Air conditioning system for paint booth

Abstract

To provide an air conditioning system for a paint booth which enables reduction of energy needed for air conditioning in summer season.SOLUTION: An air conditioning system 11 for a paint booth includes a paint booth air conditioner 21, a dehumidified air generator 31, and a control device 15. The paint booth air conditioner 21 includes a washer 23 which adjusts temperature / humidity of outdoor air and sends air-conditioned air to a paint booth 1. The dehumidified air generator 31 has heat storage type dehumidification tanks 32A, 32B which take outdoor air thereinto to dehumidify the outdoor air and supplies dehumidified air to an outdoor air introduction port 21a of the paint booth air conditioner 21. The control device 15 controls operations of the paint booth air conditioner 21 and the dehumidified air generator 31. Under predetermined conditions, the control device 15 performs control for mixing dehumidified air with outdoor air, introducing the mixed outdoor air from the outdoor air introduction port 21a, and making the introduced outdoor air approach target temperature / humidity by performing cooling and humidification by the washer 23.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air conditioning system for a paint booth. [Background technology]

[0002] Generally, a painting facility is equipped with devices such as a painting booth for applying paint to objects to be painted, such as automobile bodies, and a drying furnace for drying the paint on the objects to be painted that has passed through the painting booth. In such painting facilities, air whose temperature and humidity have been adjusted by a painting booth air conditioner is sent into the painting booth to perform painting. In addition, the painting booth air conditioner is composed of devices such as a preheater, a washer, a cooling coil, a reheater, and a blower fan, and these devices are operated in combination to control the conditioned air to a target temperature and humidity (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3993358 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional paint booth air conditioning, when the outside air temperature and absolute humidity are higher than the set temperature and humidity, such as in summer, temperature and humidity control is usually performed by cooling and humidifying with a washer, dehumidifying and cooling with a cooling coil, and heating with a reheater, etc. (See r1 to r4 in the psychrometric chart in Figure 2).

[0005] However, this type of temperature and humidity control requires the operation of a cooling coil and a reheater, which places a heavy load on these devices, especially on the cooling coil, making it impossible to reduce the cooling energy and heating energy required for air conditioning, and making it difficult to hold down the costs required for air conditioning.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide an air conditioning system for a paint booth that can reduce the energy required for air conditioning in summer. [Means for solving the problem]

[0007] In order to solve the above problems, the invention described in Means 1 provides an air conditioning system for a paint booth, comprising: an air conditioner for a paint booth that includes at least a washer that adjusts the temperature and humidity of outside air introduced from an outside air inlet and sends conditioned air to a paint booth; a dehumidified air generating device that has a heat storage dehumidification tank that takes in outside air and dehumidifies it and supplies dehumidified air to the outside air inlet of the air conditioner for a paint booth; and a control device that controls the operation of the air conditioner for a paint booth and the dehumidified air generating device, wherein the control device mixes the dehumidified air with outside air under specified conditions and introduces the mixed air from the outside air inlet, and cools and humidifies the introduced outside air using the washer to bring it closer to a target temperature and humidity.

[0008] Therefore, according to the invention described in Means 1, the dehumidified air generated by the heat storage type dehumidification tank of the dehumidified air generating device is mixed with outside air and introduced into the outside air inlet of the paint booth air conditioner, whereby the outside air with high temperature and high absolute humidity is once dehumidified and heated. The dehumidified and heated outside air is then further cooled and humidified by the washer. This makes it possible to approach the target temperature and humidity mainly by the washer, without relying on dehumidification and cooling by the cooling coil or heating by the reheater, etc. This reduces the burden on the cooling coil, reheater, etc., and reduces the energy required for air conditioning in summer.

[0009] The invention described in Means 2 is based on Means 1, and is characterized in that the dehumidified air generating device includes a heat exchanger that removes heat from the dehumidified air discharged from the heat storage type dehumidification tank by using outside air and then supplies the dehumidified air to the outside air inlet. Therefore, according to the invention described in Means 2, the dehumidified air from which heat has been removed is mixed with outside air and introduced, thereby dehumidifying and heating the outside air with high temperature and high absolute humidity. As a result, the amount of temperature rise of the outside air during the dehumidification and heating process is reduced, and the load on the washer that performs cooling and humidification can be reduced.

[0010] The invention described in Means 3 is characterized in that, in Means 2, the heat storage dehumidification tank has a mechanism that makes it possible to replace the dehumidification unit housed in the tank, and the control device judges the dehumidification capacity of the heat storage dehumidification tank based on the measurement value of a temperature and humidity sensor provided in a position immediately before the supply of the dehumidified air to the outside air inlet or the measurement value of the operating time of the heat storage dehumidification tank, and when it is determined that the dehumidification capacity has fallen below a predetermined value, it instructs replacement of the dehumidification unit. Therefore, according to the invention described in Means 3, it is possible to quickly know when to replace the dehumidification unit, making it easier to maintain the dehumidification capacity of the heat storage dehumidification tank.

[0011] The invention described in Means 4 is the same as Means 2, in which the dehumidified air generating device has a plurality of the heat storage dehumidification tanks, a plurality of supply paths for supplying the dehumidified air from the plurality of the heat storage dehumidification tanks to the outside air inlet, and a path switching mechanism for switching the plurality of supply paths, and the control device determines the dehumidification capacity of the heat storage dehumidification tank in use based on the measurement value of a temperature and humidity sensor provided at a position immediately before the dehumidified air is supplied to the outside air inlet, and when it is determined that the dehumidification capacity of the heat storage dehumidification tank in use has become equal to or lower than a predetermined value, the path switching mechanism is operated to switch the supply path, thereby causing the dehumidified air to be supplied from the other heat storage dehumidification tank to the outside air inlet of the paint booth air conditioner. Therefore, according to the invention described in Means 4, when the dehumidification capacity of the heat storage dehumidification tank in use decreases, the supply path is switched so that dehumidified air is quickly supplied from the other heat storage dehumidification tank. Therefore, the dehumidified air generating device can continuously generate dehumidified air, and the dehumidified air can be continuously supplied to the outside air inlet.

[0012] The invention described in Means 5 is the same as Means 2, in which the heat exchange means of the dehumidified air generating device includes an air-air heat exchanger that removes heat from the dehumidified air by performing heat exchange between the outside air and the dehumidified air, and a heat removal fan that sends outside air to the air-air heat exchanger, and the control device controls the air volume of the heat removal fan to adjust the temperature of the dehumidified air mixed with the outside air taken in by the paint booth air conditioner based on the measurement value of a first temperature and humidity sensor provided at a position immediately before the dehumidified air is supplied to the outside air inlet and the measurement value of a second temperature and humidity sensor provided at the outside air inlet of the paint booth air conditioner. Therefore, according to the invention described in Means 5, the amount of dehumidified air that has been removed from heat is adjusted to an appropriate amount by controlling the air volume of the heat removal fan, so that dehumidification and heating of high temperature and high absolute humidity outside air can be performed accurately and stably.

[0013] The invention described in Means 6 is based on any one of Means 1 to 5, and is characterized in that the paint booth air conditioner includes a cooling coil for cooling the outside air and a reheater for heating the outside air, the dehumidified air generating device takes in the outside air into the heat storage type dehumidification tank and has a dehumidified air supply fan for pressure-feeding the dehumidified air generated in the heat storage type dehumidification tank to the outside air inlet of the paint booth air conditioner, and the control device calculates the mixing amount of the dehumidified air based on the measured values ​​of a first temperature and humidity sensor and an air flow sensor provided immediately before the dehumidified air is supplied to the outside air inlet so as to obtain an enthalpy that does not operate the cooling coil and the reheater, and controls the air flow rate of the dehumidified air supply fan to obtain the mixing amount. Therefore, according to the invention described in Means 6, the outside air taken in by the dehumidified air supply fan becomes dehumidified air through the heat storage type dehumidification tank, and the dehumidified air is pressure-feeded to the outside air inlet at an appropriate air flow rate. At this time, since a mixed gas is obtained by mixing the dehumidified air and the outside air in an appropriate amount, it is possible to approach the target temperature and humidity without operating the cooling coil and the reheater.

[0014] The invention described in Means 7 is based on any one of Means 1 to 5 and includes a heat exchanger that obtains heated outdoor air by exchanging heat between a fluid containing factory waste heat and outdoor air, and the control device performs control to supply the heated outdoor air obtained by using the factory waste heat to the heat storage dehumidification tank to restore the dehumidification capacity when it is determined that the dehumidification capacity of the heat storage dehumidification tank has fallen below a predetermined value. Therefore, according to the invention described in Means 7, the dehumidification capacity of the heat storage dehumidification tank can be restored by effectively utilizing the thermal energy contained in the factory waste heat. Therefore, there is no need to input extra energy to restore the dehumidification capacity of the heat storage dehumidification tank, and the energy required for air conditioning can be further reduced.

[0015] The invention described in Means 8 is based on any one of Means 1 to 5 and includes a heat exchanger for obtaining heated outdoor air by performing heat exchange between a fluid containing factory waste heat and outdoor air, and the control device controls the heating outdoor air obtained by utilizing the factory waste heat to be mixed with the outdoor air and introduced from the outdoor air inlet under a predetermined condition. Therefore, according to the invention described in Means 8, a mixture of the heating outdoor air and outdoor air can be obtained by introducing the heating outdoor air obtained by effectively utilizing the thermal energy contained in the factory waste heat from the outdoor air inlet. Therefore, there is no need to input extra energy to generate the heating outdoor air, and the energy required for air conditioning can be reduced, for example, even in the intermediate season and winter.

[0016] The invention described in Means 9 is based on any one of Means 1 to 5, and the control device controls the dehumidified air generating device to perform dehumidification and heating using the dehumidified air from the heat storage dehumidification tank when the enthalpy of the outside air is high relative to the target temperature and humidity, and controls the washer to perform cooling and humidification only by the washer until the target humidity is reached. Therefore, according to the invention described in Means 9, the dehumidified air from the heat storage dehumidification tank is mixed with the outside air to perform dehumidification and heating, and then the target humidity can be reached by performing cooling and humidification only by the washer. Therefore, the target humidity can be approached without operating the cooling coil and the heater, and the target temperature and humidity can be reached by further performing a small amount of heating.

[0017] The invention described in Means 10 is based on Means 6, and the control device controls the air volume of the compression fan that compresses and sends the dehumidified air from the heat storage dehumidification tank so that the dehumidified air from the heat storage dehumidification tank has a set absolute humidity of the air on a psychrometric chart when the enthalpy of the outside air is low and the absolute humidity is relatively high compared to the target temperature and humidity, and also controls the air volume of the heat removal fan until the amount of heat removed from the heat removal air reaches the target temperature. Therefore, according to the invention described in Means 10, even when the enthalpy of the outside air is low and the absolute humidity is relatively high compared to the target temperature and humidity, the target temperature and humidity can be reached without operating the cooling coil and reheater.

[0018] The invention described in Means 11 is based on Means 8, and is characterized in that, when the enthalpy of the outside air is low and the absolute humidity is relatively low with respect to the target temperature and humidity, the control device controls the heating outside air obtained by utilizing the factory waste heat to be mixed with the outside air and introduced from the outside air inlet so as to achieve the target temperature and humidity while minimizing the use of the reheater of the paint booth air conditioner. Thus, according to the invention described in Means 11, a mixture of the heating outside air and the outside air is obtained by introducing the heating outside air obtained by effectively utilizing the thermal energy contained in the factory waste heat from the outside air inlet. This reduces the dependency on heating by the reheater and reduces the burden on the reheater, thereby reducing the energy required for air conditioning even in the intermediate season and winter.

[0019] The invention described in Means 12 is based on Means 4, and the dehumidified air generating device includes a heat exchanger that obtains heated outdoor air by exchanging heat between a fluid containing factory waste heat and outdoor air, and the control device controls the heating outdoor air to be supplied to at least one of the heat storage dehumidifier tanks before the operation start time based on information on the operation start time of the paint booth air conditioner, thereby recovering the dehumidification capacity in advance. Therefore, according to the invention described in Means 12, by effectively utilizing the thermal energy contained in the factory waste heat, at least one heat storage dehumidifier tank can be kept in a usable state when the paint booth air conditioner starts operating. Therefore, it is possible to immediately supply a predetermined conditioned air to the paint booth while reducing the energy required for air conditioning.

[0020] The invention described in Means 13 is the same as Means 4, in which the dehumidified air generating device includes a heat exchanger that obtains heated outdoor air by exchanging heat between a fluid containing factory waste heat and outdoor air, and the control device controls the control device to supply the heated outdoor air to the other unused heat storage dehumidification tanks to recover the dehumidification capacity of the other heat storage dehumidification tanks when the dehumidified air is supplied to the outdoor air inlet of the paint booth air conditioner using one of the multiple heat storage dehumidification tanks. Therefore, according to the invention described in Means 13, the other unused heat storage dehumidification tanks are restored to a usable state by effectively utilizing the thermal energy contained in the factory waste heat while a specific heat storage dehumidification tank is in use. Therefore, even if the dehumidification capacity of the specific heat storage dehumidification tank that was in use is reduced, it is possible to immediately switch to the other heat storage dehumidification tank that is in a usable state. Therefore, it is possible to continuously supply heated outdoor air while reducing the energy required for air conditioning. Effect of the Invention

[0021] As described above in detail, according to the invention as set forth in claims 1 to 13, it is possible to provide an air conditioning system for a paint booth that can reduce the energy required for air conditioning in summer. [Brief description of the drawings]

[0022] [Figure 1] 1 is a block diagram of an air conditioning system for a paint booth according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a psychrometric chart for explaining operation of the above system in summer. [Diagram 3] 6 is a flowchart for explaining the operation of the above system in summer. [Figure 4] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Diagram 5] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Figure 6] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Figure 7] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Figure 8] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Figure 9] FIG. 4 is a block diagram for explaining operation of the above system in summer. [Figure 10] FIG. 4 is an enlarged partial view of a psychrometric chart for explaining operation of the above system in summer. [Figure 11] FIG. 4 is a psychrometric chart for explaining operation of the above system during intermediate periods. [Figure 12] FIG. 4 is a psychrometric chart for explaining operation of the above system in winter. [Figure 13] This is a block diagram for explaining the operation of the above system during autumn and winter. [Figure 14] FIG. 5 is a block diagram of an air conditioning system for a paint booth according to a second embodiment. [Figure 15] FIG. 4 is a block diagram of an air conditioning system for a paint booth according to another embodiment. [Figure 16] FIG. 4 is a block diagram of an air conditioning system for a paint booth according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] [First embodiment] A paint booth air conditioning system 11 according to a first embodiment of the present invention will now be described in detail with reference to FIGS.

[0024] The paint booth air conditioning system 11 of this embodiment shown in FIG. 1 includes a paint booth air conditioner 21, a dehumidified air generating device 31, and a control device 15.

[0025] As shown in Fig. 1, the paint booth 1 to which the conditioned air generated by the paint booth air conditioning system 11 is supplied is generally installed in an area of ​​a paint workpiece conveying line for applying paint to the workpiece. The paint booth 1 includes a paint chamber, an air supply chamber provided above the paint chamber for supplying air with a downflow (a fixed direction from above to below) to the paint chamber, and an exhaust chamber provided below the paint chamber for exhausting the air in the paint chamber. In the paint booth 1 of this embodiment, the conditioned air discharged from the paint booth air conditioner 21 is supplied into the paint booth by a downflow from the air supply chamber. The air supply chamber of the paint booth 1 is provided with a booth temperature and humidity sensor S3 for measuring the temperature and humidity in the paint booth 1.

[0026] In the coating chamber of the coating booth 1, paint mist is sprayed from a coating machine (not shown) to coat the object. At this time, paint mist that is oversprayed from the coating machine and scattered is exhausted from the coating chamber to the exhaust chamber by the downflow of conditioned air acting on the coating chamber. In the exhaust chamber, the paint mist contained in the air is captured and the paint is recovered by using booth circulating water in the case of a wet type or a filter in the case of a dry type. The air exhausted from the exhaust chamber is released into the atmosphere by the exhaust fan 2.

[0027] As shown in FIG. 1, the paint booth air conditioner 21 in this embodiment is configured to include a plurality of types of air conditioning equipment. The paint booth air conditioner 21 is a device for adjusting the air (outside air) outside the device introduced from the outside air inlet 21a to a predetermined temperature (for example, about 23°C) and a predetermined humidity (for example, about 70% RH) and sending the air to the paint booth 1. The paint booth air conditioner 21 in this embodiment does not recirculate the air exhausted from the paint booth 1 to control the temperature and humidity, but takes in the outside air around the device to control the temperature and humidity, and is therefore sometimes called a fresh air conditioner. More specifically, the paint booth air conditioner 21 includes a preheater 22 as a preheating device, a washer 23 as a humidifying device, a cooling coil 24 as a cooling device, a direct steam 25 as a humidifying device, a reheater 26 as a reheating device, and an air supply fan 27.

[0028] The preheater 22 is a type of temperature control means for adjusting the temperature of the taken-in air, and is a device for heating the air to preliminarily raise the temperature. The washer 23 is a type of humidity control means for adjusting the humidity of the taken-in air, and is a device for increasing the humidity and lowering the temperature of the air by injecting water into the air that has passed through the preheater 22. The washer 23 has a washer pump (not shown) for circulating water. The cooling coil 24 is a type of adjustment means for adjusting the temperature and absolute humidity of the taken-in air, and is a cooling device for cooling the air that has passed through the washer 23 to lower the temperature. The direct steam 25 is a type of humidity control means for adjusting the humidity of the taken-in air, and is a device for increasing the humidity of the air by injecting water vapor into the air that has passed through the cooling coil 24. The reheater 26 is a type of temperature control means for adjusting the temperature of the taken-in air, and is a reheating device for reheating the air that has passed through the direct steam 25 to raise the temperature. The supply air fan 27 is an air compression device for compressing and sending temperature- and humidity-controlled air (i.e., conditioned air) to the paint booth 1. That is, in the paint booth air conditioner 21 of this embodiment, the temperature and humidity of air taken in from the outside are adjusted by the preheater 22, the washer 23, the cooling coil 24, the direct steam 25, and the reheater 26, and the conditioned air is supplied to the paint booth 1 by the supply air fan 27. An outside air temperature and humidity sensor S2 for measuring the temperature and humidity of the air taken in from outside the device is installed at the outside air inlet 21a of the paint booth air conditioner 21.

[0029] 1, the dehumidified air generating device 31 is a device for supplying dehumidified air to the outside air inlet 21a of the paint booth air conditioner 21. The dehumidified air generating device 31 of this embodiment includes two heat storage type dehumidification tanks 32A and 32B, a heat exchange means 36, a heat exchanger 39, a plurality of supply paths 41-48, and first to eleventh dampers MD1-MD11 which are a path switching mechanism. The first to eleventh dampers MD1-MD11 which are a path switching mechanism are mechanisms for switching the plurality of supply paths 41-48, and in this embodiment, conventionally known motor dampers are used.

[0030] The dehumidified air generating device 31 has a first supply path 41, a second supply path 42, a third supply path 43, a fourth supply path 44, a fifth supply path 45, a sixth supply path 46, a seventh supply path 47, and an eighth supply path 48. The first supply path 41 is a path for supplying the outside air taken in from one end side to the two heat storage type dehumidification tanks 32A and 32B connected to the other end side. More specifically, the other end side of the first supply path 41 branches into two branch paths 41a and 41b, and each of the branch paths 41a and 41b is connected to the heat storage inlet side of the two heat storage type dehumidification tanks 32A and 32B, respectively. At the most upstream position of the first supply path 41, a fourth temperature and humidity sensor S4, which is an outside air temperature and humidity sensor for measuring the temperature and humidity of the outside air taken in to the first supply path 41, is provided. A first damper MD1 for opening and closing the first supply path 41 is provided downstream of the fourth temperature and humidity sensor S4. A third damper MD3, which is a heat storage inlet damper of the first heat storage dehumidification tank 32A, is provided on the branch path 41a. A fourth damper MD4, which is a heat storage inlet damper of the second heat storage dehumidification tank 32B, is provided on the branch path 41b. A fifth temperature and humidity sensor S5 is provided immediately before the first heat storage dehumidification tank 32A on the branch path 41a. The fifth temperature and humidity sensor S5 is a sensor (heat dissipation outlet temperature and humidity sensor) that measures the temperature and humidity of the gas sent out through the branch path 41a. A sixth temperature and humidity sensor S6 is provided immediately before the second heat storage dehumidification tank 32B on the branch path 41b. The sixth temperature and humidity sensor S6 is a sensor (heat dissipation outlet temperature and humidity sensor) that measures the temperature and humidity of the gas sent out through the branch path 41b.

[0031] The second supply path 42 is a path connecting the two heat storage type dehumidifier tanks 32A, 32B and the outside air inlet 21a of the paint booth air conditioner 21, and is a path for mainly supplying the dehumidifier to the outside air inlet 21a. One end of the second supply path 42 branches into two branch paths 42a, 42b, and each of the branch paths 42a, 42b merges with two branch paths 41a, 41b connected to the two heat storage type dehumidifier tanks 32A, 32B. A fifth damper MD5, which is a heat release outlet proportional damper for adjusting the amount of dry outside air sent from the first heat storage type dehumidifier tank 32A, is provided on the branch path 42a. A sixth damper MD6, which is a heat release outlet proportional damper for adjusting the amount of dry outside air sent from the second heat storage type dehumidifier tank 32B, is provided on the branch path 42b. A first temperature and humidity sensor S1, which is a supply temperature and humidity sensor, is provided at the most downstream position of the second supply path 42, that is, at a position immediately before the dehumidified air is supplied to the outside air inlet 21a.

[0032] The fifth supply path 45 is a path for supplying the outside air taken in from one end to the two heat storage dehumidification tanks 32A and 32B connected to the other end via a route different from the first supply path 41. More specifically, the other end of the fifth supply path 45 branches into two branch paths 45a and 45b, and each of the branch paths 45a and 45b is connected to the heat dissipation inlet side of the two heat storage dehumidification tanks 32A and 32B. A seventh temperature sensor S7 is provided in the branch path 45a at a position immediately before the first heat storage dehumidification tank 32A. The seventh temperature sensor S7 is a heat storage outlet side temperature sensor for measuring the temperature of the gas flowing through the branch path 45a. An eighth temperature sensor S8 is provided in the branch path 45b at a position immediately before the second heat storage dehumidification tank 32B. The eighth temperature sensor S8 is a heat storage outlet side temperature sensor for measuring the temperature of the gas flowing through the branch path 45b. The branch path 45a is a path for taking in outside air to the first heat storage type dehumidifier tank 32A, and a seventh damper MD7, which is a heat radiation inlet damper for opening and closing the flow path, is provided on the way. The branch path 45b is a path for taking in outside air to the second heat storage type dehumidifier tank 32B, and an eighth damper MD8, which is a heat radiation inlet damper for opening and closing the flow path, is provided on the way. In addition, a dehumidifying air supply fan F2 is provided on the fifth supply path 45. This dehumidifying air supply fan F2 is for taking in outside air to the two heat storage type dehumidifier tanks 32A and 32B, and for pressure-feeding the dehumidified air generated in the heat storage type dehumidifier tanks 32A and 32B to the outside air inlet 21a of the paint booth air conditioner 21.

[0033] The third supply path 43 is a path that merges with the branch path 45a to connect to the heat storage outlet side of the heat storage dehumidification tank 32A, and is a path for discharging the gas in the heat storage dehumidification tank 32A. A ninth damper MD9, which is a heat storage exhaust damper for opening and closing the path, is provided on the third supply path 43. The fourth supply path 44 is a path that merges with the branch path 45b to connect to the heat storage outlet side of the heat storage dehumidification tank 32B, and is a path for discharging the gas in the heat storage dehumidification tank 32B. A tenth damper MD10, which is a heat storage exhaust damper for opening and closing the path, is provided on the fourth supply path 44.

[0034] The two heat storage type dehumidification tanks 32A and 32B are devices for taking in and dehumidifying outside air, and each tank contains a dehumidification unit 33. The dehumidification unit 33 is a structure in which an adsorbent that adsorbs moisture in the air is contained in a breathable container such as punched metal, but is not limited to this. Various conventionally known adsorbents can be used, but in this embodiment, a desiccant (desiccant agent) made of, for example, lithium chloride, silica gel, zeolite, etc. is used. This type of desiccant can be heated after absorbing moisture to return it to its pre-moisture state (i.e., release moisture).

[0035] A heat exchanger 39 is provided on the first supply path 41 to obtain heated outdoor air by exchanging heat between a fluid containing factory waste heat and outdoor air. In this embodiment, an air-liquid heat exchanger is used as the heat exchanger 39 that exchanges heat between a liquid (hot water) containing factory waste heat and outdoor air, but the present invention is not limited to this. An eleventh temperature sensor S11, which is a hot water supply temperature sensor, is provided on the path for taking in hot water containing factory waste heat. A tenth temperature sensor S10, which is a hot water return temperature sensor, and a hot water temperature control valve 47 are provided on the path for returning hot water containing factory waste heat.

[0036] A heat storage fan F1 is provided downstream of the heat exchanger 39 in the first supply path 41. The heat storage fan F1 is a fan for storing heat in the heat storage dehumidification tanks 32A and 32B by sending the heated outside air obtained by the heat exchanger 39 to the two heat storage dehumidification tanks 32A and 32B. A seventh supply path 47 for bypassing the heat exchanger 39 and taking in outside air is connected to the upstream side of the heat storage fan F1 and downstream side of the heat exchanger 39. A second damper MD2 for opening and closing the seventh supply path 47 is provided on the seventh supply path 47. A ninth temperature sensor S9, which is a heat storage temperature sensor for measuring the temperature of the outside air that has stored heat in the heat exchanger 39, is provided downstream of the heat storage fan F1.

[0037] The eighth supply path 48 is a path that bypasses the two heat storage dehumidification tanks 32A, 32B and connects the first supply path 41 and the second supply path 42. One end of the eighth supply path 48 is connected to a position downstream of the ninth temperature sensor S9 in the first supply path 41, and the other end is connected to the branch point of the branch paths 42a, 42b in the second supply path 42. An eleventh damper MD11, which is a heated air supply damper, is provided on the eighth supply path 48.

[0038] A heat exchange means 36 is provided on the second supply path 42, which removes heat from the dehumidified air discharged from the heat storage dehumidification tanks 32A and 32B by using outside air and then supplies the dehumidified air to the outside air inlet 21a. The heat exchange means 36 includes an air-air heat exchanger 37 that removes heat from the dehumidified air by exchanging heat between the outside air and the dehumidified air, and a heat removal fan F3 that sends outside air to the air-air heat exchanger 37. The air-air heat exchanger 37 and the heat removal fan F3 are connected via a sixth supply path 46, and the outside air is pressure-fed to the air-air heat exchanger 37 by the heat removal fan F3.

[0039] An air volume sensor 38 is provided downstream of the heat exchange means 36 on the second supply path 42 to measure the air volume when the dehumidified air generated in the heat storage dehumidification tanks 32A, 32B is pressurized and sent to the outside air inlet 21a of the paint booth air conditioner 21.

[0040] The control device 15 in this embodiment is a device for controlling the operation of the air conditioning equipment in the paint booth air conditioner 21 and the operation of various equipment (such as the dampers MD1 to MD11 and the fans F1 to F3) in the dehumidified air generating device 31 to control the conditioned air to approach the set temperature and humidity. The control device 15 is composed of one or more well-known sequencers or computers consisting of a CPU, storage means (ROM, RAM), etc. This control device 15 includes an air supply target input unit, an air supply setting calculation unit, an equipment control unit, etc. The equipment control unit includes a PID controller that controls the operation amount of the air conditioning equipment and the operation amount of the above equipment in the dehumidified air generating device 31 by PID control. The storage means in the control device 15 stores an air conditioning equipment operation program and a dehumidified air generating program for controlling temperature and humidity, and the CPU in the control device 15 reads out the programs from the storage means and executes them sequentially. In addition to these programs, data on a psychrometric chart (psychrometric chart table) that represents air state values ​​in coordinates is stored in the storage means. By the way, enthalpy increases as you move towards the upper right and lower left of the psychrometric chart, and decreases as you move towards the lower left and upper right.

[0041] PID control (Proportional-Integral-Differential Control) is a type of feedback control, and refers to control in which the input value is controlled by three elements: the deviation between the output value and the target value, and the integral and differential thereof. The PID controller of this embodiment has, for example, the same number of PID loops as the number of controlled objects. The PID controller, the motor parts of the dampers MD1 to MD11, the fans F1 to F3, and the hot water temperature control valve 47 are electrically connected to each other via a driver circuit (not shown). The PID controller is also electrically connected to the sensors S1 to S11 and 38. Therefore, the PID controller outputs a drive control signal to each controlled object, and the operation amount of each air conditioning device is PID-controlled by this. As a result, the outside air temperature and humidity are adjusted to reach the target temperature and humidity. At that time, the temperature and humidity measurement results from the sensors S1 to S11 and the air volume measurement result from the air volume sensor 38 are input. Therefore, the PID controller can perform feedback control based on the measurement results.

[0042] The air supply target input unit is electrically connected to the equipment control unit via the air supply setting calculation unit. The air supply target input unit is used to input target values ​​for temperature and humidity of the conditioned air to be supplied to the painting booth, and is configured to include means such as a keyboard, a touch panel, etc. An output signal from the air supply target input unit is input to the air supply setting calculation unit.

[0043] The various devices in the dehumidified air generating device 31 of this embodiment are controlled as follows based on a dehumidified air generating program.

[0044] For example, in summer, when the enthalpy of the outside air is high relative to the target temperature and humidity, the control device 15 controls the dehumidified air generator 31 to perform dehumidification and heating using the dehumidified air from the heat storage dehumidification tanks 32A and 32B. At the same time, the control device 15 controls the washer 23 to perform cooling and humidification only by the washer 23 until the target humidity is reached.

[0045] In this case, the control device 15 judges the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B in use based on the measured value of the first temperature and humidity sensor S1 provided at a position immediately before supplying the dehumidified air to the outside air inlet 21a. Then, when the control device 15 judges that the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B in use has become equal to or lower than a predetermined value, it operates the path switching mechanism to switch the supply path. By this control, the dehumidified air is supplied from the other heat storage type dehumidification tank 32A, 32B to the outside air inlet 21a of the paint booth air conditioner 21. Also, based on the measured values ​​of the first temperature and humidity sensor S1 and the air volume sensor 38, the control device 15 calculates the mixing amount of dehumidified air so as to obtain an enthalpy that does not operate the cooling coil 24 and the reheater 26, and controls the air volume of the dehumidification air supply fan F2 so as to obtain the mixing amount. The control device 15 controls the air volume of the heat removal fan F3 to adjust the temperature of the dehumidified air mixed with the outside air taken in by the paint booth air conditioner 21 based on the measured value of the first temperature and humidity sensor S1 and the measured value of the second temperature and humidity sensor S2 provided at the outside air inlet 21a. When the control device 15 determines that the dehumidification capacity of the heat storage type dehumidification tanks 32A and 32B is equal to or lower than a predetermined value, the control device 15 controls the heat storage type dehumidification tanks 32A and 32B to supply heated outside air obtained by utilizing the factory waste heat to the heat storage type dehumidification tanks 32A and 32B to recover the dehumidification capacity. When the control device 15 is using one of the two heat storage type dehumidification tanks 32A and 32B to supply dehumidified air to the outside air inlet 21a, the control device 15 controls the other heat storage type dehumidification tanks 32A and 32B not in use to supply heated outside air to recover the dehumidification capacity of the other heat storage type dehumidification tanks 32A and 32B. When the enthalpy of the outside air is low and the absolute humidity is relatively high with respect to the target temperature and humidity, the controller 15 controls the airflow rate of the dehumidification air supply fan F2 that pressure-supplies the dehumidified air from the heat-storage dehumidification tanks 32A, 32B so that the dehumidified air from the heat-storage dehumidification tanks 32A, 32B reaches the set absolute humidity of the supply air on the psychrometric chart. At the same time, the controller 15 controls the airflow rate of the heat removal fan F3 until the amount of heat removal from the heat removal air reaches the target temperature.

[0046] Furthermore, under a predetermined condition (specifically, in the case of winter or intermediate seasons), the control device 15 performs control so that the heated outside air obtained by utilizing the factory waste heat is mixed with the outside air and introduced from the outside air inlet 21a. For example, in the case of winter, when the enthalpy of the outside air is low and the absolute humidity is relatively low with respect to the target temperature and humidity, the control device 15 performs control so that the heated outside air obtained by utilizing the factory waste heat is mixed with the outside air and introduced from the outside air inlet 21a so as to achieve the target temperature and humidity while minimizing the use of the reheater 26 of the paint booth air conditioner 21.

[0047] Next, the operation of the system 11 of this embodiment will be described.

[0048] The psychrometric chart in Fig. 2 shows the state when operating in summer operation mode. In Fig. 2, a set temperature and humidity point P2 is plotted at a position corresponding to the set temperature and humidity (see △ in the diagram), and an outdoor temperature and humidity point P1 is plotted at a position corresponding to the outdoor air temperature and humidity at that time (see O in the diagram). Fig. 2 shows an example when the enthalpy of the outdoor air is higher than the set enthalpy. The isoenthalpy line showing the enthalpy of the air at the set temperature and humidity is given the symbol E1, and the isoenthalpy line to which the outdoor temperature and humidity point P1 belongs is given the symbol E2.

[0049] The thin arrows r1 to r4 in Fig. 2 indicate the movement path of the state point by temperature and humidity control, which is commonly performed. According to this, first, a part is cooled and humidified by the washer 23 (see arrow r1), and then the cooling coil 24 dehumidifies and cools, thereby moving the state point to the vicinity of the dew point P3 (reheat start point) of the set temperature and humidity (see arrow r2). After that, a part is heated by the reheater 26 (see arrow r3), and the rest is heated by the supply air fan 27, thereby reaching the set temperature and humidity point P2 (see arrow r4). The isoenthalpy line showing the enthalpy of the air at the heating start point by the supply air fan 27 is given the symbol E3.

[0050] In contrast, in this embodiment, dehumidified outside air generated by dehumidified air generator 31 is mixed with outside air and introduced from outside air inlet 21a, whereby dehumidification and heating are first performed (see arrow R1). When the state point reaches isoenthalpy line E3, the introduced outside air is then cooled and humidified by washer 23 and moved to the heating start point by supply air fan 27 (see arrow R2). Thereafter, the state point is heated by supply air fan 27 to reach set temperature and humidity point P2 (see arrow r4).

[0051] FIG. 3 is a flow chart for explaining a series of operations in the summer operation mode, and FIGS. 4 to 9 are block diagrams for explaining the series of operations at that time.

[0052] First, the control device 15 stores heat in the first heat storage dehumidification tank 32A and stops the second heat storage dehumidification tank 32B (step S110). In the flowchart of FIG. 3, the first heat storage dehumidification tank 32A is simply referred to as the "first tank" and the second heat storage dehumidification tank 32B is simply referred to as the "second tank". To explain this in detail with reference to FIG. 4, the control device 15 performs control to open the dampers MD1, MD3, and MD9 and keep the others closed. As a result, the first supply path 41, the branch path 41a, a part of the branch path 45a, and the third supply path 43 are opened (see the thick arrows in FIG. 4). At this time, the control device 15 drives the heat storage fan F1 to send the heated outside air obtained by the heat exchanger 39 to the first heat storage dehumidification tank 32A. When the heated outside air passes through the first heat-storage dehumidification tank 32A, heat is stored in the first heat-storage dehumidification tank 32A and the heat dries the adsorbent in the dehumidification unit 33. The heated outside air containing moisture is discharged to the outside of the device via the third supply path 43.

[0053] Next, the control device 15 proceeds to step S120, and while the second heat storage type dehumidification tank 32B is stopped, the first heat storage type dehumidification tank 32A is caused to perform heat dissipation. That is, the excess heat stored in the first heat storage type dehumidification tank 32A is caused to be discarded. To explain this in detail with reference to FIG. 5, the control device 15 performs control to open the dampers MD2, MD3, and MD9 and keep the others closed. As a result, the seventh supply path 47, a part of the first supply path 41, the branch path 41a, a part of the branch path 45a, and the third supply path 43 are opened (see the thick arrows in FIG. 5). At this time, the control device 15 drives the heat storage fan F1 to send outside air that has not passed through the heat exchanger 39 (i.e., outside air at room temperature) to the first heat storage type dehumidification tank 32A. This outside air passes through the first heat storage type dehumidification tank 32A and is released to the outside of the device through the third supply path 43, thereby discarding excess heat from the first heat storage type dehumidification tank 32A and lowering the temperature of the first heat storage type dehumidification tank 32A to approximately the outside air temperature.

[0054] Next, controller 15 proceeds to step S130, where it causes first heat-storage dehumidification tank 32A to dissipate heat and causes second heat-storage dehumidification tank 32B to store heat. Specifically, controller 15 performs control to open dampers MD1, MD4, and MD10, open dampers MD7 and MD5, and keep the others closed.

[0055] Then, the dampers MD1, MD4, and MD10 are opened, and the first supply path 41, the branch path 41b, a part of the branch path 45b, and the fourth supply path 44 are opened (see the thick arrows in FIG. 6). At this time, the control device 15 drives the heat storage fan F1 to send the heated outdoor air obtained by the heat exchanger 39 to the second heat storage type dehumidification tank 32B. When the heated outdoor air passes through the second heat storage type dehumidification tank 32B, heat is stored in the second heat storage type dehumidification tank 32B, and the adsorbent in the dehumidification unit 33 is dried by the heat. The heated outdoor air containing moisture is released to the outside of the device through the fourth supply path 44. In other words, while the first heat storage type dehumidification tank 32A is being used, the second heat storage type dehumidification tank 32B is prepared to be ready for use.

[0056] Furthermore, by opening the dampers MD7 and MD5, the fifth supply path 45, the branch path 45a, a part of the branch path 41a, the branch path 42a, and the second supply path 42 are opened (see the thick dashed arrow in FIG. 6). That is, an air pressure delivery path is formed from the first heat storage type dehumidification tank 32A to the outside air inlet 21a. At this time, the control device 15 sends the dehumidified air that has been dehumidified and delivered toward the outside air inlet 21a. More specifically, the control device 15 calculates the amount of dehumidified air to be mixed based on the measured values ​​of the first to third temperature and humidity sensors S1 to S3 and the air volume sensor 38 so as to obtain an enthalpy that does not operate the cooling coil 24 and the reheater 26, and PID controls the air volume of the dehumidified air delivery fan F2 so as to obtain the mixed amount. Based on the measured values ​​of the first temperature and humidity sensor S1 and the second temperature and humidity sensor S2, the control device 15 controls the air volume of the heat removal fan F3 to adjust the temperature of the dehumidified air mixed with the outside air taken in by the paint booth air conditioner 21. At the same time, the control device 15 drives the heat removal fan F3 of the heat exchange means 36 to remove heat from the dehumidified air discharged from the first heat storage type dehumidification tank 32A by using the outside air. Therefore, the dehumidified air supplied to the outside air inlet 21a becomes dehumidified air whose temperature has been lowered by removing heat (room temperature dehumidified air).

[0057] That is, in step S130, the dehumidified air generating device 31 is controlled to dehumidify and heat the outside air using the dehumidified air from the first heat storage type dehumidifying tank 32A, and as a result, the state point moves along the arrow R1 in FIG. 2. That is, dehumidification and heating are performed so that the state point passes over the isenthalpy line E1 and reaches the isenthalpy line E3. The control device 15 controls the washer 23 so that cooling and humidification are performed only by the washer 23 until the target humidity is reached, and as a result, the state point moves along the arrow R2 in FIG. 2 (i.e., along the isenthalpy line E3). After the state point reaches the heating start point by the supply air fan 27, the state point is made to reach the set temperature and humidity point P2 by heating the supply air fan 27 (see arrow r4).

[0058] Next, the control device 15 proceeds to step S135 and determines the dehumidification capacity of the first heat storage dehumidification tank 32A that is in use based on the measurement value of the temperature and humidity sensor S1 provided at a position immediately before the supply of dehumidified air to the outside air inlet 21a or the measurement value of the operation time of the first heat storage dehumidification tank 32A. If it is determined that the dehumidification capacity has not yet reached the predetermined value or less (step S135: NO), the control device 15 returns to step S130 and continues to cause the first heat storage dehumidification tank 32A to radiate heat and the second heat storage dehumidification tank 32B to store heat. If it is determined that the dehumidification capacity has reached the predetermined value or less (step S135: YES), the control device 15 proceeds to step S140.

[0059] In step S140, the first heat storage dehumidification tank 32A is caused to radiate heat, and the second heat storage dehumidification tank 32B is caused to perform waste heat radiation. Specifically, the control device 15 performs control to open the damper MD2 instead of closing the damper MD1. Then, the second supply path 42, a part of the first supply path 41, the branch path 41b, a part of the branch path 45b, and the fourth supply path 44 are opened (see the thick arrows in FIG. 7). At this time, the control device 15 drives the heat storage fan F1 to send the room temperature outside air to the second heat storage dehumidification tank 32B. When the room temperature outside air passes through the second heat storage dehumidification tank 32B, heat is taken from the second heat storage dehumidification tank 32B and released to the outside of the device, thereby performing waste heat radiation.

[0060] Next, the control device 15 proceeds to step S150 and issues an instruction to replace the dehumidification unit 33 (here, switching from the first heat storage type dehumidification tank 32A in use to the second heat storage type dehumidification tank 32B not in use). That is, the control device 15 operates the path switching mechanism to switch the supply path so as to store heat in the first heat storage type dehumidification tank 32A and dissipate heat from the second heat storage type dehumidification tank 32B. Specifically, the control device 15 performs control to open the dampers MD1, MD3, and MD9, as well as open the dampers MD8 and MD6, and keep the others closed.

[0061] Then, the dampers MD1, MD3, and MD9 are opened, and the first supply path 41, the branch path 41a, a part of the branch path 45a, and the third supply path 43 are opened (see the thick arrows in FIG. 8). At this time, the control device 15 drives the heat storage fan F1 to send the heated outdoor air obtained by the heat exchanger 39 to the first heat storage type dehumidification tank 32A. When the heated outdoor air passes through the first heat storage type dehumidification tank 32A, heat is stored in the first heat storage type dehumidification tank 32A, and the adsorbent in the dehumidification unit 33 is dried by the heat. The heated outdoor air containing moisture is released to the outside of the device through the third supply path 43. In other words, the control device 15 restores the dehumidification capacity of the first heat storage type dehumidification tank 32A, whose dehumidification capacity has become equal to or lower than a predetermined value, by supplying the heated outdoor air obtained by using factory waste heat to the first heat storage type dehumidification tank 32A.

[0062] Furthermore, the dampers MD8 and MD6 are opened, so that the fifth supply path 45, the branch path 45b, a part of the branch path 41b, the branch path 42b, and the second supply path 42 are opened (see the thick dashed arrow in FIG. 8). That is, an air pressure sending path is formed from the second heat storage type dehumidification tank 32B to the outside air inlet 21a. At this time, the control device 15 drives the heat removal air sending fan F2 to send out the dehumidified air dehumidified by the second heat storage type dehumidification tank 32B toward the outside air inlet 21a. More specifically, the control device 15 calculates the amount of dehumidified air to be mixed based on the measured values ​​of the first to third temperature and humidity sensors S1 to S3 and the air volume sensor 38 so as to obtain an enthalpy that does not operate the cooling coil 24 and the reheater 26, and performs PID control of the air volume of the heat removal air sending fan F2 so as to obtain the mixed amount. In addition, the control device 15 controls the air volume of the heat removal fan F3 to adjust the temperature of the dehumidified air to be mixed with the outside air taken in by the paint booth air conditioner 21 based on the measurement values ​​of the first temperature and humidity sensor S1 and the second temperature and humidity sensor S2.

[0063] Next, the control device 15 proceeds to step S155 and determines the dehumidification capacity of the second heat storage dehumidification tank 32B in use based on the measurement value of the temperature and humidity sensor S1 provided at a position immediately before the supply of dehumidified air to the outside air inlet 21a or the measurement value of the operating time of the second heat storage dehumidification tank 32B. If it is determined that the dehumidification capacity has not yet reached the predetermined value or less (step S155: NO), the control device 15 returns to step S150 and continues to cause the second heat storage dehumidification tank 32B to radiate heat and the first heat storage dehumidification tank 32A to store heat. If it is determined that the dehumidification capacity has reached the predetermined value or less (step S155: YES), the control device 15 proceeds to step S160.

[0064] In step S160, the second heat storage dehumidification tank 32B is caused to radiate heat, and the first heat storage dehumidification tank 32A is caused to perform waste heat radiation. Specifically, the control device 15 performs control to open the damper MD2 instead of closing the damper MD1. Then, the second supply path 42, a part of the first supply path 41, the branch path 41b, a part of the branch path 45a, and the third supply path 43 are opened (see the thick arrows in FIG. 8). At this time, the control device 15 drives the heat storage fan F1 to send the room temperature outside air to the first heat storage dehumidification tank 32A. When the room temperature outside air passes through the first heat storage dehumidification tank 32A, heat is taken from the first heat storage dehumidification tank 32A and released to the outside of the device, thereby performing waste heat radiation. Next, the control device 15 issues an instruction to replace the dehumidification unit 33 (here, switching from the second heat storage type dehumidification tank 32B in use to the first heat storage type dehumidification tank 32A that has been regenerated). That is, the control device 15 restores the dehumidification capacity of the second heat storage type dehumidification tank 32B, whose dehumidification capacity has fallen below a predetermined value, by supplying heated outside air obtained by utilizing factory waste heat to the second heat storage type dehumidification tank 32B. After returning to step S130 in this manner, the control device 15 repeats the operations of steps S135 to S160.

[0065] Incidentally, FIG. 10 is a partially enlarged view of a psychrometric chart for explaining the operation of the above-mentioned system 11 in summer, and shows an example in which the temperature of the outdoor air is slightly lower than the set temperature and the absolute humidity of the outdoor air is slightly higher than the set humidity. In this example, the enthalpy of the outdoor air is slightly lower than the enthalpy of the air at the target temperature and humidity. The thin arrows r1 to r4 in FIG. 10 indicate the movement path of the state point by the temperature and humidity control that is usually performed. In contrast, in this embodiment, the dehumidified outdoor air generated by the dehumidified air generating device 31 is mixed with the outdoor air and introduced from the outdoor air inlet 21a, so that first, dehumidification and heating are performed (see arrow R1). When the state point reaches a predetermined enthalpy value, the introduced outdoor air is then cooled and humidified by the washer 23 (see arrow R2). Next, the state point is heated by the reheater 26 to move to the heating start point by the air supply fan 27 (see arrow R2'). Thereafter, the state point is made to reach the set temperature and humidity point P2 by heating with the air supply fan 27 (see arrow r4). Even in this case, control can be basically performed according to the procedure shown in the flowchart of Fig. 3. Note that the control device 15 controls the air volume of the air supply fan 27, which pressurizes and sends the dehumidified air from the heat-storage dehumidification tanks 32A, 32B, so that the dehumidified air from the heat-storage dehumidification tanks 32A, 32B reaches the set absolute humidity of the air supply on the psychrometric chart. At the same time, the control device 15 controls the air volume of the heat removal fan F3 until the amount of heat removed from the heat removal air reaches the target temperature.

[0066] Next, the operation in the intermediate season operation mode will be described. Fig. 11 is a psychrometric chart for explaining the operation of the above-mentioned system 11 in intermediate seasons (i.e., spring and autumn), and shows an example when the temperature of the outside air is higher than the set temperature and the absolute humidity of the outside air is lower than the set humidity. Note that in this example, the enthalpy of the outside air is somewhat lower than the enthalpy of the air at the target temperature and humidity.

[0067] The thin arrows r5 to r8 in Fig. 11 indicate the movement path of the state point by temperature and humidity control, which is commonly performed. According to this, first, a part of the air is cooled and humidified by the washer 23 (see arrow r5), and then the air is humidified by the direct steam 25, thereby moving the state point to the set humidity (see arrow r6). After that, a part of the air is heated by the reheater 26 (see arrow r7), and the rest is heated by the air supply fan 27, thereby reaching the set temperature and humidity point P2 (see arrow r8).

[0068] In contrast, in this embodiment, the heated outside air obtained by the dehumidified air generator 31 is mixed with the outside air and introduced from the outside air inlet 21a, whereby heating is first performed (see arrow R3). When the state point reaches the isoenthalpy line E3, the introduced outside air is then cooled and humidified by the washer 23, and moved to the heating start point by the supply air fan 27 (see arrow R2). Thereafter, the state point is heated by the supply air fan 27, thereby reaching the set temperature and humidity point P2 (see arrow r8).

[0069] Next, the operation in the winter operation mode will be described. Fig. 12 is a psychrometric chart for explaining the operation of the above-mentioned system 11 in winter, and shows an example in which the temperature of the outside air is lower than the set temperature and the absolute humidity of the outside air is lower than the set humidity. In this example, the enthalpy of the outside air is significantly lower than the enthalpy of the air at the target temperature and humidity.

[0070] The thin arrows r9, R7 to R10 in Fig. 12 indicate the movement path of the state point by temperature and humidity control, which is commonly performed. According to this, the state point is first heated by the preheater 22 (see arrow r9), then partially cooled and humidified by the washer 23 to move along the isoenthalpy line E4 (see arrow R7), and further humidified by the direct steam 25 to move to the set humidity (see arrow R8). After that, the state point is partially heated by the reheater 26 (see arrow R9), and the rest is heated by the supply air fan 27 to reach the set temperature and humidity point P2 (see arrow R10).

[0071] In contrast, in this embodiment, the heated outside air obtained by the dehumidified air generator 31 is mixed with the outside air and introduced from the outside air inlet 21a, thereby first heating the air (see arrow R5). The amount of heating that is insufficient is heated by the preheater 22 (see arrow R6). Thereafter, following the normal procedure, the set temperature and humidity point P2 is reached using the washer 23, direct steam 25, preheater 26, and air supply fan 27 (see arrows R7 to R10).

[0072] FIG. 13 is a block diagram for explaining the operation in the intermediate season operation mode and the winter season operation mode. At this time, the control device 15 performs control to stop the first heat storage type dehumidification tank 32A and the second heat storage type dehumidification tank 32B, and to mix the heated outside air obtained by using the factory waste heat with the outside air and introduce it from the outside air inlet 21a. In this case, the control device 15 performs control to minimize the use of the reheater 26 of the paint booth air conditioner 21 so as to achieve the target temperature and humidity. To explain specifically with reference to FIG. 13, the control device 15 performs control to open the dampers MD1 and MD11 and keep the others closed. As a result, a part of the first supply path 41, the eighth supply path 48, and the second supply path 42 are opened (see the thick arrows in FIG. 13). In other words, the first supply path 41 and the second supply path 42 are connected via the eighth supply path 48, which is a bypass path. At this time, the control device 15 drives the heat storage fan F1 to send out the heated outside air obtained by the heat exchanger 39 to the outside air inlet 21a.

[0073] Therefore, according to this embodiment, the following effects can be obtained.

[0074] (1) The paint booth air conditioning system 11 of this embodiment includes a paint booth air conditioner 21, a dehumidified air generator 31, and a control device 15. The paint booth air conditioner 21 includes at least a washer 23 that adjusts the temperature and humidity of the outside air introduced from the outside air inlet 21a, and sends conditioned air to the paint booth 1. The dehumidified air generator 31 has heat storage type dehumidification tanks 32A and 32B that take in and dehumidify the outside air, and supplies the dehumidified air to the outside air inlet 21a of the paint booth air conditioner 21. The control device 15 controls the operation of the paint booth air conditioner 21 and the dehumidified air generator 31. Under a predetermined condition such as summer, the control device 15 mixes the dehumidified air with the outside air and introduces it from the outside air inlet 21a, and performs control to bring the introduced outside air closer to the target temperature and humidity by cooling and humidifying it with the washer 23.

[0075] According to this configuration, the dehumidified air generated by the heat storage type dehumidification tank 33 of the dehumidified air generating device 32A, 32B is mixed with outside air and introduced into the outside air inlet 21a, whereby the high temperature and high absolute humidity outside air is once dehumidified and heated. The dehumidified and heated outside air is then further cooled and humidified by the washer 23. This makes it possible to approach the target temperature and humidity mainly by the washer 23, without relying on dehumidification and cooling by the cooling coil 24 or heating by the reheater 26, etc. This reduces the burden on the cooling coil 24, the reheater 26, etc., and reduces the energy required for air conditioning in summer.

[0076] Furthermore, when the enthalpy of the outside air is high relative to the target temperature and humidity, the control device 15 controls the dehumidified air generator 31 to perform dehumidification and heating using the dehumidified air from the heat storage dehumidification tanks 32A and 32B. At the same time, the control device 15 controls the washer 23 to perform cooling and humidification only by the washer 23 until the target humidity is reached. Therefore, the target humidity can be approached without operating the cooling coil 24 and the reheater 26, and the target temperature and humidity can be reached by further slight heating (specifically, heating by the air supply fan 27).

[0077] (2) The dehumidified air generating device 31 in this system 11 is configured to include a heat exchange means 36 that removes heat from the dehumidified air discharged from the heat storage type dehumidification tanks 32A, 32B using outside air and then supplies it to the outside air inlet 21a. With this configuration, the dehumidified air from which heat has been removed is mixed with outside air and introduced, whereby the outside air with high temperature and high absolute humidity is dehumidified and heated. As a result, the amount of temperature rise of the outside air during the dehumidification and heating process is reduced, and the load on the washer 23 that performs cooling and humidification can be reduced.

[0078] (3) The heat storage type dehumidification tanks 32A, 32B in the system 11 include two heat storage type dehumidification tanks 32A, 32B, first to eighth supply paths 41-48 that supply dehumidified air from the heat storage type dehumidification tanks 32A, 32B to the outside air inlet 21a, and first to eleventh dampers MD1-MD11 that are a path switching mechanism that switches between the supply paths 41-48. The control device 15 determines the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B in use based on the measurement value of the first temperature and humidity sensor S1. When it is determined that the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B in use has become equal to or lower than a predetermined value, the control device 15 operates the path switching mechanism to switch the supply paths 41-48. This switching causes the dehumidified air to be supplied to the outside air inlet 21a from the other heat storage type dehumidification tanks 32A, 32B that are not in use. According to this configuration, when the dehumidification capacity of the heat storage type dehumidifying tank 32A, 32B in use decreases, dehumidified air is quickly supplied from the other heat storage type dehumidifying tank 32A, 32B. As a result, dehumidified air can be continuously generated by the dehumidified air generating device 31, and the dehumidified air can be continuously supplied to the outside air inlet 21a.

[0079] (4) The heat exchange means 36 in the system 11 includes an air-air heat exchanger 37 that removes heat from the dehumidified air by exchanging heat between the outside air and the dehumidified air, and a heat removal fan F3 that sends the outside air to the air-air heat exchanger 37. The control device 15 controls the air volume of the heat removal fan F3 based on the measured values ​​of the first temperature and humidity sensor S1 and the second temperature and humidity sensor S2 to adjust the temperature of the dehumidified air to be mixed with the outside air taken in by the paint booth air conditioner 21. With this configuration, the dehumidified air from which heat has been removed is adjusted to an appropriate temperature, so that the dehumidification and heating of the high temperature and high absolute humidity outside air can be performed accurately and stably.

[0080] (5) The dehumidified air generating device 31 in this system 11 has a dehumidified air supply fan F2 that takes in outside air into the heat storage type dehumidification tanks 32A and 32B and pressure-feeds the dehumidified air generated by them to the outside air inlet 21a. The control device 15 calculates the amount of dehumidified air to be mixed based on the measured values ​​of the first temperature and humidity sensor S1 and the air volume sensor 38 so that the enthalpy is such that the cooling coil 24 and the reheater 26 are not operated. The control device 15 controls the air volume of the dehumidified air supply fan F2 so that the mixed amount is obtained. With this configuration, when the dehumidified air is pressure-feed to the outside air inlet 21a, a mixed gas in which the dehumidified air and the outside air are mixed in an appropriate amount is obtained. Therefore, it is possible to approach the target temperature and humidity without almost operating the cooling coil 24 and the reheater 26.

[0081] (6) The dehumidified air generating device 31 in this system 11 includes a heat exchanger 39 that obtains heated outdoor air by exchanging heat between a fluid containing factory waste heat and outdoor air. When the control device 15 determines that the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B has fallen below a predetermined value, the control device 15 controls the supply of heated outdoor air obtained by using the factory waste heat to the heat storage type dehumidification tanks 32A, 32B to restore the dehumidification capacity. With this configuration, the thermal energy contained in the factory waste heat can be effectively used to restore the dehumidification capacity of the heat storage type dehumidification tanks 32A, 32B. Therefore, there is no need to input extra energy to restore the dehumidification capacity of the heat storage type dehumidification tank, and the energy required for air conditioning can be further reduced.

[0082] Moreover, when one of the two heat storage dehumidification tanks 32A, 32B is used to supply dehumidified air to the outside air inlet 21a, the control device 15 controls the other unused heat storage dehumidification tanks 32A, 32B to supply heated outside air, thereby recovering the dehumidification capacity of the other heat storage dehumidification tanks 32A, 32B. With this configuration, even if the dehumidification capacity of the specific heat storage dehumidification tank 32A, 32B that was in use decreases, it is possible to immediately switch to the other heat storage dehumidification tank 32A, 32B that is in a usable state. Therefore, it is possible to continuously supply heated outside air while reducing the energy required for air conditioning.

[0083] (7) In this system 11, the control device 15 performs control to mix heated outdoor air obtained by utilizing factory waste heat with outdoor air and introduce it from the outdoor air inlet 21a under a predetermined condition, specifically under a condition where the enthalpy of the outdoor air is low and the absolute humidity is relatively low with respect to the target temperature and humidity. With this configuration, a mixed gas of heated outdoor air and outdoor air can be obtained by effectively utilizing the thermal energy contained in the factory waste heat. Therefore, there is no need to input extra energy to generate heated outdoor air, and the energy required for air conditioning can be reduced even in the intermediate season and winter. In this case, the control device 15 performs control to mix heated outdoor air with outdoor air so as to achieve the target temperature and humidity by minimizing the use of the preheater 22 and the reheater 26. Therefore, the dependency on heating by the preheater 22 and the reheater 26 is reduced, and the burden on the preheater 22 and the reheater 26 can be reduced. Therefore, this also reduces the energy required for air conditioning in the intermediate season and winter. In other words, according to the above configuration, it is possible to reduce the energy required for air conditioning throughout the year, and it is possible to reliably reduce the costs required for air conditioning compared to the conventional case.

[0084] [Second embodiment] A paint booth air conditioning system 11A according to a second embodiment of the present invention will be described in detail below with reference to Fig. 14. Here, configurations different from those of the first embodiment will be described, while configurations common to the first embodiment will be denoted by the same component numbers and will not be described.

[0085] In the paint booth air conditioning system 11A of the embodiment, the configuration of the dehumidified air generator 31A is different from that of the dehumidified air generator 31 of the first embodiment. The dehumidified air generator 31A of the present embodiment does not use factory waste heat to restore the dehumidifying capacity of the heat storage type dehumidification tanks 32A and 32B, and therefore does not include the first supply path 41 and its associated equipment. Specifically, the first supply path 41, the branch paths 41a and 41b, the seventh supply path 47, the eighth supply path 48, the dampers MD1 to MD4, and MD11, the heat removal fan F1, the sensors S4, S9 to S11, and the heat exchanger 39 are omitted in this dehumidified air generator 31A.

[0086] Instead, the heat storage type dehumidification tanks 32A and 32B of the dehumidified air generating device 31A have a mechanism that allows the dehumidification unit 33 housed in the tank to be replaced. Any mechanism can be adopted as the dehumidification unit replacement mechanism without any particular limitation. For example, the heat storage type dehumidification tanks 32A and 32B may be provided with an openable and closable door, and the dehumidification unit 33 may be removed through the door. Also, an actuator may be installed in the heat storage type dehumidification tanks 32A and 32B, and the actuator may be driven and controlled by the control device 15 to automatically perform the above-mentioned opening and closing operation and removal operation. The dehumidification unit 33 removed from the heat storage type dehumidification tanks 32A and 32B is regenerated by performing a process to recover the dehumidification capacity in a regeneration facility installed separately from the system 11. In this case, the process may be performed by effectively utilizing the thermal energy contained in the factory waste heat.

[0087] In this embodiment, the control device 15 determines the dehumidification capacity of the heat storage dehumidification tanks 32A, 32B based on the measured value of the first temperature and humidity sensor S1 or the measured value of the operating time of the heat storage dehumidification tanks 32A, 32B. Then, when the control device 15 determines that the dehumidification capacity has fallen to a predetermined value or less, it instructs the replacement of the dehumidification unit 33.

[0088] For example, when the dehumidification capacity of the first heat storage dehumidification tank 32A falls below a predetermined value during use, an instruction is given to replace the dehumidification unit 33 of the first heat storage dehumidification tank 32A. In this case, the flow path is switched so that the first heat storage dehumidification tank 32A is stopped and the second heat storage dehumidification tank 32B is used. Then, while the second heat storage dehumidification tank 32B is in use, the dehumidification unit 33 is removed from the first heat storage dehumidification tank 32A and replaced with a dehumidification unit 33 that has been subjected to a dehumidification capacity recovery process. The removed dehumidification unit 33 is subjected to a dehumidification capacity recovery process in a regeneration facility.

[0089] Next, when the dehumidification capacity of the second heat storage dehumidification tank 32B falls below a predetermined value, an instruction is given to replace the dehumidification unit 33 of the second heat storage dehumidification tank 32B. In this case, the flow path is switched so that the second heat storage dehumidification tank 32B is stopped and the first heat storage dehumidification tank 32A is used. Then, while the first heat storage dehumidification tank 32A is being used, the dehumidification unit 33 is removed from the second heat storage dehumidification tank 32B and replaced with a dehumidification unit 33 that has been subjected to a dehumidification capacity recovery process. The removed dehumidification unit 33 is subjected to a dehumidification capacity recovery process in a regeneration facility.

[0090] The method for instructing to replace dehumidifying unit 33 is not particularly limited, and for example, characters or the like indicating the replacement instruction may be displayed on a display screen of a computer constituting control device 15. Alternatively, notification means (such as a warning light or a warning buzzer) may be provided for each of heat storage type dehumidifying tanks 32A, 32B, and the replacement instruction may be issued by activating the notification means.

[0091] Even in the configuration of the system 11A of the present embodiment described above, the dehumidified air generated by the heat storage type dehumidification tanks 32A and 32B of the dehumidified air generating device 31A is mixed with outside air and introduced into the outside air inlet 21a, whereby the outside air with high temperature and high absolute humidity is once dehumidified and heated. The dehumidified and heated outside air is then further cooled and humidified by the washer 23. This makes it possible to approach the target temperature and humidity mainly by the washer 23, without relying on dehumidification and cooling by the cooling coil 24 or heating by the reheater 26, etc. This reduces the burden on the cooling coil 24, the reheater 26, etc., and reduces the energy required for air conditioning in summer.

[0092] Furthermore, according to the configuration of this embodiment, the time to replace the dehumidifying unit 33 can be quickly known, making it easier to maintain the dehumidifying capacity of the heat-storage dehumidifying tanks 32A, 32B. Furthermore, since the dehumidified air generating device 31A of this embodiment is of the dehumidifying unit replacement type, it does not require the first supply path 41 and its associated equipment for storing heat (i.e., restoring the dehumidifying capacity) in the heat-storage dehumidifying tanks 32A, 32B. Therefore, the configuration is simpler than that of the dehumidified air generating device 31 of the first embodiment, and a small and inexpensive system 11A can be obtained.

[0093] Each embodiment of the present invention may be modified as follows.

[0094] In the first embodiment, the paint booth air conditioner 21 includes the preheater 22, the washer 23, the cooling coil 24, the direct steam 25, the reheater 26, and the air supply fan 27, but is not limited to this. In another embodiment, for example, the paint booth air conditioner 21 may include at least the washer 23 and the air supply fan 27, but may not include at least one of the preheater 22, the cooling coil 24, the direct steam 25, and the reheater 26.

[0095] Here, even if the preheater 22, cooling coil 24, direct steam 25 and reheater 26 are all omitted and the paint booth air conditioner 21 is equipped only with the washer 23 and the air supply fan 27, it is possible to control the outside air to approach the target temperature and humidity in summer, mid-season and winter.

[0096] For example, in summer, when the temperature of the outside air is higher than the set temperature and the absolute humidity of the outside air is higher than the set humidity, control is performed to reach the set temperature and humidity through dehumidification and heating by the dehumidified air generator 31, cooling and humidification by the washer 23, and heating by the air supply fan 27. Similarly, in summer, when the temperature of the outside air is slightly lower than the set temperature and the absolute humidity of the outside air is slightly higher than the set humidity, control is performed to reach the set temperature and humidity through dehumidification and heating by the dehumidified air generator 31, cooling and humidification by the washer 23, and heating by the air supply fan 27. In intermediate seasons, when the temperature of the outside air is higher than the set temperature and the absolute humidity of the outside air is lower than the set humidity, control is performed to reach the set temperature and humidity through heating by the dehumidified air generator 31, cooling and humidification by the washer 23, and heating by the air supply fan 27. Similarly, in winter when the temperature of the outside air is lower than the set temperature and the absolute humidity of the outside air is lower than the set humidity, control is performed to reach the set temperature and humidity through heating by the dehumidified air generating device 31, cooling and humidification by the washer 23, and heating by the air supply fan 27.

[0097] In another embodiment, for example, the control device 15 may be configured to perform control to supply heated outside air to one of the two heat storage type dehumidifying tanks 32A, 32B before the operation start time based on information on the operation start time of the paint booth air conditioner 21, thereby recovering the dehumidifying capacity in advance. The heated outside air is preferably obtained by heat exchange between a fluid containing factory waste heat and the outside air. With this configuration, one of the heat storage type dehumidifying tanks 32A, 32B can be made available when the paint booth air conditioner 21 starts operating by effectively utilizing the thermal energy contained in the factory waste heat. Therefore, a predetermined amount of conditioned air can be immediately supplied to the paint booth 1 while reducing the energy required for air conditioning.

[0098] In the first embodiment, the system is configured to include two heat storage type dehumidifying tanks 32A and 32B, and these two tanks are used alternately by switching the flow path, but this is not limited to this. For example, in another embodiment, the system may include three or more heat storage type dehumidifying tanks, and these three or more heat storage type dehumidifying tanks may be used in turn by switching the flow path.

[0099] In the paint booth air conditioning system 11A of the second embodiment described above, the dehumidified air generating device 31A has two heat storage type dehumidification tanks 32A and 32B, and the dehumidification units 33 housed in the tanks are alternately replaced for use, but this is not limited to this. For example, as in another embodiment shown in Fig. 15, the dehumidified air generating device 31A may have only one heat storage type dehumidification tank 32A.

[0100] In the paint booth air conditioning system 11 of the first embodiment, the dehumidified air generating device 31 includes two heat storage type dehumidification tanks 32A and 32B, and the dehumidification units 33 housed in the tanks are alternately used by performing the dehumidification capacity recovery process, but this is not limited to this. For example, as in another embodiment of the system shown in Fig. 16, the dehumidified air generating device 31 may include only one heat storage type dehumidification tank 32A.

[0101] 1: Paint booth 11, 11A: Air conditioning system for paint booth 15: Control device 21: Paint booth air conditioner 21a: Outside air intake 22: Preheater 23: Washer 24: Cooling coil 26: Lehita 27: Intake fan 31, 31A: Dehumidified air generator 32A, 32B: Heat storage type dehumidification tank 33: Dehumidification unit 36: Heat exchange means 37: Air heat exchanger 38: Air flow sensor 39: Heat exchanger 41~48: (1st~8th) Supply route F1: Heat storage fan F2: Dehumidifying air supply fan F3: Heat removal fan MD1 to MD11: 1st to 11th dampers as a path switching mechanism S1: First temperature and humidity sensor S2: Second temperature and humidity sensor

Claims

1. an air conditioner for a paint booth, the air conditioner including at least a washer for adjusting the temperature and humidity of the outside air introduced from the outside air inlet and for supplying the conditioned air to the paint booth; a dehumidified air generating device having a heat storage type dehumidification tank that takes in outside air and dehumidifies it, and supplying the dehumidified air to the outside air inlet of the paint booth air conditioner; a control device for controlling the operation of the paint booth air conditioner and the dehumidified air generating device; Equipped with The control device, under a predetermined condition, mixes the dehumidified air with outside air and introduces the mixture from the outside air inlet, and performs control to cool and humidify the introduced outside air by the washer to bring the temperature and humidity closer to a target temperature and humidity. An air conditioning system for a paint booth.

2. 2. The paint booth air conditioning system according to claim 1, wherein the dehumidified air generating device includes a heat exchange means for removing heat from the dehumidified air discharged from the heat storage dehumidification tank by using outside air and then supplying the dehumidified air to the outside air inlet.

3. The heat storage type dehumidification tank has a mechanism for making it possible to replace the dehumidification unit housed in the tank, The control device includes: determining a dehumidification capacity of the heat storage type dehumidification tank based on a measurement value of a temperature and humidity sensor provided immediately before the supply of the dehumidified air to the outside air inlet or a measurement value of an operating time of the heat storage type dehumidification tank; When it is determined that the dehumidifying capacity is equal to or lower than a predetermined value, an instruction is given to replace the dehumidifying unit.

3. The paint booth air conditioning system according to claim 2.

4. the dehumidified air generating device includes a plurality of the heat storage type dehumidification tanks, a plurality of supply paths that supply the dehumidified air from the plurality of the heat storage type dehumidification tanks to the outside air inlet, and a path switching mechanism that switches between the plurality of supply paths; The control device includes: determining a dehumidification capacity of the heat storage dehumidification tank during use based on a measurement value of a temperature and humidity sensor provided at a position immediately before the supply of the dehumidified air to the outside air inlet; When it is determined that the dehumidification capacity of the heat storage type dehumidification tank in use has fallen below a predetermined value, the route switching mechanism is operated to switch the supply route, thereby supplying the dehumidified air from another heat storage type dehumidification tank to the outside air inlet of the paint booth air conditioner.

3. The paint booth air conditioning system according to claim 2.

5. The heat exchange means of the dehumidified air generating device includes an air-air heat exchanger that removes heat from the dehumidified air by performing heat exchange between outside air and the dehumidified air, and a heat removal fan that sends outside air to the air-air heat exchanger, The control device includes: Based on the measured values ​​of a first temperature and humidity sensor provided at a position immediately before the dehumidified air is supplied to the outside air inlet and the measured values ​​of a second temperature and humidity sensor provided at the outside air inlet of the paint booth air conditioner, the air volume of the heat removal fan is controlled to adjust the temperature of the dehumidified air to be mixed with the outside air taken in by the paint booth air conditioner.

3. The paint booth air conditioning system according to claim 2.

6. The paint booth air conditioner includes a cooling coil for cooling outside air and a reheater for heating the outside air, the dehumidified air generating device has a dehumidified air supply fan that takes in outside air into the heat storage type dehumidification tank and pressure-supplies the dehumidified air generated in the heat storage type dehumidification tank to the outside air inlet of the paint booth air conditioner, The control device includes: Based on the measured values ​​of a first temperature and humidity sensor and an air flow sensor provided at a position immediately before the dehumidified air is supplied to the outside air inlet, a mixing amount of the dehumidified air is calculated so as to obtain an enthalpy that does not operate the cooling coil and the reheater, and the air flow rate of the dehumidified air supply fan is controlled so as to obtain the mixing amount.

6. The paint booth air conditioning system according to claim 1,

7. A heat exchanger is provided for exchanging heat between a fluid containing factory waste heat and outside air to obtain heated outside air, The control device includes: When it is determined that the dehumidification capacity of the heat storage type dehumidification tank has fallen below a predetermined value, the heated outside air obtained by utilizing the factory waste heat is supplied to the heat storage type dehumidification tank to perform control to recover the dehumidification capacity.

6. The paint booth air conditioning system according to claim 1,

8. A heat exchanger is provided for exchanging heat between a fluid containing factory waste heat and outside air to obtain heated outside air, The control device includes: Under predetermined conditions, the heated outside air obtained by utilizing the factory waste heat is mixed with outside air and is introduced through the outside air inlet.

6. The paint booth air conditioning system according to claim 1,

9. The control device includes: When the enthalpy of the outside air is high relative to the target temperature and humidity, Controlling the dehumidified air generating device so as to perform dehumidification and heating using the dehumidified air from the heat storage type dehumidification tank; The washer is controlled so that cooling and humidification are performed only by the washer until the target humidity is reached.

6. The paint booth air conditioning system according to claim 1,

10. The control device includes: When the enthalpy of the outside air is low and the absolute humidity is relatively high with respect to the target temperature and humidity, Controlling the air volume of the dehumidification air supply fan that pressure-supplies the dehumidified air from the heat storage type dehumidification tank so that the dehumidified air from the heat storage type dehumidification tank has a set absolute humidity of supply air on a psychrometric chart; The air volume of the heat removal fan is controlled until the heat removal temperature of the heat removal air reaches a target temperature.

7. The paint booth air conditioning system according to claim 6.

11. The control device includes: When the enthalpy of the outside air is low and the absolute humidity is relatively low with respect to the target temperature and humidity, In order to minimize the use of the reheater of the paint booth air conditioner and achieve the target temperature and humidity, the heated outside air obtained by utilizing the factory waste heat is mixed with the outside air and is introduced from the outside air inlet.

9. The paint booth air conditioning system according to claim 8.

12. The dehumidified air generating device includes a heat exchanger that performs heat exchange between a fluid containing factory waste heat and outside air to obtain heated outside air, The control device includes: Based on information on the operation start time of the paint booth air conditioner, the heated outside air is supplied to at least one of the plurality of heat storage type dehumidification tanks before the operation start time, thereby performing control to restore the dehumidification capacity in advance.

5. The paint booth air conditioning system according to claim 4.

13. The dehumidified air generating device includes a heat exchanger that performs heat exchange between a fluid containing factory waste heat and outside air to obtain heated outside air, The control device includes: When one of the plurality of heat storage type dehumidification tanks is used to supply the dehumidified air to the outside air inlet of the paint booth air conditioner, the heated outside air is supplied to the other heat storage type dehumidification tanks that are not in use, thereby performing control to recover the dehumidification capacity of the other heat storage type dehumidification tanks.

5. The paint booth air conditioning system according to claim 4.

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