JP5839483B2 - Air conditioner for painting booth - Google Patents

Description

The present invention relates to air conditioning equipment for painting booth.

  Conventionally, various types of air conditioners are known, and among them, air conditioners particularly in automobile paint booths require severe temperature and humidity control in order to maintain product quality. This type of air conditioner is composed of devices such as a heating device, a cooling device, a humidifier (washer), and a blower fan. By operating these devices in combination, the temperature and humidity targeted by the conditioned air can be reduced. Control is performed so as to be (see, for example, Patent Document 1). More specifically, in an air diagram table in which an air diagram representing air state values as coordinates is set, a predetermined position on the air diagram is set in advance as a target point for the temperature and humidity of the conditioned air. The temperature and humidity of the conditioned air are controlled to reach the target point by appropriately combining heating, cooling, and humidification of the outside air taken into the air conditioner.

Japanese Patent No. 3993358

  By the way, in the conventional painting booth air conditioner, in order to control the conditioned air so as to achieve the target temperature and humidity on the relationship of operating a combination of devices such as a heating device, a cooling device, and a humidifying device, There was a problem of requiring a lot of energy. In addition, since these devices are operated in combination, there is also a problem that it takes a considerable amount of time for the control to be stabilized by allowing the conditioned air to reach the target temperature and humidity. In some cases, the target temperature and humidity may not be reached even over a long period of time.

  Furthermore, in the case of a conventional paint booth air conditioner, even if the target point of temperature and humidity control is set to an appropriate value at startup, if the elapsed time after startup becomes long, due to changes in the temperature and humidity of the outside air, There was a problem that the target point deviated from an appropriate value. However, the cause of the deviation has not always been clearly understood. Due to the above circumstances, it has been difficult to achieve severe temperature and humidity control in practice with conventional devices.

The present invention has been made in view of the above problems, and its object is provide a less energy and in a short time, the air-conditioning equipment for painting booth can reliably reach the conditioned air to the temperature and humidity of the target There is to do.

  Regarding the fact that the target point deviates from an appropriate value when the elapsed time since startup in the paint booth air conditioner becomes long, the present inventor conducted an intensive investigation and found that the temperature and humidity of the outside air changed. It was newly found that not only the cause but also the change in the temperature of the humidifying water used for humidifying the outside air was caused. More specifically, in the case of an air conditioner including a humidifying means configured to inject humidifying water and humidify outside air, and to collect the humidifying water and reuse it as humidifying water, it is disposed at the front stage of the water injection portion. The humidifying water is heated under the influence of the heater. For this reason, when the elapsed time after starting the apparatus becomes long, the temperature of the humidifying water rises, and the target point of temperature and humidity deviates from an appropriate value. Then, in order to solve the above-mentioned problem, the inventors of the present application have made further studies, and found that it is only necessary to measure the temperature of the humidifying water and change the target point of the temperature and humidity based on this. In particular, the following invention has been conceived. Incidentally, in the past, no particular attention has been paid to the influence of the temperature change of the humidifying water, and the idea of measuring the temperature of the humidifying water and the idea of changing the target point of the temperature and humidity based on the result are known to those skilled in the art. There was no.

In order to solve the above-mentioned problem, the invention described in means 1 includes a temperature adjusting means for adjusting the temperature of the taken-out outside air, a humidity adjusting means for adjusting the humidity of the outside air, and a predetermined position on an air diagram. By controlling the temperature and humidity to reach the set temperature and humidity target point, temperature and humidity control means for generating conditioned air to be supplied to the painting booth, and the temperature-controlled and humidity-controlled outside air are pumped to the outside An air conditioner for a paint booth comprising a blower fan for performing the above, wherein the humidity control means injects humidification water to humidify the outside air, collects the humidification water, and reuses it as the humidification water. A temperature sensor that measures the water temperature of the humidifying water, and a target point that changes the target point of the temperature and humidity based on the measured value of the temperature sensor. Change means, and In order to reach further by said temperature and humidity at the target point, line Utotomoni, the target point changing means controls for adjusting at least one of water and the ambient air intake amount of the humidifying water, the temperature sensor On the basis of the measured value and the water / air ratio defined as the volume ratio of the humidifying water and the outside air, the inclination of the humidification line passing through the state point of the outside air at that time is predicted, and in the air diagram, Find the position of the intersection of the humidification line and the target temperature / humidity line having the predicted slope, and follow the iso-absolute humidity line of the air diagram to offset the temperature rise of the conditioned air accompanying the heat generation of the blower fan The temperature / humidity target point has been changed to another position near the intersection, and the temperature / humidity control means has been changed to another position near the intersection. The temperature and humidity at the target point When performing control to reach, in a state where the air volume of the blower fan is kept constant, the paint booth air conditioning apparatus characterized by adjusting only water of the humidifying water to the invention.

  Therefore, according to the invention described in the means 1, the target point changing means changes the target point of the temperature and humidity based on the measured value of the water temperature of the humidifying water, so that the deviation of the target point of the temperature and humidity is eliminated. It is corrected. Furthermore, as a result of the control in which the temperature / humidity control means adjusts at least one of the amount of humidifying water and the amount of outside air taken in, the temperature / humidity can be reliably reached at the changed appropriate target point. In addition, the conditioned air can surely reach the target temperature and humidity with less energy and in a short time. The water temperature sensor in the present invention can be installed at any position in the air conditioner as long as the temperature of the humidifying water can be measured. For example, the water temperature sensor is provided in the course of a route for circulating the humidifying water.

In the above invention, the target point changing means of the temperature / humidity control means is based on a measured value of the temperature sensor and a water / air ratio defined as a volume ratio of the humidifying water and the outside air. It predicts the inclination of the humidifying line through the outside air state point, to change the target point of the temperature and humidity in the intersection between the humidifying line and the target temperature and humidity line having an inclination obtained by the prediction in the psychrometric chart.

When setting the temperature / humidity target point at the intersection of the humidification line having a predetermined slope and the target temperature / humidity line in the air diagram, when the temperature of the humidification water rises as the elapsed time becomes longer, A change occurs in the inclination, which causes a deviation in the target value. In that respect, according to the above invention, the target point changing means predicts in advance the inclination of the humidification line passing through the state point of the outside air at that time, and uses the humidification line having the predicted inclination to obtain the target temperature / humidity line. An intersection is calculated. As a result, the deviation of the temperature / humidity target value is corrected so as to be efficiently and reliably eliminated.

  In this case, the temperature / humidity control means includes a first temperature sensor that measures the temperature of the humidifying water, and a wet bulb of outside air from any one of the outside air temperature, relative humidity, absolute humidity, dew point temperature, and enthalpy. It is preferable to have a wet bulb temperature calculating means for calculating the temperature, and a temperature comparing means for comparing the measured value of the temperature sensor and the wet bulb temperature to obtain a temperature difference. The temperature / humidity control means preferably includes water / air ratio calculation means for obtaining a water / air ratio of the taken-in outside air, and the inclination of the humidification line at that time is determined based on the temperature difference and the water / air ratio. Predicting and changing the target point of the temperature and humidity so that the temperature difference from the humidifying line having the predicted inclination in the air diagram becomes a predetermined value along the iso-absolute humidity line; It is preferable to have.

  According to the invention described in the means 3, in the means 1 or 2, the temperature / humidity control means adjusts only the amount of the humidifying water when performing the control to reach the changed target point. The gist.

  Therefore, according to the invention described in the means 3, since there is one type of object to be adjusted in performing the temperature / humidity control, compared with a case where there are a plurality of types of objects to be investigated, less energy and in a short time. Thus, the conditioned air can surely reach the target temperature and humidity. Note that the method of adjusting only the “outside air intake amount” can be considered here, but in the case of a painting booth like the present invention, it is necessary to supply a certain amount of conditioned air in order to improve the painting quality. Because of this, this choice is not preferred. In that respect, according to the present invention that adjusts only the “humidification water amount”, the flow rate of the conditioned air does not change even if the adjustment is made, so that a constant amount of conditioned air can be supplied, and the coating quality is improved. This is suitable for achieving the above.

  By the way, the target point changing means of the temperature and humidity control means is such that the humidification line having the predicted inclination intersects without departing from the control upper limit value to the control lower limit value of the target temperature and humidity line. Change the target point of temperature and humidity as described above. On the other hand, when the humidification line having the predicted slope deviates from the control upper limit value or the control lower limit value of the target temperature / humidity line, for example, the following is preferable.

The invention described in means 2 is that, in the means 1 , the target point changing means of the temperature / humidity control means is higher than a point where the humidification line having the predicted inclination becomes a control upper limit value of the target temperature / humidity line. When it deviates to the enthalpy side, the gist is to change the target point of the temperature and humidity to a point that becomes the control upper limit value.

If than that humidifying line with predicted tilt is controlled upper limit of the target temperature and humidity line deviates to the high enthalpy side, it is possible that the target point of the appropriate temperature and humidity becomes difficult or impossible settings, it means 2 According to the invention described in (1), even in such a case, it is possible to reliably set an appropriate temperature / humidity target point by changing the temperature / humidity target point to a point that becomes the control upper limit value.

  Here, when performing the control to make the temperature and humidity reach the changed target point, the temperature and humidity control means first adjusts the amount of the humidifying water, and then cools the outside air by the temperature control means. It is preferable to do that.

The invention described in means 3 is that, in the means 1 or 2 , the target point changing means of the temperature / humidity control means is such that the humidification line having the predicted inclination becomes a control lower limit value of the target temperature / humidity line. In the case where the value falls outside the low enthalpy side, the gist is to change the target point of the temperature and humidity to a point that becomes the control lower limit value.

If than that humidifying line with predicted tilt is lower control limit of the target temperature and humidity line deviates to the low enthalpy side, the target point of the appropriate temperature and humidity may be difficult or impossible setting means 3 According to the invention described in (1), even in such a case, it is possible to reliably set an appropriate target point of temperature and humidity by changing the target point of temperature and humidity to a point that becomes the control lower limit value.

  Here, when performing the control to reach the changed target point to the temperature and humidity, the temperature and humidity control means first heats the outside air by the temperature adjustment means, and then adjusts the amount of the humidifying water. It is preferable to carry out.

As described in detail above, according to the first to third aspects of the present invention, there is provided a coating booth air conditioner that can reliably reach the target temperature and humidity in a short amount of energy and in a short time. it is possible.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the coating booth air conditioner of one Embodiment which actualized this invention. The air line figure for demonstrating the temperature / humidity control method by the coating booth air conditioner of 1st Embodiment. The air line figure for demonstrating the temperature-humidity control method by the coating booth air conditioner of 2nd Embodiment. The air line figure for demonstrating the temperature / humidity control method by the coating booth air conditioner of 3rd Embodiment.

[First Embodiment]
Hereinafter, an air conditioner for a painting booth embodying the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a schematic diagram of a coating booth air conditioner 1 according to the present embodiment. The air conditioner 1 is an apparatus for generating conditioned air A1 to be supplied to the painting booth 2.

  The painting booth 2 is provided on the upper side of the painting chamber 11 for painting an object to be coated (for example, automobile parts, etc.), and flows down to the painting chamber 11 (a certain direction from above to below). An air supply chamber 12 for supplying air and an exhaust chamber 13 provided at the lower side of the coating chamber 11 for exhausting the air in the coating chamber 11 are provided. In the painting booth 2 of the present embodiment, the conditioned air A1 discharged from the air conditioner 1 is supplied into the painting chamber 11 by downflow.

  Then, in the coating chamber 11, the object to be coated is applied by spraying a paint mist from a coating machine (not shown). At this time, the paint mist that has been oversprayed and scattered from the coating machine is discharged from the coating chamber 11 to the exhaust chamber 13 by the downflow conditioned air A1 that acts in the coating chamber 11. In the exhaust chamber 13, the paint mist contained in the air is captured using the booth circulating water, and the paint is collected. Further, the air A2 discharged from the exhaust chamber 13 is released to the atmosphere by the blower fan 14.

  The air conditioner 1 is an apparatus for adjusting the air (outside air A0) taken from outside the apparatus to a predetermined temperature (for example, around 23 ° C.) and a predetermined humidity (for example, around 70% RH). A filter 22, a preheater 23, a washer 24, a cooling coil 26, a reheater 27, and a blower fan 28 are provided.

  The primary filter 21 and the secondary filter 22 are means for removing and purifying dust contained in the taken-in outside air. The pre-heater 23 is a kind of temperature adjusting means for adjusting the temperature of the taken-in outside air. More specifically, the pre-heater 23 heats the outside air purified through the primary filter 21 and the secondary filter 22 and raises the temperature. Means. The washer 24 is a kind of humidity adjusting means for adjusting the humidity of the taken-out outside air. More specifically, the washer 24 is a humidifying means for increasing the humidity of the outside air by jetting water to the outside air that has passed through the preheater 23. The cooling coil 26 is a kind of temperature adjusting means for adjusting the temperature of the taken-in outside air. More specifically, the cooling coil 26 is a cooling means for cooling the outside air passing through the washer 24 and lowering the temperature. The reheater 27 is a kind of temperature adjusting means for adjusting the temperature of the taken-in outside air. More specifically, the reheater 27 is a heating means for heating the outside air that has passed through the cooling coil 26 to increase the temperature. The blower fan 28 is a means for pressure-feeding the temperature-controlled and humidity-controlled outside air (that is, the conditioned air A <b> 1) to the painting booth 2. In the air conditioner 1, steam is supplied to the preheater 23 and the reheater 27 from a heat source (not shown), and cold water is supplied to the cooling coil 26 from a cold heat source (not shown).

  In particular, the washer 24 of the present embodiment includes a water storage unit 24a, a circulation pipe 24b, a pump 24c, a solenoid valve 24d, and a water injection unit 24e. The water injection unit 24e plays a role of injecting the humidifying water W1 from the nozzle. The water storage unit 24a is disposed below the water injection unit 24e and stores humidification water W1 used for humidification. The circulation pipe 24b connects the water injection section 24e and the water storage section 24a in a flow path. A pump 24c for pumping the humidifying water W1 of the water storage section 24a to the water injection section 24e is provided on the upstream side in the middle of the circulation pipe 24b. Similarly, an electromagnetic valve 24d for opening and closing a flow path composed of the circulation pipe 24b is provided on the downstream side in the course. Therefore, when the electromagnetic valve 24d is opened and the pump 24c is driven, the humidifying water W1 is injected from the nozzle of the water injection unit 24e, and the outside air A0 is appropriately humidified according to the spray amount. Most of the sprayed humidifying water W1 is collected by collecting in the water storage section 24a, and is used again as the humidifying water W1.

  In the air conditioner 1, sensing means are provided at several locations. Specifically, a temperature sensor 34 and a humidity sensor 35 are provided in the vicinity of the intake port for the outside air A0. On the upstream side of the washer 24, a temperature sensor 36 for measuring the temperature of the outside air A0 before humidification is provided. The cooling coil 26 is provided with a temperature sensor 37 for measuring the temperature of the outside air A0 after humidification. The blower fan 28 on the outlet side of the conditioned air A1 is provided with a temperature sensor 38 and a humidity sensor 39 for measuring the temperature and humidity of the conditioned air A1. Furthermore, in this air conditioner 1, a temperature sensor 40 for measuring the water temperature of the humidifying water W1 is provided in the middle of the circulation pipe 24b.

  The air conditioner 1 includes a control device 41 (temperature / humidity control means) constituted by a known computer including a CPU 42, a ROM 43, a RAM 44, and the like. The control device 41 is electrically connected to a control target (that is, the preheater 23, the electromagnetic valve 24d and the pump 24c in the washer 24, the cooling coil 26, the reheater 27, and the blower fan 28) via respective driver circuits (not shown). Has been. Further, the sensors 34 to 40 are electrically connected to the control device 41. In the control device 41 configured as described above, the controlled object is variably controlled based on the measurement results of the temperature and humidity output from the sensors 34 to 40, and the conditioned air A1 adjusted to a predetermined temperature and humidity is obtained. It is to be generated.

  Next, temperature / humidity control performed by the control device 41 will be described. A program for controlling the temperature and humidity is stored in the ROM 43 constituting the control device 41, and the CPU 42 reads the program from the ROM 43 and executes it sequentially. In addition to this program, the ROM 43 stores data (air diagram table) related to an air diagram 61 that represents air state values in coordinates. As shown in FIG. 2, a target temperature / humidity line L1, which is a set of ideal state points of the temperature / humidity of the conditioned air A1, is set in advance on the air diagram 61. The upper end of the target temperature / humidity line L1 is defined as the control upper limit value Pmax, and the lower end is defined as the control lower limit value Pmin. Incidentally, the enthalpy increases as it goes to the upper right of the air diagram 61, and conversely decreases as it goes to the lower left. In the air diagram 61 of FIG. 2, the point in the lower right region of the target temperature / humidity line L1 indicates the outside air state point P1.

  The air line diagram 61 shows a humidification line Lh when humidification is performed from the outside air state point P1. The humidification line Lh is a straight line going up to the left from the outside air state point P1 to the change point P2 after humidification, and has a predetermined inclination α with respect to the horizontal axis of the air diagram 61. In addition, this inclination (alpha) changes with the influence of the water temperature Twater of the humidification water W1. For example, when the inclination α of the humidification line Lh has changed significantly beyond the assumed range, the position of the change point P2 after humidification at the upper end position of the humidification line Lh is shifted from the target temperature / humidity line L1. (Humidification line Lh ′ indicated by a broken line in the figure). Therefore, if humidification is performed using the temperature / humidity target point P0, the conditioned air A1 is adjusted to a temperature / humidity different from the originally intended state. Therefore, the control device 41 of the present embodiment performs control for calculating and predicting the inclination α of the humidification line Lh at that time in the following procedure.

  First, the CPU 42 which is a wet bulb temperature calculation means includes any one of a temperature sensor 40 (first temperature sensor) for measuring the water temperature Twater of the humidifying water W1, and the temperature, relative humidity, absolute humidity, dew point temperature, and enthalpy of the outside air A0. The wet bulb temperature TIwet of the outside air A0 is calculated from these two. For example, in this embodiment, the measured value of the temperature sensor 34 is used as the temperature of the outside air A0.

  Next, the CPU 42, which is also a temperature comparison means, compares the measured value Twater of the temperature sensor 40 with the wet bulb temperature TIwet to obtain a temperature difference TΔ. Further, the CPU 42 which is also the water / air ratio calculating means obtains the water / air ratio β of the taken-in outside air A0. This water-air ratio β can be grasped as a ratio (volume ratio) between the amount of humidified water W1 and the amount of outside air taken in, and is calculated from the drive amount of the washer 24 and the drive amount of the blower fan 28, for example. be able to.

  Subsequently, the CPU 42 which is also the target point changing means calculates and predicts the inclination α of the humidification line Lh at that time based on the temperature difference TΔ and the water / air ratio β, and the humidification line Lh having the predicted inclination α. The target point P0 of the temperature and humidity is changed to the intersection of the target temperature and humidity line L1.

  After the temperature / humidity target point is changed in this way, the CPU 42 basically adjusts only the amount of the humidifying water W1 when performing control to reach the changed temperature / humidity target point P0. That is, the degree of humidification is controlled by adjusting the opening of the electromagnetic valve 24d in the washer 24 and the drive amount of the pump 24c while keeping the air volume of the blower fan 28 constant. As a result of the above control, conditioned air A1 suitable for supply to the painting booth 2 is generated.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) According to the coating booth air conditioner 1 of the present embodiment, the CPU 42 as the target point changing means changes the temperature / humidity target point P0 based on the measured value of the water temperature Twater of the humidifying water W1. Thereby, it correct | amends in the direction in which the shift | offset | difference of the target point P0 of temperature / humidity is eliminated. Furthermore, as a result of performing control to adjust at least one of the water amount of the humidifying water W1 and the intake amount of outside air, the temperature and humidity can be reliably reached at the changed appropriate target point P0. In addition, the conditioned air A1 can reliably reach the target temperature and humidity with less energy and in a short time.

  (2) In the coating booth air conditioner 1 of the present embodiment, based on the measured value of the temperature sensor 40 (that is, the measured value of the water temperature Twater of the humidifying water W1) and the water / air ratio β, the state of the outside air at that time The inclination α of the humidification line Lh passing through the point P1 is predicted. And the target point P0 of temperature / humidity is changed to the intersection of the said humidification line Lh and the target temperature / humidity line L1 which has the estimated inclination (alpha). Therefore, according to such a calculation and prediction method, it is possible to correct the deviation of the temperature / humidity target point P0 in such a direction that it can be efficiently and reliably eliminated.

  (3) In the coating booth air conditioner 1 of the present embodiment, the CPU 42 adjusts only the amount of the humidifying water W1 when performing control to reach the changed target point P0 with temperature and humidity. That is, there is one type of object to be adjusted when performing temperature and humidity control. Therefore, the conditioned air A1 can reliably reach the target temperature and humidity in a shorter amount of energy and in a shorter time than when there are a plurality of types of objects to be investigated. Further, even if the adjustment is made, the flow rate of the conditioned air A1 does not change, so that a certain amount of the conditioned air A1 can be supplied, which is suitable for improving the coating quality.

[Second Embodiment]
In the first embodiment, the humidity / humidity line Lh having the predicted inclination α is a temperature / humidity when the target temperature / humidity line L1 intersects without departing from the control upper limit value Pmax to the control lower limit value Pmin. The target point change was explained.

  By the way, when the humidification line Lh having the predicted inclination α deviates from the control upper limit value Pmax or the control lower limit value Pmin of the target temperature / humidity line L1, for example, the following is preferable.

  The air diagram 61 of FIG. 3 shows an example in which the humidification line Lh having the predicted inclination α deviates to the high enthalpy side from the point where the control upper limit value Pmax of the target temperature / humidity line L1 is reached. In this case, the control to reach the temperature / humidity on the target temperature / humidity line L1 cannot be performed only by adjusting the amount of the humidifying water W1. Therefore, the CPU 42 performs control to change the temperature / humidity target point P0 to a point where the control upper limit value Pmax is reached. When performing control to reach the changed target point P0, the CPU 42 first adjusts the drive amount of the washer 24 to adjust the water amount of the humidifying water W1. At this time, the temperature and humidity state point moves from P0 to P0 ′ along the humidification line Lh. Next, the CPU 42 operates the reheater 27 which is a temperature adjusting means to cool the outside air A0. At this time, the temperature and humidity state point moves from P0 ′ to P0 along the cooling line Lc. As a result, even if it is difficult or impossible to set an appropriate temperature / humidity target point P0, the target temperature / humidity line can be obtained by changing the temperature / humidity target point P0 to a point where the control upper limit value Pmax is reached. The temperature and humidity can surely reach a point on L1. In the above temperature and humidity control, not only humidification but also cooling is performed, so there are two types of objects to be adjusted. However, even if there is relatively little energy to be input, air conditioning is performed to the target temperature and humidity. Air can be reliably reached.

  On the other hand, the air diagram 61 of FIG. 3 also shows an example in which the humidification line Lh having the predicted inclination α deviates to the low enthalpy side from the point where the control lower limit value Pmin of the target temperature / humidity line L1 is reached. ing. Also in this case, the control for reaching the temperature and humidity on the target temperature and humidity line L1 cannot be performed only by adjusting the amount of the humidifying water W1 (see the humidification line Lh ′ in the figure). Therefore, the CPU 42 performs control to change the temperature / humidity target point P0 to a point where the control lower limit value Pmin is reached. When performing control to reach the changed target point P0, the CPU 42 first activates the preheater 23 or the reheater 27, which is a temperature adjusting means, to heat the outside air A0. At this time, the temperature and humidity state point moves from P1 'to P1 along the heating line Ld. Next, the drive amount of the washer 24 is adjusted to adjust the water amount of the humidifying water W1. At this time, the temperature and humidity state point moves from P1 to P0 along the humidification line Lh. As a result, even if it is difficult or impossible to set an appropriate temperature / humidity target point P0, the target temperature / humidity line is obtained by changing the temperature / humidity target point P0 to a point where the control lower limit value Pmin is reached. The temperature and humidity can surely reach a point on L1. In the above temperature / humidity control, heating is performed not only for humidification, but there are two types of objects to be adjusted. However, even if the energy to be input is relatively small, air conditioning is performed to the target temperature / humidity. The air A1 can be reliably reached.

[Third Embodiment]
Next, the temperature and humidity control method of the third embodiment will be described with reference to FIG.

  Also in the present embodiment, basically the same procedure as in the first embodiment is performed, and the inclination α of the humidification line Lh at that time is calculated and predicted based on the temperature difference TΔ and the water / air ratio β. Subsequently, the CPU 42 as the target point changing means changes the temperature / humidity target point P0 based on the humidification line Lh having the predicted inclination α. However, in the first embodiment, the temperature / humidity target point P0 is changed to the intersection of the humidification line Lh and the target temperature / humidity line L1, but here the temperature / humidity target is located at another position near the intersection. Change the point P0. That is, “another position near the intersection” refers to a position moved by a predetermined value from the intersection to the low temperature side (left side in the air diagram 61) along the iso-absolute humidity line of the air diagram 61. . The reason for changing the temperature / humidity target point P0 to such a position is as follows. In general, when the blower fan 28 is driven, heat is generated by the fan motor or the like, but the influence of this heat becomes a level that cannot be ignored, and the temperature of the conditioned air A1 that passes through the fan fan 28 increases (ie, “resulting” When "heating" occurs), the target point P0 of temperature and humidity deviates from an appropriate value. Therefore, the temperature / humidity target point P0 is changed by changing the temperature / humidity target point P0 after taking into consideration the “outgoing heating” from the beginning.

  After the temperature / humidity target point is changed in this way, the CPU 42 basically adjusts only the amount of the humidifying water W1 when performing control to reach the changed temperature / humidity target point P0. That is, the degree of humidification is controlled by adjusting the opening of the electromagnetic valve 24d in the washer 24 and the drive amount of the pump 24c while keeping the air volume of the blower fan 28 constant. As a result of performing the above-mentioned control and “successful heating”, the temperature and humidity come to the intersection with the target temperature / humidity line L1, and the conditioned air A1 suitable for supply to the painting booth 2 is generated. Can do.

  In addition, you may change each embodiment of this invention as follows.

  -Although the air conditioner 1 of the said embodiment was provided with the primary filter 21, the secondary filter 22, the preheater 23, the washer 24, the cooling coil 26, the reheater 27, and the ventilation fan 28, it is not limited to this but is different An apparatus configuration may be adopted. For example, one of the primary filter 21 and the secondary filter 22 may be omitted. Moreover, you may provide the water injection part 24e in the washer 24 two or more steps instead of one step. Further, the cooling coil 26 provided in two stages may be only one stage, or may be omitted if unnecessary. The reheater 27 may be omitted if unnecessary. In other words, the air conditioner is not limited to the one having the function of heating, humidifying and cooling the outside air A0 taken in, but the one having the heating and humidifying function and not having the cooling function, having the cooling and humidifying function and having the heating function. It may not have a temperature function. Further, the air conditioner may have a function of dehumidifying the taken-in outside air A0 in addition to the function of heating, humidifying and cooling.

  -In the air conditioner 1 of the said embodiment, the temperature sensor 40 for measuring the water temperature Twater of the humidification water W1 was provided in the upstream of the pump 24c in the middle of the circulation piping 24b, specifically the circulation piping 24b. However, it is not limited to this position, and may be provided at another position as long as the water temperature Twater of the humidifying water W1 can be measured. For example, the temperature sensor 40 can be provided in the vicinity of a location where the water storage unit 24a, the pump 24c, the electromagnetic valve 24d, and the water injection unit 24e are present.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the respective embodiments described above are listed below.

(1) In the means 1, the temperature / humidity control means includes a first temperature sensor that measures the water temperature of the humidifying water, and any two of the outside air temperature, relative humidity, absolute humidity, dew point temperature, and enthalpy. It has wet bulb temperature calculation means for calculating the wet bulb temperature of the outside air, and has temperature comparison means for comparing the measured value of the temperature sensor with the wet bulb temperature to obtain a temperature difference.
(2) In the means 1, the temperature / humidity control means includes a first temperature sensor that measures the temperature of the humidifying water, and any two of the temperature of the outside air, relative humidity, absolute humidity, dew point temperature, and enthalpy. A temperature comparison means for calculating a temperature difference by comparing the measured value of the temperature sensor with the temperature of the wet bulb, and a ratio of water to air of the taken-in outside air; Water / air ratio calculation means for obtaining
(3) In the means 1, the temperature / humidity control means includes a first temperature sensor that measures the water temperature of the humidifying water, and any two of the outside air temperature, relative humidity, absolute humidity, dew point temperature, and enthalpy. A temperature comparison means for calculating a temperature difference by comparing the measured value of the temperature sensor with the temperature of the wet bulb, and a ratio of water to air of the taken-in outside air; And a water / air ratio calculating means for determining the inclination of the humidification line at that time based on the temperature difference and the water / air ratio, and the humidification line having the predicted inclination in the air diagram The target point changing means for changing the target point of the temperature and humidity so that the temperature difference becomes a predetermined value along the isoabsolute humidity line.
(4) In the means 4, the temperature / humidity control means first adjusts the amount of the humidifying water when performing the control to reach the changed target point to the temperature / humidity, and then adjusts the outside air by the temperature adjustment means. To cool.
(5) In the means 5, when the temperature and humidity control means performs control to reach the changed target point, the temperature and humidity control means first heats the outside air by the temperature control means, and then the amount of the humidifying water. To adjust.
(6) A program for causing a computer to execute the method described in the means 6.

DESCRIPTION OF SYMBOLS 1 ... Paint booth air conditioner 2 ... Paint booth 23 ... Preheater as temperature control means 24 ... Humidification means (washer) which comprises humidity control means
DESCRIPTION OF SYMBOLS 26 ... Cooling coil as temperature control means 27 ... Reheater as temperature control means 40 ... Temperature sensor 41 ... Control apparatus as temperature / humidity control means 42 ... CPU as target point change means
61 ... Air diagram A0 ... Outside air A1 ... Air-conditioned air P0 ... Temperature / humidity target point W1 ... Humidification water α ... Inclination

Claims (3)

Temperature control means for adjusting the temperature of the taken-in outside air, humidity control means for adjusting the humidity of the outside air, and control for causing the temperature and humidity to reach a target point of the temperature and humidity set at a predetermined position on the air diagram A temperature and humidity control means for generating conditioned air to be supplied to the painting booth, and a blower fan for pumping the temperature- controlled and humidity-controlled outside air to the outside ,
The humidity control unit includes a humidification unit configured to inject humidification water to humidify the outside air, collect the humidification water, and reuse the humidification water.
The temperature / humidity control means includes a temperature sensor for measuring the temperature of the humidifying water, and target point changing means for changing the target point of the temperature / humidity based on a measurement value of the temperature sensor. in order to reach the temperature and humidity to the point, the humidifying water of water and line control for adjusting at least one of the uptake of the outside air Utotomoni,
The target point changing means includes
Based on the measured value of the temperature sensor and the water / air ratio defined as the volume ratio of the humidifying water and the outside air, predicting the slope of the humidification line passing through the state point of the outside air at that time,
Finding the position of the intersection of the humidification line and the target temperature / humidity line having the predicted slope in the air diagram,
In order to cancel out the temperature rise of the air-conditioning air accompanying the heat generation of the blower fan, another position near the intersection moved by a predetermined value from the intersection to the low temperature side along the isobaric humidity line of the air diagram, Change the target point of temperature and humidity,
When the temperature and humidity control means performs control for reaching the temperature and humidity to the target point that has been changed to another position near the intersection, the air flow rate of the blower fan is maintained constant, An air conditioner for a paint booth characterized by adjusting only the amount of humidifying water . The target point changing means of the temperature / humidity control means, when the humidified line having the predicted inclination deviates to a higher enthalpy side than a point at which the target temperature / humidity line becomes a control upper limit value, the control upper limit value. paint booth air-conditioning apparatus according to claim 1, characterized in that to change the target point of the temperature and humidity in that a. The target point changing means of the temperature / humidity control means, when the humidified line having the predicted inclination deviates to a lower enthalpy side than a point where the target temperature / humidity line becomes a control lower limit value, the control lower limit value. The coating booth air conditioner according to claim 1 or 2 , wherein the target point of the temperature and humidity is changed to a point where

Images