JP5461942B2 - Control apparatus and control method - Google Patents

Description

  The present invention relates to a control device and a control method in an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination.

  In the air conditioning control, for example, as shown in FIG. 4, individual air conditioners (for example, multi air conditioners for buildings) are installed for each room, and the resident uses the operation means such as a remote control to individually An air conditioning system for operating an air conditioner has been put into practical use (for example, see Patent Document 1). In the example of FIG. 4, heat exchange-type individual air conditioners 101-1 and 101-2 are provided in the rooms 100-1 and 100-2, respectively. 4, reference numerals 102-1 and 102-2 denote return air ducts 103-1 and 103-2 for returning air (return air) from the rooms 100-1 and 100-2 to the individual air conditioners 101-1 and 101-2. Is an air supply duct that supplies air (air supply) cooled or heated by the individual air conditioners 101-1 and 101-2 to the rooms 100-1 and 100-2, and 104-1 and 104-2 are air supply blowers. It is an exit.

On the other hand, the central air-conditioning system is configured to perform cooling using the outside air (outside air cooling) in the winter when the outside air temperature is low, and the control parameter adjustment is also efficient (patent) Reference 2).
In office buildings and the like, occupants and computers substantially become indoor heating products, so it is necessary to cool them during the daytime even in winter. The use of the outside air cooling is extremely effective from the viewpoint of energy saving because the outside air cooling that takes in the cold outside air and cools it can save the energy for cooling the air by an air conditioner or the like.

  Therefore, as shown in FIG. 5, a configuration in which the individual air conditioner and the outside air cooler are used in combination and the respective merits are utilized is conceivable. In FIG. 5, reference numeral 105 denotes an outside air cooler for introducing outside air into the room, 106 denotes an outside air intake port, and 107-1 and 107-2 supply outside air sent from the outside air cooler 105 to the rooms 100-1 and 100-2. The outdoor air ducts 108-1, 108-2 are the external air dampers for adjusting the supply amount of the external air, 109-1, 109-2 are the outdoor air outlets, 110-1, 110-2 are the rooms 100-1, 100-. 2 is a room temperature sensor that measures the room temperature, and 111 is an outside air temperature sensor that measures the outside air temperature.

As shown in FIG. 5, when an individual air conditioner and an outside air cooler are used together, both of them are installed as usual, so that the control of the individual air conditioner and the control of the outside air cooler compete, The efficiency of the room temperature control may be reduced.
Therefore, it is conceivable to apply the method disclosed in Patent Document 3 to avoid competition between the control of the individual air conditioner and the control of the outside air cooler. Hereinafter, the operation of the air conditioning system of FIG. 5 when the method disclosed in Patent Document 3 is applied will be described.

  If the room temperature can be controlled to the set temperature only by the outside air cooling (complete outside air cooling), it is preferable to give priority to the energy saving effect and to make only the outside air cooling. In such a case, it should be in the same state as the complete outside air cooling of the central air conditioning system (the state of room temperature feedback control by the operation of the outside air dampers 108-1 and 108-2), that is, the individual air conditioners 101-1 and 101. -2 will stop.

  Even if the outside air cooling is effective, if the room temperature cannot be lowered to the set temperature only by the outside air cooling, it becomes necessary to use the individual air conditioners 101-1 and 101-2 together. In such a case, it is energy saving to fix the outside air dampers 108-1 and 108-2 to the maximum opening and use the cooling effect by outside air as much as possible. 1, 101-2 only (the state of room temperature feedback control by the heat exchange unit of the individual air conditioners 101-1 and 101-2) should be performed.

  For example, when outside air cooling is not effective as in the case where the set value of the room temperature is 25.0 ° C. and the outside air temperature is 28.0 ° C., the purpose of ventilation is The reduction of carbon dioxide concentration. The carbon dioxide concentration is hardly a strict control target (control amount for feedback control). Therefore, the outside air dampers 108-1 and 108-2 should be fixed at the opening determined by the convenience of ventilation, and the room temperature should be controlled only by the individual air conditioners 101-1 and 101-2.

  When the above operations are arranged, according to the method disclosed in Patent Document 3, the control operation of the individual air conditioners 101-1 and 101-2 is stopped and the outside air dampers 108-1 and 108- are stopped during complete outside air cooling. Room temperature feedback control (control mode of outside air cooling) is performed with 2 as the control actuator, and the opening degree of the outside air dampers 108-1 and 108-2 is fixed otherwise, and the individual air conditioners 101-1 and 101-2 are used. Therefore, it is only necessary to switch the feedback control calculation so that room temperature feedback control (individual air-conditioning control mode) is performed with the heat exchanger as a control actuator. That is, the control calculation itself avoids duplication by operating only one of the outside air cooling control mode and the individual air conditioning control mode.

  Since the room temperature to be controlled should be the measured value at the same location in both the individual air conditioning and the outside air cooling, the room temperature sensor can be shared. As a case in which switching between the control mode of the outside air cooling and the individual air conditioning occurs when the room temperature control is being executed, the outside air cooling is effective, and the room temperature is set to the temperature set value by operating the outside air dampers 108-1 and 108-2. This is when the room temperature changes from the state where it can be maintained to the state where the room temperature cannot be maintained at the temperature set value even at the maximum opening degree of the outside air dampers 108-1 and 108-2, or vice versa. That is, priority is given to control by the operation of the outside air dampers 108-1 and 108-2 from the viewpoint of energy saving effect.

  Therefore, the switching judgment is as follows. When the outside air dampers 108-1 and 108-2 are at the maximum opening and the output of the heat exchange unit of the individual air conditioners 101-1 and 101-2 is in the lowest state, the room temperature becomes higher than the temperature set value. In addition, when the control mode of the individual air conditioning is selected and the room temperature becomes lower than the temperature set value, the control mode of the outside air cooling is selected. The above operation is the operation of the air conditioning system of FIG. 5 when the method disclosed in Patent Document 3 is applied.

JP 2003-148790 A Japanese Patent No. 3334073 JP 2005-172283 A

  When the method disclosed in Patent Document 3 is applied, the room temperature is in the vicinity of the temperature set value and the control mode is easily switched (the outside air damper has the maximum opening, and the heat exchange section of the individual air conditioner has the minimum Output), there is a problem that switching of the control mode is likely to occur frequently depending on conditions. This frequent switching of the control mode also leads to frequent changes in the occupant's sensible temperature, leading to discomfort. For the purpose of air conditioning, it can be said that the efficiency of control is reduced. Moreover, it will also lead to frequent start / stop of the fans of the individual air conditioners, leading to a reduction in equipment life.

  The present invention has been made to solve the above-described problems, and in an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination, efficiency reduction due to frequent switching between control by the individual air conditioner and control by the outside air cooling. It is an object to provide a control device and a control method that can be reduced.

The present invention is a control device for an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination, and an outside air cooling control mode for controlling room temperature by increasing or decreasing the effect of the outside air cooler, and an individual air conditioner Control mode selection switching judgment means for switching between individual air conditioning control modes for controlling the room temperature by increasing or decreasing the effect, and operating the outside air damper in the outside air cooling control mode to increase or decrease the effect of the outside air cooler And an outside air damper control calculation means for fixing the opening degree of the outside air damper during the control mode of the individual air conditioning, and the operation of the individual air conditioner is stopped during the control mode of the outside air cooling. and effects heat exchange unit control operation unit to increase or decrease the of the individual air conditioner by operating the output of the heat exchange portion of the individual air conditioners, a time lag when switching the control mode L Calculated and a variable time lag calculation means for setting the control mode selection switching determination unit, wherein the control mode selection switching determining means, the output of the heat exchange section of the individual air conditioner wherein the outdoor air damper is in the maximum opening degree is minimum When the room temperature becomes higher than the room temperature set value when the state becomes, the control mode of the individual air conditioning is selected, the outside air damper is at the maximum opening degree, and the output of the heat exchange unit of the individual air conditioner is the lowest. when it is a state, when the room temperature falls below room temperature set value, selects the control mode of the outdoor air cooling, the time lag L provided in switching the control mode, the variable time lag calculation means, the outside air those based on the difference in temperature and room temperature to estimate the difference in the cooling capacity of the individual air conditioner and the outside air-conditioner, wherein the longer the time lag L smaller the difference in the cooling capacity is large A.

Moreover , in one configuration example of the control device of the present invention, the variable time lag calculating means calculates a room temperature decrease rate K (X) at the time of a high opening degree operation near the maximum opening degree of the outside air damper between the room temperature and the outside air temperature. Each difference X is stored in advance as the cooling capacity of the outside air cooler, and the room temperature decrease rate H at the time of low output operation in the vicinity of the minimum output of the heat exchanger of the individual air conditioner is previously stored as the cooling capacity of the individual air conditioner. The time lag L is stored, and the time lag L is calculated by L = β | H−K (X) | (β> 0).

Further, the control device of the present invention includes an outside air cooling control mode for controlling the room temperature by increasing / decreasing the effect of the outside air cooler, and an individual air conditioning control mode for controlling the room temperature by increasing / decreasing the effect of the individual air conditioner. Control mode selection switching determining means for switching between, and operating the opening degree of the outside air damper in the outside air cooling control mode to increase or decrease the effect of the outside air cooler, and the opening degree of the outside air damper in the individual air conditioning control mode The outside air damper control calculation means to be fixed, and the operation of the individual air conditioner is stopped in the outside air cooling control mode, and the output of the heat exchange unit of the individual air conditioner is operated in the individual air conditioning control mode to operate the individual air conditioning Heat exchanger control calculation means for increasing or decreasing the effect of the machine, and control mode selection switching determination by calculating the control mode switching threshold hysteresis γ (γ> 0) And a variable hysteresis calculating means for setting the device, the control mode selection switching determining means, when the output of the heat exchange section of the individual air conditioners becomes minimum state before Kigaiki damper maximum opening degree, When the room temperature is higher than (room temperature set value + γ), the control mode of the individual air conditioning is selected, the outside air damper is at the maximum opening, and the output of the heat exchange unit of the individual air conditioner is in the lowest state When the room temperature is equal to or less than (room temperature set value−γ), the control mode of the outside air cooling is selected, and the variable hysteresis calculating means is connected to the outside air cooler based on the difference between the outside air temperature and the room temperature. A difference in cooling capacity of the air conditioner is estimated, and the hysteresis γ is increased as the difference in cooling capacity increases .

Further , in one configuration example of the control device of the present invention, the variable hysteresis calculating means calculates a room temperature decrease rate K (X) at the time of a high opening degree operation near the maximum opening degree of the outside air damper between a room temperature and an outside air temperature. Each difference X is stored in advance as the cooling capacity of the outside air cooler, and the room temperature decrease rate H at the time of low output operation in the vicinity of the minimum output of the heat exchanger of the individual air conditioner is previously stored as the cooling capacity of the individual air conditioner. And storing the hysteresis γ by γ = ζ | H−K (X) | (ζ> 0).

The control method of the present invention includes an outside air cooling control mode for controlling the room temperature by increasing or decreasing the effect of the outside air cooler, and an individual air conditioning control mode for controlling the room temperature by increasing or decreasing the effect of the individual air conditioner. Control mode selection switching determination procedure for switching between, and operating the outside air damper in the outside air cooling control mode to increase or decrease the effect of the outside air cooler, the opening degree of the outside air damper in the individual air conditioning control mode The outside air damper control calculation procedure to be fixed, the operation of the individual air conditioner is stopped during the control mode of the outside air cooling, and the output of the heat exchange unit of the individual air conditioner is operated during the control mode of the individual air conditioning to operate the individual air conditioning It includes a heat exchange unit control algorithm to increase or decrease the effect of the machine, and a variable time lag calculation procedure for calculating a time lag L when switching the control mode, the control mode When the room temperature becomes higher than the room temperature set value when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is at the lowest state, Control mode, and when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is at a minimum state, when the room temperature falls below the room temperature set value, the outside air cooling select control mode, the provided the time lag L when switching the control mode, the variable time lag calculating procedure estimates the difference in the cooling capacity of the individual air conditioner and the outside air-conditioner based on the difference of the outside air temperature and room temperature However, the time lag L is lengthened as the difference in cooling capacity increases .

The control method of the present invention includes an outside air cooling control mode for controlling the room temperature by increasing or decreasing the effect of the outside air cooler, and an individual air conditioning control mode for controlling the room temperature by increasing or decreasing the effect of the individual air conditioner. Control mode selection switching determination procedure for switching between, and operating the outside air damper in the outside air cooling control mode to increase or decrease the effect of the outside air cooler, the opening degree of the outside air damper in the individual air conditioning control mode The outside air damper control calculation procedure to be fixed, the operation of the individual air conditioner is stopped during the control mode of the outside air cooling, and the output of the heat exchange unit of the individual air conditioner is operated during the control mode of the individual air conditioning to operate the individual air conditioning A heat exchanger control calculation procedure for increasing or decreasing the effect of the machine, and a variable hysteresis calculation procedure for calculating a hysteresis γ (γ> 0) of the threshold value for switching the control mode; Wherein the said control mode selection switching determination procedure, when the output of the heat exchange section of the individual air conditioner before Kigaiki damper at the maximum opening degree becomes lowest state, room temperature is higher than (room temperature set value + gamma) When the control mode of the individual air conditioning is selected and the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, −γ), the control mode of the outside air cooling is selected, and the variable hysteresis calculation procedure estimates the difference in the cooling capacity between the outside air cooler and the individual air conditioner based on the difference between the outside air temperature and the room temperature. However, the hysteresis γ is increased as the difference in cooling capacity increases .

  According to the present invention, when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the control mode of the individual air conditioning is set when the room temperature becomes higher than the room temperature set value. When the outdoor air damper is at the maximum opening and the output of the heat exchanger of the individual air conditioner is at its lowest state, if the room temperature falls below the room temperature set value, select the control mode for the outdoor air cooling, and this Thus, by providing the time lag L when switching the control mode, it is possible to reduce the frequency of switching the control mode, and it is possible to reduce a decrease in control efficiency due to frequent switching of the control mode. Moreover, in this invention, the frequent change of a resident's sensible temperature can be prevented, and a resident's discomfort can be reduced. Furthermore, in the present invention, the frequency of the fans of the individual air conditioners can be reduced, and the deterioration of the equipment life due to frequent start / stop can be avoided.

  Further, in the present invention, the difference in the cooling capacity between the outside air cooler and the individual air conditioner is estimated based on the difference between the outside air temperature and the room temperature, and the time lag L is increased as the difference in the cooling capacity increases, thereby Reduction in switching frequency can be realized more effectively.

  In the present invention, when the hysteresis of the threshold value for switching the control mode is γ (γ> 0), the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state. When the room temperature is higher than (room temperature set value + γ), the individual air conditioning control mode is selected, the outside air damper is at the maximum opening, and the output of the heat exchanger of the individual air conditioner is in the lowest state Sometimes, when the room temperature becomes (room temperature set value-γ) or less, the frequency of switching the control mode can be reduced by selecting the control mode of the outside air cooling, and the control by frequent switching of the control mode The reduction in efficiency can be reduced. Moreover, in this invention, the frequent change of a resident's sensible temperature can be prevented, and a resident's discomfort can be reduced. Furthermore, in the present invention, the frequency of the fans of the individual air conditioners can be reduced, and the deterioration of the equipment life due to frequent start / stop can be avoided.

  Further, in the present invention, the difference in the cooling capacity between the outside air cooler and the individual air conditioner is estimated based on the difference between the outside air temperature and the room temperature, and the hysteresis γ is increased as the difference in the cooling capacity is larger. Reduction in switching frequency can be realized more effectively.

It is a block diagram which shows the structure of the air conditioning system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the cooperation controller of the air conditioning system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the cooperation controller of the air conditioning system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the conventional air conditioning system by only an individual air conditioner. It is a figure which shows the structure of the air conditioning system which uses an individual air conditioner and an external air cooler together.

[Principle of Invention 1]
There may be a large difference in cooling capacity between the individual air conditioner and the outside air cooler. Hereinafter, in order to facilitate understanding, a simple numerical example will be described.
In the individual air conditioner, the cooling capacity of the heat exchange section is relatively stable. At the time of designing the air conditioning system, it is intended to ensure sufficient cooling capacity. For example, if the output of the heat exchanger is increased by 10% at around 25 ° C, the effect of lowering the room temperature by 1 ° C within a specific time can be stably obtained. Designed to be

  On the other hand, in the outside air cooler, the cooling capacity depends on the outside air temperature. For example, if the room temperature is 25 ° C. and the outside air is 5 ° C., the outside air is sufficiently cooler than the room temperature (temperature difference 20 ° C.), so increasing the opening degree of the outside air damper by 10% has the effect of lowering the room temperature by 3 ° C. Shall be obtained. If the outside air is 23 ° C under the same conditions, the outside air is cooler than the room temperature, so it is theoretically possible to cool the outside air, but the temperature difference between the room temperature and the outside air is 2 ° C. Only the effect of lowering the room temperature by 0.3 ° C., which is 10% of the above, is obtained.

  That is, in the above numerical examples, the outside air cooler may have a cooling capacity three times that of the individual air conditioner or may be 1/3 of the cooling capacity. That is, even if the individual air conditioner and the outside air cooler operate as the same cooling equipment, the cooling capacity difference is not stable.

  In this way, when the difference in cooling capacity between the individual air conditioner and the outside air cooler is not stable, the room temperature is close to the temperature setting value and the control mode can be easily switched (the outside air damper has the maximum opening, individual air conditioning When the heat exchange section of the machine reaches the minimum output), the room temperature change rate greatly fluctuates with the switching of the control mode. Since the change in the room temperature change rate leads to an unstable change in the room temperature, the room temperature is moved up and down, and the up and down movement is also connected to the switching of the control mode. Therefore, switching of the control mode is likely to occur frequently. Frequent switching of the control mode also leads to frequent changes in the occupant's sensible temperature, leading to discomfort. For the purpose of air conditioning, it can be said that the efficiency of control is reduced. Moreover, it will also lead to frequent start / stop of the fans of the individual air conditioners, leading to a reduction in equipment life.

  The inventor pays attention to the fact that the efficiency of control can be reduced in this way, and it is effective to provide a time lag in order to reduce the frequency of switching in switching between the control mode of the outside air cooling and the individual air conditioning. I came up with it. In particular, it is more preferable to make the time lag time variable in consideration of the difference in cooling capacity between the outside air cooler and the individual air conditioner.

[Principle of Invention 2]
The inventor has conceived that, as a solution different from the principle 1 of the invention, it is effective to provide a hysteresis for the switching threshold in switching between the control modes of the outside air cooling and the individual air conditioning. In particular, it is more preferable to make the hysteresis width variable in consideration of the difference in cooling capacity between the outside air cooler and the individual air conditioner.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an air conditioning system according to the first embodiment of the present invention. This embodiment corresponds to Principle 1 of the invention described above. Since the arrangement of each component of the air conditioning system except for the cooperation controllers 1-1 and 1-2, which will be described later, is as shown in FIG. 5, the air conditioning system of the present embodiment will be described using the reference numerals in FIG.

The individual air conditioners 101-1 and 101-2 have heat exchange units 112-1 and 112-2 and heat exchange units 112-1 and 112 that cool or heat the return air from the rooms 100-1 and 100-2, respectively. -2 and fans 113-1 and 113-2 for sending out the cooled or heated supply air.
The outside air cooler 105 has a fan 114 for sending outside air.

  The cooperation controller 1-1 which is a control device of the air conditioning system controls the output of the heat exchange unit 112-1 of the individual air conditioner 101-1, the opening degree of the outside air damper 108-1, and the like, for example, thereby controlling the room 100-1. The room temperature is controlled to be the room temperature set value set by the resident. Similarly, the cooperation controller 1-2 controls the output of the heat exchange unit 112-2 of the individual air conditioner 101-2, the opening degree of the outside air damper 108-2, and the like so that the room temperature of the room 100-2 is set indoors. Control to be a value. The outputs of the heat exchange units 112-1 and 112-2 of the individual air conditioners 101-1 and 101-2 are determined by the amount of cold water supplied to the heat exchange units 112-1 and 112-2. Therefore, the cooperation controllers 1-1 and 1-2 control the outputs of the heat exchange units 112-1 and 112-2 by controlling the amount of the cold water.

  FIG. 2 is a block diagram showing the configuration of the cooperation controllers 1-1 and 1-2. Each of the cooperation controllers 1-1 and 1-2 is measured by the outside air temperature measurement value acquisition unit 10 that acquires the outside air temperature measurement value measured by the outside air temperature sensor 111 and the room temperature sensors 110-1 and 110-2. A room temperature measurement value / setting value acquisition unit 11 for acquiring room temperature measurement values of the rooms 100-1 and 100-2 and acquiring a room temperature setting value set by a resident of the rooms 100-1 and 100-2; A heat exchange control unit 12 that increases or decreases the effects of the individual air conditioners 101-1 and 101-2 by operating the outputs of the heat exchange units 112-1 and 112-2 in the individual air-conditioning control mode, and control of the outside air cooling An outside air damper control calculation unit 13 that increases or decreases the effect of the outside air cooler 105 by operating the opening degree of the outside air dampers 108-1 and 108-2 in the mode, the outside air cooler 105, and the individual air conditioner 101-1. Based on the difference in cooling capacity of 101-2, a variable time lag calculation unit 14 that calculates a time lag when switching the control mode, and a control mode selection switching determination unit 15 that switches between the control mode of the outside air cooling and the control mode of the individual air conditioning. And have.

  Hereinafter, the operation of the cooperation controllers 1-1 and 1-2 according to the present embodiment will be described. Here, the operation of the cooperation controller 1-1 will be described, but the operation of the cooperation controller 1-2 is the same except that the target room changes. Here, only cooling will be described, and it is assumed that heating by outside air is not performed.

The outside temperature measured value acquisition unit 10 of the cooperation controller 1-1 acquires the outside temperature measured value measured by the outside temperature sensor 111.
The room temperature measurement value / setting value acquisition unit 11 of the cooperation controller 1-1 acquires the room temperature measurement value measured by the room temperature sensor 110-1 and also acquires the room temperature setting value set by the resident.

  When the outside air temperature measurement value is equal to or greater than (room temperature set value−α) (α is a margin, for example, 2 ° C.), the control mode selection switching determination unit 15 of the cooperation controller 1-1 determines that the outside air cooling is not effective. Then, the control mode of the individual air conditioning is selected, and the room temperature is controlled only by the individual air conditioner 101-1. In the control mode of the individual air conditioning, the heat exchange unit control calculation unit 12 performs, for example, PID control calculation so that the room temperature measurement value input from the room temperature measurement value / set value acquisition unit 11 matches the room temperature set value. An operation amount instruction value is calculated, and the operation amount instruction value is output to the heat exchanging unit 112-1 of the individual air conditioner 101-1. Thus, the amount of cold water supplied to the heat exchange unit 112-1 is controlled according to the operation amount instruction value, whereby the output of the heat exchange unit 112-1 is controlled and room temperature control is executed. That is, in this case, the heat exchange unit 112-1 becomes a control actuator. At this time, the outside air damper control calculation unit 13 fixes the outside air damper 108-1 at an opening required for ventilation.

  Further, when the outside air temperature measurement value is less than (room temperature set value−α) and the outside air damper 108-1 is fixed at the maximum opening, the control mode selection switching determination unit 15 determines that the room temperature becomes higher than the room temperature set value. If it is determined, it is determined that the outside air cooling is effective, but it is necessary to use the individual air conditioner 101-1, and the control mode of the individual air conditioner is selected to control the room temperature only by the individual air conditioner 101-1. State. The operation of the heat exchange unit control calculation unit 12 is as described above. The outside air damper control calculation unit 13 fixes the outside air damper 108-1 at the maximum opening.

  Further, when the outside air temperature measurement value is less than (room temperature set value−α) and the outside air damper 108-1 is fixed at the maximum opening, the control mode selection switching determination unit 15 determines that the room temperature becomes equal to or less than the room temperature set value. If it is determined, it is determined that the outside air cooling is effective, the outside air cooling control mode is selected, and the room temperature is controlled only by the outside air cooler 105. In the control mode of the outside air cooling, the outside air damper control calculation unit 13 performs, for example, a PID control calculation so that the room temperature measurement value input from the room temperature measurement value / set value acquisition unit 11 matches the room temperature set value. The amount instruction value is calculated, and the operation amount instruction value is output to the outside air damper 108-1. Thus, by controlling the opening degree of the outside air damper 108-1 according to the operation amount instruction value, the outside air supply amount is controlled, and the room temperature control is executed. That is, in this case, the outside air damper 108-1 becomes a control actuator. At this time, the heat exchange unit control calculation unit 12 minimizes the output of the heat exchange unit 112-1, and stops the individual air conditioner 101-1.

  As described above, when the outside air damper 108-1 is at the maximum opening and the output of the heat exchanging unit 112-1 of the individual air conditioner 101-1 is in the lowest state, the determination point for selection (switching) of the control mode is made. . At this determination point, if the control mode selection switching determination unit 15 determines that the room temperature becomes higher than the room temperature setting value even if the outside air damper 108-1 is fixed at the maximum opening, the control mode of the individual air conditioning is set. When it is selected and it is determined that the room temperature is equal to or lower than the room temperature set value, the control mode of the outside air cooling is selected.

  Specifically, in the state of only the outside air cooling (complete outside air cooling), the output of the heat exchanging unit 112-1 of the individual air conditioner 101-1 is the lowest (a state where the output is completely stopped and the output is zero). In this case, the room temperature is controlled by the feedback control system that operates the opening degree of the outside air damper 108-1 as described above. When heat generation in the room increases and the intake amount of the outside air has to be increased, the outside air damper control calculation unit 13 increases the opening degree of the outside air damper 108-1. When the outside air damper 108-1 reaches the maximum opening degree, it has reached the limit of cooling capacity only by outside air cooling. At this time, the outside air damper 108-1 is at the maximum opening and the output of the heat exchanging unit 112-1 of the individual air conditioner 101-1 is in the lowest state, that is, the control mode switching determination point.

  The control mode selection switching determination unit 15 continues the control mode of the outside air cooling if the outside air damper 108-1 reaches the maximum opening and the state where the room temperature matches the room temperature set value can be maintained. Even if the outside air damper 108-1 reaches the maximum opening degree, if the room temperature is higher than the room temperature set value, the cooling capacity is insufficient, so the control mode selection switching determination unit 15 selects the control mode for individual air conditioning. Therefore, the individual air conditioner 101-1 is used. By switching to the control mode of the individual air conditioning, the room temperature is controlled by the feedback control system that operates the output of the heat exchange unit 112-1 as described above.

  When the control of the room temperature by the individual air conditioner 101-1 starts, the output of the heat exchange unit 112-1 of the individual air conditioner 101-1 increases and is not the lowest. The increase in output here means that the amount of cold water supplied to the heat exchanging unit 112-1 increases and the cooling capacity of the individual air conditioner 101-1 increases. On the other hand, the outside air damper 108-1 is in the maximum opening degree. However, when the heat generation in the room is reduced and the cooling capacity can be sufficiently secured only with the outside air, the outside air damper 108-1 has the maximum opening and the output of the heat exchange unit 112-1 of the individual air conditioner 101-1. It becomes the lowest state, that is, a judgment point for switching the control mode.

  If the output of the heat exchange unit 112-1 of the individual air conditioner 101-1 becomes the lowest when the room temperature becomes higher than the room temperature set value, the control mode selection switching determination unit 15 controls the control mode of the individual air conditioning. Continue. Even if the output of the heat exchanging unit 112-1 of the individual air conditioner 101-1 becomes the lowest, if the state where the room temperature matches the room temperature setting value can be maintained, only the cooling by the outside air is required. The unit 15 selects the control mode for the outside air cooling. By switching to the control mode of the outside air cooling, the room temperature is controlled by a feedback control system that operates the opening degree of the outside air damper 108-1.

  Since the above operation is switching from cooling to cooling, unlike the switching of cooling / heating control, it is unlikely that the room temperature moves up and down due to the switching. However, as described above, since the cooling capacity of the outside air cooling changes extremely depending on the outside air temperature, it is difficult to match the room temperature to the room temperature setting value depending on the situation even when switching from cooling to cooling. Sometimes. For example, when the opening degree of the outside air damper 108-1 cannot be precisely operated near a high opening degree, the operation of the damper opening degree itself becomes an element of the fluctuation of the room temperature. Considering the possibility that this inaccurate operation of the damper opening occurs in the vicinity of the judgment point for switching the control mode, it is often said that the individual air conditioner 101-1 is frequently started and stopped. It is easy to lead to "shortening of mechanical component life".

  Therefore, in the present embodiment, the time lag L [min. ] Is provided. The purpose of providing the time lag L is not to stabilize the room temperature with high accuracy, but simply to reduce the frequency of starting and stopping of the individual air conditioner 101-1. Furthermore, in the present embodiment, a variable method is adopted that takes a long time lag L when the difference in cooling capacity between the outside air cooler 105 and the individual air conditioner 101-1 is large in switching from cooling to cooling. Specifically, the difference in the cooling capacity between the outside air cooler 105 and the individual air conditioner 101-1 is estimated based on the difference between the outside air temperature and the room temperature, and the time lag L becomes longer as the difference in the cooling capacity is larger.

  In order to calculate the time lag L, the cooling capacity of the individual air conditioner 101-1 is grasped in advance. For example, assuming that the output of the heat exchanging unit 112-1 is normalized by 0 to 100%, an approximate value H [° C./min. ]. Specifically, for example, an approximate value H of the room temperature decrease rate when the output of the heat exchange unit 112-1 is changed from 0% to 10% is obtained. Thus, when grasping | ascertaining the air_conditioning | cooling capability of the separate air conditioner 101-1, about the external air damper 108-1, it fixes with the maximum opening degree. And the room temperature fall rate H is preset in the variable time lag calculation part 14 as the cooling capacity of the individual air conditioner 101-1.

  In addition, the cooling capacity of the outside air cooler 105 is also grasped in advance. For example, assuming that the opening degree of the outside air damper 108-1 is normalized by 0 to 100%, an approximate value K [° C./min. ]. Specifically, for example, an approximate value K of the room temperature decrease rate when the opening degree of the outside air damper 108-1 is changed from 90% to 100% is obtained. The room temperature decrease rate K is ascertained for each case where the difference X = D−A [° C.] between the room temperature D [° C.] and the outside air temperature A [° C.] has various values. Temperature drop rate K (X) [° C./min. ]. Thus, when grasping | ascertaining the cooling capability of the external air cooler 105, operation | movement is stopped about the individual air conditioner 101-1. Then, the room temperature decrease rate K (X) is preset in the variable time lag calculation unit 14 as the cooling capacity of the outside air cooler 105.

The variable time lag calculation unit 14 obtains the room temperature outside air temperature difference X from the current room temperature D [° C.] and the current outside air temperature A [° C.], and the room temperature falling rate K according to the room temperature falling rate H and the room temperature outside air temperature difference X. (X) and time lag L [min. ] Is calculated as follows:
L = β | H−K (X) | (1)
In formula (1), β (β> 0) is a predetermined proportionality coefficient. The variable time lag calculation unit 14 sets the calculated time lag L in the control mode selection switching determination unit 15.

Since the purpose of the time lag L is simply to reduce the frequency of on / off of the individual air conditioner 101-1, no special provision is required for how to determine the proportionality coefficient β. It is sufficient that the control mode is switched with sufficient time.
For example, the variable time lag calculation unit 14 calculates the time lag L when at least one of the room temperature D and the outside air temperature A changes, or calculates the time lag L at regular intervals, so that the time lag L is appropriately updated. To.

  The control mode selection switching determination unit 15 provides the time lag L calculated by the variable time lag calculation unit 14 when switching the control mode as described above. That is, when it is determined to switch the control mode, the control mode is switched to the selected control mode after waiting for the time lag L.

  As described above, in the present embodiment, by providing a time lag for switching the control mode, the frequency of switching the control mode can be reduced, and a decrease in control efficiency due to frequent switching of the control mode is reduced. be able to. Moreover, in this Embodiment, the frequent change of a resident's sensible temperature can be prevented and a resident's discomfort can be reduced. Furthermore, in this Embodiment, the frequency of the start / stop of the fan of an individual air conditioner can be reduced, and the fall of the apparatus lifetime by frequent start / stop can be avoided. Further, in the present embodiment, the frequency of control mode switching can be reduced more effectively by increasing the time lag as the difference in cooling capacity between the outside air cooler and the individual air conditioner increases.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. This embodiment corresponds to Principle 2 of the invention described above. Also in the present embodiment, the configuration of the air conditioning system is the same as that of the first embodiment, and therefore will be described using the reference numerals in FIG.

  FIG. 3 is a block diagram illustrating the configuration of the cooperation controllers 1-1 and 1-2 according to the present embodiment. Each of the cooperation controllers 1-1 and 1-2 includes an outside air temperature measurement value acquisition unit 10, a room temperature measurement value / setting value acquisition unit 11, a heat exchange unit control calculation unit 12, and an outside air damper control calculation unit 13, respectively. The control mode selection switching determination unit 15a and the variable hysteresis calculation for calculating the hysteresis of the threshold value for switching the control mode based on the difference in cooling capacity between the outside air cooler 105 and the individual air conditioners 101-1 and 101-2. Part 16.

  In the present embodiment, for the same reason as in the first embodiment, a hysteresis γ [° C.] (γ> 0) is provided for the threshold value for switching the control mode. That is, when the control mode selection switching determination unit 15a determines that the room temperature is higher than (room temperature set value + γ) even when the outside air damper 108-1 reaches the maximum opening degree during the outside air cooling control mode, Switch to individual air conditioning control mode. Further, the control mode selection switching determination unit 15a sets the room temperature (room temperature set value−γ) when the output of the heat exchange unit 112-1 of the individual air conditioner 101-1 becomes the lowest during the control mode of the individual air conditioning. When it is determined that the following will occur, the control mode is switched to the outside air cooling control mode.

  Further, in the present embodiment, the difference in the cooling capacity between the outside air cooler 105 and the individual air conditioner 101-1 is estimated based on the difference between the outside air temperature and the room temperature, and the hysteresis γ increases as the difference in the cooling capacity increases. To.

  Similar to the variable time lag calculation unit 14 of the first embodiment, the variable hysteresis calculation unit 16 is preset with the room temperature decrease rate H as the cooling capacity of the individual air conditioner 101-1, and the room temperature decrease rate K (X). Is preset as the cooling capacity of the outside air cooler 105.

The variable hysteresis calculation unit 16 obtains a room temperature outside air temperature difference X = DA [° C.] from the current room temperature D [° C.] and the current outside air temperature A [° C.], and the room temperature decrease rate H and the room temperature outside air temperature difference X Hysteresis γ [° C.] is calculated using the room temperature decrease rate K (X) according to the following equation.
γ = ζ | H−K (X) | (2)
In equation (2), ζ (ζ> 0) is a predetermined proportionality coefficient. The variable hysteresis calculation unit 16 sets the calculated hysteresis γ in the control mode selection switching determination unit 15a.

Hysteresis γ is simply for the purpose of reducing the frequency of on / off of the individual air conditioner 101-1, so no special provision is required for how to determine the proportionality coefficient ζ. It is sufficient that the control mode is switched with sufficient time.
The variable hysteresis calculation unit 16 calculates the hysteresis γ when, for example, at least one of the room temperature D and the outside air temperature A changes, or calculates the hysteresis γ at regular intervals so that the hysteresis γ is appropriately updated. To.

  Other configurations of the air conditioning system are as described in the first embodiment. Thus, in this embodiment, the same effect as that of the first embodiment can be obtained.

  The cooperation controllers 1-1 and 1-2 according to the first and second embodiments can be realized by a computer having a CPU, a storage device, and an interface, and a program for controlling these hardware resources. it can. The CPU executes the processing described in the first and second embodiments in accordance with a program stored in the storage device.

  The present invention can be applied to an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination.

  1-1, 1-2 ... cooperation controller, 10 ... outside air temperature measurement value acquisition unit, 11 ... room temperature measurement value / set value acquisition unit, 12 ... heat exchange unit control calculation unit, 13 ... outside air damper control calculation unit, 14 ... Variable time lag calculation unit, 15... Control mode selection switching determination unit, 16... Variable hysteresis calculation unit, 101-1, 101-2, individual air conditioner, 102-1, 102-2, return air duct, 103-1 and 103. -2 ... Air supply duct, 104-1, 104-2 ... Air supply outlet, 105 ... Outside air cooler, 106 ... Outside air inlet, 107-1,107-2 ... Outside air duct, 108-1,108 -2 ... Outside air damper, 109-1, 109-2 ... Outside air outlet, 110-1,110-2 ... Room temperature sensor, 111 ... Outside air temperature sensor, 112-1,112-2 ... Heat exchange section, 113- 1, 113-2, 114 ... § down.

Claims (8)

A control device for an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination.
Control mode selection switching determination means for switching between an outside air cooling control mode for controlling the room temperature by increasing / decreasing the effect of the outside air cooler and an individual air conditioning control mode for controlling the room temperature by increasing / decreasing the effect of the individual air conditioner; ,
Operating the outside air damper during the outside air cooling control mode to increase or decrease the effect of the outside air cooler, and the outside air damper control calculating means for fixing the outside air damper opening during the individual air conditioning control mode;
A heat exchanging unit that stops the operation of the individual air conditioner during the control mode of the outside air cooling, and operates the output of the heat exchanging unit of the individual air conditioner during the control mode of the individual air conditioning to increase or decrease the effect of the individual air conditioner Control arithmetic means ;
Variable time lag calculating means for calculating a time lag L when switching the control mode and setting the time lag L in the control mode selection switching determining means ,
When the room temperature becomes higher than the room temperature setting value when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the control mode selection switching determination unit, When the control mode of the individual air conditioning is selected, and the room temperature falls below the room temperature set value when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the outside air select cooling control mode, the time lag L provided in switching the control mode,
The variable time lag calculating means estimates the difference in cooling capacity between the outside air cooler and the individual air conditioner based on the difference between the outside air temperature and the room temperature, and increases the time lag L as the difference in the cooling capacity increases. Control device characterized. The control device according to claim 1 ,
The variable time lag calculating means preliminarily calculates a room temperature decrease rate K (X) during a high opening operation near the maximum opening of the outside air damper as a cooling capacity of the outside air cooler for each difference X between the room temperature and the outside air temperature. And storing the room temperature decrease rate H at the time of low power operation near the lowest output of the heat exchanger of the individual air conditioner in advance as the cooling capacity of the individual air conditioner, and the time lag L as L = β | H− A control device characterized by calculating by K (X) | (β> 0). A control device for an air conditioning system in which an individual air conditioner and an outside air cooler are used in combination.
Control mode selection switching determination means for switching between an outside air cooling control mode for controlling the room temperature by increasing / decreasing the effect of the outside air cooler and an individual air conditioning control mode for controlling the room temperature by increasing / decreasing the effect of the individual air conditioner; ,
Operating the outside air damper during the outside air cooling control mode to increase or decrease the effect of the outside air cooler, and the outside air damper control calculating means for fixing the outside air damper opening during the individual air conditioning control mode;
A heat exchanging unit that stops the operation of the individual air conditioner during the control mode of the outside air cooling, and operates the output of the heat exchanging unit of the individual air conditioner during the control mode of the individual air conditioning to increase or decrease the effect of the individual air conditioner Control arithmetic means ;
Variable hysteresis calculating means for calculating the control mode switching threshold hysteresis γ (γ> 0) and setting it in the control mode selection switching determining means ;
The control mode selecting switch determining unit, when the output of the heat exchange section of the individual air conditioner before Kigaiki damper at the maximum opening degree becomes lowest state, is higher than room temperature (room temperature set value + gamma) If the control mode of the individual air conditioning is selected, and the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the room temperature is (room temperature set value−γ) In the following cases, select the outside air cooling control mode ,
The variable hysteresis calculating means estimates a difference in cooling capacity between the outside air cooler and the individual air conditioner based on a difference between the outside air temperature and room temperature, and increases the hysteresis γ as the difference in the cooling capacity increases. Control device characterized. The control device according to claim 3 ,
The variable hysteresis calculating means preliminarily calculates a room temperature decrease rate K (X) at the time of a high opening degree operation near the maximum opening degree of the outside air damper as a cooling capacity of the outside air cooler for each difference X between the room temperature and the outside air temperature. And storing in advance the room temperature decrease rate H at the time of low power operation near the lowest output of the heat exchanger of the individual air conditioner as the cooling capacity of the individual air conditioner, and the hysteresis γ is expressed as γ = ζ | H− A control device that calculates by K (X) | (ζ> 0). An air conditioning system control method in which an individual air conditioner and an outside air cooler are used together,
Control mode selection switching judgment procedure for switching between an outside air cooling control mode for controlling the room temperature by increasing or decreasing the effect of the outside air cooler and an individual air conditioning control mode for controlling the room temperature by increasing or decreasing the effect of the individual air conditioner ,
An outside air damper control calculation procedure for increasing or decreasing the effect of the outside air cooler by operating the opening degree of the outside air damper during the outside air cooling control mode, and fixing the outside air damper opening degree during the individual air conditioning control mode;
A heat exchanging unit that stops the operation of the individual air conditioner during the control mode of the outside air cooling, and operates the output of the heat exchanging unit of the individual air conditioner during the control mode of the individual air conditioning to increase or decrease the effect of the individual air conditioner Control calculation procedure ;
A variable time lag calculation procedure for calculating a time lag L when switching the control mode,
In the control mode selection switching determination procedure, when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the room temperature becomes higher than the room temperature set value, When the control mode of the individual air conditioning is selected, and the room temperature falls below the room temperature set value when the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the outside air select cooling control mode, the time lag L provided in switching the control mode,
The variable time lag calculation procedure estimates the difference in cooling capacity between the outside air cooler and the individual air conditioner based on the difference between the outside air temperature and room temperature, and increases the time lag L as the difference in the cooling capacity increases. Characteristic control method. The control method according to claim 5 , wherein
In the variable time lag calculation procedure, the room temperature decrease rate K (X) at the time of a high opening degree operation near the maximum opening degree of the outside air damper is preliminarily set as the cooling capacity of the outside air cooler for each difference X between the room temperature and the outside air temperature. And storing the room temperature decrease rate H at the time of low power operation near the lowest output of the heat exchanger of the individual air conditioner in advance as the cooling capacity of the individual air conditioner, and the time lag L as L = β | H− A control method characterized by calculating by K (X) | (β> 0). An air conditioning system control method in which an individual air conditioner and an outside air cooler are used together,
Control mode selection switching judgment procedure for switching between an outside air cooling control mode for controlling the room temperature by increasing or decreasing the effect of the outside air cooler and an individual air conditioning control mode for controlling the room temperature by increasing or decreasing the effect of the individual air conditioner ,
An outside air damper control calculation procedure for increasing or decreasing the effect of the outside air cooler by operating the opening degree of the outside air damper during the outside air cooling control mode, and fixing the outside air damper opening degree during the individual air conditioning control mode;
A heat exchanging unit that stops the operation of the individual air conditioner during the control mode of the outside air cooling, and operates the output of the heat exchanging unit of the individual air conditioner during the control mode of the individual air conditioning to increase or decrease the effect of the individual air conditioner Control calculation procedure ;
A variable hysteresis calculating procedure for calculating a hysteresis γ (γ> 0) of the threshold value for switching the control mode,
The control mode selection switching determination procedure, when the output of the heat exchange section of the individual air conditioner before Kigaiki damper at the maximum opening degree becomes lowest state, is higher than room temperature (room temperature set value + gamma) If the control mode of the individual air conditioning is selected, and the outside air damper is at the maximum opening and the output of the heat exchange unit of the individual air conditioner is in the lowest state, the room temperature is (room temperature set value−γ) In the following cases, select the outside air cooling control mode ,
The variable hysteresis calculation procedure estimates the difference in cooling capacity between the outside air cooler and the individual air conditioner based on the difference between the outside air temperature and room temperature, and increases the hysteresis γ as the difference in the cooling capacity increases. Characteristic control method. The control method according to claim 7 ,
In the variable hysteresis calculation procedure, the room temperature decrease rate K (X) at the time of a high opening degree operation near the maximum opening degree of the outside air damper is previously set as the cooling capacity of the outside air cooler for each difference X between the room temperature and the outside air temperature. And storing in advance the room temperature decrease rate H at the time of low power operation near the lowest output of the heat exchanger of the individual air conditioner as the cooling capacity of the individual air conditioner, and the hysteresis γ is expressed as γ = ζ | H− A control method characterized by calculating by K (X) | (ζ> 0).

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