VAV air conditioning system and air conditioning control method

Abstract

To reduce the number of revolutions of a fan, achieving reductions in necessary energy and cost.SOLUTION: An air conditioner controller 5 for a VAV air-conditioning system creates total static pressure balance information, which is a compilation of static pressure balance information on each VAV unit 1, and corrects the number of revolutions of a fan in an air conditioner 3 on the basis of the total static pressure balance information. The air conditioner controller 5 determines the total static pressure balance information to be a state of insufficient static pressure if the number of VAV units 1 whose static pressure balance information indicates insufficient static pressure is equal to or larger than a first number; determines the total static pressure balance information to be a proper state if the number of VAV units 1 indicating insufficient static pressure is smaller than the first number, and the number of VAV units whose static pressure balance information indicates excess static pressure is smaller than a second number; and determines the total static pressure balance information to be a state of excess static pressure if the number of VAV units 1 indicating insufficient static pressure is smaller than the first number, and the number of VAV units indicating excess static pressure is equal to or larger than the second number.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a VAV air conditioning system that adjusts the cooling / heating capacity by changing the amount of supply air discharged in response to fluctuations in the thermal load in an indoor space. [Background technology]

[0002] Conventionally, in VAV (Variable Air Volume) air conditioning systems, a variable air supply volume adjustment unit (VAV unit) is provided for each controlled area, and the amount of air blown out from this VAV unit is controlled by a VAV controller according to the load condition of the controlled area (see Patent Document 1).

[0003] Variable air volume control in a VAV air conditioning system uses inverter-type air conditioners that can control the air volume (fan rotation speed) according to the required air volume of each VAV unit. The fan rotation speed is proportional to the inverter frequency.

[0004] The air conditioner's fan speed F is calculated from the total required air volume Σvi, which is the sum of the required air volumes vi of each VAV unit, using the following formula (Figure 10). F = a × Σvi + b (where Vmin≦Σvi≦Vmax) (1) F = Fmin(Σvi <Vmin) ···(2) F = Fmax (Σvi>Vmax) (3)

[0005] In formula (1), a and b are predefined constants. Formula (2) means that when the total required airflow Σvi is smaller than the lower limit Vmin, the fan speed F is limited to the lower limit Fmin. Formula (3) means that when the total required airflow Σvi is larger than the upper limit Vmax, the fan speed F is limited to the upper limit Fmax.

[0006] In addition, in a VAV air conditioning system, total static pressure surplus / deficiency information is created based on static pressure surplus / deficiency information (status) sent from the VAV controller that controls each VAV unit, and the fan rotation speed F is increased or decreased based on the total static pressure surplus / deficiency information.

[0007] Each VAV controller outputs one of the following static pressure surplus / deficiency information: "insufficient static pressure," "appropriate," or "excessive static pressure" depending on the damper opening of the VAV unit it controls. If there is even one "insufficient static pressure" among the static pressure surplus / deficiency information sent from each VAV controller, the air conditioning control device sets the total static pressure surplus / deficiency information to "insufficient static pressure." If there is a mixture of "appropriate" and "excessive static pressure" among the static pressure surplus / deficiency information sent from each VAV controller, the air conditioning control device sets the total static pressure surplus / deficiency information to "appropriate." If all the static pressure surplus / deficiency information sent from each VAV controller is "excessive static pressure," the air conditioning control device sets the total static pressure surplus / deficiency information to "excessive static pressure."

[0008] If the total static pressure surplus / deficiency information is "insufficient static pressure," the air conditioning control device corrects the air conditioner's fan rotation speed F by increasing it by α% (α is a specified value). If the total static pressure surplus / deficiency information is "appropriate," the air conditioning control device maintains the current fan rotation speed F. If the total static pressure surplus / deficiency information is "excessive static pressure," the air conditioning control device corrects the fan rotation speed F by decreasing it by α%.

[0009] Each VAV controller determines the required air volume based on the indoor temperature and the indoor temperature set value, as shown in Fig. 11. In the example of Fig. 11, during cooling, if the indoor temperature is higher than the indoor temperature set value for cooling, the required air volume increases according to the characteristics in Fig. 11, and if the indoor temperature is equal to or lower than the indoor temperature set value for cooling, the required air volume becomes the minimum air volume. Also, during heating, if the indoor temperature is lower than the indoor temperature set value for heating, the required air volume increases according to the characteristics in Fig. 11, and if the indoor temperature is equal to or higher than the indoor temperature set value for heating, the required air volume becomes the minimum air volume.

[0010] The VAV controller controls the opening of the damper in the VAV unit to ensure the determined required air volume. Specifically, the VAV controller receives feedback of the measured air volume measured by the air volume sensor in the VAV unit and controls the damper opening so that the required air volume and the measured air volume are equal.

[0011] As shown in Figure 12, in the conventional technology, the fan speed is corrected to decrease only when all VAV units are in "excessive static pressure". Therefore, once the fan speed is corrected to increase, the fan speed is not corrected to decrease unless all VAV units are in "excessive static pressure". Therefore, even if there is a possibility that the fan speed could be reduced, the fan continues to operate at an excessively high speed, resulting in increased energy consumption and costs. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 3334069 Summary of the Invention [Problem to be solved by the invention]

[0013] The present invention has been made to solve the above-mentioned problems, and aims to provide a VAV air conditioning system and an air conditioning control method that can reduce the fan rotation speed and achieve energy savings and cost savings. [Means for solving the problem]

[0014] The VAV air conditioning system of the present invention includes an air conditioner, a VAV unit provided for each controlled area, a first control unit configured to control the opening of a damper of the VAV unit for each controlled area in accordance with a required air volume determined according to a load condition of the controlled area, a status notification unit configured to send static pressure surplus / deficiency information for each VAV unit based on the opening of the damper, a fan rotation speed determination unit configured to determine a fan rotation speed of the air conditioner based on a total required air volume obtained by adding up the values ​​of the required air volumes of each VAV unit, an information creation unit configured to create total static pressure surplus / deficiency information integrating the static pressure surplus / deficiency information of each VAV unit, a fan rotation speed correction unit configured to correct the fan rotation speed of the air conditioner based on the total static pressure surplus / deficiency information, and and a second control unit configured to control the fan of the air conditioner so as to achieve the corrected fan rotation speed, wherein the information creation unit sets the total static pressure over / under information to insufficient static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is a first number or more (the first number is an integer greater than or equal to 1 and less than the total number of the VAV units), sets the total static pressure over / under information to appropriate when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is less than a second number (the second number is an integer greater than or equal to 1 and less than the total number of the VAV units), and sets the total static pressure over / under information to excessive static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is equal to or greater than the second number.

[0015] Moreover, one configuration example of the VAV air conditioning system of the present invention is characterized in that it further comprises a setting change receiving unit capable of arbitrarily setting the first number and the second number.

[0016] Further, the air conditioning control method of the present invention includes a first step of controlling the opening of a damper of a VAV unit for each controlled area according to a required air volume determined according to a load condition of the controlled area, a second step of sending static pressure surplus / deficiency information for each VAV unit based on the opening of the damper, a third step of determining a fan rotation speed of an air conditioner supplying supply air to the VAV unit based on a total required air volume obtained by adding up the values ​​of the required air volumes of each VAV unit, a fourth step of creating total static pressure surplus / deficiency information that integrates the static pressure surplus / deficiency information of each VAV unit, a fifth step of correcting the fan rotation speed of the air conditioner based on the total static pressure surplus / deficiency information, and a sixth step of controlling the fan of the air conditioner so as to achieve the fan rotation speed determined in the third step and corrected in the fifth step. and the fourth step includes steps of setting the total static pressure over / shortage information to insufficient static pressure when the number of VAV units for which the static pressure over / shortage information indicates insufficient static pressure is a first number or more (the first number is an integer between 1 and the total number of VAV units), setting the total static pressure over / shortage information to appropriate when the number of VAV units for which the static pressure over / shortage information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / shortage information indicates excessive static pressure is less than a second number (the second number is an integer between 1 and the total number of VAV units), and setting the total static pressure over / shortage information to excessive static pressure when the number of VAV units for which the static pressure over / shortage information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / shortage information indicates excessive static pressure is equal to or greater than the second number.

[0017] Moreover, one configuration example of the air conditioning control method of the present invention is characterized in that it further includes a seventh step of being able to arbitrarily set the first number and the second number. Effect of the Invention

[0018] According to the present invention, when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is a first number or more, the total static pressure over / under information is set to insufficient static pressure, when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is less than a second number, the total static pressure over / under information is set to appropriate, and when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is equal to or greater than the second number, the total static pressure over / under information is set to excessive static pressure, thereby reducing the fan rotation speed and achieving energy and cost savings. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram for explaining a method for determining total static pressure excess / deficiency information and a method for determining fan rotation speed correction in the present invention. [Diagram 2] FIG. 2 is a block diagram showing the configuration of a VAV air conditioning system according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a block diagram showing the configuration of a VAV controller of a VAV air conditioning system according to an embodiment of the present invention. [Figure 4] FIG. 4 is a block diagram showing the configuration of an air conditioner of a VAV air conditioning system according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a block diagram showing the configuration of an air conditioner controller of a VAV air conditioning system according to an embodiment of the present invention. [Figure 6] FIG. 6 is a flowchart illustrating the operation of the VAV controller of the VAV air conditioning system according to the embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart illustrating the operation of the air conditioner controller of the VAV air conditioning system according to the embodiment of the present invention. [Figure 8] FIG. 8 is a flowchart illustrating the operation of the setting change receiving unit of the air conditioner controller of the VAV air conditioning system according to the embodiment of the present invention. [Figure 9]FIG. 9 is a block diagram showing an example of the configuration of a computer that realizes a VAV air conditioning system according to an embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the relationship between the fan rotation speed of the air conditioner and the total required air volume of each VAV unit. [Figure 11] FIG. 11 is a diagram for explaining a method of determining a required air volume based on the room temperature and the room temperature setting value. [Figure 12] FIG. 12 is a diagram for explaining a method for determining total static pressure excess / deficiency information and a method for determining fan rotation speed correction in the conventional technology. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] [Principle of the invention] With conventional technology, if the static pressure surplus / deficiency information sent from each VAV controller contained a mixture of "appropriate" and "excessive static pressure," the total static pressure surplus / deficiency information was set to "appropriate" and the fan rotation speed was maintained at the current level.

[0021] On the other hand, in the present invention, if the "static pressure excess" is equal to or exceeds a certain percentage or the number of units specified, the number of fan speeds is corrected downward. Furthermore, if the "static pressure deficiency" is equal to or exceeds a certain percentage or the number of units specified, the number of fan speeds is corrected upward (Figure 1).

[0022] That is, in the present invention, if the "static pressure shortage" in the static pressure excess / shortage information sent from each VAV controller is L units or more (L is an integer greater than or equal to 1 and less than the total number of VAV units), the total static pressure excess / shortage information is set to "static pressure shortage." Also, if the "static pressure shortage" in the static pressure excess / shortage information sent from each VAV controller is less than L units, and the "static pressure excess" in the static pressure excess / shortage information sent from each VAV controller is less than K units (K is an integer greater than or equal to 1 and less than the total number of VAV units), the total static pressure excess / shortage information is set to "appropriate." Also, if the "static pressure shortage" in the static pressure excess / shortage information sent from each VAV controller is less than L units, and the "static pressure excess" in the static pressure excess / shortage information sent from each VAV controller is K units or more, the total static pressure excess / shortage information is set to "static pressure excess."

[0023] As a result, in this invention, operation at an excessively high fan rotation speed is avoided, and the fan rotation speed can be suppressed to the minimum required. In this invention, although L may be set to 1 as in the prior art, by increasing L, it is possible to select active energy saving by maintaining or reducing the fan rotation speed even if there are some VAV units with "insufficient static pressure."

[0024] [Example] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 2 is a block diagram showing the configuration of a VAV air conditioning system according to an embodiment of the present invention. The VAV air conditioning system is composed of VAV units 1, which are variable air supply volume adjustment units provided for each controlled area (air conditioning zone) and control the amount of supply air supplied to each controlled area for each controlled area, VAV controllers 2 provided for each VAV unit 1 and controlling the corresponding VAV unit 1, air conditioners 3, supply air ducts 4 that supply air from the air conditioners 3 to each VAV unit 1, air conditioner controllers 5 that control the air conditioners 3, and a central system 6 that controls the entire system.

[0025] 3 is a block diagram showing the configuration of the VAV controller 2. Each VAV controller 2 includes a required air volume calculation unit 20 that calculates the required air volume of the VAV unit 1 based on the deviation between the indoor temperature of the corresponding controlled area and an indoor temperature set value set by the resident of the controlled area or the manager of the air conditioning system, an air volume control unit 21 (first control unit) that controls the opening of a damper that adjusts the supply air blowing volume of the VAV unit 1 so as to secure the required air volume calculated by the required air volume calculation unit 20, a required air volume notification unit 22 that notifies the air conditioner controller 5 of the value of the required air volume, and a status notification unit 23 that sends static pressure excess / deficiency information for each controlled area to the air conditioner controller 5.

[0026] Fig. 4 is a block diagram showing the configuration of the air conditioner 3. The air conditioner 3 includes a cooling coil 30, a heating coil 31, and a fan 32. It goes without saying that the configuration shown in Fig. 4 is just one example, and configurations other than that shown in Fig. 4 may be used.

[0027] 5 is a block diagram showing the configuration of the air conditioner controller 5. The air conditioner controller 5 includes an operation amount output unit 50 that outputs an operation amount for controlling the air conditioner 3 based on the deviation between the supply air temperature and the supply air temperature set value, an air volume calculation unit 51 that calculates the value of the total required air volume of the entire system from the value of the required air volume notified from each VAV controller 2, a fan rotation speed determination unit 52 that determines the fan rotation speed of the air conditioner 3 based on the calculated value of the total required air volume, an air volume control unit 53 (second control unit) that controls the fan 32 of the air conditioner 3, an information creation unit 54 that creates total static pressure excess / deficiency information based on the static pressure excess / deficiency information notified from each VAV controller 2, a fan rotation speed correction unit 55 that corrects the fan rotation speed of the air conditioner 3 based on the total static pressure excess / deficiency information, and a setting change acceptance unit 56 that can arbitrarily set K (second number of units) and L (first number of units) set in the information creation unit 54 according to a user request.

[0028] A VAV unit 1 and a VAV controller 2 are provided for each controlled area. Air (supply air) cooled or heated by an air conditioner 3 is supplied to the VAV unit 1 of each controlled area via an air supply duct 4, passes through the VAV unit 1, and is supplied to each controlled area. A damper (not shown) is provided within the VAV unit 1, so that the amount of supply air passing through the VAV unit 1 can be adjusted.

[0029] Next, the operation of this embodiment will be described. Fig. 6 is a flow chart for explaining the operation of the VAV controller 2, and Fig. 7 is a flow chart for explaining the operation of the air conditioner controller 5.

[0030] The required airflow calculation unit 20 of the VAV controller 2 calculates the required airflow vi of the VAV unit 1 to be controlled according to the heat load condition of the corresponding controlled area (FIG. 6, step S100). Specifically, the required airflow calculation unit 20 calculates the required airflow vi of the VAV unit 1 so that the indoor temperature PV of the corresponding controlled area matches the indoor temperature set value SP set by the resident of the controlled area or the manager of the air conditioning system.

[0031] The requested air volume notification unit 22 of the VAV controller 2 notifies the air conditioner controller 5 of the value of the requested air volume vi calculated by the requested air volume calculation unit 20 (Step S101 in FIG. 6). The air volume control unit 21 of the VAV controller 2 controls the opening of a damper (not shown) in the VAV unit 1 to be controlled so as to ensure the required air volume calculated by the required air volume calculation unit 20 (FIG. 6, step S102).

[0032] The status notification unit 23 of the VAV controller 2 sends static pressure excess / deficiency information indicating the current cooling / heating control state of the corresponding controlled area to the air conditioner controller 5 (step S103 in FIG. 6). The status notification unit 23 creates one of the static pressure excess / deficiency information types, "insufficient static pressure," "adequate," or "excessive static pressure," based on, for example, the damper opening of the VAV unit 1. Specifically, if the damper opening of the VAV unit 1 is fully open, the status notification unit 23 determines that the status is "insufficient static pressure." If the damper opening of the VAV unit 1 is not fully open but is equal to or greater than a predetermined opening (e.g., 85%), the status notification unit 23 determines that the status is "adequate." If the damper opening of the VAV unit 1 is less than the predetermined opening, the status notification unit 23 determines that the status is "excessive static pressure."

[0033] The pair of VAV controller 2 and VAV unit 1 performs the above-described processing of steps S100 to S103 at regular time intervals until air conditioning stops (YES in step S104 in FIG. 6).

[0034] Meanwhile, the manipulated variable output unit 50 of the air conditioner controller 5 calculates the manipulated variable using a predetermined control calculation algorithm (e.g., PID) so that the supply air temperature matches the supply air temperature set value, and outputs the manipulated variable to the air conditioner 3 (step S200 in FIG. 7). In this way, the amount of heat medium (cold water or hot water) supplied to the cooling coil 30 or heating coil 31 of the air conditioner 3 is adjusted in accordance with the manipulated variable, and the supply air temperature is controlled.

[0035] The air volume calculation unit 51 of the air conditioner controller 5 calculates a total required air volume Σvi by adding up the values ​​of the required air volumes vi notified from each VAV controller 2 (Step S201 in FIG. 7). The fan rotation speed determination unit 52 of the air conditioner controller 5 determines the fan rotation speed F of the air conditioner 3 based on the value of the total required air volume Σvi (Step S202 in FIG. 7). The fan rotation speed determination unit 52 determines the fan rotation speed F corresponding to the total required air volume Σvi based on the relational expressions shown in the above equations (1) to (3).

[0036] The information creation unit 54 of the air conditioner controller 5 creates total static pressure surplus / shortage information based on the static pressure surplus / shortage information notified from each VAV controller 2 (FIG. 7, step S203). In this embodiment, if there are L or more VAV controllers 2 with "insufficient static pressure" (L is an integer greater than or equal to 1 and less than the total number of VAV units 1) in the static pressure surplus / shortage information sent from each VAV controller 2, the information creation unit 54 sets the total static pressure surplus / shortage information to "insufficient static pressure".

[0037] Furthermore, when the number of VAV controllers 2 with "insufficient static pressure" is less than L units and the number of VAV controllers 2 with "excessive static pressure" is less than K units (K is an integer greater than or equal to 1 and less than the total number of VAV units 1), the information creation unit 54 sets the total static pressure surplus / deficiency information to "appropriate." Furthermore, when the number of VAV controllers 2 with "insufficient static pressure" is less than L units and the number of VAV controllers 2 with "excessive static pressure" is K units or more, the information creation unit 54 sets the total static pressure surplus / deficiency information to "excessive static pressure."

[0038] The fan rotation speed correction unit 55 of the air conditioner controller 5 corrects the fan rotation speed F of the air conditioner 3 based on the total static pressure surplus / deficiency information (step S204 in FIG. 7). As in the past, when the total static pressure surplus / deficiency information is "insufficient static pressure", the fan rotation speed correction unit 55 corrects and increases the fan rotation speed F determined by the fan rotation speed determination unit 52 by α% (α is a predetermined positive real number). When the total static pressure surplus / deficiency information is "appropriate", the fan rotation speed correction unit 55 maintains the current state of the fan rotation speed F determined by the fan rotation speed determination unit 52. When the total static pressure surplus / deficiency information is "excessive static pressure", the fan rotation speed correction unit 55 corrects and decreases the fan rotation speed F determined by the fan rotation speed determination unit 52 by α%.

[0039] The air volume control unit 53 of the air conditioner controller 5 controls the fan 32 of the air conditioner 3 so as to achieve the fan rotation speed F determined by the fan rotation speed determination unit 52 and corrected as necessary by the fan rotation speed correction unit 55 (FIG. 7, step S205). In this way, the volume of the supply air sent out from the air conditioner 3 is controlled. The air conditioner controller 5 performs the above-mentioned processing of steps S200 to S205 at regular intervals until air conditioning stops (YES in step S206 in FIG. 7). Each air conditioner controller 5 performs the processing of FIG. 7 for each corresponding air conditioner 3. Therefore, each air conditioner controller 5 performs the processing of FIG. 7 for the VAV units 1 and VAV controllers 2 that belong to the same air conditioning system (same air conditioner 3). Also, the number of VAV controllers 2 and the number of VAV units 1 described above are the numbers within the range that belong to the same air conditioning system (same air conditioner 3).

[0040] In this manner, in this embodiment, the fan rotation speed F can be reduced, and energy and cost savings can be achieved.

[0041] In the above example, the values ​​of K and L are fixed, but in this embodiment, the values ​​of K and L can be changed by the setting change receiving unit 56 of the air conditioner controller 5. Fig. 8 is a flowchart explaining the operation of the setting change receiving unit 56. When a setting change request is made by a user such as an administrator who operates an input device (not shown) of the air conditioner controller 5 (YES in step S300 in Fig. 8), the setting change receiving unit 56 receives the request from the user (step S301 in Fig. 8).

[0042] Then, the setting change receiving unit 56 updates the values ​​of K and L set in the information creating unit 54 to the values ​​of K and L specified by the user (step S302 in FIG. 8). As described above, K can be set within the range of 1 or more and up to the total number of VAV units 1, and L can be set within the range of 1 or more and up to the total number of VAV units 1. In this way, in this embodiment, the values ​​of K and L can be changed arbitrarily, and the balance between the comfort of the thermal environment and the energy saving performance can be changed as necessary.

[0043] Each of the VAV controller 2 and the air conditioner controller 5 of this embodiment can be realized by a computer equipped with a CPU (Central Processing Unit), a storage device, and an interface with the outside, and a program that controls these hardware resources. An example of the configuration of this computer is shown in Figure 9. The computer is equipped with a CPU 300, a storage device 301, and an interface device (I / F) 302.

[0044] In the case of the VAV controller 2, the VAV unit 1, the air conditioner controller 5, a temperature sensor in the controlled area, etc. are connected to the I / F 302. In the case of the air conditioner controller 5, the air conditioner 3, the VAV controller 2, the central system 6, etc. are connected to the I / F 302. A program for realizing the air conditioning control method of the present invention is stored in the storage device 301. The CPU 300 of each device executes the processing described in this embodiment in accordance with the program stored in the storage device 301. [Industrial Applicability]

[0045] The present invention can be applied to a VAV air conditioning system. [Explanation of symbols]

[0046] 1...VAV unit, 2...VAV controller, 3...air conditioner, 4...air supply duct, 5...air conditioner controller, 6...central system, 20...required air volume calculation section, 21...air volume control section, 22...required air volume notification section, 23...status notification section, 30...cooling coil, 31...heating coil, 32...fan, 50...operation quantity output section, 51...air volume calculation section, 52...fan rotation speed determination section, 53...air volume control section, 54...information creation section, 55...fan rotation speed correction section, 56...setting change reception section.

Claims

1. Air conditioners and A VAV unit provided for each controlled area; a first control unit configured to control an opening degree of a damper of the VAV unit for each controlled area in accordance with a required air volume determined according to a load condition of the controlled area; a status notification unit configured to send static pressure excess / deficiency information for each VAV unit based on an opening degree of the damper; a fan rotation speed determination unit configured to determine a fan rotation speed of the air conditioner based on a total required air volume obtained by adding up the required air volumes of the VAV units; an information generating unit configured to generate total static pressure excess / deficiency information by integrating the static pressure excess / deficiency information of each VAV unit; a fan rotation speed correction unit configured to correct a fan rotation speed of the air conditioner based on the total static pressure excess / deficiency information; a second control unit configured to control a fan of the air conditioner so as to achieve a fan rotation speed determined by the fan rotation speed determination unit and corrected by the fan rotation speed correction unit; The information creation unit sets the total static pressure over / under information to insufficient static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is a first number or more (the first number is an integer greater than or equal to 1 and less than the total number of VAV units), sets the total static pressure over / under information to appropriate when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is less than a second number (the second number is an integer greater than or equal to 1 and less than the total number of VAV units), and sets the total static pressure over / under information to excessive static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is equal to or greater than the second number.

2. 2. The VAV air conditioning system according to claim 1, The VAV air conditioning system further comprises a setting change receiving unit capable of arbitrarily setting the first number and the second number.

3. A first step of controlling an opening degree of a damper of a VAV unit for each controlled area in accordance with a required air volume determined according to a load condition of the controlled area; a second step of transmitting static pressure excess / deficiency information for each VAV unit based on the opening degree of the damper; a third step of determining a fan rotation speed of an air conditioner that supplies supply air to the VAV unit based on a total required air volume obtained by adding up the required air volumes of the VAV units; a fourth step of generating total static pressure excess / shortage information by integrating the static pressure excess / shortage information of each VAV unit; a fifth step of correcting a fan rotation speed of the air conditioner based on the total static pressure excess / deficiency information; and a sixth step of controlling the fan of the air conditioner so as to achieve the fan rotation speed determined in the third step and corrected in the fifth step, The fourth step is an air conditioning control method characterized in that it includes steps of setting the total static pressure over / under information to insufficient static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is a first number or more (the first number is an integer greater than or equal to 1 and less than the total number of the VAV units), setting the total static pressure over / under information to appropriate when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is less than a second number (the second number is an integer greater than or equal to 1 and less than the total number of the VAV units), and setting the total static pressure over / under information to excessive static pressure when the number of VAV units for which the static pressure over / under information indicates insufficient static pressure is less than the first number and the number of VAV units for which the static pressure over / under information indicates excessive static pressure is equal to or greater than the second number.

4. The air conditioning control method according to claim 3, An air conditioning control method, further comprising a seventh step of arbitrarily setting the first number and the second number.

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