JP7628880B2 - VAV air conditioning system and air conditioning control method - Google Patents

Description

The present invention relates to a VAV air conditioning system that adjusts the heating and cooling capacity by changing the amount of supply air discharged in response to fluctuations in the heat load of the indoor space.

Conventionally, in a VAV (Variable Air Volume) air conditioning system, a variable air supply volume adjustment unit (VAV unit) is provided for each controlled area, and the volume 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 Documents 1 and 2).

Variable air volume control in VAV air conditioning systems 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.

The fan speed F of the air conditioner is calculated from the total required air volume Σvi obtained by adding up the required air volumes vi of each VAV unit, using the following formula (FIG. 13).
F = a × Σvi + b (where Vmin ≦ Σvi ≦ Vmax) ... (1)
F=Fmin(Σvi<Vmin)...(2)
F=Fmax(Σvi>Vmax)...(3)

In formula (1), a and b are predefined constants. Formula (2) means that if 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 if the total required airflow Σvi is larger than the upper limit Vmax, the fan speed F is limited to the upper limit Fmax.

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.

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" in 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" in 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."

If the total static pressure surplus/deficiency information is "insufficient static pressure", the air conditioning control device corrects the air conditioner's fan 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 speed F. If the total static pressure surplus/deficiency information is "excessive static pressure", the air conditioning control device corrects the fan speed F by decreasing it by α%.

Furthermore, Patent Document 2 discloses a method for updating the equation showing the relationship in FIG. 13 with an approximation curve based on accumulated data.

In conventional technology, the fan speed F is determined based on equations (1) to (3), which are linear relationships that saturate at the upper and lower limits, for the total required air volume Σvi, and then correction is made based on total static pressure surplus/deficiency information, which is feedback on the indoor environment. However, there is a problem in that a delay occurs until the desired indoor environment is achieved while the feedback control of the correction is stabilized. The circumstances in which such a problem occurs will be explained in detail.

Let us assume that at a certain point in time, the total required airflow Σvi obtained by adding up the required airflows vi from each VAV controller is V1, and the fan speed F calculated using a linear relational equation is F1 (Figure 14). After that, the fan speed F is increased by α% at a time until there is no more "insufficient static pressure" information in the static pressure surplus/deficiency information sent from each VAV controller, and when there is no more "insufficient static pressure" after N times (N is a positive integer), the fan speed F becomes (1 + N x α) x F1 (Figure 15).

If one incremental correction is performed at a fixed cycle of ΔT time, then there will be a time delay of N x ΔT until the desired fan rotation speed is reached after N corrections. This time delay occurs in region 100 in Figure 16, where a "static pressure deficiency" occurs in the VAV when the relationship equations (1) to (3) are used. The ● mark 101 in Figure 16 indicates the fan rotation speed after correction, where a "static pressure deficiency" no longer occurs.

The technology disclosed in Patent Document 2 attempts to solve the above problems by updating the linear relational equation with an approximation curve based on accumulated data. However, because the approximation curve is calculated using all data, including the time when the fan speed increase correction is repeated, the approximation curve is updated to be lower. Therefore, even if the updated approximation curve is used, the fan speed still needs to be increased, and there is still a delay before the desired indoor environment is achieved.

Patent No. 3334069 Patent No. 3805965

The present invention has been made to solve the above problems, and aims to provide a VAV air conditioning system and an air conditioning control method that can improve the responsiveness of air conditioning control.

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, a fan rotation speed correction unit configured to correct the fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit, and a fan rotation speed correction unit configured to correct the fan rotation speed of the air conditioner so as to achieve the fan rotation speed determined by the fan rotation speed determination unit and corrected by the fan rotation speed correction unit. the static pressure surplus/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or less than a specified number U (U is an integer equal to or greater than 0, with an initial value of 0), and the number of extracted data is equal to or greater than the specified number U, and the number of extracted data is equal to or greater than the specified number U.

The VAV air conditioning system of the present invention further comprises an air conditioner, a VAV unit provided for each controlled area, a first control unit configured to control an 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 values of the required air volumes of each VAV unit, a fan rotation speed correction unit configured to correct the fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit, a second control unit configured to control the fan of the air conditioner to the fan rotation speed determined by the fan rotation speed determination unit and corrected by the fan rotation speed correction unit, and a status notification unit configured to determine a status of the air conditioner when a specified condition is satisfied from data on the total required air volume and fan rotation speed of past air conditioning. the static pressure excess/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or greater than a first specified number L and equal to or less than a second specified number U (L and U are integers equal to or greater than 0, L≦U, and an initial value of L is equal to or greater than 1), the static pressure excess/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or greater than a first specified number L and equal to or less than a second specified number U (L and U are integers equal to or greater than 0, L≦U, and an initial value of L is equal to or greater than 1), the static pressure excess/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or greater than a first specified number L, the static pressure excess/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or greater than a first specified number L, and the static pressure excess/deficiency information indicating a static pressure deficiency in a number of VAV units is equal to or greater than a first specified number L,
In addition, in one configuration example of the VAV air conditioning system of the present invention, the relational equation derivation unit is characterized in that it derives a relational equation between the total required air volume and the fan rotation speed based on the extracted data by a nonlinear regression method or a piecewise linear regression method.

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/deficient 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 correcting the fan rotation speed of the air conditioner based on total static pressure surplus/deficient information obtained by integrating the static pressure surplus/deficient information of each VAV unit, and a fifth 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 fourth step. a sixth step of extracting data that satisfies specified conditions from past data on the total required air volume and fan rotation speed of the air conditioning by a specified extraction method ; a seventh step of deriving a relational equation between the total required air volume and the fan rotation speed based on the extracted data; and an eighth step of updating the relational equation between the total required air volume and the fan rotation speed used in the third step to the relational equation derived in the seventh step , wherein the specified extraction method is a method of extracting data where the number of VAV units for which the static pressure surplus/deficiency information indicates a static pressure deficiency is equal to or less than a specified number U (U is an integer equal to or greater than 0, with an initial value of 0), while repeatedly increasing the specified number U by 1 until the number of extracted data becomes equal to or greater than the specified number of data .

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 in accordance with 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 correcting the fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit, a fifth 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 fourth step, and extracting data that satisfies a specified condition from past data on the total required air volume and fan rotation speed of the air conditioning by a predetermined extraction method. the sixth step of deriving a relational equation between the total required air volume and the fan rotation speed based on the extracted data; and the eighth step of updating the relational equation between the total required air volume and the fan rotation speed used in the third step to the relational equation derived in the seventh step, wherein the predetermined extraction method is a method of extracting data in which the number of VAV units for which the static pressure excess/deficiency information indicates a static pressure deficiency is equal to or greater than a first specified number L and equal to or less than a second specified number U (L and U are integers equal to or greater than 0, L≦U, and an initial value of L is equal to or greater than 1), while repeatedly decreasing the first specified number L by 1 until the number of extracted data becomes equal to or greater than the specified number of data, and after the first specified number L reaches a lower limit , repeating the extraction of the data while increasing the second specified number U by 1 until the number of extracted data becomes equal to or greater than the specified number of data.
In addition, in one configuration example of the air conditioning control method of the present invention, the seventh step is characterized by including a step of deriving a relational equation between the total required air volume and the fan rotation speed based on the extracted data by a nonlinear regression method or a piecewise linear regression method.

According to the present invention, data on the number of VAV units for which the static pressure surplus/deficiency information indicates a static pressure deficiency is zero or close to zero is extracted from past data on the total required airflow and fan speed of air conditioning, and a relational equation between the total required airflow and the fan speed is derived based on the extracted data. The relational equation set in the fan speed determination unit is updated to the relational equation derived by the relational equation derivation unit, thereby reducing the number of times the fan speed is corrected or determining a relational equation that does not require correction of the fan speed, thereby improving the responsiveness of air conditioning control.

FIG. 1 is a diagram showing the relationship between the total required air volume and the fan rotation speed when the number of times the fan rotation speed is corrected is reduced or when there is no need to correct the fan rotation speed. FIG. 2 is a diagram for explaining the method of optimizing the air conditioner fan rotation speed control of the present invention. FIG. 3 is a block diagram showing the configuration of a VAV air conditioning system according to an embodiment of the present invention. FIG. 4 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. FIG. 5 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. FIG. 6 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. FIG. 7 is a flowchart for explaining the operation of the VAV controller of the VAV air conditioning system according to the embodiment of the present invention. FIG. 8 is a flowchart for explaining the operation of the air conditioner controller of the VAV air conditioning system according to the embodiment of the present invention. FIG. 9 is a flowchart illustrating the operation of the analysis device for a VAV air conditioning system according to an embodiment of the present invention. FIG. 10 is a flowchart illustrating a first extraction method performed by the relational equation deriving unit according to the embodiment of the present invention. FIG. 11 is a flowchart illustrating a second extraction method performed by the relational equation deriving unit according to the embodiment of the present invention. FIG. 12 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. FIG. 13 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. FIG. 14 is a diagram showing the fan rotation speed when the correction is 0% in the conventional technology. FIG. 15 is a diagram showing the fan rotation speed when the fan rotation speed is increased by α% N times in the conventional technology. FIG. 16 is a diagram showing an example of an area where a static pressure shortage occurs in the conventional technology.

[Principle of the Invention]
Conventional technology requires feedback correction based on information on the total static pressure surplus or deficiency, resulting in a delay before the desired indoor environment is achieved. The delay occurs because the relationship between the total required air volume and the fan speed is expressed as a linear equation that saturates at the upper and lower limits, or because correction is required due to an approximation curve that is estimated on the low side.

In the present invention, by filtering the data by the number of VAV units with "insufficient static pressure," a relationship equation between "total required air volume and fan speed" is obtained that reduces the number of times the fan speed is corrected or does not require correction of the fan speed. Figure 1 shows an example of a relationship between total required air volume and fan speed that reduces the number of times the fan speed is corrected or does not require correction of the fan speed. As in Figure 16, the ● mark 101 in Figure 1 indicates the fan speed after correction where "insufficient static pressure" no longer occurs.

In this invention, operating data from air conditioning control over a certain period of time using conventional control and the number of VAV units with "insufficient static pressure" are used. By extracting data where the number of VAV units with "insufficient static pressure" is zero or close to zero from the accumulated data and finding an appropriate approximation function, it is possible to find a relationship between the total required air volume and the fan rotation speed that reduces the number of times the fan rotation speed is corrected or does not require correction of the fan rotation speed. By periodically calculating this relationship, it is also possible to successively update the relationship in response to changes in the accumulated data.

Figure 2 is a diagram explaining the method of optimizing air conditioner fan speed control of the present invention. In Figure 2, the x marks 200 indicate data for one or more VAV units with "insufficient static pressure", the + marks 201 indicate data for all VAV units with "excessive static pressure", the ● marks 202 indicate data for zero VAV units with "insufficient static pressure", and 203 indicates the relationship between the total required air volume and the fan speed in the initial state.

By extracting data for zero VAV units with "insufficient static pressure" and calculating the approximate function, the relationship between the total required air volume and the fan speed is as shown in 204 in Figure 2. In other words, in areas where the total required air volume is small, the fan speed is corrected to decrease, and in areas where the total required air volume is large, the fan speed is corrected to increase.

[Example]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 3 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 amount adjustment units provided for each controlled area (air conditioning zone) and control the amount of supply air supplied to each controlled area, a VAV controller 2 provided for each VAV unit 1 and controls the corresponding VAV unit 1, air conditioners 3, an air supply duct 4 that supplies the supply air from the air conditioners 3 to each VAV unit 1, an air conditioner controller 5 that controls the air conditioners 3, and an analyzer 6 provided in a central system 7.

Figure 4 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 the 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 ensure 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.

Figure 5 is a block diagram showing the configuration of the air conditioner 3. The air conditioner 3 is equipped with a cooling coil 30, a heating coil 31, and a fan 32. It goes without saying that the configuration shown in Figure 5 is just one example, and configurations other than that shown in Figure 5 may also be used.

Figure 6 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, and 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.

As shown in FIG. 1, the analysis device 6 includes a data storage unit 60 that stores data on the total required air volume, fan rotation speed, and static pressure surplus/deficiency information of air conditioning in the past, a data extraction unit 61 that extracts data from the past data in which the number of VAV units 1 for which the static pressure surplus/deficiency information indicates a static pressure deficiency is zero or close to zero, a relational equation derivation unit 62 that derives a relational equation between the total required air volume and the fan rotation speed based on the extracted data, and a relational equation update unit 63 that updates the relational equation between the total required air volume and the fan rotation speed set in the fan rotation speed determination unit 52 to the relational equation derived by the relational equation derivation unit 62.

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, and passes through the VAV unit 1 before being supplied to each controlled area. A damper (not shown) is provided within the VAV unit 1, allowing the amount of supply air passing through the VAV unit 1 to be adjusted.

Next, the operation of this embodiment will be described. Figure 7 is a flowchart explaining the operation of the VAV controller 2, and Figure 8 is a flowchart explaining the operation of the air conditioner controller 5.

The required air volume calculation unit 20 of the VAV controller 2 calculates the required air volume vi of the VAV unit 1 to be controlled according to the heat load condition of the corresponding controlled area (step S100 in FIG. 7). Specifically, the required air volume calculation unit 20 calculates the required air volume vi of the VAV unit 1 so that the indoor temperature PV of the corresponding controlled area matches the indoor temperature setting value SP set by the resident of the controlled area or the administrator of the air conditioning system.

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. 7).
The air volume control unit 21 of the VAV controller 2 controls the opening degree 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 (step S102 in FIG. 7).

The status notification unit 23 of the VAV controller 2 sends static pressure surplus/shortage information indicating the current cooling/heating control state of the corresponding controlled area to the air conditioner controller 5 (step S103 in FIG. 7). The status notification unit 23 creates static pressure surplus/shortage information, which is either "insufficient static pressure," "adequate," or "excessive static pressure," for example, based on 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 information 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 information is "excessive static pressure." If the damper opening of the VAV unit 1 is less than the predetermined opening, the status notification unit 23 determines that the information is "excessive static pressure."

The pair of VAV controller 2 and VAV unit 1 performs the above-described steps S100 to S103 at regular intervals until air conditioning is stopped (YES in step S104 in FIG. 7).

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. 8). In this way, the amount of heat transfer medium (cold water or hot water) supplied to the cooling coil 30 or heating coil 31 of the air conditioner 3 is adjusted according to the manipulated variable, and the supply air temperature is controlled.

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. 8).
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. 8). In the initial state, 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).

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 (step S203 in FIG. 8). As in the past, if there is even one "static pressure deficiency" 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 "static pressure deficiency". If there is a mixture of "appropriate" and "excessive static pressure" 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 "appropriate". If all the static pressure surplus/shortage information sent from each VAV controller 2 is "excessive static pressure", the information creation unit 54 sets the total static pressure surplus/shortage information to "excessive static pressure".

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. 8). As in the past, when the total static pressure surplus/deficiency information is "static pressure deficiency", the fan rotation speed correction unit 55 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 fan rotation speed F determined by the fan rotation speed determination unit 52. When the total static pressure surplus/deficiency information is "static pressure excess", the fan rotation speed correction unit 55 decreases the fan rotation speed F determined by the fan rotation speed determination unit 52 by α%.

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 (step S205 in FIG. 8). 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. 8). Each air conditioner controller 5 performs the processing of FIG. 8 for each corresponding air conditioner 3. Therefore, each air conditioner controller 5 performs the processing of FIG. 8 for the VAV units 1 and VAV controllers 2 that belong to the same air conditioning system (same air conditioner 3).

Figure 9 is a flow chart explaining the operation of the analysis device 6. During air conditioning operation, the data accumulation unit 60 of the analysis device 6 constantly collects and accumulates data on the total required air volume Σvi calculated by the air volume calculation unit 51, data on the fan speed F determined by the fan speed determination unit 52 and corrected as necessary by the fan speed correction unit 55, and static pressure surplus/deficiency information notified from each VAV controller 2 from the air conditioner controller 5 (step S300 in Figure 9).

The data extraction unit 61 of the analysis device 6 acquires data stored in the data storage unit 60 (step S301 in FIG. 9). From the acquired data, the data extraction unit 61 extracts data in which the number of VAV units 1 indicating "insufficient static pressure" in the static pressure surplus/deficiency information is 0 or close to 0 (step S302 in FIG. 9).

The following describes the data extraction method performed by the data extraction unit 61. The data extraction method includes a first data extraction method and a second data extraction method.
Fig. 10 is a flow chart explaining the first extraction method. First, the data extraction unit 61 extracts data in which the number of VAV units 1 in which the static pressure surplus/deficiency information indicates "insufficient static pressure" is U or less (U is an integer equal to or greater than 0, and the initial value is 0) from the data acquired from the data accumulation unit 60 (Fig. 10, step S400).

At the stage when data accumulation begins, there is a small amount of data, so if data below the specified number U=0 is extracted, the number of data required to derive the relational expression may not be obtained.
Therefore, if the number of data extracted in step S400 (a set of data consisting of the total required air volume Σvi, the fan rotation speed F, and static pressure surplus/deficiency information) falls below the specified number of data (NO in step S401 in FIG. 10), the data extraction unit 61 increments the specified number U by 1 (step S402 in FIG. 10) and returns to step S400.

In this way, the specified number U is increased by one each time to relax the conditions until the number of extracted data items is equal to or greater than the specified number of data items, and when the number of extracted data items is equal to or greater than the specified number of data items (YES in step S401), data extraction is terminated.

Figure 11 is a flowchart explaining the second extraction method. First, the data extraction unit 61 extracts data from the data acquired from the data accumulation unit 60 in which the number of VAV units 1 whose static pressure surplus/deficiency information indicates "insufficient static pressure" is between L and U (L and U are integers of 0 or more, L≦U, and the initial value of L is 1 or more) (Figure 11, step S500).

If the number of data extracted in step S500 is less than the specified number of data (NO in step S501 in FIG. 11), the data extraction unit 61 decrements the first specified number L by 1 (step S502 in FIG. 11). If the first specified number L is greater than the lower limit L0 (YES in step S503 in FIG. 11), the data extraction unit 61 returns to step S500. In this manner, the first specified number L is decremented by 1 until the number of extracted data becomes equal to or greater than the specified number of data. When the number of extracted data becomes equal to or greater than the specified number of data (YES in step S501), data extraction is terminated.

Furthermore, when the first specified number L reaches the lower limit L0 (NO in step S503), the data extraction unit 61 increments the second specified number U by 1 (step S504 in FIG. 11) and returns to step S500. In this way, after the first specified number L reaches the lower limit L0, the second specified number U is incremented by 1 each time until the number of extracted data items becomes equal to or greater than the specified number of data items. When the number of extracted data items becomes equal to or greater than the specified number of data items (YES in step S501), data extraction is terminated.

The second extraction method is used when it is acceptable for a small number of VAV units 1 to have "insufficient static pressure" compared to the total number of VAV units 1, and the fan rotation speed F is reduced to save energy.

Next, the relational equation derivation unit 62 derives a relational equation F=f(Σvi) between the total required air volume Σvi and the fan rotation speed F based on the data extracted by the data extraction unit 61 (step S303 in FIG. 9). The relational equation is obtained by approximating the relationship between the total required air volume Σvi and the fan rotation speed F indicated by the extracted data. Approximation methods include various linear or nonlinear regression methods, such as a nonlinear regression method or a piecewise linear regression method.

Next, the relational equation update unit 63 of the analysis device 6 updates the relational equation set in the fan rotation speed determination unit 52 of the air conditioner controller 5 to the relational equation F=f(Σvi) derived by the relational equation derivation unit 62 (step S304 in FIG. 9).
The analysis device 6 performs the above-mentioned processing of steps S300 to S304 at regular update intervals until air conditioning is stopped (YES in step S305 in FIG. 9). The analysis device 6 performs the processing of FIG. 9 for each air conditioner controller 5 (each air conditioner 3). Therefore, the number of VAV units 1 mentioned above is the number of VAV units 1 within the range that belong to the same air conditioning system (same air conditioner 3).

Each of the VAV controller 2, air conditioner controller 5, and analysis device 6 in 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 FIG. 12. The computer is equipped with a CPU 300, a storage device 301, and an interface device (I/F) 302.

In the case of the VAV controller 2, the VAV unit 1, the air conditioner controller 5, and a temperature sensor in the controlled area are connected to the I/F 302. In the case of the air conditioner controller 5, the air conditioner 3, the VAV controller 2, and an analysis device 6 are connected to the I/F 302. In the case of the analysis device 6, the air conditioner controller 5 is 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 according to the program stored in the storage device 301.

The present invention can be applied to VAV air conditioning systems.

1...VAV unit, 2...VAV controller, 3...air conditioner, 4...air supply duct, 5...air conditioner controller, 6...analysis device, 7...central system, 20...required air volume calculation unit, 21...air volume control unit, 22...required air volume notification unit, 23...status notification unit, 30...cooling coil, 31...heating coil, 32...fan, 50...operational variable output unit, 51...air volume calculation unit, 52...fan speed determination unit, 53...air volume control unit, 54...information creation unit, 55...fan speed correction unit, 60...data accumulation unit, 61...data extraction unit, 62...relationship equation derivation unit, 63...relationship equation update unit.

Claims (6)

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 the 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;
a fan rotation speed correction unit configured to correct a fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit;
a second control unit configured to control a fan of the air conditioner so as to achieve a fan speed determined by the fan speed determination unit and corrected by the fan speed correction unit;
a data extraction unit configured to extract data that satisfies a prescribed condition from data on a total required air volume and a fan rotation speed of the air conditioning in the past by a predetermined extraction method ;
a relational equation deriving unit configured to derive a relational equation between a total required air volume and a fan rotation speed based on the extracted data;
a relational equation update unit configured to update a relational equation between a total required air volume and a fan rotation speed, which is set in the fan rotation speed determination unit, to the relational equation derived by the relational equation derivation unit ,
The VAV air conditioning system is characterized in that the specified extraction method is a method of extracting data in which the number of VAV units for which the static pressure surplus/shortage information indicates a static pressure deficiency is less than or equal to a specified number U (U is an integer greater than or equal to 0, with an initial value of 0), while repeatedly increasing the specified number U by 1 until the number of extracted data becomes greater than or equal to the specified number of data . 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 the 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;
a fan rotation speed correction unit configured to correct a fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit;
a second control unit configured to control a fan of the air conditioner so that the fan rotation speed is determined by the fan rotation speed determination unit and corrected by the fan rotation speed correction unit;
a data extraction unit configured to extract data that satisfies a prescribed condition from data on a total required air volume and a fan rotation speed of the air conditioning in the past by a predetermined extraction method;
a relational equation deriving unit configured to derive a relational equation between a total required air volume and a fan rotation speed based on the extracted data;
a relational equation update unit configured to update a relational equation between a total required air volume and a fan rotation speed, which is set in the fan rotation speed determination unit, to the relational equation derived by the relational equation derivation unit,
The VAV air conditioning system is characterized in that the specified extraction method is a method of extracting data where the number of VAV units for which the static pressure surplus/shortage information indicates a static pressure deficiency is greater than or equal to a first specified number L and less than or equal to a second specified number U (L and U are integers greater than or equal to 0, L≦U, and the initial value of L is greater than or equal to 1), by repeatedly decreasing the first specified number L by 1 until the number of extracted data becomes greater than or equal to the specified number of data, and after the first specified number L reaches a lower limit, by repeatedly extracting the data by increasing the second specified number U by 1 until the number of extracted data becomes greater than or equal to the specified number of data. 3. The VAV air conditioning system according to claim 1,
The VAV air conditioning system, wherein the relational equation deriving unit derives a relational equation between the total required air volume and the fan rotation speed based on the extracted data by a nonlinear regression method or a piecewise linear regression method. 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 correcting the fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit;
a fifth 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 fourth step;
A sixth step of extracting data that satisfies a specified condition from the past data of the total required air volume and the fan rotation speed of the air conditioning by a predetermined extraction method ;
a seventh step of deriving a relational expression between a total required air volume and a fan rotation speed based on the extracted data;
an eighth step of updating the relational expression between the total required air volume and the fan rotation speed used in the third step to the relational expression derived in the seventh step ;
The air conditioning control method is characterized in that the specified extraction method is a method of extracting data where the number of VAV units for which the static pressure surplus/shortage information indicates a static pressure deficiency is less than or equal to a specified number U (U is an integer greater than or equal to 0, with an initial value of 0), while repeatedly increasing the specified number U by 1 until the number of extracted data becomes greater than or equal to the specified number of data . 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 correcting the fan rotation speed of the air conditioner based on total static pressure surplus/deficiency information obtained by integrating the static pressure surplus/deficiency information of each VAV unit;
a fifth 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 fourth step;
A sixth step of extracting data that satisfies a specified condition from the past data of the total required air volume and the fan rotation speed of the air conditioning by a predetermined extraction method;
a seventh step of deriving a relational expression between a total required air volume and a fan rotation speed based on the extracted data;
an eighth step of updating the relational expression between the total required air volume and the fan rotation speed used in the third step to the relational expression derived in the seventh step;
The predetermined extraction method is an air conditioning control method characterized in that it is a method of extracting data for which the number of VAV units for which the static pressure excess/shortage information indicates a static pressure deficiency is greater than or equal to a first specified number L and less than or equal to a second specified number U (L and U are integers greater than or equal to 0, L≦U, and an initial value of L is greater than or equal to 1), by repeatedly decreasing the first specified number L by 1 until the number of extracted data becomes greater than or equal to the specified number of data, and after the first specified number L reaches a lower limit , repeating the extraction of the data by increasing the second specified number U by 1 until the number of extracted data becomes greater than or equal to the specified number of data. The air conditioning control method according to claim 4 or 5 ,
The air-conditioning control method according to claim 7, further comprising the step of deriving a relational equation between the total required air volume and the fan rotation speed based on the extracted data by a nonlinear regression method or a piecewise linear regression method.

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