JP5493814B2 - Control method and apparatus for coating air conditioner - Google Patents

Description

  The present invention relates to a control method and a control device for a coating air conditioner used in, for example, a car body painting factory of an automobile, and belongs to the technical field of the coating air conditioner.

  In recent years, as paints for painting automobile bodies, etc., there is a tendency to use water-based paints in consideration of the environment, but in the case of water-based paints, the amount of moisture contained in the paints greatly affects the paint quality, The amount of moisture changes with evaporation, and the evaporation speed is affected by the temperature and humidity of the air in the painting booth. In other words, in order to maintain the required coating quality, it is necessary to control the evaporation rate of water in the coating to be constant, and for that purpose, the temperature and humidity of the air supplied to the booth must be controlled.

  In response to such a problem, for example, Patent Document 1 discloses a temperature of an air conditioning facility in which preheating, heat insulation humidification, cooling, and postheating are performed so that air supplied to a painting booth becomes a target temperature and humidity. A humidity control device is disclosed.

  In this type of conditioned air control device, as shown in FIG. 13, the temperature and absolute humidity are made to correspond to a line with a relative humidity of 100% (saturated air line) on an air diagram with the horizontal axis and the vertical axis. If a target temperature / humidity line is set in advance and the temperature / humidity of the outside air is at a point P1 on the diagram, for example, the target temperature on the same enthalpy line as the outside temperature / humidity point P1 is set. A point Q1 on the humidity line is set as a target point, and control is performed to match the temperature and humidity of the conditioned air with the target value by adiabatic humidification along the isoenthalpy line.

Japanese Patent No. 3993358

  By the way, in the air conditioning control as described above, for example, due to the temperature of the humidifying water, or due to individual differences of each humidifier when a plurality of humidifiers are provided, in the above example, the temperature and humidity are in the isoenthalpy line. May not change along.

  In this case, as shown by a broken line in FIG. 13, the temperature and humidity of the conditioned air coincide with the target value by humidifying to the absolute humidity of the target point Q1 and then increasing the temperature to the temperature of the target point Q1 by post-heating. In this case, extra energy for post-heating indicated by symbol a is consumed in comparison with the original control indicated by the solid line.

  Moreover, in order to remove the dust in the air supplied in the painting booth, a humidifier may be always operated and in this case, the following problems may arise.

  That is, in this case, as shown in FIG. 14, when the temperature / humidity point P2 of the outside air is near the lower side of the target temperature / humidity line (high temperature / low absolute humidity side), it is the minimum for removing dust. The target temperature / humidity line may be exceeded by the operation of the humidifier, so the point where the target temperature / humidity line crosses the target temperature / humidity line when the temperature is increased by post-heating after the humidifier is in the minimum operating state. Q2 will be set.

  However, in this case as well, if the change due to humidification deviates from the isoenthalpy line, as shown by the broken line, the post-heating must be performed more than expected as shown by the symbol b, and energy is used for the post-heating. It will consume extra.

  Also, as shown in FIG. 15, when the temperature / humidity point P3 of the outside air is on the upper side of the target temperature / humidity line (low temperature / high absolute humidity side), the minimum for removing dust is the same as in FIG. In this case, the humidity reaches the point (dew point) R3 on the saturated air line due to the minimum operation of the humidifier, and the humidity further increases. Since the temperature does not rise, the temperature is increased by post-heating from the dew point R3, and the point that intersects the target temperature and humidity line is set as the target temperature and humidity point Q3.

Furthermore, in recent years, in order to respond to energy saving requirements and CO ₂ emission control requirements, it is desired not to install a cooler or a dehumidifier in the air conditioner. Changes in temperature and humidity shift to a higher temperature side at the same absolute humidity than the isoenthalpy line because the temperature drop due to humidification becomes insufficient when the temperature is high, in other words, the side where the absolute humidity increases at the same temperature. It will shift to.

  In this case, for example, when the temperature / humidity point of the outside air is the point P1 in FIG. 13, the temperature / humidity of the conditioned air changes as indicated by the chain line, but dehumidification control cannot be performed, so that it matches the target point Q1. It becomes impossible.

  Further, in the case where the temperature and humidity point of the outside air is the point P2 in FIG. 14 and the point P3 in FIG. 15, the absolute humidity as shown by the chain line is indicated by the minimum operation of the humidifier for removing dust. However, unless the humidity exceeds the target points Q2 and Q3 and the dehumidification control is not performed, the temperature and humidity point of the conditioned air cannot be matched with the target points Q2 and Q3.

  In view of this, the first object of the present invention is to suppress the consumption of excess energy when controlling the temperature and humidity of the outside air to the target value, and also in the air conditioning apparatus that does not include a cooler or a dehumidifier. It is a second problem to make the temperature controllable to the target temperature and humidity.

  In order to solve the above-described problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application adjusts the temperature and humidity of the outside air with humidifying and heating devices, and the generated temperature and humidity of the conditioned air is more than the saturated air line on the air diagram. A control method of a coating air conditioner that supplies the paint booth by controlling the equipment so as to match a target temperature and humidity on a target temperature and humidity line set on a low humidity side, the actual temperature and humidity of the conditioned air and the target By driving the humidifying and / or heating device according to the temperature / humidity difference, the temperature / humidity of the conditioned air is feedback-controlled to match the target temperature / humidity, and the minimum driving amount of the humidifying device Is set, and when the target temperature and humidity are set to be achieved by the operation of the humidifying device with the minimum driving amount and the operation of the heating device, the driving state of the humidifying device is detected, When the drive amount is larger than the minimum drive amount, the minimum drive As will be, and correcting the target temperature and humidity in the target temperature and humidity line.

The invention according to claim 2 adjusts the temperature and humidity of the outside air with humidifying and heating devices, and the temperature and humidity of the generated conditioned air is lower than the saturated air line on the air diagram. A control method of a coating air conditioner that controls the equipment to match a target temperature / humidity set on a target temperature / humidity line and supplies the paint booth with the actual temperature / humidity of the conditioned air and the target temperature / humidity By driving the humidifying and / or heating device according to the difference between the temperature and humidity, the temperature and humidity of the conditioned air is feedback-controlled to match the target temperature and humidity, and the humidifying device and the heating device When the driving state is detected and the temperature and humidity of the conditioned air have converged to the target temperature and humidity, if the driving amounts of the humidifying device and the heating device are not the minimum driving amount, the humidifying device Or the drive amount of the heating device is the minimum drive amount. In addition, when the target temperature / humidity is corrected to the low temperature and low absolute humidity side on the target temperature / humidity line and the temperature / humidity of the conditioned air does not converge to the target temperature / humidity, the humidifying device or the heating device is driven. The target temperature / humidity is corrected to the high temperature / high absolute humidity side on the target temperature / humidity line so that the amount converges with the minimum drive amount.

On the other hand, according to the third aspect of the present invention, in the method for controlling a coating air conditioner according to the first or second aspect, the target temperature and humidity are set so as to be achieved only by controlling the humidifying device. When the heating device is detected, the target temperature and humidity are set on the target temperature and humidity line so that the driving amount becomes the minimum driving amount when the heating device is driven. It is characterized by correcting .

  With the above configuration, according to the method of claim 1, in the coating air conditioner that adjusts the temperature / humidity of the outside air to the target temperature / humidity by the humidifying device and the heating device and supplies the coating booth, The temperature / humidity of the conditioned air is not controlled to the target temperature / humidity or adjusted to the target temperature / humidity due to the temperature of the humidifying water, or due to individual differences between the devices when multiple humidifying devices are provided. When the operation of the device during the operation is wasted, the target temperature / humidity point is corrected on the predetermined target temperature / humidity line so that the drive amount of the device is minimized.

  Accordingly, the air-conditioning air supplied to the painting booth is adjusted to the optimum temperature and humidity while suppressing the energy consumption due to the wasteful operation of the equipment, whereby the moisture from the paint in the painting booth is adjusted. As a result, the evaporation rate is kept substantially constant, and good coating quality is ensured.

In this case, according to this method, for example, when the minimum driving amount of the humidifying device is set for the purpose of removing dust in the air, the driving amount of the humidifying device is set to the minimum driving amount. If it is larger, the target temperature and humidity are corrected so that the drive amount becomes the minimum drive amount, so that energy consumption due to useless operation of the humidifying device is suppressed.

Further, according to the method of claim 2, when the temperature and humidity of the conditioned air is converged to the target temperature and humidity, when the driving amount of equipment for the humidification and warming is not the minimum drive quantity none The target temperature and humidity are corrected to the low temperature and low absolute humidity side so that the driving amount of the humidifying device or heating device is the minimum driving amount, and the temperature and humidity of the conditioned air has converged to the target temperature and humidity. If not, the target temperature / humidity is corrected to the high temperature / high absolute humidity side so that the driving amount of the humidifying device or heating device converges with the minimum driving amount. The temperature and humidity of the conditioned air are controlled to the target temperature and humidity while suppressing the drive amount.

According to the apparatus of claim 3 , for example, in relation to the temperature and humidity of the outside air, the heating is performed despite the target temperature and humidity being set so as to be achieved only by controlling the humidifying device. When the appliance is driven, the target temperature and humidity are corrected so that the drive amount becomes the minimum drive amount, so that energy consumption due to the wasteful operation of the heater device is suppressed.

It is a schematic diagram of an air-conditioner concerning an embodiment of the present invention. It is explanatory drawing of the target temperature / humidity line used by air-conditioning control. It is a flowchart which determines a target for every pattern of air-conditioning control. It is explanatory drawing of the target setting for every pattern. 3 is a flowchart showing an operation of a control pattern 1. It is explanatory drawing of a control range. It is explanatory drawing of the correction control for the energy saving of the control pattern. It is explanatory drawing of the correction | amendment control for control loss cancellation of the control pattern 1. FIG. 6 is a flowchart showing an operation of a control pattern 2. It is explanatory drawing of the correction control for the energy saving of the control pattern 2. FIG. It is explanatory drawing of the correction | amendment control for control loss cancellation of the control pattern 2. FIG. It is explanatory drawing of the correction | amendment control for control loss cancellation of the control pattern 3. FIG. It is explanatory drawing of the conventional problem corresponding to the control pattern 1. FIG. It is explanatory drawing of the conventional problem corresponding to the control pattern 2. FIG. It is explanatory drawing of the conventional problem corresponding to the control pattern 3. FIG.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 shows a schematic configuration of a control device for controlling the temperature and humidity of conditioned air supplied to a painting booth (not shown) of a car body of an automobile. The control device 1 has an inlet 10a for outside air at one end. The other end has an air-conditioning chamber 10 in which outlets 10b for conditioned air are respectively opened. A filter 11 for removing dust and the like in the outside air is disposed at the inlet 10a. A blower fan 12 is arranged for sucking out air conditioned from the air conditioning chamber 10 and pumping it to the painting booth.

  Further, a washer 13 for humidifying the taken-in air is provided on the inlet 10a side in the air conditioning chamber 10. The washer 13 sucks the water in the water tank 13b by the pump 13a and sprays the mist into the air by the sprayer 13c to heat and humidify the air. The pump 13a is driven by the inverter 13d. ing.

  Here, the washer 13 is operated with at least a minimum operation amount even when humidification is not required to wash away fine dust in the air that has passed through the filter 11 and remove it from the air. Specifically, the minimum drive frequency of the inverter 13d is set to 25 Hz and is always driven at the minimum frequency or higher.

  Furthermore, an after heater 14 for heating the air humidified by the washer 13 is provided on the outlet 10b side in the air conditioning chamber 10, and the temperature and humidity are adjusted by the washer 13 and the after heater 14. Air is supplied to the painting booth.

  In addition to the above configuration, the control device 1 is provided with a control unit 20 that controls the washer 13 and the after-heater 14. The unit 20 controls the temperature and humidity of the outside air taken into the air-conditioning chamber 10. Signals from the outside air temperature sensor 21 and the outside air humidity sensor 22 to be detected are respectively input.

  In addition, the control unit 20 is provided on the outlet 10b side of the air-conditioning chamber 10, and is humidified by the washer 13 and the after heater 14, and the temperature sensor 23 of the conditioned air after heating is detected. A signal from the humidity sensor 24 for conditioned air is also input.

  Here, the humidity detected by the humidity sensors 22 and 24 may be either absolute humidity indicating the weight of water vapor in air of unit weight or relative humidity indicating the ratio of the amount of water vapor in the air to the saturated water vapor amount, If one is detected, the other is calculated from the value and the temperature of the air.

  Further, the storage device 20a of the control unit 20 stores a target temperature and humidity for controlling the conditioned air. As shown in FIG. 2, the target temperature / humidity is set as a line L based on a line (saturated air line) H with a relative humidity of 100% in an air diagram in which temperature and absolute humidity are plotted on the horizontal and vertical axes. In this embodiment, the absolute air humidity is 6 g / Kg less than the saturated air line H.

  In other words, when the temperature and humidity of the air in the painting booth is the temperature and humidity on the target temperature and humidity line L as described above, the evaporation rate when moisture evaporates from the water-based paint becomes almost constant, and stable coating quality is obtained. It is supposed to be done.

  Then, the control unit 20 inputs signals from the outside air temperature sensor 21 and the outside air humidity sensor 22, sets the target temperature and humidity of the conditioned air according to the temperature and humidity of the outside air on the target temperature and humidity line L, and A control signal is output to the washer 13 and the after-heater 14 while inputting signals from the temperature sensor 23 and the humidity sensor 24 for the conditioned air so as to achieve the target temperature and humidity, and the temperature and humidity of the conditioned air are feedback controlled. To do.

  In this feedback control, the control unit 20 sets three control patterns according to the positional relationship of the temperature / humidity point of the outside air with respect to the target temperature / humidity line L on the air diagram, and each control pattern is set on the target temperature / humidity line L. The target temperature and humidity point is set to.

  In this case, when the temperature and humidity of the conditioned air is feedback controlled to the target temperature and humidity point, the control unit 20 performs correction control for suppressing the energy consumption of the washer 13 and the after heater 14 and the target temperature in the basic control. Correction control when the humidity point cannot be matched is performed.

  Next, specific operations of the correction control for energy saving and the correction control for eliminating the control failure by the control unit 20 will be described for each control pattern.

  First, the control for determining the control pattern will be described with reference to the flowchart of FIG.

  In this control, first, in step S1, an outside air temperature / humidity point on the air diagram is determined based on signals from the outside air temperature sensor 21 and the outside air humidity sensor 22. In step S2, it is determined whether this point is below (high temperature / low absolute humidity side) or above (low temperature / high absolute humidity side) of the target temperature / humidity line L shown in FIG.

  If it is below, in step S3, as shown for points P1 and P2 in FIG. 4, the absolute humidity at the outside air temperature point and the enthalpy lines E1 and E2 passing through the outside air temperature point and the target temperature A difference from the absolute humidity at the intersection with the humidity line L is obtained, and whether or not the difference is equal to or greater than a predetermined value (for example, 1.8 g / Kg) corresponding to the lowest drive frequency (25 Hz) of the washer 13 in step S4. judge. That is, it is determined whether or not the target temperature / humidity line L is exceeded when the inverter 13d of the washer 13 is driven at the lowest frequency to humidify the air.

  If the difference ΔH1 is equal to or greater than a predetermined value and does not exceed the target temperature / humidity line L due to humidification at the minimum driving frequency of the washer 13, as indicated by a point P1, the control pattern 1 is set in step S5. As indicated by the point P2, when the difference ΔH2 is less than the predetermined value and exceeds the target temperature / humidity line L due to humidification at the minimum driving frequency of the washer 13, the control pattern 2 is set in step S6.

  On the other hand, when it is determined in step S2 that the outside air temperature / humidity point is on the upper side of the target temperature / humidity line L as indicated by a point P3 in FIG. 4, the control pattern 3 is set in step S7.

  Then, for each control pattern, the target temperature / humidity points Q1, Q2, and Q3 are set in steps S8, S9, and S10 as follows.

  First, in the control pattern 1, as shown in FIG. 4, a point Q1 on the target temperature / humidity line L on the same enthalpy line E1 as the outside air temperature / humidity point P1 is set as the target temperature / humidity point.

  In the control pattern 2, a point R2 obtained by humidification at the minimum drive frequency of the washer 13 is obtained on the same enthalpy line E2 as the outside air temperature humidity point P2, and the target temperature and humidity having the same absolute humidity as this point R2 are obtained. A point Q2 on the line L is set as a target temperature / humidity point.

  In the control pattern 3, as in the case of the control pattern 2, first, the point R3 obtained by humidification with the lowest drive frequency of the washer 13 is obtained on the same enthalpy line E3 as the outside air temperature humidity point P3. Since the dew point is not humidified beyond the dew point on the air line H, the dew point becomes the point R3, and the point Q3 on the target temperature / humidity line L having the same absolute humidity as the dew point R3 is set as the target temperature / humidity point. .

  Then, in each of the control patterns 1 to 3, while detecting the temperature and humidity of the conditioned air by signals from the sensors 23 and 24, the temperature and humidity coincide with the temperatures and humidity of the points Q1 to Q3 set as described above. Thus, the washer 13 and the after heater 14 are feedback-controlled. The control unit 20 detects these operating states based on control signals output to the washer 13 and the after heater 14.

  Next, with respect to each of the control patterns 1 to 3, the correction control for energy saving of the air conditioning control and the operation of the correction control for eliminating the inability to control will be described.

  First, in the case of the control pattern 1, the correction control is performed according to the flowchart of FIG. 5. First, in step S11, the temperature and humidity of the conditioned air are input by signals from the sensors 23 and 24. At that time, when the absolute humidity is detected by the humidity sensor 24, the relative humidity is calculated. When the relative humidity is detected, the absolute humidity is calculated. In any case, the temperature of the conditioned air, the absolute humidity, and Get the relative humidity.

  Next, in steps S12 to S14, it is determined whether or not the temperature, absolute humidity, and relative humidity of the conditioned air are within the predetermined control range shown in FIG.

  That is, in step S12, it is determined whether or not the temperature of the conditioned air is within ± 0.2 ° C. with respect to the temperature at the target temperature / humidity point Q1, and in step S13, the absolute humidity is replaced with the dew point temperature. It is determined whether or not the dew point temperature of the air is within ± 0.2 ° C. with respect to the dew point temperature at the target temperature and humidity point Q1, and in step S14, the relative humidity is ± with respect to the relative humidity at the target temperature and humidity point Q1. Judge whether it is within 0.5% or not.

  When both are determined to be within, that is, when the current temperature and humidity of the conditioned air are within the control range of FIG. 6, in step S15, the output of the after heater 14 is detected, and step S16. Then, it is determined whether or not the output is 0%.

  By the way, in the control pattern 1, as shown in FIG. 4 described above, the target temperature / humidity point Q1 is set on the isoenthalpy line E1 of the outside air temperature / humidity point P1, so that the conditioned air is heated by the washer 13. If the temperature and humidity change along the isoenthalpy line E1, it should be possible to match the temperature and humidity to the value of the target temperature and humidity point Q1, but as shown in FIG. Temperature and low absolute humidity may shift and change.

  In this case, the conditioned air is humidified to the point X1 having the same absolute humidity as the target temperature / humidity point Q1, and the temperature / humidity is matched with the target temperature / humidity point Q1 by heating. Therefore, when the after-heater 14 is operating, it becomes clear that the change in the temperature and humidity of the conditioned air is shifted from the isoenthalpy line E1 toward the low temperature and low absolute humidity.

  Therefore, in the control pattern 1, as described above, it is determined whether or not the output of the after heater is 0%. When it is determined that the output is not 0%, that is, when the after heater 14 is operating, Correction control for moving the target temperature and humidity point Q1 is performed.

  That is, in the flowchart of FIG. 5, when step S17 is executed and the operation state of the after heater 14 continues for 90 seconds, the target temperature is lowered by 0.1 ° C. along the target temperature / humidity line L in step S18.

  Then, until it is determined in step 16 that the output of the after heater 14 has become 0%, the steps S11 to S18 are repeated, so that the target temperature / humidity point Q1 is set to the target temperature / humidity line L as shown in FIG. Along the low temperature, low absolute humidity side, that is, in the same direction as the direction of temperature / humidity deviation of the conditioned air, and finally the new target temperature / humidity on the line where the temperature / humidity of the conditioned air actually changes Set point Q1 '.

  Thereafter, feedback control is performed using the target temperature / humidity point Q1 ′ as a control target, whereby energy-saving control that avoids useless operation of the after-heater 14 shown in FIG. 7 is performed. Thus, the temperature and humidity of the conditioned air are controlled to the target temperature and humidity.

  Here, when it is determined in step S13 that the absolute humidity of the conditioned air has deviated from the control range, in step S14, it is determined that the relative humidity of the conditioned air has deviated from the control range. The correction control is not performed or is terminated, and normal feedback control is performed.

  On the other hand, if it is determined in step S12 that the temperature of the conditioned air has deviated from the control range, then in step S19, it is determined whether or not the temperature has deviated to the higher side. In step S20, it is determined whether or not the relative humidity is lower than the relative humidity at the target temperature and humidity point Q1.

  In these determinations, if both the results are Yes, that is, if the temperature and humidity point of the conditioned air is at the points Y1 and Y1 ′ shown in FIG. 8, the drive frequency of the washer 13 is detected in step S21, and step S22. It is determined whether or not it is the lowest drive frequency. Further, if it is not the lowest drive frequency, in step S23, whether or not the absolute humidity of the conditioned air is within ± 0.2 ° C. as a dew point temperature with respect to the absolute humidity of the target temperature and humidity point Q1, that is, the absolute humidity is within the control range. It is determined whether or not there is.

  And when the drive frequency of the washer 13 is the minimum drive frequency, that is, when the amount of humidification by the washer 13 cannot be reduced, and the temperature and humidity point of the conditioned air cannot be controlled to the target temperature and humidity point Q1 (Y1), or If the absolute temperature is within the control range and the target temperature / humidity point Q1 is not controlled (Y1 ′), the output of the after-heater 14 is detected in steps S24 and S25, and the result is 0%. Determine whether. Then, step S26 is executed when the output is 0%, and when the above state continues for 90 seconds, the target temperature is increased by 0.1 ° C. along the target temperature / humidity line L in step S27.

  As a result, the target temperature / humidity point Q1 is moved along the target temperature / humidity line L to the high temperature, high absolute humidity side, that is, in the same direction as the temperature / humidity shift direction of the conditioned air. Until it is determined that the temperature has decreased to the target temperature, or until it is determined in step S20 that the relative humidity has been raised to the target relative humidity, control for increasing the target temperature in step S27 is performed, and air conditioning is performed. A new target temperature / humidity point Q1 ″ is set at the intersection of the extension line of the line where the temperature / humidity of the air actually changes and the target temperature / humidity line L.

  Then, feedback control is performed with the new target temperature / humidity point Q1 ″ as a control target, and feedback control to the target temperature / humidity is possible only by humidification by the washer 13.

  If it is determined in step S19 that the temperature of the conditioned air is not higher than the target temperature, if it is determined in step S20 that the relative humidity of the conditioned air is not lower than the target humidity, the washer 13 is determined in step S23. When it is determined that the drive frequency is not the lowest frequency and the absolute humidity is out of the control range, or when it is determined in step S25 that the output of the after heater 14 is not 0%, this correction control is performed. Is not performed or is terminated, and normal feedback control is performed.

  Next, the control pattern 2 will be described. Control of this control pattern 2 is performed according to the flowchart of FIG. 9, first, in step S31, the temperature and humidity of the conditioned air are input by signals from the sensors 23 and 24 shown in FIG. 1, and then in steps S32 to S34. As in the case of the control pattern 1, it is determined whether the temperature, absolute humidity, and relative humidity of the conditioned air are within the predetermined control range shown in FIG. If all of temperature, absolute humidity, and relative humidity are within the control range, the washer drive frequency is determined in step S35, and whether or not the frequency is the minimum drive frequency in step S36. Determine.

  That is, in the control pattern 2, as shown in FIG. 4 described above, when the temperature / humidity of the conditioned air changes along the isoenthalpy line E2 due to humidification by the washer 13, the minimum driving frequency for removing dust is used. Since the operation of the washer 13 exceeds the target temperature / humidity line L, the afterheater 14 then heats along the same absolute humidity line. However, as shown in FIG. When deviating from the line E2 to the low temperature and low absolute humidity side, as indicated by the symbol e, the drive frequency of the washer 13 becomes higher than the minimum drive frequency, and the after heater 14 is operated more than necessary. .

  Therefore, in this control pattern 2, the drive frequency of the washer 13 is determined in steps S35 and S36 of the flowchart. If the frequency is not the minimum drive frequency, the temperature and humidity change of the conditioned air deviates from the isoenthalpy line E2. Then, it is determined that the washer 13 and the after-heater 14 are operating more than necessary, and then step S37 is executed. When this state continues for 90 seconds, the target temperature and humidity line L is set along the target temperature / humidity line L in step S38. Reduce temperature by 0.1 ° C.

  Then, by repeating Steps S31 to S38 until it is determined in Step 36 that the driving frequency of the washer 13 has decreased to the minimum driving frequency, the target temperature and humidity point is set to the target temperature and humidity line L as shown in FIG. Move to low temperature and low absolute humidity side. As a result, the drive frequency of the washer 13 is finally set to the lowest drive frequency, and a new target temperature / humidity point Q2 ′ at which the operating amount of the after heater 14 is reduced is set on the target temperature / humidity line L. It will be.

  After that, feedback control is performed with the new target temperature / humidity point Q2 ′ as a control target, whereby the energy saving control in which the drive frequency of the washer 13 is the lowest drive frequency and the operation amount of the after heater 14 is reduced. With this control, the temperature and humidity of the conditioned air are controlled to the target temperature and humidity.

  Here, if it is determined in step S32 that the temperature of the conditioned air has deviated from the control range, or if it is determined in step S34 that the relative humidity of the conditioned air has deviated from the control range, This correction control is not performed or is terminated, and normal feedback control is performed.

  On the other hand, if it is determined in step S33 that the absolute humidity of the conditioned air is outside the control range, then in step S39, whether or not the relative humidity of the conditioned air is higher than the relative humidity at the target temperature and humidity point. Determine whether. If it is higher, that is, if the temperature and humidity point of the conditioned air is at the point Y2 shown in FIG. 11, the drive frequency of the washer 13 is detected in step S40, and it is determined in step S34 whether or not it is the lowest drive frequency.

  When the driving frequency of the washer 13 is the lowest driving frequency, that is, in a state where the relative humidity is higher than the relative humidity at the target temperature and humidity point, the humidification amount by the washer 13 cannot be reduced. If the humidity point Y2 cannot be matched with the target temperature / humidity point Q2, then in steps S42 and S43, the output of the after-heater 14 is detected to determine whether it is 0%. If it is not 0%, that is, if the after-heater is operating, step S44 is executed. When the state continues for 90 seconds, the target temperature is set to 0 along the target temperature / humidity line L in step S45. Increase the temperature by 1 ° C.

  As a result, the target point is moved along the target temperature / humidity line L in the same direction as the direction of the temperature / humidity deviation of the conditioned air, and the relative humidity of the conditioned air has decreased to the target relative humidity in step S39. Until it is determined, control to increase the target temperature in step S49 is performed, and finally the target temperature and humidity at which the temperature and humidity of the conditioned air match between the humidification by the minimum driving frequency of the washer 13 and the heating by the after heater 14 are the same. A new target temperature / humidity point Q2 ″ is set at a point on the line L.

  Then, feedback control is performed with the new target temperature / humidity point Q2 ″ as a control target, whereby feedback control to the target temperature / humidity is performed by humidification at the minimum drive frequency of the washer 13 and heating by the after heater 14. Is possible.

  Here, when it is determined in step S39 that the relative humidity of the conditioned air is not higher than the target relative humidity, in step S41, when it is determined that the driving frequency of the washer 13 is not the minimum driving frequency, in step S43, If it is determined that the after-heater 14 is operating, this correction control is not performed or is terminated.

  The control pattern 3 is the same as the control pattern 2 except that the temperature and humidity of the outside air is on the upper side of the target temperature and humidity line L and the dew point may be reached by the operation of the washer 13 at the minimum drive frequency. Is performed according to the same flowchart as that of the control pattern 2 of FIG.

  That is, in step S36 in the flowchart of FIG. 9, it is determined that the drive frequency of the washer 13 is not the minimum drive frequency. When this state continues for 90 seconds, the target temperature / humidity line L is followed in step S38. Thus, the target temperature is decreased by 0.1 ° C.

  Then, by repeating this, a new target temperature / humidity point Q3 ′ is set on the target temperature / humidity line L when the drive frequency of the washer 13 becomes the lowest drive frequency, as in the case of the control pattern 2. . As a result, as in the case of the pattern control 2, energy saving control is performed by humidification using the minimum drive frequency of the washer 13 and heating by the after heater 14.

  On the other hand, when the change in temperature and humidity of the conditioned air deviates from the isoenthalpy line E3 to the high temperature and high absolute humidity side, the dew point R3 ′ deviates to the high absolute humidity side as shown in FIG. The temperature / humidity point Y3 cannot be matched with the target temperature / humidity point Q3.

  In this case, step S32 to step S39 are executed, and it is determined that the relative humidity is higher than the relative humidity at the target temperature / humidity point Q3. If the drive frequency of the washer 13 is the lowest frequency and the output of the after heater 14 is not 0%, the target temperature is set along the target temperature / humidity line L in step S45 when the state continues for 90 seconds. Increased by 0.1 ° C.

  The control in step S45 is repeated until it is determined that the relative humidity of the conditioned air has decreased to the target relative humidity, so that the humidification by the minimum drive frequency of the washer 13 and the heating by the after heater 14 are finally performed. A new target temperature / humidity point Q3 ″ is set at a point on the target temperature / humidity line L where the temperature / humidity of the conditioned air matches.

  Thereafter, feedback control is performed with this new target temperature / humidity point Q3 ″ as a control target, so that, similarly to the case of the control pattern 2, the humidification by the minimum drive frequency of the washer 13 and the heating by the after heater 14 Feedback control to the target temperature and humidity becomes possible.

  As described above, according to the present invention, when controlling the coating air conditioner, the energy saving control is executed or the uncontrollable state is eliminated. May be used.

1 Air conditioner 13 Washer (humidifying equipment)
14 After heater (heating equipment)
20 Control unit (control means)

Claims (3)

Adjust the temperature and humidity of the outside air with the humidifying and heating equipment, and the temperature and humidity of the generated conditioned air is the target on the target temperature and humidity line set to a lower humidity side than the saturated air line on the air diagram A method of controlling a coating air conditioner that controls the equipment to match a temperature and humidity and supplies the painting booth to the humidifier and / or a humidifier according to a difference between the actual temperature and humidity of the conditioned air and a target temperature and humidity. By driving the temperature device, feedback control is performed so that the temperature and humidity of the conditioned air coincide with the target temperature and humidity, and the minimum driving amount of the humidifying device is set, and the minimum driving amount of the humidifying device is set. When the target temperature and humidity are set so as to be achieved by the operation and the operation of the heating device, the drive state of the humidification device is detected, and the minimum when the drive amount is larger than the minimum drive amount. so that the driving amount, by the target temperature and humidity line The method of coating air-conditioning apparatus and correcting the Atsushi Shimegi and humidity. Adjust the temperature and humidity of the outside air with the humidifying and heating equipment, and the temperature and humidity of the generated conditioned air is the target on the target temperature and humidity line set to a lower humidity side than the saturated air line on the air diagram A method of controlling a coating air conditioner that controls the equipment to match a temperature and humidity and supplies the painting booth to the humidifier and / or a humidifier according to a difference between the actual temperature and humidity of the conditioned air and a target temperature and humidity. By driving the temperature device, feedback control is performed so that the temperature and humidity of the conditioned air coincide with the target temperature and humidity, and the driving state of the humidification device and the heating device is detected, and the temperature of the conditioned air is detected. When the humidity has converged to the target temperature and humidity, if the driving amount of the humidifying device and the heating device is not the minimum driving amount, the driving amount of the humidifying device or the heating device is the minimum driving amount. The target on the target temperature / humidity line When the humidity is corrected to the low temperature and low absolute humidity side, and the temperature and humidity of the conditioned air does not converge to the target temperature and humidity, the driving amount of the humidifying device or the heating device converges with the minimum driving amount. Thus, the control method of the coating air conditioner characterized by correcting the target temperature and humidity to the high temperature and high absolute humidity side on the target temperature and humidity line. When the target temperature and humidity are set so as to be achieved only by controlling the humidifying device, the driving state of the heating device is detected, and when the heating device is driven, the drive amount The method of controlling a coating air conditioner according to claim 1 or 2 , wherein the target temperature and humidity are corrected on the target temperature and humidity line so that the minimum driving amount is obtained.

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