply air volume, so that the detected air volume and the required air volume are finally controlled to be equal. Then, the required air flow rate, the detected air flow rate, and the fully open or fully closed signal of the throttle valve 27 are transmitted from the control units 32 of all the variable air flow rate devices 25 to the air blowing capacity control device 11.

The blower capacity control device 11 calculates the sum total of the air volumes required for the variable air volume devices 25 (required air volume) and the total air volume detected by the variable air volume devices 25, and stores the calculation results. The following determination is made in the procedure of the flowchart shown in FIG. That is, as shown by the chain double-dashed line in FIG. 5, when the amount of change in the air volume from point a is large, the speed of the blower is controlled in proportion to the amount of change in the air volume by the quick mode, and the approximate point c ′ is obtained. By controlling to the vicinity and then shifting to the floating control, the optimum operating point c'is controlled.

The range in which abnormal noise does not occur due to excess pressure depends on the size of the blower and the operating point,
Change in the control output (4 to 20 mA) of the blower capacity control device 11 exceeds the range of 1 to 3 mA.
It has been experimentally confirmed that abnormal noise is likely to occur at the time of. In this embodiment, in order to cope with a large-scale air conditioning system with a large amount of air blow, the air blowing capacity control device 1
When the change in the control output of No. 1 is larger than 1 mA, it is determined that the change in air volume is large.

On the other hand, the resonance range of the blower 14 is a range of 2 to 3 Hz at the output of the inverter, and the above-mentioned change in control output is 1 m.
A is an inverter output of 3.125 in the 50 Hz area.
Since it corresponds to Hz, no abnormal noise is generated by the resonance prevention operation.

Next, the operation of the blower capacity control device 11 will be described with reference to the flowchart of FIG. First, in the first step S1, in order to determine whether or not the change in the required air volume is large, that is, whether or not it is necessary to urgently perform the air blowing capacity control, the following equation is used to calculate the total sum ΣQ ₀ of the previous required air volumes. Then, the ratio of the difference between the new sum ΣQ ₁ of the required air volumes is calculated, and it is determined whether or not the control output change proportional to the difference is 1 mA or more. | (ΣQ ₀ −ΣQ ₁ ) ÷ ΣQ ₀ | × I ₀ ≦ 1 (mA)

ΣQ ₀ : Sum of previous required air volumes (CMM,
Or CMH) ΣQ ₁ : New sum of required air volume (CMM or CM)
H) I ₀ : Previous control output (4 to 20 mA) I ₁ : New control output (4 to 20 mA)

If the determination in the first step S1 is YES, it means that there is not such a large change in the air volume.
The process proceeds to the second step S2 and subsequent steps, and shifts to floating control. In the second step S2, the throttle valve 2 of at least one variable air volume device 25 among the variable air volume devices 25 described above.
It is determined whether 7 is fully open. The term "fully open" as used herein does not mean that the throttle valve 27 is in a horizontal state, but in short means a state in which the throttle valve 27 is in the maximum open state and the pressure loss is the smallest when the wind passes through the inside of the variable air volume device 25.

When the determination in the second step S2 is NO, it means that there is no variable air volume device 25 in the maximum open state. That is, in this case, it means that the air conditioner 12 is in the excessive air blowing state because all the variable air volume devices 25 in the air-conditioning state set the throttle valve 27 to the throttle control state in order to pass the required air volume. Therefore, in this case, when the control output is lowered in the fifth step S5, it is determined whether the control output falls within the resonance range, that is, the jumping range.

If the determination in the second step S2 is YES, it is determined in the third step S3 whether or not the required air volume is greater than the actual air volume (detected air volume) for the variable air volume device 25 with the throttle valve 27 fully opened. If the determination in the third step S3 is YES, it means that the detected air volume is smaller than the required air volume even in the maximum opening state, that is, the air blowing capacity is insufficient, so the control output is increased in the sixth step S6. When the control output is made, it is determined whether or not the control output enters the resonance range, that is, the jumping range.

When the determination in the third step S3 is NO, in the fourth step S4, it is determined whether or not the required air volume and the detected air volume are the same for the variable air volume device 25 in the maximum open state. The determination in the fourth step S4 is YE
In the case of S, the required air volume and the detected air volume are equal in the maximum opening state, which means the optimum air blowing state, and therefore the control output is held as it is.

If the determination in the fourth step S4 is NO, it means that the detected air volume is excessive with respect to the required air volume in the maximum open state, and therefore the determination of the fifth step S5 is performed. If the determination in the fifth step S5 is YES, the control output to be lowered is in the resonance range, that is, in the jumping range. Therefore, in order to avoid resonance, the control output of the jumping range upper limit (output β in FIG. 4) is set. To do.

If the determination in the fifth step S5 is NO, the control output to be lowered is not in the resonance range,
The control output is lowered by one step (1/256, for example), and ΣQ ₀ is replaced with the value of ΣQ ₁ in preparation for the next time, and I ₀ is replaced with the value of I ₁ to store the data.

If the determination in the sixth step S6 is YES, the control output to be increased is in the resonance range, that is, in the jumping range. Therefore, in order to avoid resonance, the control output at the upper limit of the jumping range (output β in FIG. 4). ).

If the determination in the sixth step S6 is NO, the control output to be increased is not in the resonance range,
The control output is increased by one step (for example, 1/256), ΣQ ₀ is set to the value of ΣQ ₁ , and I _{0 is set} to I ₁ in preparation for the next time.
Change the value of to save the data.

If the determination in the first step S1 is NO, the change in the required air volume is large and it is necessary to promptly change the control output to match the sum of the required air volumes. Therefore, the 7th
In step S7, it is determined whether or not the control output to increase / decrease in proportion to the total required air volume is in the jumping area. In the embodiment, I ₀ − {(ΣQ ₀ −ΣQ ₁ ) ÷ Σ
Is Q ₀ } × I ₀ in the jumping area? Is determined.

If the determination in the seventh step S7 is YES, the control output to be changed falls within the jumping range, so the control output is set to the upper limit of the jumping range, that is, the control output of β in FIG.

The above-mentioned fifth, sixth and seventh steps S5, S
In S6 and S7, when the control output to be changed is in the jumping area, the sum ΣQ ₀ of the requested air volumes for the previous time and the control output I ₀ at that time are saved as the old data, and ΣQ ₁ enters the jumping area. And the data of I ₁ are discarded.
Then, when the air volume changes next, the above-mentioned pre-jumping data ΣQ ₀ , I ₀ is used to determine whether or not the control output to be changed is in the jumping range.

If the determination in the seventh step S7 is NO, the control output to be changed is not in the jumping range, so a new control output I ₁ is determined by the following equation. I ₁ = I ₀ − {(ΣQ ₀ −ΣQ ₁ ) ÷ ΣQ ₀ } × I ₀ At this time, the value of ΣQ ₁ is input to ΣQ ₀ in preparation for the next time, and I ₀
Save the data by putting the value of I ₁ in.

As described above, when it is expected to enter the jumping area, the control output is fixed to β, and the data to be compared when the air volume change is requested next is the data before entering the jumping area. By using, the control output is kept at β until it is confirmed that the control output really goes out of the jumping range due to a change in the air conditioning load, so that hunting as in the conventional case (FIG. 6) occurs. And no deterioration in room temperature occurs. Further, even if the required air volume of the variable air volume device is drastically changed due to a large air-conditioning load change, it is possible to perform the optimum air blowing capacity control by swift tracking and fine control while avoiding the resonance range.

[0049]

According to the first aspect of the present invention, the sum total of the required air volumes of the variable air volume devices at a certain point in time is compared with the sum total of the required air volumes of the variable air volume units at the next point in time, and the difference is the set value. If it exceeds, the control is immediately proportional to the difference in air volume, that is, control proportional to the change in air volume.
Was carried out, after that, to achieve fine control of the final target value goes to the floating control, even if the increase in demand air amount is large, without become supply air shortage in all air-conditioning zone, Individual air conditioning can be easily performed only in the room where it is used, and energy can be saved. Further, when the required air flow rate is greatly reduced, it is possible to suppress a temporary increase in the pressure in the duct, prevent abnormal noise from occurring, and quickly control the air blowing capacity. For this reason, a special sequence control circuit tailored to the site is not required, control can be completed in a short time even if there is a large change in the blowing capacity, and stable blowing that does not change at room temperature even when there is a large load change. The capacity can be controlled.

According to the second aspect of the present invention, when driving while avoiding the resonance range, hunting is prevented by setting the control output at the upper limit of the resonance range, and jumping for preventing resonance is combined with floating control. Even if combined, stable capacity control operation of the blower can be performed without hunting. Further, since the control output value does not become too small at the time of jumping, it is possible to prevent a shortage of air supply to the room and prevent a problem that the room temperature control itself deteriorates.

[Brief description of drawings]

FIG. 1 is a control flowchart of an air conditioning facility showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the entire air conditioning equipment showing an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a variable air volume device in the air conditioning equipment shown in FIG.

FIG. 4 is a diagram showing a relationship between an input and a control output of the air conditioning equipment according to the embodiment of the present invention.

FIG. 5 is a static pressure-air flow characteristic diagram showing a relationship between a change in air flow and static pressure.

FIG. 6 is a diagram showing a relationship between an input and a control output in the conventional air conditioning equipment.

[Explanation of symbols]

10 ... Air conditioning equipment, 11 ... Blower capacity control device, 12 ...
Air conditioner, 16 ... Capacity control means, 17 ... Fan duct,
18 ... Branch duct, 20 ... Air conditioning zone, 25 ... Variable air volume device, 26 ... Air volume detector, 27 ... Throttle valve, 30 ... Fully open detector.

Continuation of the front page (56) Reference JP-A-61-130747 (JP, A) JP-A-4-270851 (JP, A) JP-A-2-57853 (JP, A) JP-A-4-208350 (JP , A) JP 63-6334 (JP, A) JP 63-223396 (JP, A) JP 60-47497 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) F24F 11/04

Claims (2)

(57) [Claims] 1. An air conditioning apparatus for supplying air to a plurality of air conditioning zones via a blower duct and a plurality of branch ducts by using one air conditioner whose operation is controlled by a blower capacity controller. A variable air volume device is provided in each of the ducts, and each variable air volume device includes an air volume detector, a throttle valve, an opening degree detection unit that detects the opening degree of the throttle valve, an actuator that drives the throttle valve, and an air conditioner. And a control unit that controls the opening of the throttle valve according to the required air volume of the zone, and the air blowing capacity control device is such that the sum ΣQ ₁ of the required air volumes of all the variable air volume devices at a certain time point is the previous time point. with obtaining the degree of how much changed or the change to the request airflow sum [sum] Q ₀ of all of the variable air volume system for, when the degree of the change is within the following predetermined reference value is less Also, the required air flow rate and the actual passing air flow rate become equal when the position of the throttle valve of one variable air flow device is substantially close to the minimum pressure loss, or the position of the throttle valve falls from the maximum open state to the allowable throttle range. Floating control is performed in which the control output to the air conditioner is changed step by step and relatively slowly, and the air blowing capacity control device has a degree of change exceeding a certain reference value. In this case, the sum of the previous required air volume ΣQ
_The air volume is changed from the floating control so that the amount of change according to the increase / decrease in the total sum ΣQ ₁ of the new required air volume with respect to ₀ becomes
An air conditioning apparatus characterized by changing to proportional control proportional to the amount of change to promptly complete the change of the blowing capacity by the air conditioner, and then transitioning to the floating control. 2. When the new control output to be changed falls within a jumping range where resonance of the air conditioner is to be avoided, the blower capacity control device replaces the new control output with a minimum value exceeding the jumping range. The control output of the limit is sent to the air conditioner, and when the change of the air blowing capacity is requested next, it is determined whether or not the new control output I ₁ to be changed is out of the jumping range. The air conditioning equipment according to claim 1, wherein the determination is made based on the control output I ₀ of the old data before entering the jumping area and the total sum ΣQ ₀ of the required air volumes.