JP6302372B2 - COATING SYSTEM AND OPERATION METHOD OF COATING SYSTEM - Google Patents

Description

  The present invention relates to a coating system for applying a water-soluble paint to an object to be coated and a method for operating the coating system.

  As described in Patent Document 1 (FIG. 2), a painting system for painting an automobile body or a part is supplied from an air supply chamber provided upstream (upper) of a painting booth to a painting chamber through a filter. While flowing the air-conditioned air, the paint misted by the coating machine is sprayed toward the object to be coated, and a uniform film thickness is adhered to the object to be coated. Air that contains oversprayed mist that does not adhere to the object to be painted during painting is separated and collected by the mist collection means provided on the downstream side (lower part) of the painting booth. Only fresh air is discharged to the outside. In this coating system, the outside air is adjusted to a predetermined temperature and humidity by an outside air conditioner provided on the upstream side of the painting booth.

  In addition, in the coating system shown in FIG. 1 of Patent Document 2, the dehumidification / reheating device uses a single heat pump that can be taken out at the same time in order to bring clean air discharged from the painting booth to a predetermined temperature and humidity. The air is cooled by the cold heat from the heat pump, and the air is heated by the hot heat from the heat pump so that the humidity of the air is set to a predetermined humidity.

JP 2010-274204 A Utility Model Registration No. 3168497

  In the coating system described in Patent Document 1, it is necessary to adjust the outside air to a predetermined temperature and humidity by an outside air conditioner provided on the upstream side of the painting chamber. For this reason, when the difference between the temperature and humidity of the outside air and the temperature and humidity to be adjusted is large, the input energy increases. In Japan, where there are four seasons, cold energy increases in summer and warm heat increases in winter, which may increase energy costs throughout the year. Moreover, in the coating system described in Patent Document 2, when the load on the hot water side is small, the load balance of the heat can be controlled. However, when the load on the cold water side is large, there is a risk that the heat will be insufficient. The load balance of cold heat cannot be controlled.

  In view of the above circumstances, at least one embodiment of the present invention provides a coating system and a coating system operating method capable of reducing energy costs throughout the year by reducing the input energy and the load balance between heat and cold according to the four seasons. The purpose is to provide.

A coating system according to at least one embodiment of the present invention includes:
A dehumidifying reheater that adjusts the temperature and humidity of the air to be adjusted while circulating the air to be adjusted in the painting booth that applies a water-soluble paint to the object to be coated;
Preheating for heating the adjustment target air while circulating the adjustment target air in the heating booth to heat and dry the object coated in the coating booth;
A precool for cooling the adjustment target air while circulating the adjustment target air in the cooling booth to cool the object heated in the heating booth,
The dehumidifying reheater includes hot water and cold water generated by a first heat pump capable of simultaneously extracting hot water and cold water, and cold water generated by a second heat pump capable of simultaneously extracting hot air and cold water. It is configured to adjust the temperature and humidity of the air to be adjusted,
The preheat is configured to heat the adjustment target air in the heating booth by the warm air generated by the second heat pump.
The pre-cooling is configured to cool the adjustment target air in the cooling booth by the cold heat of the cold water generated by the first heat pump and the second heat pump.

  According to the above coating system, the temperature and humidity of the air to be adjusted in the painting booth is adjusted so that hot water and cold water generated by the first heat pump capable of simultaneously taking out hot water and cold water, and hot air and cold water can be taken out simultaneously. 2 by cold water generated by heat pump. That is, the coating system of this application produces | generates warm water and cold water with the 1st heat pump and the 2nd heat pump. Since the heat pump can generate cold water, hot water or the like with less energy, the input energy of the entire coating system can be reduced. In addition, the dehumidifying reheater adjusts the temperature and humidity while circulating the air to be adjusted in the painting booth where the water-soluble paint is applied to the object to be coated, so the temperature of the air to be adjusted is compared with the temperature change of the outside air. Change can be reduced. For this reason, the input energy of the first heat pump or the second heat pump can be reduced. Therefore, a coating system with low input energy can be realized.

  In addition, by circulating the air to be adjusted, it is possible to reduce the input energy when the air to be adjusted is reheated and recooled even in the summer when a large amount of cold heat is required and in the winter when a large amount of heat is required. it can. For this reason, it is possible to level the energy of each of the necessary heat and cold throughout the year. Therefore, it is possible to realize a coating system capable of reducing energy costs throughout the year.

In some embodiments,
The dehumidifying reheater is connected to a cold water chiller capable of supplying cold water at a constant temperature to the dehumidifying reheater,
The cold water chiller is configured to operate when the cold heat supply by the first heat pump and the second heat pump is insufficient.

  In this case, since the cold water chiller operates when the cold heat supply by the first heat pump and the second heat pump is insufficient, the temperature adjustment set during the operation of the coating system can be performed. For this reason, an increase in input energy in the coating system can be suppressed. In addition, it is possible to prevent a possibility that the supply of cold heat is insufficient by the operation of the coating system.

In some embodiments,
A boiler capable of supplying heat to the preheat is connected to the preheat,
The boiler is configured to operate when the supply of hot air by the second heat pump is insufficient.

  In this case, a boiler capable of supplying warm heat to the preheat is connected to the preheat, and the boiler operates when the supply of hot air by the second heat pump is insufficient, so that the temperature adjustment set during the operation of the coating system can be performed. . For this reason, an increase in input energy in the coating system can be suppressed. In addition, it is possible to prevent a possibility that the supply of heat is insufficient due to the operation of the boiler.

In some embodiments,
The second heat pump is configured to be a heat pump using CO2 as a refrigerant.

  In this case, since the second heat pump is a heat pump using CO2 as a refrigerant, a higher COP can be obtained in a high temperature range as compared with a heat pump that employs an HFC refrigerant or the like. Therefore, the temperature of the heated warm air can be further increased.

In addition, the operation method of the coating system according to at least one embodiment of the present invention,
A method of operating a coating system for applying a water-soluble paint to an object to be coated,
A painting process of applying a water-soluble paint to the object to be coated in a painting booth;
A preheating step in which the object to be coated with the water-soluble paint in the painting step is heated in a heating booth and dried;
A pre-cooling step of cooling the object heated in the pre-heating step in a cooling booth,
In the painting step, the temperature of the adjustment target air circulating in the painting booth by the cold water generated by the first heat pump and the second heat pump capable of simultaneously taking out hot water and cold water and the hot water generated by the first heat pump. Adjust the humidity,
In the preheating step, the hot air generated by the second heat pump is mixed with the adjustment target air circulating in the heating booth and heated,
In the precooling step, the adjustment target air circulating in the cooling booth is cooled by the cold heat of the cold water generated by the first heat pump.

  According to the operation method of the coating system, in the painting process, the painting booth is constituted by the cold water generated by the first heat pump and the second heat pump capable of simultaneously taking out hot water and cold water, and the hot water generated by the first heat pump. The temperature and humidity of the adjustment target air circulating inside is adjusted. That is, in the operation method of the coating system of the present application, cold water or hot water is supplied by the first heat pump and the second heat pump. Since the heat pump can supply cold water or hot water with less energy, the input energy of the entire coating system can be reduced.

  In the painting process, the temperature and humidity of the adjustment target air circulating in the painting booth is adjusted. In the preheating process, the adjustment target air circulating in the heating booth is heated. In the precooling process, adjustment is performed to circulate in the cooling booth. Cool the target air. For this reason, the temperature change of adjustment object air can be made small compared with the temperature change of external air. For this reason, the input energy of a 1st heat pump or a 2nd heat pump can be decreased, and the operating method of the coating system with small input energy is realizable.

  In the painting process, preheating process, and precooling process, the air to be adjusted circulates in the corresponding booth. Therefore, the air to be adjusted is re-applied even in summer when large cold energy is required and in winter when large heat is required. Input energy when heating and recooling can be reduced. For this reason, it is possible to level the energy of each of the necessary heat and cold throughout the year. Therefore, the operation method of the coating system which can reduce the energy cost through the year is realizable.

In some embodiments,
In the painting step and the precooling step, when at least one of the cold supply to the adjustment target air circulating in the painting booth and the cold supply to the adjustment target air circulating in the cooling booth is insufficient, A cold water chiller capable of supplying cold water at a constant cooling temperature is operated to supply cold heat to the adjustment target air for which the cold heat supply is insufficient.

  In this case, in the painting process and the pre-cooling process, when at least one of the cold supply to the adjustment target air circulating in the painting booth and the cold supply to the adjustment target air circulating in the cooling booth is insufficient, the cold water chiller Since the cooling air is supplied to the air to be adjusted for which the cooling power supply is insufficient, the set temperature can be adjusted during the operation of the coating system. For this reason, it is possible to prevent the supply of cold heat from being insufficient during operation of the coating system, and it is possible to suppress an increase in input energy during operation of the coating system.

In some embodiments,
In the preheating step, when the supply of heat to the adjustment target air circulating in the heating booth is insufficient, a boiler capable of supplying the heat is operated to supply the adjustment target air for which the supply of heat is insufficient. It is configured as follows.

  In this case, in the preheating process, when the supply of heat to the adjustment target air circulating in the heating booth is insufficient, the boiler that can supply the heat is operated to supply the adjustment target air for which the supply of heat is insufficient. Therefore, the boiler can adjust the set temperature during operation of the painting system. For this reason, during the operation of the coating system, it is possible to prevent the possibility of insufficient supply of heat, and to suppress an increase in input energy.

  According to at least some embodiments of the present invention, it is possible to provide a painting system and a method for operating the painting system that can reduce the input energy and reduce the energy cost throughout the year.

It is a schematic block diagram of the coating system which concerns on one Embodiment of this invention. It is a schematic block diagram of the coating system used as a comparison object with the coating system which concerns on one Embodiment of this invention. It is the graph showing the calorie | heat amount load required in the summer and winter in the coating system made into the comparison object. In the coating system which concerns on one Embodiment of this invention, it is the graph showing the calorie | heat amount load required in summer and winter. It is the graph which compared the running cost of the coating system which concerns on one Embodiment of this invention, and the coating system made into the comparison object.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to FIGS. In this embodiment, a coating system that applies a water-soluble paint to an object to be coated will be described as an example. First, before describing the embodiment of the operation method of the coating system of the present invention, the embodiment of the coating system of the present invention will be described. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  FIG. 1 is a schematic configuration diagram of a coating system according to an embodiment of the present invention. As shown in FIG. 1, the painting system includes a painting booth 10, a heating booth 15, a cooling booth 20, a painting booth air conditioner 30 that air-conditions adjustment target air in the painting booth 10, and adjustment in the heating booth 15. A preheat air conditioner 50 that air-conditions the target air and a precool air conditioner 60 that air-conditions the adjustment target air in the cooling booth 20 are provided.

  In the painting booth 10, a water-soluble paint is sprayed in the form of a mist on an object to be coated such as an automobile body conveyed by a conveying device (not shown). A uniform and gentle air flow is flowing in the painting booth 10, and among the paints that are sprayed toward the object to be painted in the form of mist, the paint that has not adhered to the object to be painted is applied as a scattered mist. It is mixed with the air flow in the booth 10 and collected as scattered mist-containing air. The scattered mist-containing air is captured by the cleaning water flowing in the coating booth 10, and the cleaning water that has captured the paint mist is circulated and used after it has been purified by removing the captured paint by the separation device.

  On the other hand, a part (about 70%) of the adjustment target air in the painting booth 10 circulates between the painting booth air conditioner 30 and the dehumidifying reheater 31. Further, of the air to be adjusted, the amount corresponding to the amount introduced from the outside air (about 30%) is discharged to the outside.

  The heating booth 15 heats the object painted in the painting booth 10 to evaporate moisture adhering to the object to be dried. In the heating booth 15, air to be adjusted (about 80 ° C.) heated by the heater 51 of the preheat air conditioner 50 flows. A part (about 90%) of the adjustment target air circulates between the heating booth 15 and the heater 51, and a part (about 10%) corresponding to the amount introduced from the outside air out of the adjustment target air to the outside. Discharged.

  In the cooling booth 20, the object to be coated that has been heated in the heating booth 15 and brought into a dry state is cooled. In the cooling booth 20, the adjustment target air (about 15 ° C.) cooled by the cooler 61 of the precool air conditioner 60 flows. A part (about 90%) of the adjustment target air circulates between the cooling booth 20 and the cooler 61, and a part (about 10%) of the adjustment target air corresponding to the amount introduced from outside air is externally provided. Discharged.

  The painting booth air conditioner 30 includes a dehumidifying reheater 31, a cold water tank 33, a hot water tank 35, a first heat pump 37, a second heat pump 39, and a cold water chiller 41. The water stored in the cold water tank 33 is cooled by the first heat pump 37, the second heat pump 39 and the cold water chiller 41 and returned to the cold water tank 33. The water stored in the hot water tank 35 is heated by the first heat pump 37 and returned to the hot water tank 35.

  The first heat pump 37 is a vapor compression heat pump that circulates refrigerant in the order of compressor-condenser-expansion valve-evaporator, and the cold water cooled by the evaporator of the first heat pump 37 is converted into a first cold water tank circulation path 43. To the cold water tank 33. The hot water heated by the condenser of the first heat pump 37 is supplied to the hot water tank 35 through the hot water tank circulation path 44.

  Similar to the first heat pump 37, the second heat pump 39 is a vapor compression heat pump that circulates refrigerant in the order of compressor-condenser-expansion valve-evaporator, and the refrigerant is CO2. The cold water cooled by the evaporator of the second heat pump 39 is supplied to the cold water tank 33 through the second cold water tank circulation path 45. The warm air (about 120 ° C.) heated by the 39 condenser of the second heat pump is supplied to the heater 51 through the heater supply path 46.

  The cold water chiller 41 cools the water in the cold water tank 33 and returns it to the cold water tank 33 through the third cold water circulation path 47. The cold water chiller 41 operates when the supply of cold water to the cold water tank 33 by the first heat pump 37 and the second heat pump 39 is insufficient.

  The dehumidifying reheater 31 includes a cooling heat exchanger 31a that cools and dehumidifies the adjustment target air in the painting booth 10, and a reheating heat exchanger that heats the adjustment target air cooled and dehumidified by the cooling heat exchanger 31a. 31b. The cooling heat exchanger 31 a is connected between the cold water tank 33, the cooling heat exchanger 31 a, and the cooler 61, and the cold water sent from the cold water tank 33 is exchanged with the cooling heat exchange of the dehumidifying reheater 31. A cooling side circulation path 63 that is circulated between the cooler 31 a and the cold water tank 33 and is circulated between the cooling heat exchanger 61 a of the cooler 61 and the cold water tank 33 is connected. A pump 64 for sending the cold water in the cold water tank 33 is provided in the forward path of the cooling side circulation path 63.

  Next, the preheat air conditioner 50 will be described. The preheat air conditioner 50 includes a second heat pump 39 and a heater 51. The heater 51 has a heating heat exchanger 51 a that introduces warm air sent from the second heat pump 39 and heats the adjustment target air in the heating booth 15. The heat exchanger 51a for heating heats the adjustment target air by mixing the warm air introduced into the heating booth 15 and the adjustment target air. The heating heat exchanger 51a is connected to a heating circulation path 54 for passing steam heated by the boiler 53. The heater 51 normally heats the air to be adjusted with warm air sent from the second heat pump 39, and heats the air to be adjusted using steam supplied from the boiler 53 when the heat is insufficient.

In the second heat pump 39, an example in which warm air is sent to the heater 51 has been shown. However, adjustment in the heating booth 15 by a heat exchanger such as brine or oil, or a CO ₂ supercritical gas is performed. The target air may be heated. Further, the boiler 53 may be any of those using heavy oil as fuel, those using gas as fuel, and a burner boiler using gas as fuel.

  Next, the operation method of the coating system will be described. The operation method of the painting system is to apply a water-soluble paint to the object to be coated in the painting booth 10 and to heat the object to which the water-soluble paint is applied in the painting process in the heating booth 15. A preheating step of drying, and a precooling step of cooling the object heated in the preheating step in the cooling booth 20.

  In the painting process, the temperature and humidity of the adjustment target air circulating in the painting booth 10 are adjusted by the cold water generated by the first heat pump 37 and the second heat pump 39 and the hot water generated by the first heat pump 37. That is, the cold water stored in the cold water tank 33 is supplied to the cooling heat exchanger 31 a of the dehumidifying reheater 31 through the cooling side circulation path 63 and also supplied to the cooling heat exchanger 61 a of the cooler 61. Therefore, the adjustment target air (for example, temperature 22 ° C., humidity 95%) passing through the cooling heat exchanger 31a and cold water exchange heat, and the adjustment target air is cooled and dehumidified. When the temperature and humidity of the adjustment target air does not reach the desired temperature and humidity, the cold water chiller 41 is operated.

  Further, the adjustment target air passing through the reheat heat exchanger 31b exchanges heat with the hot water stored in the hot water tank 35 when passing through the reheat heat exchanger 31b, and the adjustment target air is heated. Therefore, the adjustment target air (for example, temperature 25 ° C., humidity 75%) whose temperature and humidity are adjusted is sent into the painting booth 10.

  In the preheating process, the warm air generated by the second heat pump 39 is supplied to the heater 51. The warm air supplied to the heater 51 is mixed with the adjustment target air circulating through the heating booth 15 to heat the adjustment target air (for example, about 80 ° C.). The heated air to be adjusted is sent into the heating booth 15 to heat and dry the object to be coated. Note that, when the temperature of the adjustment target air does not reach a desired temperature (for example, a temperature of 80 ° C.), the boiler 53 is operated.

  In the precooling process, the adjustment target air circulating in the cooling booth 20 is cooled by the cold heat of the cold water generated by the first heat pump 37. That is, the cold water stored in the cold water tank 33 is supplied to the cooling heat exchanger 61 a of the cooler 61 through the cooling side circulation path 63. Therefore, the adjustment target air (for example, temperature 20 ° C.) and the cold water (for example, temperature 7 ° C.) passing through the cooling heat exchanger 61a are heat-exchanged, and the adjustment target air is cooled (for example, temperature 15 ° C.). ).

  By the way, the coating system used as a comparison object with the coating system of embodiment of this application is shown in FIG. 2, the first heat pump 37, the second heat pump 39, and the hot water tank 35 are deleted from the coating system according to the embodiment of the present invention, and the steam delivered from the boiler 53 is dehumidified again. It is also supplied to the heat exchanger 31b for reheating of the heater 31, and in the painting booth 10, the air flowing through the booth is introduced from the outside air and exhausted to the outside air without being circulated. It is different from the coating system of this application. Since the other points are the same as those of the coating system of the embodiment of the present application, the description thereof will be given the corresponding reference numerals and the description thereof will be omitted.

  In the coating system to be compared, the adjustment target air in the coating booth 10 has the temperature and humidity of the adjustment target air circulating in the coating booth 10 by the cold water generated by the cold water chiller 41 and the steam generated by the boiler 53. Adjusted. That is, the cold water stored in the cold water tank 33 is supplied to the cooling heat exchanger 31 a of the dehumidifying reheater 31 through the cooling side circulation path 63. Therefore, the adjustment target air (for example, temperature 34 ° C., humidity 60%) passing through the cooling heat exchanger 31a and cold water exchange heat, and the adjustment target air is cooled and dehumidified.

  Further, the adjustment target air passing through the reheat heat exchanger 31b exchanges heat with the steam supplied from the boiler 53 when passing through the reheat heat exchanger 31b, and the adjustment target air is heated. Therefore, the air to be adjusted whose temperature and humidity are adjusted (for example, temperature 21 ° C., humidity 75%) is sent into the painting booth 10. The adjustment target air sent into the painting booth 10 is exhausted to the outside through the painting booth 10.

  In the preheating step, the heated steam generated by the boiler 53 is supplied to the heating heat exchanger 51 a of the heater 51. The steam supplied to the heater 51 is heat-exchanged with the adjustment target air circulating in the heating booth 15 to heat the adjustment target air (for example, about 80 ° C.). The heated air to be adjusted is sent into the heating booth 15 to heat and dry the object to be coated.

  In the precooling process, the adjustment target air circulating in the cooling booth 20 is cooled by the cold heat of the cold water generated by the cold water chiller 41. That is, the cold water stored in the cold water tank 33 is supplied to the cooling heat exchanger 61 a of the cooler 61 through the cooling side circulation path 63. Therefore, the adjustment target air (for example, temperature 20 ° C.) and the cold water (for example, temperature 7 ° C.) passing through the cooling heat exchanger 61a are heat-exchanged, and the adjustment target air is cooled (for example, temperature 15 ° C.). ).

  FIG. 3 shows a graph showing the heat load required in the summer and winter in this comparative coating system. As shown in FIGS. 2 and 3, it can be seen that the cold of the painting booth 10 increases in summer (in the drawings, 55% when the thermal load in the painting booth 10 in winter is 100%). Moreover, it turns out that the heat of the painting booth 10 is increasing in winter (100% in the drawing). This is probably because the painting booth 10 does not circulate the adjustment target air, but the adjustment target air whose temperature and humidity have been adjusted is sent to the painting booth 10 and then exhausted to the outside.

  On the other hand, in the coating system of the embodiment of the present application, as shown in FIGS. 1 and 4, the cooling load of the painting booth 10 in summer is small (in the drawing, the thermal load in the painting booth 10 in winter is 100%. 7%), it can be seen that the thermal load of the painting booth 10 in winter is small (8% in the drawing). Further, according to FIG. 5 showing a comparison of the running cost of the coating system of the present application and the comparison target coating system, the running cost of the coating system of the present application is low in both summer and winter, and the running system in the winter of the comparison coating system is low. If the cost is 100%, it can be reduced to about 1/2 (21% against 43%) in summer and about 1/4 (23% against 100%) in winter, and it is almost the same in summer and winter. It turns out that it is cost.

  Thus, according to the coating system of the present embodiment, as shown in FIG. 1, the temperature and humidity adjustment of the adjustment target air in the coating booth 10 is generated by the first heat pump 37 capable of simultaneously taking out the heat and cold. Hot water and cold water, and cold water generated by the second heat pump 39 capable of simultaneously taking out hot and cold water. The heat pump can generate cold water, hot water, etc. with less energy. For this reason, the input energy of the whole coating system can be made small. In addition, the dehumidifying reheater 31 adjusts the temperature and humidity while circulating the adjustment target air in the painting booth for applying the water-soluble paint to the object to be coated, so that the adjustment target air is compared with the temperature change of the outside air. Temperature change can be reduced. For this reason, the input energy of the 1st heat pump 37 and the 2nd heat pump 39 can be decreased. Therefore, a coating system with low input energy can be realized.

  In addition, by circulating the air to be adjusted, it is possible to reduce the input energy when the air to be adjusted is reheated and recooled even in the summer when a large amount of cold heat is required and in the winter when a large amount of heat is required. it can. For this reason, it is possible to level the energy of each of the necessary heat and cold throughout the year. Therefore, it is possible to realize a coating system capable of reducing energy costs throughout the year.

  In addition, since the second heat pump 39 is a heat pump that uses CO 2 as a refrigerant, it is possible to obtain a higher COP than a heat pump that employs an HFC refrigerant or the like. Therefore, the temperature of the heated warm air can be further increased.

DESCRIPTION OF SYMBOLS 10 Coating booth 15 Heating booth 20 Cooling booth 30 Coating booth air conditioner 31 Dehumidification reheater 31a Cooling heat exchanger 31b Reheating heat exchanger 33 Cold water tank 35 Hot water tank 37 1st heat pump 39 2nd heat pump 41 Cold water chiller 43 First cold water tank circulation path 44 Hot water tank circulation path 45 Second cold water tank circulation path 46 Heater supply path 47 Third cold water circulation path 50 Preheat air conditioner (preheat)
51 Heater 51a Heat exchanger for heating 53 Boiler 54 Circulation path for heating 60 Precool air conditioner (Precool)
61 Cooler 61a Heat exchanger for cooling 63 Cooling side circulation path 64 Pump

Claims (7)

A dehumidifying reheater that adjusts the temperature and humidity of the air to be adjusted while circulating the air to be adjusted in the painting booth that applies a water-soluble paint to the object to be coated
Preheating for heating the adjustment target air while circulating the adjustment target air in the heating booth to heat and dry the object coated in the coating booth;
A precool for cooling the adjustment target air while circulating the adjustment target air in the cooling booth to cool the object heated in the heating booth,
The dehumidifying reheater includes hot water and cold water generated by a first heat pump capable of simultaneously extracting hot water and cold water, and cold water generated by a second heat pump capable of simultaneously extracting hot air and cold water. It is configured to adjust the temperature and humidity of the air to be adjusted,
The preheat is configured to heat the adjustment target air in the heating booth by the warm air generated by the second heat pump.
The pre-cooling is configured to cool the adjustment target air in the cooling booth by cooling the cold water generated by the first heat pump and the second heat pump. The dehumidifying reheater is connected to a cold water chiller capable of supplying cold water at a constant temperature to the dehumidifying reheater,
The coating system according to claim 1, wherein the cold water chiller is configured to operate when the cold heat supply by the first heat pump and the second heat pump is insufficient. A boiler capable of supplying heat to the preheat is connected to the preheat,
The coating system according to claim 1 or 2, wherein the boiler is configured to operate when supply of hot air by the second heat pump is insufficient. The coating system according to claim 1, wherein the second heat pump is a heat pump using CO2 as a refrigerant. A method of operating a coating system for applying a water-soluble paint to an object to be coated,
A painting process of applying a water-soluble paint to the object to be coated in a painting booth;
A preheating step in which the object to be coated with the water-soluble paint in the painting step is heated in a heating booth and dried;
A pre-cooling step of cooling the object heated in the pre-heating step in a cooling booth,
In the painting step, the temperature of the adjustment target air circulating in the painting booth by the cold water generated by the first heat pump and the second heat pump capable of simultaneously taking out the heat and cold and the hot water generated by the first heat pump. Adjust the humidity,
In the preheating step, the hot air generated by the second heat pump is mixed with the adjustment target air circulating in the heating booth and heated,
In the precooling step, the adjustment target air circulating in the cooling booth is cooled by the cold heat of the cold water generated by the first heat pump. In the painting step and the precooling step, when at least one of the cold supply to the adjustment target air circulating in the painting booth and the cold supply to the adjustment target air circulating in the cooling booth is insufficient, The method of operating a coating system according to claim 5, wherein a cold water chiller capable of supplying cold water at a constant cooling temperature is operated to supply cold heat to the adjustment target air for which the cold heat supply is insufficient. In the preheating step, when the supply of heat to the adjustment target air circulating in the heating booth is insufficient, a boiler capable of supplying the heat is operated to supply the adjustment target air for which the supply of heat is insufficient. The operating method of the coating system according to claim 5.

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