JP2013094750A - Desiccant air-conditioning system and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a dew-point temperature follow a target dew point temperature in a short time when a dehumidification load changes.SOLUTION: The flow rate of air on a regeneration side is regarded as an object of control, and a control value (regeneration fan INV output) for the object of control is determined such that a dew point temperature tdpv is coincident with a target dew point temperature tdsp. A feedforward quantity is computed from the determined current regeneration fan INV output and last regeneration fan INV output. The computed feedforward quantity is used as a compensation quantity, and the delay of control over the related object of control with a regeneration coil valve opening output, a rotor INV output, an air supply fan INV output, and a pre-cooling coil valve opening output as control values is improved.

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 operated under conditions (operating conditions that can achieve the highest performance). For this reason, in winter and an intermediate period, performance may be too good and it may become excessively dehumidified. Therefore, in order to prevent such excessive dehumidification, a method of rehumidifying the air dehumidified by the desiccant rotor in the vicinity of the outlet is adopted, but there is a problem that an extra device for humidifying is required. Arise.

  To deal with such a problem, for example, in Patent Document 1, a dew point temperature sensor that detects the dew point temperature of the air dehumidified by the desiccant rotor is provided, and the dew point temperature detected by this dew point temperature sensor becomes the target dew point temperature. In addition, at least one of the flow rate of the air on the regeneration side, the rotational speed of the desiccant rotor, and the heating capability of the heating device for heating the air on the regeneration side is controlled. By carrying out such dew point temperature control, excessive dehumidification can be prevented without using an extra device.

  FIG. 13 shows an outline of a conventional desiccant air conditioning system using a desiccant rotor. 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.

  In this desiccant air conditioning system, the controller 300 has functions of dew point temperature control, regeneration coil exit temperature control, rotor regeneration side exit temperature control, precooling coil exit temperature control, and constant pressure control.

[Dew point temperature control]
As the dew point temperature control, the controller 300 adjusts the rotation speed of the regeneration fan 1, the rotation speed of the desiccant rotor 3, and the heating capacity of the regeneration coil 5 so that the dew point temperature tdpv detected by the temperature sensor S1 matches the target dew point temperature tdsp. Control at least one. In this example, as the dew point temperature control, the rotation speed of the regeneration fan 1, that is, the flow rate of the regeneration air is controlled.

[Regenerative coil outlet temperature control]
As the regeneration coil exit temperature control, the controller 300 controls the opening degree of the hot water valve VL2 so that the regeneration coil exit temperature tr1pv detected by the temperature sensor S3 matches the set temperature (regeneration coil exit temperature set value) tr1sp. That is, as the regeneration coil outlet temperature control, the heating capacity of the regeneration coil (heating device) 5 is controlled.

[Rotor regeneration side outlet temperature control]
As the rotor regeneration side outlet temperature control, the controller 300 adjusts the rotational speed of the desiccant rotor 3 so that the rotor regeneration side outlet temperature tr2pv detected by the temperature sensor S4 matches the set temperature (rotor regeneration side outlet temperature set value) tr2sp. Control.

[Precooling coil outlet temperature control]
The controller 300 controls the opening degree of the chilled water valve VL1 so that the precooling coil outlet temperature tspv detected by the temperature sensor S2 matches the set temperature (precooling coil outlet temperature set value) tssp. That is, as the precooling coil outlet temperature control, the cooling capacity of the precooling coil (precooling device) 4 is controlled.

(Constant pressure control)
The controller 300 controls the rotational speed of the air supply fan 2 so that the air supply duct pressure Pspv measured by the pressure sensor S5 matches the set value (supply air duct pressure set value) Pssp. That is, the flow rate of air on the processing side is controlled as constant pressure control.

[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 rotation speed of the regeneration fan 1 is controlled so that the dew point temperature tdpv matches the target dew point temperature tdsp, and the regeneration coil outlet temperature tr1pv becomes the regeneration coil outlet temperature set value tr1sp. The opening degree of the hot water valve VL2 is controlled so as to match, the rotation speed of the desiccant rotor 3 is controlled so that the rotor regeneration side outlet temperature tr2pv matches the rotor regeneration side outlet temperature set value tr2sp, and the precooling coil outlet temperature tspv is The opening degree of the chilled water valve VL1 is controlled so as to coincide with the precooling coil outlet temperature set value tssp, and the rotation speed of the air supply fan 2 is controlled so that the supply air duct pressure Pspv matches the supply air duct pressure set value Pssp. The

  In this way, in the desiccant air conditioning system shown in FIG. 13, the target dew point temperature tdsp, the regeneration coil outlet temperature set value tr1sp, the rotor regeneration side outlet temperature set value tr2sp, the precooling coil outlet temperature set value tssp, the supply duct pressure With the set value Pssp being constant, moisture absorption from the processing side air and moisture release to the regeneration side air are continuously performed in the desiccant rotor 3, and the air supply to the dry area 200 from the desiccant air conditioner 100 (low The supply of SA (humidity air) is continued.

Japanese Patent No. 3266326

  However, in the desiccant air conditioning system shown in FIG. 13, in a state where the dehumidifying load is low and the control is stable, that is, in a state where the flow rate of air on the regeneration side is small (the state where the speed of the regeneration fan 1 is low), When the dehumidification load rises rapidly, the air flow rate on the regeneration side increases due to the dew point temperature control, but the other control that changes the measured value for the set value in relation to this dew point temperature control causes a delay. There was a problem that the increase in the dehumidifying capacity of the machine 100 was delayed and the dew point temperature exceeded the target dew point temperature for a long time. Hereinafter, this problem will be specifically described.

[Dew point temperature control]
FIG. 14 shows a rotation speed adjustment output (regeneration fan INV output) to the regeneration fan 1 from the controller 300 that is changed by dew point temperature control. FIG. 14 also shows changes in the dew point temperature tdpv with respect to the target dew point temperature tdsp, together with the regeneration fan INV output.

  When the dehumidifying load suddenly rises and the dew point temperature tdpv rises rapidly with respect to the target dew point temperature tdsp (point t1 shown in FIG. 14) while the rotation speed of the regeneration fan 1 is low, the regeneration fan INV output is output by feedback of dew point temperature control Rises. Thereby, the flow rate of air on the regeneration side starts to increase.

[Regenerative coil outlet temperature control]
When the flow rate of the regeneration-side air starts to increase, the regeneration coil outlet temperature tr1pv decreases with respect to the regeneration coil outlet temperature set value tr1sp (point t2 shown in FIG. 15). The adjustment output (regeneration coil valve opening output) of the hot water to the regeneration coil 5 from the increase increases, and the heating capacity of the regeneration coil 5 increases. In this case, since the regeneration fan INV output starts to increase (point t1 shown in FIG. 15) and before the regeneration coil valve opening output starts to increase (point t2 shown in FIG. 15), there is a time lag τ1. The time T1 until the heating capacity of the coil 5 increases becomes longer.

[Rotor regeneration side outlet temperature control]
When the regeneration-side air flow rate starts to increase, the rotor regeneration-side outlet temperature tr2pv rises with respect to the rotor regeneration-side outlet temperature set value tr2sp (point t2 shown in FIG. 16). Then, the rotation speed adjustment output (rotor INV output) from the controller 300 to the desiccant rotor 3 increases. Thereby, the dehumidification capability of the desiccant rotor 3 is optimized. In this case, since there is a time lag τ2 from when the reproduction fan INV output starts to rise (point t1 shown in FIG. 16) until the rotor INV output starts to rise (point t2 shown in FIG. 16), the desiccant rotor 3 The time T2 until the dehumidifying capacity is optimized becomes longer.

(Constant pressure control)
When the air flow rate on the regeneration side starts to increase, the supply air duct pressure Pspv decreases with respect to the supply air duct pressure setting value Pssp (point t2 shown in FIG. 17). The rotational speed adjustment output for the air supply fan 2 (the air supply fan INV output) increases. As a result, the air flow rate on the processing side increases. In this case, since there is a time lag τ3 from when the regeneration fan INV output starts to rise (point t1 shown in FIG. 17) until the supply fan INV output starts to rise (point t2 shown in FIG. 17), the processing side The time T3 until the air flow rate (outside air intake amount) increases increases.

[Precooling coil outlet temperature control]
When the flow rate of the processing-side air starts to increase due to the increase of the regeneration-side air flow rate, the pre-cooling coil outlet temperature tspv rises with respect to the pre-cooling coil outlet temperature set value tssp (point t2 shown in FIG. 18). With the coil outlet temperature control, the adjustment output (precooling coil valve opening output) of the chilled water CW from the controller 300 to the precooling coil 4 is increased, and the cooling capacity of the precooling coil 4 is increased. In this case, since the regeneration fan INV output starts to increase (point t1 shown in FIG. 18) and before the precooling coil valve opening output starts to increase (point t2 shown in FIG. 18), there is a time lag τ4. The time T4 until the cooling capacity of the coil 4 increases becomes longer.

  Thus, when the flow rate of the regeneration side air is increased by the dew point temperature control, the measured value for the set value changes in relation to the dew point temperature control, the regeneration coil exit temperature control, the rotor regeneration side exit temperature control, Delays occur in other controls such as constant pressure control and precooling coil outlet temperature control, and as shown in FIG. 14, the time T until the increased dew point temperature tdpv follows the target dew point temperature tdsp becomes longer, and the desiccant air conditioning is performed. The increase in the dehumidifying capacity of the machine 100 is delayed.

  Unlike general air conditioning for offices, the facilities where desiccant air conditioners are used are lithium ion battery factories, and strict dew point temperature management is essential. This is because in a situation where the dew point temperature in the room is high, lithium and moisture may cause a chemical reaction and ignite. For this reason, it can be said that it is an important problem that the dew point temperature exceeds the target dew point temperature for a long time due to a delay in the increase in the dehumidifying capacity of the desiccant air conditioner.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a desiccant air conditioner that can cause the dew point temperature to follow the target dew point temperature in a short time when the dehumidifying load changes. It is to provide a system and a method for operating the system.

  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; The feedforward amount calculating means for calculating the feedforward amount from the current control value and the previous control value determined by the control value determining means, and the measured value for the set value changes in relation to the control of the control target Feed control means for improving the control delay of the related control object is provided with another control object as the related control object and the feed forward amount calculated by the feed forward amount calculating means as the compensation amount.

  In the present invention, the moisture amount at a predetermined position determined in the flow path through which the dry air on the processing side flows is detected, and the control value for the control target is set so that the detected moisture amount becomes the target moisture amount. Is determined. Then, the feedforward amount is calculated from the determined current control value and the previous control value, and the calculated feedforward amount is used as a compensation amount, and the measured value for the set value is related to the control of the control target. The delay in the control of the related control object that changes is improved.

  In the present invention, at least one of the flow rate of air on the regeneration side, the rotational speed of the desiccant rotor, and the heating capability of the heating device is set as a control target. For example, when the flow rate of air on the regeneration side is a control target, the amount of moisture at a predetermined position defined in the flow path through which dry air on the processing side flows is detected, and the detected amount of moisture is the target. A control value for the flow rate of the air on the regeneration side is determined so that the moisture amount is obtained. Then, a feedforward amount is calculated from the determined current control value and the previous control value, and the calculated feedforward amount is set as a compensation amount in relation to the control of the air flow rate on the regeneration side. The control delay of the related control object in which the measured value with respect to the value changes is improved.

  In the present invention, when the flow rate of air on the regeneration side is the control target, the relevant control targets are the flow rate of air on the processing side, the rotational speed of the desiccant rotor, the heating capability of the heating device, the cooling capability of the precooling device, and the like. For example, if the related control target is the processing-side air flow rate, the desiccant rotor speed, the heating device heating capacity, and the pre-cooling device cooling capacity, the processing-side air flow rate, desiccant rotor speed, heating device A feedforward amount is calculated for each of the heating capacity and the cooling capacity of the precooling device, and the airflow on the processing side, the rotational speed of the desiccant rotor, the heating capacity of the heating device, and the precooling device are calculated using the calculated feedforward amount as a compensation amount. The delay in cooling capacity control is improved.

  According to the present invention, 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 is a control target, and the control target is such that the detected water amount becomes a target water amount. Control value is determined, and the feedforward amount is calculated from the determined current control value and the previous control value, and the calculated feedforward amount is used as a compensation amount in relation to the control of the control target. Since the delay in the control of the related control target that changes the measured value relative to the value is improved, if the dehumidification load changes, the control of the related control target is accelerated, and the dew point temperature is quickly changed to the target dew point temperature. It can be made to follow.

It is a figure which shows the outline of one Embodiment (Embodiment 1) of the desiccant air-conditioning system which concerns on this invention. It is a figure which shows the structure of the principal part of the control object control value determination function part in the controller of the desiccant air-conditioning system of Embodiment 1, a feedforward amount calculation function part, a feedforward compensation function part, and a related control object control value determination function part. . It is a figure which shows the reproduction | regeneration fan INV output which changes with dew point temperature control in the desiccant air conditioning system of Embodiment 1 with the change of dew point temperature tdpv. It is a figure which shows the reproduction | regeneration coil valve opening output which changes with the reproduction | regeneration coil exit temperature control in the desiccant air conditioning system of Embodiment 1 with the change of the reproduction | regeneration fan INV output and the reproduction | regeneration coil exit temperature tr1pv. It is a figure which shows the rotor INV output which changes with the rotor reproduction | regeneration side exit temperature control in the desiccant air conditioning system of Embodiment 1 with the change of the reproduction | regeneration fan INV output and the rotor reproduction | regeneration side exit temperature tr2pv. It is a figure which shows the supply fan INV output which changes by the pressure constant control in the desiccant air-conditioning system of Embodiment 1 with the change of the regeneration fan INV output and the supply air duct pressure Pspv. It is a figure which shows the precooling coil valve opening output which changes with the precooling coil exit temperature control in the desiccant air-conditioning system of Embodiment 1 with the change of the regeneration fan INV output, the supply air fan INV output, and the precooling coil exit temperature tspv. It is a figure which shows the outline of other embodiment (Embodiment 2) of the desiccant air conditioning system which concerns on this invention. It is a figure which shows the structure of the principal part of the control object control value determination function part in the controller of the desiccant air-conditioning system of Embodiment 2, a feedforward amount calculation function part, a feedforward compensation function part, and a related control object control value determination function part. . It is a figure which shows the outline of another embodiment (Embodiment 3) of the desiccant air-conditioning system which concerns on this invention. It is a figure which shows the structure of the principal part of the control object control value determination function part in the controller of the desiccant air conditioning system of Embodiment 3, a feedforward amount calculation function part, a feedforward compensation function part, and a related control object control value determination function part. . 6 is a diagram showing a modification of the first embodiment. FIG. It is a figure which shows the outline of the conventional desiccant air conditioning system using a desiccant rotor. It is a figure which shows the reproduction | regeneration fan INV output which changes with dew point temperature control in the conventional desiccant air conditioning system with the change of dew point temperature tdpv. It is a figure which shows the reproduction | regeneration coil valve opening output which changes with the reproduction | regeneration coil exit temperature control in the conventional desiccant air conditioning system with the change of the reproduction | regeneration fan INV output and the reproduction | regeneration coil exit temperature tr1pv. It is a figure which shows the rotor INV output which changes with the rotor reproduction | regeneration side exit temperature control in the conventional desiccant air conditioning system with the change of the reproduction | regeneration fan INV output and the rotor reproduction | regeneration side exit temperature tr2pv. It is a figure which shows the supply fan INV output which changes by the pressure constant control in the conventional desiccant air conditioning system with the change of the regeneration fan INV output and the supply air duct pressure Pspv. It is a figure which shows the precooling coil valve | bulb opening degree output changed by the precooling coil exit temperature control in the conventional desiccant air conditioning system with the change of the regeneration fan INV output, the supply air fan INV output, and the precooling coil exit temperature tspv.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Embodiment 1: Circulating type desiccant air conditioner]
FIG. 1 is a diagram showing an outline of an embodiment (Embodiment 1) of a desiccant air conditioning system according to the present invention. In the figure, the same reference numerals as those in FIG. 13 denote the same or equivalent components as those described with reference to FIG. 13, and the description thereof will be omitted.

  In this embodiment, the controller is denoted by reference numeral 300A in order to distinguish it from the controller in the conventional desiccant air conditioning system shown in FIG. The controller 300A is realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with the hardware.

  In the first embodiment, the controller 300A uses the regeneration-side air flow rate as a control target, and a control target control value determination function unit that determines a control value for the control target so that the dew point temperature tdpv becomes the target dew point temperature tdsp. 301, a feedforward amount calculation function unit 302 that calculates a feedforward amount from the current control value determined by the control target control value determination function unit 301 and the previous control value, and the control target control value Feed-forward compensation for improving the control delay of the related control target, with another control target whose measured value for the set value is changed as a related control target, and with the feed-forward amount calculated by the feed-forward amount calculation function unit 302 as a compensation amount Function unit 303 and related control target control value determination function unit 30 for determining a control value for the related control target 4 is provided.

  FIG. 2 shows a configuration of main parts of the control target control value determination function unit 301, the feedforward amount calculation function unit 302, the feedforward compensation function unit 303, and the related control target control value determination function unit 304 in the controller 300A.

  The control target control value determination function unit 301 includes a feedback control unit (FB control unit) FB0. The feedback control unit FB0 receives a dew point temperature tdpv detected by the temperature sensor S1 and a predetermined target dew point temperature tdsp, and inputs a control value (control for the control target) to make the dew point temperature tdpv coincide with the target dew point temperature tdsp. Value). In this case, a reproduction fan INV output for the reproduction fan 1 is generated as a control value for the control target.

  The related control target control value determination function unit 304 includes feedback control units (FB control units) FB1 to FB4. The feedback control unit FB1 receives the precooling coil outlet temperature tspv detected by the temperature sensor S2 and a predetermined precooling coil outlet temperature set value tssp, and matches the precooling coil outlet temperature tspv with the precooling coil outlet temperature set value tssp. A control value (control value for the related control target) is generated. In this case, a precooling coil valve opening output for the precooling coil 4 is generated as a control value for the related control target.

  The feedback control unit FB2 receives the reproduction coil outlet temperature tr1pv detected by the temperature sensor S3 and a predetermined reproduction coil outlet temperature setting value tr1sp, and matches the reproduction coil outlet temperature tr1pv with the reproduction coil outlet temperature setting value tr1sp. A control value (control value for the related control target) is generated. In this case, a regeneration coil valve opening output for the regeneration coil 5 is generated as a control value for the related control target.

  The feedback control unit FB3 receives the rotor regeneration side outlet temperature tr2pv detected by the temperature sensor S4 and a predetermined rotor regeneration side outlet temperature set value tr2sp, and uses the rotor regeneration side outlet temperature tr2pv as the rotor regeneration side outlet temperature setting. A control value (control value for the related control target) that matches the value tr2sp is generated. In this case, a rotor INV output for the desiccant rotor 3 is generated as a control value for the related control target.

  The feedback control unit FB4 receives the supply air duct pressure Pspv measured by the pressure sensor S5 and a predetermined supply air duct pressure set value Pssp, and matches the supply air duct pressure Pspv with the supply air duct pressure set value Pssp. A control value (control value for the related control target) is generated. In this case, an air supply fan INV output for the air supply fan 2 is generated as a control value for the related control target.

  The feedforward amount calculation function unit 302 includes a feedforward amount calculation unit (FF calculation unit) FFC. The feedforward amount calculation unit FFC calculates the feedforward amount from the current reproduction fan INV output from the control target control value determination function unit 301 and the previous reproduction fan INV output.

  For example, as an example a, when the feedforward amount calculated by the feedforward amount calculation unit FFC is FF_a, the feedforward amount FF_a is obtained as FF_a = current reproduction fan INV output / previous reproduction fan INV output. Further, as an example b, when the feedforward amount calculated by the feedforward amount calculation unit FFC is FF_b, FF_b = (current reproduction fan INV output−previous reproduction fan INV output) ÷ previous reproduction fan INV output × 100 As a percentage, the feedforward amount FF_b is obtained.

  The feedforward compensation function unit 303 includes feedforward compensation units (FF compensation units) FF1 to FF4. The feedforward compensation unit FF1 uses the feedforward amount from the feedforward amount calculation function unit 302 as a compensation amount, and outputs the precooling coil valve opening degree to the precooling coil 4 from the feedback control unit FB1 in the related control target control value determination function unit 304. Compensate for (%). For example, in the case of Example a, precooling coil valve opening output (after FF compensation) = precooling coil valve opening output (before FF compensation) × FF_a, and in Example b, precooling coil valve opening output (FF compensation). After) = Precooling coil valve opening output (before FF compensation) + FF_b.

  The feedforward compensation unit FF2 uses the feedforward amount from the feedforward amount calculation function unit 302 as a compensation amount, and outputs the regeneration coil valve opening degree to the regeneration coil 5 from the feedback control unit FB2 in the related control target control value determination function unit 304. Compensate for (%). For example, in the case of example a, the regeneration coil valve opening output (after FF compensation) = the regeneration coil valve opening output (before FF compensation) × FF_a, and in the case of example b, the regeneration coil valve opening output (FF compensation). After) = Precooling coil valve opening output (before FF compensation) + FF_b.

  The feedforward compensation unit FF3 uses the feedforward amount from the feedforward amount calculation function unit 302 as a compensation amount, and the rotor INV output (%) to the desiccant rotor 3 from the feedback control unit FB3 in the related control target control value determination function unit 304 To compensate. For example, in the case of example a, rotor INV output (after FF compensation) = rotor INV output (before FF compensation) × FF_a, and in case of example b, rotor INV output (after FF compensation) = rotor INV output (FF compensation) Previous) + FF_b.

  The feedforward compensation unit FF4 uses the feedforward amount from the feedforward amount calculation function unit 302 as a compensation amount, and outputs the supply fan INV to the supply fan 2 from the feedback control unit FB4 in the related control target control value determination function unit 304 Compensate for (%). For example, in the case of Example a, the supply fan INV output (after FF compensation) = the supply fan INV output (before FF compensation) × FF_a, and in the case of Example b, the supply fan INV output (after FF compensation) = Air supply fan INV output (before FF compensation) + FF_b.

[Operation when dehumidification load rises rapidly]
In this desiccant air conditioning system, when the dehumidification load is low and the control is stable (when the rotation speed of the regeneration fan 1 is low) and the dehumidification load increases rapidly, the flow rate of the regeneration-side air is increased by dew point temperature control. .

  In this case, the controller 300A determines the regeneration fan INV output so that the dew point temperature tdpv matches the target dew point temperature tdsp, and feedforward is performed based on the determined current regeneration fan INV output and the previous regeneration fan INV output. The amount of calculation is calculated, and the calculated feedforward amount is used as a compensation amount, and the control value of the related control target is set with the regeneration coil valve opening output, the rotor INV output, the supply fan INV output, and the precooling coil valve opening output as control values. Improve delay. This speeds up the control of the related control objects (regeneration coil outlet temperature control, rotor regeneration side outlet temperature control, constant pressure control, precooling coil outlet temperature control), and the dew point temperature tdpv follows the target dew point temperature tdsp in a short time. It becomes like this. Hereinafter, this point will be specifically described.

[Dew point temperature control]
When the dehumidifying load suddenly rises and the dew point temperature tdpv rises rapidly with respect to the target dew point temperature tdsp (point t1 shown in FIG. 3) while the rotation speed of the regeneration fan 1 is low, the regeneration fan INV output is output by feedback of dew point temperature control. Rises. Thereby, the flow rate of air on the regeneration side starts to increase.

[Regenerative coil outlet temperature control]
When the reproduction fan INV output starts to rise, a feedforward amount is calculated from the current reproduction fan INV output and the previous reproduction fan INV output (FF calculation unit FFC), and the calculated feedforward amount is used for the reproduction coil 5. The regeneration coil valve opening output is compensated (FF compensation unit FF2).

  As a result, the time lag τ1 from when the regeneration fan INV output starts to increase (point t1 shown in FIG. 4) until the regeneration coil valve opening output starts to increase (point t2 shown in FIG. 4) becomes τ1≈0. For this reason, the increase start of the regeneration coil valve opening output is accelerated, the increase start of the regeneration coil outlet temperature tr1pv is accelerated, and the time T1 until the heating capacity of the regeneration coil 5 is increased is shortened.

[Rotor regeneration side outlet temperature control]
When the reproduction fan INV output starts to rise, a feedforward amount is calculated from the current reproduction fan INV output and the previous reproduction fan INV output (FF calculation unit FFC), and the calculated feedforward amount is used for the desiccant rotor 3. The rotor INV output is compensated (FF compensation unit FF3).

  As a result, the time lag τ2 from when the reproduction fan INV output starts to rise (point t1 shown in FIG. 5) until the rotor INV output starts to rise (point t2 shown in FIG. 5) becomes τ2≈0. For this reason, the rotor INV output starts to rise quickly, the rotor regeneration side outlet temperature tr2pv starts to fall quickly, and the time T2 until the dehumidifying capacity of the desiccant rotor 3 is optimized is shortened.

(Constant pressure control)
When the regeneration fan INV output starts to rise, the feedforward amount is calculated from the current regeneration fan INV output and the previous regeneration fan INV output (FF operation unit FFC), and the air supply fan 2 is calculated by the calculated feedforward amount. Is compensated for the supply fan INV output (FF compensation unit FF4).

  As a result, the time lag τ3 from when the regeneration fan INV output starts to rise (point t1 shown in FIG. 6) until the supply fan INV output starts to rise (point t2 shown in FIG. 6) becomes τ3≈0. For this reason, the start of the increase in the supply fan INV output is accelerated, the increase in the supply duct pressure Pspv is started earlier, and the time T3 until the flow rate of the processing side air (intake amount of outside air) increases is shortened. .

[Precooling coil outlet temperature control]
When the regeneration fan INV output starts to rise, the feedforward amount is calculated from the current regeneration fan INV output and the previous regeneration fan INV output (FF operation unit FFC), and the calculated feedforward amount is used for the precooling coil 4. The precooling coil valve opening output is compensated (FF compensation unit FF1).

  As a result, the time lag τ4 from when the regeneration fan INV output starts to increase (point t1 shown in FIG. 7) until the precooling coil valve opening output starts to increase (point t2 shown in FIG. 7) becomes τ4≈0. For this reason, the increase start of the precooling coil valve opening output is accelerated, the decrease start of the precooling coil outlet temperature tspv is accelerated, and the time T4 until the capacity of the precooling coil 4 is increased is shortened.

  Thus, in the present embodiment, when the flow rate of the regeneration-side air is increased by dew point temperature control, the increase in the flow rate of the regeneration-side air is used as the feedforward amount, and the control value of the related control target. Compensation of regeneration coil valve opening output, rotor INV output, supply fan INV output, and pre-cooling coil valve opening output, heating capacity of regeneration coil 5, dehumidification capacity of desiccant rotor 3, air flow rate on the processing side ( The intake capacity of the outside air) and the cooling capacity of the pre-cooling coil 4 are quickly adjusted, and as shown in FIG. 3, the time T until the increased dew point temperature tdpv follows the target dew point temperature tdsp is shortened.

  In the first embodiment, in the constant pressure control, the pressure of the supply air SA to the dry area 200 is measured as the supply air duct pressure Pspv, and this supply air duct pressure Pspv coincides with the supply air duct pressure set value Pssp. For example, the pressure in the desiccant air conditioner 100 (air conditioner internal pressure) is measured, and the measured pressure is controlled to be constant, or the pressure in the dry area 200 (room pressure) is measured. The measurement pressure may be controlled to be constant.

[Embodiment 2: One-way Desiccant Air Conditioner]
In the first embodiment, the case where the desiccant air conditioner is a circulation type desiccant air conditioner has been described as an example. However, in the second embodiment, the desiccant air conditioner is a one-way desiccant air conditioner. FIG. 8 shows a desiccant air conditioning system according to the second embodiment.

  In the desiccant air conditioning system according to the second embodiment, a desiccant air conditioner (one-way desiccant air conditioner) is denoted by reference numeral 101 and is distinguished from the desiccant air conditioner (circulating desiccant air conditioner) 100 according to the first embodiment. Further, in the desiccant air conditioning system of the second embodiment, the controller is denoted by reference numeral 300B, and is distinguished from the controller 300A in the first embodiment.

  Similar to controller 300A in the first embodiment, controller 300B includes control target control value determination function unit 301, feedforward amount calculation function unit 302, feedforward compensation function unit 303, and related control target control value determination function unit 304. However, as shown in FIG. 9, the feedforward compensation function unit 303 includes only the feedforward compensation unit FF2, and the related control target control value determination function unit 304 includes only the feedback control units FB1 and FB2.

  That is, the dew point temperature control and the precooling coil outlet temperature control are performed by feedback control, and the regeneration coil outlet temperature control is performed with feedforward compensation. Further, the rotor INV output is given as a fixed value (rated value) to the desiccant rotor 3, and the air supply fan INV output is given as a fixed value (rated value) to the air supply fan 2, and the rotor rotational speed It is assumed that constant control and constant control of outside air intake amount are performed.

  In the desiccant air conditioning system of the second embodiment, since the regeneration coil outlet temperature control is performed with feedforward compensation, the regeneration fan INV output starts to increase as shown in FIG. 4 (t1 shown in FIG. 4). Point), the time lag τ1 until the regeneration coil valve opening output starts to increase (point t2 shown in FIG. 4) becomes τ1≈0. For this reason, the increase start of the regeneration coil valve opening output is accelerated, the increase start of the regeneration coil outlet temperature tr1pv is accelerated, and the time T1 until the heating capacity of the regeneration coil 5 is increased is shortened.

  As a result, when the dehumidifying load rises rapidly with the rotation speed of the regeneration fan 1 being low, the heating capacity of the regeneration coil 5 is quickly adjusted, and the increased dew point temperature tdpv is the target as shown in FIG. The time T until the dew point temperature tdsp is followed is shortened.

[Embodiment 3]
Also in Embodiment 3, the desiccant air conditioner is a one-way type desiccant air conditioner. FIG. 10 shows a desiccant air conditioning system according to Embodiment 3 in the case where the desiccant air conditioner is a one-way desiccant air conditioner. In this example, the desiccant air conditioner is denoted by reference numeral 102 and is distinguished from the desiccant air conditioner 101 in the second embodiment. Further, the controller is denoted by reference numeral 300C, and is distinguished from the controller 300B in the second embodiment.

  Similar to the controller 300A in the first embodiment, the controller 300C includes a control target control value determination function unit 301, a feedforward amount calculation function unit 302, a feedforward compensation function unit 303, and a related control target control value determination function unit 304. However, as shown in FIG. 11, the feedforward compensation function unit 303 includes only the feedforward compensation units FF2 and FF3, and the related control target control value determination function unit 304 includes only the feedback control units FB1, FB2, and FB3. There are too.

  That is, dew point temperature control and precooling coil outlet temperature control are performed by feedback control, and regeneration coil outlet temperature control and rotor regeneration side outlet temperature control are performed with feedforward compensation. Further, the supply fan INV output is given to the supply fan 2 as a fixed value (rated value), and the outside air intake amount constant control is performed.

  In the desiccant air conditioning system of the third embodiment, since the regeneration coil outlet temperature control is performed with feedforward compensation, as shown in FIG. 4, the regeneration fan INV output starts to rise (t1 shown in FIG. 4). Point), the time lag τ1 until the regeneration coil valve opening output starts to increase (point t2 shown in FIG. 4) becomes τ1≈0. For this reason, the increase start of the regeneration coil valve opening output is accelerated, the increase start of the regeneration coil outlet temperature tr1pv is accelerated, and the time T1 until the capacity of the regeneration coil 5 is increased is shortened.

  Further, since the rotor regeneration side outlet temperature control is performed with feed forward compensation, the rotor INV output increases after the regeneration fan INV output starts increasing (point t1 shown in FIG. 5) as shown in FIG. The time lag τ2 until starting (point t2 shown in FIG. 5) becomes τ2≈0. For this reason, the rotor INV output starts to rise quickly, the rotor regeneration side outlet temperature tr2pv starts to fall quickly, and the time T2 until the dehumidifying capacity of the desiccant rotor 3 is optimized is shortened.

  As a result, when the dehumidifying load suddenly increases with the rotation speed of the regenerative fan 1 being low, the heating capacity of the regenerative coil 5 and the dehumidifying capacity of the desiccant rotor 3 are quickly adjusted. As shown in FIG. The time T until the raised dew point temperature tdpv follows the target dew point temperature tdsp is shortened.

  In each of the above-described embodiments, the rotation speed of the regeneration fan 1 is controlled so that the dew point temperature tdpv matches the target dew point temperature tdsp. However, the rotation speed of the desiccant rotor 3 and the heating capacity of the regeneration coil 5 are controlled. May be controlled. In this case, the number of rotations of the desiccant rotor 3 and the heating capacity of the regenerative coil 5 are controlled objects in the present invention, and other controlled objects whose measured values for the set values change in relation to the control of the controlled objects are related controls. It becomes a target.

  Further, in each of the above-described embodiments, the operation when the dehumidifying load suddenly increases has been described, but when the dehumidifying load suddenly decreases, the current regeneration fan INV output and the previous regeneration fan are also output in the same manner as described above. The feedforward amount is calculated from the INV output, and the control delay of the related control object is improved by using the calculated feedforward amount as the compensation amount, so that the dew point temperature tdpv follows the target dew point temperature tdsp in a short time. become.

  Further, in each of the above-described embodiments, the air supply fan 2 does not necessarily have to be provided in the front stage of the desiccant rotor 3 (processing side air inlet side), but the rear stage of the desiccant rotor 3 (processing side air outlet). It may be provided on the side). Similarly, the regeneration fan 1 does not necessarily have to be provided at the rear stage (regeneration-side air outlet side) of the desiccant rotor 3, but is provided at the front stage (regeneration-side air inlet side) of the desiccant rotor 3. Also good.

  Moreover, in each embodiment mentioned above, it was set as the type which isolate | separated the desiccant air conditioner and the controller, However, You may incorporate a controller in a desiccant air conditioner. The desiccant air conditioning system of the present invention may be configured as a system that combines a desiccant air conditioner, a controller, and a dry area, or may be configured as a combined system of a desiccant air conditioner and a controller. Moreover, you may be comprised as a desiccant air conditioner incorporating a controller.

  In each of the above-described embodiments, the heating device that heats the air on the regeneration side is a hot water coil, and the cooling device that cools the dry air on the processing side is a cold water coil. It is not limited to cold water coils. In addition, as shown in a modification of the first embodiment (FIG. 1) in FIG. 12, the return air RA from the dry area 200 may be mixed with the processing-side air.

  Further, in each of the embodiments described above, the dew point temperature of the supply air SA is detected. However, the detection point of the dew point temperature may not necessarily be the supply air SA, and may be the return air RA. Good. That is, the dew point temperature may be detected at any point as long as it is in a flow path through which dry air (dry air) on the processing side after moisture absorption flows. Further, it is not always necessary to detect the dew point temperature, and the humidity may be detected. When detecting humidity, relative humidity may be detected or absolute humidity may be detected.

  Further, in each of the above-described embodiments, the number of desiccant rotors is one, but a plurality of desiccant rotors may be arranged, and air may be continuously processed by the desiccant rotors arranged in a plurality of stages. For example, when the desiccant rotor has a two-stage configuration, the first cold water coil, the first desiccant rotor, the second cold water coil, and the second desiccant rotor on the processing side, and the first hot water coil on the regeneration side, Air is continuously passed in the order of the second desiccant rotor, the second hot water coil, and the first desiccant rotor.

  In each of the embodiments described above, a part of the processing-side air that has passed through the desiccant rotor may be used as the regeneration-side air, or a part of the processing-side air that has passed through the desiccant rotor may be used as outside air. Alternatively, a mixture with return air may be used. Also, as the regeneration side air, a part of the regeneration side air after passing the desiccant rotor may be used, or the regeneration side air after passing the desiccant rotor is mixed with outside air or return air. Also good.

  The adsorption / desorption device and the rotor rotation speed control method of the present invention can be used in various fields such as a lithium battery factory, a food factory, and a distribution warehouse as air conditioning for keeping humidity low.

  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 ... Treatment side flow path, 100, 101, DESCRIPTION OF SYMBOLS 102 ... Desiccant air conditioner, 200 ... Dry area (air-conditioning space), 300A, 300B, 300C ... Controller, 301 ... Control object control value determination function part, 302 ... Feedforward amount calculation function part, 303 ... Feedforward compensation function part , 304 ... related control target control value determination function unit, FB0 to FB4 ... feedback control unit (FB control unit), FFC ... feed flow Word calculation unit (FF calculation unit), FF1 to FF4 ... feedforward compensator (FF compensator).

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;
A feedforward amount calculating means for calculating a feedforward amount from the current control value determined by the control value determining means and the previous control value;
The other control target whose measurement value for the set value changes in relation to the control of the control target is the related control target, and the feedforward amount calculated by the feedforward amount calculating means is the compensation amount. A desiccant air-conditioning system comprising: a feedforward compensation means for improving control delay. In the desiccant air conditioning system according to claim 1,
The control object is a flow rate of air on the regeneration side,
The related control object is a heating capacity of the heating device. In the desiccant air conditioning system according to claim 1,
The control object is a flow rate of air on the regeneration side,
The related control object is a heating capacity of the heating device and a rotational speed of the desiccant rotor. In the desiccant air conditioning system according to claim 1,
The control object is a flow rate of air on the regeneration side,
The related control object is a flow rate of air on the processing side, a rotational speed of the desiccant rotor, a heating capacity of the heating device, and a cooling capacity of the precooling device. 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 feedforward amount calculating step of calculating a feedforward amount from the current control value determined by the control value determining step and the previous control value;
The other control object whose measured value for the set value changes in relation to the control of the control object is the related control object, and the feedforward amount calculated in the feedforward amount calculating step is the compensation amount, and the related control object And a feedforward compensation step for improving the control delay of the desiccant air conditioning system. In the operating method of the desiccant air conditioning system according to claim 5,
The control object is a flow rate of air on the regeneration side,
The related control target is a heating capacity of the heating device. A method of operating a desiccant air-conditioning system. In the operating method of the desiccant air conditioning system according to claim 5,
The control object is a flow rate of air on the regeneration side,
The related control object is a heating capacity of the heating device and a rotational speed of the desiccant rotor. An operating method of a desiccant air conditioning system, wherein: In the operating method of the desiccant air conditioning system according to claim 5,
The control object is a flow rate of air on the regeneration side,
The related control object is a flow rate of air on the processing side, a rotational speed of the desiccant rotor, a heating capacity of the heating device, and a cooling capacity of the precooling device. An operating method of a desiccant air conditioning system,

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