JPH0439560A - Air conditioner - Google Patents

Abstract

PURPOSE:To improve an efficiency of utilization of a heat accumulation tank by a method wherein each of an opening or closing operation of each of dampers, the number of revolution of a blower and a cold water temperature at an outlet port for cold water is controlled to be kept at respective target value. CONSTITUTION:A control device 17 is operated such that an opening or closing operation of each of dampers 3a to 3d is controlled in such a way a room temperature of each of air conditioned regions 1a to 1d is detected by sensors 2a to 2d and the room temperature is kept at its target value. A pressure in an air supplying duct 4 is detected by a pressure sensor 7. The number of revolution of a blower 5 is controlled through a gear reducer 6 so as to keep the pressure at its target value, a cold water temperature at an outlet port of a cold water coil 12 is detected by a sensor 16 and a cold water control valve 11 is controlled in such a way as the temperature is kept at its target value. With such an arrangement, a temperature of the returning water from the air conditioner to a heat accumulation tank can be stabled and an efficiency of utilization of the heat accumulating tank can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner, and more particularly to an automatically controlled air conditioner used in a building or the like.

[Conventional technology]

FIG. 3 is a schematic configuration diagram of a conventional air conditioner. In a conventional device of this type, the room temperature of each air conditioning section (la to ld) is detected by a room temperature sensor (2a to 2d), and each damper (3a to
~3d) are controlled respectively. For example, when compartment 1a is hot during cooling, cold air is sent indoors by opening damper 3a in proportion to the input signal of sensor 2a, and conversely, when compartment 1a is too cool, it is proportional to the input signal from sensor 2a. Control was performed to suppress the supply of cold air by closing the damper 3a. The damper has been controlled proportionally to the room temperature and the damper opening, or proportionally to the room temperature and the wind speed using a wind speed sensor attached to the damper.

On the other hand, the supply air supplied from each damper into each compartment is proportionally controlled by the supply air temperature and the opening degree of the cold/hot water control valve using the supply air temperature sensor 10, the cold/hot water control valve 11, and the controller 9. In addition, the supply air pressure sensor 7, the transmission 6, and the controller 8 are used to proportionally control the supply air pressure and the rotational speed of the supply air blower to maintain the temperature and pressure near predetermined values. was.

In the conventional device configured in this way, the temperature of the cold/hot water at the outlet of the cold/hot water coil is determined using the air volume and supply air temperature as parameters, as shown in Figure 4, to explain an example during cooling. , and was forced to fluctuate.

However, such air conditioners that generally use water are often used in heating and cooling systems that use heat storage tanks.
The cold and hot water that exits the air conditioner is directly returned to the heat storage tank, so in order to increase the utilization efficiency of the heat storage tank, the temperature of the cold and hot water at the air conditioner outlet, that is, the cold and hot water coil outlet, should be as high as possible during cooling, and when heating Sometimes it is necessary to keep it as low as possible.

However, conventional methods cannot do this, resulting in low utilization efficiency of the heat storage tank and waste of thermal energy.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner that can solve the above-mentioned drawbacks, stabilize the temperature of water returned to the heat storage tank as much as possible, and improve the utilization efficiency of the heat storage tank.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a variable rotation speed air supply blower for supplying conditioned air through an air supply duct into a room divided into a plurality of air conditioning sections, and a cold/hot water coil. , a cold and hot water control valve, and a control device that controls the rotation speed of the air supply blower, the cold and hot water control valve, and a plurality of dampers that adjust the amount of air injected into each air conditioning section. In the air conditioner, the control device includes a means for controlling the opening and closing operations of each damper to maintain the room temperature of each air conditioning compartment at a target value, and a means for controlling the rotation speed of the air supply blower.
The pressure in the supply air duct is controlled to be maintained at a variable target value only when the damper is fully open, and the cold/hot water control valve is controlled to maintain the cold/hot water temperature at the cold/hot water coil outlet at a variable target value that can be set only when the supply air blower is at maximum rotation speed. The air conditioner is characterized by having means for controlling the air conditioner to maintain the same value.

The above-mentioned control device is equipped with a calculation means that compares the temperature population signal of each air-conditioning section with the set temperature of each air-conditioning section and calculates the operation amount of each damper that adjusts the amount of air injected into each air-conditioning section. , at least one of the operation values of each damper is a value in the opening direction, and at least one or more of the dampers corresponding to the value in the opening direction is fully open. at least one of the operation amounts of each damper obtained by the calculation means is a value in the opening direction, and When at least one of the dampers corresponding to the value of is fully open and the rotation speed of the supply air blower is at the upper limit of the control range, the cold and hot water coil outlet means for changing the target setting value of the cold/hot water temperature outside the standard value, and if there is no value in the opening direction among the operating amounts of each damper obtained by the calculation means, and at least one or more is in the closing direction. value, and at least one of the dampers corresponding to the value in the closing direction is fully open, and the target set value of the cold/hot water temperature at the cold/hot water coil outlet is in the direction of increasing the opening degree of the cold/hot water control valve. When the target setting value of the cold/hot water temperature at the cold/hot water coil outlet is changed, the target set value of the cold/hot water temperature at the cold/hot water coil outlet is changed in a direction approaching the reference value, and the operation amount of each damper obtained by the calculation means includes a change in the opening direction. There is no value, at least one value is in the closing direction, and at least one side of the damper corresponding to the value in the closing direction is fully open, and the target set value of the cold/hot water temperature at the cold/hot water coil outlet is When the rotational speed of the supply air blower is not at the lower limit of the control range, the target set value of the pressure in the supply air duct is lowered.

In addition, in the above-mentioned means, when a means for changing the target set value of the pressure in the air supply duct or the target set value of the cold/hot water temperature at the cold/hot water coil outlet is used, the operation amount of each damper is corrected. It is equipped with a correction calculation means and a means for operating each damper with an operation amount equal to the value calculated by the correction calculation means, and has a means for operating each damper with an operation amount equal to the value calculated by the correction calculation means, and a target setting value of the pressure in the air supply duct or a target temperature of cold and hot water at the outlet of the cold and hot water coil. If a means to change the set value is not used, each damper is operated with a manipulated variable equal to the calculated value of the manipulated variable of each damper, which is calculated in advance by comparing the temperature input signal of the winter air-conditioning section and the set temperature of each air-conditioning section. The system is designed to have a means for operating the system.

[For production]

In the air conditioner of the present invention, by using the control device as described above, the opening/closing operation of each damper is controlled to maintain the room temperature of each air conditioning compartment at the target value, and the rotation speed of the supply air blower is controlled. The pressure inside the air duct is controlled to be maintained at a variable target value only when the damper is fully open, and the cold/hot water control valve is
By controlling the cold/hot water temperature at the cold/hot water outlet to a variable target value that can be set only when the supply air blower rotation speed is at its maximum, the power consumption of the supply air blower can be reduced without compromising the comfort of the air conditioning compartment, and the air By keeping the temperature of the water returned from the conditioner to the heat storage tank as stable as possible, we were able to increase the utilization efficiency of the heat storage tank.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to the drawings, but the present invention is not limited thereto.

Embodiment 1 FIG. 1 is a schematic configuration diagram of an air conditioner of the present invention, and FIG. 2 is a flowchart of the control shown in FIG. 1.

In FIG. 1, an air supply with a variable rotation speed is used to supply air (supply air) adjusted for air conditioning through an air supply duct 4 into a room divided into a plurality of air conditioning sections 1a to 1d. A blower 5, a hot and cold water coil 12 that cools and heats the air,
It is equipped with a cold and hot water control valve 11 that adjusts the flow rate of cold and hot water flowing through the cold and hot water coil, and also controls the rotation speed of the air supply blower 5, controls the cold and hot water control valve 11, and supplies water to each air conditioning section 1a to 1d. This air conditioner includes a control device 17 that controls a plurality of dampers 3a to 3d that adjust the amount of air injected from an air duct.

The control device 17 controls the opening/closing operation of each damper 3a to 3d, and controls the room temperature of each air conditioning section 1a to 1d using sensors 2a to 2.
d, and control the room temperature to keep it at the target value.
The pressure inside the air supply duct 4 is detected by the sensor 7, and the rotation speed of the air supply blower 50 is controlled via the transmission 6 so as to maintain the pressure at the target value, and the temperature of the cold and hot water at the outlet of the cold and hot water coil 12 is controlled. The temperature is detected by a sensor 16, and the cold/hot water control valve 11 is controlled to maintain the temperature at a target value.

In addition, the control mechanism of the control device 17 compares the input signals from the temperature sensors 2a to 2d of each air conditioning section 1a to 1d with the set temperature of each air conditioning section 1a to 1d, and sends the input signal to each air conditioning section 18 to 1d. Dampers 3a to 3d adjust the amount of air injected into the
It is equipped with calculation means for calculating the manipulated variable.

Then, with the value obtained by the calculation means, each damper 3a to 3
When at least one of the manipulated variables d has a value in the opening direction, and at least one or more of the dampers corresponding to the value in the opening direction is fully open (for example, when dampers 3a and 3b have a value in the opening direction (If the damper 3b is fully open), it is equipped with means for increasing the target set value of the pressure in the air supply duct 4, and among the operation amounts of the dampers 3a to 3d obtained by the arithmetic means. , at least one of the dampers has a value in the open direction, and at least one or more of the dampers corresponding to the value in the open direction is fully open, and the supply air blower 5
When the rotation speed of the cold/hot water control valve 11 is at the upper limit of the control range,
means for changing the target setting value of the cold/hot water temperature at the outlet of the cold/hot water coil 12 from the reference value in the direction of increasing the opening degree of the dampers 3a to 3 obtained by the calculation means.
There is no value in the opening direction among the manipulated variables of d, at least one or more is a value in the closing direction, and at least one or more of the dampers corresponding to the value in the closing direction is fully open, and the cold/hot water coil I2 When the target setting value of the cold/hot water temperature at the outlet is changed in the direction of increasing the opening degree of the cold/hot water control valve 11, the target setting value of the cold/hot water temperature at the outlet of the cold/hot water coil 12 is changed in the direction closer to the reference value. Among the operation amounts of the dampers 3a to 3d obtained by the calculation means, there is no value in the opening direction, and at least one value is in the closing direction, and the damper corresponds to the value in the closing direction. When at least one of them is fully open, the target setting value of the cold/hot water temperature of the cold/hot water coil 12 is the reference value, and the rotation speed of the air supply blower 5 is not the lower limit of the control range, the air supply duct means for lowering the target setpoint of the pressure within.

Then, when a means for changing the target setting value of the pressure in the air supply duct 4 or the target setting value of the cold/hot water temperature at the outlet of the cold/hot water coil 12 is used, a correction calculation is performed to correct the operation amount of each damper 3a to 3d. means for operating each damper 3a to 3d with an operating amount equal to the value calculated by the correction calculation means, and adjusting the target set value of the pressure in the air supply duct 4 or the cold/hot water coil I2.
If no means is used to change the target set value of the hot and cold water temperature in the room, the operation amount of each damper is calculated in advance by comparing the temperature input signal of each air conditioning section 1a to 1d with the set temperature of each air conditioning section. The dampers 3a to 3d are configured to have means for operating each of the dampers 3a to 3d with an operating amount equal to the calculated value.

In this embodiment, the room temperature of each air conditioning section (Ia to Id) is detected by the room temperature sensor (2a to 2d), and the calculation means in the controller 17 calculates the difference between the set value of each section and the measured room temperature value to The operation amounts of 3a to 3d are calculated. FIG. 5 is a graph showing an example of the calculation relationship at this time.

Table 1 shows an example of calculating the room temperature, set value, and manipulated variable for each room.

Table 1 Example of manipulated variable calculation values (during cooling) In this way, the manipulated variable calculation values corresponding to each section can be obtained.

Next, the operating procedure of the present invention will be explained according to the flowchart shown in FIG.

Among the operation amount calculation values of each damper 3a to 3d, (1), when one or more values are in the opening direction, for example, the example in Table 1 applies, but in this case, the controller 17 operates in the opening direction. The opening degree of each supply air damper 3c to 3d corresponding to the value of is detected by the opening degree signal or the number of steps remaining in the memory, and (
1-^) When at least one of these is fully open, for example, when the damper 3d is fully open, it is no longer possible to increase the supply air by operating the damper. Therefore, in the present invention, as another method for increasing the cooling capacity, the controller 17 first increases the internal pressure of the air supply duct while keeping the outlet temperature of the cold/hot water coil outlet as stable as possible. As a procedure, the rotational speed of the air supply blower is detected (1-A-i), and if it is not the upper limit of the control range, an operation is performed to increase the set value of the internal pressure of the air supply duct. This increases the air supply internal pressure, making it possible to increase the amount of air supply even to sections where the air supply damper cannot be opened any further.

However, since the calculated value of the manipulated variable will increase the amount of air supplied to a section that does not require any more air supply, in the present invention, after performing a correction calculation on the manipulated variable of the damper, Determine the actual damper operation amount and operate the damper.

FIG. 6 is a graph showing an example of the relationship between the duct internal pressure change amount and the damper operation amount. For example, damper 3C of section 1c
Assuming that is fully open, the calculated value of the manipulated variable of 3c is shown in Table 1.
From this value, using the relationship shown by the broken line in Figure 6 to determine the amount of change in the duct internal pressure setting, the value is +1.This value of +1 may be a pressure value, or it can be used as the signal level of the pressure sensor. You can often change settings using this value.

Next, using the relationship shown by the solid line in Figure 6 to find the damper operation amount correction value, it becomes 11 steps, and using this value to perform correction calculations for the operation amounts of all dampers, as shown in Table 2. Therefore, the operating amounts of all the dampers are the values obtained by subtracting one step from the calculated values obtained in Table 1, and the operating amount of the damper 3C in the section 1c is 0 steps.

Table 2 Correction of operation amount The controller 17 uses the calculation results in Table 2 to operate each of the dampers 3a to 3d. The process from raising the set value of the duct internal pressure to calculating the operation amount correction for each damper can be instantaneously performed by using a microcomputer, so the operations can actually be performed almost simultaneously.

Also, (1-^-guchi), when the damper of the compartment IC is fully open and the rotational speed of the air supply fan is already at its upper limit,
As an unavoidable measure, the set value of the water temperature at the outlet of the hot and cold water coil 12 is changed to increase the capacity. In this case, the temperature set value is changed in the direction of increasing the opening degree of the cold/hot water control valve, that is, the set value is lowered during cooling, and the set value is increased during heating. Figure 7 shows an example of the relationship between the cold and hot water outlet temperature setting change and the damper operation amount. Figure 7-b shows the relationship between the operation amount correction value of each damper and the operation amount of the cold and hot water control valve (shown by the solid line in the figure). shows the relationship between

As an example, if the damper 3C of the compartment IC in Table 1 is fully open and the rotation speed of the supply air blower 5 is at the upper limit, the calculated value of the damper operation amount of the compartment IC is +1, so the seventh
From the relationship shown by the broken line in Figure 7-a, the corresponding operating amount of the cold/hot water control valve is +1, and from Figure 7-b, the set value of the cold/hot water outlet temperature is changed by -1 during cooling and +1 during heating. An operation is performed. The numerical value +1°-1 mentioned here may be a temperature or a signal level of a temperature sensor.

By changing the setting of the cold and hot water outlet temperature, the cooling and heating capacity increases in the same way as increasing the supply air pressure. Therefore, it is necessary to correct the operation amount of the damper in each compartment, and the solid line in Figure 7-a Calculating the damper operation amount correction value using the shown relationship takes 11 steps, and when this value is used to perform correction calculations for all the damper operation amounts, the results are as shown in Table 3.
All dampers have values obtained by subtracting one step from the calculated values obtained in Table 1, and the operation amount of damper 3C of section IC is O.
It becomes a step.

Table 3 Correction of operation amount The controller 17 operates each of the dampers 3a to 3d using the calculation results of Table 3 obtained in this way. Since the process from changing the setting of the cold and hot water outlet temperature to calculating the operation amount correction for each damper can be performed instantly by using a micro combi coater, the operations can actually be performed almost simultaneously.

In addition, (l-B), dampers 3 corresponding to sections 1a to 1d
The operation amount calculation values a to 3d are checked, and if at least one of them is a value in the opening direction, and there are no dampers that are fully open among the dampers corresponding to the values in the opening direction, the controller 17
operates each damper 3a to 3d with the same value as the calculated value. That is, in the example of Table 1, the damper 3a has 11 steps,
The damper 3b is stopped, the damper 3c is operated by +1 step, and the damper 3d is operated by +2 steps.

In addition, (2-A), the operation amount calculation values of the dampers 3a to 3d corresponding to the sections 1a to 1d are checked, and among them, there is no value in the open direction, and there is one or more values in the closed direction. Sometimes (2-^-i) Check the opening degree of the dampers, and if some of them are fully open, (2-A-i a),
Check the set value of the cold and hot water outlet temperature, and if the set temperature has been changed in the direction of increasing the degree of opening of the cold and hot water control valve, change the cold and hot water outlet temperature as soon as possible in order to increase the utilization efficiency of the heat storage tank. It is important to return the setting to its original value, and the setting of the cold/hot water outlet temperature is changed in accordance with the calculated value of the operation amount of the damper corresponding to the fully open damper, that is, the set value is increased during cooling, and the set value is decreased during heating.

Figure 8 shows an example of the relationship between the cold and hot water outlet temperature setting change and the damper operation amount, and Figure 8-a shows the relationship between the operation amount calculation value of the fully open damper and the cold and hot water control valve operation amount (dashed line in the figure). Figure 8-b shows the relationship between the operation amount correction value of each damper and the operation amount of the cold and hot water control valve (indicated by the solid line in the figure). Shows the relationship between quantities.

Table 4 shows an example in which among the operation amount calculation values of each damper, there are no values in the opening direction, and there are values in the closing direction.

Table 4 Example of manipulated variable calculation value (during cooling) and as shown in Table 5.

Table 5 Correction of operation amount When the damper 3C of the section IC in Table 4 is fully opened, the rotation speed of the supply air blower is at the upper limit, and the cold and hot water outlet temperature is set in the direction of increasing the cold and hot water control valve opening. To give an example when the temperature is changed, the calculated value of the damper operation amount in section 1c is -2, so from the relationship shown by the broken line in Figure 8-a,
The operating amount of the cold and hot water control valve for this is -2, and from Figure 8-b, the set value of the cold and hot water outlet temperature is +2 during cooling,
The changing operation is performed only during heating -2. Since the heating and cooling capacity decreases due to this change in the setting of the cold and hot water outlet temperature, it is necessary to perform a correction calculation for the damper operation amount in each section, and this calculation calculates the damper operation amount correction value using the relationship shown by the solid line in Figure 8a. Now, for dampers that are already fully closed, correction calculations will not be performed for sections that do not require operation in the opening direction.

Table 5 assumes that the damper in section 1b is fully closed.

The controller 17 operates each of the dampers 3a to 3d using the calculation results shown in Table 5 thus obtained. By promptly returning the cold/hot water return temperature to the original set value in this manner, it is possible to minimize the decrease in the utilization efficiency of the heat storage tank.

In addition, (2-^-E b-1), the operation amount calculation values of the dampers 3a to 3d corresponding to the sections 1a to 1d are examined, and among them, there are no values in the closing direction, and there are no values in the closing direction. 1
Among them, the damper opening degree is fully open, the set value of the cold and hot water outlet temperature is the standard value and the set value has not been changed, and the rotation speed of the air supply blower is not the lower limit value. In this case, an operation is performed to lower the setting of the air supply duct internal pressure in accordance with the operation amount calculation value of the damper corresponding to the fully open damper. FIG. 9 is a graph showing an example of the relationship between the duct internal pressure change amount and the damper operation amount.

For example, if the calculation results in Table 4 indicate that the damper 3c in section 1c is fully open, the calculated value of the manipulated variable of 3c is - from Table 4.
2, and if the amount of change in the duct internal pressure setting is calculated from this value using the relationship shown by the broken line in FIG. 9, it becomes -2, and the duct internal pressure setting is changed using this value. Next, as the duct internal pressure decreases, the heating and cooling capacity decreases, so if the damper operation amount is corrected using the relationship shown by the solid line in Figure 9, the result will be as shown in Table 6, and this actual operation amount will be Operate each damper 3a to 3d.

Table 6 Correction of operation amount Also in this calculation, correction calculations are not performed for dampers that are already fully closed and where no operation in the opening direction is required. By quickly restoring the duct internal pressure in this manner, wasteful speed-up operation of the supply air blower is prevented, and an energy-saving operation effect can be obtained.

In addition, (2-A-E b-2), the operation amount calculation values of the dampers 3a to 3d corresponding to the sections 1a to 1d are checked, and it is found that there is no value in the opening direction, and there is no value in the closing direction. There are more than one, and some of them have the damper fully open.
If the set value of cold and hot water outlet temperature is the standard value and the set value has not been changed, and the rotation speed of the supply air blower is the lower limit value, and (2-8-outlet), in sections 1a-1d. Check the operation amount calculation values of the corresponding dampers 3a to 3d, and if there are no values in the open direction and one or more values in the close direction, and none of them are fully open, The controller 17 operates each damper 3a to 3d using the same value as the calculated value.

That is, in the example shown in Table 4, the dampers 3a and 3b are operated in 1 step, the damper 3c is operated in 12 steps, and the damper 3d is stopped. (2-B) Check the operation amount calculation values of the dampers 3a to 3d corresponding to the sections 1a to 1d, and if there are no values in the opening direction or values in the closing direction,
The controller 17 does not operate the damper at all.

Through such operations, the present invention maintains the room temperature in each air conditioning section at the set value, saves blower power by keeping the duct internal pressure to the necessary minimum, and maintains the outlet temperature of cold and hot water to reduce the heat storage tank. It is possible to improve the utilization efficiency of

In this embodiment, the damper is operated by calculating the operation amount of the damper, but the damper is controlled by using a wind speed sensor to control the air volume to a set value, and the set value of the air volume is calculated. There is no problem as a setting method.

〔Effect of the invention〕

The present invention provides an air conditioner as described above,
The opening/closing operation of the supply air damper in each air conditioning compartment is controlled to maintain the room temperature in each air conditioning compartment at the target value, and the rotation speed of the supply air blower and the pressure in the supply air duct are set to variable target values only when the damper is fully open. By controlling the cold and hot water control valve to maintain the cold and hot water temperature at the cold and hot water outlet at a variable target value only when the supply air blower rotation speed is at its maximum, the comfort of the air-conditioned compartment is prevented. This not only reduces the power consumption of the air supply blower, resulting in energy savings, but also stabilizes the temperature of the water returned from the air conditioner to the heat storage tank, increasing the efficiency of use of the heat storage tank.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner of the present invention, and FIG.
Fig. 1 is a control flowchart, Fig. 3 is a schematic diagram of a conventional air conditioner, Fig. 4 is a graph showing the water temperature at the outlet of the hot and cold water coil as a function of air volume and supply air temperature, and Fig. 5 is a graph showing the relationship between air volume and supply air temperature. Graph showing the relationship between the room temperature deviation of the compartment and the damper operation amount, No. 6
The figures are graphs showing the relationship between the duct internal pressure change amount and the damper operation amount, Figures 7-a and 8-a are graphs showing the relationship between the damper operation amount and the cold/hot water control valve operation amount, and Figure 7-b. Figure, 8th
-b is a graph showing the relationship between the cold/hot water outlet temperature and the cold/hot water control valve operation amount, and FIG. 9 is a graph showing the relationship between the damper operation amount and the duct internal pressure change amount. 1a to 1d...Air conditioning section, 2a to 2d...Room temperature sensor, 3a to 3d...Damper, 4...Air supply duct, 5
...Air supply blower, 6...Transmission device, 7...Pressure sensor, 8.9...Controller, 10.16...Temperature sensor, 11...Cold/hot water control valve, 12...・Cold/hot water coil, 13... Cold/hot water piping, 14... Filter,
15...Return air duct, 17...CONTROPH patent applicant Keito Yoshimine, representative of Ebara Corporation
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Claims (1)

[Claims] 1. A variable rotation speed air supply blower for supplying conditioned air through an air supply duct to a room divided into a plurality of air conditioning sections, a cold/hot water coil, and a cold/hot water control. and a control device that controls the rotational speed of the air supply blower, the cold/hot water control valve, and a plurality of dampers that adjust the amount of air injected into each air conditioning section. In the conditioner, the control device includes a means for controlling the opening and closing operations of each damper to maintain the room temperature of each air conditioning section at a target value, and also controls the rotation speed of the supply air blower and the pressure in the supply air duct when the damper is fully opened. control valve to maintain the cold/hot water temperature at the outlet of the cold/hot water coil at the variable target value only when the supply air blower is at maximum rotation speed. An air conditioner featuring: 2. The control device includes a calculation means that compares the temperature inlet signal of each air conditioning section with the set temperature of each air conditioning section and calculates the operation amount of each damper that adjusts the amount of air injected into each air conditioning section, When at least one or more of the operation values of each damper is a value in the opening direction, and at least one or more of the dampers corresponding to the value in the opening direction is fully open, using the value obtained by the calculation means. , comprising means for increasing a target set value of the pressure in the air supply duct, at least one of the operation amounts of each damper obtained by the calculation means is a value in the opening direction,
When at least one of the dampers corresponding to the value in the opening direction is fully open and the rotation speed of the supply air blower is at the upper limit of the control range, the cold and hot water control valve is It has a means for changing the target setting value of the temperature of cold and hot water at the outlet of the water coil by removing it from the standard value, and there is no value in the opening direction among the operating amounts of each damper obtained by the calculating means, and at least one At least one of the dampers corresponding to the value in the open direction and the value in the close direction is fully open, and the target set value of the cold and hot water temperature at the cold and hot water coil outlet increases the opening degree of the cold and hot water control valve. means for changing the target setting value of the cold/hot water temperature at the outlet of the cold/hot water coil in a direction approaching the reference value; There is no value in the open direction, at least one of the dampers has a value in the close direction, and at least one or more of the dampers corresponding to the value in the close direction is fully open, and target setting of cold and hot water temperature at the outlet of the cold and hot water coil. The air supply system according to claim 1, further comprising means for reducing the target set value of the pressure in the supply air duct when the value is a reference value and the rotational speed of the supply air blower is not at the lower limit of the control range. harmonizer. 3. When using a means for changing the target set value of the pressure in the air supply duct or the target set value of the chilled/hot water temperature at the outlet of the chilled/hot water coil, it is provided with a correction calculation means for correcting the operation amount of each damper, and It has means for operating each damper with a manipulated variable equal to the value calculated by the correction calculation means, and means for changing the target set value of the pressure in the supply air duct or the target set value of the cold and hot water temperature at the outlet of the cold and hot water coil. If not used, it shall have a means for operating each damper with an operation amount equal to the operation amount of each damper calculated in advance by comparing the temperature input signal of each air conditioning section with the set temperature of each air conditioning section. The air conditioner according to claim 2, characterized in that: