JP2014059097A - Desiccant air conditioner system and its operational method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax a situation in which a dew point temperature hardly follows to a desired dew point temperature.SOLUTION: An increase side output value P1 is determined at a feed-back control calculation part (an increase side) 11. A decrease side output value P2 is determined at a feed-back control calculation part (a decrease side) 12. A changing speed of output of the increase side output value P1 is made faster than a changing speed of output of the decrease side output value P2 in reference to a difference of parameters when the PID calculation control is carried out. A changing direction of control value is determined at the control value changing direction determination part 13 on the basis of the increase side output value P1 and the decrease side output value P2 and a result of determination is transferred to a control output value calculation part 14. When the control value changing direction is in an increase direction, the control output value calculating part 14 sets the increase side output value P1 as the control output value and when the control value changing direction is in a decrease direction, the control output value calculating part 14 sets the decrease side output value P2 as the control output value.

Description

  The present invention is arranged across the regeneration-side air flow path and the processing-side air flow path, and continuously rotates while absorbing moisture from the processing-side air and releasing moisture to the regeneration-side air. The present invention relates to a desiccant air conditioning system using a desiccant rotor to be performed and an operation method thereof.

  Conventionally, a desiccant air-conditioning system using a desiccant rotor has been adopted as an air-conditioner for keeping humidity low, such as a freezer warehouse and a battery factory.

  The desiccant rotor is formed in a disk shape and has a structure in which air can penetrate in the thickness direction. A solid adsorbate containing a porous inorganic compound as a main component is provided on the surface of the desiccant rotor. As the porous inorganic compound, a solid adsorbent having a pore diameter of about 0.1 to 20 nm and adsorbing moisture, for example, silica gel, zeolite, polymer adsorbent and the like is used. Further, the desiccant rotor is driven by a motor and rotates about the central axis, and continuously performs moisture absorption from the processing side air and moisture release to the regeneration side air.

  Conventionally, in a desiccant air conditioning system using this desiccant rotor, in order to reliably maintain the humidity (dew point temperature) of the air-conditioned space at the target humidity (target dew point temperature), the operation is based on the condition where the humidity load is maximum. The desiccant rotor is always in operation under the conditions (operating conditions that can achieve the highest performance). For this reason, the performance is too good in winter and the intermediate period, and the dew point temperature is lowered excessively than the target dew point temperature, and energy may be wasted.

  Therefore, in order to prevent such waste of energy, for example, in Patent Document 1, a dew point temperature sensor for detecting the dew point temperature of the air dehumidified by the desiccant rotor is provided, and the dew point temperature detected by the dew point temperature sensor is the target dew point. At least one of the flow rate of the air on the regeneration side, the number of revolutions of the desiccant rotor, and the heating capacity of the heating device that heats the air on the regeneration side is controlled so as to reach the temperature.

  In other words, the control output is controlled so that the dew point temperature detected by the dew point temperature sensor becomes the target dew point temperature, with at least one of the air flow rate on the regeneration side, the rotational speed of the desiccant rotor, and the heating capacity of the heating device being controlled. I give it to the target. By performing such dew point temperature control, energy saving can be realized without excessively lowering the dew point temperature from the target dew point temperature. Hereinafter, this dew point temperature control in which at least one of the regeneration-side air flow rate, the rotational speed of the desiccant rotor, and the heating capability of the heating device is controlled is referred to as capacity control.

Japanese Patent No. 3266326

  However, in such capacity control of a desiccant air conditioning system, the dew point temperature is unlikely to decrease when the control output increases, and the dew point temperature tends to increase when the control output decreases. There was a problem that it was difficult to follow.

  The present invention has been made to solve such a problem, and the object of the present invention is to provide a desiccant air-conditioning system capable of mitigating a situation in which the dew point temperature is difficult to follow the target dew point temperature, and an operating method thereof. Is to provide.

  In order to achieve such an object, the present invention provides a regeneration-side fan that forms a regeneration-side air flow, a processing-side fan that forms a treatment-side air flow, a downstream side of a regeneration-side air flow path, and A desiccant rotor that is arranged across the upstream side of the processing-side air flow path and continuously absorbs moisture from the processing-side air and releases moisture to the regeneration-side air, and before moisture absorption by the desiccant rotor A pre-cooling device that cools the air on the processing side and a heating device that heats the air on the regeneration side before moisture release by the desiccant rotor, and supplies the dry air on the processing side absorbed by the desiccant rotor to the air-conditioned space In the desiccant air conditioning system, the moisture amount detecting means for detecting the moisture amount at a predetermined position in the flow path through which the dry air on the processing side flows, the flow rate of the air on the regeneration side, the rotation of the desiccant rotor, A control value determining unit that determines at least one of the number and the heating capacity of the heating device as a control target, and determines a control value for the control target such that the water amount detected by the water amount detection unit becomes a target water amount; Control value change direction determining means for determining the change direction of the control value determined by the control value determining means, and control for calculating the control output value based on the change direction of the control value determined by the control value change direction determining means It is characterized by comprising output value calculation means and control output value output means for outputting the control output value calculated by the control output value calculation means to the controlled object.

  In capacity control of a desiccant air conditioning system, the dew point temperature is less likely to decrease when the control output increases, and the dew point temperature tends to increase when the control output decreases when the control output increases and when the control output decreases. This is because the dew point temperature change rate (dead time, time constant) is different. In the present invention, paying attention to such points, the change direction of the control value with respect to the control target is determined, the control output value (control output) is calculated based on the determined change direction of the control value, and output to the control target. To do.

  For example, in the present invention, increase / decrease / neutral is determined as the change direction of the control value, and different control output change speeds are realized when the control output increases and decreases. For example, when the change direction of the control value is an increase direction, the output change speed is made faster than in the decrease direction. That is, when the change direction of the control value is an increase direction, feedback control (increase feedback control) with a fast output change speed is performed, and when the change direction of the control value is a decrease direction, the output is changed. Perform feedback control (decrease-side feedback control) with a slow rate of change.

  In addition, when 2-feedback control (increasing feedback / decreasing feedback control) that realizes different output changing speeds when the control output increases and decreases, it is determined that the change direction of the control value is the decreasing direction. A control output smaller than the previous control output is output to the control target. However, since a strict dew point temperature control is required in a lithium ion factory or the like where a desiccant air conditioning system is used, it is desired to maintain “target dew point temperature ≧ measured dew point temperature” as much as possible. Therefore, it is desirable that the condition for determining the decreasing direction as the direction of change of the control value is stricter than the condition for determining the increasing direction or neutral. As a solution to such a point, in the present invention, when a state in which the change direction of the control value indicates a decreasing direction is maintained under a certain condition, for example, it is determined that it is continuously decreasing for a certain number of times, or there is When it is determined that the current value is decreasing for a certain period of time, the change direction of the control value is determined as the decreasing direction. By doing in this way, the condition judged to be a decreasing direction can be made stricter than the condition judged to be an increasing direction or neutral.

  According to the present invention, the change direction of the control value is determined, the control output value (control output) is calculated based on the determined change direction, and the calculated control output value is output to the control target. For example, when the change direction of the control value is an increase direction, feedback control (increase-side feedback control) with a fast control output change speed is performed, and when the change direction of the control value is a decrease direction Perform control such that the dew point temperature is less likely to follow the target dew point temperature, such as by performing feedback control (decrease-side feedback control) with a slow control output change rate, so that the dew point temperature follows the target dew point temperature as much as possible. It becomes possible to do.

It is a figure which shows the outline of one Embodiment of the desiccant air conditioning system which concerns on this invention. It is a functional block diagram (Embodiment 1) of the capacity | capacitance control which the controller in this desiccant air conditioning system has. 3 is a diagram illustrating a configuration of a control value change direction determination unit in the functional block according to Embodiment 1. FIG. It is a figure which shows the specific example of table TB1 used in Embodiment 1. FIG. It is a figure which shows the specific example of table TB2 used in Embodiment 1. FIG. It is a flowchart of the capacity | capacitance control which a controller performs. It is a figure which shows the specific example of table TB1 'used in Embodiment 2. FIG. It is a figure which shows the specific example of table TB2 'used in Embodiment 2. FIG. FIG. 10 is a functional block diagram of capacity control possessed by a controller (third embodiment). FIG. 10 is a diagram illustrating a configuration of a control value change direction determination unit in the functional block of the third embodiment. It is a figure which shows the specific example of table TB3 used in Embodiment 3. FIG. It is a figure which shows the specific example of table TB3 'used in Embodiment 4. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of an embodiment of a desiccant air conditioning system according to the present invention.

  In the figure, 100 is an air conditioner (desiccant air conditioner) that generates low-humidity air, 200 is a dry area (air-conditioned space) that receives the supply of low-humidity air from the desiccant air conditioner 100, and 300 is a desiccant. It is a controller that controls the operation of the air conditioner 100.

  The desiccant air conditioner 100 includes a regeneration-side fan (hereinafter referred to as a regeneration fan) 1 that forms a regeneration-side air flow, and a processing-side fan (hereinafter referred to as an air supply fan) 2 that forms a processing-side air flow. The desiccant rotor 3 disposed across the downstream side of the regeneration-side air flow path L1 and the upstream side of the processing-side air flow path L2, and the processing-side air before moisture absorption by the desiccant rotor 3 is cooled. A cold water coil (hereinafter referred to as a pre-cooling coil) 4 and a hot water coil (hereinafter referred to as a regeneration coil) 5 for heating the air on the regeneration side before moisture release by the desiccant rotor 3 are provided.

  In the desiccant air conditioner 100, the processing-side air that has passed through the purge region of the desiccant rotor 3 is returned to the air flow before the moisture release on the regeneration side to the desiccant rotor 3. This purge air flow is determined by consequence. Such a type of desiccant air conditioner 100 is called a circulation type desiccant air conditioner.

  S1 is a dew point temperature sensor for detecting the dew point temperature (supply air dew point temperature) tdpv of the air supplied from the desiccant air conditioner 100 to the dry area 200 (air on the processing side absorbed by the desiccant rotor 3) SA. A temperature sensor that measures the outlet temperature of the air cooled by the precooling coil 4 as the precooling coil outlet temperature tspv, S3 is a temperature sensor that measures the outlet temperature of the air heated by the regeneration coil 5 as the regeneration coil outlet temperature tr1pv, and S4 is a desiccant rotor. 3 is a temperature sensor that measures the outlet temperature of the regeneration side air that has been dehumidified by the rotor 3 as the rotor regeneration side outlet temperature tr2pv. S5 is the pressure of the supply air SA from the desiccant air conditioner 100 to the dry area 200, and the supply duct pressure Pspv. A pressure sensor that is measured as INV1 is an inverter for adjusting the rotational speed of the desiccant rotor 3, INV2 is an inverter for adjusting the rotational speed of the regeneration fan 1, INV3 is an inverter for adjusting the rotational speed of the air supply fan 2, VL1 is a cold water valve provided in a supply passage of the cold water CW to the precooling coil 4, VL <b> 2 is a hot water valve provided in the supply passage of the hot water HW to the regeneration coil 5.

[Processing side]
In this desiccant air conditioning system, the outside air OA taken in as processing-side air is cooled by the precooling coil 4 and sent to the desiccant rotor 3. When this air passes through the desiccant rotor 3, the moisture contained in the air is adsorbed (absorbed) by the solid adsorbent of the desiccant rotor 3. Then, the air after moisture absorption by the desiccant rotor 3, that is, the air dehumidified by the desiccant rotor 3, is supplied to the dry area 200 as the supply air SA from the desiccant air conditioner 100.

[Playback side]
On the other hand, on the regeneration side, the outside air OA or the return air RA from the dry area 200 is taken in as the regeneration side air, sent to the regeneration coil 5 and heated. As a result, the temperature of the outside air OA or the return air RA rises and the relative humidity is lowered. In this case, the outside air OA or the return air RA is set to a high temperature exceeding 100 ° C. Then, the high-temperature outside air OA or the return air RA with the relative humidity lowered is sent to the desiccant rotor 3 as regeneration air. The outside air OA or the return air RA may be used, and only the purge air flow from the desiccant rotor 3 may be used as the regeneration side air.

  The desiccant rotor 3 is rotating, and when the regeneration air having a low relative humidity passes through the solid adsorbent that has adsorbed moisture from the processing-side air, the moisture is desorbed from the solid adsorbent and is released into the regeneration air. Is done. The regeneration air that has absorbed moisture from the solid adsorbent is discharged as exhaust EA.

  During the processing of air on the processing side and the regeneration side, the controller 300 controls the rotation speed of the regeneration fan 1 (capacity control) so that the dew point temperature tdpv matches the target dew point temperature tdsp, and sets the regeneration coil outlet temperature tr1pv. The opening degree of the hot water valve VL2 is controlled so as to match the regeneration coil outlet temperature set value tr1sp (regeneration coil outlet temperature control), and the rotor regeneration side outlet temperature tr2pv is desiccant so as to coincide with the rotor regeneration side outlet temperature set value tr2sp. The number of rotations of the rotor 3 is controlled (rotor regeneration side outlet temperature control), and the opening degree of the chilled water valve VL1 is controlled so that the precooling coil outlet temperature tspv matches the precooling coil outlet temperature set value tssp (precooling coil outlet temperature control). Then, the rotation speed of the supply fan 2 is controlled (constant pressure control) so that the supply duct pressure Pspv matches the supply duct pressure set value Pssp.

  In this example, as the capacity control, the rotation speed of the regeneration fan 1 is controlled so that the dew point temperature tdpv matches the target dew point temperature tdsp. That is, the flow rate of the regeneration air is controlled. However, the rotational speed of the desiccant rotor 3 may be controlled, or the heating capability of the regenerative coil 5 may be controlled.

[Embodiment 1]
(Capacity control)
FIG. 2 is a functional block diagram of capacity control that the controller 300 has. The controller 300 is realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with these hardware. As a basic configuration of capacity control, an increase-side feedback control function BL1 and a decrease A side feedback control function BL2 and a control output function BL3 are provided.

  The increase side feedback control function BL1 includes a feedback control input unit 10 and a feedback control calculation unit (increase side) 11, and the decrease side feedback control function BL2 includes a feedback control input unit 10 and a feedback control calculation unit (decrease side) 12. And. In addition, in the increase side feedback control function BL1 and the decrease side feedback control function BL2, the feedback control input unit 10 is a common input unit, and the dew point temperature tdpv and the target dew point temperature tdsp are input.

  In the increase side feedback control function BL1, the feedback control calculation unit (increase side) 11 receives the dew point temperature tdpv and the target dew point temperature tdsp from the feedback control input unit 10, performs PID control calculation, and performs the regeneration fan 1 An adjustment value of the rotation speed (reproduction fan INV output) is obtained. In other words, a regeneration fan INV output that makes the dew point temperature tdpv coincide with the target dew point temperature tdsp is obtained, and this regeneration fan INV output is set as an increase-side control value P1 for the regeneration fan 1. Hereinafter, the increase-side control value P1 is referred to as an increase-side output value.

  In the decrease-side feedback control function BL2, the feedback control calculation unit (decrease side) 12 receives the dew point temperature tdpv and the target dew point temperature tdsp from the feedback control input unit 10, performs PID control calculation, and performs the regeneration fan 1 An adjustment value of the rotation speed (reproduction fan INV output) is obtained. That is, a regeneration fan INV output that makes the dew point temperature tdpv coincide with the target dew point temperature tdsp is obtained, and this regeneration fan INV output is set as a control value P2 on the decrease side with respect to the regeneration fan 1. Hereinafter, the decrease-side control value P1 is referred to as a decrease-side output value.

  In the present embodiment, the increase side feedback control function BL1 and the decrease side feedback control function BL2 obtain the control value for the regeneration fan 1 in the same way, but the increase side output is determined by the difference in parameters when performing the PID control calculation. The change rate of the output of the value P1 and the change rate of the output of the decrease side output value P2 are changed, and the change rate of the output of the increase side output value P1 is faster than the change rate of the output of the decrease side output value P2. Has been.

  That is, in the present embodiment, the output change rate of the increase side output value P1 obtained by the feedback control calculation unit (increase side) 11 is relatively fast, and the decrease obtained by the feedback control calculation unit (decrease side) 12 is relatively high. The change rate of the output of the side output value P2 is assumed to be slow. The feedback control calculation unit (increase side) 11 and the feedback control calculation unit (decrease side) 12 correspond to the control value determining means in the present invention.

  The control output function BL3 includes a control value change direction determination unit 13, a control output value calculation unit 14, and a control output value output unit 15.

  In the control output function BL3, as shown in FIG. 3, the control value change direction determination unit 13 changes the increase side output deviation calculation unit 13-1, the decrease side output deviation calculation unit 13-2, and the increase side feedback control. A direction determining unit (increasing side changing direction determining unit) 13-3, a decreasing side feedback control changing direction determining unit (decreasing side changing direction determining unit) 13-4, and a control value changing direction determining unit 13-5 are provided. Yes.

The increase side output deviation calculating unit 13-1 receives the increase side output value P1 from the increase side feedback control function BL1 as an input, and the deviation between the current increase side output value P1 _n and the previous increase side output value P1 _n-1. This deviation is output as an increase output deviation ΔP1. Note that the increase side output deviation ΔP1 may be obtained by a smoothing method such as a moving average.
ΔP1 = P1 _n −P1 _n−1 (1)

The decrease side output deviation calculation unit 13-2 receives the decrease side output value P2 from the decrease side feedback control function BL2 as an input, and the deviation between the current decrease side output value P2 _n and the previous decrease side output value P2 _n-1. This deviation is output as a decrease side output deviation ΔP2. Note that the decrease-side output deviation ΔP2 may be obtained by a smoothing method such as a moving average.
ΔP2 = P2 _n −P2 _n−1 (2)

  The increase side change direction determination unit 13-3 receives the increase side output deviation ΔP1 from the increase side output deviation calculation unit 13-1, and changes the increase side output value P1 based on the input increase side output deviation ΔP1. Determine the direction (increasing change direction). In this embodiment, when ΔP1> α, the increase side change direction is set as the increase direction. When α ≧ ΔP1 ≧ β, neutral (no output change) is set. When β> ΔP1, the increasing change direction is set as the decreasing direction. Α and β are arbitrarily set values, and are usually set to satisfy 0 ≧ α, 0 ≧ β, and α ≧ β.

  The decrease side change direction determination unit 13-4 receives the decrease side output deviation ΔP2 from the decrease side output deviation calculation unit 13-2, and changes the decrease side output value P2 based on the input decrease side output deviation ΔP2. The direction (decreasing side change direction) is determined. In this embodiment, when ΔP2> γ, the decreasing side change direction is the increasing direction. When γ ≧ ΔP2 ≧ δ, neutral (no output change) is set. When δ> ΔP2, the decreasing side change direction is the decreasing direction. Note that γ and δ are arbitrarily set values, and are normally set to satisfy 0 ≧ γ, 0 ≧ δ, and γ ≧ δ.

  The control value change direction determination unit 13-5 is based on the increase side change direction from the increase side change direction determination unit 13-3 and the decrease side change direction from the decrease side change direction determination unit 13-4. The change direction of the control value with respect to is determined. In this embodiment, the change direction of the control value is determined with reference to the table TB1. FIG. 4 shows a specific example of the table TB1.

  The control value change direction determination unit 13-5 refers to the table TB1, and if the increase side change direction is the increase direction, the control value change direction determination unit 13-5 regardless of the decrease side change direction (increase direction / decrease direction / neutral). The direction of change is the increasing direction. On the other hand, when both the increase side change direction and the decrease side change direction are the decrease direction, the change direction of the control value is set as the decrease direction. In other cases, it is neutral and output with an increasing change direction / decreasing change direction. This control value change direction determination unit 13 corresponds to the control value change direction determination means in the present invention.

  In the control output function BL3, the control output value calculation unit 14 receives the increase side output value P1 and the decrease side output value P2 from the control value change direction determination unit 13 and the change direction of the control value as inputs, and outputs a control output to the regeneration fan 1. Calculate the value (control output). The method of calculating the control output value in the control output value calculation unit 14 may be a table reference, or may be calculated using four arithmetic operations or size selection. In this embodiment, the control output value is obtained with reference to the table TB2. FIG. 5 shows a specific example of the table TB2.

  The control output value calculation unit 14 refers to the table TB2, and when the change direction of the control value is the increase direction, the control output value is the increase side output value P1, and the change direction of the control value is the decrease direction. In this case, the control output value is set to the decrease side output value P2. In other cases, the previous output value is set as the control output value. In other cases, when the increasing change direction indicates a decreasing direction, the decreasing change direction indicates an increasing direction, or when the increasing change direction indicates neutral and the decreasing change direction indicates an increasing direction. The reduced output value may be used as the control output value. The control output value calculation unit 14 corresponds to control output value calculation means in the present invention. In this example, the increase side output value P1 and the decrease side output value P2 are selected by referring to the table TB2. However, the selection of the increase side output value P1 and the decrease side output value P2 is also performed in this example. This is included in the concept of control output value calculation in the invention.

  In the control output function BL3, the control output value output unit 15 outputs the control output value (control output) calculated by the control output value calculation unit 14 to the reproduction fan 1 that is a control target. The control output value output unit 15 corresponds to the control output value output means in the present invention.

  Thus, in the present embodiment, when the control value change direction determination unit 13 determines that the change direction of the control value is the increase direction, that is, when the increase side change direction is the increase direction, The increase output value P1 having a fast change speed is output as the control output value. When the control value change direction determination unit 13 determines that the change direction of the control value is the decrease direction, that is, the increase side change direction. When both the decrease side change directions are the decrease direction, the decrease output value P2 whose output change speed is slow is output as the control output value.

  That is, in the present embodiment, when the change direction of the control value is an increase direction, feedback control (increase feedback control) with a fast output change speed is performed, and the change direction of the control value is a decrease direction. In such a case, feedback control (decrease-side feedback control) with a slow output change rate is performed. By implementing such 2-feedback control (increasing feedback / decreasing feedback control), the situation where the dew point temperature is difficult to follow the target dew point temperature is alleviated, and control is performed so that the dew point temperature follows the target dew point temperature as much as possible. Will be able to.

  FIG. 6 shows a flowchart of the capacity control executed by the controller 300 described above. When the control execution timing comes (YES in step S101), the controller 300 calculates the output value (increase output value P1) of the increase feedback feedback control by the increase feedback control function BL1 (step S102), and decreases the feedback control. The output value (decrease side output value P2) of the decrease side feedback back control is calculated by the function BL2 (step S103). Then, the control output function BL3 determines the change direction of the control value from the increase side output value P1 and the decrease side output value P2 (step S104), and calculates the control output value based on the determined change direction of the control value. (Step S105), the calculated control output value is output to the control target (reproduction fan 1) (Step S106).

[Embodiment 2]
In the first embodiment, when it is determined that the change direction of the control value is a decreasing direction, a control output value smaller than the previous control output value is output to the control target. However, since a strict dew point temperature control is required in a lithium ion factory or the like where a desiccant air conditioning system is used, it is desired to maintain “target dew point temperature ≧ measured dew point temperature” as much as possible. Therefore, it is desirable that the condition for determining the decreasing direction as the direction of change of the control value is stricter than the condition for determining the increasing direction or neutral.

  Therefore, in the second embodiment, when the state in which the change direction of the control value indicates the decreasing direction is maintained under a certain condition, the changing direction of the control value is determined as the decreasing direction. For example, when it is determined that the current value is continuously decreasing for a certain number of times or when it is determined that the current value is continuously decreasing for a certain time, the change direction of the control value is determined to be the decreasing direction.

  FIG. 7 shows a table TB1 'used in the second embodiment, and FIG. 8 shows a table TB2' used in the second embodiment. In the second embodiment, the table TB1 'as shown in FIG. 7 is used instead of the table TB1, and the table TB2' as shown in FIG. 8 is used instead of the table TB1. That is, in the functional block diagram of capacity control shown in FIG. 2, a table TB1 'is used instead of the table TB1, and a table TB2' is used instead of the table TB2.

  In the second embodiment, the control value change direction determination unit 13 refers to the table TB1 ′, and when both the increase side change direction and the decrease side change direction are the decrease direction, this state continues for a certain number of times. Or when the constant condition is maintained, such as continuing for a certain period of time, the change direction of the control value is set to the decreasing direction. In other cases, that is, until the condition where both the increasing side changing direction and the decreasing side changing direction are in the decreasing direction is maintained at a constant condition, it is neutral, and the output is output with the increasing side changing direction / decreasing side changing direction (decreasing / decreasing) To do. Others are the same as those in the first embodiment using the table TB1, and the description thereof is omitted.

  The control output value calculation unit 14 refers to the table TB2 ′ so that when the change direction of the control value from the control value change direction determination unit 13 is the decrease direction, the control output value is set to the decrease side output value P2. . When the change direction of the control value from the control value change direction determination unit 13 is decreasing / decreasing, the previous output value is set as the control output value. Others are the same as those in the first embodiment using the table TB2, and the description thereof is omitted.

  In this way, in the second embodiment, the condition determined to be decreasing can be made stricter than the condition determined to be increasing or neutral, and strict dew point temperature management is required. It is possible to maintain “target dew point temperature ≧ measured dew point temperature” as much as possible.

[Embodiment 3]
In the first embodiment, the control value change direction determination unit 13 uses the table TB1 to determine the change direction of the control value, and the determined change direction of the control value is determined as the increase side output value P1 and the decrease side output value P2. In addition, it is sent to the control output value calculation unit 14.

  On the other hand, in the third embodiment, as shown in FIG. 9, from the control value change direction determination unit 13, not the change direction of the control value but the increase side change direction and the decrease side change direction are set to the increase side output value. The P1 and the decrease side output value P2 are sent together to the control output value calculation unit 14. FIG. 10 shows the configuration of the control value change direction determination unit 13 in the third embodiment.

  In the third embodiment, the control output value calculation unit 14 receives the increase side change direction, the decrease side change direction, the increase side output value P1, and the decrease side output value P2 from the control value change direction determination unit 13, and reproduces them. A control output value (control output) for the fan 1 is calculated.

  The method of calculating the control output value in the control output value calculation unit 14 may be a table reference, or may be calculated using four arithmetic operations or size selection. In the third embodiment, the control output value is obtained with reference to the table TB3. FIG. 11 shows a specific example of the table TB3.

  The control output value calculation unit 14 refers to the table TB3, and when the increase side change direction is the increase direction, the control output value calculation unit 14 assumes that the control value change direction is in the increase direction, and decreases the change direction (increase / decrease). Regardless of (direction / neutral), the control output value is set to the increase side output value P1. On the other hand, when both the increase side change direction and the decrease side change direction are the decrease direction, the control output value is set to the decrease side output value P2 on the assumption that the control value change direction is in the decrease direction. In other cases, the previous output value is set as the control output value, assuming that the vehicle is in the neutral state. If the increasing change direction is the decreasing direction and the decreasing change direction is the increasing direction, or if the increasing change direction is neutral and the decreasing change direction is the increasing direction, the decreasing output value is controlled. It may be an output value.

  In the third embodiment, the control output value calculation unit 14 side substantially determines the control value change direction from the increase side change direction and the decrease side change direction from the control value change direction determination unit 13. Therefore, it can be said that the control value change direction determining means in the present invention is realized by a combination of the function of the control value change direction determining unit 13 and the partial function of the control output value calculating unit 14.

[Embodiment 4]
Also in the third embodiment, as in the second embodiment, when the state in which the change direction of the control value indicates the decrease direction is maintained under a constant condition, the change direction of the control value may be determined as the decrease direction. .

  FIG. 12 shows a table TB3 'used in the fourth embodiment. In the fourth embodiment, the table TB3 'as shown in FIG. 12 is used instead of the table TB3. That is, in the functional block diagram of capacity control shown in FIG. 9, a table TB3 'is used instead of the table TB3.

  In the fourth embodiment, the control output value calculation unit 14 refers to the table TB3 ′ so that when both the increase side change direction and the decrease side change direction are decreasing directions, this state continues for a certain number of times. When the constant condition is maintained, such as continuing for a certain period of time, the change direction of the control value is assumed to be in the decreasing direction, and the control output value is set to the decreasing side output value P2.

  In other cases, that is, until the condition in which the increase direction change direction and the decrease direction change direction are both decreasing is maintained at a constant condition, the control output value is set as the previous output value. Others are the same as those of the third embodiment using the table TB3, and the description thereof is omitted.

[Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

  For example, one feedback control function is used without dividing the increase-side feedback back control function BL1 and the decrease-side feedback back control function BL2, and the control value change direction is determined from the output of the feedback control function. The control output value may be calculated from the change direction. In this case, if the change direction of the control value is an increase direction, a control output value having a high output change speed is obtained. If the change direction of the control value is a decrease direction, a control output value having a slow output change speed is obtained. To ask.

  DESCRIPTION OF SYMBOLS 1 ... Reproduction | regeneration side fan (regeneration fan), 2 ... Processing side fan (air supply fan), 3 ... Desiccant rotor, 4 ... Cold water coil (pre-cooling coil), 5 ... Hot water coil (regeneration coil), S1 ... Dew point temperature sensor, S2 to S4 ... Temperature sensor, S5 ... Pressure sensor, INV1, INV2, INV3 ... Inverter, VL1 ... Cold water valve, VL2 ... Hot water valve, L1 ... Regeneration side flow path, L2 ... Processing side flow path, 100 ... Desiccant air conditioning 200 ... Dry area (air-conditioned space), 300 ... Controller, BL1 ... Increase side feedback control function, BL2 ... Decrease side feedback control function, BL3 ... Control output function, 10 ... Feedback control input unit, 11 ... Feedback control calculation Part (increase side), 12 ... feedback control calculation part (decrease side), 13 ... control value change direction determination part, 13-1 ... increase side Force deviation calculation unit, 13-2... Decrease side output deviation calculation unit, 13-3... Increase side feedback control change direction determination unit (increase side change direction determination unit), 13-4. (Decreasing side change direction determination unit), 13-5... Control value change direction determination unit, 14... Control output value calculation unit, 15... Control output value output unit, TB1, TB1 ′, TB2, TB2 ′, TB3, TB3 '…table.

Claims (8)

A regeneration-side fan that forms a regeneration-side air flow; a processing-side fan that forms a processing-side air flow; and a downstream side of the regeneration-side air flow path and an upstream side of the processing-side air flow path A desiccant rotor that is disposed so as to continuously absorb moisture from the processing-side air and release air to the regeneration-side air, and a precooling device that cools the processing-side air before moisture absorption by the desiccant rotor And a desiccant air-conditioning system that supplies the air on the regeneration side before moisture release by the desiccant rotor, and supplies the processing-side dry air absorbed by the desiccant rotor to the air-conditioned space.
A moisture amount detecting means for detecting a moisture amount at a predetermined position defined in a flow path through which the dry air on the processing side flows;
At least one of the flow rate of air on the regeneration side, the rotational speed of the desiccant rotor, and the heating capacity of the heating device is controlled, and the amount of moisture detected by the moisture amount detecting means becomes the target amount of moisture. Control value determining means for determining a control value for the control object;
Control value change direction determining means for determining the change direction of the control value determined by the control value determining means;
Control output value calculation means for calculating a control output value based on the change direction of the control value determined by the control value change direction determination means;
Control output value output means for outputting the control output value calculated by the control output value calculation means to the control object. A desiccant air conditioning system, comprising: In the desiccant air conditioning system according to claim 1,
The control output value calculation means includes
A desiccant air conditioning system characterized in that, when the change direction of the control value determined by the control value change direction determination means is an increase direction, a control output whose output change speed is faster than that in the decrease direction is calculated. In the desiccant air-conditioning system according to claim 1 or 2,
The control value change direction determining means includes
The desiccant air-conditioning system, wherein when the state in which the change direction of the control value indicates a decrease direction is maintained under a constant condition, the change direction of the control value is determined as the decrease direction. In the desiccant air conditioning system according to claim 1,
The control value determining means includes
Determine the control value with a fast output change speed as the increase side output value,
Decide a control value with a slow output change speed as the decrease side output value,
The control value change direction determining means includes
Determine the increasing direction of change from the increasing output value,
Determine the change direction on the decrease side from the decrease side output value,
The desiccant air-conditioning system, wherein a change direction of the control value is determined based on the determined change direction on the increase side and change direction on the decrease side. A regeneration-side fan that forms a regeneration-side air flow; a processing-side fan that forms a processing-side air flow; and a downstream side of the regeneration-side air flow path and an upstream side of the processing-side air flow path A desiccant rotor that is disposed so as to continuously absorb moisture from the processing-side air and release air to the regeneration-side air, and a precooling device that cools the processing-side air before moisture absorption by the desiccant rotor And a heating device that heats the air on the regeneration side before moisture release by the desiccant rotor, and is applied to a desiccant air conditioning system that supplies dry air on the processing side absorbed by the desiccant rotor to the air-conditioned space In the operation method of the desiccant air conditioning system,
A moisture amount detecting step for detecting a moisture amount at a predetermined position defined in a flow path through which the dry air on the processing side flows;
At least one of the flow rate of air on the regeneration side, the rotational speed of the desiccant rotor, and the heating capacity of the heating device is controlled, and the amount of moisture detected by the moisture amount detection step becomes a target moisture amount. A control value determining step for determining a control value for the control object;
A control value change direction determining step for determining a change direction of the control value determined by the control value determining step;
A control output value calculation step for calculating a control output value based on the change direction of the control value determined by the control value change direction determination step;
A control output value output step of outputting the control output value calculated in the control output value calculation step to the control object. A method for operating a desiccant air conditioning system, comprising: In the operating method of the desiccant air conditioning system according to claim 5,
The control output value calculation step includes:
Desiccant air conditioning characterized in that when the change direction of the control value determined by the control value change direction determination step is an increase direction, a control output value having a faster output change rate is calculated than when the control value change direction is a decrease direction. How to operate the system. In the operation method of the desiccant air conditioning system according to claim 5 or 6,
The control value change direction determining step includes:
A method of operating a desiccant air conditioning system, wherein the control value change direction is determined to be a decrease direction when a state in which the change direction of the control value indicates a decrease direction is maintained under a constant condition. In the operating method of the desiccant air conditioning system according to claim 5,
The control value determining step includes:
Determine the control value with a fast output change speed as the increase side output value,
Decide a control value with a slow output change speed as the decrease side output value,
The control value change direction determining step includes:
Determine the increasing direction of change from the increasing output value,
Determine the change direction on the decrease side from the decrease side output value,
A method of operating a desiccant air conditioning system, wherein the change direction of the control value is determined based on the determined change direction on the increase side and change direction on the decrease side.

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