Control method of air-conditioning system

Abstract

To provide a control method of an air-conditioning system capable of suppressing risk of delay of operation start of a coating step.SOLUTION: A control method of an air-conditioning system 10 adjusts air of a first coating booth B1 and a second coating booth B2. The air-conditioning system 10 includes a first air-conditioner 1, and a second air-conditioner 2. The first air-conditioner 1 is supplied with at least air discharged from the first coating booth B1, heats or cools the supplied air, and delivers the heated or cooled air to the first coating booth B1. The second air conditioner 2 is supplied with outside air or the air discharged from the second coating booth B2, heats or adjusts the temperature / humidity of the supplied outside air or air discharged from the second coating booth B2, and delivers the air to the second coating booth B2. The control method includes a step of determining whether at least one of a temperature T1 of a skeleton of the first coating booth B1 and a temperature T2 of a skeleton of the second coating booth B2 is lower than a predetermined value.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for controlling an air conditioning system. [Background technology]

[0002] The air conditioning control device disclosed in Patent Document 1 includes a recycle air conditioner and a fresh air conditioner. The fresh air conditioner circulates conditioned air, which has been adjusted in temperature and humidity from outside air, into a coating room. The recycle air conditioner circulates reconditioned air, which has been adjusted in temperature and humidity from exhaust air discharged from the coating room, into another coating room. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-046600 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have discovered the following technical problems. Depending on the season or before operation, the ambient temperature in the paint room may be low. In such cases, the temperature of the exhaust air discharged from the paint room is also low. When the fresh air conditioning unit adjusts the temperature and humidity of the outside air and circulates it in the paint room, the temperature of the paint room's building blocks is low and condensation may occur inside the paint room. In the case of a recycling air conditioning unit that does not have a heating function, it is not possible to quickly raise the temperature of the paint room's building blocks, which may delay the start of the paint process.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and provides a method for controlling an air conditioning system that can reduce the risk of delays in starting a painting process. [Means for solving the problem]

[0006] The method for controlling an air conditioning system according to the present disclosure includes: A method for controlling an air conditioning system that adjusts air in a first paint booth and a second paint booth, comprising: The air conditioning system includes a first air conditioner and a second air conditioner, the first air conditioner is supplied with at least air discharged from the first paint booth, and heats or cools the supplied air and sends it to the first paint booth; the second air conditioner is supplied with outside air or air discharged from the second paint booth, and heats or adjusts the temperature and humidity of the supplied outside air or the air discharged from the second paint booth, and sends the air to the second paint booth; determining whether at least one of a temperature of a building structure of the first paint booth and a temperature of a building structure of the second paint booth is below a predetermined value; When it is determined that at least one of the temperature of the structure of the first paint booth and the temperature of the structure of the second paint booth falls below a predetermined value, the supply of outside air to the second air conditioner is stopped while supplying air discharged from the second paint booth to the second air conditioner.

[0007] In the above-mentioned air conditioning system control method, When it is determined that the temperature of the structure of the first paint booth and the temperature of the structure of the second paint booth do not fall below a predetermined value, the method preferably includes a step of starting the supply of outside air to the second air conditioner while switching the supply destination of the air discharged from the second paint booth from the second air conditioner to the first air conditioner.

[0008] In the above-described method for controlling an air conditioning system, it is preferable that the second air conditioner uses at least one of a heat pump facility, a boiler facility, a refrigerator, and a cooling tower as a heat supply source. Effect of the Invention

[0009] According to the present disclosure, the risk of delays in starting the painting process can be reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a configuration example of an air conditioning system according to a first embodiment. [Diagram 2] 4 is a flowchart showing a control method for the air conditioning system according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings are appropriately simplified for clarity of explanation.

[0012] <Embodiment 1> The first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of the configuration of an air conditioning system according to the first embodiment.

[0013] 1, the air conditioning system 10 includes a first air conditioner 1 and a second air conditioner 2. The air conditioning system 10 conditions the air in a first painting booth B1 and a second painting booth B2. The air conditioning system 10 may include exhaust fans 31, 32, a first damper 41, a second damper 42, a third damper 43, a hot heat supply source 5, a cold heat supply source 6, a temperature sensor 7, and a control device 8.

[0014] The components of the air conditioning system 10 are connected to each other via flow paths F11, F12, F21, F21A, F22, F3, and F4. Specifically, the first air conditioner 1 and the first painting booth B1 are connected to each other via flow paths F11 and F12 so that air can circulate. The flow path F11A branches off from the middle of the flow path F11 and extends to an exhaust port (not shown). The second air conditioner 2 and the second painting booth B2 are connected to each other via flow paths F21 and F22 so that air can circulate. The flow path F21A branches off from the middle of the flow path F21 and merges with the flow path F11, or may be connected to the first air conditioner 1 so as to merge with the flow path F11 inside the first air conditioner 1. The first air conditioner 1 and the second painting booth B2 are connected to each other via the flow paths F21, F21A, and F11. The second painting booth B2 allows air to pass through flow paths F21, F21A, and F11 and be discharged to the first air conditioner 1. The hot heat supply source 5 is connected to the first air conditioner 1 and the second air conditioner 2 via a flow path F3. The cold heat supply source 6 is connected to the first air conditioner 1 and the second air conditioner 2 via a flow path F4.

[0015] The first air conditioner 1 has a heat exchanger 1a and a blower 1b. The heat exchanger 1a is, for example, a heat exchanger that heats or cools the air in the first air conditioner 1 as appropriate. An example of a heat exchanger is a hot and cold water coil. Hot water is supplied to the heat exchanger 1a from the hot heat supply source 5 through a flow path F3. The heat exchanger 1a may heat the air in the first air conditioner 1 using this hot water. In addition, cold water may be supplied to the heat exchanger 1a from the cold heat supply source 6 through a flow path F4. The heat exchanger 1a may cool the air in the first air conditioner 1 using the supplied cold water. The blower 1b sends the air in the first air conditioner 1 through a flow path F12 to the first paint booth B1. The first air conditioner 1 may be configured using, for example, a commercially available recycling air conditioner.

[0016] The first air conditioner 1 mainly conditions the air in the first paint booth B1. In the first paint booth B1, a painting process can be carried out. In an example of the first paint booth B1 shown in FIG. 1, an unmanned painting process can be carried out. The first paint booth B1 may be, for example, a dry booth.

[0017] The second air conditioner 2 includes a heating section 2a, a cooling section 2b, an outside air intake 2c, a blower 2d, and a humidifying section 2e. The heating section 2a heats the air in the second air conditioner 2. The heating section 2a is, for example, a hot water coil. The heating section 2a is supplied with hot water from a hot heat supply source 5 through a flow path F3. The heating section 2a may use this hot water to heat the air in the second air conditioner 2. The cooling section 2b cools the air in the second air conditioner 2. The cooling section 2b is, for example, a cold water coil. The cooling section 2b is supplied with cold water from a cold heat supply source 6 through a flow path F4. The cooling section 2b may use this cold water to cool the air in the second air conditioner 2. The outside air intake 2c is an opening that takes in outside air from the outside to the inside of the second air conditioner 2. The blower 2d sends the air in the second air conditioner 2 through the flow path F22 to the second painting booth B2. The humidifying section 2e may use a humidifying spray or the like to humidify the air in the second air conditioner 2. The second air conditioner 2 may use at least one of a heat pump system, a boiler system, a refrigerator, and a cooling tower as a heat supply source. However, a direct heating type gas burner system is not used for the heating section 2a. The second air conditioner 2 may be configured using, for example, a commercially available fresh air conditioner.

[0018] The second air conditioner 2 mainly conditions the air in the second paint booth B2. The second paint booth B2 is a space where a painting process can be carried out. In an example of the second paint booth B2 shown in FIG. 1, a painting process can be carried out by a person. The second paint booth B2 may be, for example, a dry booth.

[0019] The exhaust fan 31 is disposed on the flow path F11. The exhaust fan 31 sends a portion of the air discharged from the first painting booth B1 to the first air conditioner 1 through the flow path F11, and exhausts the remaining portion through the flow path F11 and the flow path F11A. The exhaust fan 32 is disposed on the flow path F12. The exhaust fan 32 sends the air discharged from the second painting booth B2 to the second air conditioner 2 through the flow path F12.

[0020] The first damper 41, the second damper 42, and the third damper 43 are flow control valves. The first damper 41 is disposed on the flow path F21A. The first damper 41 receives a command signal from the control device 8 to close or open the flow path F21A. The second damper 42 is disposed on the flow path F21. The second damper 42 receives a command signal from the control device 8 to close or open the flow path F21. The third damper 43 is disposed at the outside air intake 2c of the second air conditioner 2. The third damper 43 receives a command signal from the control device 8 to close or open the outside air intake 2c.

[0021] The hot heat supply source 5 can supply hot water through the flow path F3 to each of the first air conditioner 1 and the second air conditioner 2. The hot heat supply source 5 may be configured using, for example, a heat pump facility or a boiler facility.

[0022] The cold heat supply source 6 can supply cold water through a flow path F4 to each of the first air conditioner 1 and the second air conditioner 2. The cold heat supply source 6 may be configured using, for example, a heat pump facility, a refrigerator, a cooling tower, or the like.

[0023] The temperature sensor 7 detects the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 every moment. The building frame of the first painting booth B1 is, for example, the inner wall of the first painting booth B1. The building frame of the second painting booth B2 is, for example, the inner wall of the second painting booth B2.

[0024] The control device 8 may be configured using a general computer device. The control device 8 may be connected to each component of the air conditioning system 10 so as to be able to exchange various signals. Specifically, the control device 8 acquires signals indicating the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 from the temperature sensor 7. The control device 8 sends a signal to the first damper 41 to close or open the flow path F21A. The control device 8 sends a signal to the second damper 42 to close or open the flow path F21. The control device 8 sends a signal to the third damper 43 to close or open the outside air intake 2c.

[0025] <Control method> Next, a method for controlling the air conditioning system 10 will be described with reference to Fig. 2. Fig. 2 is a flowchart showing a method for controlling the air conditioning system according to the first embodiment.

[0026] The first air conditioner 1 and the second air conditioner 2 are started (step ST1). The control device 8 determines whether or not the temperature T1 of the building blocks of the first painting booth B1 and the temperature T2 of the building blocks of the second painting booth B2 are below the condensation temperature Tb (step ST2). The condensation temperature Tb is a predetermined value. The condensation temperature Tb may be a value at which condensation occurs or may occur in the second painting booth B2 when the second air conditioner 2 operates under mass production conditions after step ST3 described below.

[0027] When the controller 8 determines that at least one of the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 is below the condensation occurrence temperature Tb (step ST2: YES), the second air conditioner 2 starts operating under condensation prevention conditions (step ST21). The second air conditioner 2 may perform only heating control without performing humidification control.

[0028] Next, the heat exchanger 1a of the first air conditioner 1 heats the air (step ST22). If the heat exchanger 1a is a hot / cold water coil, the hot / cold water coil heats the air in the first air conditioner 1 using hot water supplied from the hot heat supply source 5 through the flow path F3.

[0029] Next, the second damper 42 opens the flow path F21 (step ST23). The first damper 41 closes the flow path F21A (step ST24). The air discharged from the second painting booth B2 passes through the flow path F21 and flows into the second air conditioner 2. That is, the second air conditioner 2 obtains the air discharged from the second painting booth B2.

[0030] Next, the third damper 43 closes the outside air intake 2c (step ST25). The outside air cannot pass through the outside air intake 2c and therefore cannot flow into the second air conditioner 2. That is, the second air conditioner 2 stops taking in the outside air. In other words, in steps ST23 to ST25, the supply of outside air to the second air conditioner 2 is stopped, while the air discharged from the second painting booth B2 is supplied to the second air conditioner 2.

[0031] The state in which steps ST21 to ST25 have been performed is maintained until the control device 8 determines that the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 are not below the condensation temperature Tb (step ST2: YES). Specifically, if the temperatures T1 and T2 are equal to or higher than the condensation temperature Tb, it is determined that the temperatures T1 and T2 are not below the condensation temperature Tb. The first air conditioner 1 also acquires air discharged from the first painting booth B1. The heat exchanger 1a heats the air acquired by the first air conditioner 1. That is, the first air conditioner 1 sends the air heated by the heat exchanger 1a to the first painting booth B1. The supply air volume and exhaust air volume of the first air conditioner 1 become equal, and the air circulates through the first air conditioner 1 and the first painting booth B1. This circulation can improve the temperature T1 of the building blocks of the first painting booth B1. Meanwhile, the second air conditioner 2 acquires and heats the air discharged from the second painting booth B2 while stopping the acquisition of outside air. The second air conditioner 2 sends this heated air to the second painting booth B2. In other words, the air discharged from the second painting booth B2 circulates through the second air conditioner 2 and the second painting booth B2. The temperature of the air circulating through the second air conditioner 2 and the second painting booth B2 tends to be higher than the temperature of the outside air. Therefore, the temperature T2 of the building blocks of the second painting booth B2 can be improved quickly.

[0032] On the other hand, if the control device 8 determines that the temperature T1 of the structure of the first painting booth B1 and the temperature T2 of the structure of the second painting booth B2 are above the condensation temperature Tb, that is, do not fall below the condensation temperature Tb (step ST2: NO), the second air conditioner 2 starts operating under mass production conditions (step ST3).

[0033] Next, the third damper 43 opens the outside air intake 2c (step ST4). The outside air passes through the outside air intake 2c and flows into the second air conditioner 2. That is, the second air conditioner 2 starts taking in the outside air.

[0034] Next, the first damper 41 opens the flow path F21A (step ST5). Next, the second damper 42 closes the flow path F21 (step ST6). The air discharged from the first painting booth B1 passes through the flow paths F21A and F11 and flows into the first air conditioner 1. That is, the first air conditioner 1 acquires the air discharged from the first painting booth B1. In other words, in steps ST4 to ST6, the supply of outside air to the second air conditioner 2 is started, and the supply destination of the air discharged from the second painting booth B2 is switched from the second air conditioner 2 to the first air conditioner 1.

[0035] Next, the first air conditioner 1 cools the air (step ST7). When the heat exchanger 1a is a hot / cold water coil, the hot / cold water coil cools the air in the first air conditioner 1 using cold water supplied from the cold heat supply source 6 through a flow path F4. The amount of cooling may be determined according to the amount of heat generated by the first air conditioner 1 due to exhaust gas recycling.

[0036] Finally, the first air conditioner 1 and the second air conditioner 2 operate under mass production conditions (step ST8). Specifically, the first air conditioner 1 acquires air discharged from the first paint booth B1 and the second paint booth B2. The heat exchanger 1a cools the air discharged from the first paint booth B1 and the second paint booth B2. The first air conditioner 1 sends the air cooled by the heat exchanger 1a to the first paint booth B1. The first air conditioner 1 adjusts the air conditioning of the first paint booth B1 to match the mass production conditions. Meanwhile, the second air conditioner 2 stops acquiring air discharged from the second paint booth B2 and acquires outside air, adjusts the temperature and humidity, and then sends it to the second paint booth B2. The second air conditioner 2 adjusts the air conditioning of the second paint booth B2 to match the mass production conditions. With these features, a worker can carry out the painting process in the second painting booth B2, and an unmanned painting process can be carried out in the first painting booth B1.

[0037] As described above, according to the control method of the air conditioning system 10, when at least one of the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 falls below the condensation occurrence temperature Tb, the condensation prevention operation is performed. Specifically, the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 are increased until the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 reach the condensation occurrence temperature Tb or higher, so that the occurrence of condensation can be avoided and the painting process can be started early. In other words, the possibility of delaying the start of the painting process can be suppressed. The control method of the air conditioning system 10 is suitable when the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 are low, for example, in winter or before operation.

[0038] According to the above-mentioned control method for the air conditioning system 10, when the temperature T1 of the building frame of the first painting booth B1 and the temperature T2 of the building frame of the second painting booth B2 are equal to or higher than the condensation temperature Tb, the first air conditioner 1 and the second air conditioner 2 operate according to the mass production conditions without performing the condensation prevention operation. As a result, the painting process can be performed by an operator in the second painting booth B2, and the painting process can be performed unmanned in the first painting booth B1.

[0039] The control device 8 in the above-described embodiment is configured by hardware or software, or both, and may be configured by one piece of hardware or software, or may be configured by multiple pieces of hardware or software. The functions (processing) of each device may be realized by a computer having a CPU (Central Processing Unit), memory, etc. For example, a program for performing the method in the embodiment (e.g., a control method) may be stored in a storage device, and each function may be realized by executing the program stored in the storage device by the CPU.

[0040] These programs can be stored and provided to a computer using various types of non-transitory computer readable media. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROM (Read Only Memory), CD-R, CD-R / W, and semiconductor memory (e.g., mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The programs may also be provided to a computer by various types of transitory computer readable media. Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. The transitory computer readable media can provide the programs to a computer via a wired communication path such as an electric wire and an optical fiber, or via a wireless communication path.

[0041] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. In addition, the present invention may be implemented by appropriately combining the above-described embodiment and examples thereof. [Explanation of symbols]

[0042] 10. Air Conditioning System 1. First air conditioner 1a Heat exchange section 1b blower 2. Second air conditioner 2a Heating section 2b Cooling section 2c Outside air intake 2d blower 2e Humidifying section 31, 32 Exhaust fan 41 First Damper 42 Second Damper 43 The Third Damper 5. Heat Source 6 Cooling source 7 Temperature Sensor 8 Control device F11, F11A, F12, F21, F21A, F22, F3, F4 flow paths B1 First Paint Booth B2 Second Paint Booth

Claims

1. A method for controlling an air conditioning system that adjusts air in a first paint booth and a second paint booth, comprising: The air conditioning system includes a first air conditioner and a second air conditioner, the first air conditioner is supplied with at least air discharged from the first paint booth, and heats or cools the supplied air and sends it to the first paint booth; the second air conditioner is supplied with outside air or air discharged from the second paint booth, and heats or adjusts the temperature and humidity of the supplied outside air or the air discharged from the second paint booth, and sends the air to the second paint booth; determining whether at least one of a temperature of a structure of the first paint booth and a temperature of a structure of the second paint booth is below a predetermined value; and when it is determined that at least one of the temperature of the structure of the first paint booth and the temperature of the structure of the second paint booth is lower than a predetermined value, stopping the supply of outside air to the second air conditioner while supplying air discharged from the second paint booth to the second air conditioner. A method for controlling an air conditioning system.

2. and when it is determined that the temperature of the structure of the first paint booth and the temperature of the structure of the second paint booth are not below a predetermined value, switching a supply destination of the air discharged from the second paint booth from the second air conditioner to the first air conditioner while starting a supply of outside air to the second air conditioner. A method for controlling an air conditioning system according to claim 1.

3. The first air conditioner and the second air conditioner use at least one of a heat pump facility, a boiler facility, a refrigerator, and a cooling tower as a heat supply source. A method for controlling an air conditioning system according to claim 1 or 2.

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