JP5464841B2 - Paint booth exhaust recycling air conditioning system - Google Patents

Description

  The present invention includes a painting booth that performs painting by spraying paint on an object while flowing air in a certain direction, recovering a part of the air exhausted from the painting booth, and adjusting the temperature and humidity of the air. This is related to the exhaust recycling air conditioning system of the painting booth that is circulated again to the painting booth.

  The painting booth for painting automobile bodies and the like was painted by flowing air-conditioned air from the air supply chamber provided above the painting chamber through the filter to the painting chamber, and was oversprayed during painting. Contaminated air containing paint mist is exhausted from an exhaust chamber provided under the floor. With this configuration, problems such as deterioration of the working environment in the coating chamber and deterioration of the quality of the object to be coated due to fogging of the paint mist are solved.

  FIG. 4 shows a schematic configuration of a conventional paint booth air conditioning system 80. As shown in FIG. 4, the air conditioning system 80 includes a coating booth 81, an outside air conditioner 82, and a circulation air conditioner 83. The outside air conditioner 82 takes in air from the outside of the painting booth 81, adjusts the air to a predetermined temperature and a predetermined humidity, and then sends the air toward the painting booth 81 via the fan 84. The circulation air conditioner 83 collects a part of the air exhausted from the painting booth 81 through the fan 85, adjusts the air to a predetermined temperature and a predetermined humidity, and then returns to the painting booth 81 through the fan 86 again. To air. A part of the air exhausted from the painting booth 81 is released to the atmosphere via the fan 87.

Moreover, the above air conditioning systems which circulate a part of the air exhausted from the painting booth to the painting booth are also disclosed in Patent Documents 1 and 2 and the like.
JP-A-5-269414 JP 59-199076 A

  By the way, in the circulating air conditioner 83 used in the conventional air conditioning system 80, the temperature of the air is reduced using a cooler to remove moisture contained in the air, and then heated by a heater to warm the air. Control is performed so that the conditioned air has a preset temperature and humidity. In the circulation air conditioner 83, energy is required for cooling the air and heating the air. Conventionally, since the cooling energy and the heating energy are obtained by using the cooling heat source and the heat source, the running cost increases. In particular, the painting booth 81 for painting an automobile body is large in size and requires a large amount of conditioned air. For this reason, an air conditioning system that can keep running costs low is desired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an exhaust gas recycling air conditioning system for a painting booth that can reduce running costs.

In order to solve the above-mentioned problems, in the invention described in means 1, in the invention described in means 1, a painting booth for spraying paint on an object to be coated while flowing air-conditioned air in a certain direction, and air from outside the painting booth The outside air conditioner that adjusts the temperature and humidity of the air and sends it to the painting booth, and collects a part of the air exhausted from the painting booth and adjusts the temperature and humidity of the air and circulating the air conditioner to air again toward the painting booth and, a compression type heat separation means having a heat radiating portion for heating the heat absorbing portion and a heat medium for cooling the heat medium, said circulating air conditioner, the recovery Air cooling means for cooling and dehumidifying the air, and air heating means arranged on the downstream side of the air cooling means for heating the air dehumidified by the air cooling means, the air cooling means Compression heat separation means Main air cooling means for cooling air using the heat medium cooled by the heat absorption part, wherein the air heating means uses the heat medium heated by the heat radiation part of the compression heat separation means. look including the main air heating means for heating air, air cooling of the outside air conditioning unit is connected to the cold source by a first supply path for supplying the cooled heat medium, air heating portion of the outside air air conditioner Is connected to a heat source by a second supply path for supplying a heated heat medium, and the air cooling means can be supplied via a first flow rate adjusting valve provided on the first supply path. The apparatus further includes sub air cooling means for cooling the air using a part of the cooled heat medium, and the air heating means is supplied via a second flow rate adjusting valve provided on the second supply path. A portion of the heated heating medium is possible. And further comprising a sub air heating means for warming the air, and when the cold load is larger than the heat load of the circulating air conditioner, the same amount of heat energy and cold energy as the heat load is compressed. When the heat energy is generated by the heat separating means and the insufficient cooling energy is supplemented by the sub air cooling means, and the heat load of the circulating air conditioner is larger than the cooling load, the same amount of cooling energy as the cooling load is obtained. An exhaust gas recycle air-conditioning system for a painting booth, wherein control is performed so that energy is generated by the compression heat separation means and insufficient heat energy is compensated by using the auxiliary air heating means .

  Therefore, according to the invention described in the means 1, in the compression heat separation means, the heat absorption energy and the heat radiation energy are efficiently generated, and the heat medium is cooled in the heat absorption portion using each energy, and in the heat radiation portion. The heat medium is heated. In the circulating air conditioner, the air is cooled and dehumidified by the main air cooling means of the air cooling means using the heat medium cooled by the heat absorbing portion of the compression heat separating means. An air heating means is disposed downstream of the air cooling means, and the air is heated by the main air heating means of the air heating means using the heat medium heated by the heat radiating portion of the compression heat separating means. Warmed. As in the present invention, when recovering air exhausted from a painting booth in a circulating air conditioner and adjusting its temperature and humidity, the amount of deviation from the temperature and humidity to be adjusted as compared with the case of air conditioning the outside air Less energy is required. In this case, the heat absorption energy and the heat radiation energy required for adjusting the temperature and humidity are substantially equal. Therefore, if the energy required for the circulating air conditioner is obtained by the compression heat separation means as in the present invention, the energy can be used efficiently and the running cost of the air conditioning system can be kept low. .

In the invention described in the above means 1, the air cooling means further includes sub air cooling means for cooling the air using a heat medium cooled by an auxiliary cooling heat source . When the temperature is high and the air cannot be sufficiently cooled only by the endothermic energy of the endothermic part of the compression heat separation means, the sub-air cooling means reliably cools the air using the heat medium cooled by the auxiliary cooling heat source. be able to.

In the invention described in the above means 1, the air heating means further includes a sub air heating means for warming the air using a heat medium heated by an auxiliary heat source. When the air cannot be sufficiently warmed only by energy, the sub-air heating means can reliably warm the air using the heat medium heated by the auxiliary heat source.

The invention described in means 2 is the air cooling means in the above means 1 , wherein the main air cooling means is arranged upstream of the sub air cooling means, and in the air heating means, the main air heating means is The gist is that it is arranged upstream of the sub air heating means.

Therefore, according to the invention described in the above means 2 , since the main air cooling means is arranged upstream of the sub air cooling means, the air can be efficiently cooled by the main air cooling means. Further, since the main air heating means is disposed on the upstream side of the sub air heating means, the main air heating means can efficiently heat the air.

The invention described in means 3 is the air circulation channel configured to include the coating booth and the circulation air conditioner in the means 1 or 2 , and the outlet point of the circulation air conditioner or the outside air conditioner and the Based on the temperature sensor and humidity sensor arranged at a position after the confluence of air discharged from the circulation air conditioner, and the temperature and humidity information obtained by the temperature sensor and the humidity sensor, the temperature of the air and The gist of the invention is that the air cooling means and the circulating air conditioner control means for controlling the air heating means are provided so that the humidity becomes a preset temperature and humidity.

Therefore, according to the invention described in the above means 3 , the temperature and humidity information after the exit point of the circulation air conditioner or the confluence of the air discharged from the outside air conditioner and the circulation air conditioner is detected by the temperature sensor and the humidity sensor. Is obtained, and the air cooling unit and the air heating unit are controlled by the circulating air conditioner control unit based on the temperature and humidity information. In this way, the conditioned air supplied to the painting booth can be adjusted to the optimum temperature and humidity for painting.

According to the invention described in means 4 , in the means 3 , the circulating air conditioner control means controls the air cooling means to operate the main air cooling means in preference to the auxiliary air cooling means, and The gist of the invention is to control the air heating means so that the main air heating means is operated in preference to the air heating means.

Therefore, according to the invention described in the above means 4, when the main air cooling means is prioritized and operated by the circulating air conditioner control means, and the energy required for air cooling is insufficient, the sub air cooling means Insufficient energy is subsidized. Further, when the main air heating means is operated with priority by the circulation air conditioner control means, and the energy required for heating the air is insufficient, the insufficient energy is assisted by the sub air heating means. If it does in this way, the energy which generate | occur | produces with a compression-type heat separation means can be utilized without waste by the main air cooling means and the main air heating means, and the energy efficiency of an air conditioning system can be improved.

Before Symbol circulating air conditioner control means may control the air cooling means and said air heating means so that the heat radiation energy by the auxiliary air heating means than the endothermic energy is reduced by the auxiliary air cooling means.

Ideally, the heat absorption energy of the heat absorption part and the heat radiation energy of the heat radiation part are equal to each other, but the mechanical heat loss or the like occurs during actual operation, so that the heat radiation energy becomes large. Therefore, it is possible to prevent the air from being heated more than necessary by controlling the heat radiation energy by the sub air heating means to be smaller than the heat absorption energy by the sub air cooling means as described above .

As described in detail above, according to the first to fourth aspects of the present invention, the running cost of the exhaust gas recycling air conditioning system of the painting booth can be suppressed.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an exhaust gas recycling air conditioning system for a painting booth in the present embodiment.

  As shown in FIG. 1, an exhaust gas recycle air conditioning system 1 includes a painting booth 2, a fresh air conditioner 3 (outside air air conditioner), a recycle air conditioner 4 (circulation air conditioner), and a heat pump 5 (compression heat separation means). And a device 6 (circulation air conditioner control means).

  The painting booth 2 is provided on the upper side of the painting chamber 11 for painting an object to be coated (for example, automobile parts, etc.), and flows down to the painting chamber 11 (a certain direction from above to below). An air supply chamber 12 for supplying air and an exhaust chamber 13 provided at the lower side of the coating chamber 11 for exhausting the air in the coating chamber 11 are provided. In the painting booth 2 of the present embodiment, the air A1 discharged from the fresh air conditioner 3 and the air A2 discharged from the recycle air conditioner 4 are mixed in the air supply chamber 12 and then painted as downflow conditioned air. It is supplied to the chamber 11.

  Then, in the coating chamber 11, the object to be coated is applied by spraying a paint mist from a coating machine (not shown). At this time, the paint mist that has been oversprayed and scattered from the coating machine is discharged from the coating chamber 11 to the exhaust chamber 13 by the downflow conditioned air acting in the coating chamber 11. In the exhaust chamber 13, the paint mist contained in the air is captured using the booth circulating water, and the paint is collected. A part of the air A3 discharged from the exhaust chamber 13 is sent to the recycle air conditioner 4 by the blower fan 15, while the remaining air is released to the atmosphere by the blower fan 16.

  In the present embodiment, the recycle rate of the air A4 collected by the recycle air conditioner 4 is, for example, about 40% to 80%. Further, substantially the same amount of air A3 as air A0 taken into the fresh air conditioner 3 is released to the atmosphere through the blower fan 16.

  The fresh air conditioner 3 is an air conditioner that adjusts the external air A0 to a predetermined temperature (for example, 23 ° C.) and a predetermined humidity (for example, 70% RH), and includes a primary filter 21, a secondary filter 22, and a preheater 23. , A humidifier 24 (washer), a heating humidifier 25 (direct steam), a cooler 26, and a reheater 27. In the fresh air conditioner 3, steam S1 is supplied from the heat source 31 to the preheater 23, the heating humidifier 25, and the reheater 27, and cold water W1 is supplied from the cold heat source 32 to the cooler 26. In the fresh air conditioner 3, the air A 0 taken from the outside is purified by the primary filter 21 and the secondary filter 22, and then is preheated by the preheater 23, the humidifier 24, the heating humidifier 25, the cooler 26, and the reheater 27. Temperature and humidity are adjusted. In the fresh air conditioner 3, a temperature sensor 34 and a humidity sensor 35 are provided in the vicinity of the air A 0 intake port, and humidity sensors 36 and 37 are provided on the upstream side and the downstream side of the humidifier 24. Further, a flow rate adjusting valve (not shown) is provided in the middle of the supply flow path of the steam S1 connecting the fresh air conditioner 3 and the heat source 31 and the supply flow path of the cold water W1 connecting the fresh air conditioner 3 and the cold heat source 32. Is provided. Then, a control device (not shown) drives the flow rate adjustment valve based on the detection values of the sensors 34 to 37, whereby the supply amount of the steam S1 to the preheater 23, the heating humidifier 25, and the reheater 27 is controlled and cooled. The amount of cold water W1 supplied to the vessel 26 is controlled. As a result, the air A1 is adjusted so that the temperature and humidity are optimum for painting. Then, the air A1 adjusted to a predetermined temperature and a predetermined humidity is sent from the fresh air conditioner 3 to the air supply chamber 12 by the blower fan 39.

  The recycle air conditioner 4 is an air conditioner that adjusts the air A3 discharged from the exhaust chamber 13 to a predetermined temperature (for example, 23 ° C.) and a predetermined humidity (for example, 70% RH), and includes a first cooler coil 41 (main air cooling). Means), a second cooler coil 42 (sub air cooling means), a first reheater 43 (main air heating means), and a second reheater 44 (sub air heating means). The air A3 discharged from the exhaust chamber 13 has a temperature of about 22 ° C. and a humidity of about 85% RH. The first cooler coil 41 is supplied with cold water W2 from the heat pump 5, and the second cooler coil 42 is supplied with cold water W1 from the cold heat source 32 via the flow rate adjustment valve 45. The first reheater 43 is supplied with hot water W3 from the heat pump 5, and the second reheater 44 is supplied with steam S1 from the heat source 31 via the flow rate adjustment valve 46. The heat source 31 and the cold heat source 32 used here are a cold heat source and a heat source used in the fresh air conditioner 3.

  In the recycle air conditioner 4, the air A <b> 4 collected from the painting booth 2 is temperature-controlled and humidity-controlled by the first cooler coil 41, the second cooler coil 42, the first reheater 43, and the second reheater 44. Then, the temperature-controlled and humidity-controlled air A <b> 2 is sent from the recycle air conditioner 4 to the air supply chamber 12 by the blower fan 49.

  As shown in FIG. 2, the heat pump 5 has a refrigerant flow path 50 through which the refrigerant flows. The refrigerant flow path 50 is an annular closed flow path. On the refrigerant flow path 50, a condenser 51 (heat radiating part), an evaporator 52 (heat absorption part), a compressor 53, and an expansion valve 54 are installed. ing. The condenser 51 is a heat exchanger that exchanges heat between the refrigerant flow path 50 and the hot water flow path 56, and the heat of the refrigerant flowing through the refrigerant flow path 50 is transmitted to the water flowing through the hot water flow path 56 (heat radiation). It has come to be. The evaporator 52 is a heat exchanger that exchanges heat between the refrigerant flow path 50 and the cold water flow path 57, and the heat of water flowing through the cold water flow path 57 is transmitted to the refrigerant flowing through the refrigerant flow path 50 ( Endothermic).

  The compressor 53 is disposed on the upstream side of the condenser 51 (and on the downstream side of the evaporator 52), and compresses the refrigerant flowing in the refrigerant flow path 50 and sends it to the condenser 51. The expansion valve 54 is disposed on the downstream side of the condenser 51 (and on the upstream side of the evaporator 52), and switches the refrigerant flow path 50 between an open state and a closed state. The expansion valve 54 can supply the refrigerant to the evaporator 52 when switched to the open state.

  In the heat pump 5, heating of the water flowing in the hot water flow path 56 and cooling of the water flowing in the cold water flow path 57 are performed in the following order. First, the compressor 53 is driven with the expansion valve 54 switched to the closed state, and the refrigerant is sent to the condenser 51. At this time, since the refrigerant is blocked by the expansion valve 54, the refrigerant is compressed as the refrigerant is sent to the condenser 51, and the refrigerant in the vicinity of the condenser 51 becomes high temperature. As a result, in the condenser 51, the heat of the refrigerant in the refrigerant channel 50 is transmitted to the water in the hot water channel 56, and the water flowing in the hot water channel 56 becomes the hot water W3. The hot water W3 is supplied to the first reheater 43.

  Further, as the refrigerant in the condenser 51 is compressed, the refrigerant in the vicinity of the evaporator 52 is expanded to a low temperature. As a result, in the evaporator 52, the heat of the water in the cold water flow path 57 is transmitted to the refrigerant in the refrigerant flow path 50, and the water flowing in the cold water flow path 57 becomes the cold water W2. The cold water W2 is supplied to the first cooler coil 41.

  As shown in FIG. 1, in the recycle air conditioner 4 of the present embodiment, a temperature sensor 61 and a humidity sensor 62 are provided upstream of the first cooler coil 41 in the vicinity of the air inlet, and the first cooler coil 41 A temperature sensor 63 and a humidity sensor 64 are provided on the downstream side. Furthermore, a temperature sensor 65 and a humidity sensor 66 are also provided on the downstream side of the first reheater 43. Each sensor 61 to 66 is connected to the control device 6. Further, in the present embodiment, a temperature sensor 67 and a humidity sensor 68 are also provided in the supply chamber 12 of the painting booth 2 that becomes a confluence of the air A1 and A2 discharged from the air conditioners 3 and 4. These temperature sensor 67 and humidity sensor 68 are also connected to the control device 6.

  The control device 6 is configured by a known computer including a CPU 71, a ROM 72, a RAM 73, and the like, and controls the recycle air conditioner 4 based on the detection values of the sensors 61 to 68. Specifically, the control device 6 calculates the amount of heat necessary for air conditioning based on the temperature and humidity of air obtained according to the detection values of the sensors 61 to 68. Then, the control device 6 drives and controls the flow rate adjusting valves 45 and 46 and the heat pump 5 based on the calculation result. Thereby, the cooling capacity of each cooler coil 41, 42 and the heating capacity of each reheater 43, 44 are changed to adjust the air A2 to a predetermined set temperature (for example, 23 ° C.) and set humidity (for example, 70% RH). doing.

  Specifically, based on the temperature and humidity detected by the temperature sensor 61 and the humidity sensor 62 on the upstream side of the first cooler coil 41, the operating state of the heat pump 5 (the cooling capacity of the first cooler coil 41 and the first reheater 43). Heating capacity) is adjusted. Further, the cooling capacity of the second cooler coil 42 is adjusted based on the temperature and humidity detected by the temperature sensor 63 and the humidity sensor 64 on the downstream side of the first cooler coil 41. Further, the heating capacity of the second reheater 44 is adjusted based on the temperature and humidity detected by the temperature sensor 65 and the humidity sensor 66 on the downstream side of the first reheater 43.

  As a feature of the heat pump 5, the heat radiation energy E1 radiated by the condenser 51 and the heat absorption energy E2 absorbed by the evaporator 52 generate substantially the same amount of energy, and the heat load and the heat load become substantially equal (see FIG. 3 (a)). Further, during steady operation of the exhaust gas recycle air-conditioning system 1, the cold energy (cool load) required for cooling the air in the recycle air conditioner 4 and the heat energy (heat load) required for heating the air are substantially equal. For this reason, in the air conditioning system 1, the first cooler coil 41 and the first reheater 43, which use the heat pump 5 as a heat source, are operated in preference to the second cooler coil 42 and the second reheater 44, thereby increasing energy efficiency.

  When the cooling load E20 becomes larger than the heating load E10 of the recycle air conditioner 4 when the air conditioning system 1 is started up (see FIG. 3B), the operation classification of the air conditioning system 1 is as shown in FIG. As shown, the heat pump 5 generates the same amount of heat energy E1 and cold energy E2 as the heat load E10. And the air conditioning system 1 is controlled so that the cold energy E3 which lacks may be supplemented with the 2nd cooler coil 42 by the cold source 32 (auxiliary cold source).

  Conversely, when the heat load E10 of the recycle air conditioner 4 is larger than the cooling load E20, the operation classification of the air conditioning system 1 is to generate the same amount of cooling energy E2 as the cooling load E20 by the heat pump 5, and The heat pump 5 generates the same amount of heat energy E1 as the cold load E20. Then, the air conditioning system 1 is controlled so that the insufficient heat energy E3 is supplemented by the second reheater 44 by the heat source 31 (auxiliary heat source).

  Further, since there is a mechanical energy loss when the heat pump 5 is actually operated, the energy generated by the heat pump 5 is larger at a rate of several percent in the heat radiation energy E1 than in the heat absorption energy E2. Therefore, in the air conditioning system 1 of the present embodiment, in consideration of the energy loss, the heat dissipation energy by the second reheater 44 is controlled to be smaller than the heat absorption energy by the second cooler coil 42.

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

  (1) In the exhaust gas recycle air conditioning system 1 of the present embodiment, in the recycle air conditioner 4, air is cooled and dehumidified by the first cooler coil 41 using the cold water W <b> 2 cooled by the evaporator 52 of the heat pump 5. The Further, the air is warmed by the first reheater 43 using the hot water W <b> 3 heated by the condenser 51 of the heat pump 5. As in the present invention, when the air A4 exhausted from the painting booth 2 is collected in the recycle air conditioner 4 and its temperature and humidity are adjusted, the temperature to be adjusted compared to the case where the external air A0 is air-conditioned. In addition, the amount of deviation from the humidity is small and the required energy is reduced. In this case, the heat absorption energy and the heat radiation energy required for adjusting the temperature and humidity are substantially equal. Therefore, if the heat pump 5 is used to obtain the energy required in the recycle air conditioner 4 as in the present invention, the energy can be used efficiently and the running cost of the air conditioning system 1 can be kept low. .

  (2) In the exhaust gas recycle air-conditioning system 1 of the present embodiment, the second cooler coil 42 is provided on the downstream side of the first cooler coil 41, and the air cannot be sufficiently cooled only by the cold energy of the first cooler coil 41. The second cooler coil 42 can cool the air using the cold water W <b> 1 supplied from the cold heat source 32. Further, a second reheater 44 is provided on the downstream side of the first reheater 43, and when the air cannot be sufficiently warmed only by the heat radiation energy of the first reheater 43, the second reheater 44 supplies the heat from the heat source 31. The air can be warmed using the steam S1.

  (3) In the exhaust gas recycle air-conditioning system 1 according to the present embodiment, the first cooler coil 41 is disposed upstream of the second cooler coil 42, so that the air is efficiently cooled by the first cooler coil 41 using the heat pump 5 as a heat source. can do. Moreover, since the 1st reheater 43 is arrange | positioned in the upstream of the 2nd reheater 44, air can be efficiently warmed with the 1st reheater 43 which uses the heat pump 5 as a heat source.

  (4) In the exhaust gas recycle air-conditioning system 1 of the present embodiment, in the air circulation flow path including the painting booth 2 and the recycle air conditioner 4, the temperature sensors 61, 63, 65, 67 and humidity sensors 62, 64, 66, 68 are arranged, and the temperature and humidity information detected by each sensor 61-68 is acquired by the control device 6. The controller 6 controls the cooling capacity of the cooler coils 41 and 42 and the heating capacity of the reheaters 43 and 44 in the recycle air conditioner 4 based on the temperature and humidity information. Thereby, the air A2 supplied to the painting booth 2 can be adjusted to a temperature and humidity optimum for painting.

  (5) In the exhaust gas recycle air-conditioning system 1 of the present embodiment, the control device 6 controls the heat pump 5 and the flow rate adjustment valve 45 so that the first cooler coil 41 is operated with priority over the second cooler coil 42. In addition, the control device 6 controls the heat pump 5 and the flow rate adjustment valve 46 so that the first reheater 43 is operated with priority over the second reheater 44. In this way, the energy generated by the heat pump 5 can be used without waste by the first cooler coil 41 and the first reheater 43, and the energy efficiency of the air conditioning system 1 can be increased.

  (6) In the exhaust gas recycle air-conditioning system 1 of the present embodiment, the heat dissipation energy by the second reheater 44 is controlled to be smaller than the heat absorption energy by the second cooler coil 42. By controlling in this way, each energy can be adjusted in consideration of the mechanical loss in the heat pump 5, and the problem that the air A2 is heated more than necessary can be avoided.

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

  In the above-described embodiment, the temperature sensor 67 and the humidity sensor 68 are provided in the supply chamber 12 of the painting booth 2 that becomes the confluence of the air A1 and A2 discharged from the air conditioners 3 and 4, and the sensors 67 and 68 are provided. Although the recycle air conditioner 4 is controlled based on the temperature and humidity acquired in (1), it is not limited to this. For example, the temperature sensor 67 and the humidity sensor 68 may be provided at the exit point of the recycle air conditioner 4, and the recycle air conditioner 4 may be controlled based on the temperature and humidity of the air A2 at the exit point.

  In the above embodiment, the heat pump 5 is used as the compression heat separation means, but the heat pump 5 is not limited to this, and a compression heat exchanger used in an air conditioner, a refrigerator, or the like may be used. However, when the heat pump 5 is used as in the above embodiment, substantially the same energy can be generated for the heat radiation energy and the heat absorption energy, so that the energy efficiency can be increased.

  In the above embodiment, the heat source 31 of the second reheater 44 and the cooling heat source 32 of the second cooler coil 42 are shared with the fresh air conditioner 3, but a heat source and a cooling heat source different from the fresh air conditioner 3 are used. They may be provided and used as dedicated heat sources for the second reheater 44 and the second cooler coil 42. In the heat source 31 and the cooling source 32, the steam S1 and the cold water W1 are used as the heat medium, but other gases, liquids, and the like may be used.

  In the above embodiment, the first cooler coil 41 and the second cooler coil are provided as the air cooling means, but the second cooler coil 42 is omitted, and the air cooling means is configured only by the first cooler coil 41. Also good. Moreover, although the 1st reheater 43 and the 2nd reheater 44 were provided as an air heating means, the 2nd reheater 44 may be abbreviate | omitted and an air heating means may be comprised only with the 1st reheater 43. FIG.

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

  (1) In the above-mentioned means 2, the auxiliary cooling heat source and the auxiliary heat source are used for air-conditioning air with the outside air conditioner, and an exhaust gas recycling air conditioning system for a painting booth.

  (2) The coating according to any one of the above means 1 to 6, wherein the compression heat separation means is a heat pump having an evaporator as the heat absorption part and a condenser as the heat dissipation part. Booth exhaust recycling air conditioning system.

  (3) A control method for controlling the exhaust gas recycling air conditioning system of the painting booth according to any one of the above means 1 to 6, wherein the temperature and humidity of the air discharged from the circulating air conditioner are detected, and the detected temperature And controlling the air cooling means and the air heating means so that the temperature and humidity of the air become a preset temperature and humidity based on the humidity and the humidity.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the exhaust gas recycle air-conditioning system of the painting booth of one Embodiment which actualized this invention. The schematic block diagram which shows a heat pump. (A)-(c) is explanatory drawing which shows the heat load of a heat pump, and a cooling-heat load. The schematic block diagram which shows the exhaust-gas-recycling air conditioning system of the conventional painting booth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Exhaust recycle air-conditioning system 2 ... Painting booth 3 ... Fresh air conditioner as an outside air conditioner 4 ... Recycle air conditioner as a circulation air conditioner 5 ... Heat pump as a compression-type heat separation means 6 ... Control as a circulation air conditioner control means Apparatus 31 ... Heat source as auxiliary heat source 32 ... Cold heat source as auxiliary cold heat source 41 ... First cooler coil as main air cooling means 42 ... Second cooler coil as auxiliary air cooling means 43 ... First reheater as main air heating means 44 ... 2nd reheater as sub air heating means 51 ... Condenser as heat dissipation part 52 ... Evaporator as heat absorption part 67 ... Temperature sensor 68 ... Humidity sensor A0, A1, A2, A3, A4 ... Air S1 ... Heat medium Steam as W1, W2 ... Cold water as heat medium W3 ... Hot water as heat medium

Claims (4)

A painting booth for spraying paint on the object to be coated while flowing air-conditioned air in a certain direction;
An outside air conditioner that takes in air from the outside of the painting booth, adjusts the temperature and humidity of the air, and sends the air toward the painting booth;
A circulation air conditioner that collects a part of the air exhausted from the painting booth, adjusts the temperature and humidity of the air, and sends the air toward the painting booth again .
A compression heat separation means having a heat absorption part for cooling the heat medium and a heat radiation part for heating the heat medium;
The circulating air conditioner has air cooling means for cooling and dehumidifying the collected air, and an air heating means arranged on the downstream side of the air cooling means for heating the air dehumidified by the air cooling means,
The air cooling means includes a main air cooling means for cooling air using a heat medium cooled by the heat absorption part of the compression heat separation means,
Said air heating means, viewed contains a primary air heating means to warm the air by using the heat medium heated by the heat radiating portion of the compression type heat isolation means,
The air cooling unit of the outside air conditioner is connected to a cooling heat source by a first supply path for supplying a cooled heat medium, and the air heating unit of the outside air conditioner is for supplying a heated heat medium. Connected to the heat source by a second supply path of
The air cooling means cools the air by using a part of the cooled heat medium that can be supplied via a first flow rate adjusting valve provided on the first supply path. Further including
The air heating means is a sub air heating means for warming the air using a part of the heated heat medium that can be supplied via a second flow rate adjusting valve provided on the second supply path. In addition,
When the cold load is larger than the heat load of the circulating air conditioner, the same amount of heat energy and cold energy as the heat load is generated by the compression heat separation means, and the insufficient cold energy is generated by the sub heat energy. If the heat load of the circulating air conditioner is made larger than the cold load by using air cooling means, the same amount of cold energy as the cold load is generated by the compression heat separating means and is insufficient. An exhaust gas recycling air conditioning system for a painting booth, characterized in that control is performed so as to supplement thermal energy using the auxiliary air heating means . In the air cooling means, the main air cooling means is arranged upstream of the sub air cooling means, and in the air heating means, the main air heating means is arranged upstream of the sub air heating means. The exhaust gas recycling air conditioning system for a painting booth according to claim 1 . In the air circulation flow path including the painting booth and the circulation air conditioner, at the exit point of the circulation air conditioner or a position after the confluence of air discharged from the outside air conditioner and the circulation air conditioner A temperature sensor and a humidity sensor arranged;
Circulation for controlling the air cooling means and the air heating means so that the temperature and humidity of the air become a preset temperature and humidity based on the temperature and humidity information obtained by the temperature sensor and the humidity sensor. The exhaust gas recycling air conditioning system for a painting booth according to claim 1 or 2 , further comprising an air conditioner control means. The circulating air conditioner control means controls the air cooling means to operate the main air cooling means with priority over the auxiliary air cooling means, and gives priority to the main air heating means over the auxiliary air heating means. 4. The exhaust gas recycling air conditioning system for a painting booth according to claim 3 , wherein the air heating means is controlled to operate.

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